When the motor speed must, through the reduction gear drive cascading rotary potentiometers, the voltage difference is 0, motor to stop rotating.
当电机转速一定时，通过级联减速齿轮带动电位器旋转，使得电压差为0，电机停止转动。
When the motor speed must, through the reduction gear drive cascading rotary potentiometers, the voltage difference is 0, motor to stop rotating.
当电机转速一定时，通过级联减速齿轮带动电位器旋转，使得电压差为0，电机停止转动。
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