Reducing error in estimated angular position of a rotor of a motor

Patent metadata

Field	Value
Publication number	US-2023236004-A1
Application number	US-202218046808-A
Country	US
Kind code	A1
Filing date	Oct 14, 2022
Priority date	Jan 27, 2022
Publication date	Jul 27, 2023
Grant date	—

Abstract

One or more examples relate, generally, to reducing error in estimated angular position of a rotor of a motor.

First claim

What is claimed is:

1 . A method, comprising:
generating an error signal indicating error in estimated angular position of a rotor of a motor; and combining the error signal and an adjustment signal to generate a corrected error signal.

2 . The method of claim 1 , comprising:
determining an adjustment amount associated with motor winding current of a stator of the motor; and generating the adjustment signal corresponding to the determined adjustment amount.

3 . The method of claim 2 , wherein determining the adjustment amount associated with motor winding current of the stator of the motor comprises:
determining the adjustment amount associated with an estimated torque-producing component of motor winding current.

4 . The method of claim 3 , wherein determining the adjustment amount associated with the estimated torque-producing component of the motor winding current comprises:
calculating the adjustment amount at least partially based on a function representing a non-linear relationship between estimated torque-producing component and error in estimated angular position.

5 . The method of claim 3 , wherein determining the adjustment amount associated with the estimated torque-producing component of the motor winding current comprises:
calculating the adjustment amount at least partially based on the estimated torque-producing component and a predetermined constant representing a linear relationship between estimated torque-producing component and error in estimated angular position.

6 . The method of claim 2 , wherein the associated adjustment amount is predetermined to reduce effects of stator magnetic saliency on error in estimated angular position.

7 . The method of claim 2 , wherein the estimated torque-producing component of motor winding current includes: a q-axis component of a d/q representation of motor winding current.

8 . The method of claim 7 , wherein generating the error signal comprises:
demodulating, via an excitation signal exhibiting a waveform and frequency of an excitation voltage utilized to modulate motor current-control signals, the estimated q-axis component of the d/q representation of motor winding current to obtain a q-axis response signal; and low pass filtering the q-axis response signal to obtain the error signal to be corrected.

9 . The method of claim 8 , comprising:
multiplying the low-pass filtered q-axis response signal with a fixed gain value to obtain the error signal.

10 . An apparatus, comprising:
a phase detector to generate an error signal indicating error in estimated angular position of a rotor of a motor; and a summer to combine the error signal and an adjustment signal to generate a corrected error signal.

11 . The apparatus of claim 10 , comprising:
a signal adjuster to: receive an estimated torque-producing component of motor winding current; determine an adjustment amount associated with the estimated torque-producing component of motor winding current; and generate the adjustment signal corresponding to the determined adjustment amount.

12 . The apparatus of claim 11 , wherein the signal adjuster to determine the adjustment amount associated with the estimated torque-producing component of the motor winding current by:
calculating the adjustment amount at least partially based on a function representing a non-linear relationship between estimated torque-producing component and error in estimated angular position.

13 . The apparatus of claim 11 , wherein the signal adjuster to determine the adjustment amount associated with the estimated torque-producing component of the motor winding current by:
calculating the adjustment amount at least partially based on the estimated torque-producing component and a predetermined constant representing a linear relationship between estimated torque-producing component and error in estimated angular position.

14 . The apparatus of claim 11 , wherein the adjustment amount is one of multiple adjustment amounts respectively predetermined to reduce effects of stator magnetic saliency on error in estimated angular position.

15 . The apparatus of claim 11 , wherein the torque-producing component of motor winding current is a q-axis component of a d/q representation of motor winding current.

16 . The apparatus of claim 11 , wherein the phase detector comprising:
a demodulator to generate a q-axis response signal via demodulation of the estimated q-axis component of the d/q representation of motor winding current utilizing an excitation signal exhibiting a waveform and frequency of an excitation voltage utilized to modulate motor current-control signals; and a low pass filter to generate the error signal by low-pass filtering the q-axis response signal.

17 . The apparatus of claim 16 , comprising:
an amplifier to multiply the low-pass filtered q-axis response signal with a fixed gain value to generate the error signal.

Assignees

• Microchip Tech Inc

Inventors

• Sachs Jason M

Classifications

• G01B7/30 Primary

  for measuring angles or tapers; for testing the alignment of axes · CPC title

• H02P21/18

  Estimation of position or speed · CPC title

• H02P21/22

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

• H02P6/18 Primary

  without separate position detecting elements · CPC title