JP5157372B2 - Multi-phase rotating electrical machine control device and multi-phase rotating electrical machine device - Google Patents

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a current detection technique for a control device for a multiphase rotating electrical machine, and more particularly to a control device for a multiphase rotating electrical machine using a neutral point that connects a power source to a neutral point of a star-connected multiphase stator coil. And the current detection method. The control device configuration and current detection method of the multi-phase rotating electrical machine according to the present invention are particularly applied to in-vehicle motors such as a drive motor for an electric power steering system for an automobile, a motor used in a hybrid system, and a drive motor for an electric compressor. Can be applied.

  As a current detection method for a control device of a conventional multiphase rotating electrical machine, a method for detecting the current of each lower arm switch (or each upper arm switch) of an inverter is known as a simple method that does not require a Hall element. ing. For example, in order to detect the current of each lower arm switch, the main electrode terminal on the low potential side of each lower arm switch is connected to the low potential power supply terminal through the shunt resistor, and the voltage drop of this shunt resistor causes this lower arm switch to The current flowing through the switch (including the flywheel diode) can be detected. In addition, a current detection function may be provided in the semiconductor switching element forming each lower arm switch, and a current or a signal having a correlation therewith may be detected from the current detection terminal of the lower arm switch. Hereinafter, the above-described current detection method for detecting the arm current of each phase of the inverter will be simply referred to as an arm current detection method.

  A PWM control method is known in conventional inverter control. In this PWM control method, a voltage vector V of a certain phase is obtained by using the time of two voltage vectors on both sides of the voltage vector V among the effective voltage vectors V1 to V6 indicating different internal states of the three-phase inverter, and the zero voltage vector. Is set by the time of the voltage vectors V0 and V7.

  In the above-described arm current detection method, it is important to simultaneously detect the currents of the arms of each phase. Since the voltage vector V0 is a period during which all the lower arm switches of the inverter are turned on, in the arm current detection method, the current of each lower arm is detected by the arm current detection method in the V0 period that is the period of the voltage vector V0. It is known (Patent Document 1). Furthermore, in Patent Document 1, when the V0 period becomes short and current detection becomes difficult, two-phase currents are detected in V1, V3, and V5, and the sum of the three-phase currents is zero. In addition, reference is also made to a method of detecting the remaining one-phase current.

  In addition, as a method for supplying power to a conventional control device for a multiphase rotating electrical machine, a method of connecting a power source terminal to the neutral point of a star-connected stator coil has been proposed (Patent Document 2). As a similar method, in addition to a method of connecting a power source between the neutral point and the low potential end (high potential end) of the inverter, a method of connecting a power source between the neutral points of two stator coils Has also been proposed (Patent Document 3).

  In the method using these neutral points, power is exchanged between the first power source and the second power source using the V0 period and the V7 period. In particular, in the configuration described in Patent Document 2, magnetic energy can be stored in the stator coil when the lower arm switch of the inverter is fully on, and the magnetic energy is supplied to the first power source when the upper arm switch of the inverter is fully on. Is fed. For example, when the first power source is an electrolytic capacitor and the second power source is a DC power source, magnetic energy is accumulated in the stator coil when the lower arm switch of the inverter is fully turned on, and when the upper arm switch of the inverter is fully turned on. Since the magnetic energy of the coil is fed to the electrolytic capacitor, the voltage of the electrolytic capacitor can be increased with respect to the voltage of the DC power supply. In the PWM control described above, by changing the ratio between the period of the zero voltage vector V0 and the period V7 which is the period of the zero voltage vector V7, the ratio (that is, the step-up ratio) of the storage voltage of the storage means to the DC power supply voltage is changed. Can be adjusted. In addition, when the first power source is a battery, the battery can be charged by the second power source by adjusting the ratio between the V0 period and the V7 period.

However, even if the step-up ratio is increased to increase the storage voltage of the storage means, this high storage voltage cannot be effectively used if each phase voltage command (phase voltage command amplitude Vs) of the inverter is small. Therefore, in Patent Document 4 below, the inverter outputs when the DC power supply voltage (also referred to as battery voltage) Vb applied to the neutral point is smaller than half of the stored voltage (also referred to as capacitor voltage) Vc of the storage means. When the amplitude of the AC phase voltage, that is, the phase voltage command amplitude Vs is limited to less than twice the battery voltage Vb, and the battery voltage Vb is greater than half of the capacitor voltage Vc, the phase voltage falls within the range of 2 (Vc−Vb). It has been proposed to effectively use the boost voltage by limiting the command amplitude Vs and bringing the boost ratio close to 2. That is, Patent Document 2 proposes to improve efficiency by adopting a configuration in which the voltage is boosted by a necessary amount.
Also, when the first power source is a battery, it is necessary to adjust the V0 period and the V7 period so as not to overcharge.
Patent 2712470 Patent 3223842 Patent 3721116 JP2002-291256

  However, when the above-described PWM control is applied to a control device for a multi-phase rotating electrical machine using a neutral point, and the current of each arm of the inverter is detected during the V0 period, the motor rotational speed is high, and When the phase voltage command amplitude Vs is increased and the effective voltage vector output period is increased, the V0 period is reduced. As a result, the current detection accuracy of each arm of the inverter is lowered, and further, the current is detected in a high rotation range. It turned out that there was a problem that could not. Hereinafter, this problem will be described with reference to FIGS.

  FIG. 7 is a circuit diagram showing a three-phase inverter control motor device using a neutral point feeding method. Reference numeral 1 is a stator coil, 2 is an inverter, 31 to 33 are shunt resistors, 4 is a battery, and 5 is a capacitor. The shunt resistors 31 to 33 are individually connected in series with the lower arm switches 24 to 26 of the inverter 2. 21-23 are upper arm switches of the inverter. The thick line shows the current flow in the V0 period. At a predetermined sampling point in the V0 period, the voltage drop of the shunt resistors 31 to 33 is sampled and held, converted into a digital signal, and used for control. Sampling timing is shown in FIG.

  100 shows a gate voltage waveform of the lower arm switch 24 in the V0 period, and 101 shows a schematic waveform of the U-phase lower arm current in the V0 period. Since a vibration waveform (ringing) due to resonance due to wiring inductance or parasitic capacitance occurs with the start of the V0 period, the voltage drop sample hold of the shunt resistors 31 to 33 has passed a predetermined ringing attenuation period Δt from the start of the V0 period. Need to be done later. Δt is a time required for ringing to sufficiently attenuate, and is set to, for example, about 4.5 μsec.

  However, if the V0 period is shortened to improve efficiency as described above, this ringing decay period t3 cannot be secured, and as a result, the currents of the lower arm switches 24-26 of the inverter are accurately determined. When the current feedback control is performed based on the inaccurate current detection value, the torque command value and the actually generated torque are deviated, and the control is greatly disturbed.

  In addition, because in-vehicle motors have large ringing and current ripple when the arm switch is turned on, especially due to size and space constraints, extending the arm switch ON time in areas other than high-speed rotation improves current detection accuracy. Is effective.

(Object of invention)
The present invention has been made in view of the above problems, and an object of the present invention is to provide a motor device capable of detecting a motor current with a simple configuration with high accuracy and in a wide operating range.

(Summary of the Invention)
In order to achieve the above object, the present invention provides a high-potential terminal and a low-potential of a multi-phase inverter for driving a multi-phase rotating electrical machine having an upper arm switch and a lower arm switch controlled for switching for each phase. A first power source connected to the end; current detecting means for detecting at least one of phase currents flowing through the upper arm switch and the lower arm switch of the inverter; one end at a neutral point of the multiphase rotating electrical machine; and the other end Is provided in a rotating electrical machine apparatus including a second power source connected to the high potential terminal or the low potential terminal of the inverter, and controls the inverter based on the detected phase current. In the apparatus, at least one of a period during which all the upper arm switches of each phase of the inverter are ON and a period during which all the lower arm switches of each phase are ON is reduced. It is characterized in that it is extended for a predetermined time ΔT during high-speed rotation of at least a predetermined value, and the current on the arm side that has been extended for the period is detected.
That is, according to the present invention, the storage voltage of the storage means is set to a predetermined target value by adjusting the voltage vector V7 for turning on all the upper arm switches and the voltage vector V0 (or V7) for turning on all the lower arm switches. In addition to performing the boost control to be adjusted, the period of the arm on the current detection side of the upper arm side and the lower arm side of the inverter in the V0 (or V7) period in which the zero voltage vector V0 (or V7) is output is extended. That is what it is.

  For example, according to the present invention, in the control of a multi-phase rotating electrical machine using a neutral point that transfers power between a first power supply and a second power supply using the V0 period and the V7 period, However, the current detection accuracy and range are improved by adjusting the V0 and V7 periods so that the current flowing through the current detection element becomes longer than a predetermined minimum value.

  In other words, a multiphase rotating electrical machine that connects a second power source to the neutral point of a star-connected stator coil and transfers power to and from the second power source connected to the high potential end and the low potential end of the inverter. When PWM control is performed on the control device, the current detection accuracy is reduced or the detection itself cannot be performed even though the V0 period, which is the period of the zero voltage vector V0, is adjusted based on the required amount of power movement. The V0 and V7 periods are adjusted so that the period during which the motor current flows through the current detection element becomes longer. For example, when there is a current detection element in the lower arm, the V0 period is set to be widened without changing the effective value voltage that contributes to the torque applied to the motor.

  In this way, more power than necessary is exchanged between the first and second power supplies, but the current value is supplied to the lower arm, for example, in the lower arm without changing the effective voltage contributing to the torque applied to the motor. When the detection element is connected, the V0 period in which current can be detected can be extended. Note that, by extending the above-described V0 period, for example, when the first power source is a capacitor, the voltage is boosted more than necessary, and the efficiency is reduced. However, the merit of improving the current detection accuracy is much higher than the demerit. Therefore, a good inverter control motor device as a whole can be realized. For the efficient step-up ratio, see the description in Patent Document 4 above.

  In a preferred embodiment, the predetermined time Δt, which is the sampling delay time from the start time of the V0 period to the sampling time, is such that the amplitude of the ringing of the current of the lower arm switch immediately after the start of energization of the lower arm switch is less than 10% of the maximum value. It is set to a decayable period. Thereby, it is possible to satisfactorily suppress a decrease in current detection accuracy due to the ringing of the current of the lower arm switch due to the lower arm switch being turned on. Naturally, in this case, the predetermined minimum threshold time in the V0 period is the sum of the sampling delay time (ringing decay period) t3 and the time required for sampling.

  In a preferred embodiment, the current detection means has resistance elements (so-called shunt resistors) corresponding to the number of phases individually connected in series with the lower arm switches of all phases of the inverter. In this way, the current of the lower arm of each phase of the inverter can be detected with high accuracy.

  In a preferred embodiment, the current detection means includes a two-phase resistance element individually connected in series with the lower arm switches of the two phases of the three-phase inverter, and a line for detecting the current of the low-potential power supply bus of the inverter And a connection resistance element. In this way, the current of the lower arm of each phase of the three-phase inverter can be detected with high accuracy based on the detected three current values. Further, overcurrent or failure can be determined based on the detected current. In addition, by having a relay between the second power supply and the multi-phase rotating electrical machine or inverter, in the event of an overcurrent or failure determination, the power supply and the control device for the multi-phase rotating electrical machine are disconnected to avoid affecting other equipment. it can. As the relay, a mechanical relay may be a semiconductor relay.

  In a preferred embodiment, the current detection means includes a resistance element for the number of phases individually connected in series with the lower arm switches of all phases of the inverter, and a line connection resistance element for detecting the current of the low-potential power supply bus of the inverter. Have

  If it does in this way, the current of the lower arm of each phase of a three-phase inverter can be detected accurately by detecting these four currents. Even if one current detection system fails, the remaining three current detection systems can be used to accurately detect the current of the lower arm of each phase of the three-phase inverter. In addition, it is possible to determine overcurrent or failure based on the current of the line connection resistance element.

  In addition, by having a relay, when an overcurrent or failure is determined, the power supply and the control device for the multiphase rotating electrical machine can be disconnected to avoid influence on other devices. As the relay, a mechanical relay may be a semiconductor relay.

  In a preferred embodiment, the present invention provides a motor having a multi-phase stator coil to which a DC power supply voltage is applied to a neutral point, and an inverter having a multi-phase output terminal individually connected to each phase terminal of the stator coil. Power storage means for connecting the high potential end and the low potential end of the inverter, a control device for intermittently controlling the upper arm switch and the lower arm switch of each phase of the inverter, the lower arm side and the upper side of the inverter Current detecting means for detecting at least one current on the arm side, and the control device includes the upper arm switch and the upper arm switch based on a combination of voltage vectors corresponding to output states of the multiphase output terminals of the inverter. In the multiphase rotating electrical machine apparatus that changes the intermittent control mode of the lower arm switch, the control device is configured to turn on all upper arm switches. By adjusting the voltage V7 and the voltage vector V0 that turns on all the lower arm switches, the boost voltage control for adjusting the storage voltage of the storage means to a predetermined target value is performed, and the zero voltage vector V0 (or V7) is output. The V0 (or V7) period to be set is set so as not to fall below at least the predetermined minimum threshold time, and the sampling time is delayed by a predetermined time Δt from the start time of the set V0 (or V7) period. The detection current value of the current detection means is detected.

  That is, the present invention is in the control of a multiphase rotating electrical machine using a neutral point that transfers power between the first power supply and the second power supply using the V0 period and the V7 period. The V0 period and the V7 period are adjusted so that the period during which the motor current flows through the current detection element is increased, thereby improving the current detection accuracy and range. Control of a multi-phase rotating electrical machine that connects a second power source to the neutral point of a star-shaped stator coil and transfers power to and from the second power source connected to the high potential end and low potential end of the inverter When PWM control is performed on the device, the accuracy of current detection is reduced even though the V0V0 (or V7) period, which is the period of the zero voltage vector V0V0 (or V7), is adjusted based on the required amount of power transfer. When the detection itself is not possible, adjust the V0 and V7 periods so that the period during which the motor current flows through the current detection element becomes longer. For example, when there is a current detection element in the lower arm, the V0 (or V7) period is set to be extended without changing the effective value voltage that contributes to the torque applied to the motor.

  In this way, more power than necessary is exchanged between the first and second power supplies, but the current value is supplied to the lower arm, for example, in the lower arm without changing the effective voltage contributing to the torque applied to the motor. When the detection element is connected, the V0 (or V7) period in which current can be detected can be extended. Note that, by extending the above-described V0 (or V7) period, for example, when the first power supply is a capacitor, the voltage is boosted more than necessary, and the efficiency is reduced. However, the merit of improving the current detection accuracy is more than the demerit. Since this is much larger, a good inverter control motor device can be realized as a whole. For the efficient step-up ratio, see the description in Patent Document 4 above.

  A preferred embodiment of the motor device of the present invention will be described below with reference to the drawings.

(Circuit configuration)
The inverter control motor apparatus of Embodiment 1 is demonstrated with reference to FIG. FIG. 1 is a circuit diagram illustrating a neutral-phase power feeding type three-phase inverter control motor device. 1 is a stator coil of a three-phase motor, 2 is a three-phase inverter comprising upper arm switches 21 to 23 and lower arm switches 24 to 26, 3 is a current detecting means comprising shunt resistors 31 to 33, and 4 is a battery. (DC power supply) 5 is a capacitor (electric storage means), 6 is a controller (control device) incorporating a microcomputer, and the upper arm switches 21 to 23 and the lower arm switches 24 to 26 of the inverter 2 are intermittently controlled to be stator coils. An AC voltage component is output to each phase coil of 1 and the stored voltage of the capacitor 5 is adjusted according to the amplitude of the AC voltage component.

  The upper arm switches 21 to 23 and the lower arm switches 24 to 26 constituting the inverter 2 are constituted by MOSTFETs in which parasitic diodes form flywheel diodes in this embodiment, but it is of course not limited thereto. The shunt resistors 31 to 33 are individually connected in series with the lower arm switches 24 to 26 of the inverter 2. 21-23 are upper arm switches of the inverter. The capacitor 5 is connected between the high potential end (high potential side power supply bus) and the low potential end (low potential side power supply bus) of the inverter. Preferably, the capacitor 5 is an electrolytic capacitor and is used without polarity reversal. The thick line shows the current flow in the V0 period.

  The shunt resistors 31 to 33 constituting the current detection means 3 detect the lower arm current of each phase. The control device 6 performs known vector control by comparing the current detection values Id 'and Iq' obtained from the detected currents detected with the current command values Id 'and Iq' calculated from the torque command values.

(PWM modulation operation)
The operation of the inverter 2 will be described below.

  The sine wave formation by PWM modulation of the inverter 2 is performed by a method well known to those skilled in the art. This method will be briefly described. The switch state of the inverter 2 is indicated by six effective voltage vectors V1 to V6 and two zero voltage vectors V1 and V7. In FIG. 2, 1 indicates the ON state of the upper arm switch, and 0 indicates the ON state of the lower arm switch. The electrical angle 2π period is divided into phase periods A to F between these effective voltage vectors V1 to V6. A voltage vector at an arbitrary phase angle within these phase periods can be formed by adjusting the ratio of the energization times of the effective voltage vectors V1 to V6 on both sides of the phase period of the effective voltage vectors V1 to V6. .

  An example of a method for forming a PWM signal will be described with reference to FIG.

  A voltage vector V0 to V7 is obtained by a combination (logical signal) of a comparison result between the triangular wave voltage 100 having a predetermined PWM carrier cycle and the three-phase voltage command values Uth, Vth, and Wth that are sine wave voltages whose phases are different by 2π / 3. Is determined. In FIG. 3, the voltage vector determined by the time t6 of the effective voltage vector V6 and the time t1 of the effective voltage vector V1 determines the amplitude of the three-phase voltage corresponding to this voltage vector (actually the energization time of each phase). ) Is determined.

  Therefore, in this PWM control method, the time obtained by subtracting the total time of the effective voltage vector in one period from one period of the PWM carrier signal that is the triangular wave voltage 100 is the sum of the time of the zero voltage vectors V0 and V7. The length of time of the voltage vector V0 is easily realized by offsetting the three-phase voltage command values Uth, Vth, Wth by the same amount (see FIG. 3). Since PWM control-type sinusoidal modulation itself is known, further explanation is omitted.

(Step-up control by neutral point feeding method)
Next, boost control by a known neutral point power feeding method will be briefly described with reference to FIG. The stored voltage of the capacitor 5 is changed by changing the time t0 of the voltage vector V0 due to the offset. That is, the voltage vector V0 corresponds to the reactor power storage period by the boost chopper, so if the time t0 of the voltage vector V0 is extended, the boost ratio is increased by increasing the stored voltage of the capacitor 5, and the boost ratio is decreased by shortening it. Can do. It can also be adjusted by manipulating the amplitude center value. As described in Patent Document 2, in this step-up ratio control, maintaining the step-up ratio (the stored voltage Vc of the capacitor 5 / the battery voltage Vb) at 2 is effective in terms of improving efficiency.

(Control of time t0 of voltage vector V0)
Next, control of the time t0 of the voltage vector V0 that characterizes this embodiment will be described with reference to the flowchart shown in FIG. However, the control of the time t0 of the voltage vector V0 shown in this flowchart is an example, and the time t0 of the voltage vector V0 is set to be at least given priority over the adjustment of the time t0 of the voltage vector V0 for the step-up ratio control. Other control methods may be employed as long as the minimum required value thmin can be exceeded.

  In FIG. 4, first, the time t0 of the voltage vector V0 is calculated, and it is checked whether or not the time t0 of the voltage vector V0 is larger than the minimum required value thmin. If it is below, the three-phase voltage command values Uth, Vth, Wth are the same. The time t0 of the voltage vector V0 is set to the minimum necessary value thmin by offsetting by the amount. As a result, regardless of the magnitude of the phase voltage command value and the motor rotation speed, the time t0 of the voltage vector V0 can be secured for a certain time.

  As another example, the time t0 of the voltage vector V0 is shortened because the motor rotational speed is high (the actual time corresponding to the electrical angle 2π is short), and any of the three-phase voltage command values Uth, Vth, Wth Is limited to a phase period with a large amplitude value, it is determined whether or not these conditions are occurring at the present time. If so, the time t0 of the voltage vector V0 becomes the minimum required value thmin. Thus, the three-phase voltage command values Uth, Vth, and Wth may be offset by the same amount. The three-phase voltage command values Uth, Vth, and Wth here are values obtained in the feedback PWM sine wave modulation control of the PWM control method performed by the control device 6.

  The minimum required value thmin is set to 10 μsec in this embodiment. This is because, as shown in FIG. 8, a sufficient sampling timing of the voltage drop of the shunt resistors 31 to 33 performed after a predetermined time (7 μsec in this case) from the start of the time t0 of the voltage vector V0 is ensured. . Thereby, the lower arm current of each phase of the inverter 2 by the shunt resistors 31 to 33 can be detected with high accuracy regardless of the operating state. That is, in order to sufficiently delay the time until the voltage drop of the shunt resistors 31 to 33 is actually sampled after the gate voltage to the lower arm switches 24 to 26 becomes high level, The arm current can be detected.

(Modification)
In a preferred embodiment, the predetermined time Δt, which is the sampling delay time from the start time of the V0 period to the sampling time, is such that the amplitude of the ringing of the current of the lower arm switch immediately after the start of energization of the lower arm switch is less than 10% of the maximum value. It is set to a decayable period. Thereby, it is possible to satisfactorily suppress a decrease in current detection accuracy due to the ringing of the current of the lower arm switch due to the lower arm switch being turned on. Naturally, in this case, the predetermined minimum threshold time in the V0 period is the sum of the sampling delay time (ringing decay period) t3 and the time required for sampling.

(Modification)
A modification will be described with reference to FIG.

  In this embodiment, the current detection means 3 includes the shunt resistors 31 to 32 individually connected in series with the U and V phase lower arm switches 24 and 25 of the three-phase inverter 2, and the low potential terminal (low potential) of the inverter 2. Side connection bus line) and a line connection resistance element 30. The W-phase current can be obtained by subtracting the U and V-phase lower arm currents detected by the shunt resistors 31 to 32 from the total current detected by the line connection resistance element 30.

(Modification)
A modification will be described with reference to FIG.

  In this aspect, the current detection means 3 includes the shunt resistors 31 to 33 individually connected in series with the three-phase lower arm switches 24 to 26 of the three-phase inverter 2, and the low potential end (low potential side power source) of the inverter 2. And a line connection resistance element 30 interposed in the bus). In this way, an overcurrent can be easily detected from the total current detected by the line connection resistance element 30, and even if one of these four detection current systems breaks down, the remaining three current detection systems cause the three phases. Therefore, the reliability of the current detection means can be remarkably improved.

(Modification)
In the above embodiment, the neutral point power feeding method in which the battery voltage (DC power supply voltage) is applied between the neutral point of the star connection stator coil and the low potential end of the inverter has been described. Neutral point feeding method that applies battery voltage (DC power supply voltage) between the neutral point of the coil and the high potential end of the inverter, or battery voltage (DC power supply) between the neutral points of the two star connection stator coils Those skilled in the art will readily understand that the present invention described above can also be applied to a neutral-point power feeding method in which a voltage is applied.

(Modification)
In FIG. 1, three phase currents are detected on the lower arm side of the inverter 2, but these currents are summed and the current output from the inverter 2 to the stator coil 1 of the three-phase motor (also referred to as inverter total current). Of course, it can be detected.

(Modification)
In FIG. 1, three phase currents are detected on the lower arm side of the inverter 2, but it is a matter of course that three phase currents may be detected on the upper arm side of the inverter 2 as shown in FIG. . In this case, the V7 period is set to a predetermined minimum value or more in order to ensure current detection accuracy.

(Modification)
In FIG. 1, the battery 4 forming the first power source has the positive electrode connected to the neutral point, but it is obvious that the negative electrode of the battery 4 may be connected to the neutral point as shown in FIG. 10.

(Modification)
FIG. 11 shows a mode in which current detection is performed on the upper arm side of the inverter 2 in FIG.

(Modification)
FIG. 12 is obtained by adding a current detection resistance element 34 for detecting the total inverter current in FIG.

(Modification)
FIG. 13 is obtained by adding a relay 7 for intermittently controlling the current flowing from the battery 4 to the neutral point in FIG. This relay is controlled by a control device 6 shown in FIG. 1 as will be described later.

(Modification)
FIG. 14 is obtained by adding a current detection resistance element 34 for detecting the total inverter current in FIG.

(Modification)
FIG. 15 is a diagram in which the position of the current detection resistor element 34 of FIG. 14 is changed.

(Failure response control)
Next, a failure response control example performed based on the above-described current will be described with reference to the flowchart shown in FIG.

  First, it is determined whether or not the rotational speed N exceeds a predetermined threshold Nth (S200), and if it exceeds, the zero voltage vector on the current detection arm side among the lower arm and the upper arm, that is, the voltage vector V0 is determined. One of the periods with V7 is extended (S202).

  Next, current detection is performed after a predetermined time Δt from the start point of the zero voltage vector on the current detection side among the zero voltage vectors V0 and V7 (S204).

  Next, overcurrent determination of the inverter 2 and failure determination of each arm switch of the inverter 2 are performed based on the detected current (S206). Only one of the overcurrent determination of the inverter 2 and the failure determination of each arm switch of the inverter 2 may be performed. In addition, since the overcurrent determination of the inverter 2 and the failure determination itself of each arm switch of the inverter 2 based on the phase current of the inverter and each phase current are already known matters, detailed description thereof will be omitted.

Next, it is checked whether or not the result of the overcurrent determination is defective (whether it is determined as an overcurrent) or whether the result of the failure determination of each arm switch of the inverter 2 is defective (S208). If there is, the relay 7 (see FIG. 15) is opened (S210).
(Supplementary information)
The term “connection” in the present invention means so-called electrical connection, and includes direct connection as well as connection through other circuit elements (for example, relays). In addition, “detecting each phase current on the upper arm side or lower arm side of the inverter” means “detecting all phase currents on the upper arm side or lower arm side of the inverter independently, In addition to detecting a number of phase currents, a known phase current detection method is also included which detects the total of each phase current and subtracts the detected total phase current from the total phase current to detect one remaining phase current.

It is a circuit diagram showing an inverter control motor device of an embodiment. FIG. 2 is a voltage vector diagram showing PWM control of the inverter of FIG. 1. 3 is a timing chart showing an example of voltage vector formation by the PWM control method of FIG. 2. It is a flowchart which shows control of the duration of voltage vector V0 of this Example. It is a circuit diagram which shows the electric current detection means structure of a deformation | transformation aspect. It is a circuit diagram which shows the electric current detection means structure of a deformation | transformation aspect. It is a circuit diagram which shows the conventional inverter control motor apparatus (equivalent to FIG. 1). It is a timing chart which shows the sampling timing for the electric current detection of FIG. 1 or FIG. It is a circuit diagram which shows the electric current detection means structure of a deformation | transformation aspect. It is a circuit diagram which shows the electric current detection means structure of a deformation | transformation aspect. It is a circuit diagram which shows the electric current detection means structure of a deformation | transformation aspect. It is a circuit diagram which shows the electric current detection means structure of a deformation | transformation aspect. It is a circuit diagram which shows the electric current detection means structure of a deformation | transformation aspect. It is a circuit diagram which shows the electric current detection means structure of a deformation | transformation aspect. It is a circuit diagram which shows the electric current detection means structure of a deformation | transformation aspect. It is a flowchart which shows the abnormality response operation | movement based on a detected electric current.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Stator coil 2 Inverter 3 Current detection means 4 Battery 5 Capacitor 6 Control apparatus 21-23 Upper arm switch 24-26 Lower arm switch 30 Line connection resistance element 31-32 Shunt resistance 31-33 Shunt resistance

Claims (18)

A first power source connected to a high potential end and a low potential end of a multi-phase inverter for driving a multi-phase rotating electrical machine having an upper arm switch and a lower arm switch controlled for switching for each phase; Current detection means for detecting at least one of the phase currents flowing through the upper arm switch and the lower arm switch, one end at the neutral point of the polyphase rotating electrical machine, and the other end at the high potential end or low potential end of the inverter In a control device for a multi-phase rotating electrical machine that is mounted on a rotating electrical machine device that includes a second power source to be connected and controls the inverter based on the detected phase current,
At least one of the period in which all the upper arm switches of each phase of the inverter are on and the period in which all the lower arm switches of each phase are on is extended by a predetermined time ΔT during high-speed rotation of at least a predetermined value. In addition, a control device for a multi-phase rotating electrical machine, wherein the current on the arm side extended for the period is detected. In the control apparatus of the multiphase rotating electrical machine according to claim 1,
The control device is a control device for a multi-phase rotating electrical machine in which an amplitude center value of a phase voltage command defining a phase voltage applied to the multi-phase rotating electrical machine is 50% or less of a voltage value of the first power supply. In the control apparatus of the multiphase rotating electrical machine according to claim 1 or 2,
If the amplitude of the phase voltage command that defines the phase voltage to be applied to the multiphase rotating electrical machine is greater than or equal to a predetermined value, the control device changes the amplitude center value of the phase voltage command. In the control apparatus of the multiphase rotating electrical machine according to any one of claims 1 to 3,
The predetermined time ΔT is a polyphase that is set from the time when the amplitude of the ringing of the current flowing immediately after energization of the lower arm switch or the upper arm switch of the arm on the current detection side becomes less than 10% of the maximum value. Control device for rotating electrical machines. In the control apparatus of the multiphase rotating electrical machine according to any one of claims 1 to 4,
The current detection means is a control device for a multi-phase rotating electrical machine, which is arranged in an equal number to each arm of the inverter. In the control apparatus of the multiphase rotating electrical machine according to any one of claims 1 to 5,
The arm switch current detection means is a control device for a multi-phase rotating electrical machine comprising a resistance element for current detection. In the control apparatus of the multiphase rotating electrical machine according to any one of claims 1 to 6,
The current detecting means includes a resistance element for the number of phases individually connected in series with the arm switches on the lower arm side of all phases of the inverter, and a resistance element for detecting the current of the low potential side power supply bus of the inverter And a control device for a multi-phase rotating electrical machine. In the control apparatus of the multiphase rotating electrical machine according to any one of claims 1 to 7,
A control device for a multiphase rotating electrical machine that detects a current on a low potential side or a high potential side of the second power source and determines an overcurrent based on the current. In the control apparatus of the multiphase rotating electrical machine according to any one of claims 1 to 8,
A control device for a multiphase rotating electrical machine that detects a current on a low potential side or a high potential side of the second power supply and detects a failure of the control device based on the current. In the control apparatus of the multiphase rotating electrical machine according to claim 1,
The second power supply is a control device for a multiphase rotating electrical machine connected to the multiphase rotating electrical machine or the inverter via a relay. In the control apparatus of the multiphase rotating electrical machine according to claim 8 or 9 ,
The second power source is connected to the multiphase rotating electrical machine or the inverter via a relay,
A controller for a multi-phase rotating electrical machine that disconnects the second power source and the inverter by the relay when a failure or an overcurrent is detected. In the control apparatus of the multiphase rotating electrical machine according to any one of claims 1 to 11,
The first power source is a control device for a multi-phase rotating electrical machine comprising power storage means. In the control apparatus of the multiphase rotating electrical machine according to any one of claims 1 to 12,
The multi-phase rotating electrical machine is a control device for a multi-phase rotating electrical machine comprising a three-phase radial gap type synchronous motor. In the control apparatus of the multiphase rotating electrical machine according to any one of claims 1 to 13,
A control device for a multi-phase rotating electrical machine for vehicle use. A motor having a multiphase stator coil to which a DC power supply voltage is applied to a neutral point; an inverter having a multiphase output terminal individually connected to each phase terminal of the stator coil; and a high potential end of the inverter Storage means for connecting the inverter and the low potential end, a control device for intermittently controlling the upper arm switch and the lower arm switch of each phase of the inverter, and at least one current on the lower arm side and the upper arm side of the inverter. Current detecting means for detecting, and the control device sets the intermittent control mode of the upper arm switch and the lower arm switch based on a combination of voltage vectors corresponding to the output state of the multi-phase output terminal of the inverter. In the multiphase rotating electrical machine device to be changed,
The control device adjusts a voltage vector V7 for turning on all upper arm switches and a voltage vector V0 for turning on all lower arm switches, thereby adjusting the stored voltage of the power storage means to a predetermined target value. Is set so that the V0 (or V7) period for outputting the zero voltage vector V0 (or V7) does not fall below at least the predetermined minimum threshold time, and the V0 (or V7) period of the set V0 (or V7) period is set. A multiphase rotating electrical machine apparatus, wherein a detected current value of the current detecting means is detected at a sampling time point delayed by a predetermined time Δt from a start time point. The multiphase rotating electrical machine apparatus according to claim 15,
The predetermined time Δt is a multiphase rotating electrical machine apparatus that is set to a period in which the amplitude of the ringing of the current of the lower arm switch immediately after the start of energization of the lower arm switch is less than 10% of the maximum value. The multiphase rotating electrical machine apparatus according to claim 15,
The current detection means is a multiphase rotating electrical machine apparatus having resistance elements for the number of phases individually connected in series with the lower arm switches of all phases of the inverter. The multiphase rotating electrical machine apparatus according to claim 15 ,
The current detection means includes two-phase resistance elements individually connected in series with the lower arm switches of the two phases of the three-phase inverter, and a line connection for detecting the current of the low-potential power supply bus of the inverter A multiphase rotating electrical machine apparatus having a resistance element.