Research on PMSM Speed Control Strategy Based on Adaptive Sliding Mode Controller
In order to improve the speed regulation performance of PMSM,sliding mode control was grad-ually introduced into the control system instead of PI control.However,the development of sliding mode control was constrained due to the slow approaching speed and inherent chattering issues of the approach law in traditional sliding mode control.Therefore,an improved sliding mode approach law was proposed.Firstly,in order to solve the problem of difficult balance between approaching speed and chattering in tra-ditional constant velocity approaching laws,the system state variable was introduced in the proposed ap-proaching law,and an exponential term was introduced in the sliding mode gain to ensure the approac-hing speed while suppressing sliding mode chattering.Secondly,due to the discontinuous nature of the switching function near to zero,it could cause sliding mode chattering problem.Therefore,the conven-tional switching function was replaced by the sat function,achieving the goal of suppressing sliding mode chatter while ensuring response speed.Then,based on the proposed approach law,a sliding mode speed controller for permanent magnet synchronous motors was designed.Finally,simulation and experimental results indicated that the proposed approach law could improve the control performance of the permanent magnet synchronous motor speed control system.
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