Motor controller, flux command generator, and method for generating flux command

Patent metadata

Field	Value
Publication number	US-2016373043-A1
Application number	US-201615176281-A
Country	US
Kind code	A1
Filing date	Jun 8, 2016
Priority date	Jun 18, 2015
Publication date	Dec 22, 2016
Grant date	—

Abstract

A motor controller includes a driver, a current detector, and a command generator. The driver is configured to drive a power converter based on a flux command on which an exploration signal is superimposed. The current detector is configured to detect an output current output from the power converter that has been driven by the driver. The command generator is configured to generate the flux command so as to reduce a current component, among current components included in the output current detected by the current detector, that corresponds to the exploration signal.

First claim

What is claimed as new and desired to be secured by Letters Patent of the United States is:

1 . A motor controller comprising:
a driver configured to drive a power converter based on a flux command on which an exploration signal is superimposed; a current detector configured to detect an output current output from the power converter that has been driven by the driver; and a command generator configured to generate the flux command so as to reduce a current component, among current components included in the output current detected by the current detector, that corresponds to the exploration signal.

2 . The motor controller according to claim 1 , wherein the command generator comprises
an extractor configured to extract the current component corresponding to the exploration signal, and a calculator configured to calculate the flux command so as to reduce the current component extracted by the extractor.

3 . The motor controller according to claim 2 , wherein the calculator is configured to calculate the flux command so as to make the current component extracted by the extractor zero.

4 . The motor controller according to claim 2 , wherein the calculator comprises
a base command generator configured to generate a base command that serves as a basis for the flux command, a correction amount generator configured to, based on the current component extracted by the extractor, generate a flux correction amount to reduce the current component extracted by the extractor, and a corrector configured to correct the base command based on the flux correction amount so as to generate the flux command.

5 . The motor controller according to claim 4 , wherein the base command generator is configured to perform lowpass filter processing with respect to an original command set in advance so as to generate the base command.

6 . The motor controller according to claim 4 , wherein the correction amount generator comprises an integrator configured to integrate the current component extracted by the extractor so as to generate the flux correction amount.

7 . The motor controller according to claim 4 , further comprising:
a torque command generator configured to generate a torque command; and a torque estimator configured to estimate an output torque output from the power converter, wherein the correction amount generator comprises an adjustor configured to adjust the flux correction amount based on a difference between the torque command and the torque estimated by the torque estimator.

8 . The motor controller according to claim 7 , wherein the adjustor is configured to adjust the flux correction amount based on a quotient of the difference, between the torque command and the torque estimated by the torque estimator, divided by an amplitude of the output current.

9 . A flux command generator comprising:
a current detector configured to detect an output current output from a power converter that is driven based on a flux command on which an exploration signal is superimposed; and a command generator configured to generate the flux command so as to reduce a current component, among current components included in the output current detected by the current detector, that corresponds to the exploration signal.

10 . A method for generating a flux command, the method comprising:
detecting an output current output from a power converter that is driven based on a flux command on which an exploration signal is superimposed; and generating the flux command so as to reduce a current component that is included in the output current and that corresponds to the exploration signal.

11 . The motor controller according to claim 3 , wherein the calculator comprises
a base command generator configured to generate a base command that serves as a basis for the flux command, a correction amount generator configured to, based on the current component extracted by the extractor, generate a flux correction amount to reduce the current component extracted by the extractor, and a corrector configured to correct the base command based on the flux correction amount so as to generate the flux command.

12 . The motor controller according to claim 11 , wherein the base command generator is configured to perform lowpass filter processing with respect to an original command set in advance so as to generate the base command.

13 . The motor controller according to claim 5 , wherein the correction amount generator comprises an integrator configured to integrate the current component extracted by the extractor so as to generate the flux correction amount.

14 . The motor controller according to claim 11 , wherein the correction amount generator comprises an integrator configured to integrate the current component extracted by the extractor so as to generate the flux correction amount.

15 . The motor controller according to claim 12 , wherein the correction amount generator comprises an integrator configured to integrate the current component extracted by the extractor so as to generate the flux correction amount.

16 . The motor controller according to claim 5 , further comprising:
a torque command generator configured to generate a torque command; and a torque estimator configured to estimate an output torque output from the power converter, wherein the correction amount generator comprises an adjustor configured to adjust the flux correction amount based on a difference between the torque command and the torque estimated by the torque estimator.

17 . The motor controller according to claim 6 , further comprising:
a torque command generator configured to generate a torque command; and a torque estimator configured to estimate an output torque output from the power converter, wherein the correction amount generator comprises an adjustor configured to adjust the flux correction amount based on a difference between the torque command and the torque estimated by the torque estimator.

18 . The motor controller according to claim 3 , further comprising:
a torque command generator configured to generate a torque command; and a torque estimator configured to estimate an output torque output from the power converter, wherein the correction amount generator comprises an adjustor configured to adjust the flux correction amount based on a difference between the torque command and the torque estimated by the torque estimator.

19 . The motor controller according to claim 11 , further comprising:
a torque command generator configured to generate a torque command; and a torque estimator configured to estimate an output torque output from the power converter, wherein the correction amount generator comprises an adjustor configured to adjust the flux correction amount based on a difference between the torque command and the torque estimated by the torque estimator.

20 . The motor controller according to claim 5 , further comprising:
a torque command generator configured to generate a torque command; and a torque estimator configured to estimate an output torque output from the power converter, wherein the correction amount generator comprises an adjustor configured to adjust the flux correction amount based on a difference between the torque command and the torque estimated by the torque estimator.

Assignees

• Yaskawa Electric Corp

Inventors

• Yamazaki Akira

Classifications

• H02P21/141 Primary

  Flux estimation · CPC title

• H02P21/00 Primary

  Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation · CPC title

• H02P21/20

  Estimation of torque · CPC title

• H02P21/22 Primary

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

• H02P27/08

  with pulse width modulation · CPC title