Rotator Control Device, Rotator System, Vehicle, Electric Car and Electric Generation System

• US 20120146567A1
• Filed: 12/12/2011
• Published: 06/14/2012
• Est. Priority Date: 12/13/2010
• Status: Active Grant

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: IWAJI, Yoshitaka, Kaneko, Daigo, Kori, Daisuke, Masuda, Seikichi, Shinomiya, Takeshi, Mochizuki, Kento
• Granted Patent: US 8,760,095 B2
• Time in Patent Office: Days
• US Class Current: 318/504
• CPC Class Codes: H02P 29/02 Providing protection against overload without automatic interruption of supply protection against faults of stepper motors H02P8/36

Abstract

To prevent demagnetization of a permanent magnet synchronous rotating machine, a rotating machine control device according to the present invention is a rotating machine control device comprising: a power converter having a switch part on each of a positive side and a negative side for each phase; and short circuit detection unit for detecting a short circuit of the switch part, wherein a command to turn on positive-side switches and negative-side switches of a plurality of phases of the switch part is issued in the case where the short circuit detection unit detects the short circuit.

Claims

1. A rotating machine control device comprising:

a power converter having a switch part on each of a positive side and a negative side for each phase; and

a short circuit detection unit for detecting a short circuit of the switch part,

wherein a command to turn on positive-side switches and negative-side switches of a plurality of phases of the switch part is issued in the case where the short circuit detection unit detects the short circuit.

2. The rotating machine control device according to claim 1, comprising:

an overcurrent detection unit for detecting an overcurrent of a rotating machine; and

an abnormality detector to which a signal from the short circuit detection unit is input,

wherein the abnormality detector issues the command to turn on the positive-side switches and the negative-side switches of the plurality of phases of the switch part.

3. The rotating machine control device according to claim 2, wherein the abnormality detector issues the command to turn on the positive-side switches and the negative-side switches of the plurality of phases of the switch part, in the case where the signal from the short circuit detection unit is input to the abnormality detector or the overcurrent of the rotating machine is detected.

4. The rotating machine control device according to claim 3, wherein the abnormality detector includes:

an overcurrent level setter for determining an overcurrent threshold;

a comparator for comparing a phase current of the rotating machine with the overcurrent threshold and, in the case where the phase current is larger than the threshold, detecting the overcurrent of the rotating machine and outputting an abnormality signal; and

an OR circuit for outputting an abnormality signal in the case where the abnormality signal from the comparator or the signal from the short circuit detection unit is input to the OR circuit, and

wherein the abnormality detector issues the command to turn on the positive-side switches and the negative-side switches of the plurality of phases of the switch part in the case where the signal from the short circuit detection unit is input to the abnormality detector or the overcurrent of the rotating machine is detected, by the OR circuit outputting the abnormality signal.

5. The rotating machine control device according to claim 2, wherein the abnormality detector issues a command to turn off the positive-side switches and the negative-side switches of the plurality of phases of the switch part in the case where either the signal from the short circuit detection unit is input to the abnormality detector or the overcurrent of the rotating machine is detected, and issues the command to turn on the positive-side switches and the negative-side switches of the plurality of phases of the switch part in the case where the signal from the short circuit detection unit is input to the abnormality detector and also the overcurrent of the rotating machine is detected.

6. The rotating machine control device according to claim 5, wherein the abnormality detector includes:

an overcurrent level setter for determining an overcurrent threshold;

a comparator for comparing a phase current of the rotating machine with the overcurrent threshold and, in the case where the phase current is larger than the threshold, detecting the overcurrent of the rotating machine and outputting an abnormality signal;

an OR circuit for outputting an abnormality signal in the case where the abnormality signal from the comparator is input to the OR circuit;

an AND circuit for outputting an abnormality signal in the case where both the abnormality signal from the OR circuit and the signal from the short circuit detection unit are input to the AND circuit; and

an adder to which the signal from the AND circuit and the signal from the short circuit detection unit are input,

wherein the adder outputs a first abnormality signal in the case where either the signal from the short circuit detection unit is input to the adder or the overcurrent of the rotating machine is detected, and outputs a second abnormality signal in the case where the signal from the short circuit detection unit is input to the adder and also the overcurrent of the rotating machine is detected, and

wherein the abnormality detector issues the command to turn off the positive-side switches and the negative-side switches of the plurality of phases of the switch part in the case where the adder outputs the first abnormality signal, and issues the command to turn on the positive-side switches and the negative-side switches of the plurality of phases of the switch part in the case where the adder outputs the second abnormality signal.

7. The rotating machine control device according to claim 1, wherein the abnormality detector issues a command to turn on positive-side switches and negative-side switches of all three phases.

10. The rotating machine control device according to claim 2, wherein a short-circuiting switch is further provided in a wiring part connecting the power converter to the rotating machine, the short-circuiting switch being capable of short-circuiting all wires of the wiring part, and

wherein the short-circuiting switch short-circuits all of the wires in the case where the signal from the short circuit detection unit is input to the short-circuiting switch or the overcurrent of the rotating machine is detected.

11. A rotating machine system comprising:

a permanent magnet rotating machine including a rotor and a stator positioned in opposition to the rotor with a predetermined gap therebetween, with a permanent magnet being disposed in the rotor; and

the rotating machine control device according to claim 1.

12. The rotating machine system according to claim 11, comprising

a breaker between the rotating machine and the rotating machine control device,

wherein the command to turn on the positive-side switches and the negative-side switches of the plurality of phases of the switch part is issued before a breaking operation of the breaker is completed.

13. An electric vehicle or electric car that comprises the rotating machine system according to claim 11 and uses the rotating machine as a motor.

14. An electric generation system that comprises the rotating machine system according to claim 11 and uses the rotating machine as an electric generator.

8. A rotating machine control device comprising:

a power converter having a switch part on each of a positive side and a negative side for each phase;

an overcurrent detection unit for detecting an overcurrent of a rotating machine;

a short circuit detection unit for detecting a short circuit of the switch part; and

an abnormality detector to which a signal from the short circuit detection unit is input,

wherein the abnormality detector issues a command to turn off positive-side switches and negative-side switches of three phases of the switch part in the case where the signal from the short circuit detection unit is input to the abnormality detector and the overcurrent of the rotating machine is not detected, and issues a command to transmit a signal from an abnormal-time gate signal generator to the positive-side switches and the negative-side switches of the three phases of the switch part in the case where the signal from the short circuit detection unit is input to the abnormality detector and also the overcurrent of the rotating machine is detected, and

wherein the abnormal-time gate signal generator outputs a signal to turn off a positive-side switch and turn on a negative-side switch for each phase in which a phase current of the rotating machine at a time when the overcurrent of the rotating machine is detected is positive, and outputs a signal to turn on the positive-side switch and turn off the negative-side switch for each phase in which the phase current of the rotating machine at the time when the overcurrent of the rotating machine is detected is negative.

9. The rotating machine control device according to claim 8, wherein the abnormality detector includes:

an overcurrent level setter for determining an overcurrent threshold;

a comparator for comparing the phase current of the rotating machine with the overcurrent threshold and, in the case where the phase current is larger than the threshold, detecting the overcurrent of the rotating machine and outputting an abnormality signal;

an OR circuit for outputting an abnormality signal in the case where the abnormality signal from the comparator is input to the OR circuit;

an AND circuit for outputting an abnormality signal in the case where both the abnormality signal from the OR circuit and the signal from the short circuit detection unit are input to the AND circuit; and

an adder to which the signal from the AND circuit and the signal from the short circuit detection unit are input,

wherein the adder outputs a first abnormality signal in the case where either the signal from the short circuit detection unit is input to the adder or the overcurrent of the rotating machine is detected, and outputs a second abnormality signal in the case where the signal from the short circuit detection unit is input to the adder and also the overcurrent of the rotating machine is detected,

wherein the abnormality detector issues the command to turn off the positive-side switches and the negative-side switches of the three phases of the switch part in the case where the adder outputs the first abnormality signal, and issues the command to transmit the signal from the abnormal-time gate signal generator to the positive-side switches and the negative-side switches of the three phases of the switch part in the case where the adder outputs the second abnormality signal, and

wherein the abnormality signal from the OR circuit is input to the abnormal-time gate signal generator, and the abnormal-time gate signal generator holds a current of each phase of the rotating machine at a time when the abnormality signal from the OR circuit is input to the abnormal-time gate signal generator and then determines a polarity of the current, and outputs the signal to turn off the positive-side switch and turn on the negative-side switch for each phase in which the phase current is positive, and outputs the signal to turn on the positive-side switch and turn off the negative-side switch for each phase in which the phase current is negative.