In order to handle heavy chattering and negative robustness caused by time-varying system parameters and external load\ndisturbance of the speed control system, thereby having high-precision control over surface permanent magnetic synchronous\nmachine (PMSM), this paper combines the advantages of sliding mode variable structure control (SMVSC) and fuzzy control.\nFirstly, a fuzzy sliding mode variable structure control (FUZZY-SMVSC) method is proposed, based on the vector control\nfoundation framework of surface PMSM (SPMSM). It effectively reduces chattering while keeping sliding mode, according to the\nfuzzy rules formulated based on fuzzy control principle. Secondly, integral sliding mode surface is used and integration element is\nintroduced into fuzzy control input, thereby reducing the static error of the conventional fuzzy control. Simulation and experimental\nresults show that the proposed fuzzy sliding mode variable structure control reduces chattering by fuzzy reasoning and softening.\nAlso, it still can maintain the strong robustness of sliding mode variable structure and ensures the fine dynamics of the system,\nagainst time-varying system parameters and external load disturbance.
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