Permanent magnet motor position-sensorless rotor position determining method and device

Abstract

The invention relates to a permanent magnet motor position-sensorless rotor position determining method and device. The method includes the following steps that: stator voltage, stator current, stator inductance and stator resistance are acquired; the flux linkage change rate of a permanent magnet motor is calculated according to the stator voltage, stator current, stator inductance and stator resistance; low-pass and high-pass filtering are performed on the flux linkage change rate, the flux linkage of the permanent magnet motor is obtained; and accurate flux linkage is obtained according to the flux linkage, a first preset parameter and a second preset parameter; and the rotor position angle of the permanent magnet motor is obtained according to the accurate flux linkage. According to the method and device, the low-pass and high-pass filtering link is adopted, so that errors caused by interference and direct-current components can be eliminated; the flux linkage is compensated through the first preset parameter and the second preset parameter, so that the problem of phase delay can be solved, and therefore, the obtained accurate flux linkage has high accuracy; and the accurate rotor position angle can be obtained according to the high-accuracy accurate flux linkage; and therefore, the accurate estimation of the rotor position angle can be realized, and the permanent magnet motor can be controlled precisely.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a method and device for determining the position of a permanent magnet motor without position sensing rotor. Background technique [0002] The permanent magnet motor is a motor that uses permanent magnets to provide a magnetic field. The motor needs two conditions to do work. One is the existence of a magnetic field, and the other is the existence of a moving current in the magnetic field. The magnetic field in a permanent magnet motor is made of permanent magnets, and the magnetic field is always Existence, need to provide current in the coil of the motor, the motor can work. When controlling the permanent magnet motor, it is necessary to detect the rotor position and current information. The rotor position directly affects the motor torque and inductance parameters. Therefore, the accurate determination of the rotor position is very important for the precise control o...

AI Technical Summary

Problems solved by technology

[0004] Based on this, it is necessary to solve the problem of large rotor position determination error, and provide a method and device for determining the rotor position of a permanent magnet motor without position sensing that reduces the rotor position estimation error

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