目前常用的伺服电机是交流伺服电机，在电机的轴端装有光电编码器，通过检测转子角度用以变频控制。
Now commonly used servo motor is ac servo motor, the axial end in motor with photoelectric encoder, by examining the rotor Angle to frequency conversion control.
重点介绍了永磁交流伺服系统的控制策略，位置检测和辨识、主电路和驱动技术等关键技术。
This article introduced emphatically the control strategy, position detection and identification, drive technique as well as main circuit of permanent magnet Ac servo system.
伺服系统将检测信号和输入指令进行比较，将差值转化从而控制输出元件。
The servo systems compare the feedback signal with input instruction, then convert the difference into compensatory instruction so to control the output component.
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