Control apparatus for AC rotary machine and control apparatus for electric power steering

Patent metadata

Field	Value
Publication number	US-9780712-B2
Application number	US-201415110270-A
Country	US
Kind code	B2
Filing date	Feb 21, 2014
Priority date	Feb 21, 2014
Publication date	Oct 3, 2017
Grant date	Oct 3, 2017

Abstract

This invention is concerning a control apparatus for an AC rotary machine including: an AC rotary machine that includes a first winding and a second winding which have a phase difference; a first current detection unit that detects a current of the first winding; a second current detection unit that detects a current of the second winding; a control unit that calculates a first voltage command and a second voltage command on the basis of a detected current value; and a first detectability determination unit that determines a detectability of the current of the first winding, detected by the first current detection unit, on the basis of at least one of the voltage commands , wherein the control unit calculates the first voltage command and the second voltage command on the basis of the detected current value of the second winding when the current of the first winding is undetectable.

First claim

The invention claimed is:

1. A control apparatus for an AC rotary machine, characterized by comprising:
an AC rotary machine that includes a first winding and a second winding which have a phase difference;
a first current detection unit that detects a current of the first winding;
a second current detection unit that detects a current of the second winding;
a control unit that calculates a first voltage command and a second voltage command on the basis of a detected current value of the AC rotary machine;
a first voltage application unit that applies a voltage to the first winding on the basis of the first voltage command;
a second voltage application unit that applies a voltage to the second winding on the basis of the second voltage command; and
a first detectability determination unit that determines a detectability of the current of the first winding, detected by the first current detection unit, on the basis of at least one of the first voltage command and the second voltage command,
wherein the control unit calculates the first voltage command on the basis of the current of the first winding, detected by the first current detection unit, when the first detectability determination unit determines that the current of the first winding is detectable, and calculates the first voltage command and the second voltage command on the basis of the current of the second winding, detected by the second current detection unit, when the first detectability determination unit determines that the current of the first winding is undetectable.

2. A control apparatus for an AC rotary machine, characterized by comprising:
an AC rotary machine that includes a first winding and a second winding;
a first current detection unit that detects a current of the first winding;
a second current detection unit that detects a current of the second winding;
a control unit that calculates a first voltage command and a second voltage command which have a phase difference on the basis of a detected current value of the AC rotary machine;
a first voltage application unit that applies a voltage to the first winding on the basis of the first voltage command;
a second voltage application unit that applies a voltage to the second winding on the basis of the second voltage command; and
a first detectability determination unit that determines a detectability of the current of the first winding, detected by the first current detection unit, on the basis of at least one of the first voltage command and the second voltage command,
wherein the control unit calculates the first voltage command on the basis of the current of the first winding, detected by the first current detection unit, when the first detectability determination unit determines that the current of the first winding is detectable, and calculates the first voltage command and the second voltage command on the basis of the current of the second winding, detected by the second current detection unit, when the first detectability determination unit determines that the current of the first winding is undetectable.

3. The control apparatus for an AC rotary machine according to claim 1 , wherein when a three-phase voltage constituting the first voltage command is set in descending order as a first maximum phase voltage, a first intermediate phase voltage, and a first minimum phase voltage, the first detectability determination unit determines whether or not the current of the first winding can be can be detected on the basis of a magnitude of the first intermediate phase voltage.

4. The control apparatus for an AC rotary machine according to claim 3 , wherein when the first intermediate phase voltage exceeds a first predetermined value, the first detectability determination unit determines that the current of the first winding is undetectable.

5. The control apparatus for an AC rotary machine according to claim 3 , wherein when the first intermediate phase voltage is lower than a second predetermined value, the first detectability determination unit determines that the current of the first winding is undetectable.

6. The control apparatus for an AC rotary machine according to claim 3 , wherein when at least one of a difference between the first maximum phase voltage and the first intermediate phase voltage and a difference between the first intermediate phase voltage and the first minimum phase voltage is lower than a third predetermined value, the first detectability determination unit determines that the current of the first winding is undetectable.

7. The control apparatus for an AC rotary machine according to claim 1 , wherein the first detectability determination unit determines whether or not the current of the first winding can be detected by the first current detection unit in accordance with a voltage phase angle of the first voltage command or a voltage phase angle of the second voltage command.

8. The control apparatus for an AC rotary machine according to claim 1 , characterized by further comprising a second detectability determination unit that determines a detectability of the current of the second winding, detected by the second current detection unit, on the basis of at least one of the first voltage command and the second voltage command,
wherein, when the current of the first winding is determined to be detectable by the first detectability determination unit, the control unit calculates the first voltage command and the second voltage command on the basis of the current of the first winding, detected by the first current detection unit, in a case where the second detectability determination unit determines that the current of the second winding is undetectable, and
calculates the first voltage command on the basis of the current of the first winding, detected by the first current detection unit, and calculates the second voltage command on the basis of the current of the second winding, detected by the second current detection unit, in a case where the second detectability determination unit determines that the current of the second winding is detectable.

9. The control apparatus for an AC rotary machine according to claim 8 , wherein when a three-phase voltage constituting the second voltage command is set in descending order as a second maximum phase voltage, a second intermediate phase voltage, and a second minimum phase voltage, the second detectability determination unit determines whether or not the current of the second winding can be detected on the basis of a magnitude of the second intermediate phase voltage.

10. The control apparatus for an AC rotary machine according to claim 9 , wherein when the second intermediate phase voltage exceeds a first predetermined value, the second detectability determination unit determines that the current of the second winding is undetectable.

11. The control apparatus for an AC rotary machine according to claim 9 , wherein when the second intermediate phase voltage is lower than the second predetermined value, the second detectability determination unit determines that the current of the second winding is undetectable.

12. The control apparatus for an AC rotary machine according to claim 9 , wherein when at least one of a difference between the second maximum phase voltage and the second intermediate phase voltage and a difference between the second intermediate phase voltage and the second minimum phase voltage is lower than a third predetermined value, the second detectability determination unit determines that the current of the second winding is undetectable.

13. The control apparatus for an AC rotary machine according to claim 9 , wherein the second detectabilit

Assignees

• Mitsubishi Electric Corp

Inventors

• Mori Tatsuya
• Kezobo Isao
• Kimpara Yoshihiko
• Furukawa Akira

Classifications

• B62D5/0463

  calculating assisting torque from the motor based on driver input · CPC title

• H02P21/22 Primary

  Current control, e.g. using a current control loop · CPC title

• H02P27/08

  with pulse width modulation · CPC title

• H02P25/22

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

• B62D5/046

  Controlling the motor · CPC title