Permanent magnet synchronous motor control method

Abstract

The invention discloses a permanent magnet synchronous motor control method in which a vector control system is used. The vector control system comprises an outer speed ring and an inner current ring, and a PI (proportional-integral) controller of a rotating speed ring is replaced with a two-DOF (degree of freedom) higher-order nonsingular terminal sliding mode controller; the input of the two-DOF higher-order nonsingular terminal sliding mode controller is the difference between the given rotating speed w* of a motor and the actual feedback rotating speed w* of the motor; the error between the given rotating speed and the feedback rotating speed is judged, when the error of the rotating speed is less than Xi, an output exciting current iq* is calculated by a simple higher-order nonsingular terminal sliding mode controller; when the error of the rotating speed is greater than Xi, the output of the two-DOF higher-order nonsingular terminal sliding mode controller is an output iq* controlled by a higher-order nonsingular terminal sliding mode and the sum of the output and compensation gain of the higher-order nonsingular terminal sliding mode; and the size of Xi can be set according to actual situations and needs. According to the method, the system control accuracy is improved and the rapid convergence of the rotating speed of the motor is realized; and the method has strong robustness on load disturbances.

Description

technical field [0001] The invention relates to a control method of a permanent magnet synchronous motor. Background technique [0002] Permanent Magnet Synchronous Motor (Permanent Magnet Synchronous Motor abbreviated as PMSM) has the advantages of low inertia, fast response, high power density, low loss, and high efficiency. And with the substantial improvement of the performance of permanent magnet materials, its application in the field of industrial production automation will become more and more extensive. However, since the permanent magnet synchronous motor is a high-order, nonlinear, strongly coupled multivariable system, and there are uncertainties such as parameter perturbation and load disturbance, it is difficult to control it with high performance. At present, many control methods for PMSM have been proposed, such as adaptive control, fuzzy control, neural network, active disturbance rejection control and so on. But these are rarely used in actual engineering...

AI Technical Summary

Problems solved by technology

The observer is used to observe the load disturbance and compensate it. This method can reduce the chattering by reducing the nonlinear term, but the complexity of the system design is increased due to the increase of the observer, and the system chattering has an influence Observation accuracy, it is difficult to achieve the ideal improvement effect in practice

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