Motor control device and electric power steering device

Patent metadata

Field	Value
Publication number	US-9397592-B2
Application number	US-201214351382-A
Country	US
Kind code	B2
Filing date	Jan 27, 2012
Priority date	Jan 27, 2012
Publication date	Jul 19, 2016
Grant date	Jul 19, 2016

Abstract

There is provided a motor control device for controlling a motor including plural sets of windings, which is configured so that, when a fault detection means detects a fault, inverters in the normal side other than in the fault side are continued to be controlled by normal-time current control means and further, inverters in the fault side are continued to be controlled by fault-time voltage commands generated by a fault-time current control means configured with a fault-time normal-side command generator and a fault-time fault-side command generator, so as to emphasis a torque ripple of the motor when a winding fault of the motor or an inverter fault occurs, to thereby cause a user to surely recognize the fault.

First claim

The invention claimed is:

1. A motor control device which controls a motor including plural sets of windings, comprising:
a plurality of inverters each having switching elements for respective phases of each of the plural sets of windings, which control voltages applied to the respective phases;
a current controller which controls currents caused to flow the plural sets of windings, by giving to each of the inverters, voltage commands corresponding to the voltages applied to the respective phases, according to a total required torque-current value that is equivalent to a target value of a torque to be generated by the motor; and
a fault detector which detects a short-circuit fault in the switching elements, or an earth short-circuit or voltage short-circuit fault in the inverters or the plural sets of windings;
wherein the current controller has a normal-time current controller which is used at normal time so as to control, respectively, the currents caused to flow the plural sets of windings, and a fault-time current controller which generates a fault-time voltage command according to a content of the fault detected by the fault detector;
wherein, when the fault detector detects the fault, the current controller continues controlling the inverter in the normal side by the normal-time current controller while continuing controlling the inverter in the fault side by the fault-time voltage command generated by the fault-time current controller, to thereby emphasis a torque ripple; and
wherein the fault-time current controller uses the phase without fault in the fault side and at least one of the respective phases in the normal side, to generate a torque calculated by adding, to a motor torque to be generated at normal time and in a phase range where a brake torque due to a fault phase is not generated, a reverse-direction torque against the direction of the brake torque.

2. The motor control device of claim 1 , wherein the fault-time current controller causes a total torque of an output torque in the normal side and an output torque in the fault side, to be nearly equal in time average to an output torque at normal time.

3. The motor control device of claim 1 , wherein the fault-time current controller generates the torque calculated by adding, over all of phase range where a brake torque due to a fault phase is not generated, the reverse-direction torque against the direction of the brake torque.

4. The motor control device of claim 1 , wherein the fault-time current controller generates the torque calculated by adding, in the phase range which is adjacent to a phase range where a brake torque is generated, the reverse-direction torque against the direction of the brake torque.

5. The motor control device of claim 1 , wherein the fault-time current controller generates the torque calculated by adding, in the phase range which is not adjacent to a phase range where a brake torque is generated, the reverse-direction torque against the direction of the brake torque.

6. The motor control device of claim 1 , wherein intended torques are added both in the normal side and the fault side.

7. An electric power steering device which uses the motor control device of claim 1 .

8. A motor control device which controls a motor including plural sets of windings, comprising:
a plurality of inverters each having switching elements for respective phases of each of the plural sets of windings, which control voltages applied to the respective phases;
a current controller which controls currents caused to flow the plural sets of windings, by giving to each of the inverters, voltage commands corresponding to the voltages applied to the respective phases, according to a total required torque-current value that is equivalent to a target value of a torque to be generated by the motor; and
a fault detector which detects a short-circuit fault in the switching elements, or an earth short-circuit or voltage short-circuit fault in the inverters or the plural sets of windings;
wherein the current controller has a normal-time current controller which is used at normal time so as to control, respectively, the currents caused to flow the plural sets of windings, and a fault-time current controller which generates a fault-time voltage command according to a content of the fault detected by the fault detector;
wherein, when the fault detector detects the fault, the current controller continues controlling the inverter in the normal side by the normal-time current controller while continuing controlling the inverter in the fault side by the fault-time voltage command generated by the fault-time current controller, to thereby emphasis a torque ripple; and
wherein the current controller adds in the fault side a reverse-direction torque against the direction of a brake torque, to set a total value of a torque to be generated in the normal side and a torque to be generated in the fault side so that the total value becomes larger as a rotation angle of the motor becomes closer to a rotation angle range where torque insufficiency emerges in the fault side.

9. A motor control device which controls a motor including plural sets of windings, comprising:
a plurality of inverters each having switching elements for respective phases of each of the plural sets of windings, which control voltages applied to the respective phases;
a current controller which controls currents caused to flow the plural sets of windings, by giving to each of the inverters, voltage commands corresponding to the voltages applied to the respective phases, according to a total required torque-current value that is equivalent to a target value of a torque to be generated by the motor; and
a fault detector which detects a short-circuit fault in the switching elements, or an earth short-circuit or voltage short-circuit fault in the inverters or the plural sets of windings;
wherein the current controller has a normal-time current controller which is used at normal time so as to control, respectively, the currents caused to flow the plural sets of windings, and a fault-time current controller which generates a fault-time voltage command according to a content of the fault detected by the fault detector;
wherein, when the fault detector detects the fault, the current controller continues controlling the inverter in the normal side by the normal-time current controller while continuing controlling the inverter in the fault side by the fault-time voltage command generated by the fault-time current controller, to thereby emphasis a torque ripple; and
wherein the fault-time current controller generates the torque in which a torque in the same direction of a brake torque has been subtracted in a phase range including a part or all of a phase range where the brake torque is generated.

10. An electric power steering device which uses the motor control device of claim 8 .

11. An electric power steering device which uses the motor control device of claim 9 .

Assignees

• Kezobo Isao
• Nakano Kosuke
• Asao Yoshihito
• Furukawa Akira
• Mitsubishi Electric Corp

Inventors

• Kezobo Isao
• Nakano Kosuke
• Asao Yoshihito
• Furukawa Akira

Classifications

• B60L2240/526

  Operating parameters · CPC title

• B60L2240/423

  Torque · CPC title

• B60L50/61

  by batteries charged by engine-driven generators, e.g. series hybrid electric vehicles · CPC title

• H02P25/22

  Multiple windings; Windings for more than three phases · CPC title

• B60L2240/421

  Speed · CPC title