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JP-2026075805-A - Control device for rotating electric machines

JP2026075805AJP 2026075805 AJP2026075805 AJP 2026075805AJP-2026075805-A

Abstract

[Problem] To obtain a control device for a rotating electric machine that can prevent the generation of a gate command signal that attempts to perform synchronous rectification during an abnormal period, even when the diode on-timing or diode off-timing cannot be detected correctly. [Solution] The control device 100 includes a synchronous rectification permission signal generation unit that generates synchronous rectification permission signals Swp and Swn based on the conduction state of the diodes; a switching signal generation unit 54 that generates switching signals Qp and Qn by setting the ON interval of the switching element within the range of the synchronous rectification permission intervals Tp and Tn indicated by the corresponding synchronous rectification permission signals Swp and Swn; an assumed permission interval setting unit that sets assumed permission intervals Tp* and Tn* of the synchronous rectification permission signals Swp and Swn based on the operating state of the rotating electric machine 1; and an abnormality determination unit 56 that determines whether or not there is an abnormality by comparing the synchronous rectification permission intervals Tp and Tn with the assumed permission intervals Tp* and Tn*. [Selection Diagram] Figure 7

Inventors

  • 水田 光星
  • 古川 晃

Assignees

  • 三菱電機モビリティ株式会社

Dates

Publication Date
20260511
Application Date
20241023

Claims (17)

  1. A control device for a rotating electric machine having a predetermined number of phases of armature windings, A power conversion unit is connected between the DC power supply and the armature winding, and has a series connection of high-potential switching elements and low-potential switching elements corresponding to each phase of the armature winding, and diodes connected in antiparallel to each of the switching elements. A synchronous rectification enable signal generation unit generates a synchronous rectification enable signal for each of the switching elements based on the conduction state of each of the diodes, A switching signal generation unit generates a switching signal to switch the switching element on and off by setting the ON interval of the switching element within the range of the synchronous rectification permission interval indicated by the corresponding synchronous rectification permission signal for each of the switching elements, and outputs the generated switching signal to the switching element. An abnormality determination criterion setting unit sets an abnormality determination criterion for the synchronous rectification permission signal based on the operating state of the rotating electric machine, A control device for a rotating electric machine, comprising: an abnormality determination unit that performs an abnormality determination by comparing the synchronous rectification permission signal with the abnormality determination criterion, and outputs an abnormality determination result indicating the presence or absence of an abnormality to the switching signal generation unit.
  2. The abnormality determination criterion setting unit sets the assumed permitted section, which is the assumed section of the synchronous rectification permitted section, as the abnormality determination criterion based on the operating state of the rotating electric machine. The abnormality determination unit makes the abnormality determination by comparing the synchronous rectification permitted section with the assumed permitted section, The control device for a rotating electric machine according to claim 1, wherein the assumed permitted interval is set based at least on the rotational speed of the rotating electric machine.
  3. The control device for a rotating electric machine according to claim 2, wherein the assumed permitted interval is set based at least on the rotational speed of the rotating electric machine and the DC voltage of the DC power supply.
  4. The system further includes a converter that converts the DC voltage supplied from the DC power source into power, and applies the converted DC voltage to the field winding provided in the rotating electric machine. The control device for a rotating electric machine according to claim 2, wherein the assumed permitted section is set based at least on the rotational speed of the rotating electric machine and the current value of the field current flowing through the field winding.
  5. The control device for a rotating electric machine according to any one of claims 2 to 4, wherein the assumed permission interval is the assumed permission time, which is the time when the synchronous rectification permission signal is assumed to be turned on, or the assumed permission angle, which is the rotational position of the rotating electric machine during the assumed permission time.
  6. The system further comprises a storage unit for storing the synchronous rectification permission section and a latest permission section acquisition unit for acquiring the latest permission section, wherein the latest permission section acquisition unit acquires the synchronous rectification permission section of the synchronous rectification permission signal that was turned off the latest time at the time of acquisition of the latest permission section as the latest permission section. The abnormality determination criterion setting unit sets a second assumed permitted section by widening the width of the latest permitted section by the assumed maximum increase, according to the period from the off timing of the synchronous rectification permitted signal of the latest permitted section to the time of the abnormality determination, and sets the second assumed permitted section as the abnormality determination criterion. The control device for a rotating electric machine according to claim 1, wherein the abnormality determination unit determines whether the synchronous rectification permitted section is narrower than the second assumed permitted section.
  7. The abnormality determination criterion setting unit sets a first assumed permitted section by narrowing the width of the latest permitted section by the assumed maximum reduction amount, according to the period from the off timing of the synchronous rectification permitted signal of the latest permitted section to the time of the abnormality determination, and sets the first assumed permitted section and the second assumed permitted section as the abnormality determination criteria. The control device for a rotating electric machine according to claim 6, wherein the abnormality determination unit determines whether the synchronous rectification permitted section is within the range between the first assumed permitted section and the second assumed permitted section.
  8. The control device for a rotating electric machine according to claim 6 or 7, wherein the assumed maximum increase is set based on the fluctuation range of the rotational acceleration of the rotating electric machine.
  9. The control device for a rotating electric machine according to claim 7, wherein the assumed maximum decrease is set based on the fluctuation range of the rotational acceleration of the rotating electric machine.
  10. The control device for a rotating electric machine according to claim 6 or 7, wherein the abnormality determination criterion setting unit corrects the latest permitted section in accordance with fluctuations in the operating state of the rotating electric machine from the time the latest permitted section is acquired until the abnormality determination is performed, and sets the abnormality determination criterion based on the corrected latest permitted section.
  11. The control device for a rotating electric machine according to claim 6 or 7, wherein the latest permitted section acquisition unit acquires the latest permitted section as the synchronous rectification permitted section of the synchronous rectification permitted signal that was turned off the latest time in a phase one phase ahead of the phase to which the synchronous rectification permitted section targeted for determination by the abnormality determination unit belongs.
  12. The control device for a rotating electric machine according to claim 6 or 7, wherein the latest permitted interval of the high-potential switching element is the synchronous rectification permitted interval of the low-potential switching element that is in phase with the high-potential switching element, half a cycle earlier in electrical angle.
  13. The control device for a rotating electric machine according to claim 6 or 7, wherein the latest permitted interval of the low-potential switching element is the synchronous rectification permitted interval of the high-potential switching element that is in phase with the low-potential switching element, half a cycle earlier in electrical angle.
  14. The abnormality determination criterion setting unit sets the assumed sequence of the ON timing of each of the synchronous rectification permission signals from the rotation direction of the rotating electric machine as the abnormality determination criterion. The control device for a rotating electric machine according to claim 1, wherein the abnormality determination unit determines whether or not there is an abnormality by comparing the order of the ON timings of each of the synchronous rectification permission signals with the assumed order.
  15. The abnormality determination criterion setting unit sets the assumed order of the off-timing of each of the synchronous rectification permission signals from the rotation direction of the rotating electric machine as the abnormality determination criterion. The control device for a rotating electric machine according to claim 1, wherein the abnormality determination unit determines whether or not there is an abnormality by comparing the order of the off-timing of each of the synchronous rectification permission signals with the assumed order.
  16. The control device for a rotating electric machine according to any one of claims 1 to 4, 6, 7, 14, or 15, wherein the switching signal generation unit sets all of the switching elements to OFF when the abnormality determination result indicates the occurrence of an abnormality.
  17. The control device for a rotating electric machine according to any one of claims 1 to 4, 6, 7, 14, or 15, wherein the rotating electric machine is a vehicle-mounted generator-motor that transmits the driving force generated by rotation to the vehicle's wheels, and also transmits the torque from the rotation of the wheels to rotate and generate electricity.

Description

This disclosure relates to a control device for a rotating electric machine. A known control method for rotating electric machines operating as motors or generators is synchronous rectification. In synchronous rectification, AC power is converted to DC power by controlling the on/off state of switching elements in synchronization with the waveform of AC power input from the rotating electric machine to a bridge circuit of switching elements. A specific implementation method of synchronous rectification involves generating gate command signals for each switching element based on the on-timing and off-timing of diodes connected in parallel to each switching element, thereby controlling the on/off state of each switching element. (See, for example, Patent Document 1). Japanese Patent Publication No. 2008-228450 This is a schematic diagram showing the control device for a rotating electric machine in Embodiment 1.This figure shows the voltage vector according to Embodiment 1.This is a schematic diagram showing a converter according to Embodiment 1.This is a schematic diagram showing the first inverter according to Embodiment 1.This figure shows an example of the current path when all switching elements of the first inverter according to Embodiment 1 are turned off.This is a schematic diagram showing the second inverter according to Embodiment 1.This is a schematic block diagram showing the control unit according to Embodiment 1.This figure illustrates the method for generating a field switching signal according to Embodiment 1.This is a block diagram showing a switching signal generation unit according to Embodiment 1.This is a block diagram showing the assumed permitted section setting unit according to Embodiment 1.This is a block diagram showing the abnormality detection unit according to Embodiment 1.This diagram illustrates the relationship between the conduction state of a diode and the induced voltage.This diagram shows the relationship between the assumed permitted section, the synchronous rectification permitted section, and the synchronous rectification section according to Embodiment 1, and illustrates the case where there are no abnormalities.This diagram shows the relationship between the assumed permitted section, the synchronous rectification permitted section, and the synchronous rectification section according to Embodiment 1, and illustrates the case where an abnormality occurs.This figure shows an example of the hardware configuration of the control unit according to Embodiment 1.This is a schematic diagram showing an example where the rotating electric machine according to Embodiment 1 is used as a vehicle-mounted generator/motor.This is a schematic block diagram showing the control unit according to Embodiment 2.This is a block diagram showing the assumed permitted section setting unit according to Embodiment 2.This figure shows the synchronous rectification enable signals for each switching element.This is a schematic block diagram showing the control unit according to Embodiment 3.This is a block diagram showing the abnormality determination unit according to Embodiment 3.This diagram shows the expected rising edge sequence of the synchronous rectification enable signal when the rotation direction of a rotating electric machine is forward.This diagram shows the expected rising edge sequence of the synchronous rectification enable signal when the rotation direction of a rotating electric machine is reversed.This diagram shows the rising edge sequence of the synchronous rectification enable signal, specifically the rising edge sequence in the event of an anomaly. Embodiment 1. Embodiment 1 will be described below with reference to Figures 1 to 16. In each figure, the same or equivalent members and parts will be denoted by the same reference numerals. Figure 1 is a schematic configuration diagram showing the control device for the rotating electric machine in Embodiment 1. The control device 100, that is, the control device for the rotating electric machine, controls the dual three-phase rotating electric machine 1. The control device 100 includes a converter 3, a first inverter 4A, and a second inverter 4B connected in parallel to each other between the DC power supply 2 and the rotating electric machine 1, and a control unit 5 that controls the converter 3, the first inverter 4A, and the second inverter 4B. As will be described in detail later, the control unit 5 generates field switching signals Qlp, Qrp, Qln, and Qrn based on a control command C input from a higher-level control device (not shown), a DC voltage Vdc input from the DC power supply 2, and a field current value if fed back from the converter 3, and outputs them to the converter 3. The control unit 5 also acquires synchronous rectification permission signals Swp11, Swp12, Swp13, Swn11, Swn12, and Swn13 from the synchronous rectification permission signal generation unit of the first inverter 4A, and acquires data related to t