Adaptive Continuous Sliding Mode Control Method for Permanent Magnet Synchronous Motor Based on Torque Observation

Abstract

The invention discloses a permanent magnet synchronous motor self-adaptive continuous sliding mode control method based on load torque observation, comprising: establishing a permanent magnet synchronous motor mathematical model; using a high-order fast terminal sliding mode load torque observer to estimate permanent magnet synchronous The load torque of the motor system is used for feed-forward compensation of the speed controller of the permanent magnet synchronous motor; the design of the adaptive continuous fast terminal sliding mode permanent magnet synchronous motor drive controller obtains the q-axis reference current under the system disturbance; the maximum torque ratio is used The strategy calculates the q-axis reference current; obtains the dq-axis control voltage through the current controller, and finally drives the permanent magnet synchronous motor to rotate through the drive module. The control method of the present invention combines a high-order fast terminal sliding mode load torque observer and an adaptive continuous fast terminal sliding mode controller, which can not only effectively control the speed of the permanent magnet synchronous motor, but also effectively weaken the chattering caused by the sliding mode and improve the Speed ​​control accuracy and dynamic performance.

Description

technical field [0001] The invention belongs to the field of drive control of permanent magnet synchronous motors, in particular to an adaptive continuous sliding mode control method for permanent magnet synchronous motors based on load torque observation. Background technique [0002] With the advent of high energy permanent magnet materials, permanent magnet motors are becoming more and more attractive. Due to continuous advances in motor topology and control strategies, permanent magnet synchronous motors have been identified as one of the most promising motors for powering modern electric and hybrid vehicles, however, permanent magnet synchronous motor systems are typically nonlinear, strongly coupled , multivariate, high-order and unstable systems. In addition to these nonlinear factors, the operation process of permanent magnet synchronous motor system is always accompanied by the influence of load torque variation and parameter uncertainty, so a powerful robust contr...

AI Technical Summary

Problems solved by technology

Due to the discontinuity of the control law, the chattering phenomenon is caused by the sliding mode term, and the sliding mode surface and control law design of the method make the dynamic performance of the control system limited.

Images