描述
伺服电机是一个典型闭环反馈系统，减速齿轮组由电机驱动，其终端（输出端）带动一个线性的比例电位器作位置检测，该电位器把转角坐标转换为一比例电压反馈给控制线路板，控制线路板将其与输入的控制脉冲信号比较，产生纠正脉冲，并驱动电机正向或反向地转动，使齿轮组
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