起重机起升机构交流调速方案

The speed control of AC motor for crane's Iifting mechanism

交流电动机在起重机上得到了广泛的应用。文中对常用的交流调速方案,如转子串联电阻调速、电动液压推杆制动器调速、直流能耗制动低速下降调速、涡流制动器调速、变极调速、双电动机同轴运转调速及双电动机——行星联轴器等调速方案作了分析比较。

AC electric motor is widely used in cranes. This paper analyses and compares with each other some com-monly used AC motor speed control concepts, such as, speed control by means of resistors in series withrotor winding, by means of brakes with electro-hydraulic thruster, speed control with DC energy consump-tion braking for low descending speed, eddy current speed control, pole-changing speed control, speed controlby means of two motors, working with the same shaft or with a planetary coupling.