A Correction Method for the Initial Position of Permanent Magnet Synchronous Motor Rotor

Abstract

The invention provides a method of correcting an initial position of a rotor of a permanent magnet synchronous motor. The rotor is shaken at high frequency through applying a current vector of a positive and negative pulse, the deviation size of the initial position of the rotor can be judged through the size of shaking degree, and a deviation value can be gradually reduced through changing a direction of the current vector. Through the action of the positive and negative pulse, the rotor is prevented from moving towards one direction at overlarge range or for overlong time, so that the movement of the rotor when the next current vector is acted cannot be affected, and the problem of mistakes in judgment is avoided. The amplitude of the current vector and the action time of the positive and negative pulse can be adjusted, the frequency and the amplitude of rotor vibration are enabled to be adjustable, and the flexibility and the disturbance rejection of a detection process are enhanced.

Description

Technical field [0001] The invention belongs to the field of motor control and relates to a method for correcting the initial position of a permanent magnet synchronous motor rotor. Background technique [0002] Due to the advantages of low power consumption, high efficiency, wide speed range, sturdiness and durability, and small torque ripple, permanent magnet synchronous motors are used in many application fields, especially high-performance applications, such as robots and high-precision CNC machine tools and servo motors. Taichung has been widely used. [0003] The permanent magnet synchronous motor adopts electronic commutation, so the deviation of the initial position of the rotor directly affects the output torque of the motor, and even causes the system to reverse and affect the stable operation of the system. [0004] In high-precision control occasions such as servo turntables, position sensors such as photoelectric encoders and resolvers are generally required to obtain t...

AI Technical Summary

Problems solved by technology

This type of method has the following problems: due to the existence of friction, especially static friction is often greater than sliding friction, which will cause the rotor to be unable to move if the electromagnetic torque generated by the applied current vector is too small, or the direction of rotation is not obvious. It is easily affected by external disturbance; if the generated electromagnetic torque is too large, the rotor will move too much and the movement time will be too long, which is unsafe in some occasions, and will also affect the rotor when the next current vector acts. direction of movement, resulting in misjudgment

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