WO2024009558A1 - 巻線切替装置及び巻線切替システム - Google Patents

巻線切替装置及び巻線切替システム Download PDF

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Publication number
WO2024009558A1
WO2024009558A1 PCT/JP2023/008040 JP2023008040W WO2024009558A1 WO 2024009558 A1 WO2024009558 A1 WO 2024009558A1 JP 2023008040 W JP2023008040 W JP 2023008040W WO 2024009558 A1 WO2024009558 A1 WO 2024009558A1
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Prior art keywords
winding
connection state
switching device
current sensor
windings
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PCT/JP2023/008040
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English (en)
French (fr)
Japanese (ja)
Inventor
将岐 津田
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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 CN202380047947.5A priority Critical patent/CN119404428A/zh
Priority to JP2024531921A priority patent/JPWO2024009558A1/ja
Publication of WO2024009558A1 publication Critical patent/WO2024009558A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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

  • the present disclosure relates to a winding switching device and a winding switching system.
  • This application claims priority based on Japanese Application No. 2022-109213 filed on July 6, 2022, and incorporates all the contents described in the said Japanese application.
  • Patent Document 1 discloses a device that specifies a period in which an alternating current motor current is below a predetermined value and switches the windings during the specified period in order to prevent surge voltage.
  • a winding switching device changes the connection state of the plurality of windings of a motor capable of switching the connection state of the plurality of windings between a first connection state and a second connection state.
  • the winding switching device for switching includes: a detection unit that detects a zero-crossing point of a measured value of a current sensor that measures the current flowing in the winding; A switching unit that switches the connection state of the winding between the first connection state and the second connection state.
  • FIG. 1 is a diagram showing an example of the configuration of a winding switching system according to a 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 illustrating an example of the state transition of each signal of the winding switching device according to the first embodiment.
  • FIG. 5 is a circuit diagram showing an example of the configuration of the winding switching device according to the second embodiment.
  • FIG. 6 is a circuit diagram showing an example of the configuration of a winding switching device according to a third embodiment.
  • FIG. 7 is a circuit diagram showing an example of the configuration of the correction circuit.
  • FIG. 1 is a diagram showing an example of the configuration of a winding switching system according to a 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
  • FIG. 8A is a graph showing the waveforms of the voltage signal from the current sensor and the voltage signal from the filter.
  • FIG. 8B is a graph showing the waveform of the voltage signal from the subtraction circuit.
  • FIG. 9 is a circuit diagram showing a modified example of the configuration of the winding switching device according to the third embodiment.
  • FIG. 10 is a circuit diagram showing an example of the configuration of a winding switching device according to a fourth embodiment.
  • a processor such as a microcomputer, FPGA (Field-Programmable Gate Array), or ASIC (Application Specific Integrated Circuit) identifies a period during which the motor current is below a predetermined value.
  • FPGA Field-Programmable Gate Array
  • ASIC Application Specific Integrated Circuit
  • the winding switching device is configured to change the connection state of the plurality of windings of the motor capable of switching the connection state of the plurality of windings between a first connection state and a second connection state.
  • a winding switching device for switching a winding comprising: a detection unit that detects a zero-crossing point of a measured value of a current sensor that measures the current flowing through the winding; a switching unit that switches the connection state of the winding between the first connection state and the second connection state.
  • the motor is a multiphase AC motor
  • the detection unit detects the zero cross point for each phase
  • the switching unit changes the connection state of the plurality of windings to the It is also possible to switch between the first connection state and the second connection state for each phase. Thereby, the connection state of the windings is switched at the zero cross point for each phase, so it is possible to suppress the generation of surge voltage in each phase.
  • the detection unit is configured to set a standard corresponding to the output voltage from the current sensor and the output voltage of the current sensor when the current flowing through the winding becomes zero current.
  • the voltage may be compared with the reference voltage, and the point in time when the output voltage from the current sensor matches the reference voltage may be detected as a zero-crossing point.
  • the detection section may be a comparator.
  • the detection section can be configured with an inexpensive comparator.
  • the detection unit is a power converter that converts DC power output from a battery into AC power and supplies the AC power to the motor.
  • the control and the current sensor may be used in common. This allows the number of current sensors to be reduced in the entire system, resulting in an even more inexpensive configuration.
  • the current sensor may be disposed within the winding switching device. Thereby, the winding switching device alone can measure the current flowing through the winding and detect the zero cross point.
  • the current sensor may be an AC current transformer. If only to detect the zero-crossing point of the winding current, an AC current transformer (ACCT) that can only measure the AC component of the current can be used. Therefore, generation of surge voltage can be suppressed with an inexpensive configuration.
  • AC current transformer AC current transformer
  • a signal line arranged in the power converter and extending from the current sensor may be connected to the detection section. Thereby, the zero-crossing point of the winding current can be detected using the current sensor provided in the power converter.
  • the winding switching device further includes a correction section that removes a DC component from the output signal of the current sensor
  • the detection section further includes a correction section that removes the DC component from the output signal of the current sensor.
  • a zero-crossing point of the output signal of the current sensor may be detected. Thereby, the DC component can be removed from the output signal of the current sensor, and the zero-crossing point can be detected accurately.
  • the winding switching system includes a motor capable of switching the connection state of a plurality of windings between a first connection state and a second connection state, and DC power output from a battery.
  • a power converter that converts the AC power into alternating current power and supplies the alternating current power to the motor
  • a winding switching device for switching connection states of the plurality of windings, the winding switching device a detection unit that detects a zero-crossing point of a measured value of a current sensor that measures a current flowing through a winding; and a detection unit that detects a zero-crossing point of a measured value of a current sensor that measures a current flowing through a winding, and changes the connection state of the plurality of windings to the first connection state and A switching unit that switches between the second connection state.
  • the present disclosure not only can be realized as a winding switching device having the above-described characteristic configuration and a winding switching system including the winding switching device, but also can realize the characteristic processing in the winding switching device as a step.
  • the present invention can be implemented as a winding switching method, a computer program for causing a computer to execute characteristic processing, or a semiconductor integrated circuit that implements part or all of a winding switching device.
  • FIG. 1 is a diagram showing an example of the configuration of a winding switching system according to a first embodiment.
  • the winding switching system 10 is installed in a motor-propelled vehicle (hereinafter referred to as an "electric vehicle") such as an electric vehicle or a plug-in hybrid vehicle.
  • 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.
  • Motor 20 is driven by three-phase AC power.
  • An example of motor 20 is a permanent magnet synchronous motor.
  • the battery 40 is a battery for supplying electric power to drive the motor 20.
  • the battery 40 is a secondary battery, such as 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 have a function of converting three-phase AC power outputted when the motor 20 functions as a generator into DC power, and charging the battery 40.
  • the power converter 30 includes legs for each of the U-phase, V-phase, and W-phase.
  • 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.
  • DC power is converted into three-phase AC power by switching the switches 31u, 32u, 31v, 32v, 31w, and 32w.
  • 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).
  • a power line 35u corresponding to the U phase extends from the U phase leg, a power line 35v corresponding to the V phase extends from the V phase leg, and a power line 35w corresponding to the W phase extends from the W phase leg.
  • the power line 35u is provided with a current sensor 33u
  • the power line 35v is provided with a current sensor 33v
  • the power line 35w is provided with a current sensor 33w.
  • Current sensor 33u detects the current value of U-phase current Iu.
  • Current sensor 33v detects the current value of V-phase current Iv.
  • Current sensor 33w detects the current value of W-phase current Iw.
  • Current sensors 33u, 33v, 33w can detect current values of currents Iu, Iv, Iw flowing through power lines 35u, 35v, 35w, including DC components and AC components.
  • the current sensors 33u, 33v, and 33w are, for example, DCCT (direct current transformers) or shunt resistors.
  • the winding switching device 100 is arranged between the motor 20 and the power converter 30. However, the position of winding switching device 100 is not limited to between motor 20 and power converter 30.
  • the power converter 30 and the winding switching device 100 are connected by power lines 35u, 35v, and 35w, and the winding switching device 100 and the motor 20 are connected by a plurality of power lines 25.
  • the winding switching device 100 switches the connection state of a plurality of windings of the motor 20. The configuration of the winding switching device 100 will be described later.
  • Three-phase alternating currents Iu, Iv, and Iw output from the power converter 30 are supplied to the motor 20 via the winding switching device 100.
  • 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 turns on/off the switches 31u, 32u, 31v, 32v, 31w, and 32w. Control off timing. 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 for instructing the winding switching device 100 to switch the connection state of the windings.
  • the control device 50 includes a processor, memory, input/output interface, communication interface, etc. (not shown).
  • the processor is, for example, a CPU (Central Processing Unit). However, the processor is not limited to a CPU.
  • the processor may be a GPU (Graphics Processing Unit).
  • the processor 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).
  • FIG. 2 is a circuit diagram showing an example of the configuration of the winding switching device according to the first embodiment.
  • 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 in each phase is not limited to two, and may be three or more.
  • Windings 22u, 22v, 22w are connected at neutral point 23.
  • the winding switching device 100 switches the connection state of the windings 21u, 22u, 21v, 22v, 21w, and 22w between a series connection state and a parallel connection state for each phase.
  • Winding switching device 100 includes current sensors 101u, 101v, 101w, zero-cross detection circuits 102u, 102v, 102w, control circuits 103u, 103v, 103w, and switching circuits 104u, 104v, 104w.
  • the zero-crossing detection circuits 102u, 102v, and 102w detect zero-crossing points of the measured values of the current sensors 101u, 101v, and 101w.
  • the zero cross detection circuits 102u, 102v, 102w compare the output voltages from the current sensors 101u, 101v, 101w with zero voltage, and the output voltages from the current sensors 101u, 101v, 101w are zero voltage.
  • the time point that coincides with is detected as a zero crossing point.
  • 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, 101w when the current flowing through the windings 21u, 22u, 21v, 22v, 21w, 22w becomes zero current, and is not limited to zero voltage.
  • Zero cross detection circuits 102u, 102v, and 102w are examples of detection units.
  • the switching circuits 104u, 104v, 104w change the connection state of the windings 21u, 22u, 21v, 22v, 21w, 22w between a series connection state and a parallel connection state at the timing when the zero cross detection circuits 102u, 102v, 102w detect a zero cross point. Switch between.
  • the switching circuits 104u, 104v, and 104w are examples of switching units.
  • the series connection state is an example of the first connection state
  • the parallel connection state is an example of the second connection state.
  • connection relationship between the winding switching device 100, the power line 35u, and the motor 20 will be described as a representative for the U phase. Since the V phase and W phase are the same, their explanation will be omitted.
  • the power line 35u is connected to one end of the winding 21u.
  • a power line 212u extends from the other end of the winding 21u.
  • a power line 221u extends from one end of the winding 22u, and a power line 222u extends from the other end.
  • the switching circuit 104u includes semiconductor relays 111u, 112u, and 113u.
  • Semiconductor relays 111u, 112u, 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 an intermediate point and is connected to a first terminal of a semiconductor relay 111u. The second terminal of semiconductor relay 111u is connected to the first terminal of semiconductor relay 112u. A power line 221u extending from the winding 22u is connected to a connection point between the second terminal of the semiconductor relay 111u and the first terminal of the semiconductor relay 112u.
  • the second terminal of semiconductor relay 112u is connected to the first terminal of semiconductor relay 113u.
  • a power line 212u extending from the winding 21u is connected to a 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.
  • 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 line 35u, 212u, or 222u instead of the power line 221u.
  • Current sensor 101u detects the U-phase current flowing through power line 221u.
  • the current sensor 101u is, for example, an ACCT that detects only the alternating current component of current.
  • a signal line extending from the current sensor 101u is connected to a zero-cross detection circuit 102u.
  • a signal line that transmits the output signal of the zero-cross detection circuit 102u (hereinafter referred to as "zero-cross detection signal”) extends from the zero-cross detection circuit 102u to the control circuit 103u. Further, a signal line extending from the control device 50 is connected to the control circuit 103u.
  • the zero-crossing detection circuit 102u detects the zero-crossing point of the measured value of the winding current flowing in the power line 221u by the current sensor 101u.
  • Zero cross detection circuit 102u is a comparator.
  • the inverting input of the comparator is set to zero reference voltage, and the output signal of current sensor 101u is applied to the non-inverting input.
  • the output of the comparator changes from Low to High at the time when the AC signal output from the current sensor 101u crosses the zero reference voltage (zero cross point).
  • FIG. 3 is a circuit diagram showing an example of the configuration of the control circuit 103u.
  • Control circuit 103u includes AND circuits 131 and 133, NOT circuit 132, and 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.
  • a 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 an 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.
  • 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 be configured with two NOR circuits.
  • the output Q of the RS flip-flop 120 is connected to the gates of 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 latch circuit 120 may be configured with a D flip-flop instead of the RS flip-flop.
  • FIG. 4 is a timing chart showing an example of the transition of the state of each signal 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-crossing detection circuit 102u detects the zero-crossing point 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 during normal times, and High at times T1, T2, T3, and T4.
  • the control device 50 sets the value of the switching command signal to Low, and connects the windings 21u, 22u, 21v, 22v, 21w, When connecting 22W in parallel, the value of the switching command signal is set to High.
  • the switching command signal is Low in the initial state, and changes to High at some point between time T1 and T2. The switching command signal changes to Low again at some 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-crossing detection signal and the switching command signal are combinations of (Low, Low), (Low, High), and (High, Low).
  • the AND circuit 131 outputs High when the zero-crossing 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, the 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. High is input when the signal is input. In FIG. 4, the input signal of S is High at times T2 and T3.
  • the zero-crossing 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 combinations of (Low, Low), (High, Low), and (High, High).
  • the AND circuit 133 outputs High when the zero-crossing 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, the zero cross point of the winding current Iu is detected, and a series connection command for the windings 21u, 22u, 21v, 22v, 21w, and 22w is given. High is input when the signal is input. In FIG. 4, the R input signal is High at times T1 and T4.
  • the RS flip-flop 120 holds the previous output values of Q and Q bar when the inputs S and R are Low and Low. In the RS flip-flop 120, when the inputs S and R are Low and High, the Q and Q bars output Low and High, and when the inputs S and R are High and Low, the Q and Q bars output High and Low. do. In the 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 the series connection state and the parallel connection state at the timing of the zero cross point of the winding currents Iu, Iv, and Iw. . Therefore, generation of surge voltage is suppressed. Furthermore, there is no need for complicated processing such as identifying 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. can do.
  • the winding switching device changes the connection state of the plurality of windings of the motor into a fully connected state in which all of the plurality of windings are connected, and a partially connected state in which a part of the plurality of windings is connected. Switch between.
  • FIG. 5 is a circuit diagram showing an example of the configuration of a winding switching device according to the second embodiment.
  • Motor 20A includes multiple windings 24u, 25u, 24v, 25v, 24w, and 25w.
  • the windings 24u and 25u correspond to the U phase
  • the windings 24v and 25v correspond to the V phase
  • the windings 24w and 25w correspond to the W phase.
  • the number of windings in 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 between a fully connected state and a partially connected state for each phase.
  • the winding switching device 100A includes current sensors 131u, 131v, 131w, zero-cross detection circuits 102u, 102v, 102w, control circuits 103u, 103v, 103w, and switching circuits 140u, 140v, 140w.
  • the zero-crossing detection circuits 102u, 102v, and 102w detect zero-crossing points of the measured values of the current sensors 131u, 131v, and 131w.
  • the configurations of the zero-crossing detection circuits 102u, 102v, and 102w are the same as those in the first embodiment, so a description thereof will be omitted.
  • the switching circuits 140u, 140v, 140w change the connection state of the windings 24u, 25u, 24v, 25v, 24w, 25w into a fully connected state and a partially connected state at the timing when the zero cross detection circuits 102u, 102v, 102w detect the zero cross point. Switch between.
  • the switching circuits 140u, 140v, and 140w are examples of switching units.
  • the fully connected state is an example of the first connected state
  • the partially connected state is an example of the second connected state.
  • the power line 35u is connected to one end of the winding 24u.
  • the other end of the winding 24u and one end of the winding 25u are connected to each other, and a power line 241u extends from the midpoint between the winding 24u and the winding 25u.
  • Power line 241u branches into power lines 242u and 243w.
  • a power line 251u extends from the other end of the winding 25u.
  • Power line 251u branches into power lines 252u and 253w.
  • the power line 35v is connected to one end of the winding 24v.
  • the other end of the winding 24v and one end of the winding 25v are connected to each other, and a power line 241v extends from the midpoint between the winding 24v and the winding 25v.
  • Power line 241v branches into power lines 242v and 243u.
  • a power line 251v extends from the other end of the winding 25v.
  • Power line 251v branches into power lines 252v and 253u.
  • the power line 35w is connected to one end of the winding 24w.
  • the other end of the winding 24w and one end of the winding 25w are connected to each other, and a power line 241w extends from the midpoint between the winding 24w and the winding 25w.
  • Power line 241w branches into power lines 242w and 243v.
  • a power line 251w extends from the other end of the winding 25w.
  • Power line 251w branches into power lines 252w and 253v.
  • the switching circuit 140u includes semiconductor relays 141u and 142u.
  • Switching circuit 140v includes semiconductor relays 141v and 142v.
  • Switching circuit 140w includes semiconductor relays 141w and 142w.
  • Semiconductor relays 141u, 142u, 141v, 142v, 141w, 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.
  • a first terminal of semiconductor relay 142u is connected to power line 252u, and a second terminal is connected to 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 thereof will be omitted.
  • the power line 35u is drawn into the winding switching device 100.
  • a current sensor 131u is attached to the power line 35u.
  • Current sensor 131u detects the U-phase current flowing through power line 35u.
  • the current sensor 131u is, for example, an ACCT that detects only the AC component of 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 of the control circuit 103u is connected to the gate of the semiconductor relay 141u.
  • the output Q bar of RS flip-flop 120 is connected to the gate of semiconductor relay 142u. The same applies to the V phase and W phase.
  • the other configuration of the winding switching device 100A according to the second embodiment is the same as the configuration of the winding switching device 100 according to the first embodiment, so the same components are denoted by the same reference numerals and the description thereof will be given below. Omitted.
  • the control device 50 sets the value of the switching command signal to Low, and sets the value of the switching command signal to Low.
  • the value of the switching command signal is set to High.
  • connection state of the windings 21u, 22u, 21v, 22v, 21w, 22w can be switched between the fully connected state and the partially connected state at the timing of the zero cross point of the winding currents Iu, Iv, and Iw. .
  • FIG. 6 is a circuit diagram showing an example of the configuration of a winding switching device according to a third embodiment.
  • signal lines 331u, 331v, 331w extending from current sensors 33u, 33v, 33w arranged in a power converter 30 are connected to zero-cross detection circuits 102u, 102v, 102w. ing.
  • the winding switching device 100B includes correction circuits 150u, 150v, and 150w that remove DC components from the output signals of the current sensors 33u, 33v, and 33w.
  • the correction circuits 150u, 150v, and 150w are examples of correction sections.
  • the U-phase will be described as a representative configuration of the correction circuit 150u. Since the V phase and W phase are the same, their explanation will be omitted.
  • a signal line 331u extending from the power converter 30 is drawn into the inside of the winding switching device 100B. That is, the signal line 331u extending from the current sensor 33u is directly drawn into the winding switching device 100B without passing through a signal processing circuit or the like on the way.
  • the signal line 331u branches, and one signal line is connected to the first input terminal of the subtraction circuit 152u. The other signal line is connected to the input terminal of filter 151u.
  • a signal line extends from the output terminal of the filter 151u, and this signal line is connected to the second input terminal of the subtraction circuit 152u.
  • a signal line extends from the output terminal of the subtraction circuit 152u, and this signal line is connected to the zero-cross detection circuit 102u.
  • FIG. 7 is a circuit diagram showing an example of the configuration of the correction circuit.
  • Filter 151u is a low-pass filter including a resistor and a capacitor.
  • the filter 151u removes, from the voltage signal Vin output from the current sensor 33u, frequency components equal to or higher than a threshold lower than the frequencies of the winding currents Iu, Iv, and Iw at the time of switching the connection state of the windings of the motor 20. .
  • the filter 151u outputs a voltage Vfilt obtained by removing the above frequency component from the input voltage Vin.
  • the subtraction circuit 152u receives input of the voltage signal Vin from the current sensor 33u and the voltage signal Vfilt from the filter 151u, and outputs a differential voltage Vout between Vin and Vfilt.
  • FIG. 8A is a graph showing the waveforms of the voltage signal Vin from the current sensor 33u and the voltage signal Vfilt from the filter 151u.
  • the vertical axis shows voltage and the horizontal axis shows time.
  • the voltage signal Vin output from the current sensor 33u includes an AC component and a DC component corresponding to the U phase. Therefore, the voltage signal Vin shows a waveform in which an alternating current having the same frequency as the alternating current corresponding to the U phase is offset by the above-mentioned direct current component.
  • the AC waveform is offset by a DC component of 0.2V.
  • the filter 151u removes AC components from the voltage signal Vin. Therefore, the voltage signal output from the filter 151u is the above-mentioned DC component. That is, in the example of FIG. 8A, Vfilt is a DC voltage of 0.2V.
  • FIG. 8B is a graph showing the waveform of the voltage signal from the subtraction circuit 152u.
  • the subtraction circuit 152u subtracts Vfilt from the voltage signal Vin output from the current sensor 33u. Therefore, the voltage signal Vout output from the subtraction circuit 152u is a signal whose offset amount is corrected to 0 from Vin, that is, an AC voltage signal that does not include a DC component.
  • the zero-crossing detection circuit 102u can detect the zero-crossing point in the U-phase winding current Iu without being affected by the DC component included in the output voltage of the current sensor 33u. .
  • FIG. 9 is a circuit diagram showing a modified example of the configuration of the winding switching device according to the third embodiment.
  • the correction circuits are filters 153u, 153v, and 153w.
  • the filters 153u, 153v, and 153w are high-pass filters having a characteristic of passing only frequency components equal to or higher than a threshold lower than the frequency of the winding currents Iu, Iv, and Iw at the time of switching the connection state of the windings of the motor 20.
  • the DC component can be removed from the output signals of the current sensors 33u, 33v, and 33w.
  • FIG. 10 is a circuit diagram showing an example of the configuration of a winding switching device according to a fourth embodiment.
  • a winding switching device 100C according to the fourth embodiment includes current sensors 101U, 101V, and 101W.
  • the current sensor 101U is attached to, for example, a power line 35u drawn into the winding switching device 100C. However, the current sensor 101U may be attached to the power line 211u, 212u, or 222u instead of the power line 35u. Current sensor 101U detects the U-phase current flowing through power line 35u. Current sensors 101V and 101W are similarly attached to power lines 35v and 35w. Current sensors 101U, 101V, and 101W can detect current values of currents flowing through power lines 35u, 35v, and 35w, including DC components and AC components.
  • the current sensor 101U is, for example, a DCCT (direct current transformer) or a shunt resistor.
  • Signal lines 331U, 331V, 331W extending from current sensors 101U, 101V, 101W are connected to zero-cross detection circuits 102u, 102v, 102w.
  • the winding switching device 100C includes correction circuits 150u, 150v, and 150w that remove DC components from the output signals of the current sensors 101U, 101V, and 101W.
  • the correction circuits 150u, 150v, and 150w are the same as the correction circuits 150u, 150v, and 150w described in the second embodiment.
  • the control device 50 receives output signals from the current sensors 101U, 101V, and 101W.
  • current sensors 33u, 33v, and 33w provided in the power converter 30 are omitted.
  • the control device 50 performs feedback control of the motor 20 based on the current values detected by the current sensors 101U, 101V, and 101W. That is, the control device 50 determines the voltage values to be applied to the windings 21u, 22u, 21v, 22v, 21w, and 22w based on the current values of the U-phase, V-phase, and W-phase currents input to the motor 20.
  • the switches 31u, 32u, 31v, 32v, 31w, and 32w are turned on and off by PWM control according to the determined voltage value. That is, in this embodiment, current sensors 101U, 101V, and 101W are commonly used to control the power converter 30. This allows the number of current sensors in the entire winding switching system to be reduced.
  • 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 100 winding switching device 101u, 101v, 101w current sensor 102u, 102v, 102w zero cross detection circuit (detection section) 103u, 103v, 103w control circuit 104u, 104v, 104w switching circuit (switching section) 111u, 112u, 113u, 111v, 112v, 113v, 111w, 112w, 113w Semiconductor relay 212u, 221u, 222u, 212v, 221v, 222v, 212w, 221w, 222w Power line 131, 133 AND circuit 132 NOT circuit 120 Latch Circuit (RS flip flop) 121,123 NOT circuit 122

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  • Control Of Ac Motors In General (AREA)
PCT/JP2023/008040 2022-07-06 2023-03-03 巻線切替装置及び巻線切替システム Ceased WO2024009558A1 (ja)

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WO2025243817A1 (ja) * 2024-05-21 2025-11-27 株式会社オートネットワーク技術研究所 制御装置、巻線切替システム、制御方法、及び制御プログラム

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Publication number Priority date Publication date Assignee Title
JPH0947029A (ja) * 1995-08-02 1997-02-14 Aisin Aw Co Ltd デッドタイム補償装置、デッドタイム補償方法、モータ駆動装置及びモータ駆動方法
JPH1023765A (ja) * 1996-07-05 1998-01-23 Matsushita Refrig Co Ltd Ｐｗｍ方式電圧形インバータ
JP2019213257A (ja) * 2018-05-31 2019-12-12 株式会社デンソー 回転機の制御装置および制御方法
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
WO2020110315A1 (ja) * 2018-11-30 2020-06-04 三菱電機株式会社 モータ駆動装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0947029A (ja) * 1995-08-02 1997-02-14 Aisin Aw Co Ltd デッドタイム補償装置、デッドタイム補償方法、モータ駆動装置及びモータ駆動方法
JPH1023765A (ja) * 1996-07-05 1998-01-23 Matsushita Refrig Co Ltd Ｐｗｍ方式電圧形インバータ
JP2019213257A (ja) * 2018-05-31 2019-12-12 株式会社デンソー 回転機の制御装置および制御方法
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
WO2020110315A1 (ja) * 2018-11-30 2020-06-04 三菱電機株式会社 モータ駆動装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2025243817A1 (ja) * 2024-05-21 2025-11-27 株式会社オートネットワーク技術研究所 制御装置、巻線切替システム、制御方法、及び制御プログラム

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