WO2024185339A1 - 制御装置、巻線切替システム、車両、制御方法、及び制御プログラム - Google Patents

制御装置、巻線切替システム、車両、制御方法、及び制御プログラム Download PDF

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Publication number
WO2024185339A1
WO2024185339A1 PCT/JP2024/002542 JP2024002542W WO2024185339A1 WO 2024185339 A1 WO2024185339 A1 WO 2024185339A1 JP 2024002542 W JP2024002542 W JP 2024002542W WO 2024185339 A1 WO2024185339 A1 WO 2024185339A1
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Prior art keywords
zero
switching
windings
winding
connection state
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PCT/JP2024/002542
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English (en)
French (fr)
Japanese (ja)
Inventor
弘樹 篠倉
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Sumitomo Wiring Systems Ltd
AutoNetworks Technologies Ltd
Sumitomo Electric Industries Ltd
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Sumitomo Wiring Systems Ltd
AutoNetworks Technologies Ltd
Sumitomo Electric Industries Ltd
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Application filed by Sumitomo Wiring Systems Ltd, AutoNetworks Technologies Ltd, Sumitomo Electric Industries Ltd filed Critical Sumitomo Wiring Systems Ltd
Priority to CN202480015040.5A priority Critical patent/CN120787410A/zh
Priority to JP2025505120A priority patent/JPWO2024185339A1/ja
Publication of WO2024185339A1 publication Critical patent/WO2024185339A1/ja
Anticipated expiration legal-status Critical
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
    • H02P25/16—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring
    • H02P25/18—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring with arrangements for switching the windings, e.g. with mechanical switches or relays

Definitions

  • This disclosure relates to a control device, a winding switching system, a vehicle, a control method, and a control program.
  • This application claims priority to Japanese Application No. 2023-032760, filed on March 3, 2023, and incorporates by reference all of the contents of said Japanese application.
  • Patent Document 1 discloses a device that identifies a period during which the AC motor current is below a predetermined value and switches the windings during the identified period in order to prevent surge voltages.
  • the control device is a control device for controlling an AC motor capable of switching the connection state of multiple windings, and includes a determination unit that determines whether an execution condition for executing zero-cross switching, which switches the connection state of the multiple windings of the AC motor at a zero-cross point of the current flowing through the windings, is satisfied, and an instruction unit that instructs a winding switching device that switches the connection state of the multiple windings to execute the zero-cross switching when the determination unit determines that the execution condition is satisfied.
  • FIG. 1 is a diagram illustrating an example of the configuration of a winding switching system according to the first embodiment.
  • FIG. 2 is a circuit diagram showing an example of the configuration of the winding switching device according to the first embodiment.
  • FIG. 3 is a circuit diagram showing an example of the configuration of the control circuit.
  • FIG. 4 is a timing chart showing an example of transition of the states of the signals in the winding switching device according to the first embodiment.
  • FIG. 5 is a block diagram illustrating an example of a hardware configuration of the control device according to the first embodiment.
  • FIG. 6 is a functional block diagram illustrating an example of functions of the control device according to the first embodiment.
  • FIG. 7A is a graph showing an example of a change in winding current over time when the amplitude of the winding current is large.
  • FIG. 7A is a graph showing an example of a change in winding current over time when the amplitude of the winding current is large.
  • FIG. 7B is a graph showing an example of the change over time in the winding current when the amplitude of the winding current is small.
  • FIG. 8 is a timing chart showing an example of transition of the states of the signals of the winding switching device during current suppression switching control.
  • FIG. 9 is a flowchart showing an example of a motor control process performed by the control device according to the first embodiment.
  • FIG. 10 is a flowchart showing an example of current suppression switching control by the control device according to the first embodiment.
  • FIG. 11 is a circuit diagram showing an example of the configuration of a winding switching device according to the second embodiment.
  • the control device is a control device for controlling an AC motor capable of switching the connection states of multiple windings, and includes a determination unit that determines whether an execution condition for performing zero-cross switching, which switches the connection states of the multiple windings of the AC motor at a zero-cross point of a current flowing through the windings, is satisfied, and an instruction unit that instructs a winding switching device that switches the connection states of the multiple windings to perform the zero-cross switching when the determination unit determines that the execution condition is satisfied.
  • the zero-cross switching is performed when certain execution conditions are satisfied, thereby making it possible to suppress the occurrence of a surge voltage when the execution condition is not satisfied.
  • the execution condition may be that the amplitude of the current value of the current flowing through the winding exceeds a reference value. This makes it possible to suppress the occurrence of a surge voltage when the current flowing through the winding is low.
  • the instruction unit may not instruct the winding switching device to execute the zero-crossing switchover when the determination unit determines that the execution condition is not satisfied. This prevents the zero-crossing switchover from being executed when the execution condition is not satisfied, thereby suppressing the occurrence of a surge voltage.
  • control device may further include a current control unit that changes the current value of the current flowing through the AC motor when the determination unit determines that the execution condition is not satisfied, and the instruction unit may instruct the winding switching device to switch the connection state of the winding when the current value reaches a target value as a result of control of the current by the current control unit.
  • the target value may be zero. This makes it possible to suppress the occurrence of surge voltage by switching the connection state of the winding when the current value of the current flowing through the winding becomes zero.
  • the current control unit may change the current value by turning off all legs of a power converter that converts power supplied from a power source and outputs the converted power to the AC motor. In this way, by turning off all legs of the power converter, the current value of the current flowing through the winding can be changed to zero.
  • the instruction unit may not instruct the winding switching device to switch the connection state of the plurality of windings when the determination unit determines that the execution condition is not satisfied. This prevents the windings from being switched when the execution condition is not satisfied, thereby suppressing the occurrence of a surge voltage.
  • the winding switching system includes an AC motor capable of switching the connection state of multiple windings, a power converter that converts power output from a power source into AC power and supplies the AC power to the AC motor, a winding switching device for switching the connection state of the multiple windings, and a control device.
  • the control device includes a determination unit that determines whether an execution condition for performing zero-cross switching, which switches the connection state of the multiple windings of the AC motor at a zero-cross point of the current flowing through the windings, is satisfied, and an instruction unit that instructs the winding switching device to perform the zero-cross switching when the determination unit determines that the execution condition is satisfied. In this way, zero-cross switching is performed when certain execution conditions are satisfied, thereby making it possible to suppress the occurrence of surge voltage when the execution condition is not satisfied.
  • the vehicle includes an AC motor capable of switching the connection state of multiple windings, a power converter that converts power output from a power source into AC power and supplies the AC power to the AC motor, a winding switching device for switching the connection state of the multiple windings, and a control device.
  • the control device includes a determination unit that determines whether an execution condition for performing zero-cross switching, which switches the connection state of the multiple windings of the AC motor at a zero-cross point of the current flowing through the windings, is satisfied, and an instruction unit that instructs the winding switching device to perform the zero-cross switching when the determination unit determines that the execution condition is satisfied. In this way, zero-cross switching is performed when certain execution conditions are satisfied, thereby suppressing the generation of surge voltage when the execution condition is not satisfied.
  • the control method is a control method for controlling an AC motor capable of switching the connection states of multiple windings, and includes the steps of: determining whether an execution condition for executing zero-cross switching, which switches the connection states of the multiple windings of the AC motor at a zero-cross point of a current flowing through the windings, is satisfied; and, when it is determined that the execution condition is satisfied, instructing a winding switching device that switches the connection states of the multiple windings to execute the zero-cross switching. In this way, the zero-cross switching is executed when certain execution conditions are satisfied, so that the occurrence of a surge voltage when the execution condition is not satisfied can be suppressed.
  • the control program according to this embodiment is a control program for controlling an AC motor capable of switching the connection states of multiple windings, and causes a computer to execute the steps of: determining whether an execution condition for executing zero-cross switching, which switches the connection states of the multiple windings of the AC motor at a zero-cross point of the current flowing through the windings, is satisfied; and, when it is determined that the execution condition is satisfied, instructing a winding switching device that switches the connection states of the multiple windings to execute the zero-cross switching. In this way, the zero-cross switching is executed when certain execution conditions are satisfied, thereby making it possible to suppress the occurrence of a surge voltage when the execution condition is not satisfied.
  • the present disclosure can be realized not only as a control device having the above-mentioned characteristic configuration, a winding switching system including a control device, a vehicle including a control device, a control method having steps corresponding to characteristic processes in the control device, and a control program for causing a computer to execute the characteristic processes, but also as a semiconductor integrated circuit that realizes part or all of the control device.
  • FIG. 1 is a diagram illustrating an example of the configuration of a winding switching system according to the first embodiment.
  • the winding switching system 10 is mounted on a vehicle (hereinafter referred to as an "electric vehicle") that is propelled by a motor, such as an electric vehicle or a plug-in hybrid vehicle.
  • the winding switching system 10 includes a motor 20, a power converter 30, a battery 40, a control device 50, and a winding switching device 100.
  • the motor 20 is a driving motor that generates propulsive force for the electric vehicle.
  • the motor 20 is driven by three-phase AC power.
  • One example of the motor 20 is a permanent magnet synchronous motor.
  • the battery 40 is a battery that supplies power to drive the motor 20.
  • the battery 40 is a secondary battery, for example a lithium ion battery.
  • the power converter 30 is an inverter that converts DC power supplied from the battery 40 into three-phase AC power.
  • the power converter 30 may also have the function of converting the three-phase AC power output when the motor 20 functions as a generator into DC power and charging the battery 40.
  • the power converter 30 includes legs for the U, V, and W phases.
  • the U-phase leg includes switches 31u and 32u
  • the V-phase leg includes switches 31v and 32v
  • the W-phase leg includes switches 31w and 32w.
  • the switches 31u, 32u, 31v, 32v, 31w, and 32w perform switching to convert DC power into three-phase AC power.
  • the switches 31u, 32u, 31v, 32v, 31w, and 32w are, for example, IGBTs (Insulated Gate Bipolar Transistors) or power MOSFETs (Metal Oxide Semiconductor Field-Effect Transistors).
  • Power line 35u corresponding to U phase extends from the U phase leg
  • power line 35v corresponding to V phase extends from the V phase leg
  • power line 35w corresponding to W phase extends from the W phase leg.
  • current sensor 33u is provided on power line 35u
  • current sensor 33v is provided on power line 35v
  • current sensor 33w is provided on power line 35w.
  • Current sensor 33u detects the current value of current Iu of U phase.
  • Current sensor 33v detects the current value of current Iv of V phase.
  • Current sensor 33w detects the current value of current Iw of W phase.
  • Current sensors 33u, 33v, 33w can detect the current values of currents Iu, Iv, Iw flowing in power lines 35u, 35v, 35w, including DC and AC components.
  • the current sensors 33u, 33v, and 33w are, for example, DCCTs (direct current transformers) or shunt resistors.
  • the control device 50 controls the power converter 30 and the winding switching device 100. Specifically, signal lines extend from the control device 50 to each of the switches 31u, 32u, 31v, 32v, 31w, and 32w, and the control device 50 controls the on/off timing of the switches 31u, 32u, 31v, 32v, 31w, and 32w. A signal line extends from the control device 50 to the winding switching device 100, and the control device 50 outputs a switching command signal to instruct the winding switching device 100 to switch the connection state of the windings.
  • FIG. 2 is a circuit diagram showing an example of the configuration of the winding switching device according to the first embodiment.
  • the motor 20 includes a plurality of windings 21u, 22u, 21v, 22v, 21w, and 22w.
  • the windings 21u and 22u correspond to the U phase
  • the windings 21v and 22v correspond to the V phase
  • the windings 21w and 22w correspond to the W phase.
  • the number of windings for each phase is not limited to two, and may be three or more.
  • the windings 22u, 22v, and 22w are connected at a neutral point 23.
  • the winding switching device 100 switches the connection state of the windings 21u, 22u, 21v, 22v, 21w, and 22w for each phase between a series connection state and a parallel connection state.
  • the winding switching device 100 includes current sensors 101u, 101v, and 101w, zero-cross detection circuits 102u, 102v, and 102w, control circuits 103u, 103v, and 103w, and switching circuits 104u, 104v, and 104w.
  • the zero-cross detection circuits 102u, 102v, and 102w detect the zero-cross point (the point at which the AC signal output from the current sensors 101u, 101v, and 101w crosses the zero reference voltage) of the measurement value of the current sensors 101u, 101v, and 101w.
  • the zero-cross detection circuits 102u, 102v, and 102w compare the output voltage from the current sensors 101u, 101v, and 101w with zero voltage, and detect the point at which the output voltage from the current sensors 101u, 101v, and 101w matches the zero voltage as the zero-cross point.
  • the zero voltage is an example of a reference voltage.
  • the reference voltage is a voltage corresponding to the output voltage of the current sensors 101u, 101v, and 101w when the current flowing through the windings 21u, 22u, 21v, 22v, 21w, and 22w becomes zero current, and is not limited to zero voltage.
  • the zero-cross detection circuits 102u, 102v, and 102w are examples of a detection unit.
  • the switching circuits 104u, 104v, and 104w switch the connection state of the windings 21u, 22u, 21v, 22v, 21w, and 22w between a series connection state and a parallel connection state when the zero-cross detection circuits 102u, 102v, and 102w detect a zero-cross point.
  • the switching circuits 104u, 104v, and 104w are an example of a switching unit.
  • the series connection state is an example of a first connection state
  • the parallel connection state is an example of a second connection state.
  • Power line 35u is connected to one end of winding 21u.
  • Power line 212u extends from the other end of winding 21u.
  • Power line 221u extends from one end of winding 22u, and power line 222u extends from the other end.
  • the switching circuit 104u includes semiconductor relays 111u, 112u, and 113u.
  • the semiconductor relays 111u, 112u, and 113u are, for example, IGBTs or power MOSFETs.
  • the power line 35u is drawn into the winding switching device 100. Inside the winding switching device 100, the power line 35u branches at a midpoint and is connected to a first terminal of a semiconductor relay 111u. The second terminal of the semiconductor relay 111u is connected to a first terminal of a semiconductor relay 112u. A power line 221u extending from the winding 22u is connected to the connection point between the second terminal of the semiconductor relay 111u and the first terminal of the semiconductor relay 112u.
  • the second terminal of the semiconductor relay 112u is connected to the first terminal of the semiconductor relay 113u.
  • a power line 212u extending from the winding 21u is connected to the connection point between the second terminal of the semiconductor relay 112u and the first terminal of the semiconductor relay 113u.
  • a power line 222u extending from the winding 22u is connected to the second terminal of the semiconductor relay 113u.
  • the windings 21u and 22u are connected in series.
  • the semiconductor relays 111u and 113u are in the ON state and the semiconductor relay 112u is in the OFF state, the windings 21u and 22u are connected in parallel.
  • a signal line extending from the control circuit 103u is connected to each of the gate terminals of the semiconductor relays 111u, 112u, and 113u.
  • the power lines 212u, 221u, and 222u extend from the motor 20 and are drawn into the winding switching device 100.
  • a current sensor 101u is attached to the power line 221u.
  • the current sensor 101u may be attached to the power lines 35u, 212u, or 222u instead of the power line 221u.
  • the current sensor 101u detects the U-phase current flowing through the power line 221u.
  • the current sensor 101u is, for example, an ACCT that detects only the AC component of the current.
  • the signal line extending from the current sensor 101u is connected to the zero-cross detection circuit 102u.
  • a signal line transmitting the output signal of the zero-cross detection circuit 102u (hereinafter referred to as the "zero-cross detection signal") extends from the zero-cross detection circuit 102u to the control circuit 103u.
  • a signal line extending from the control device 50 is connected to the control circuit 103u.
  • the zero-cross detection circuit 102u detects the zero-cross point of the measurement value by the current sensor 101u of the winding current flowing through the power line 221u.
  • the zero-cross detection circuit 102u is a comparator.
  • the inverting input of the comparator is set to a zero reference voltage, and the output signal of the current sensor 101u is applied to the non-inverting input.
  • the output of the comparator changes from low to high.
  • FIG. 3 is a circuit diagram showing an example of the configuration of the control circuit 103u.
  • the control circuit 103u includes AND circuits 131 and 133, a NOT circuit 132, and a latch circuit 120.
  • a signal line extending from the zero-cross detection circuit 102u is connected to a first input terminal of the AND circuit 131 and a first input terminal of the AND circuit 133.
  • a signal line extending from the control device 50 is connected to a second input terminal of the AND circuit 131.
  • the signal line from the control device 50 is connected to an input terminal of the NOT circuit 132.
  • a signal line extending from the output terminal of the NOT circuit 132 is connected to a second input terminal of the AND circuit 133.
  • the latch circuit 120 is an RS flip-flop.
  • the output terminal of the AND circuit 131 is connected to the input S (set) of the RS flip-flop 120.
  • the output terminal of the AND circuit 133 is connected to the input R (reset) of the RS flip-flop 120.
  • the RS flip-flop 120 includes two NOT circuits 121 and 123 and two NAND circuits 122 and 124. However, the RS flip-flop 120 may also be composed of two NOR circuits.
  • the output Q of the RS flip-flop 120 is connected to the gates of the semiconductor relays 111u and 113u.
  • the output Q bar of the RS flip-flop 120 is connected to the gate of the semiconductor relay 112u.
  • the zero-cross switching is an operation for switching the connection states of the windings 21u, 22u, 21v, 22v, 21w, and 22w between a series connection state and a parallel connection state at the zero-cross points of the winding currents Iu, Iv, and Iw. Note that the following description will be given representatively of the switching operation of the connection states of the windings 21u and 22u for the U phase. The same applies to the V and W phases, and therefore their description will be omitted.
  • FIG. 4 is a timing chart showing an example of the transition of the states of the signals of the winding switching device 100 according to the first embodiment.
  • the current sensor 101u measures the winding current Iu flowing through the power line 221u.
  • the zero-cross detection circuit 102u detects the zero-cross points of the measured value of the winding current Iu. That is, the zero-cross detection signal output from the zero-cross detection circuit 102u is low when the winding current Iu is not zero, and becomes high when the winding current Iu becomes zero. In FIG. 4, the zero-cross detection signal is low under normal conditions, and is high at times T1, T2, T3, and T4.
  • control device 50 sets the value of the switching command signal to Low, and when windings 21u, 22u, 21v, 22v, 21w, and 22w are connected in parallel, control device 50 sets the value of the switching command signal to High.
  • the switching command signal is Low in the initial state and changes to High at a point between times T1 and T2.
  • the switching command signal changes again to Low at a point between times T3 and T4.
  • the zero-cross detection signal and the switching command signal are input to the AND circuit 131.
  • the AND circuit 131 outputs Low when the zero-cross detection signal and the switching command signal are a combination of (Low, Low), (Low, High), and (High, Low).
  • the AND circuit 131 outputs High when the zero-cross detection signal and the switching command signal are a combination of (High, High). That is, Low is normally input to S of the RS flip-flop 120, and High is input when a zero-cross point of the winding current Iu is detected and a parallel connection command for the windings 21u, 22u, 21v, 22v, 21w, and 22w is given.
  • the input signal to S is High at times T2 and T3.
  • the zero-cross detection signal and the inverted signal of the switching command signal are input to the AND circuit 133.
  • the AND circuit 133 outputs Low when the zero-cross detection signal and the switching command signal are a combination of (Low, Low), (High, Low), and (High, High).
  • the AND circuit 133 outputs High when the zero-cross detection signal and the switching command signal are a combination of (High, Low). That is, Low is normally input to R of the RS flip-flop 120, and High is input when a zero-cross point of the winding current Iu is detected and a command to connect the windings 21u, 22u, 21v, 22v, 21w, and 22w in series is given.
  • the input signal of R is High at times T1 and T4.
  • RS flip-flop 120 holds the previous output values of Q and Q-bar when inputs S and R are Low and Low. When inputs S and R are Low and High, RS flip-flop 120 outputs Q and Q-bar as Low and High, and when inputs S and R are High and Low, Q and Q-bar as High and Low. In RS flip-flop 120, the combination of High and High inputs S and R is prohibited.
  • connection state of the windings 21u, 22u, 21v, 22v, 21w, and 22w can be switched between a series connection state and a parallel connection state at the timing of the zero-crossing points of the winding currents Iu, Iv, and Iw. Therefore, the occurrence of surge voltages is suppressed. Furthermore, there is no need for complex processing to identify the period during which the winding currents Iu, Iv, and Iw are below a predetermined value, and the winding switching device 100 can be configured without using a processor such as a CPU, FPGA, or ASIC.
  • Hardware configuration of the control device] 5 is a block diagram showing an example of a hardware configuration of the control device according to the first embodiment.
  • the control device 50 includes a processor 501, a non-volatile memory 502, a volatile memory 503, and an interface (I/F) 504.
  • the volatile memory 503 is, for example, a semiconductor memory such as SRAM (Static Random Access Memory) or DRAM (Dynamic Random Access Memory).
  • the non-volatile memory 502 is, for example, a flash memory, a hard disk, or a ROM (Read Only Memory).
  • the non-volatile memory 502 stores a motor control program 510, which is a computer program, and data used to execute the motor control program 510. Each function of the control device 50 is achieved by the motor control program 510 being executed by the processor 501.
  • the motor control program 510 can be stored in a recording medium such as a flash memory, a ROM, or a CD-ROM.
  • the processor 501 controls the power converter 30 and the winding switching device 100 using the motor control program 510.
  • the processor 501 is, for example, a CPU (Central Processing Unit). However, the processor 501 is not limited to a CPU.
  • the processor 501 may be a GPU (Graphics Processing Unit).
  • the processor 501 is, for example, a multi-core processor.
  • the processor 501 may be a single-core processor.
  • the processor 501 may be, for example, an ASIC (Application Specific Integrated Circuit), or a programmable logic device such as a gate array or an FPGA (Field Programmable Gate Array). In this case, the ASIC or the programmable logic device is configured to be capable of executing the same processing as the motor control program 510.
  • ASIC Application Specific Integrated Circuit
  • FPGA Field Programmable Gate Array
  • the I/F 504 is connected to the winding switching device 100 and the power converter 30.
  • the I/F 504 is, for example, an input/output interface or a communication interface.
  • the I/F 504 is connected to the current sensors 33u, 33v, and 33w provided in the power converter 30, and can acquire the current value of the U-phase current Iu, the current value of the V-phase current Iv, and the current value of the W-phase current Iw.
  • the I/F 504 is connected to each of the switches 31u, 32u, 31v, 32v, 31w, and 32w of the power converter 30, and can control the on/off of the switches 31u, 32u, 31v, 32v, 31w, and 32w.
  • the I/F 504 is connected to the control circuits 103u, 103v, and 103w of the winding switching device 100, and can output a switching command signal to the control circuits 103u, 103v, and 103w.
  • FIG. 6 is a functional block diagram illustrating an example of functions of the control device according to the first embodiment.
  • control device 50 executes the functions of the determination unit 521, the instruction unit 522, and the current control unit 523.
  • the determination unit 521 determines whether or not the execution conditions for executing zero-cross switching, which switches the connection state of the windings 21u, 22u, 21v, 22v, 21w, and 22w of the motor 20 at the zero-cross points of the current flowing through the windings 21u, 22u, 21v, 22v, 21w, and 22w, are met.
  • the execution condition is that the amplitude of the current value of the current flowing through the windings 21u, 22u, 21v, 22v, 21w, and 22w exceeds a reference value.
  • the reference value can be determined, for example, based on the rated current of the motor 20.
  • the reference value is a predetermined percentage (for example, 10%) of the rated current of the motor 20.
  • the reference value may be determined based on a surge voltage that occurs when the winding currents Iu, Iv, and Iw are momentarily interrupted so as not to exceed the withstand voltage of the semiconductor relays 111u, 112u, 113u, 111v, 112v, 113v, 111w, 112w, and 113w, etc.
  • FIG. 7A is a graph showing an example of the change in winding current over time when the amplitude of the winding current is large
  • FIG. 7B is a graph showing an example of the change in winding current over time when the amplitude of the winding current is small.
  • the vertical axis shows the current value
  • the horizontal axis shows time.
  • the winding current fluctuates finely due to noise. Even if the amplitude of the winding current changes, the magnitude of the noise does not change, so when the amplitude of the winding current is small, the noise becomes larger relative to the amplitude compared to when the amplitude of the winding current is large ( Figure 7A).
  • FIG. 7A and 7B shows the results of detecting the zero-crossing points.
  • the points plotted on the horizontal axis are the detection times of the zero-crossing points.
  • the amplitude of the winding current is large, the zero-crossing points are detected accurately without being affected by noise.
  • the amplitude of the winding current is small, it can be seen that the zero-crossing points are erroneously detected due to the effects of noise.
  • zero-cross switching is not performed when the detection accuracy of the zero-cross point is low and the amplitude of the winding current is small, and zero-cross switching is performed when the detection accuracy of the zero-cross point is high and the amplitude of the winding current is large. This makes it possible to suppress the generation of surge voltages caused by switching the connection state of windings 21u, 22u, 21v, 22v, 21w, and 22w at a time point other than the zero-cross point.
  • the determination unit 521 acquires the detection values of the current sensors 33u, 33v, and 33w.
  • the determination unit 521 determines the amplitude of each of the currents Iu, Iv, and Iw based on the detection values of each of the current sensors 33u, 33v, and 33w.
  • the determination unit 521 compares the amplitude of each of the currents Iu, Iv, and Iw with a reference value, and determines that the execution condition is met if the amplitude exceeds the reference value.
  • the execution condition may be determined to be met if the amplitudes of all of the currents Iu, Iv, and Iw exceed the reference value, or the execution condition may be determined to be met if the amplitude of at least one of the currents Iu, Iv, and Iw exceeds the reference value.
  • the determination unit 521 may calculate the effective values (root mean square) of the currents Iu, Iv, and Iw and compare the calculated effective values with the reference value.
  • the instruction unit 522 instructs the winding switching device 100 to execute zero-cross switching.
  • the instruction to execute zero-cross switching is given by outputting a switching command signal to the control circuits 103u, 103v, and 103w. That is, as described above, when a switching command signal is input to the control circuits 103u, 103v, and 103w, a zero-cross detection signal is output from the zero-cross detection circuits 102u, 102v, and 102w at the time of detection of the next zero-cross point, and zero-cross switching is executed.
  • the instruction unit 522 does not instruct the winding switching device 100 to execute zero-cross switching.
  • the current control unit 523 changes the current value of the current flowing through the motor 20. For example, the current control unit 523 controls the power converter 30 to bring the power values of the currents Iu, Iv, and Iw output from the power converter 30 closer to target values. For example, the target value is zero.
  • the current control unit 523 controls the voltages applied to the windings 21u, 22u, 21v, 22v, 21w, and 22w so that the AC power output to the motor becomes zero (hereinafter, also referred to as "zero current control").
  • the current control unit 523 controls the on/off of 31u, 32u, 31v, 32v, 31w, and 32w of the power converter 30 to perform this zero current control. This makes it possible to make the winding currents Iu, Iv, and Iw zero.
  • the instruction unit 522 instructs the winding switching device 100 to switch the connection state of the windings 21u, 22u, 21v, 22v, 21w, 22w. That is, the instruction unit 522 outputs a switching command signal to the winding switching device 100 at the timing when the winding currents Iu, Iv, Iw become zero.
  • the control by the control device 50 that instructs the winding switching device 100 to switch the connection state of the windings 21u, 22u, 21v, 22v, 21w, 22w after suppressing the winding currents Iu, Iv, Iw to zero is hereinafter referred to as "current suppression switching control”.
  • FIG. 8 is a timing chart showing an example of the transition of the states of the signals of the winding switching device 100 during current suppression switching control.
  • the current sensor 101u measures the winding current Iu flowing through the power line 221u.
  • the zero-cross detection circuit 102u detects the zero-cross points of the measured value of the winding current Iu. If the amplitude of the winding current Iu is small, the zero-cross detection circuit 102u may erroneously detect a point other than the zero-cross point as the zero-cross point.
  • the control device 50 controls the current value of the winding current Iu to zero during the period P0 from time T11 to T13 by the zero current control described above. During the period P0 in which the current value of the winding current Iu is zero (hereinafter also referred to as the "zero current period"), the output of the zero-crossing detection circuit 102u becomes High.
  • the control device 50 switches the switching command signal from Low to High at time T12 during the zero current period P0. That is, in this example, the switching command signal is Low in the initial state and changes to High at time T12.
  • the AND circuit 131 If the zero-cross detection signal and the switching command signal are a combination of (High, Low) during the zero current period P0, the AND circuit 131 outputs Low. If the zero-cross detection signal and the switching command signal are a combination of (High, High), the AND circuit 131 outputs High. That is, from time T11 to time T12, Low is input to S of the RS flip-flop 120, and from time T12 to time T13, High is input to S of the RS flip-flop 120.
  • the AND circuit 133 If the zero-cross detection signal and the switching command signal are a combination of (High, Low) during the zero current period P0, the AND circuit 133 outputs High. If the zero-cross detection signal and the switching command signal are a combination of (High, High), the AND circuit 133 outputs Low. That is, from time T11 to time T12, High is input to R of the RS flip-flop 120, and from time T12 to time T13, Low is input to S of the RS flip-flop 120.
  • connection state of the windings 21u, 22u, 21v, 22v, 21w, and 22w can be switched between a series connection state and a parallel connection state. This suppresses the occurrence of surge voltage.
  • control device 50 executes a motor control process by the processor 501 executing a motor control program 510.
  • FIG. 9 is a flowchart showing an example of motor control processing by the control device according to the first embodiment.
  • Current sensors 33u, 33v, 33w detect the current values of winding currents Iu, Iv, Iw. Detection signals from current sensors 33u, 33v, 33w are input to control device 50. Current sensors 33u, 33v, 33w detect current values continuously over time. Processor 501 acquires the current values of winding currents Iu, Iv, Iw at a predetermined cycle (step S101).
  • the processor 501 determines whether the execution condition is met (step S102). That is, the processor 501 determines the amplitude of the current from the current values of the winding currents Iu, Iv, and Iw, and determines whether the determined amplitude exceeds a reference value.
  • step S102 the processor 501 instructs the winding switching device 100 to perform zero-cross switching (step S103). That is, the processor 501 outputs a switching command signal to each of the control circuits 103u, 103v, and 103w of the winding switching device 100. This causes zero-cross switching to be performed. In this case, the motor control process ends here.
  • step S104 If the execution condition is not met (NO in step S102), the processor 501 executes the current suppression switching control (step S104).
  • FIG. 10 is a flowchart showing an example of current suppression switching control by the control device according to the first embodiment.
  • the processor 501 performs switching control of the switches 31u, 32u, 31v, 32v, 31w, and 32w of the power converter 30, and executes zero current control. This changes the winding currents Iu, Iv, and Iw to zero (step S201).
  • the processor 501 When the current values of the winding currents Iu, Iv, and Iw reach zero, the processor 501 outputs a switching command signal to each of the control circuits 103u, 103v, and 103w of the winding switching device 100 (step S202). As a result, with the current values of the winding currents Iu, Iv, and Iw at zero, the connection state of the windings 21u, 22u, 21v, 22v, 21w, and 22w switches from a parallel connection state to a series connection state, or from a series connection state to a parallel connection state.
  • the processor 501 ends the zero current control and restores the current values of the winding currents Iu, Iv, and Iw (step S203). This completes the current suppression switching control.
  • the winding switching device of the second embodiment switches the connection state of the multiple windings of a motor between a full connection state in which all of the multiple windings are connected, and a partial connection state in which some of the multiple windings are connected.
  • FIG. 11 is a circuit diagram showing an example of the configuration of a winding switching device according to the second embodiment.
  • Motor 20A includes a plurality of windings 24u, 25u, 24v, 25v, 24w, and 25w. Windings 24u and 25u correspond to the U phase, windings 24v and 25v correspond to the V phase, and windings 24w and 25w correspond to the W phase. However, the number of windings for each phase is not limited to two, and may be three or more.
  • the winding switching device 100A switches the connection state of the windings 24u, 25u, 24v, 25v, 24w, and 25w for each phase between a fully connected state and a partially connected state.
  • the winding switching device 100A includes current sensors 131u, 131v, and 131w, zero-cross detection circuits 102u, 102v, and 102w, control circuits 103u, 103v, and 103w, and switching circuits 140u, 140v, and 140w.
  • the zero-cross detection circuits 102u, 102v, and 102w detect the zero-cross points of the measured values of the current sensors 131u, 131v, and 131w.
  • the configuration of the zero-cross detection circuits 102u, 102v, and 102w is the same as that of the first embodiment, so a description thereof will be omitted.
  • the switching circuits 140u, 140v, and 140w switch the connection state of the windings 24u, 25u, 24v, 25v, 24w, and 25w between a full connection state and a partial connection state when the zero-cross detection circuits 102u, 102v, and 102w detect a zero-cross point.
  • the switching circuits 140u, 140v, and 140w are an example of a switching unit.
  • the full connection state is an example of a first connection state
  • the partial connection state is an example of a second connection state.
  • Power line 35u is connected to one end of winding 24u.
  • the other end of winding 24u and one end of winding 25u are connected to each other, and power line 241u extends from the midpoint between winding 24u and winding 25u.
  • Power line 241u branches into power lines 242u and 243w.
  • Power line 251u extends from the other end of winding 25u.
  • Power line 251u branches into power lines 252u and 253w.
  • Power line 35v is connected to one end of winding 24v.
  • the other end of winding 24v and one end of winding 25v are connected to each other, and power line 241v extends from the midpoint between winding 24v and winding 25v.
  • Power line 241v branches into power lines 242v and 243u.
  • Power line 251v extends from the other end of winding 25v.
  • Power line 251v branches into power lines 252v and 253u.
  • Power line 35w is connected to one end of winding 24w.
  • the other end of winding 24w and one end of winding 25w are connected to each other, and power line 241w extends from the midpoint between winding 24w and winding 25w.
  • Power line 241w branches into power lines 242w and 243v.
  • Power line 251w extends from the other end of winding 25w.
  • Power line 251w branches into power lines 252w and 253v.
  • the switching circuit 140u includes semiconductor relays 141u and 142u.
  • the switching circuit 140v includes semiconductor relays 141v and 142v.
  • the switching circuit 140w includes semiconductor relays 141w and 142w.
  • the semiconductor relays 141u, 142u, 141v, 142v, 141w, and 142w are, for example, IGBTs or power MOSFETs.
  • the first terminal of the semiconductor relay 141u is connected to the power line 242u, and the second terminal is connected to the power line 243u.
  • the first terminal of the semiconductor relay 142u is connected to the power line 252u, and the second terminal is connected to the power line 253u.
  • the connection relationship between the switching circuits 140v and 140w is the same as that of the switching circuit 140u, so a description is omitted.
  • the power line 35u is drawn into the winding switching device 100.
  • a current sensor 131u is attached to the power line 35u.
  • the current sensor 131u detects the U-phase current flowing through the power line 35u.
  • the current sensor 131u is, for example, an ACCT that detects only the AC component of the current.
  • a signal line extending from the current sensor 131u is connected to the zero-cross detection circuit 102u. The same applies to the V-phase and W-phase.
  • the output Q of the RS flip-flop 120 in the control circuit 103u is connected to the gate of the semiconductor relay 141u.
  • the output Q bar of the RS flip-flop 120 is connected to the gate of the semiconductor relay 142u. The same is true for the V phase and the W phase.
  • winding switching device 100A according to the second embodiment are similar to those of the winding switching device 100 according to the first embodiment, so the same components are given the same reference numerals and their description is omitted.
  • control device 50 sets the value of the switching command signal to Low when the windings 24u, 25u, 24v, 25v, 24w, and 25w of the motor 20 are to be fully connected, and sets the value of the switching command signal to High when the windings 24u, 25u, 24v, 25v, 24w, and 25w are to be partially connected.
  • connection state of windings 21u, 22u, 21v, 22v, 21w, and 22w can be switched between a fully connected state and a partially connected state at the timing of the zero-crossing points of winding currents Iu, Iv, and Iw.
  • the configuration and operation of the power converter 30 and control device 50 according to the second embodiment are similar to those of the power converter 30 and control device 50 according to the first embodiment, and therefore will not be described.
  • the current control unit 523 of the control device 50 changes the current value by turning off all legs in the power converter 30. That is, the current control unit 523 turns off all of the switches 31u, 32u, 31v, 32v, 31w, and 32w. As a result, the current values of the winding currents Iu, Iv, and Iw change to zero.
  • control device 50 according to the third embodiment are similar to those of the control device 50 according to the first embodiment, and therefore will not be described.
  • Other configurations of the winding switching system according to the third embodiment are similar to those of the winding switching system 10 according to the first embodiment, and therefore will not be described.
  • the instruction unit 522 of the control device 50 does not instruct the winding switching device 30 to switch the connection states of the windings 21u, 22u, 21v, 22v, 21w, and 22w when the determination unit 521 determines that the execution condition is not satisfied. In other words, when the execution condition is not satisfied, the instruction unit 522 does not output a switching command signal to the control circuits 103u, 103v, and 103w of the winding switching device 100. This makes it possible to suppress the occurrence of a surge voltage.
  • Winding switching system 20 Motor 21u, 22u, 21v, 22v, 21w, 22w Winding 23 Neutral point 25 Power line 30 Power converter 31u, 32u, 31v, 32v, 31w, 32w Switch 33u, 33v, 33w Current sensor 35u, 35v, 35w Power line 40 Battery 50 Control device 501 Processor 502 Non-volatile memory 503 Volatile memory 504 Interface (I/F) 510 Motor control program 521 Determination unit 522 Instruction unit 523 Current control unit 100 Winding switching device 101u, 101v, 101w Current sensor 102u, 102v, 102w Zero cross detection circuit 103u, 103v, 103w Control circuit 104u, 104v, 104w Switching circuit 111u, 112u, 113u, 111v, 112v, 113v, 111w, 112w, 113w Semiconductor relay 212u, 221u, 222u, 212v, 221v, 222v, 212w, 221w, 2

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Ac Motors In General (AREA)
PCT/JP2024/002542 2023-03-03 2024-01-29 制御装置、巻線切替システム、車両、制御方法、及び制御プログラム Ceased WO2024185339A1 (ja)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020043740A (ja) * 2018-09-13 2020-03-19 マツダ株式会社 電動発電機の制御装置
WO2021181641A1 (ja) * 2020-03-12 2021-09-16 東芝キヤリア株式会社 モータ駆動装置および冷凍サイクル装置
WO2021210129A1 (ja) * 2020-04-16 2021-10-21 三菱電機株式会社 駆動装置及び空気調和装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020043740A (ja) * 2018-09-13 2020-03-19 マツダ株式会社 電動発電機の制御装置
WO2021181641A1 (ja) * 2020-03-12 2021-09-16 東芝キヤリア株式会社 モータ駆動装置および冷凍サイクル装置
WO2021210129A1 (ja) * 2020-04-16 2021-10-21 三菱電機株式会社 駆動装置及び空気調和装置

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