Research On Sliding Mode Adaptive Control Of Ac Parmanent Magnet Synchronous Motor Servo System

AC permanent magnet synchronous motor has the advantage of high power factor,low-speed running performance and cost-effective. Permanent magnet synchronousmotors develop rapidly and will soon be used in various industries. The permanentmagnet synchronous motor is a complex nonlinear controlled object, it is difficult toachieve desired control objectives in traditional control method. How to improvecontrol precision of AC permanent magnet synchronous motor is a primary task inmodern AC servo control system research.This paper introduces mathematical model of AC permanent magnet synchronousmotor and analyzes basic principle and implementation of vector control methods.Based on this theory, aim at uncertainty parameter of AC permanent magnetsynchronous motor servo control system, external disturbances and low model accuracy,sliding mode variable structure control thought is adopted in system. In order to weakenor eliminate the chattering in sliding mode control system, sliding mode adaptivecontrol strategy is proposed in this paper. This paper introduces design methodology ofsliding adaptive control and selection methods of adaptive law. Adaptive law isemployed to estimate parameters online, discontinuous projection operator is utilized tocorrect adaptive law, the effectiveness of control method is validated by MATLAB/Simulink platform. Then, hardware circuit of control system is set up with STM32ascontrol center, and execution program of system software is designed, its core programsare: main program design, external interrupt program design, abort protect programdesign. Finally, software debugging is implemented on hardware platform, experimentalresults show that control algorithm is feasible in AC servo system. In this paper, slidingadaptive control method is applied to an AC permanent magnet synchronous servomotor control system, the advantages of sliding mode control are low accuracy ofcontrol system model, insensitive to external disturbances and system parameterschange, fast response, and so on. Combined with adaptive control, parameters are adjusted online,"chattering" phenomenon can be weakened largely.The simulation results can be seen that, sliding mode adaptive control is adoptedin the motor, when started, overshoot of speed and current is small, and it can be quicklyreached to a steady state; When interference is added to the system, there are tinyfluctuations in speed and current, but it can be quickly restored to a stable operatingstate, its performance is obviously better than conventional PI control. The experimentalresults also validate that control strategy is feasible.