Research On Sliding Mode Variable Structure Based Control Method For Permanent Magnet Synchronous Motor

Owing to its high efficiency, simple structure and many otheradvantages, alternating current (AC) servo system with permanentmagnet synchronous motors (PMSM) is widely used in industrialapplications such as printing press, packaging machinery, railtransportation. However, the negative factors such as multiple coupledstates, parameter perturbation and external disturbance have greatlyaffected the control performance of a AC servo system. So the improvedperformance is desired for the AC servo system with PMSM.To guarantee the robustness against perturbation and externaldisturbance of a PMSM system, a systematic and deep investigation isdone in this paper on the variable structure sliding mode based controlmethod and chattering reduction. In this research, the permanent magnetis object, the sliding mode variable structure control theory has beenused for the designed of control method, and the experimental platformis build based on the digital signal processor. The main research work isas follows:The algorithm adopted in the servo system and the existingproblems are summarized in this paper. Conclusion can be obtained thatsliding mode control based method can effectively improve theperformance of the servo system of permanent magnet synchronousmotor and the disturbance observer based method is a efficient way ofreducing chattering of sliding mode control.The sliding mode control method based on perturbation bounds isproposed to resolve the problem that the conventional servo systemcontrol algorithms are difficult to meet the requirements of the controlsystem. The performance of servo control system and robustness todisturbances are improved by the control algorithm based on slidingmode control.The cascade sliding mode disturbance observer is designed toreduce the chattering of sliding mode controller. The integrated sliding mode control algorithm is made up by the sliding mode disturbanceobserver with the principle of equivalence, the chattering phenomenoncan be effectively weakened by this algorithm.The real time implementation of sliding mode controller forpermanent magnet synchronous motor has been designed based on thedigital signal processor. The experimental results show that the proposedmethod is stable and effective.