Initial rotor position detection device and method based on permanent-magnet synchronous motor

Patent metadata

Field	Value
Publication number	US-10511246-B2
Application number	US-201816137041-A
Country	US
Kind code	B2
Filing date	Sep 20, 2018
Priority date	Jul 25, 2017
Publication date	Dec 17, 2019
Grant date	Dec 17, 2019

Abstract

An initial rotor position detection device based on a permanent-magnet synchronous motor, including a host computer, a real-time simulation system, and a control system, where the real-time simulation system is connected to the control system, for determining an encoder pulse signal according to the model parameter of the permanent-magnet synchronous motor, the model parameter of the inverter, and a PWM pulse wave generated by the control system; and the control system is connected to the real-time simulation system, for using a binary search algorithm to determine an initial rotor angle of the permanent-magnet synchronous motor according to the encoder pulse signal sent by the real-time simulation system. A comprehensive closed-loop test circuit can be achieved by setting a host computer, a real-time simulation system, and a control system, and a used binary search algorithm can effectively and quickly detect an initial rotor position of a permanent-magnet synchronous motor.

First claim

We claim:

1. An initial rotor position detection device based on a permanent-magnet synchronous motor, where the detection device comprises: a host computer, a real-time simulation system, and a control system, wherein
the host computer is connected to the real-time simulation system, for sending a model parameter of a configured permanent-magnet synchronous motor and a model parameter of an inverter to the real-time simulation system;
the real-time simulation system is connected to the control system, for determining an encoder pulse signal according to the model parameter of the permanent-magnet synchronous motor, the model parameter of the inverter, and a PWM pulse wave generated by the control system;
the control system is connected to the real-time simulation system, for determining a PWM pulse wave according to the encoder pulse signal sent by the real-time simulation system, and using a binary search algorithm to determine an initial rotor angle of the permanent-magnet synchronous motor according to the encoder pulse signal sent by the real-time simulation system; and
the host computer is connected to the control system, for receiving and displaying the initial rotor angle of the permanent-magnet synchronous motor sent by the control system.

2. The initial rotor position detection device based on a permanent-magnet synchronous motor according to claim 1 , wherein the real-time simulation system comprises:
a pulse counting circuit, connected to the control system, for determining a duty ratio according to the PWM pulse wave generated by the control system;
a first processor, respectively connected to the host computer and the pulse counting circuit, for establishing a permanent-magnet synchronous motor model according to the model parameter of the permanent-magnet synchronous motor sent by the host computer, and establishing an inverter model according to the model parameter of the inverter sent by the host computer, the inverter model being connected to the permanent-magnet synchronous motor model, and further for controlling the inverter model according to the duty ratio sent by the pulse counting circuit, to enable the permanent-magnet synchronous motor model to generate jitter, and determining an angular position jitter signal; and
an encoder circuit, respectively connected to the first processor and the control system, for determining the encoder pulse signal according to the angular position jitter signal sent by the first processor, and send the encoder pulse signal to the control system.

3. The initial rotor position detection device based on a permanent-magnet synchronous motor according to claim 2 , wherein the real-time simulation system further comprises:
a first data acquisition circuit, respectively connected to the control system, the pulse counting circuit, and the encoder circuit, configured to acquire the PWM pulse wave generated by the control system, and send the PWM pulse wave to the pulse counting circuit, and configured to collect the encoder pulse signal generated by the encoder circuit and transmit the encoder pulse signal to the control system.

4. An initial rotor position detection method based on a permanent-magnet synchronous motor, wherein the method is applied to the initial rotor position detection device based on a permanent-magnet synchronous motor according to claim 3 , and the method comprises:
obtaining a model parameter of a permanent-magnet synchronous motor and a model parameter of an inverter;
establishing a permanent-magnet synchronous motor model according to the model parameter of the permanent-magnet synchronous motor, and establishing an inverter model according to the model parameter of the inverter;
obtaining a PWM pulse wave;
determining a duty ratio according to the PWM pulse wave;
controlling the inverter model according to the duty ratio, to enable the permanent-magnet synchronous motor model to generate jitter, and obtaining an angular position jitter signal;
determining the encoder pulse signal according to the angular position jitter signal; and
using a binary search algorithm to determine the initial rotor angle of the permanent-magnet synchronous motor according to the encoder pulse signal.

5. The initial rotor position detection method based on a permanent-magnet synchronous motor according to claim 4 , wherein the obtaining a PWM pulse wave specifically comprises:
obtaining the encoder pulse signal;
using the binary search algorithm to determine a PWM pulse signal according to the encoder pulse signal; and
determining the PWM pulse wave according to the PWM pulse signal.

6. The initial rotor position detection method based on a permanent-magnet synchronous motor according to claim 4 , wherein the using a binary search algorithm to determine the initial rotor angle of the permanent-magnet synchronous motor according to the encoder pulse signal specifically comprises:
calculating a progressively increased current vector magnitude according to the encoder pulse signal; and
using a binary search algorithm to determine the initial rotor angle of the permanent-magnet synchronous motor according to the progressively increased current vector magnitude and the encoder pulse signal.

7. An initial rotor position detection method based on a permanent-magnet synchronous motor, wherein the method is applied to the initial rotor position detection device based on a permanent-magnet synchronous motor according to claim 2 , and the method comprises:
obtaining a model parameter of a permanent-magnet synchronous motor and a model parameter of an inverter;
establishing a permanent-magnet synchronous motor model according to the model parameter of the permanent-magnet synchronous motor, and establishing an inverter model according to the model parameter of the inverter;
obtaining a PWM pulse wave;
determining a duty ratio according to the PWM pulse wave;
controlling the inverter model according to the duty ratio, to enable the permanent-magnet synchronous motor model to generate jitter, and obtaining an angular position jitter signal;
determining the encoder pulse signal according to the angular position jitter signal; and
using a binary search algorithm to determine the initial rotor angle of the permanent-magnet synchronous motor according to the encoder pulse signal.

8. The initial rotor position detection method based on a permanent-magnet synchronous motor according to claim 7 , wherein the obtaining a PWM pulse wave specifically comprises:
obtaining the encoder pulse signal;
using the binary search algorithm to determine a PWM pulse signal according to the encoder pulse signal; and
determining the PWM pulse wave according to the PWM pulse signal.

9. The initial rotor position detection method based on a permanent-magnet synchronous motor according to claim 7 , wherein the using a binary search algorithm to determine the initial rotor angle of the permanent-magnet synchronous motor according to the encoder pulse signal specifically comprises:
calculating a progressively increased current vector magnitude according to the encoder pulse signal; and
using a binary search algorithm to determine the initial rotor angle of the permanent-magnet synchronous motor according to the progressively increased current vector magnitude and the encoder pulse signal.

10. The initial rotor position detection device based on a permanent-magnet synchronous motor according to claim 1 , wherein the control system comprises:
a second processor, respectively connected to the host computer and the real-time simulation system, for determining a PWM pulse wave according to the encoder pulse signal sent by the real-time simulation system, and using the bina

Assignees

• Univ Wenzhou

Inventors

• Dai Yuxing
• Ruan Xiukai
• Cai Qibo
• Wu Kelu

Classifications

• H02P21/32 Primary

  Determining the initial rotor position (H02P21/34 takes precedence) · CPC title

• H02P21/22

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

• H02P21/34

  Arrangements for starting · CPC title

• H02P6/34

  Modelling or simulation for control purposes · CPC title

• H02P6/20

  Arrangements for starting (H02P6/08 takes precedence) · CPC title