一种实用交流电机保护电路

A Useful Protective Circuit of the AC Motor

本文通过实例介绍了一种自行设计的交流电机过流检测和断相保护电路,该电路具有灵敏度高,抗干扰能力强,阈 值连续可调的特点,且价格性能比好。适用于机床主轴过扭矩检测、电动卡盘夹紧等交流电机控制场合。

By illustrating the principles of the circuit and taking an actual example, the paper introduces a kind of useful circuit, which can identify the over current of the AC motor and protect the motor in the phase - failure circumstance .At the same time, it has the high sensitivity, powerful capacity of anti - interference, continuously variable control at broad range and excellent performance ratio. The circuit is very useful in measuring over-torque of the spindle of a lathe and cramp of electric chuck.