Step motor control, by pulse by changing the order of electricity can change the motor rotation direction, change the pulse frequency can change the motor rotation speed.
步进电机受脉冲的控制，通过改变通电的顺序可改变电机的旋转方向，改变脉冲的频率可改变电机的旋转速度。
Based on this method, the accurate control pulses are generated from the PC timer and used for driving the step motor to realize a wide range speed control smoothly.
基于该方案，通过截用PC机系统的定时器资源产生精确定时的控制脉冲，使步进电机实现宽广范围内的速度平滑控制。
This system employed infrared sensors to detect liquid drops and used step motor with other parts to control the liquid speed.
系统采用红外传感器检测液滴速度，用步进电机及其配套装置来控制液滴速度。
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