Adopting ac servo motor as the driving device, can the dc servo motor and a high precision, high performance as the half closedloop or closed loop controlsystem.
采用交流伺服电机作为驱动器件，可以和直流伺服电机一样构成高精度，高性能的半闭环或闭环控制系统。
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A kind of the pulse control mode, the drive and motor closedloop, but not to the numerical controlsystem, the feedback device, in a sense, can open loop control called the servo control.
For digitized AC servosystem, it needs software to support it's closed-loopcontrol. Its control quality is decided by the program of control computation directly.