The control device creates driving voltage output every time. One driving voltage has duration, called a pulse width.
控制仪每次输出一位的驱动电压，一个驱动电压持续时间，称为脉冲宽度。
A pulse width modulation (PWM) DC motor rotation speed control experiment system device is developed.
研制了直流电动机脉宽调制转速控制实验系统。
The control system drives the cutting trolley forward, and the longitudinal device cuts the leftover of the material, and the crosscut device cut it in needed width.
切割小车由控制系统带动缓缓行进，经过纵切装置将坯体的两侧余料切除并按设定宽度对坯体进行纵向切割。
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