摘要
通常直流电机的正反转调速是通过继电器的转换或用两套控制线路来实现的，这种转换使得电机方向的改变不连续，特别是对往复运动系统很不实用，本文介绍一种新的控制电路，能很好地实现这个功能。
Generally, positive and negative speed regulation for direct current motors uses relay or two controlled circuits. The change of motor is uncontinuous. This paper presents a new controlled circuit, it can very well achieve stepless speed regulation.
关键词
直流电机
无级调速
控制电路
direct current motor
stepless speed regulation: controlled circuit
