PWM交流伺服系统是一个高阶非线性对象，本文把它简化处理为低阶变系数线性对象。

PWM AC servo motor is normally a nonlinear control object of high order. In this paper it is simplified as a linear object of low order with variable parameters.

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用权重方程产生的突变的高阶非线性预报方程，其y与X的相关系数比1阶线性方程提高5%左右。

The Y-X correlation coefficient of a high order non - linear equation through mutation was higher than that of a simple linear equation by about 5 percent.

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