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锁相系统是一个能够跟踪输入信号频率和相位的闭环自动控制系统。为了获得较好的动特性和较高的稳态精度，在直流电动机销相系统中可采用数字模拟混合系统方案，即采用双环结构，外环是鉴频鉴相环，内环是速度环。实验证明，采用速度内环是高精度宽调速的可行方案。
Phase-locked system is a closed-loop automatic control system that can track the frequency and phase of the input signal. In order to obtain better dynamic characteristics and higher steady-state accuracy, the digital analog hybrid system can be used in the DC motor pin-phase system, that is, a double-ring structure is adopted. The outer ring is a phase-frequency detection phase-frequency ring and the inner ring is a speed loop. Experiments show that the speed of the inner ring is a feasible solution with high precision and wide speed control.