Several Noteworthy Problems in the Design of Low-voltage Motor Control Loop

Tang Ying（Engineering Company of Beijing General Research Institute of Mining & Metallurgy，

Beijing 100044，China）

Abstract Low-voltage motors are fairly widely used equipments in industrial enterprises，and the design of their control loops directly affects the normal operation of the equipments. Based on years of experience，several noteworthy problems in the design process of low-voltage motor control loop are summed up.

Key words　Low-voltage motor Control loop Contactor Thermal relay Frequency convertor

摘　要　低压电动机是工企中应用较多的电气设备，其控制回路的设计直接影响到设备的正常运行。根据多年的设计实践经验，总结出在低压电动机控制回路的设计中应注意的几个问题。

关键词　低压电动机 控制回路 接触器 热继电器 变频器