Detection of current measurement gain errors in synchronous motor drives

Patent metadata

Field	Value
Publication number	US-11283391-B2
Application number	US-201916698170-A
Country	US
Kind code	B2
Filing date	Nov 27, 2019
Priority date	Nov 27, 2019
Publication date	Mar 22, 2022
Grant date	Mar 22, 2022

Abstract

Systems and methods for detecting a current measurement gain error in a current measurement system is disclosed. The method includes reading an output voltage signal, extracting a signature of a current measurement gain error from the output voltage signal, detecting an existence of the current measurement gain error based on the signature, and responsive to detecting the existence of the current measurement gain error, identifying a diagnostic voltage phase in which the current measurement gain error exists.

First claim

What is claimed is:

1. A system for detecting a current measurement gain error in a current measurement system, the system comprising:
a processor; and
a memory that includes instructions that, when executed by the processor, cause the processor to:
read an output voltage signal;
utilize a mathematical model of a closed loop current control system wherein the mathematical model comprises a current measurement gain error which includes at least a signature of pulsating voltage signals at a frequency of two per electrical revolution;
perform, using the mathematical model, a mathematical transformation to demodulate the output voltage signal to extract the signature;
detect an existence of the current measurement gain error based on the signature; and
responsive to detecting the existence of the current measurement gain error, identify a motor phase in which the current measurement gain error exists.

2. The system of claim 1 , wherein, responsive to identifying the motor phase in which the current measurement gain error exists, the instructions further cause the processor to identify a current sensor that caused the current measurement gain error based on the motor phase.

3. The system of claim 2 , wherein the instructions further cause the processor to:
determine a mode of operation in which a synchronous motor drive is to operate based on information pertaining to the current sensor that caused the current measurement gain error; and
cause the synchronous motor drive to operate in the mode of operation.

4. The system of claim 3 , wherein the information comprises an inaccurate estimation of shunt resistance, operational amplifier gain, or some combination thereof.

5. The system of claim 3 , wherein the mode of operation is a current mode of operation.

6. The system of claim 3 , wherein the mode of operation is a voltage mode of operation.

7. The system of claim 1 , wherein to detect the existence of the current measurement gain error based on the signature, the instructions further cause the processor to determine a diagnostic voltage magnitude of the output voltage signal satisfies a threshold.

8. A method for detecting a current measurement gain error in a current measurement system, the method comprising:
reading an output voltage signal;
utilizing a mathematical model of a closed loop current control system wherein the mathematical model comprises a current measurement gain error which includes at least a signature of pulsating voltage signals at a frequency of two per electrical revolution;
performing, using the mathematical model, a mathematical transformation to demodulate the output voltage signal to extract the signature;
detecting an existence of the current measurement gain error based on the signature; and
responsive to detecting the existence of the current measurement gain error, identifying a motor phase in which the current measurement gain error exists.

9. The method of claim 8 , the method further comprising, responsive to identifying the motor phase in which the current measurement gain error exists, identifying a current sensor that caused the current measurement gain error based on the motor phase.

10. The method of claim 9 , further comprising:
determining a mode of operation in which a synchronous motor drive is to operate based on information pertaining to the current sensor that caused the current measurement gain error; and
causing the synchronous motor drive to operate in the mode of operation.

11. The method of claim 10 , wherein the information comprises an inaccurate estimation of shunt resistance, operational amplifier gain, or some combination thereof.

12. The method of claim 10 , wherein the mode of operation is a current mode of operation.

13. The method of claim 10 , wherein the mode of operation is a voltage mode of operation.

14. The method of claim 8 , wherein detecting the existence of the current measurement gain error based on the signature further comprises determining a diagnostic voltage magnitude of the output voltage signal satisfies a threshold.

15. An electronic device comprising:
a processor; and
a memory that includes instructions that, when executed by the processor, cause the processor to:
read an output voltage signal;
utilize a mathematical model of a closed loop current control system wherein the mathematical model comprises a current measurement gain error which includes at least a signature of pulsating voltage signals at a frequency of two per electrical revolution;
perform, using the mathematical model, a mathematical transformation to demodulate the output voltage signal to extract the signature;
detect an existence of the current measurement gain error based on the signature; and
responsive to detecting the existence of the current measurement gain error, identify a motor phase in which the current measurement gain error exists.

16. The electronic device of claim 15 , wherein, responsive to identifying the motor phase in which the current measurement gain error exists, the instructions further cause the processor to identify a current sensor that caused the current measurement gain error based on the motor phase.

17. The electronic device of claim 16 , wherein the instructions further cause the processor to:
determine a mode of operation in which a synchronous motor drive is to operate based on information pertaining to the current sensor that caused the current measurement gain error; and
cause the synchronous motor drive to operate in the mode of operation.

18. The electronic device of claim 17 , wherein the information comprises an inaccurate estimation of shunt resistance, operational amplifier gain, or some combination thereof.

19. The electronic device of claim 17 , wherein the mode of operation is a current mode of operation.

20. The electronic device of claim 17 , wherein the mode of operation is a voltage mode of operation.

Assignees

• Steering Solutions Ip Holding

Inventors

• Pramod Prerit
• Govindu Varsha
• Namburi Krishna Mpk

Classifications

• H02P6/183 Primary

  using an injected high frequency signal · CPC title

• H02P2207/05

  Synchronous machines, e.g. with permanent magnets or DC excitation · CPC title

• H02P6/28

  Arrangements for controlling current (H02P6/10 takes precedence) · CPC title

• H02P29/027 Primary

  the fault being an over-current · CPC title

• H02P29/024

  Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load · CPC title