ANTI-DISTURBANCE ADAPTIVE CONTROL METHOD OF AC MOTOR SERVO ON THE BASIS OF DIGITAL PID ALGORITHM

To reduce the servo disturbance rejection adaptive control error of an alternating current motor and improve the control effect, this paper presents an alternating current motor servo disturbance rejection adaptive control method on the basis of a digital proportionalintegral-derivative (PID) control algorithm. Analyse the effect of the current and magnetic field of the alternating current motor, realise the motor position and speed control through the position feedback information of the encoder, obtain and construct the permanent magnet synchronous motor (PMSM) equation, establish the PMSM mathematical model, design the auto disturbance rejection controller (ADRC), realise the alternating current motor servo disturbance estimation and compensation according to the ADRC controller, and determine the disturbance control function of nonlinear factors according to the digital PID control algorithm, so as to realise the alternating current motor servo anti-disturbance adaptive control. The experimental results show that the motor speed tracking error of this method is only-0.05 rad/s and the anti-disturbance adaptive control time is only 0.26 s, which shows that the motor servo antidisturbance efficiency of this method is high. It can effectively track and control the motor speed, thereby achieving anti-interference and adaptive control of alternating current motor. Research has been conducted to optimise and improve the existing algorithm, greatly shortening the algorithm's operation time, improving algorithm performance, and verifying the superior performance of the digital PID control algorithm in the anti-interference direction of alternating current motor.