摘要：目前大多采用饱和函数来削弱永磁同步电机滑模变结构控制的抖振，并且饱和函数的边界层厚度越大削弱抖振的能力越强，但这样会降低电机控制的最终精度。为了解决在采用饱和函数时，削弱抖振和提高控制精度之间的矛盾，提出了非线性滑模面。把非线性滑模面和饱和函数结合起来，既能很好地削弱抖振又能提高控制的精度，最后通过分析仿真证明了这点。

关键词：非线性滑模面；变结构控制；PMSM；饱和函数
Abstract: Saturation function is widely used to weaken the chattering of sliding mode variable structure control in the permanent magnet synchronous machine control. And the larger boundary layer width of saturation function, the stronger weakens the chattering. However, this will reduce the final accuracy of the motor control when the boundary layer width is large. For solving that contradiction, the nonlinear sliding surface was proposed. Combining saturation function and nonlinear sliding surface, a new method to weaken chattering was created. Adopting this method can effectively reduce chattering and improve control accuracy. Finally the simulation proved that. 

Key words: nonlinear sliding surface；variable structure control；PMSM；saturation function