Sliding-mode variable structure control method of variable exponential coefficient reaching law of permanent magnet synchronous motor

Abstract

The invention discloses a sliding-mode variable structure control method of a variable exponential coefficient reaching law of a permanent magnet synchronous motor. The method comprises the following steps: aiming at the requirements of a control system of a high-performance permanent magnet synchronous motor, a variable exponential function term formula is introduced on the basis of a conventional exponential reaching law; the formula takes a first-order norm of systematic state variables as an exponent of exponential functions, adaptively adjusts the reaching speed of a variable exponent term and a variable speed term according to the distance between the system and a sliding-mode surface, and is helpful to increase the dynamic response speed of the system; the systematic state variables are associated by taking the first-order norm of the systematic state variables as the exponent of the functions; and an s function is introduced to replace a symbolic function for further suppressing system chattering. Therefore, the sliding-mode variable structure control method of the permanent magnet synchronous motor using the variable exponential coefficient reaching law is provided. Compared with an integral-type sliding-mode variable structure control method, the method disclosed by the invention can be used for effectively increasing the dynamic characteristics and steady state characteristics of the system as well as increasing the robustness of the system.

Description

technical field [0001] The invention belongs to the application field of motor stability control, and relates to a control method of a permanent magnet synchronous motor. Background technique [0002] The permanent magnet synchronous motor (Permanent Magnet Synchronous Motor, PMSM) has the advantages of simple structure, low loss, high power factor, and strong reliability, so it has a wide range of applications in many fields such as radar technology, electric vehicles, and aerospace. However, PMSM is a nonlinear, time-varying, and strongly coupled complex system. Motor parameter changes and external disturbances will greatly reduce the performance of traditional PI control. , anti-jamming ability and other requirements. [0003] Research results based on modern control theory, such as neural network control, fuzzy control, model reference adaptive control, sliding mode control, etc., have been gradually applied to AC servo systems to solve the problems caused by convention...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the disadvantages of poor dynamic performance and low robustness of the integral sliding mode variable structure control motor speed control system based on conventional reaching rate, a variable exponential sliding mode speed control method based on variable exponential coefficient reaching law is proposed.

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