电工基础—电动机过热保护器原理及使用方法

电动机过热保护器也称热继电器,是我们经常使用的电动机保护元件之一,今天我们来学习一下,有关过热保护器的相关知识。 如下图是常用过热保护器的组成结构图,主要有双金属元件和触头部分组成…

电动机过热保护器也称热继电器,是我们经常使用的电动机保护元件之一,今天我们来学习一下,有关过热保护器的相关知识。

如下图是常用过热保护器的组成结构图,主要有双金属元件和触头部分组成,当电动机长时间负荷电流过大时,会引起双金属片发生弯曲移动,通过推杆,使触头与静触头断开,从而切断电动机的控制回路,达到保护电动机目的。

大多数的过热保护器都具有电流整定功能,可以调节过热保护器的脱扣等级,也就是调节图中12和7的位置,实现温度补偿片的受力大小,受力大,自然需要双金属片的形变量大,也就是需要的过热电流大,由此实现电流整定的功能。

电工基础—电动机过热保护器原理及使用方法接线方法

电工基础—电动机过热保护器原理及使用方法

应用举例:带过热保护的三相电动机接线电工基础—电动机过热保护器原理及使用方法

解疑答惑:有人会问,为什么我的电动机烧毁了,热保护器都没有断开呢?

电动机烧毁,热保护器都没有断开原因有一线几点:

1、接线错误,导致热保护器不动作

2、整定值过大,没有达到热保护器脱扣等级

3、从原理我们知道,热保护器之所以能起到保护作用,是因为受热导致双金属片弯曲,所以有一个能量累积过程,如果电机接地或短时间过流烧毁是不保护的

4、质量太差或者电网电压质量差

最后一个原因那就是你的点背了。。。O(∩_∩)O哈哈~

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电工基础—电动机过热保护器原理及使用方法

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