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一、锁相伺服系统简介锁柏环路（Phase－Lcokedloop）早在30年代就应用于无线电接收技术上，目前已在现代电子技术，通讯和空间技术等领域得到了广泛的应用。把锁相技术引入电气领域，用来准确地控制电动机转速，大约在60年代末和70年代初。首先是A．M．Moors提出用锁相环原理
Phase Locked Servo System Introduction Locked Loop (Phase-Lcokedloop) as early as 30 years on the radio receiver technology, has been in the modern electronic technology, communications and space technology and other fields has been widely used. The phase-locked technology into the electrical field, used to accurately control the motor speed, about the late 60s and early 70s. First is A. M. Moors proposed the principle of phase-locked loop