A method and a system for calculating the phase and the speed of a flux linkage of a motor based on a phase-locked loop

Abstract

The invention discloses a method and a system for calculating a phase and a speed of a motor flux linkage based on a phase locked loop, wherein the method comprises: obtaining a motor flux linkage ona two-phase stationary coordinate system of a motor through a motor model, and constructing a motor according to and The magnetic chain vector; constructing a unit rotation vector based on the phase locking angle; calculating the cross product of the unit rotation vector and the flux vector; calculating the phase-locked angular velocity of the motor for the PI operation; and integrating the phase-locked angular velocity to calculate the phase lock of the motor angle, in the operation process based on the phase-locked loop, the cross product has the phase difference information of the unit rotation vector and the flux vector, and by determining the phase difference, the flux linkage angle of the motor and the motor magnetic can be accurately calculated. The chain angular velocity, that is,the method and system for calculating the phase and velocity of the motor flux linkage based on the phase-locked loop, has the advantages of simple calculation, fast response, no need to calculate arctangent and differential, high calculation precision, small occupied memory, and no introduction High frequency interference.

Description

Technical field [0001] This application relates to the field of motor control technology, and in particular to a method and system for calculating the phase and speed of the motor flux based on a phase-locked loop. Background technique [0002] At present, three-phase AC asynchronous and permanent magnet synchronous motor speed sensorless vector control (SVC) has been widely used. How to quickly and accurately calculate the phase and speed of the motor flux is a key technical point for SVC control. [0003] The prior art generally uses the following methods to calculate the flux linkage phase and speed of three-phase AC asynchronous and permanent magnet synchronous motors: the first step is to calculate the motor flux summation on the two-phase stationary coordinate system through the motor model; the second step is through the arctangent function Calculate the flux linkage angle, that is; the third step is to calculate the flux linkage angular velocity by differentiating the flux ...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the above-mentioned problems in the prior art, the present invention provides a method and system for calculating the phase and speed of the motor flux linkage based on a phase-locked loop. In the process of chain phase and speed, the calculation amount is large, the calculation accuracy is not high, the memory is large, it is easy to introduce high-frequency interference, and the calculation response time is long.

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