CN103199637B - Wound-rotor synchronous motor exciting current non-contact type transmitting device and method thereof - Google Patents
Wound-rotor synchronous motor exciting current non-contact type transmitting device and method thereof Download PDFInfo
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Abstract
The invention discloses a wound-rotor synchronous motor exciting current non-contact type transmitting device and a method thereof. The wound-rotor synchronous motor exciting current non-contact type transmitting device comprises a static end and a rotating end. The static end comprises a static end printed circuit board (PCB) assembly, a static end fixing and supporting structure, a static end soft magnetism conductor and a static end winding. The rotating end comprises a rotating end PCB assembly, a rotating end fixing and supporting structure, a rotating end soft magnetism conductor, a rotating end winding and a rotor coil. According to the wound-rotor synchronous motor exciting current non-contact type transmitting device and the method thereof, rotor adjustable exciting current technical requirements are met, and meanwhile, a mechanical reversing structure is eliminated; and the wound-rotor synchronous motor exciting current non-contact type transmitting device further has a de-excitation function and an inductive power feedback function, reliability of a system is improved, maintenance difficulty and cost are reduced, and use ratios of a power supply are improved.
Description
Technical Field
The invention relates to the field of power systems and motors, in particular to a non-contact transmission device and a non-contact transmission method for exciting current of a wound rotor synchronous motor.
Background
The wound rotor synchronous motor has the advantages of low rotor cost (no permanent magnet material), easy optimization control (controllable exciting current and no need of worrying about irreversible demagnetization), high power factor, good electromagnetic torque control characteristic and the like, and is increasingly applied to various fields, such as an ISG motor in an automobile, a new energy automobile driving system and the like. However, the excitation current transmission device of the brush wound rotor synchronous motor in the prior art includes an AC-DC conversion circuit or a DC-DC conversion circuit, a controller, a filter circuit, a brush, a slip ring, and a rotor; the excitation is realized by rectifying the alternating current into direct current and then outputting adjustable exciting current through a direct current converter, or outputting adjustable exciting current through a direct current converter by the direct current provided by a battery, and then introducing the exciting current into the wound rotor through a commutator (an electric brush and a slip ring). In the process of transmitting the exciting current, when a mechanical reversing structure (an electric brush and a slip ring) works, sparks, EMI (electro-magnetic interference) and noise are easily generated, the mechanical reversing structure is extremely easy to wear and needs frequent maintenance, and the mechanical structure is complex, so that the maintenance is difficult.
Disclosure of Invention
The present invention overcomes the disadvantages and solves the problems of the prior art, and to this end, the present invention provides a non-contact transmission device for exciting current of a wound rotor synchronous motor, comprising a stationary end and a rotating end, the stationary end comprising: the fixed bearing structure of static end PCB subassembly, static end fixed, the soft magnetic conductor of static end and static end winding, the rotation end includes: the rotating end PCB assembly, the rotating end fixed supporting structure, the rotating end soft magnetic conductor, the rotating end winding and the rotor coil are arranged on the rotating end PCB assembly; the static end PCB assembly is fixedly arranged on the static end fixing and supporting structure and comprises an input voltage and current detection module, a control module and a double-end forward converter; the input voltage and current detection module is connected with a power supply and used for accessing direct current of a direct current bus, sampling voltage and current, generating sampling voltage and sampling current and transmitting the sampling voltage and the sampling current to the control module; the control module is used for receiving the sampling voltage and the sampling current, calculating the current and the power of the rotor coil during working, comparing the current and the power with a set value, generating a control signal to control the current and the power of the rotor coil during working, and transmitting the control signal to the double-end forward converter; the double-end forward converter comprises two switching tubes, wherein the two switching tubes are used for accessing direct current on the direct current bus, converting the direct current into high-frequency alternating current, adjusting and controlling the duty ratio of the switching tubes according to a control signal sent by the control module so as to adjust the high-frequency alternating current and transmit the high-frequency alternating current to the stationary end winding; the static end soft magnetic conductor is arranged on the inner side of the static end fixed supporting structure; the static end winding is arranged on the inner side of the static end soft magnetic conductor and used for receiving the high-frequency alternating current, and the high-frequency alternating current is transmitted to the rotating end winding through the static end winding, the static end soft magnetic conductor and the rotating end soft magnetic conductor; the rotating end winding is arranged on the inner side of the rotating end soft magnetic conductor, is parallel to the position of the static end winding, and is used for receiving the high-frequency alternating current and transmitting the high-frequency alternating current to the rotating end PCB assembly; the rotating end soft magnetic conductor is arranged on the inner side of the rotating end fixed supporting structure and is parallel to the static end soft magnetic conductor; the rotating end PCB assembly is fixedly arranged on the rotating end fixed supporting structure and comprises a rectification feedback module and a follow current demagnetization module; the rectification feedback module comprises a rectification circuit, a charging loop and a discharging loop, and is used for rectifying the high-frequency alternating current and transmitting the rectified high-frequency alternating current to the rotor coil, storing induced electromotive force generated by the rotor coil by using the charging loop and the discharging loop, and feeding back the induced electromotive force to the power supply; the follow current de-excitation module is used for providing a follow current path for exciting current generated by the rotor coil, performing follow current on the exciting current generated by the rotor coil, and providing a de-excitation path for the rotor coil to inhibit excessive peak voltage generated on the rotor coil.
The invention also provides a transmission method by using the wound rotor synchronous motor exciting current non-contact transmission device, which comprises the following steps: the static end is connected with a power supply, is connected with the direct current of the direct current bus, and samples the voltage and the current to generate a sampled voltage and a sampled current; receiving the sampling voltage and the sampling current, calculating the current and the power of the rotor coil during working, comparing the current and the power with a set value, and generating a control signal to control the current and the power of the rotor coil during working; the direct current on the direct current bus is accessed, the direct current is converted into high-frequency alternating current, and the duty ratio of a control switching tube is adjusted according to the control signal so as to adjust the size of the high-frequency alternating current; transmitting the high-frequency alternating current to the rotating end winding through a static end winding, a static end soft magnetic conductor and a rotating end soft magnetic conductor; at the rotating end, the rotating end winding receives the high-frequency alternating current; and rectifying the high-frequency alternating current and transmitting the rectified high-frequency alternating current to a rotor coil.
Compared with the prior art, the invention has the following advantages: the invention provides a non-contact type transmission device and a non-contact type transmission method for exciting current of a wound rotor synchronous motor, which realize non-contact type exciting current transmission through a rotary transformer. The static end adopts a double-end forward converter, and has the advantages of simple structure, low cost, high reliability, no direct connection problem of upper and lower bridge arms of a bridge circuit, leakage inductance energy return to a power supply, high efficiency and the like; the rotating end adopts an automatically controlled switching tube with an anti-parallel diode to realize rectification excitation or energy feedback. By the device and the method, the technical requirements of adjustable exciting current of the rotor and the like are met, and meanwhile, a mechanical reversing structure is omitted. The invention also has the de-excitation function and the inductive energy feedback function, thereby improving the reliability of the system, reducing the maintenance difficulty and cost and improving the utilization rate of the power supply (or the battery).
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
fig. 1 is a schematic side cross-sectional view of a wound rotor synchronous motor excitation current non-contact transmission device according to an embodiment of the present invention;
fig. 2A is a schematic structural diagram of a stationary end of a non-contact transmission device for exciting current of a wound rotor synchronous motor according to an embodiment of the present invention;
fig. 2B is a schematic structural diagram of a rotating end of a non-contact transmission device for exciting current of a wound rotor synchronous motor according to an embodiment of the present invention;
fig. 3 is a circuit configuration diagram of a non-contact transmission device for exciting current of a wound rotor synchronous motor according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a control module of a non-contact transmission device for exciting current of a wound rotor synchronous motor according to an embodiment of the present invention;
fig. 5 is a side cross-sectional view schematically illustrating an excitation current non-contact type transmission device of a wound rotor synchronous motor according to another embodiment of the present invention;
fig. 6A is a schematic cross-sectional view of a stationary end of a non-contact transmission device for exciting current of a wound rotor synchronous motor according to an embodiment of the present invention;
fig. 6B is a schematic front cross-sectional view of a rotating end of a non-contact transmission device for exciting current of a wound rotor synchronous motor according to an embodiment of the present invention;
FIG. 7A is a flowchart illustrating the steps of a transmission method using a non-contact transmission device for the exciting current of a wound rotor synchronous motor according to an embodiment of the present invention;
FIG. 7B is a flowchart illustrating the steps of a transmission method using a non-contact transmission device for the exciting current of a wound rotor synchronous motor according to another embodiment of the present invention;
FIG. 8 is a flowchart of method steps for generating a control signal according to one embodiment of the present invention;
FIG. 9 is a flowchart illustrating steps of a method for generating a control signal according to another embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention are described in further detail below with reference to the accompanying drawings. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention. Hereinafter, the excitation current non-contact transmission device of the wound rotor synchronous motor is simply referred to as a transmission device, and the excitation current non-contact transmission method of the wound rotor synchronous motor is simply referred to as a transmission method.
Fig. 1 is a schematic side cross-sectional view of a wound rotor synchronous motor excitation current contactless transmission device according to an embodiment of the present invention. As shown in fig. 1, the transmission device of the present embodiment includes a stationary end and a rotating end; the stationary end includes: the PCB assembly comprises a static end PCB assembly 11, a static end fixed supporting structure 12, a static end soft magnetic conductor 13 and a static end winding 14; the rotating end includes: the rotating end PCB assembly, the rotating end fixed supporting structure, the rotating end soft magnetic conductor, the rotating end winding and the rotor coil are arranged on the rotating end PCB assembly; wherein,
the static end PCB assembly 11 is fixedly arranged on the static end fixing and supporting structure 12, so that the heat radiator serving as a switch tube can be taken into consideration, and the space is saved;
the static end soft magnetic conductor 13 is arranged on the inner side of the static end fixed supporting structure 12;
the static end winding 14 is arranged on the inner side of the static end soft magnetic conductor 13;
the rotating end winding 15 is arranged on the inner side of the rotating end soft magnetic conductor 16 and is parallel to the position of the static end winding 14;
the soft magnetic conductor 16 at the rotating end is arranged at the inner side of a fixed supporting structure 17 at the rotating end and is parallel to the soft magnetic conductor 13 at the static end;
the rotating end PCB assembly 18 is fixedly arranged on the rotating end fixed supporting structure 17, so that the rotating end PCB assembly can be taken as a radiator of a switch tube, and the space is saved;
a rotor coil 19 is also mounted at the rotating end of the transmission.
In the present embodiment, the stationary end winding 14 and the rotating end winding 15 are carriers of the stationary end excitation current and the rotating end induction current.
In this embodiment, the stationary-side soft magnetic conductor 13 and the rotating-side soft magnetic conductor 16 are made of a magnetically conductive material, provide a path for the transmission of magnetic flux, and are made of sinterable magnetic powder, such as ferrite or a magnetic powder core.
In the present embodiment, as shown in fig. 2A, the stationary-side PCB assembly 11 includes: an input voltage and current detection module 111, a two-terminal forward converter 112 and a control module 113;
the input voltage and current detection module 111 is connected to a power supply, is connected to the direct current of the direct current bus, samples the voltage and the current, generates a sampling voltage and a sampling current, and transmits the sampling voltage and the sampling current to the control module 113;
the control module 113 is configured to receive the sampling voltage and the sampling current, calculate a current and a power of the rotor coil during operation, compare the current and the power with a set value, generate a control signal to control the current and the power of the rotor coil during operation, and transmit the control signal to the double-ended forward converter 112;
in the present embodiment, the current operating state of the rotor coil 19 is calculated by sampling the voltage and the sampling current, the current state is compared with a predetermined state, correlation calculation is performed, and a control signal for controlling the switching tubes Q1 and Q2 is generated by current comparison or PI regulation, thereby regulating the operating state of the rotor coil 19 to a set value.
A two-terminal forward converter 112 including two switching tubes Q1, Q2 and two diodes D1, D2; the double-ended forward converter 112 is also connected to a power supply, is connected to the direct current on the direct current bus, converts the direct current into high-frequency alternating current, adjusts the duty ratios of the control switch tubes Q1 and Q2 according to a control signal sent by the control module 113 so as to adjust the magnitude of the high-frequency alternating current, and transmits the high-frequency alternating current to the stationary end winding 14;
the stationary end winding 14 receives the high-frequency alternating current and transmits the high-frequency alternating current through the winding in a non-contact manner into the rotating end winding 15 (located in fig. 2B). In the present embodiment, the rotating end winding 15 generates high-frequency induced alternating current by magnetic coupling.
As shown in fig. 2B, the swivel end PCB assembly 18 includes: a rectification feedback module 181 and a follow current demagnetization module 182; referring to fig. 2A, the rotating end winding 15 receives the high-frequency ac power transmitted by the stationary end winding 14, and transmits the high-frequency ac power to the rectification feedback module 181 in the rotating end PCB assembly 18;
the rectification feedback module 181 comprises a rectification circuit, a charging circuit and a discharging circuit, wherein the rectification circuit is used for rectifying the high-frequency alternating current and then transmitting the rectified high-frequency alternating current to the rotor coil 19, so that the rotor coil 19 forms an excitation current and generates a rotor excitation magnetic field; a charging circuit and a discharging circuit are utilized to provide a path for the induced electromotive force generated by the rotor coil 19, store the induced electromotive force generated by the rotor coil 19 and feed back the induced electromotive force to a power supply through the circuit;
the freewheeling de-excitation module 182 provides a freewheeling path for the excitation current generated by the rotor coil 19 to smooth the excitation current and provide a stable rotor excitation field, and the freewheeling de-excitation module 182 also provides a de-excitation path to suppress the generation of an excessive peak voltage on the rotor coil.
Fig. 3 is a circuit configuration diagram of a non-contact transmission device for exciting current of a wound rotor synchronous motor according to an embodiment of the present invention. As shown in fig. 3, the circuit structure in the transmission device includes: an input voltage and current detection module 111, a double-ended forward converter 112, a winding part 120, a rectification feedback module 181, a freewheeling demagnetization module 182 and a Rotor coil 19 (Rotor in the figure);
wherein, the input voltage and current detection module 111 is connected to the power supply and is connected to the direct current (V) of the direct current busDCBUS+And VDCBUS-) The voltage and current are sampled by a voltage sensor VSEN1 and a current sensor ISEN1 to generate a sampled voltage and a sampled current, which are transmitted to the control module 113.
The double-ended forward converter 112 adjusts duty ratios of the switching tubes Q1 and Q2 through control signals sent by the control module 113, and adjusts the magnitude of the high-frequency alternating current to change the exciting current in the rotor coil 19;
the switching tubes Q1 and Q2 may be IGBT or MOSFET transistors.
The winding part 120 includes a stationary-side soft magnetic conductor 13, a stationary-side winding 14, a rotating-side winding 15, a rotating-side soft magnetic conductor 16; the static end soft magnetic conductor 13 and the rotating end soft magnetic conductor 16 provide a path for transmission of magnetic flux; the stationary end winding 14 and the rotating end winding 15 are carriers of stationary end excitation current and rotating end induction current;
the stationary-side soft magnetic conductor 13 and the stationary-side winding 14 transmit the high-frequency alternating current to the rotating-side winding 15 and the rotating-side soft magnetic conductor 16 through non-contact.
The rectification feedback module 181 includes a switching transistor Q3, a voltage regulator ZD1, a capacitor C1, a diode D4, a resistor R1, and a resistor R2.
The freewheel de-excitation module 182 includes a freewheel diode D3 and a capacitor C2.
The high-frequency alternating current is rectified by an anti-parallel diode in a switching tube Q3 and then transmitted to the rotor coil 19, and finally, non-contact (isolated) excitation current transmission is realized.
In this embodiment, the voltage sensor VSEN1 may be a resistor divider or an isolated sample such as hall or opto-coupler.
In this embodiment, the current sensor ISEN1 may be a resistor or a hall, opto-coupler, or other isolated sample.
In this embodiment, the on-off control timing of the switching tube Q3 is easily realized by adjusting parameters of the resistor R1, the resistor R2, the diode D4, the voltage regulator ZD1, and the capacitor C1.
The resistor R1, the capacitor C1 and the voltage regulator tube ZD1 form a charging loop, and the charging voltage of the clamping capacitor C1 does not exceed a voltage regulation value; the diode D4, the resistor R2 and the capacitor C1 form a discharge circuit. When the double-ended forward converter 112 stops working (excitation current is not supplied to the rotor coil 19), due to the existence of the stator rotating magnetic field, an induced electromotive force is generated on the rotor coil 19, when the induced electromotive force is positive and negative in the direction, the capacitor C1 is charged, when the charging voltage reaches the opening threshold of the switching tube Q3, the switching tube Q3 is turned on, the induced current flows through the rotating end winding 15 of the rotating part 120, and the induced current is fed back to a power supply (or a battery) through the double-ended forward converter 112, so that high voltage on the winding does not break through a rotor insulating layer, and the energy feedback function is realized.
In the present embodiment, when the switching tubes Q1, Q2 in the double-ended forward converter 112 are turned off, the current of the rotor coil 19 freewheels through the freewheeling diode D3. Because the wound rotor has inductance characteristics, it can be reused as a choke in the double-ended forward converter 112 to reduce the size and cost of the whole converter. The magnitude of the field current ripple may be controlled by adjusting the operating frequency of the double-ended forward converter 112.
In this embodiment, when the double-ended forward converter 112 stops operating, excitation in the winding inductance of the rotor coil 19 forms a demagnetization loop through the freewheeling diode D3, and energy is rapidly consumed in the rotor winding to suppress the generation of an excessive peak voltage on the rotor winding, so as to prevent an excessive induced electromotive force generated in the winding from breaking through the rotor insulation layer, thereby achieving a demagnetization function.
The feedback function and the de-excitation function are only an abnormal working mode and can not occur simultaneously with a normal rotor excitation working state, so that the aim of preventing the rotor coil from generating an excessively high back electromotive force to damage a motor or the device and feeding back a part of energy is fulfilled.
In the present embodiment, the capacitor C2 is a filter capacitor.
Referring to fig. 3, fig. 4 is a schematic structural diagram of a control module of a non-contact transmission device for exciting current of a wound rotor synchronous motor according to an embodiment of the present invention. As shown in fig. 4, the control module 113 is connected to the external control unit 200; the driving circuit comprises a voltage detection unit 1131, a current detection unit 1132, a temperature detection unit 1133, an MCU control unit 1134, a first driving circuit 1135, a second driving circuit 1136 and a communication unit 1137;
the voltage detection unit 1131 receives the sampled voltage, conditions the sampled voltage, generates a voltage conditioning signal, and sends the voltage conditioning signal to the MCU control unit 1134;
the current detection unit 1132 is used for receiving the sampling point Liu, conditioning the sampling current, generating a current conditioning signal and sending the current conditioning signal to the MCU control unit 1134;
the MCU control unit 1134 receives the voltage conditioning signal and the current conditioning signal, calculates the current and power of the rotor coil 19 during operation according to the voltage conditioning signal and the current conditioning signal, compares the current and power with a set value, and generates a control signal for controlling the switching tubes Q1 and Q2 to control the current and power of the rotor coil 19 during operation, so that the operating state of the rotor coil 19 reaches the set value;
the driving circuit 1135 receives the control signal, and performs isolation amplification on the control signal to drive and control the switching tube Q1 to be turned on or off;
the driving circuit 1136 receives the control signal, and performs isolation amplification on the control signal to drive and control the switching tube Q2 to be turned on or off.
In the present embodiment, the winding portion 120 has the characteristics of isolated transmission of electric energy and definite transformation ratio characteristics for voltage and current. The rotor coil 19 is a wound-rotor type excitation coil, and can be equivalent to a series connection of a large inductor and a resistor, so that by designing and programming a program in the MCU control unit 1134, the current and power of the rotor coil 19 are calculated according to the dc bus voltage and current, and finally, by adjusting the duty ratios of the switching tubes Q1 and Q2 in the double-ended forward converter 112, the magnitude of the excitation current in the rotor coil 19 is adjusted.
In this embodiment, the control module 113 further includes a temperature detecting unit 1133, where the temperature detecting unit 1133 is configured to detect a temperature inside the transmission device, generate a temperature signal, and send the temperature signal to the MCU control unit 1134; the MCU control unit 1134 analyzes the operating temperature of the transmission device according to the temperature signal, performs a determination process to determine whether the device needs normal, derated or shutdown operation, generates a temperature control signal, and sends the temperature control signal to the driving circuit 1135 and the driving circuit 1136.
In this embodiment, the control module 113 further includes a communication unit 1137, where the communication unit 1137 is configured to be connected to the external control unit 200, acquire an external control signal, and transmit the external control signal to the MCU control unit 1134 through a communication manner of CAN, FlexRay or 485; the MCU control unit 1134 receives the external control signal, processes the external control signal, and transmits the processed external control signal to the driving circuit 1135 and the driving circuit 1136.
In another embodiment, the external control unit 200 (stator driving control unit of the winding synchronous motor) sends commands of starting, setting an excitation current value, stopping and the like to the MCU control unit 1134 of the transmission device through the CAN bus (or FlexRay or 485 or other communication modes), then the MCU control unit 1134 operates according to the current state of the transmission device and the given command requirement, and detects the voltage and current of the dc bus in real time, and outputs an external control signal (PWM signal) through calculation and PI regulation, and controls the on-off of the switching tubes Q1 and Q2 through the driving circuit 1135 and the driving circuit 1136, and outputs a stable excitation current varying with the given command, so that the winding synchronous motor operates at a certain speed and torque, and the MCU control unit 1134 CAN report the current operation state of the transmission device to the external control unit 200.
Referring to fig. 1, as shown in fig. 5, a schematic side cross-sectional view of a non-contact transmission device for exciting current of a wound rotor synchronous motor according to another embodiment of the present invention is shown; in comparison with the transmission device shown in fig. 1, the transmission device of this embodiment further includes: a motor stator casing 20, a stationary end locking screw 21, a rotating end locking screw 22 and a rotor rotating shaft 23; wherein,
the static end fixing and supporting structure 12 is fixedly arranged on the inner side of the motor stator casing 20;
the stationary end locking screw 21 can move axially in the U-shaped groove, adjust the gap between the stationary end soft magnetic conductor 13 and the rotating end soft magnetic conductor 16, and lock the stationary end fixed support structure 12 and the stationary end soft magnetic conductor 13;
the rotating end locking screw 22 is used for locking the rotating end fixed supporting structure 17 and the rotating end soft magnetic conductor 16;
the rotor rotating shaft 23 penetrates through the fixed supporting structure 12 at the stationary end, and the fixed supporting structure 17 at the rotating end, the locking screw 22 at the rotating end and the rotor rotating group 19 are fixedly arranged on the rotor rotating shaft 23.
Referring to fig. 1 and 5, fig. 6A and 6B are schematic front cross-sectional views of a stationary end and a rotating end of a transmission device according to an embodiment of the present invention.
As shown in fig. 6A, the stationary end includes a stationary end fixing and supporting structure 12, a stationary end soft magnetic conductor 13, a stationary end winding 14, a stationary end soft magnetic conductor 13, a stationary end fixing and supporting structure 12, and an innermost rotor rotating shaft 23 from outside to inside, and the rotor rotating shaft 23 can rotate in the stationary end fixing and supporting structure 12.
As shown in fig. 6B, the rotating ends are respectively a rotating end fixing support structure 17, a rotating end soft magnetic conductor 16, a rotating end winding 15, a rotating end soft magnetic conductor 16, a rotating end fixing support structure 17 and a rotor rotating shaft 23 from outside to inside, the rotating end fixing support structure 17 is fixed on the loading rotor rotating shaft 23, and the rotation of the rotor rotating shaft 23 can drive all devices of the rotating ends to rotate.
In this embodiment, the stationary end fixing and supporting structure 12 and the stationary end soft magnetic conductor 13 on the outer side of the stationary end are in a hollow circular shape, and the rotating end fixing and supporting structure 17 and the rotating end soft magnetic conductor 16 on the rotating end are in a complete circular shape, which is beneficial to heat dissipation of the rotating winding and the soft magnetic conductor during operation.
Referring to fig. 1, 5, 6A and 6B, in the embodiment of the present invention, the cross-sectional area of the soft magnetic conductor 16 at the rotating end is larger than that of the soft magnetic conductor 13 at the stationary end, which is advantageous in eliminating leakage flux due to eccentricity in mounting.
Referring to fig. 1 to 3, fig. 7A is a flowchart illustrating a transmission method using a transmission apparatus according to an embodiment of the invention. As shown in fig. 7A, includes:
and step S701, connecting a power supply to the static end of the transmission device, accessing the direct current of the direct current bus, sampling the voltage and the current, and generating a sampling voltage and a sampling current.
Step S702 receives the sampled voltage and the sampled current, calculates the current and power of the rotor coil 19 during operation, compares the calculated current and power with a set value, and generates a control signal to control the current and power of the rotor coil 19 during operation.
In the present embodiment, the current operating state of the rotor coil 19 is calculated by sampling the voltage and the sampling current, the current state is compared with a predetermined state, correlation calculation is performed, and a control signal for controlling the switching tubes Q1 and Q2 is generated by current comparison or PI regulation, thereby regulating the operating state of the rotor coil 19 to a set value.
And step S703, accessing the direct current on the direct current bus, converting the direct current into high-frequency alternating current, and adjusting the duty ratio of the control switch tubes Q1 and Q2 according to the control signal so as to adjust the size of the high-frequency alternating current.
In step S704, the high-frequency alternating current is transmitted to the rotating-end winding 15 through the stationary-end winding 14, the stationary-end soft magnetic conductor 13, and the rotating-end soft magnetic conductor 16.
In step S705, the rotating end winding 15 receives a high frequency alternating current at the rotating end of the transmission device.
In the present embodiment, the rotating end winding 15 generates high-frequency induced alternating current by magnetic coupling.
Step S706, the high-frequency alternating current is rectified and then transmitted to the rotor coil 19, so that the rotor coil 19 forms an exciting current and generates a rotor exciting magnetic field.
Compared with the step flow chart shown in fig. 7A, fig. 7B is a flow chart of a transmission method using a transmission apparatus according to another embodiment of the present invention. As shown in fig. 7B, the step of comparing fig. 7A further includes:
step S707 provides a path to the induced electromotive force generated by the rotor coil 19, stores the induced electromotive force generated by the rotor coil 19, and feeds back the induced electromotive force to the power supply.
Step S708, follow current is performed on the exciting current generated by the rotor coil 19 to smooth the exciting current, provide a stable rotor exciting magnetic field, and demagnetize the rotor coil 19 to suppress the generation of an excessively high peak voltage on the rotor coil 19.
The feedback and de-excitation in step S707 and step S708 are only one non-normal operation mode, and the purpose is to prevent the motor or the device from being damaged by the excessive back electromotive force generated by the rotor coil.
In the embodiment of the present invention, in conjunction with fig. 4, the method for generating the control signal in step S702 further includes the following steps, as shown in fig. 8:
step S801, after receiving the sampling voltage, conditioning the sampling voltage to generate a voltage conditioning signal.
Step S802, after receiving the sampling current, conditioning the sampling current to generate a current conditioning signal.
Step S803, calculating the current and power of the rotor coil 19 during operation according to the voltage conditioning signal and the current conditioning signal, comparing the calculated current and power with a set value, such as current comparison or PI regulation, and generating a control signal for controlling the switching tubes Q1 and Q2 to control the current and power of the rotor coil 19 during operation, so that the operating state of the rotor coil 19 reaches the set value.
In step S804, the switching tubes Q1 and Q2 are driven and controlled to be turned on or off according to the control signal.
In another embodiment, in conjunction with fig. 4, the method for generating the control signal in step S702 further includes the following steps, as shown in fig. 9:
in step S901, the temperature in the transmission device is detected to generate a temperature signal.
Step S902, an external control signal is acquired according to external control.
In step S903, the MCU control unit 1134 receives the temperature signal, performs determination processing according to the temperature signal, generates a temperature control signal, and drives and controls the switching tubes Q1 and Q2 to turn on or off.
In this embodiment, the MCU control unit 1134 analyzes the operating temperature of the transmission device according to the temperature signal, performs a determination process, determines whether the device needs to operate normally, derated or shut down, and generates a temperature control signal.
In step S904, the MCU control unit 1134 receives the external control signal to drive and control the switching tubes Q1 and Q2 to turn on or off.
The invention provides a non-contact type transmission device and a non-contact type transmission method for exciting current of a wound rotor synchronous motor, which realize non-contact type exciting current transmission through a rotary transformer. The static end adopts a double-end forward converter, and has the advantages of simple structure, low cost, high reliability, no direct connection problem of upper and lower bridge arms of a bridge circuit, leakage inductance energy return to a power supply, high efficiency and the like; the rotating end adopts an automatically controlled switching tube with an anti-parallel diode to realize rectification excitation or energy feedback. By the device and the method, the technical requirements of adjustable exciting current of the rotor and the like are met, and meanwhile, a mechanical reversing structure is omitted. The invention also has the de-excitation function and the inductive energy feedback function, thereby improving the reliability of the system, reducing the maintenance difficulty and cost and improving the utilization rate of the power supply (or the battery).
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (11)
1. A non-contact transmission device for exciting current of a wound rotor synchronous motor is characterized by comprising a static end and a rotating end, wherein the static end comprises: the fixed bearing structure of static end PCB subassembly, static end fixed, the soft magnetic conductor of static end and static end winding, the rotation end includes: the rotating end PCB assembly, the rotating end fixed supporting structure, the rotating end soft magnetic conductor, the rotating end winding and the rotor coil are arranged on the rotating end PCB assembly; wherein,
the static end PCB assembly is fixedly arranged on the static end fixing and supporting structure and comprises an input voltage and current detection module, a control module and a double-end forward converter; wherein,
the input voltage and current detection module is connected with a power supply and used for accessing direct current of the direct current bus, sampling voltage and current, generating sampling voltage and sampling current and transmitting the sampling voltage and the sampling current to the control module;
the control module is used for receiving the sampling voltage and the sampling current, calculating the current and the power of the rotor coil during working, comparing the current and the power with a set value, generating a control signal to control the current and the power of the rotor coil during working, and transmitting the control signal to the double-end forward converter;
the double-end forward converter comprises two switching tubes, wherein the two switching tubes are used for accessing direct current on the direct current bus, converting the direct current into high-frequency alternating current, adjusting and controlling the duty ratio of the switching tubes according to a control signal sent by the control module so as to adjust the high-frequency alternating current and transmit the high-frequency alternating current to the stationary end winding;
the static end soft magnetic conductor is arranged on the inner side of the static end fixed supporting structure, and the cross sections of the static end soft magnetic conductor and the static end fixed supporting structure are in a hollow circumferential shape;
the static end winding is arranged on the inner side of the static end soft magnetic conductor and used for receiving the high-frequency alternating current, and the high-frequency alternating current is transmitted to the rotating end winding through the static end winding, the static end soft magnetic conductor and the rotating end soft magnetic conductor;
the rotating end winding is arranged on the inner side of the rotating end soft magnetic conductor, is parallel to the position of the static end winding, and is used for receiving the high-frequency alternating current and transmitting the high-frequency alternating current to the rotating end PCB assembly;
the rotating end soft magnetic conductor is arranged on the inner side of the rotating end fixed support structure and is parallel to the static end soft magnetic conductor in position, the cross section area of the rotating end soft magnetic conductor is larger than that of the static end soft magnetic conductor, and the cross sections of the rotating end soft magnetic conductor and the rotating end fixed support structure are complete circumferential shapes;
the rotating end PCB assembly is fixedly arranged on the rotating end fixed supporting structure and comprises a rectification feedback module and a follow current demagnetization module; wherein,
the rectification feedback module comprises a rectification circuit, a charging loop and a discharging loop, and is used for rectifying the high-frequency alternating current and transmitting the rectified high-frequency alternating current to the rotor coil, storing induced electromotive force generated by the rotor coil by using the charging loop and the discharging loop, and feeding back the induced electromotive force to the power supply;
the follow current de-excitation module is used for providing a follow current path for exciting current generated by the rotor coil, performing follow current on the exciting current generated by the rotor coil, and providing a de-excitation path for the rotor coil to inhibit excessive peak voltage generated on the rotor coil.
2. The apparatus of claim 1, further comprising a motor stator housing, a stationary end locking screw, a rotating end locking screw, and a rotor shaft; wherein,
the static end fixing and supporting structure is fixedly arranged on the inner side of the motor stator shell;
the static end locking screw is used for adjusting a gap between a static end soft magnetic conductor and a rotating end soft magnetic conductor and locking the static end fixed supporting structure and the static end soft magnetic conductor;
the rotating end locking screw is used for locking the rotating end fixed supporting structure and the rotating end soft magnetic conductor;
the rotor rotating shaft penetrates through the fixed supporting structure of the stationary end, the fixed supporting structure of the rotating end, the locking screw of the rotating end and the rotor rotating group are fixedly installed on the rotor rotating shaft.
3. The device of claim 1 or 2, wherein the stationary end magnetically soft conductor and the rotating end magnetically soft conductor are made of ferrite or magnetic powder cores.
4. The device of claim 1, wherein the switching tube is an IGBT or MOSFET transistor.
5. The device of claim 1, wherein the control module comprises a voltage conditioning unit, a current conditioning unit, an MCU control unit, a first drive circuit, and a second drive circuit; wherein,
the voltage conditioning unit is used for conditioning the sampling voltage, generating a voltage conditioning signal and sending the voltage conditioning signal to the MCU control unit;
the current conditioning unit is used for conditioning the sampling current, generating a current conditioning signal and sending the current conditioning signal to the MCU control unit;
the MCU control unit is used for receiving the voltage conditioning signal and the current conditioning signal, calculating the current and the power of the rotor coil during working according to the voltage conditioning signal and the current conditioning signal, and generating a control signal for controlling the switching tube to control the current and the power of the rotor coil during working;
the first driving circuit receives the control signal and drives and controls the first switching tube to be switched on or switched off;
and the second driving circuit receives the control signal and drives and controls the second switching tube to be switched on or switched off.
6. The apparatus of claim 5, wherein the control module further comprises a temperature detection unit and a communication unit; wherein,
the temperature detection unit is used for detecting the temperature in the device, generating a temperature signal and sending the temperature signal to the MCU control unit;
the communication unit is used for being connected with an external control unit, acquiring an external control signal and transmitting the external control signal to the MCU control unit through a communication mode of CAN or FlexRay or 485.
7. The device of claim 6, wherein the MCU control unit is further configured to receive the temperature signal, analyze the device operating temperature through the temperature signal, generate a temperature control signal, and send the temperature control signal to the first driving circuit and the second driving circuit;
the MCU control unit also receives the external control signal and sends the external control signal to the first drive circuit and the second drive circuit.
8. A transmission method using the excitation current non-contact transmission device of the wound rotor synchronous motor according to claim 1, characterized by comprising:
the static end is connected with a power supply, is connected with the direct current of the direct current bus, and samples the voltage and the current to generate a sampled voltage and a sampled current;
receiving the sampling voltage and the sampling current, calculating the current and the power of the rotor coil during working, comparing the current and the power with a set value, and generating a control signal to control the current and the power of the rotor coil during working;
the direct current on the direct current bus is accessed, the direct current is converted into high-frequency alternating current, and the duty ratio of a control switching tube is adjusted according to the control signal so as to adjust the size of the high-frequency alternating current;
transmitting the high-frequency alternating current to the rotating end winding through a static end winding, a static end soft magnetic conductor and a rotating end soft magnetic conductor;
at the rotating end, the rotating end winding receives the high-frequency alternating current;
and rectifying the high-frequency alternating current and transmitting the rectified high-frequency alternating current to a rotor coil.
9. The method of claim 8, further comprising:
providing a path for the induced electromotive force generated by the rotor coil, storing the induced electromotive force generated by the rotor coil, and feeding back the induced electromotive force to the power supply;
and performing follow current on the exciting current generated by the rotor coil, and de-magnetizing the rotor coil to inhibit the generation of an overhigh peak voltage on the rotor coil.
10. The method of claim 8, wherein receiving the sampled voltage and the sampled current, calculating an operating current and power of the rotor coil, and generating a control signal to control the operating current and power of the rotor coil comprises:
conditioning the sampling voltage to generate a voltage conditioning signal;
conditioning the sampling current to generate a current conditioning signal;
calculating the current and power of the rotor coil during working according to the voltage conditioning signal and the current conditioning signal, and generating a control signal for controlling the switching tube to control the current and power of the rotor coil during working;
and driving and controlling the switch tube to be switched on or switched off according to the control signal.
11. The method of claim 8, wherein receiving the sampled voltage and the sampled current, calculating an operating current and power of the rotor coil, and generating a control signal to control the operating current and power of the rotor coil further comprises:
detecting the temperature in the device and generating a temperature signal;
acquiring an external control signal according to external control;
the MCU control unit receives the temperature signal, judges and processes the temperature signal, generates a temperature control signal and sends the temperature control signal to a first drive circuit of the control module and a second drive circuit of the control module;
the MCU control unit also receives the external control signal and sends the external control signal to a first drive circuit of the control module and a second drive circuit of the control module.
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| CN201310125658.0A CN103199637B (en) | 2013-04-11 | 2013-04-11 | Wound-rotor synchronous motor exciting current non-contact type transmitting device and method thereof |
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| CN103560632B (en) * | 2013-11-04 | 2016-04-06 | 东南大学 | A kind of brushless excitation mechanism based on electric energy wireless transmission |
| CN104993616B (en) * | 2015-07-01 | 2017-08-25 | 王雨川 | Transformer type rotary power source |
| CN105007471B (en) * | 2015-08-17 | 2017-09-15 | 朱世龙 | Free rotary type camera device |
| CN111082544A (en) * | 2020-03-05 | 2020-04-28 | 刘福华 | Wireless motor |
| CN111554494B (en) * | 2020-04-29 | 2021-07-30 | 河海大学 | A Rotary Magnetic Coupling Transformer Based on Magnetic Integration |
| CN117944859A (en) * | 2024-03-08 | 2024-04-30 | 无锡卡斯博科技有限公司 | A contactless partition wall driven underwater propeller |
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| CN101075499A (en) * | 2007-06-26 | 2007-11-21 | 南京航空航天大学 | Non-contacting rotary power-supply converter |
| AU2008353278A1 (en) * | 2008-03-17 | 2009-09-24 | Powermat Technologies Ltd. | Inductive transmission system |
| CN102364863B (en) * | 2011-11-17 | 2013-12-11 | 东南大学 | High-frequency power system for wireless power transmission device |
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