速度继电器的工作原理及主要作用

Release time:2022-12-20
author:Ameya360
source:网络
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  速度继电器,转速继电器,又称反接制动继电器。它的主要结构是由转子、定子及触点三部分组成。速度继电器主要用于三相异步电动机反接制动的控制电路中,它的任务是当三相电源的相序改变以后,产生与实际转子转动方向相反的旋转磁场,从而产生制动力矩。因此,使电动机在制动状态下迅速降低速度。在电机转速接近零时立即发出信号,切断电源使之停车,否则电动机开始反方向起动。今天Ameya360电子元器件采购网将给大家介绍一下速度继电器小知识。

速度继电器的工作原理及主要作用

  一、速度继电器的工作原理

  它的转子是一个永久磁铁,与电动机或机械轴连接,随着电动机旋转而旋转。转子与鼠笼转子相似,内有短路条,它也能围绕着转轴转动。当转子随电动机转动时,它的磁场与定子短路条相切割,产生感应电势及感应电流,这与电动机的工作原理相同,故定子随着转子转动而转动起来。

  定子转动时带动杠杆,杠杆推动触点,使之闭合与分断。当电动机旋转方向改变时,继电器的转子与定子的转向也改变,这时定子就可以触动另外一组触点,使之分断与闭合。当电动机停止时,继电器的触点即恢复原来的静止状态。

  二、速度继电器的主要作用

  1、速度继电器主要用于三相异步电动机反接制动的控制电路中,它的任务是当三相电源的相序改变以后,产生与实际转子转动方向相反的旋转磁场,从而产生制动力矩。因此,使电动机在制动状态下迅速降低速度。在电机转速接近零时立即发出信号,切断电源使之停车(否则电动机开始反方向起动)。

  2、速度继电器应用广泛,可以用来监测船舶、火车的内燃机引擎,以及气体、水和风力涡轮机,还可以用于造纸业、箔的生产和纺织业生产上。在船用柴油机以及很多柴油发电机组的应用中,速度继电器作为一个二次安全回路,当紧急情况产生时,迅速关闭引擎。



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