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Accurate, precise and rapid positioning is the basic concept of the servo, variable frequency is a necessary internal links, and there is also variable frequency in servo motor controller (to be variable speed). However, the current loop servo-loop speed or position control loop is closed to control, this is a big difference. In addition, construction of the servo motor and General Motors is different, it need to meet the requirement of fast response and accurate positioning. AC servos in circulation now mostly are permanent magnet synchronous servo motor, but the motor was limited by the process, it is highly difficult to make large power motor, the power more than a dozen KW synchronous servo’s price is expensive, so in the case of field application, AC induction servo usually will replace servo motor.