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本文针对位置伺服系统中存在的跟踪误差，研究了零相位跟踪控制的交流位置伺服系统，提出了一种简便易行的设计零相位跟踪控制器的方法—扩展频带零相位跟踪控制。仿真和实验结果表明，采用零相位跟踪控制器来减小位置伺服系统的跟踪误差是十分有效的。
In this paper, aiming at the tracking error existing in the position servo system, the AC position servo system with zero phase tracking control is studied. A simple and easy method to design the zero phase tracking controller is proposed. The simulation and experimental results show that it is very effective to reduce the tracking error of the position servo system by zero-phase tracking controller.