Rotor initial position detection method, device and computer-readable storage medium

Abstract

The invention provides a rotor initial position detection method, equipment and computer-readable storage medium. The rotor initial position detection method includes: superimposing a high-frequency square wave voltage on the d-axis voltage output by the current regulator, and according to the inverter The initial value of the rotor position is obtained from the feedback value of the three-phase current output by the inverter; the first preset current and the second preset current are respectively applied to the current regulator of the inverter as the d-axis current command value, and according to the inverter The feedback value of the output three-phase current obtains the magnetic pole position adjustment amount, the first preset current is equal to the second preset current duration, the amplitude is equal, and the amplitude sign is opposite; the initial value of the rotor position is adjusted according to the magnetic pole position adjustment amount, and the obtained Rotor initial position. The present invention combines the high-frequency square wave injection method with the given positive and negative direct-axis current magnetic pole identification method, no band-pass filter is needed, and the amplitude of the injected voltage can be determined in advance. The above method also improves the current amplitude of the high-frequency response, Increased signal-to-noise ratio.

Description

technical field [0001] The present invention relates to the field of permanent magnet synchronous motors, and more specifically, relates to a rotor initial position detection method, equipment and computer-readable storage medium. Background technique [0002] In existing permanent magnet synchronous motors, the position of the rotor is usually detected by a position sensor. However, since the position sensor increases the cost, volume, noise and reliability of the system, a position sensorless control technology for permanent magnet synchronous motors has emerged. The position sensorless control technology of permanent magnet synchronous motor is mainly divided into medium and high speed back electromotive force method and low speed (zero speed) salient pole tracking method. Because the back electromotive force of the motor is zero at rest, it becomes a difficult point to obtain the initial position of the rotor. [0003] The existing permanent magnet synchronous motor ro...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is that in the existing method for detecting the initial position of the permanent magnet synchronous motor rotor, the sine wave high-frequency injection method degrades the system performance, and the single sine wave high-frequency injection cannot distinguish N and S poles. The positive and negative voltage pulse method has the problem that it is difficult to determine the amplitude of the injected voltage. Aiming at the above problems, a method, device and computer-readable storage medium for detecting the initial position of the rotor are provided.

Images