一种简易的电机缺相保护器

Simple motor open-phase protector

Abstract

The utility model discloses a simple motor open-phase protector including a motor, a breaker, a three-phase switch, a first relay, a first button switch, a second button switch, a rectification circuit, a second relay, a diode, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, and a bulb. The second relay is provided with a group of normally closed contacts serially connected in an original contactor coil loop, after the second relay is picked up, the normally closed switch of the second relay is turned off, the first relay losses power, the motor stops working, thereby taking the effect of protection. The simple motor open-phase protector also has the protection function that the breaker breaks down when the line has a short circuit fault, and when the line is overloaded, an electrothermal relay starts to work because of larger current to enable the relays to loss power. The simple motor open-phase protector is suitable for small and medium motors, and is reliable in work, simple in strucutre, small in size, low in cost, as well as is in favor of popularization.
本实用新型公开了一种简易的电机缺相保护器,包括电机、断路器、三相开关、第一继电器、第一按钮开关、第二按钮开关、整流电路、第二继电器、二极管、第一电容、第二电容、第三电容、第四电容和灯泡。第二继电器有一组常闭触点串接在原来的接触器线圈回路中,第二继电器吸合后,其第二继电器的常闭开关断开,第一继电器失电,电机停止工作,起到了保护作用。本实用新型是一种较简单的电机缺相保护装置,同样具有在线路发生短路故障时,断路器可以跳断,过负荷时,较大的电流可以使热继电器动作,从而使继电器线圈失电,起到保护的功能。且适用于中小型电机,工作可靠、结构简单、体积小、成本低,有利于推广。

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    CN-105896472-AAugust 24, 2016黄焕珠一种三相交流电动机的缺相保护器