本文目录一览:
- 1、交流接触器有什么作用
- 2、交流接触器的作用是什么?
- 3、交流接触器的用途是什么?
交流接触器有什么作用
交流接触器在电路中起接通或断开电源开关的作用,其工作原理与交流继电器相似,只是电磁开关的数量结构和使用场合及安装方式有所不同。交流接触器常用于负载额定电流大于10A,启动电流为60A以上的电器回路。在中央空调电气系统中使用的交流接触器,其控制线圈额定工作电压一般为220V,在线圈电流回路采用与继电器触点对其进行连接的方式进行连接,通过触点的接通或断开,从而控制回路电源的通断,达到控制大功率电器负载的目的。
交流接触器的作用是什么?
交流接触器是电力拖动和自动控制系统中应用最普遍的一种低压控制电器。作为执行元件,用于接通、分断线路、或频繁的控制电动机等设备运行。由动、静主触头,灭弧罩,动、静铁芯,辅助触头和支架外壳等组成。
电磁线圈通电后,使动铁芯在电磁力作用下吸合,直接或通过杠杆传动使动触头与静触头接触,接通电路。电磁线圈断电后,动铁芯在复位弹簧作用下自动返回,俗称释放,触头分开,电路分断。
扩展资料:
交流接触器常采用双断口电动灭弧、纵缝灭弧和栅片灭弧三种灭弧 *** 。用以消除动、静触头在分、合过程中产生的电弧。容量在10A 以上的接触器都有灭弧装置。交流接触器还有反作用弹簧、缓冲弹簧、触头压力弹簧、传动机构、底座及接线柱等辅助部件
交流接触器的工作原理是利用电磁力与弹簧弹力相配合,实现触头的接通和分断的。交流接触器有两种工作状态: 失电状态(释放状态) 和得电状态(动作状态)。当吸引线圈通电后,使静铁芯产生电磁吸力,衔铁被吸合,与衔铁相连的连杆带动触头动作,使常闭触头断接触器处于得电状态;当吸引线圈断电时,电磁吸力消失,衔铁在复开,使常开触头闭合,位弹簧作用下释放,所有触头随之复位,接触器处于失电状态。
交流接触器利用主接点来控制电路,用辅助接点来导通控制回路。主接点一般是常开接点,而辅助接点常有两对常开接点和常闭接点,小型的接触器也经常作为中间继电器配合主电路使用。
交流接触器的接点,由银钨合金制成,具有良好的导电性和耐高温烧蚀性。交流接触器动作的动力源于交流通过带铁芯线圈产生的磁场,电磁铁芯由两个「山」字形的幼硅钢片叠成,其中一个固定铁芯,套有线圈,工作电压可多种选择。为了使磁力稳定,铁芯的吸合面加上短路环。交流接触器在失电后,依靠弹簧复位。
另一半是活动铁芯,构造和固定铁芯一样,用以带动主接点和辅助接点的闭合断开。20A以上的接触器加有灭弧罩,利用电路断开时产生的电磁力,快速拉断电弧,保护接点。接触器可高频率操作,做为电源开启与切断控制时﹐更高操作频率可达每小时1200次。
接触器的使用寿命很高,机械寿命通常为数百万次至一千万次,电寿命一般则为数十万次至数百万次。
参考资料:百度百科-交流接触器
交流接触器的用途是什么?
交流接触器作用是用于接通、分断线路、或频繁的控制电动机等设备运行。经常运用于电动机做为控制对象,也可用作控制工厂设备、电热器、工作母机和各样电力机组等电力负载。
交流接触器的工作原理:利用电磁力与弹簧弹力相配合,实现触头的接通和分断。通常有两种工作状态:失电状态和得电状态。当吸引线圈通电后,使静铁芯产生电磁吸力,衔铁被吸合,与衔铁相连的连杆带动触头动作,使常闭触头断接触器处于得电状态;当吸引线圈断电时,电磁吸力消失,衔铁在复开,使常开触头闭合,位弹簧作用下释放,所有触头随之复位,接触器处于失电状态。
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