Sliding mode control based on adaptive dead-zone saturated function for PMLSM

Because of driving load directly and linear move, the servo performance of Permanent Magnet Linear Synchronous Motor (PMLSM) is influenced by gliding friction, dent force, load force and other external disturbances seriously. Sliding Mode Control (SMC) is insensitive to parameters variations and disturbances, simple in physics realization and quick in response, but the existing of chattering phenomenon limits its application in reality. Aiming at discrete variable structure system, a new sliding mode reaching law is proposed, in which the saturated function of the traditional reaching law is replaced by an adaptive dead-zone saturated function in order to effectively reduce chattering phenomenon. The simulation results verify that the control scheme has strong robustness to parameter variations and external disturbances, and restrains chattering effectively to ensure the quality of control system.