椭圆活塞的数控车削对刀具伺服系统的频响和行程具有特殊的要求，介绍以自行研制的直流直线电机为驱动元件的刀具伺服系统。给出直线电机及闭环系统的传递函数，进行控制器的综合，根据活塞加工的特点．采用幅一相补偿控制。分析证明，该方法理论上可实现无差跟踪、正弦信号跟踪特性实验和实际活塞的试切结果表明，该方法应用简单，效果明显。 Elliptical Piston CNC Turning has special requirements on the frequency response and stroke of the servo system of the cutter. The servo system of the cutter with the direct current linear motor developed by itself is introduced. Given the transfer function of the linear motor and the closed-loop system, the controller synthesis, according to the characteristics of piston processing. Use amplitude and phase compensation control. The analysis proves that this method theoretically can achieve no-difference tracking, sinusoidal signal tracking characteristics experiment and practical piston test results show that the method is simple to apply and the effect is obvious.