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    This study proposes a novel model-free intelligent proportional-integral supertwisting nonlinear fractional-order sliding mode control strategy for permanent magnet synchronous motor speed regulation system. First of all, a model independent intelligent proportional-integral control strategy is adopted for the motor speed regulation system. Next, a novel model-free supertwisting nonlinear fractional-order sliding mode control strategy is constructed based on the ultralocal model of PMSM. Meanwhi…Read more