请重写这段话：舵机内部有一个基准电路产生周期20ms宽度15ms的基准信号有一个比较器将外加信号与基准信号相比较判断出方向和大小从而产生电机的转动信号。
The servo motor contains a reference circuit that generates a baseline signal with a period of 20ms and a width of 1.5ms. A comparator is used to compare the incoming signal with the reference signal, determining the direction and magnitude, and generating a signal to rotate the motor.
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