Method and System for Detecting Logic Level of Rotor of Motor, and Motor

Patent metadata

Field	Value
Publication number	US-2021226564-A1
Application number	US-202117221629-A
Country	US
Kind code	A1
Filing date	Apr 2, 2021
Priority date	Oct 12, 2018
Publication date	Jul 22, 2021
Grant date	—

Abstract

A method and a system for detecting a logic level of a rotor of a motor, and a motor are disclosed. The method comprises: obtaining an analog voltage output by a position sensor for a winding of the motor; setting a first commutation voltage and a second commutation voltage; generating a logic level according to the analog voltage, the first commutation voltage and the second commutation voltage; and performing angle correction on the logic level according to a first angle corresponding to the first commutation voltage and a second angle corresponding to the second commutation voltage. The first commutation voltage is a commutation voltage for triggering a rising edge, and the second commutation voltage is a commutation voltage for triggering a falling edge. This method may accurately identify the logic level corresponding to the motor rotor, improve uniformity of a commutation voltage and prevent fluctuations in motor speed.

First claim

What is claimed is:

1 . A method for detecting a logic level of a rotor of a motor, comprising:
obtaining an analog voltage output by a position sensor for a winding of the motor; setting a first commutation voltage and a second commutation voltage; generating a logic level according to the analog voltage, the first commutation voltage and the second commutation voltage; and performing angle correction on the logic level according to a first angle corresponding to the first commutation voltage and a second angle corresponding to the second commutation voltage, wherein the first commutation voltage is a commutation voltage for triggering a rising edge, and the second commutation voltage is a commutation voltage for triggering a falling edge.

2 . The method for detecting a logic level of a rotor of a motor according to claim 1 , wherein the obtaining an analog voltage output by a position sensor for a winding of the motor comprises:
analog sampling voltage signals output by a Hall sensor as the analog voltage, wherein the position sensor is the Hall sensor.

3 . The method for detecting a logic level of a rotor of a motor according to claim 1 , wherein the generating a logic level according to the analog voltage, the first commutation voltage and the second commutation voltage comprises:
determining a rising edge of the logic level according to the first commutation voltage, wherein when the analog voltage is in a rising region, a logic level corresponding to a part of the analog voltage greater than the first commutation voltage is set to a high level, and a logic level corresponding to a part of the analog voltage less than the first commutation voltage is set to a low level.

4 . The method for detecting a logic level of a rotor of a motor according to claim 1 , wherein the generating a logic level according to the analog voltage, the first commutation voltage and the second commutation voltage comprises:
determining a falling edge of the logic level according to the second commutation voltage, wherein when the analog voltage is in a falling region, a logic level corresponding to a part of the analog voltage greater than the second commutation voltage is set to a high level, and a logic level corresponding to a part of the analog voltage less than the second commutation voltage is set to a low level.

5 . The method for detecting a logic level of a rotor of a motor according to claim 3 , wherein the generating a logic level according to the analog voltage, the first commutation voltage and the second commutation voltage further comprises:
determining a falling edge of the logic level according to the second commutation voltage, wherein when the analog voltage is in a falling region, a logic level corresponding to a part of the analog voltage greater than the second commutation voltage is set to a high level, and a logic level corresponding to a part of the analog voltage less than the second commutation voltage is set to a low level.

6 . The method for detecting a logic level of a rotor of a motor according to claim 1 , wherein the second commutation voltage is equal to a power supply voltage.

7 . The method for detecting a logic level of a rotor of a motor according to claim 1 , wherein the performing angle correction on the logic level according to a first angle corresponding to the first commutation voltage and a second angle corresponding to the second commutation voltage comprises:
setting an angle corresponding to a falling edge of the logic level to 0°; and advancing an angle corresponding to a rising edge of the logic level by 180°-X, wherein the X is the first angle corresponding to the first commutation voltage.

8 . The method for detecting a logic level of a rotor of a motor according to claim 1 , further comprising:
energizing the winding of the motor according to a corrected logic level.

9 . A system for detecting a logic level of a rotor of a motor, comprising:
a processor; and a memory for storing instructions executable by the processor; wherein the processor is configured to: obtain an analog voltage output by a position sensor for a winding of the motor; set a first commutation voltage and a second commutation voltage; generate a logic level according to the analog voltage, the first commutation voltage and the second commutation voltage; and perform angle correction on the logic level according to a first angle corresponding to the first commutation voltage and a second angle corresponding to the second commutation voltage, wherein the first commutation voltage is a commutation voltage for triggering a rising edge, and the second commutation voltage is a commutation voltage for triggering a falling edge.

10 . The system for detecting a logic level of a rotor of a motor according to claim 9 , wherein the processor is configured to: analog sample voltage signals output by a Hall sensor as the analog voltage,
wherein the position sensor is the Hall sensor.

11 . The system for detecting a logic level of a rotor of a motor according to claim 9 , wherein the processor is configured to:
determine a rising edge of the logic level according to the first commutation voltage, wherein when the analog voltage is in a rising region, a logic level corresponding to a part of the analog voltage greater than the first commutation voltage is set to a high level, and a logic level corresponding to a part of the analog voltage less than the first commutation voltage is set to a low level.

12 . The system for detecting a logic level of a rotor of a motor according to claim 9 , wherein the processor is configured to:
determine a falling edge of the logic level according to the second commutation voltage, wherein when the analog voltage is in a falling region, a logic level corresponding to a part of the analog voltage greater than the second commutation voltage is set to a high level, and a logic level corresponding to a part of the analog voltage less than the second commutation voltage is set to a low level.

13 . The system for detecting a logic level of a rotor of a motor according to claim 11 , wherein the processor is further configured to:
determine a falling edge of the logic level according to the second commutation voltage, wherein when the analog voltage is in a falling region, a logic level corresponding to a part of the analog voltage greater than the second commutation voltage is set to a high level, and a logic level corresponding to a part of the analog voltage less than the second commutation voltage is set to a low level.

14 . The system for detecting a logic level of a rotor of a motor according to claim 9 , wherein the second commutation voltage is equal to a power supply voltage.

15 . The system for detecting a logic level of a rotor of a motor according to claim 9 , wherein the processor is configured to:
set an angle corresponding to a falling edge of the logic level to 0°; and advance an angle corresponding to a rising edge of the logic level by 180°-X, wherein the X is the first angle corresponding to the first commutation voltage.

16 . The system for detecting a logic level of a rotor of a motor according to claim 9 , wherein the processor is further configured to: energize the winding of the motor according to a corrected logic level.

17 . A motor, comprising the system for detecting a logic level of a rotor of a motor according to claim 9 .

Assignees

• Gree Electric Appliances Inc Zhuhai

Inventors

• Ao Wenbin
• Chen Bin
• Xiao Shengyu
• Wu Wenxian
• Wang Yanzhang
• Zhang Xiaofei

Classifications

• H02P6/15

  Controlling commutation time · CPC title

• H02P6/16 Primary

  Circuit arrangements for detecting position · CPC title

• H02P6/17 Primary

  and for generating speed information · CPC title

• H02P6/10 Primary

  Arrangements for controlling torque ripple, e.g. providing reduced torque ripple · CPC title

• H02K29/08

  using magnetic effect devices, e.g. Hall-plates, magneto-resistors (H02K29/12 takes precedence) · CPC title