WO2018117144A1

WO2018117144A1 - Field-winding type rotating electric machine

Info

Publication number: WO2018117144A1
Application number: PCT/JP2017/045685
Authority: WO
Inventors: 瀬口　正弘; 純一中園
Original assignee: 株式会社デンソー
Priority date: 2016-12-21
Filing date: 2017-12-20
Publication date: 2018-06-28

Abstract

Provided is a field-winding type rotating electric machine comprising: a stator armature winding that is wound around a stator core; a rotor field winding that is wound around a rotor core; a rectifier element that is connected to both ends of the rotor field winding; a capacitor, one end of which is connected to one end of the rectifier element and the other end of which is connected between the ends of the rotor field winding; and a control circuit that induces an excitation current in the rotor field winding by generating a current on which a fundamental wave component for generating a rotation torque in the stator armature winding and a higher harmonic component having a shorter period than the fundamental wave component are superimposed. The inductance of the rotor field winding and the capacity of the capacitor are in a resonance relationship with the frequency of the higher harmonic component.

Description

Field winding type rotating electrical machine

The present invention relates to a field winding type rotating electrical machine.

Conventionally, a field winding type rotating electrical machine that generates a magnetic field by energizing a stator armature winding is known (for example, Patent Documents 1 and 2). The field winding type rotary electric machine includes a stator and a rotor. The stator has a stator core and a stator armature winding wound around the stator core. The rotor has a rotor core and a rotor field winding wound around the rotor core. The rotor field winding is short-circuited via a diode that is a rectifying element. That is, diodes are connected to both ends of the rotor field winding.

The field winding type rotating electrical machine includes an inverter circuit connected to the stator armature winding and a control circuit for controlling the inverter circuit so that a current corresponding to the rotational position of the rotor flows in the stator armature winding. And. The current flowing through the stator armature winding is the sum of a fundamental wave current (that is, a synchronous current) that is a current component for generating rotational torque and an excitation current that is a current component for rotor excitation. The exciting current for exciting the rotor is a harmonic current having a shorter cycle (that is, a higher frequency) than the fundamental current, and is formed into a pulse-like waveform. When the exciting current for exciting the rotor flows in the stator armature winding, the exciting magnetic flux is linked to the main magnetic pole of the rotor core, and a voltage is generated in the rotor field winding to induce the exciting current.

As described above, diodes are connected to both ends of the rotor field winding. For this reason, even if the excitation magnetic flux fluctuates and an AC voltage is generated in the rotor field winding, current flows in the rotor field winding only in one direction, so that the rotor core is excited in a predetermined direction and the field pole (Specifically, N pole and S pole) are formed. The field flux for forming the field pole is formed by energizing the stator armature winding with an exciting current for exciting the rotor and rectifying the current in the rotor field winding.

Thus, in a rotating electrical machine that forms a field pole by receiving excitation magnetic flux from a stator by a rotor field winding and converting it to a unidirectional current via a diode, in order to generate rotational torque, The rotor core is excited by interlinking excitation magnetic flux with the main pole. This excitation of the rotor core is realized by superimposing a pulsed excitation current on the fundamental wave current to induce the excitation current in the rotor field winding.

JP 2008-178211 A JP 2007-185082 A

The rotor field winding has inductance, and each portion of the rotor field winding at each pole constitutes a partial inductance. Magnetic flux flowing in the field pole includes leakage magnetic flux and harmonic magnetic flux. If the impedance at the time of excitation of the rotor field winding is high, it becomes difficult for a current to flow through the rotor field winding. When current is difficult to flow, in order to induce the excitation current appropriately in the rotor field winding, it is necessary to increase the amplitude of the harmonic component for exciting the rotor by the amount that the current does not flow easily. For this reason, the torque ripple is increased due to the harmonic component.

The present invention has been made in view of the above problems, and by reducing the impedance at the time of excitation of the rotor field winding, it is possible to reduce a field ripple that can reduce torque ripple caused by harmonic components. It aims at providing a winding type rotary electric machine.

A field winding type rotating electrical machine according to the present disclosure is connected to a stator armature winding wound around a stator core, a rotor field winding wound around a rotor core, and both ends of the rotor field winding. A rectifying element, a capacitor having one end connected to one end of the rectifying element and the other end connected between both ends of the rotor field winding, and a basis for generating rotational torque in the stator armature winding A control circuit for inducing an excitation current in the rotor field winding by flowing a current in which a wave component and a harmonic component having a period shorter than that of the fundamental wave component are passed. The inductance of the winding and the capacitance of the capacitor are in a resonance relationship with the frequency of the harmonic component.

According to the above configuration, when a current in which the fundamental wave component and the harmonic component are superimposed on the stator armature winding flows, the field current induced in the rotor field winding easily flows. Therefore, since the impedance at the time of exciting the rotor field winding can be reduced, torque ripple caused by the harmonic component for exciting the rotor can be reduced.

In the field winding type rotating electrical machine described above, the amplitude of the harmonic component is adjusted by using a standing wave having a half cycle with respect to the fundamental component as an envelope. According to this configuration, it is possible to control the excitation current amount for exciting the rotor field winding by adjusting the amplitude of the harmonic component superimposed on the fundamental wave component using the standing wave as an envelope, so that the excitation current can be controlled. It is easy to control the amount of current.

In the field winding type rotating electrical machine described above, the rotor field winding includes a first field winding portion connected between the other end of the capacitor and the other end of the rectifying element, and the capacitor. A second field winding portion connected in parallel, a first resonance frequency based on an inductance of the first field winding portion and a capacitance of the capacitor, and the second field winding. At least one of the second resonance frequency based on the inductance of the part and the capacitance of the capacitor is within a predetermined frequency range including the frequency of the harmonic component, or the frequency of the harmonic component is the first resonance frequency. Between the second resonance frequency.

According to the above configuration, when the current in which the fundamental wave component and the harmonic component are superimposed flows in the stator armature winding, the first field winding portion or the second field winding of the rotor field winding. The field current induced in the line portion is easy to flow. Therefore, the impedance during excitation of the rotor field winding can be reduced, and the excitation performance of the rotor field winding can be improved.

In the above field winding type rotating electrical machine, the rotor field winding has a plurality of field winding portions connected in series, and each of the capacitors has one end connected to one end of the rectifying element, A plurality of resonance circuits having a plurality of capacitor portions whose ends are connected to corresponding ones of connection points of the field winding portions, and a plurality of the field winding portions and the plurality of capacitor portions. And at least one of the resonance frequencies of the resonance circuit is within a predetermined frequency range including the frequency of the harmonic component, or the frequency of the harmonic component is any two of the two It is between the resonant frequencies of the resonant circuit. According to this configuration, since a plurality of resonance frequencies can be provided, the harmonic component can be easily adjusted to the resonance frequency of the resonance circuit, or the harmonic component can be easily adjusted between any two resonance frequencies. Therefore, it is possible to easily flow the field current induced in the field winding portion of the rotor field winding.

In the above-described field winding type rotary electric machine, the resonance frequencies of the resonance circuits are different from each other. According to this configuration, since the resonance frequency of each resonance circuit can be expanded over a band having a width, it is easy to match the harmonic component to the resonance frequency of the resonance circuit or between any two resonance frequencies. Accordingly, it is possible to easily flow the field current induced in the field winding portion of the rotor field winding.

In the field winding type rotating electrical machine, the frequency of the harmonic component superimposed on the fundamental wave component is a resonance frequency based on the inductance of the rotor field winding and the capacitance of the capacitor from low to high rotation. Is within a predetermined frequency range. According to this configuration, the harmonic component having a frequency close to the resonance frequency can be superimposed on the fundamental wave component regardless of the frequency of the fundamental wave component from the low rotation to the high rotation of the field winding type rotary electric machine. Impeding property of the rotor field winding can be improved by reducing the impedance at the time of excitation of the field winding. Further, since the amplitude of the harmonic component can be suppressed from the low rotation to the high rotation of the field winding type rotary electric machine, the torque ripple caused by the harmonic component for rotor excitation can be reduced.

In the above field winding type rotating electrical machine, the predetermined frequency range is a range in which an excitation current or torque induced in the rotor field winding is a predetermined value or more. According to this configuration, it is possible to increase the excitation current or torque induced in the rotor field winding while increasing the excitation property of the rotor field winding by generating the harmonic component.

In the field winding type rotary electric machine, the stator armature winding is composed of a three-phase winding, and the control circuit induces an excitation current in the rotor field winding in a rectangular wave control region. Thus, one of the other two phases is wound at a timing delayed by an electrical angle of 30 ° to 60 ° from the center of the ON period of the rectangular wave voltage waveform for generating the fundamental wave component applied to one phase winding. A first negative voltage pulse for turning off for a predetermined period is added to an on period of the rectangular wave voltage waveform for generating the fundamental wave component applied to the line, and applied to the other phase winding of the other two phases. A first positive voltage pulse for turning on only for a predetermined period paired with the first negative voltage pulse is added to an off period of the rectangular wave voltage waveform for generating the fundamental wave component, or one phase winding The rectangular wave voltage waveform for generating the fundamental wave component applied to the At a timing delayed by an electrical angle of 30 ° to 60 ° from the center of the off period, the rectangular wave voltage waveform for generating the fundamental wave component applied to one of the other two phases is turned off for a predetermined period of time. The second positive voltage pulse for turning on is applied, and the second positive voltage pulse is applied during the on period of the rectangular wave voltage waveform for generating the fundamental wave component applied to the other phase winding of the other two phases. A second negative voltage pulse for turning off for a predetermined period of time is added. According to this configuration, a set of positive and negative voltage pulse pairs can be applied to adjacent two-phase windings, and one harmonic component can be generated during one control period.

In the field winding type rotating electric machine, the control circuit adds the first negative voltage pulse and the first positive voltage pulse with reference to one phase winding, and the second positive voltage pulse and the second positive voltage pulse. By performing both additions of negative voltage pulses with reference to the other two-phase phase windings, excitation by the rotor field winding is performed six times at regular intervals per control period, or one One of the addition of the first negative voltage pulse and the first positive voltage pulse and the addition of the second positive voltage pulse and the second negative voltage pulse with reference to the phase winding of the other two-phase phase By performing also when the winding is used as a reference, excitation by the rotor field winding is performed three times at regular intervals per control cycle. According to this configuration, since a harmonic component can be generated six or three times at regular intervals during one control period, a harmonic component having a frequency close to the resonance frequency is superimposed on the fundamental component in a predetermined rotation range. can do.

In the field winding type rotary electric machine, the stator armature winding is composed of a three-phase winding, and the control circuit induces an excitation current in the rotor field winding in a rectangular wave control region. Then, a first negative voltage pulse for turning off for a predetermined period is added to the beginning of the on period of the rectangular wave voltage waveform for generating the fundamental wave component applied to one phase winding, and any one of the other Adding a first positive voltage pulse for turning on for a predetermined period paired with the first negative voltage pulse in an off period of the rectangular wave voltage waveform for generating the fundamental wave component applied to the phase winding of Adding a second positive voltage pulse for adding the ON period for a predetermined period to the end of the ON period of the rectangular wave voltage waveform for generating the fundamental wave component applied to one phase winding, and any other Generation of the fundamental component applied to one phase winding Performing a first harmonic generation process that adds a second negative voltage pulse for only off a predetermined period of time during the ON period of the rectangular wave voltage waveforms constituting the second positive voltage pulse and the pair for. According to this configuration, a pair of positive and negative voltage pulse pairs can be applied to adjacent two-phase windings, and two harmonic components can be generated during one control period.

In the above field winding type rotating electrical machine, the control circuit performs the first harmonic generation process at the timing of both the start and end of the on period of the rectangular wave voltage waveform for each of the three phase windings. The excitation by the rotor field winding is performed 6 times at regular intervals per control cycle. According to this configuration, since a harmonic component can be generated six times at regular intervals during one control period, a harmonic component having a frequency close to the resonance frequency can be superimposed on the fundamental component in a predetermined rotation range. it can.

In the above field winding type rotating electrical machine, the control circuit performs the first harmonic generation process at the timing of either the start end or the end of the on-period of the rectangular wave voltage waveform for each of the three phase windings. Thus, excitation by the rotor field winding is performed three times at regular intervals per control period. According to this configuration, since a harmonic component can be generated three times at regular intervals during one control period, generation of a harmonic component per control period that can generate a harmonic component having a frequency close to the resonance frequency is possible. A harmonic component having a frequency close to the resonance frequency can be superimposed on the fundamental wave component in a rotation range higher than the rotation range when the number of times is six.

In the field winding type rotating electrical machine, the control circuit induces an excitation current in the rotor field winding in a rectangular wave control region and applies the two phase windings adjacent to each other in the circumferential direction. The positive and negative voltage pulse pairs are added to the rectangular wave voltage waveform for generating the fundamental wave component four times at equal intervals per control cycle, and the average value of the applied voltage per one phase and one control cycle is set to zero. According to this configuration, since a harmonic component can be generated four times at regular intervals during one control cycle, a harmonic component can be generated per control cycle that can generate a harmonic component having a frequency close to the resonance frequency. A harmonic component having a frequency closer to the resonance frequency can be superimposed on the fundamental wave component in a rotation range between the rotation range when the number of times is six and the rotation range when the number is three.

In the field winding type rotating electrical machine, the control circuit performs the first harmonic generation processing at a timing of both a start end and a termination of a rectangular wave voltage waveform with a predetermined phase winding, and the predetermined phase winding. The rectangular wave voltage waveform for generating the fundamental wave component applied to the two phase windings adjacent to each other in the circumferential direction at a timing separated by an electrical angle of 90 ° from the respective timings of the start and end of the rectangular wave voltage waveform in the line By performing a second harmonic generation process for adding a positive / negative voltage pulse pair to the rotor, excitation by the rotor field winding is performed four times at regular intervals per control period. According to this configuration, harmonic components can be generated four times at regular intervals during one control period.

In the above field winding type rotating electrical machine, the additional frequency of the voltage pulse by the control circuit is within the predetermined frequency range. According to this configuration, by adding a voltage pulse, a harmonic component having a frequency close to the resonance frequency is superimposed on the fundamental wave component regardless of the frequency of the fundamental wave component from low rotation to high rotation of the field winding type rotating electrical machine. be able to.

1 is a circuit diagram of a system including a field winding type rotating electrical machine according to a first embodiment of the present invention. It is a block diagram of the field winding type rotary electric machine of 1st Embodiment. It is sectional drawing at the time of cut | disconnecting the field winding type rotary electric machine of 1st Embodiment in the surface which spreads in the orthogonal | vertical direction with respect to a rotating shaft. FIG. 6 is a waveform diagram illustrating an example of a time change of each of a phase current flowing through each phase of a stator armature winding, an exciting current for exciting a rotor, and generated torque in the field winding type rotary electric machine according to the first embodiment. The phase current of one phase of the stator armature winding in the field winding type rotary electric machine of the first embodiment, the fundamental wave component constituting the phase current, and the harmonic component for exciting the rotor constituting the phase current, respectively. It is a wave form diagram showing the time change of one mode. The phase current of one phase of the stator armature winding in the field winding type rotary electric machine of the first embodiment, the fundamental wave component constituting the phase current, and the harmonic component for exciting the rotor constituting the phase current, respectively. It is a wave form diagram showing the time change of another mode. It is a figure showing the relationship between the voltage direction of a rotor field winding, the total voltage, generated current, and current conversion efficiency in the field winding type rotary electric machine of 1st Embodiment. It is a principal part circuit diagram containing the rotor field winding of the field winding type rotary electric machine of 1st Embodiment. It is a figure for demonstrating that a capacitor | condenser is charged in the direction where the voltage which generate | occur | produces in each field winding part of a rotor field winding mutually cancels in the field winding type rotary electric machine of 1st Embodiment. It is a figure for demonstrating that a capacitor | condenser is discharged in the direction where the voltage which generate | occur | produces in each field winding part of a rotor field winding mutually cancels in the field winding type rotary electric machine of 1st Embodiment. It is a figure showing generation | occurrence | production of the magnetic field produced between a stator and a rotor, when the electric current which flows into the phase winding of V phase in the field winding type rotary electric machine of 1st Embodiment is the maximum. In the field winding type rotary electric machine according to the first embodiment, when the rotor has a four-pole pair, the period of the fundamental wave component flowing through the stator armature winding and the target pulse number of the harmonic component for each rotation speed FIG. 4 is a diagram illustrating the number of actual pulses and a deviation rate at which the actual frequency of the harmonic component is shifted from the resonance frequency. It is a figure showing the relationship between the rotation speed and deviation rate in FIG. It is a figure showing the relationship between the frequency of the harmonic component in the resonance frequency vicinity of a field winding type rotary electric machine, and the excitation current and torque which are obtained. It is a figure showing the combination of two adjacent phases which apply a positive / negative voltage pulse pair in order to generate a harmonic component in the field winding type rotary electric machine of 1st Embodiment, and its application timing (rotor position). It is a figure showing each phase voltage waveform in the case of producing | generating a harmonic component 6 times per control period (electrical angle 360 degrees) in the field winding type rotary electric machine of 1st Embodiment. In the field winding type rotary electric machine that is a modified form of the first embodiment, the period of the fundamental wave component that flows through the stator armature winding and the harmonic component for each rotation speed when the rotor is a quadrupole pair. It is a figure showing the number of target pulses, the number of real pulses, and the deviation rate from which the real frequency of a harmonic component shifts to the resonance frequency. It is a figure showing the relationship between the rotation speed and deviation rate in FIG. It is a figure showing each phase voltage waveform in the case of producing | generating a harmonic component 4 times per control period in the field winding type rotary electric machine of the above-described modification of 1st Embodiment. It is a principal part circuit diagram containing the rotor field winding of the field winding type rotary electric machine which concerns on 2nd Embodiment of this invention. It is sectional drawing at the time of cut | disconnecting the field winding type rotary electric machine of 2nd Embodiment in the surface which spreads in the orthogonal | vertical direction with respect to a rotating shaft. It is a principal part circuit diagram containing the rotor field winding of the field winding type rotary electric machine which concerns on 3rd Embodiment of this invention. It is sectional drawing at the time of cut | disconnecting the field winding type rotary electric machine which concerns on the 1st modification of this invention in the surface which spreads in the orthogonal | vertical direction with respect to a rotating shaft. It is sectional drawing at the time of cut | disconnecting the field winding type rotary electric machine which concerns on the 2nd modification of this invention in the surface which spreads in the orthogonal | vertical direction with respect to a rotating shaft. It is sectional drawing at the time of cut | disconnecting the field winding type rotary electric machine which concerns on the 3rd modification of this invention in the surface which spreads in the orthogonal | vertical direction with respect to a rotating shaft. It is a principal part circuit diagram containing the rotor field winding of the field winding type rotary electric machine which concerns on the 4th modification of this invention. It is a principal part circuit diagram containing the rotor field winding of the field winding type rotary electric machine which concerns on the 5th modification of this invention.

Hereinafter, specific embodiments of the field winding type rotating electrical machine according to the present invention will be described with reference to FIGS.

[Embodiment 1]
In the first embodiment of the present invention, the field winding type rotary electric machine 20 is a synchronous motor generator mounted on, for example, a vehicle. Hereinafter, the field winding type rotating electrical machine 20 is simply referred to as the rotating electrical machine 20. The rotating electrical machine 20 generates a driving force for driving the vehicle when electric power is supplied from a power source 22 such as a battery as shown in FIG. Further, the rotating electrical machine 20 generates electric power for charging the battery by being supplied with driving force from the engine of the vehicle. As shown in FIG. 2, the rotary electric machine 20 includes a stator (armature) 24, a rotor (field) 26, a housing 28, and a bearing 30.

The stator 24 is housed in a space surrounded by the housing 28 and is fixed to the housing 28. The stator 24 has a stator core 32 and a stator armature winding 34. The stator core 32 constitutes a part of a magnetic path through which magnetic flux flows. The stator core 32 is formed in a hollow cylindrical shape having a hole 36 at the center of the shaft. As shown in FIG. 3, the stator core 32 includes a plurality of slots 38 and a plurality of teeth 40. Each slot 38 opens radially inward with respect to the core body and extends along the axial direction. The slots 38 are arranged at predetermined intervals in the circumferential direction. The slot 38 accommodates the straight portion of the stator armature winding 34. The stator armature winding 34 is wound around the teeth 40 of the stator core 32. The stator armature winding 34 has three-phase U, V, and W phase windings.

The rotor 26 is rotatably accommodated in the hole 36 of the stator core 32. The rotor 26 is disposed to face the stator 24 with a predetermined air gap inward in the radial direction. The rotor 26 is rotatably supported by the housing 28 via a bearing 30. The rotor 26 has a rotor core 42 and a rotor field winding 44. The rotor core 42 constitutes a part of a magnetic path through which magnetic flux flows.

The rotor core 42 has a boss portion 46 and a plurality of salient pole portions 48. The boss portion 46 is formed in a cylindrical shape, and is a portion where the rotor shaft 50 is inserted into the hollow hole. Each salient pole portion 48 is a portion that protrudes radially outward from the boss portion 46. The salient pole portions 48 are arranged at predetermined intervals in the circumferential direction. The salient pole portion 48 is a main pole that forms a field pole (specifically, an N pole and an S pole). The rotor field winding 44 is wound around the salient pole portion 48 of the rotor core 42 so as to surround it. The rotor field winding 44 is intensively wound for each salient pole portion 48.

The rotating electrical machine 20 includes a rectifying element 52. The rectifying element 52 is a diode connected to both ends of the rotor field winding 44. The anode terminal of the rectifying element 52 is connected to one end of the rotor field winding 44, and the cathode terminal of the rectifying element 52 is connected to the other end of the rotor field winding 44. The rectifying element 52 has a function of half-wave rectifying the AC voltage induced in the rotor field winding 44 and limiting the direction of the current flowing through the rotor field winding 44 to one direction. Due to the function of the rectifying element 52, each salient pole portion 48 is excited to one of the N pole and the S pole. Further, the salient pole portions 48 are excited such that the N pole salient pole portions 48 and the S pole salient pole portions 48 are alternately arranged in the circumferential direction.

The rotating electrical machine 20 includes a capacitor 54. The capacitor 54 has one end connected to the anode terminal of the rectifying element 52 and one end of the rotor field winding 44, and the other end connected between both ends of the rotor field winding 44. , A passive element capable of storing electric charge. The capacitor 54 has a capacitance C. It should be noted that the connection position between the other end of the capacitor 54 and the rotor field winding 44 is a portion that is easily affected by a leakage flux or a harmonic flux of a magnetic flux that flows through the rotor field winding 44 to the field pole, and a portion that is difficult to receive. It is desirable that the boundary position be divided into The rotor field winding 44, the rectifying element 52, and the capacitor 54 may be arranged in a circuit for each pole or for each pole pair, or may be one set as a whole.

The rotor field winding 44 has a plurality of n field winding portions 44-1, 44-2,..., 44-n connected in series. Hereinafter, in the present embodiment, the rotor field winding 44 is assumed to have two field winding portions, and each of the first field winding portion 44-1 and the second field winding portion 44-2. Call it. A connection point between the first field winding portion 44-1 and the second field winding portion 44-2 is connected to the other end of the capacitor 54.

The first field winding portion 44-1 is a portion connected between the cathode terminal of the rectifying element 52 and the other end of the capacitor 54. The second field winding portion 44-2 is connected in parallel to the capacitor 54, and both ends are connected between one end of the capacitor 54 (that is, the anode terminal of the rectifying element 52) and the other end of the capacitor 54. It is a part. In the capacitor 54, the direction of the voltage e1 generated at both ends of the first field winding portion 44-1 and the direction of the voltage e2 generated at both ends of the second field winding portion 44-2 are opposite to each other. When the two voltages e1 and e2 cancel each other, the excitation energy corresponding to the canceling voltage is stored.

The connection point between the first field winding portion 44-1 and the second field winding portion 44-2 is unlikely to receive the rotor field winding 44 as a portion that is susceptible to leakage magnetic flux or harmonic magnetic flux. What is necessary is just to set to the part divided into a part. The first field winding portion 44-1 has an inductance L1. The second field winding portion 44-2 has an inductance L2. The first field winding portion 44-1 is disposed on the side close to the stator core 32 in the radial direction of the salient pole portion. The second field winding portion 44-2 is disposed on the far side from the stator core 32 in the radial direction of the salient pole portion 48. That is, the first field winding portion 44-1 is disposed closer to the stator core 32 (ie, radially outward) than the second field winding portion 44-2.

The first field winding portion 44-1 and the second field winding portion 44-2 are arranged, for example, by winding the second field winding portion 44-2 around the salient pole portion 48 of the rotor core 42. Thereafter, the first field winding portion 44-1 may be wound around the radially outer side of the second field winding portion 44-2.

As shown in FIG. 1, the rotating electrical machine 20 is connected to an inverter circuit 60 connected in parallel to the power source 22. The inverter circuit 60 is connected to the stator armature winding 34 and is a circuit that applies voltage to the phase windings of the phases U, V, and W of the stator armature winding 34. The inverter circuit 60 includes an upper arm element 62 and a lower arm element 64 that are connected in series between both ends of the power supply 22. Three sets of the upper arm element 62 and the lower arm element 64 are provided corresponding to the phase windings of the phases U, V, and W.

Each of the

arm elements

62 and 64 includes a switching element 66 such as an insulated gate bipolar transistor (that is, IGBT) or a MOS field effect transistor, and a flywheel diode 68. The switching element 66 of the upper arm element 62 and the switching element 66 of the lower arm element 64 of each phase U, V, W are turned on / off in opposite phases. The switching element 66 of the upper arm element 62 of each phase U, V, W is turned on for a predetermined period with a predetermined phase difference.

Smoothing capacitors 70 are connected to both ends of the inverter circuit 60. The smoothing capacitor 70 is connected to both ends of the power source 22 and is connected to the power source 22 in parallel. The smoothing capacitor 70 is for smoothing the voltage generated between both ends of the inverter circuit 60.

A control circuit 72 is connected to the inverter circuit 60. The control circuit 72 is connected to the switching elements 66 of the

arm elements

62 and 64 of the inverter circuit 60 and is a circuit that controls the inverter circuit 60. A position sensor 74 for detecting the rotational position of the rotor 26 is connected to the control circuit 72. The control circuit 72 drives the inverter circuit 60 based on the rotational position of the rotor 26 obtained from the position sensor 74 so that a desired current flows through the stator armature winding 34. Inverter circuit 60 has phase windings of U, V, and W so that a desired rotating magnetic field is generated from stator armature winding 34 when switching element 66 is driven in accordance with a drive command from control circuit 72. Voltage is applied to

Next, the operation of the rotating electrical machine 20 of this embodiment will be described.

In order to induce a field current in the rotor field winding 44, the control circuit 72 controls the rotor core 42 separately from the fundamental wave component (that is, a synchronous current) that is a current for generating a rotating torque in the rotating electrical machine 20. An excitation component, which is a current for excitation, is applied to the stator armature winding 34. That is, the control circuit 72 causes the stator armature winding 34 to have a current in which a fundamental wave component for generating rotational torque and an excitation component for rotor excitation whose cycle is shorter than that of the fundamental wave component flow. The inverter circuit 60 is controlled. The control circuit 72 independently controls the amplitude and period of each of the fundamental wave component and the excitation component.

As shown in FIG. 4, the current flowing through the stator armature winding 34 is the sum of currents obtained by superimposing the fundamental wave component and the excitation component. As shown in FIGS. 5 and 6, the fundamental wave component is a current that changes in a sine wave shape with time. The excitation component for exciting the rotor is a current having a short period (that is, a high frequency) compared to the fundamental wave component, and a current having a smaller amplitude than the fundamental wave component. This excitation component is a current that pulsates with respect to the fundamental wave component, and is a harmonic component that continuously changes over time.

The harmonic component for exciting the rotor is a standing wave having a half period with respect to the fundamental component as an envelope. The phase of the harmonic component for exciting the rotor with respect to the fundamental component is set so that the maximum amplitude of the harmonic component is generated avoiding the required timing of the fundamental component. For example, as shown in FIG. 5, the harmonic component may be phase-adjusted so that the maximum amplitude is generated at a timing avoiding the maximum amplitude of the fundamental wave component. Further, as shown in FIG. 6, the harmonic component may be phase-adjusted so that the maximum amplitude is generated at the maximum amplitude of the fundamental wave component. The amplitude of the harmonic component for exciting the rotor is adjusted so as to be smaller than the amplitude of the fundamental component.

When a fundamental current flows from the inverter circuit 60 to each phase winding of the stator armature winding 34 according to the drive command of the control circuit 72, a rotating magnetic field that rotates the rotor 26 is generated. Further, when a harmonic current flows through each phase winding of the stator armature winding 34, an alternating magnetic field corresponding to the harmonic current is generated and an exciting magnetic flux is generated. In this case, the exciting magnetic flux is linked to the salient pole portion 48 of the rotor core 42, and an AC voltage is generated in the rotor field winding 44 to induce a field current. A rotational torque for rotating the rotating electrical machine 20 is generated by the fundamental wave current of the stator armature winding 34 and the field current of the rotor field winding 44.

A rectifying element 52 is connected to both ends of the rotor field winding 44, and the rotor field winding 44 is short-circuited via the rectifying element 52. Therefore, even when an AC voltage is generated in the rotor field winding 44 as described above, the current flows through the rotor field winding 44 only in one direction, so that the rotor core 42 is excited in a predetermined direction and the rotor core 42 is excited. Field poles (specifically, N pole and S pole) are formed at 42. The field flux for forming this field pole is formed by energizing the stator armature winding 34 with an exciting current for exciting the rotor and rectifying the current in the rotor field winding 44.

Incidentally, the rotor field winding 44 has an inductance, and the rotor field winding 44 of each pole constitutes a partial inductance at each portion. Since the magnetic flux flowing in the field pole includes leakage flux, harmonic flux, and the like, the amount and direction of the magnetic flux penetrating depending on the position of the rotor field winding 44 are different from each other. The direction of the generated voltage is not uniform and varies depending on time and rotor rotational position.

Specifically, the direction of the voltage generated in the rotor field winding 44 composed of the two field winding portions 44-1 and 44-2 has four patterns as shown in FIG. In these four patterns, the direction of the voltage e1 generated in the first field winding portion 44-1 and the direction of the voltage e2 generated in the second field winding portion 44-2 are the same direction (pattern 1 and pattern 4), and in the opposite direction (pattern 2 and pattern 3). When a voltage canceling each other is generated in each partial inductance of the rotor field winding 44 as shown in the pattern 2 and the pattern 3, the entire voltage of the rotor field winding 44 is lowered, the excitation current is reduced, and the excitation energy is reduced. There is a risk of loss.

On the other hand, in the rotating electrical machine 20 of the present embodiment, as shown in FIG. 8, the rectifying element 52 is connected to both ends of the rotor field winding 44, and the anode terminal of the rectifying element 52 and the rotor field A capacitor 54 is connected between the middle portion of the winding 44. That is, a capacitor 54 having one end connected to the anode terminal of the rectifying element 52 and the other end connected between both ends of the rotor field winding 44 is provided.

In the structure of the rotating electrical machine 20, as shown in FIG. 9, the first field winding portion 44-1 and the second field winding portion 44 are separated at the connection point between the rotor field winding 44 and the capacitor 54. -2, the applied voltage directions are opposite to each other so that the voltages e1 and e2 cancel each other, and the voltages e1 and e2 cause the field windings 44-1 and 44-2 to rectify. 52 is applied so that a current flows from the connection portion side to the connection portion side to the other end of the capacitor 54 (pattern 2), the current flowing through each of the field winding portions 44-1 and 44-2 Flows toward the capacitor 54. In this case, excitation energy corresponding to the voltage canceling each other between the first field winding portion 44-1 and the second field winding portion 44-2 is stored in the capacitor 54, and the capacitor 54 is charged. .

After charging the capacitor 54, the voltage direction of the first field winding portion 44-1 and the voltage direction of the second field winding portion 44-2 are switched as shown in FIG. , E2 are applied in such a direction that the field winding portions 44-1 and 44-2 flow in a direction in which they cancel each other so that a current flows from the connection portion side to the other end of the capacitor 54 to the connection portion side to the rectifying element 52. In the case (pattern 3), a current flows from the capacitor 54 side to each of the field winding portions 44-1 and 44-2. In this case, the energy stored in the capacitor 54 is released to the field winding portions 44-1 and 44-2, and the capacitor 54 is discharged. Then, charging and discharging of the capacitor 54 are repeated.

As described above, the voltage e1 generated in the first field winding portion 44-1 and the voltage e2 generated in the second field winding portion 44-2 due to leakage magnetic flux, harmonic magnetic flux and the like are mutually When canceling each other, the voltage acting on the entire rotor field winding 44 decreases, but the excitation energy corresponding to the mutually canceling voltages is stored in the capacitor 54. When the voltage direction is switched after the capacitor 54 is charged, the energy stored in the capacitor 54 is released to the rotor field winding 44 and converted into an excitation current that excites the rotor core 42. .

Therefore, according to the rotating electrical machine 20 of the present embodiment, when a voltage in a direction canceling each other is generated in each field winding portion 44-1 and 44-2 of the rotor field winding 44, the rotor field winding A field current can be secured by efficiently converting the excitation energy generated at 44 into an excitation current. For this reason, it is possible to prevent the occurrence of excitation energy loss due to a decrease in excitation current when a voltage in a direction canceling each other is generated in each field winding portion 44-1 and 44-2 of the rotor field winding 44. Thus, even when the voltages cancel each other, the rotor core 42 can be excited efficiently.

Further, since the field current is ensured as described above, the harmonic component to be superimposed on the fundamental wave component as the stator current flowing through the stator armature winding 34, which is necessary for forming the field pole in the rotor core 42, has a small amplitude. Can be suppressed. For this reason, according to the structure of the rotary electric machine 20, torque ripple can be reduced compared with the case where the amplitude of a harmonic component is comparatively large (refer FIG. 4).

In the rotating electrical machine 20, the first field winding portion 44-1 of the rotor field winding 44 is disposed on the side closer to the stator core 32 in the radial direction of the salient pole portion 48 and the second field magnet. The winding portion 44-2 is disposed on the side far from the stator core 32 in the radial direction of the salient pole portion. Since the magnetic flux penetrating the salient pole portion 48 of the rotor core 42 includes a leakage magnetic flux, the amount of magnetic flux penetrating and the direction thereof can be different depending on the position of the rotor field winding 44. This phenomenon is particularly noticeable in the harmonic magnetic flux, and there is a large difference in the amount of magnetic flux between the side close to the stator core 32 and the side far from the stator core 32 of the rotor field winding 44 (that is, the boss portion 46 side of the rotor core 42). For this reason, according to the structure of the rotary electric machine 20 described above, the energy stored in the capacitor 54 can be increased by the difference, and a field current can be obtained effectively.

In the rotating electrical machine 20, the first field winding portion 44-1 of the rotor field winding 44 and the capacitor 54 constitute a resonance circuit. Hereinafter, the resonance circuit including the first field winding portion 44-1 and the capacitor 54 is referred to as a first resonance circuit 80. The first resonance circuit 80 has a first resonance frequency f1. The first resonance frequency f1 is calculated according to the following equation (1) based on the inductance L1 of the first field winding portion 44-1 and the capacitance C of the capacitor 54.

The second field winding portion 44-2 of the rotor field winding 44 and the capacitor 54 constitute a resonance circuit. Hereinafter, the resonance circuit composed of the second field winding portion 44-2 and the capacitor 54 is referred to as a second resonance circuit 82. The second resonance circuit 82 has a second resonance frequency f2. The second resonance frequency f2 is calculated according to the following equation (2) based on the inductance L2 of the second field winding portion 44-2 and the capacitance C of the capacitor 54.

f1 = 1 / (2 × π × (L1 × C) ^1/2 ) (1)
f2 = 1 / (2 × π × (L2 × C) ^1/2 ) (2)

The inductance L1 of the first field winding portion 44-1 and the capacitance C of the capacitor 54 are superimposed on the fundamental wave component as the current flowing through the stator armature winding 34, and are continuously timed for rotor excitation. Resonant relationship with the frequency of the changing harmonic component. Alternatively, the inductance L2 of the second field winding portion 44-2 and the capacitance C of the capacitor 54 are in a resonance relationship with the frequency of the harmonic component. That is, at least one of the first resonance frequency f1 and the second resonance frequency f2 is equal to or close to the frequency of the harmonic component. Note that both the first resonance frequency f1 and the second resonance frequency f2 may be equal to or close to the frequency of the harmonic component.

Also, the resonance frequency band may be expanded by setting the first resonance frequency f1 and the second resonance frequency f2 to be different from each other. According to this configuration, the harmonic component can be easily matched with the resonance frequencies f1 and f2 of the

resonance circuits

80 and 82. Further, in this case, when both resonance frequencies f1 and f2 are approximated to each other and resonance occurs even at a frequency between the two resonance frequencies f1 and f2, the frequency of the harmonic component is the first resonance frequency thereof. The frequency may be between f1 and the second resonance frequency f2, and according to this configuration, the harmonic component can be easily matched between the resonance frequencies f1 and f2.

As described above, in the configuration in which at least one of the first resonance frequency f1 and the second resonance frequency f2 and the frequency of the harmonic component are in a resonance relationship, the stator armature winding 34 is compared to the configuration in which there is no resonance relationship. When a current in which a fundamental wave component and a harmonic component are superimposed on each other flows, a field current induced in the rotor field winding 44 of each pole easily flows. Therefore, according to the rotating electrical machine 20, the impedance at the time of excitation of the rotor field winding 44 can be reduced, and the excitation performance of the rotor field winding 44 can be improved.

When the impedance of the rotor field winding 44 is low, the rotor field winding 44 is appropriately excited even if the amplitude of the harmonic component for exciting the rotor is small. That is, in order to induce the exciting current appropriately in the rotor field winding 44, it is sufficient that the amplitude of the harmonic component for exciting the rotor is small. For this reason, according to the rotating electrical machine 20 of the present embodiment, the amplitude of the harmonic component superimposed on the fundamental wave component as the current flowing through the stator armature winding 34 can be suppressed, so that the harmonic component for rotor excitation can be reduced. The resulting torque ripple can be reduced.

In the rotating electrical machine 20, the harmonic component for exciting the rotor is controlled independently of the fundamental component. This harmonic component has a standing wave having a half period with respect to the fundamental component as an envelope. The phase of the harmonic component for exciting the rotor with respect to the fundamental component is set so that the maximum amplitude of the harmonic component is generated avoiding the required timing of the fundamental component. For this reason, it is possible to appropriately perform excitation of the rotor field winding 44 by the harmonic component while appropriately generating the rotational torque by the fundamental wave component. Further, the amplitude of the harmonic component is adjusted so as to be smaller than the amplitude of the fundamental component. Therefore, by adjusting the amplitude of the harmonic component superimposed on the fundamental wave component using the standing wave as an envelope, the amount of exciting current for exciting the rotor field winding 44 can be controlled. It is easy to control.

Next, a method for generating harmonic components in the control circuit 72 will be described.
The control circuit 72 causes the above harmonic components to be superimposed on the fundamental component from a low rotation (for example, 0 [rpm]) to a high rotation (for example, MAX [rpm] such as 15000 [rpm]) of the rotating electrical machine 20. The inverter circuit 60 is controlled. The control of the inverter circuit 60 by the control circuit 72 is based on a fundamental wave within a predetermined frequency range in which the harmonic component includes at least one of the resonance frequencies f1 and f2 of the

resonance circuits

80 and 82 from the low rotation to the high rotation of the rotating electrical machine 20. It is performed so as to be superimposed on the component. This predetermined frequency range is a range in which the excitation current flowing in the rotor field winding 44 due to the superimposed harmonic component or the torque obtained by the excitation current is equal to or greater than a predetermined value. It is within the range of 40%. The predetermined frequency range is preferably within a range of, for example, ± 25% with respect to the resonance frequencies f1 and f2.

According to such control processing, harmonic components having frequencies close to the resonance frequencies f1 and f2 can be superimposed on the fundamental wave component regardless of the frequency of the fundamental wave component from low rotation to high rotation. The impedance at the time of excitation of the magnetic winding 44 can be reduced, and the excitation performance of the rotor field winding 44 can be improved. Since the amplitude of the harmonic component superimposed on the fundamental component, which is the current flowing through the stator armature winding 34, can be suppressed from low rotation to high rotation, the torque ripple caused by the harmonic component for rotor excitation Can be reduced.

Specifically, the control circuit 72 controls the inverter circuit 60 that applies a voltage to the three-phase winding of the stator armature winding 34 by using a PWM (Pulse Width Modulation) control method and a rectangular wave control method. Perform while switching. The PWM control system is a control system that performs current feedback, and directs a number of pulse voltages that are pulse-width modulated by comparing a voltage command generated according to a torque command and a carrier wave (for example, a triangular wave) to the inverter circuit 60. Output. The PWM control method is a control method excellent in control response, and is performed from the low rotation region to the middle rotation region of the rotating electrical machine 20. In addition, the rectangular wave control method is a control method that performs torque feedback by performing phase control of the rectangular wave voltage, and the amplitude is maximum every electrical angle 180 ° within one control period (ie, electrical angle 360 °). One rectangular wave voltage fixed to the value or the minimum value is output to the inverter circuit 60. The rectangular wave control method is performed from the middle rotation region to the high rotation region of the rotating electrical machine 20.

In the PWM control region (low rotation to medium rotation) in which the PWM control method is implemented, the control circuit 72 generates a harmonic component that induces an excitation current in the rotor field winding 44 and generates a harmonic component and a harmonic component. The inverter circuit 60 is PWM driven so that a current superimposed with the wave component flows. Further, in the rectangular wave control region (medium rotation to high rotation) where the rectangular wave control method is implemented, in order to generate a harmonic component that induces an excitation current in the rotor field winding 44, the harmonics described in detail later. Execute the generation process.

In generating a magnetic flux that induces an exciting current in the rotor field winding 44 in the rectangular wave control method, the fundamental wave component of the stator armature winding 34 is delayed by an electrical angle of 90 ° from the fundamental wave component. It is effective to flow a pulsed current that generates a magnetic field in the same direction as in the above. When a certain phase (hereinafter referred to as a reference phase, for example, a V phase) is used as a reference, the above-described phase in which a pulse-like current can flow is an adjacent two phases adjacent to each other in the circumferential direction, which is different from the reference phase ( For example, U phase and W phase). Therefore, in order to flow a pulsed current that generates a magnetic field in the same direction as that of the fundamental wave component, a pulse current is passed through two adjacent phases at a timing delayed by an electrical angle of 90 ° with respect to the fundamental wave component of the reference phase. And it is sufficient.

For example, as shown in FIG. 11, when the V-phase current of the fundamental wave component flowing in the phase winding of the V-phase that is the reference phase is maximum, based on the V-phase current between the stator 24 and the rotor 26. A clockwise magnetic flux φ1 is generated, and a counterclockwise magnetic flux φ2 is generated adjacent to the circumferential direction. That is, the magnetic fluxes φ1 and φ2 adjacent in the circumferential direction are directed in opposite directions. In this case, the salient pole portion 48 on one side (left side in FIG. 11) of the rotor core 42 is magnetized in the arrow direction A1 to become the N pole, and the salient pole portion 48 on the other side (right side in FIG. 11) is in the arrow direction. It is magnetized by A2 and becomes the S pole.

In FIG. 11 and the like, “U”, “V”, and “W” indicate phases of the stator armature winding 34, and “+” and “−” attached to the respective phases are The direction of the current flowing through the stator armature winding 34 is shown. For example, when a positive current flows in the V phase, “V +” indicates that the current flows in the V-phase winding, and “V−” indicates that the current flows in the V-phase winding. Indicates that current flows in the lateral direction. The opposite is true when a negative current flows in the V phase.

Further, even when the magnetic fluxes φ1 and φ2 are generated, the magnetic flux between the stator 24 and the rotor 26 is adjacent to both the magnetic fluxes φ1 and φ2 in the circumferential direction, that is, in the circumferential center of the magnetic fluxes φ1 and φ2. It is possible to excite the rotor field winding 44 by generating a magnetic flux φp in the clockwise direction similar to the direction of φ1. This clockwise magnetic flux φp is different from the reference phase V phase, and the pulse current flowing in the phase winding indicated by “U−” and the “U−” phase winding adjacent in the circumferential direction “ And a pulse current flowing through the phase winding indicated by “W +”. Therefore, the rotor field winding 44 can be excited by generating the magnetic flux φp together with the magnetic fluxes φ1 and φ2.

Also, the current of the fundamental wave component is delayed by a power factor (eg, 0.7 to 0.9) and delayed by a predetermined electrical angle (eg, 20 ° to 45 °) with respect to the voltage. Furthermore, the pulse current is hardly delayed with respect to the pulse voltage. Therefore, the optimum timing for adding positive and negative voltage pulse pairs corresponding to the pulse currents flowing in the adjacent two phases to the fundamental wave components of those adjacent two phases is a rectangular wave voltage corresponding to the positive current center of the fundamental wave component of the reference phase. The timing is delayed by a predetermined electrical angle corresponding to the power factor described above from the center (positive voltage center) of the ON period of the waveform.

However, in applying positive and negative voltage pulse pairs to adjacent two-phase phase windings, the rectangular wave voltages corresponding to the fundamental wave components of these adjacent two phases are in different states (ie, the Hi state and the Lo state). It is necessary. The electrical angle from the positive voltage center of the reference phase to the state where the adjacent two-phase rectangular wave voltages are different from each other corresponds to the fundamental wave component of one phase of the adjacent two phases from the positive voltage center of the reference phase. It is 30 ° until the beginning of the on period of the rectangular wave voltage waveform. Therefore, if a positive / negative voltage pulse pair is applied to the adjacent two-phase phase winding after a timing delayed by an electrical angle of 30 ° from the positive voltage center of the reference phase, the harmonic component can be superimposed on the fundamental component, and the rotor It is possible to generate a magnetic flux that induces an exciting current in the field winding 44. That is, in the rectangular wave control region, a magnetic field in the same direction as the magnetic field generated by the current flow of the fundamental wave component of the reference phase can be generated in two adjacent phases, and an excitation current can be induced in the rotor field winding 44. it can.

The resonance frequencies f1 and f2 of the

resonance circuits

80 and 82 are constant. On the other hand, the frequency (or period) of the fundamental wave component that flows through the stator armature winding 34 changes according to the rotational speed rpm of the rotating electrical machine 20. Specifically, as the number of rotations rpm of the rotating electrical machine 20 increases, the period of the fundamental wave component decreases. Further, the target pulse number per one control cycle (that is, electrical angle 360 °) optimum for improving the excitation property of the rotor field winding 44 of the harmonic component is increased as the rotational speed rpm of the rotating electrical machine 20 is increased. Less. When the rotor 26 of the rotating electrical machine 20 is, for example, a quadrupole pair, the target pulse number decreases as the rotational speed rpm increases, as shown in FIG. 12, for example, the rotational speed rpm becomes medium (specifically, , “4000”), the target pulse number is less than “9”.

In order to generate one harmonic component to be superimposed on the fundamental component of the reference phase (for example, V phase) during one control cycle, positive and negative are applied to adjacent two phase windings (for example, U phase and W phase). A set of voltage pulse pairs may be applied. A method of applying a pair of positive and negative voltage pulse pairs to adjacent two phases is to turn on a rectangular wave voltage waveform for generating a fundamental wave component applied to a phase winding of one phase (first phase) of the adjacent two phases. At the beginning of the period, a negative voltage pulse (shown by hatching in FIG. 16) for cutting off the ON period by a predetermined period a and turning it off is added, and one of the two adjacent phases ( In the OFF period of the rectangular wave voltage waveform for generating the fundamental wave component applied to the phase winding of the second phase), a positive voltage pulse for turning on for a predetermined period a paired with the negative voltage pulse (see FIG. 16). There is a method of adding (shown by diagonal lines). The application of the negative voltage pulse to the beginning of the on period of the first-phase rectangular wave voltage waveform and the application of the positive voltage pulse to the off-period of the second phase rectangular wave voltage waveform are performed at the same timing. (For example, electrical angles ω5 to ω6 in FIG. 16). The predetermined period a is an electrical angle necessary for generating a harmonic component for improving the excitation property of the rotor field winding 44.

According to the application processing of a set of positive and negative voltage pulse pairs to adjacent two phases with respect to the reference phase, one harmonic component can be generated. By applying a set of positive and negative voltage pulse pairs to the adjacent two-phase windings with respect to the reference phase when the three phases are all the reference phases (rotor positions “1” and “3” in FIG. 15). ”And“ 5 ”, and the electrical angles ω1 to ω2, ω5 to ω6, and ω9 to ω10) in FIG. 16, and harmonic components per control cycle can be generated three times at equal intervals.

As a method of applying a set of positive and negative voltage pulse pairs to adjacent two phases, the on-period of the rectangular wave voltage waveform for generating the fundamental wave component applied to the phase winding of the first phase of the adjacent two phases is used. A rectangular wave for generating a fundamental wave component to be applied to the phase winding of the second phase of the adjacent two phases is added to the end, adding a positive voltage pulse for adding ON period by a predetermined period a. There is a method of adding a negative voltage pulse for turning off for a predetermined period a paired with the positive voltage pulse to the on period of the voltage waveform. The application of the positive voltage pulse to the end of the on period of the first phase rectangular wave voltage waveform and the application of the negative voltage pulse to the on period of the second phase rectangular wave voltage waveform are performed at the same timing. (For example, electrical angles ω11 to ω12).

Similarly, one harmonic component can be generated by applying a pair of positive and negative voltage pulse pairs to adjacent two phases with respect to the reference phase. By applying a set of positive and negative voltage pulse pairs to adjacent two-phase windings with respect to the reference phase when all three phases are used as reference phases (rotor positions “2” and “4” in FIG. 15). ”,“ 6 ”, and electrical angles ω3 to ω4, ω7 to ω8, and ω11 to ω12) in FIG. 16, and harmonic components can be generated three times at regular intervals during one control period.

Therefore, the rectangular wave voltage waveform for generating the fundamental wave components of the three phases U, V, and W is delayed by a predetermined period a, and the reverse pulse voltage is applied in any other phase during the period corresponding to the predetermined period a. If applied, harmonic components can be generated six times at regular intervals during one control cycle, and the rotor field winding 44 can be excited six times at regular intervals per control cycle.

For example, when the rotor 26 of the rotating electrical machine 20 is a quadrupole pair, the target number of pulses per control cycle of the harmonic component is, as shown in FIG. 12, the rotational speed rpm of the rotating electrical machine 20 is “5000”, “6000”. , “7000”, and “8000” are “7.2”, “6”, “5.1”, and “4.5”, respectively. In this case, when the rotational speed rpm of the rotating electrical machine 20 is in the middle rotational range of “5000” or more and “8000” or less, 6 pairs of positive and negative voltage pulse pairs are equally spaced on the stator armature winding 34 per control cycle. If the rotor field winding 44 is excited six times at equal intervals and applied twice, the actual frequency deviation rate (= (harmonic) of the harmonic components with respect to the resonance frequencies f1 and f2 of the

resonance circuits

80 and 82 of the rotating electrical machine 20 The actual frequency of the component) / f1) or (the actual frequency of the harmonic component) / f2)) is limited to a predetermined range. Specifically, as shown in FIG. 12, the deviation rate is “0.83” when the rotational speed rpm of the rotating electrical machine 20 is “5000”, “6000”, “7000”, and “8000”, respectively. , “1.00”, “1.17”, and “1.33”.

Therefore, when the rotational speed rpm of the rotating electrical machine 20 is in the range of “5000” or more and “8000” or less, if the rotor field winding 44 is excited six times at regular intervals per control cycle, the harmonic component As shown in FIG. 12 and FIG. 13, the actual frequency of is suppressed to approximately ± 40% of the resonance frequencies f1 and f2 including the resonance frequencies f1 and f2. If the actual frequency of the harmonic component is suppressed within this range, as shown in FIG. 14, the exciting current obtained in the rotor field winding 44 is obtained when the actual frequency of the harmonic component is the resonance frequencies f1 and f2. While taking the maximum value, it becomes more than the allowable threshold value, and the rotational torque obtained by the rotating electrical machine 20 becomes more than the allowable threshold value while taking the maximum value when the actual frequency of the harmonic component is the resonance frequency f1, f2. .

Therefore, the control circuit 72 performs three-phase U, U based on the above-described method as the harmonic generation process executed in the rectangular wave control region that is the middle rotation region where the rotation speed rpm is “5000” or more and “8000” or less. For each phase winding of V and W, the rectangular wave voltage waveform for generating each fundamental wave component is delayed by a predetermined period a, and a reverse pulse voltage is applied in any other phase during the period corresponding to the predetermined period a. Append. In this harmonic generation process, harmonic components can be generated six times at regular intervals per control cycle (ie, electrical angle 360 °) in the middle rotation range, and the rotor field winding 44 can be generated per control cycle, etc. It can be excited six times at intervals.

According to the harmonic generation process, the resonance frequency f1, the fundamental wave component is included in the fundamental wave component regardless of the frequency of the rectangular wave fundamental wave component in the middle rotation range where the rotation speed rpm is “5000” or more and “8000” or less. A harmonic component having a frequency close to f2 (specifically, within a range of approximately ± 40% with respect to the resonance frequencies f1 and f2) can be superimposed.

Further, when the rotor 26 of the rotating electrical machine 20 is, for example, a quadrupole pair, the target number of pulses per one control period of the harmonic component is, as shown in FIG. When “9000”, “10000”, “12000”, and “15000”, they are “4.5”, “4”, “3.6”, “3”, and “2.4”, respectively. In this case, when the rotation speed rpm of the rotating electrical machine 20 is higher than “8000” and is not higher than “15000”, positive and negative voltage pulse pairs are equally spaced on the stator armature winding 34 per control cycle. If it is applied six times and the rotor field winding 44 is excited six times at equal intervals, the deviation rate of the actual frequency of the harmonic component with respect to the resonance frequencies f1 and f2 exceeds a predetermined range (± 40%). .

On the other hand, when the rotational speed rpm of the rotating electrical machine 20 is in a high rotational range exceeding “8000” and “15000” or less, positive and negative voltage pulse pairs are applied to the stator armature winding 34 three times at regular intervals per control cycle. When applied and the rotor field winding 44 is excited three times at equal intervals, the deviation rate of the actual frequency of the harmonic component with respect to the resonance frequencies f1 and f2 is limited within a predetermined range. Specifically, as shown in FIG. 12, the deviation rate is “0.75” when the rotational speed rpm of the rotating electrical machine 20 is “9000”, “10000”, “12000”, and “15000”, respectively. , “0.83”, “1.00”, and “1.25”. When the rotational speed rpm is “8000”, the difference between the deviation rate at the third excitation and the deviation rate “1.00” is different from the deviation rate “1.33” at the sixth excitation. The same “0.67” is obtained.

For this reason, if the rotor field winding 44 is excited three times at equal intervals per control period when the rotational speed rpm of the rotating electrical machine 20 is in the range of more than “8000” and “15000” or less, the harmonics As shown in FIGS. 12 and 13, the actual frequency of the component is suppressed within a range of approximately ± 40% with respect to the resonance frequencies f1 and f2 including the resonance frequencies f1 and f2. If the actual frequency of the harmonic component is suppressed within this range, as shown in FIG. 14, the exciting current obtained in the rotor field winding 44 is obtained when the actual frequency of the harmonic component is the resonance frequencies f1 and f2. While taking the maximum value, it becomes more than the allowable threshold value, and the rotational torque obtained by the rotating electrical machine 20 becomes more than the allowable threshold value while taking the maximum value when the actual frequency of the harmonic component is the resonance frequency f1, f2. .

Therefore, the control circuit 72 performs a three-phase U based on the above-described method as a harmonic generation process executed in the rectangular wave control region, which is a high rotation region where the rotation speed rpm exceeds “8000” and is “15000” or less. For each phase winding of, V, W, a negative voltage pulse is added at the beginning of the on period of the rectangular wave voltage waveform for generating the fundamental wave component to cut off the on period by a predetermined period a. At the same time, a positive voltage pulse for turning on for a predetermined period a pairing with the negative voltage pulse is turned off in the off period of the rectangular wave voltage waveform for generating the fundamental wave component in any other adjacent phase. Append. Alternatively, instead of adding a positive / negative voltage pulse pair to the start timing of the on period of the rectangular wave voltage waveform, the end of the on period of the rectangular wave voltage waveform for generating the fundamental wave components of the three phases U, V, W In addition, a positive voltage pulse for adding the ON period by a predetermined period a is added, and at the same time, in the ON period of the rectangular wave voltage waveform for generating the fundamental wave component in any other adjacent phase Then, a negative voltage pulse for turning off for a predetermined period a paired with the positive voltage pulse is added. In this harmonic generation processing, harmonic components can be generated three times at equal intervals per control cycle (ie, electrical angle 360 °) in the high rotation range, and the rotor field winding 44 can be generated per control cycle. It can be excited three times at intervals.

According to this harmonic generation process, the resonance frequency f1 is applied to the fundamental wave component regardless of the frequency of the fundamental wave component of the rectangular wave in the high rotation range where the rotation speed rpm exceeds “8000” and is “15000” or less. , F2 (specifically, approximately within a range of ± 40% with respect to the resonance frequencies f1 and f2) can be superimposed.

Thus, when the rotation speed rpm of the rotating electrical machine 20 is higher than the middle rotation, the harmonic component is superimposed on the fundamental wave component per control cycle at equal intervals up to 6 times, and when the rotation speed rpm reaches high rotation The excitation of the rotor field winding 44 can be performed by switching the number of superimpositions of harmonic components superimposed at equal intervals on the fundamental wave component per control period to three times. For this reason, it is possible to reduce the impedance at the time of excitation of the rotor field winding 44 from the middle rotation to the high rotation of the rotating electrical machine 20 and improve the excitation performance of the rotor field winding 44. Further, since the amplitude of the harmonic component superimposed on the fundamental component that is the current flowing through the stator armature winding 34 can be suppressed, torque ripple caused by the harmonic component for rotor excitation can be reduced.

As is apparent from the above description, the rotating electrical machine 20 includes a stator armature winding 34 wound around the stator core 32, a rotor field winding 44 wound around the rotor core 42, and a rotor field winding. A rectifying element 52 connected to both ends of the wire 44; a capacitor 54 having one end connected to one end of the rectifying element 52 and the other end connected between both ends of the rotor field winding 44; and a stator armature winding A control circuit for inducing an excitation current in the rotor field winding 44 by flowing a current in which a fundamental wave component for generating a rotational torque in 34 and a harmonic component having a shorter period than the fundamental wave component are passed. 72. The inductances L1 and L2 of the rotor field winding 44 and the capacitance C of the capacitor 54 are in a resonance relationship with the frequency of the harmonic component for exciting the rotor.

According to this configuration, when a current in which a fundamental wave component and a harmonic component are superimposed flows in the stator armature winding 34, a field current induced in the rotor field winding 44 is likely to flow. Therefore, the impedance at the time of excitation of the rotor field winding 44 can be reduced, and the excitation performance of the rotor field winding 44 can be improved, so that the torque ripple caused by the harmonic component for rotor excitation Can be reduced.

In the rotating electrical machine 20, the amplitude of the harmonic component for exciting the rotor is adjusted by using a standing wave having a ½ period with respect to the fundamental component as an envelope. According to this configuration, the amount of exciting current for exciting the rotor field winding 44 can be easily controlled.

In the rotary electric machine 20, the rotor field winding 44 is connected to the first field winding portion 44-1 connected between the other end of the capacitor 54 and the other end of the rectifying element 52, and the capacitor 54. A second field winding portion 44-2 connected in parallel, and a first resonance frequency f1 based on the inductance L1 of the first field winding portion 44-1 and the capacitance C of the capacitor 54, and , At least one of the second resonance frequency f2 based on the inductance L2 of the second field winding portion 44-2 and the capacitance C of the capacitor 54 is within a predetermined frequency range including the frequency of the harmonic component for exciting the rotor. Alternatively, the frequency of the harmonic component for exciting the rotor is between the first resonance frequency f1 and the second resonance frequency f2.

According to this configuration, when the current in which the fundamental wave component and the harmonic component are superimposed flows in the stator armature winding 34, the first field winding portion 44-1 or the first field winding portion 44-1 of the rotor field winding 44 is provided. The field current induced in the two-field winding portion 44-2 can easily flow. Therefore, the impedance at the time of excitation of the rotor field winding 44 can be reduced, and the excitation performance of the rotor field winding 44 can be improved.

In the rotating electrical machine 20, the frequency of the harmonic component superimposed on the fundamental wave component, that is, the frequency to which the positive / negative voltage pulse pair is added, is from the low rotation to the high rotation of the inductances L 1 and L 2 of the rotor field winding 44 and the capacitor 54. A predetermined frequency range including the resonance frequencies f1 and f2 based on the capacitance C and where the obtained excitation current or rotational torque is more than necessary (more than a threshold value) (specifically, for example, ± 40% of the resonance frequencies f1 and f2) Range). According to this configuration, it is possible to superimpose harmonic components having frequencies close to the resonance frequencies f1 and f2 on the fundamental wave component from the low rotation to the high rotation regardless of the frequency of the fundamental wave component. The impedance at the time of exciting the wire 44 can be reduced, and the exciting property of the rotor field winding 44 can be improved.

In the rotary electric machine 20, the control circuit 72 induces an excitation current in the rotor field winding 44 in the rectangular wave control region and applies a fundamental wave component to be applied to one of the three phase windings. For generating a fundamental wave component to be applied to any other phase winding while adding a negative voltage pulse to cut off for a predetermined period a at the start of the on period of the rectangular wave voltage waveform for generation Harmonic generation processing is executed in which a positive voltage pulse for turning on for a predetermined period a that is paired with the negative voltage pulse is added to the off period of the rectangular wave voltage waveform. Alternatively, a positive voltage pulse for turning on by adding a predetermined period a to the end of the on period of the rectangular wave voltage waveform for generating the fundamental wave component applied to one phase winding of the three phase windings In addition, a negative voltage pulse for turning off for a predetermined period a paired with the positive voltage pulse during the on period of the rectangular wave voltage waveform for generating the fundamental wave component applied to any other phase winding The harmonic generation process is executed.

According to this configuration, a magnetic field in the same direction as the magnetic field generated by the current flow of the fundamental wave component can be generated by the harmonic generation process of applying positive and negative voltage pulse pairs to adjacent two phases, and the rotor field winding 44 An excitation current can be induced in

In the rotary electric machine 20, the control circuit 72 is in a predetermined rotation range from the middle rotation to the high rotation of the rotary electric machine 20 (specifically, a rotation range where the rotation speed rpm is “5000” or more and “8000” or less), By performing the above harmonic generation processing at the timing of both the start and end of the on period of the rectangular wave voltage waveform for each of the three-phase windings, excitation by the rotor field winding 44 is equally spaced per control cycle. 6 times. According to this configuration, the frequency of the generated harmonic component is suppressed within a predetermined range with respect to the resonance frequencies f1 and f2 of the

resonance circuits

80 and 82 in a predetermined rotation range from the middle rotation to the high rotation of the rotating electrical machine 20. The excitation current obtained in the rotor field winding 44 and the rotational torque obtained in the rotating electrical machine 20 can be set to an allowable threshold value or more.

In the rotary electric machine 20, the control circuit 72 performs the above harmonic generation process in a high rotation range of the rotary electric machine 20 (specifically, a rotation range where the rotation speed rpm exceeds “8000” and is “15000” or less). Is performed for each of the three-phase windings at the timing of one of the start and end of the on period of the rectangular wave voltage waveform, so that excitation by the rotor field winding 44 is performed three times at regular intervals per control cycle. . According to this configuration, the frequency of the generated harmonic component can be suppressed within a predetermined range with respect to the resonance frequencies f1 and f2 of the

resonance circuits

80 and 82 in the high rotation range of the rotating electrical machine 20, and the rotor field The exciting current obtained in the winding 44 and the rotational torque obtained by the rotating electrical machine 20 can be set to be equal to or higher than an allowable threshold.

By the way, in said 1st Embodiment, in the rotation area | region more than the middle rotation of the rotary electric machine 20, said harmonic generation | occurrence | production processing is carried out for the start end of the ON period of a rectangular wave voltage waveform for every three-phase phase winding, and / or By performing at the end timing, excitation by the rotor field winding 44 is performed 6 or 3 times at regular intervals per control cycle. When the rotational speed rpm of the rotating electrical machine 20 is in the vicinity of “8000”, the number of excitations per one control cycle by the rotor field winding 44 is switched between 6 times and 3 times. However, the present invention is not limited to this. If the number of excitations can be set to between 6 and 3 in the vicinity of the rotational speed “8000” rpm for switching the number of excitations per control cycle, the frequency of the generated harmonic component is set to the resonance circuit 80, It is possible to approach the resonance frequencies f1 and f2 of 82.

When the rotor 26 of the rotating electrical machine 20 is, for example, a quadrupole pair, the target number of pulses per control cycle of the harmonic component is “7000” or “8000”, as shown in FIG. , “9000”, and “10000” are “5.1”, “4.5”, “4”, and “3.6”, respectively. In this case, when the rotational speed rpm of the rotating electrical machine 20 is in a rotational range exceeding “7000” and “10000” or less, 4 pairs of positive and negative voltage pulses are equally spaced on the stator armature winding 34 per control cycle. If the rotor field winding 44 is excited four times at equal intervals, the deviation rate of the real frequency of the harmonic components with respect to the resonance frequencies f1 and f2 of the

resonance circuits

80 and 82 of the rotating electrical machine 20 is within a predetermined range. Limited. Specifically, as shown in FIG. 17, when the rotational speed rpm of the rotating electrical machine 20 is “8000”, “9000”, and “10000”, the deviation rates are “0.89”, “1. 00 ”and“ 1.11 ”. When the rotational speed rpm is “7000”, the difference between the deviation rate at the fourth excitation and the deviation rate “1.00” is different from the deviation rate “1.17” at the sixth excitation. It becomes large “0.78”.

For this reason, if the rotor field winding 44 is excited four times at regular intervals per control period when the rotational speed rpm of the rotating electrical machine 20 is in the range of more than “7000” and not more than “10000”, the harmonics As shown in FIG. 18, the actual frequency of the component is suppressed within a range of approximately ± 25% with respect to the resonance frequencies f1 and f2 including the resonance frequencies f1 and f2. Compared to a narrow range. Therefore, if the actual frequency of the harmonic component is suppressed within this range, the excitation current obtained in the rotor field winding 44 takes a maximum value when the actual frequency of the harmonic component is the resonance frequencies f1 and f2. On the other hand, it becomes an allowable threshold value or more, which is larger than the case of the 6-time excitation or the 3-time excitation described above. In addition, the rotational torque obtained by the rotating electrical machine 20 takes a maximum value when the actual frequency of the harmonic component is the resonance frequency f1, f2, and exceeds an allowable threshold value. It becomes larger than the case.

Therefore, the control circuit 72 performs phase generation of adjacent two phases adjacent to each other in the circumferential direction as a harmonic generation process executed in the rectangular wave control region where the rotation speed rpm exceeds “7000” and is “10000” or less. Positive and negative voltage pulse pairs are added to the rectangular wave voltage waveform to generate the fundamental wave component applied to the winding four times at regular intervals per control cycle, and the average value of the applied voltage per control phase is zero. And

Specifically, as the above-described harmonic generation processing, a rectangle for generating a fundamental wave component of a phase winding of a specific one of the three phases U, V, and W (W phase in the example shown in FIG. 19) is used. A negative voltage pulse for turning off the ON period by cutting out the ON period by a predetermined period a is added to the beginning of the ON period of the wave voltage waveform, and any other adjacent phase corresponding to the predetermined period a In the off period of the rectangular wave voltage waveform for generating the fundamental wave component (in the example shown in FIG. 19, the U phase), a positive voltage pulse for turning on for a predetermined period a that is paired with the negative voltage pulse is added. Further, a positive voltage pulse for turning on by adding the on period by a predetermined period a is added to the end of the on period of the rectangular wave voltage waveform for generating the fundamental wave component of the specific one-phase winding. Corresponding to the predetermined period a, during the on period of the rectangular wave voltage waveform for generating the fundamental wave component in any other adjacent phase (U phase in the example shown in FIG. 19), the positive voltage pulse A negative voltage pulse for turning off only for a predetermined period a to be paired is added.

In this harmonic generation process, the timings of both the start and end of the on-period of the rectangular wave voltage waveform of the phase winding of a specific one phase (for example, W phase) (electrical angles ω24 to ω25 and ω29 to ω30 in FIG. 19). ), A positive / negative voltage pulse pair is added to the rectangular wave voltage waveform of the adjacent two-phase winding including that phase, so that the harmonic component per control cycle (ie, electrical angle of 360 °) is 2 in a predetermined rotation range. It is generated at equal intervals (ie, electrical angle of 180 °).

In addition to the above harmonic generation processing, the control circuit 72 further includes the timings of the start and end of the rectangular wave voltage waveform of the specific one-phase phase winding (that is, the specific one phase). Adjacent two phases to which a positive / negative voltage pulse pair can be added at a timing separated by an electrical angle of 90 ° from the addition of a positive / negative voltage pulse pair to the rectangular wave voltage waveform of the adjacent two-phase phase winding (in the example shown in FIG. 19) A positive / negative voltage pulse pair is added to the rectangular wave voltage waveform of the phase winding of (V phase and W phase). Here, when a specific one phase is a W phase, a combination of phases that can apply a positive / negative voltage pulse pair of a predetermined period a in adjacent two phases at a timing separated by an electrical angle of 90 ° is a W phase and a V phase. Yes (see FIG. 15).

According to the addition of the positive and negative voltage pulse pairs, timings deviated by an electrical angle 90 from the timing at which the harmonic component per control cycle is generated twice at equal intervals (electrical angles ω22 to ω23 and ω27 to ω28 in FIG. 19). Thus, harmonic components per control cycle (ie, electrical angle 360 °) are generated twice at regular intervals (ie, electrical angle 180 °).

Accordingly, the rectangular wave voltage waveform for generating the fundamental wave component of one specific phase among the three phases U, V, and W is delayed by a predetermined period a, and any other phase is delayed during the period corresponding to the predetermined period a. And applying a reverse pulse voltage at the same time, and at a timing separated by an electrical angle of 90 ° from the respective timings of the start and end of the rectangular wave voltage waveform for generating the specific one-phase fundamental wave component, for a predetermined period of time in two adjacent phases. If a positive / negative voltage pulse pair a is applied, harmonic components can be generated four times at regular intervals during one control cycle, and the rotor field winding 44 is excited four times at regular intervals per control cycle. Can do.

According to the harmonic generation process, the resonance frequency f1, the fundamental wave component is included in the fundamental wave component regardless of the frequency of the rectangular wave fundamental wave component in the rotation region where the rotation speed rpm exceeds “7000” and is “10000” or less. A harmonic component having a frequency close to f2 (specifically, within a range of approximately ± 25% with respect to the resonance frequencies f1 and f2) can be superimposed. In this case, the configuration of the first embodiment in which the harmonic component is generated six times or three times at regular intervals in one control period in the rotation range where the rotation speed rpm exceeds “7000” and is “10000” or less. As compared with the above, the frequency of the generated harmonic component can be made closer to the resonance frequencies f1 and f2.

In this modification, when the rotational speed rpm of the rotating electrical machine 20 is higher than the middle rotational speed, the harmonic component is superimposed on the fundamental wave component per control cycle at regular intervals up to 6 times, and the rotational speed rpm becomes a predetermined high rotational speed. When the frequency reaches, the number of harmonic components to be superimposed on the fundamental wave component at regular intervals per control cycle is switched to 4 times. The rotor field winding 44 can be excited by switching the number of times of superimposing harmonic components superimposed at equal intervals on the hit fundamental wave component to three.

For this reason, according to this modified embodiment, the impedance at the time of excitation of the rotor field winding 44 is further reduced from the middle rotation to the high rotation of the rotating electrical machine 20 compared with the first embodiment, and the rotor Excitability of the field winding 44 can be improved. In addition, since the amplitude of the harmonic component superimposed on the fundamental wave component that is the current flowing through the stator armature winding 34 can be further suppressed, torque ripple caused by the harmonic component for rotor excitation can be further reduced. it can.

In the above-described first embodiment and its modifications, an example in which the rotor 26 of the rotating electrical machine 20 is a four-pole pair has been shown. However, the present invention is not limited to this, and may be applied to the rotor 26 having a different number of pole pairs.

In the first embodiment, the basic phase applied to the phase winding of the reference phase as the timing of applying a positive / negative voltage pulse pair for superimposing the harmonic component on the fundamental wave component flowing as a current in the reference phase. The phase of the rectangular wave voltage waveform for generating the wave component is a phase that is delayed by an electrical angle of 30 ° from the center of the on period (positive voltage center) or the center of the off period (negative voltage center) and is different from the reference phase. This is the start or end of the on period of the rectangular wave voltage waveform for generating the fundamental wave component applied to the winding. However, the present invention is not limited to this. The timing of applying the positive / negative voltage pulse pair may be a timing with an electrical angle of 30 ° to 60 ° behind the positive voltage center or negative voltage center of the reference phase. Since the power factor in the rotating electrical machine 20 is approximately 0.5 or more and the power factor angle is approximately 60 ° or less, the upper limit value of this electrical angle range is preferably set to 60 °.

In the first embodiment, the resonance frequencies f1 and f2 of the

resonance circuits

80 and 82 including the rotor field winding 44 and the capacitor 54 are defined as resonance frequencies. The resonance frequency of 20 flows in the rotor field winding 44 when the frequency of the harmonic component is changed while flowing the current in which the harmonic component is superimposed on the fundamental wave component in the stator armature winding 34. A frequency at which the excitation current or the torque generated by the excitation current exhibits a peak may be used (see FIG. 14).

[Embodiment 2]
The rotating electrical machine 20 according to the first embodiment includes two field winding portions 44-1 and 44-2 in which the rotor field windings 44 are connected in series, and these field windings. A single capacitor 54 having the other end connected to the connection point between the sections 44-1 and 44-2 is provided. On the other hand, in the rotary electric machine 100 according to the second embodiment of the present invention, as shown in FIG. 20, three field winding portions 44-1, 44- having the rotor field windings 44 connected in series are provided. 2 and 44-3, and the other end of each of the field winding portions 44-1, 44-2, 44-3 is connected to the corresponding one of the connection points of the field winding portions 44-1, 44-2, 44-3. Two capacitors 54-1 and 54-2 are provided.

The field winding portions 44-1, 44-2, 44-3 are appropriately replaced with the first field winding portion 44-1, the second field winding portion 44-2, and the third field winding portion. 44-3, and the capacitors 54-1 and 54-2 are referred to as a first capacitor portion 54-1 and a second capacitor portion 54-2. 20 and 21, the same components as those used in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted or simplified.

Each of the capacitors 54-1 and 54-2 has one end connected to the anode terminal of the rectifying element 52 and one end of the third field winding portion 44-3, and the other end connected to both ends of the rotor field winding 44. It is a capacitor connected between the two. The other end of the first capacitor unit 54-1 is connected to a connection point between the first field winding unit 44-1 and the second field winding unit 44-2. The other end of the second capacitor unit 54-2 is connected to a connection point between the second field winding unit 44-2 and the third field winding unit 44-3. The first capacitor unit 54-1 has a capacitance C1. The second capacitor unit 54-2 has a capacitance C2.

The first field winding portion 44-1 is connected between the cathode terminal of the rectifying element 52 and the other end of the first capacitor portion 54-1. The second field winding portion 44-2 is connected between the other end of the first capacitor portion 54-1 and the other end of the second capacitor portion 54-2. The third field winding portion 44-3 is connected in parallel to the second capacitor portion 54-2. In the first capacitor unit 54-1, the direction of the voltage generated at both ends of the first field winding unit 44-1 and the direction of the voltage generated at the second field winding unit 44-2 are opposite to each other. Thus, when both voltages cancel each other, it has a function of storing excitation energy corresponding to the canceling voltage. In the second capacitor unit 54-2, the direction of the voltage generated on the second field winding unit 44-2 side and the direction of the voltage generated on the third field winding unit 44-3 side are opposite to each other. Thus, when both voltages cancel each other, it has a function of storing excitation energy corresponding to the canceling voltage.

A connection point between the first field winding portion 44-1 and the second field winding portion 44-2, and the second field winding portion 44-2 and the third field winding portion 44-3. These connection points may be set so as to divide the rotor field winding 44 into portions that are easily affected by leakage magnetic flux and harmonic magnetic flux and portions that are difficult to receive. The first field winding portion 44-1 has an inductance L1. The second field winding portion 44-2 has an inductance L2. The third field winding portion 44-3 has an inductance L3.

As shown in FIG. 21, the first field winding portion 44-1, the second field winding portion 44-2, and the third field winding portion 44-3 are arranged in the radial direction of the salient pole portion 48. Arranged in order from the side close to 32. That is, the first field winding portion 44-1 is disposed closer to the stator core 32 (ie, radially outward) than the second field winding portion 44-2. The second field winding portion 44-2 is disposed on the side closer to the stator core 32 (that is, radially outside) than the third field winding portion 44-3.

In the rotary electric machine 100, four resonance circuits are provided by the three field winding portions 44-1 44-2 44-3 of the rotor field winding 44 and the two capacitors 54-1 54-2. It has been. That is, the first field winding portion 44-1 and the first capacitor portion 54-1 of the rotor field winding 44 constitute the first resonance circuit 102. The first resonance circuit 102 has a first resonance frequency f11. The first resonance frequency f11 is calculated according to the following equation (3) based on the inductance L1 of the first field winding portion 44-1 and the capacitance C1 of the first capacitor portion 54-1.

The second field winding portion 44-2 and the first capacitor portion 54-1 of the rotor field winding 44 constitute a second resonance circuit 104. The second resonance circuit 104 has a second resonance frequency f12. The second resonance frequency f12 is calculated according to the following equation (4) based on the inductance L2 of the second field winding portion 44-2 and the capacitance C1 of the first capacitor portion 54-1.

The second field winding portion 44-2 and the second capacitor portion 54-2 of the rotor field winding 44 constitute a third resonance circuit 106. The third resonance circuit 106 has a third resonance frequency f13. The third resonance frequency f13 is calculated according to the following equation (5) based on the inductance L2 of the second field winding portion 44-2 and the capacitance C2 of the second capacitor portion 54-2.

The third field winding portion 44-3 and the second capacitor portion 54-2 of the rotor field winding 44 constitute a fourth resonance circuit 108. The fourth resonance circuit 108 has a fourth resonance frequency f14. The fourth resonance frequency f14 is calculated according to the following equation (6) based on the inductance L3 of the third field winding portion 44-3 and the capacitance C2 of the second capacitor portion 54-2.

f11 = 1 / (2 × π × (L1 × C1) ^1/2 ) (3)
f12 = 1 / (2 × π × (L2 × C1) ^1/2 ) (4)
f13 = 1 / (2 × π × (L2 × C2) 1/2) ··· (5)
f14 = 1 / (2 × π × (L3 × C2) ^1/2 ) (6)

The inductance L1 of the first field winding portion 44-1 and the capacitance C1 of the first capacitor portion 54-1 are in a resonance relationship with the frequency of the harmonic component for exciting the rotor. Alternatively, the inductance L2 of the second field winding portion 44-2 and the capacitance C1 of the first capacitor portion 54-1 are in a resonance relationship with the frequency of the harmonic component. Alternatively, the inductance L2 of the second field winding portion 44-2 and the capacitance C2 of the second capacitor portion 54-2 are in a resonance relationship with the frequency of the harmonic component for exciting the rotor. Alternatively, the inductance L3 of the third field winding portion 44-3 and the capacitance C2 of the second capacitor portion 54-2 are in a resonance relationship with the frequency of the harmonic component.

That is, four resonance frequencies are provided corresponding to the four resonance circuits 102 to 108. At least one of the first resonance frequency f11, the second resonance frequency f12, the third resonance frequency f13, and the fourth resonance frequency f14 is equal to or close to the frequency of the harmonic component. The first resonance frequency f11, the second resonance frequency f12, the third resonance frequency f13, and the fourth resonance frequency f14 may be all equal to or near the frequency of the harmonic component. Good.

Further, the resonance frequency band may be expanded by setting the first resonance frequency f11 to the fourth resonance frequency f14 for each of the resonance circuits 102 to 108 to be different from each other. According to this configuration, the harmonic components can be easily matched to the resonance frequencies f11 to f14 of the resonance circuits 102 to 108. Further, in this case, when any two resonance frequencies of the four resonance frequencies f11 to f14 are approximated to each other and resonance occurs at a frequency between those two resonance frequencies, the frequency of the harmonic component is It may be between these two resonance frequencies, and according to this configuration, the harmonic component can be easily matched between the two resonance frequencies.

Thus, in a configuration in which at least one of the first resonance frequency f11, the second resonance frequency f12, the third resonance frequency f13, and the fourth resonance frequency f14 and the frequency of the harmonic component are in a resonance relationship, the resonance relationship Compared with a configuration that is not present, when a current in which a fundamental wave component and a harmonic component are superimposed flows in the stator armature winding 34, a field current induced in the rotor field winding 44 of each pole flows. It becomes easy. Therefore, according to the rotating electrical machine 100, the impedance at the time of excitation of the rotor field winding 44 can be reduced, and the excitation performance of the rotor field winding 44 can be improved. Torque ripple caused by wave components can be reduced.

[Embodiment 3]
The rotating electrical machine 100 according to the second embodiment includes the three field winding portions 44-1, 44-2, and 44-3 in which the rotor field windings 44 are connected in series. Two capacitors 54-1 and 54-2 each having the other end connected to a corresponding one of the connection points of the field winding portions 44-1, 44-2 and 44-3 are provided. Yes. In contrast, in the rotating electrical machine 200 according to the third embodiment of the present invention, as shown in FIG. 22, (n + 1) field winding portions 44-1 in which the rotor field windings 44 are connected in series. , 44-2,..., 44- (n + 1), and the field winding portions 44-1, 44-2,. , 54-n are provided with n capacitor portions 54-1, 54-2,..., 54-n each having the other end connected to the corresponding one. In addition, although n should just be an integer greater than or equal to 3, when including 1st Embodiment and 2nd Embodiment, it may be an integer greater than or equal to 1. In FIG. 22, the same components as those used in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted or simplified.

In the rotary electric machine 200, (n + 1) field winding portions 44-1 to 44- (n + 1) and n capacitor portions 54-1 to 54-n of the rotor field winding 44 are (2 × n) There are provided resonant circuits. That is, (n + 1) field winding portions 44-1 to 44- (n + 1) and n capacitor portions 54-1 to 54-n of the rotor field winding 44 are (2 × n). The resonance circuit is configured. The (n + 1) field winding portions 44-1 to 44- (n + 1) have inductances L1 to L (n + 1). The n capacitor units 54-1 to 54-n have capacitances C1 to Cn. At least one of the resonance frequencies of these (2 × n) resonance circuits is equal to or near the frequency of the harmonic component for exciting the rotor. Note that all (2 × n) resonance frequencies may be equal to or close to the frequency of the harmonic component.

Further, the resonance frequency band may be extended over a band having a predetermined width by setting the resonance frequencies for (2 × n) resonance circuits to be different from each other. According to this configuration, the harmonic component can be easily matched with the resonance frequency of any of the resonance circuits. Further, in this case, when any two resonance frequencies of (2 × n) resonance frequencies approximate each other to cause resonance even at a frequency between the two resonance frequencies, the frequency of the harmonic component May be between those two resonance frequencies, and according to this configuration, the harmonic component can be easily matched between the two resonance frequencies.

Thus, in the configuration in which the resonance frequency of the resonance circuit and the frequency of the harmonic component are in a resonance relationship, the fundamental wave component and the harmonic component are superimposed on the stator armature winding 34 as compared with the configuration in which the resonance circuit does not have a resonance relationship. When the current flows, the field current induced in the rotor field winding 44 of each pole becomes easy to flow. Therefore, also in the rotating electric machine 200, the impedance at the time of excitation of the rotor field winding 44 can be reduced and the excitation performance of the rotor field winding 44 can be improved. Torque ripple caused by components can be reduced.

[Others]
By the way, in the first embodiment, the first field winding portion 44-1 connected between the cathode terminal of the rectifying element 52 and the other end of the capacitor 54 has the radial direction of the salient pole portion 48. And the second field winding portion 44-2 connected in parallel to the capacitor 54 is disposed on the side far from the stator core 32 in the radial direction of the salient pole portion 48. . That is, the first field winding portion 44-1 is disposed closer to the stator core 32 (that is, radially outside) than the second field winding portion 44-2. However, the present invention is not limited to this, and conversely, the first field winding portion 44-1 is disposed on the side far from the stator core 32 in the radial direction of the salient pole portion 48, and the second field The magnetic winding portion 44-2 may be disposed on the side closer to the stator core 32 in the radial direction of the salient pole portion 48. That is, the first field winding portion 44-1 may be disposed on the side farther from the stator core 32 (that is, radially inward) than the second field winding portion 44-2. In the second embodiment and the third embodiment, the same configuration can be applied.

[Modification 1]
The magnetic flux flowing in the field pole has a leakage magnetic flux, but the leakage magnetic flux has a magnetic flux flowing between the stator 24 and the rotor 26 without passing through the salient pole portion 48 which is the main magnetic pole. May be disturbed.

Therefore, in the rotating electrical machine 300 according to the first modified embodiment, as shown in FIG. 23, the rotor core 42 includes a boss portion 46 and a plurality of salient pole portions 48, and further includes a plurality of auxiliary pole portions 302. is doing. The salient pole portion 48 is a main pole that forms a field pole (specifically, an N pole and an S pole). Each auxiliary pole portion 302 is provided between the pair of salient pole portions 48. The auxiliary pole portions 302 are arranged at predetermined intervals so as to be alternately arranged with the salient pole portions 48 in the circumferential direction. The auxiliary pole portion 302 is an auxiliary pole that is installed to provide a boundary between the salient pole portions 48 that are adjacent in the circumferential direction, and is a portion that protrudes radially outward from the boss portion 46. In FIG. 23, the same components as those used in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted or simplified.

The auxiliary pole portion 302 may have a smaller circumferential width than the salient pole portion 48, and there is a gap between the tip of the auxiliary pole portion 302 and the tip of the teeth 40 of the stator core 32. The air gap between the tip of the salient pole portion 48 and the tooth 40 may be larger.

The rotating electrical machine 300 includes a magnet 304 provided in the auxiliary pole portion 302. The magnet 304 is magnetized in a direction that cancels out the leakage magnetic flux that flows between the stator 24 and the rotor 26 between the salient pole portions 48 (or is arranged so as to be magnetized in such a direction). The magnet 304 is embedded in the auxiliary pole portion 302 such that, for example, the N pole is disposed on the radially inner side of the auxiliary pole portion 302 and the S pole is disposed on the radially outer side thereof. The magnet 304 has a function of suppressing magnetic flux leakage between the salient pole portions 48 across the stator 24 side and the rotor 26 side.

In the structure of the rotating electric machine 300, the magnet 304 provided in the auxiliary pole portion 302 suppresses the magnetic flux from flowing between the stator 24 and the rotor 26 without passing through the salient pole portion 48 (main magnetic pole). Can do. Therefore, according to the rotating electrical machine 300, the magnetic flux flowing through the field pole can be efficiently passed through the main pole, and a field current can be obtained effectively.

The magnet 304 may be a permanent magnet, but may be an electromagnet. In this case, the auxiliary pole portion 302 is provided with a winding that generates a magnetic flux in a direction that cancels out the leakage magnetic flux from the stator 24 to the rotor 26.

[Modification 2]
In the above-described embodiments and modifications, a plurality of field winding portions connected in series with the rotor field winding 44 are arranged side by side in the radial direction of the salient pole portion 48. However, the present invention is not limited to this, and a plurality of field winding portions connected in series with the rotor field winding 44 may be arranged side by side in the circumferential direction of the salient pole portion 48. That is, in the rotating electrical machine 400 according to the second modification, as shown in FIG. 24, the first field winding portion 44- connected between the cathode terminal of the rectifying element 52 and the other end of the capacitor 54. 1 is disposed on the side close to the salient pole portion 48 of the rotor core 42 in the circumferential direction, and the second field winding portion 44-2 connected in parallel to the capacitor 54 has a projection of the rotor core 42 in the circumferential direction. It may be arranged on the side far from the pole part 48. That is, the first field winding portion 44-1 may be disposed closer to the salient pole portion 48 of the rotor core 42 than the second field winding portion 44-2. In FIG. 24, the same components as those used in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted or simplified.

The arrangement of the first field winding portion 44-1 and the second field winding portion 44-2 is, for example, that the first field winding portion 44-1 is wound around the salient pole portion 48 of the rotor core 42. Then, the second field winding portion 44-2 may be wound around the outer side in the circumferential direction of the first field winding portion 44-1. The first field winding portion 44-1 and the second field winding portion 44-2 are obtained by dividing one winding with the connection position of the other end of the capacitor 54 as a boundary. Alternatively, two separate windings may be connected at the connection position with the other end of the capacitor 54.

For this reason, in the structure of the rotating electric machine 400, the difference in the amount of magnetic flux generated between the side close to the salient pole portion 48 of the rotor field winding 44 (ie, the main magnetic pole side) and the side far away (ie, the side between the main magnetic poles). As a result, the energy stored in the capacitor 54 can be increased, and a field current can be obtained effectively.

In the second modification, the first field winding portion 44-1 is disposed closer to the salient pole portion 48 of the rotor core 42 than the second field winding portion 44-2. . However, the present invention is not limited to this, and conversely, the first field winding portion 44-1 is disposed on the side far from the salient pole portion 48 of the rotor core 42 in the circumferential direction, and the second field The magnetic winding portion 44-2 may be disposed on the side close to the salient pole portion 48 of the rotor core 42 in the circumferential direction. That is, the first field winding portion 44-1 may be arranged on the side farther from the salient pole portion 48 of the rotor core 42 than the second field winding portion 44-2.

[Modification 3]
Moreover, in said 2nd modification, the magnet provided in the auxiliary pole part and its auxiliary pole part which were shown in the said 1st modification is not provided. On the other hand, in the rotating electrical machine 500 according to the third modified embodiment, the rotor core 42 includes the auxiliary pole portion 502 similar to the auxiliary pole portion 302 of the first modified embodiment, and the first It is good also as what has the magnet 504 similar to the magnet 304 of a deformation | transformation form. In FIG. 25, the same components as those used in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted or simplified. In this structure, the magnet 504 provided in the auxiliary pole portion 502 can suppress the magnetic flux from flowing between the stator 24 and the rotor 26 without passing through the salient pole portion 48 (main magnetic pole). The magnetic flux flowing through the field pole can be efficiently passed through the main pole, and a field current can be obtained effectively.

The magnet 504 may be a permanent magnet or an electromagnet. In this case, the auxiliary pole portion 502 is provided with a winding that generates a magnetic flux in a direction that cancels out the leakage magnetic flux from the stator 24 to the rotor 26.

[Modification 4]
In the above-described embodiments and modifications, no capacitor is connected in parallel to the rectifying element 52 provided in the rotating electrical machine 20. On the other hand, in the rotating electrical machine 600 according to the fourth modification, a capacitor 602 is connected in parallel to the rectifying element 52 as shown in FIG. In FIG. 26, the same components as those used in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted or simplified. Capacitor 602 has a function of smoothing the AC voltage induced in rotor field winding 44 and half-wave rectified by rectifying element 52 to reduce pulsation. According to the rotating electric machine 600 provided with the capacitor 602, the AC voltage half-wave rectified by the rectifying element 52 can be smoothed, and the pulsation can be reduced.

[Modification 5]
In the above-described embodiments and variations, a capacitor 54 is provided, one end of which is connected to the anode terminal of the rectifying element 52 and the other end connected between both ends of the rotor field winding 44. . On the other hand, the rotating electrical machine 700 according to the fifth modification includes a capacitor 702 instead of the capacitor 54 in the first embodiment. As shown in FIG. 27, the capacitor 702 has one end connected to the cathode terminal of the rectifying element 52 and the other end connected between both ends of the rotor field winding 44.

The rotor field winding 44 includes a first field winding portion 44-1 connected between the anode terminal of the rectifying element 52 and the other end of the capacitor 702, and a first connected to the capacitor 702 in parallel. 2 field winding portion 44-2. Capacitor 702 is configured such that the direction of the voltage generated at both ends of first field winding portion 44-1 and the direction of the voltage generated at both ends of second field winding portion 44-2 are opposite to each other. When the voltages are in the direction of canceling each other, it has a function of storing energy corresponding to the canceling voltage.

In such a rotating electric machine 700, the first field winding portion 44-1 and the second field winding portion 44-2 have directions in which the directions of voltages are opposite to each other and the two voltages cancel each other. These voltages are applied so that current flows through the field winding portions 44-1 and 44-2 from the connection portion side to the rectifying element 52 to the connection portion side to the other end of the capacitor 702 ( Pattern 2), the current that flows through each of the field winding portions 44-1 and 44-2 flows toward the capacitor 702. In this case, excitation energy corresponding to the voltage canceling each other between the first field winding portion 44-1 and the second field winding portion 44-2 is stored in the capacitor 702, and the capacitor 702 is charged. .

After the capacitor 702 is charged, the voltage direction of the first field winding portion 44-1 and the voltage direction of the second field winding portion 44-2 are switched, and these voltages cancel each other out. When the field winding portions 44-1 and 44-2 are applied so that current flows from the connection portion side to the other end of the capacitor 702 to the connection portion side to the rectifying element 52 (pattern 3), the capacitor A current flows from the 702 side to each of the field winding portions 44-1 and 44-2. In this case, the energy stored in the capacitor 702 is discharged to the field winding portions 44-1 and 44-2, and the capacitor 702 is discharged. Then, charging and discharging of the capacitor 702 are repeated.

Therefore, also in the rotating electrical machine 700, when a voltage in a direction canceling each other is generated in each field winding portion 44-1 and 44-2 of the rotor field winding 44, the excitation generated in the rotor field winding 44 is generated. A field current can be secured by efficiently converting energy into an excitation current. For this reason, it is possible to prevent the occurrence of excitation energy loss due to a decrease in excitation current when a voltage in a direction canceling each other is generated in each field winding portion 44-1 and 44-2 of the rotor field winding 44. Thus, even if the voltages cancel each other, the rotor core 42 can be excited efficiently, and the same effect as in the first embodiment can be obtained.

Further, the configuration of the fifth modification can also be applied to the rotating electrical machine 100 shown in FIG. 20 of the second embodiment and the rotating electrical machine 200 shown in FIG. 22 of the third embodiment. That is, one end of each capacitor portion of the rotating

electrical machines

100 and 200 may be connected to the cathode terminal of the rectifying element 52, and the other end may be connected between both ends of the rotor field winding 44.

In the second and third embodiments and the modifications described above, the frequency of the harmonic component superimposed on the fundamental wave component is changed from low to high rotation of the rotating electrical machine, as in the first embodiment. Thus, it is desirable that the excitation current obtained in the rotor field winding and the torque of the rotating electrical machine be equal to or greater than a predetermined value to be within a predetermined frequency range including the resonance frequency. Further, in this case, in order to generate a harmonic component in the rectangular wave control region and induce an exciting current in the rotor field winding, a positive / negative voltage pulse pair in adjacent two phases as in the first embodiment. What is necessary is just to perform the harmonic generation process which applies.

Furthermore, in the above-described embodiments and modifications, the rotor field winding 44 is intensively wound for each salient pole portion 48. However, the present invention is not limited to this, and may be applied to a structure in which the rotor field winding 44 is distributed and wound around several salient pole portions 48.

Further, in the above-described embodiments and modifications, the capacitor may be a capacitor in which a plurality of capacitors are connected in series, in parallel, or in both series and parallel. A ceramic capacitor is suitable for the capacitor.

Note that the present invention is not limited to the above-described embodiments and modifications, and various modifications can be made without departing from the spirit of the present invention.

20, 100, 200, 300, 400, 500, 600, 700: Field winding type rotating electrical machine, 24: Stator, 26: Rotor, 32: Stator core, 34: Stator armature winding, 42: Rotor core, 44: Rotor Field winding, 44-1: first field winding section, 44-2: second field winding section, 44-3: third field winding section, 52: rectifying element, 54: capacitor, 54-1: first capacitor unit, 54-2: second capacitor unit, 60: inverter circuit, 72: control circuit, 80, 82, 102, 104, 106, 108: resonance circuit, L1, L2, L3: inductance , C, C1, C2: capacity.

Claims

A stator armature winding (34) wound around the stator core (32);
Rotor field windings (44, 44-1, 44-2, 44-3) wound around the rotor core (42);
A rectifying element (52) connected to both ends of the rotor field winding;
A capacitor (54, 54-1, 54-2) having one end connected to one end of the rectifying element and the other end connected between both ends of the rotor field winding;
The rotor field winding is excited by flowing a current in which a fundamental wave component for generating rotational torque in the stator armature winding and a harmonic component having a cycle shorter than that of the fundamental wave component are passed. A control circuit (72) for inducing current;
With
The field winding type rotary electric machine, wherein the inductance of the rotor field winding and the capacitance of the capacitor are in a resonance relationship with the frequency of the harmonic component.
2. The field winding type rotating electrical machine according to claim 1, wherein the harmonic component is amplitude-adjusted using a standing wave having a half cycle with respect to the fundamental component as an envelope.
The rotor field winding is connected in parallel to the capacitor and a first field winding portion (44-1) connected between the other end of the capacitor and the other end of the rectifying element. A second field winding portion (44-2),
At least one of the first resonance frequency based on the inductance of the first field winding portion and the capacitance of the capacitor, and at least one of the second resonance frequency based on the inductance of the second field winding portion and the capacitance of the capacitor, The field according to claim 1 or 2, wherein the field is within a predetermined frequency range including the frequency of the harmonic component, or the frequency of the harmonic component is between the first resonance frequency and the second resonance frequency. Magnetic winding type rotating electrical machine.
The rotor field winding has a plurality of field winding portions (44-1, 44-2, 44-3) connected in series,
Each of the capacitors has a plurality of capacitor portions (54-1, 54) each having one end connected to one end of the rectifying element and the other end connected to a corresponding one of the connection points of the field winding portions. -2)
A plurality of resonant circuits (102, 104, 106, 108) are provided by the plurality of field winding portions and the plurality of capacitor portions,
At least one of the resonance frequencies of the resonance circuit is within a predetermined frequency range including the frequency of the harmonic component, or the frequency of the harmonic component is the resonance frequency of any two of the resonance circuits. The field winding type rotating electrical machine according to claim 1 or 2, which is in between.
The field winding type rotary electric machine according to claim 4, wherein the resonance frequencies of the resonance circuits are different from each other.
The frequency of the harmonic component superimposed on the fundamental wave component is within a predetermined frequency range including a resonance frequency based on an inductance of the rotor field winding and a capacitance of the capacitor from a low rotation to a high rotation. Item 6. The field winding rotary electric machine according to any one of Items 1 to 5.
The field winding type rotating electric machine according to claim 6, wherein the predetermined frequency range is a range in which an excitation current or torque induced in the rotor field winding is a predetermined value or more.
The stator armature winding is composed of a three-phase phase winding,
The control circuit induces an excitation current in the rotor field winding in a rectangular wave control region, and a center of an on period of the rectangular wave voltage waveform for generating the fundamental wave component applied to one phase winding. For turning off the rectangular wave voltage waveform for generating a fundamental wave component applied to one of the other two phases at a timing delayed by an electrical angle of 30 ° to 60 ° for a predetermined period. A first negative voltage pulse is added and paired with the first negative voltage pulse during an off period of the rectangular wave voltage waveform for generating the fundamental wave component applied to the other phase winding of the other two phases. A first positive voltage pulse for turning on only for a predetermined period is added, or an electrical angle of 30 ° to 60 ° from the center of the off period of the rectangular wave voltage waveform for generating the fundamental wave component applied to one phase winding. One phase winding of the other two phases at a delayed timing The second positive voltage pulse for turning on for a predetermined period is added to the off period of the rectangular wave voltage waveform for generating the fundamental wave component to be applied, and the other two phases are applied to the other phase winding. The field according to claim 6 or 7, wherein a second negative voltage pulse for turning off only for a predetermined period paired with the second positive voltage pulse is added to an on period of a rectangular wave voltage waveform for generating a fundamental wave component. Winding type rotating electrical machine.
The control circuit is configured to add both of the first negative voltage pulse and the first positive voltage pulse and the addition of the second positive voltage pulse and the second negative voltage pulse with reference to one phase winding. When the two-phase winding is used as a reference, the excitation by the rotor field winding is performed six times at regular intervals per control cycle, or the first winding using the one-phase winding as a reference. The addition of one negative voltage pulse and the first positive voltage pulse and the addition of the second positive voltage pulse and the second negative voltage pulse are also performed when the other two-phase phase winding is used as a reference. The field winding type rotating electrical machine according to claim 8, wherein excitation by the rotor field winding is performed three times at regular intervals per control cycle.
The stator armature winding is composed of a three-phase phase winding,
The control circuit induces an excitation current in the rotor field winding in a rectangular wave control region, and starts an on period of a rectangular wave voltage waveform for generating the fundamental wave component applied to one phase winding. Is applied with a first negative voltage pulse for turning off for a predetermined period, and the first negative voltage pulse is applied to any one of the other phase windings during the off period of the rectangular wave voltage waveform for generating the fundamental wave component. A first positive voltage pulse for turning on only for a predetermined period paired with the voltage pulse is added, or at the end of an on period of the rectangular wave voltage waveform for generating the fundamental wave component applied to one phase winding. A second positive voltage pulse for adding the ON period for a predetermined period is added, and the second waveform is applied during the ON period of the rectangular wave voltage waveform for generating the fundamental wave component applied to any one of the other phase windings. 2 Turns off for a predetermined period paired with a positive voltage pulse Performing a first harmonic generation process that adds a second negative voltage pulse because, field winding type rotary electric machine according to claim 6 or 7, wherein.
The control circuit performs excitation by the rotor field winding by performing the first harmonic generation process for each of the three-phase windings at both the start and end timings of the on-period of the rectangular wave voltage waveform. The field winding type rotating electrical machine according to claim 10, wherein the field winding type rotating electrical machine is performed six times at equal intervals per control cycle.
The control circuit performs the first harmonic generation process for each of the three-phase phase windings at the timing of either the start end or the end of the on-period of the rectangular wave voltage waveform. The field winding type rotating electrical machine according to claim 10, wherein excitation is performed three times at regular intervals per control cycle.
The control circuit induces an excitation current in the rotor field winding in a rectangular wave control region, and the rectangular wave voltage for generating the fundamental wave component applied to two phase windings adjacent to each other in the circumferential direction. The field winding type rotation according to claim 8 or 10, wherein addition of a positive / negative voltage pulse pair to the waveform is performed four times at equal intervals per control period, and an average value of applied voltage per one phase and one control period is set to zero. Electric.
The control circuit performs the first harmonic generation process at the timing of both the start and end of the rectangular wave voltage waveform in a predetermined phase winding, and the start and end of the rectangular wave voltage waveform in the predetermined phase winding A second pair of positive and negative voltage pulse pairs is added to the rectangular wave voltage waveform for generating the fundamental wave component applied to the two phase windings adjacent to each other in the circumferential direction at a timing separated from each timing by an electrical angle of 90 °. The field winding type rotating electrical machine according to claim 10, wherein excitation by the rotor field winding is performed four times at regular intervals per control cycle by performing harmonic generation processing.
The field winding type rotating electrical machine according to any one of claims 8 to 14, wherein an additional frequency of the voltage pulse by the control circuit is within the predetermined frequency range.