Abstract: Sliding mode variable structure control with nonlinear switch function is applied into the control field of grinding wheel dynamic balancing.A kind of new method of improving dynamics performance of direct current motor speed control system is brought forward in this paper.This method is based on variable structure control theory.It not only solves the problem between the fast dynamic response and no overshoot，but also shortens the regulation time effectively by using of nonlinear switch function.

Key words: dynamic balance, grinding wheel, variable structure control with sliding mode, nonlinearity switching function

摘要： 将具有非线性切换函数的滑模变结构控制方法引入到砂轮动平衡控制领域。提出了一种改善直流电动机速度控制系统动态性能的新方法，该方法基于变结构控制理论，通过引入非线性切换函数，解决了快速的动态响应和禁止超调间的矛盾要求，有效地缩短了调节时间。

关键词: 动平衡, 砂轮, 滑模变结构控制, 非线性切换函数