点击图片查看大图QM200DY-2HB QM200DY2HB
VRDM368/50LHA
QM200DY-2HB QM200DY2HB
接触器分为交流接触器（电压AC）和直流接触器（电压DC），它应用于电力、配电与用电场合。接触器广义上是指工业电中利用线圈流过电流产生磁场，使触头闭合，以达到控制负载的电器。 在电工学上，因为可快速切断交流与直流主回路和可频繁地接通与大电流控制（达800A）电路的装置，所以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，接触器不仅能接通和切断电路，而且还具有低电压释放保护作用。接触器控制容量大，适用于频繁操作和远距离控制，是自动控制系统中的重要元件之一。 虽然独立的ADC可以感应每个参数，但是采用单个ADC并在它前面加设一个多路复用路往往是更加常用的方法。
①按主触点极数分 可分为单极、双极、三极、四极和五极接触器。单极接触器主要用于单相负荷，如照明负荷、焊机等，在电动机能耗制动中也可采用；双极接触器用于绕线式异步电机的转子回路中，起动时用于短接起动绕组；三极接触器用于三相负荷，例如在电动机的控制及其它场合，使用为广泛；四极接触器主要用于三相四线制的照明线路，也可用来控制双回路电动机负载；五极交流接触器用来组成自耦补偿起动器或控制双笼型电动机，以变换绕组接法。 栅极电阻也不是越小越好，当栅极电阻很小时，IGBT的CE间电压尖峰过大 栅极电阻很大时，又会增大开关损耗。
②按灭弧介质分 可分为空气式接触器、真空式接触器等。依靠空气绝缘的接触器用于一般负载，而采用真空绝缘的接触器常用在煤矿、石油、化工企业及电压在660V和1140V等一些特殊的场合。 重要的是，对于模拟或数字控制结构而言，输入和输出滤波器以及电源器件将基本上保持相同。
③按有无触点分 可分为有触点接触器和无触点接触器。常见的接触器多为有触点接触器，而无触点接触器属于电子技术应用的产物，一般采用晶闸管作为回路的通断元件。由于可控硅导通时所需的触发电压很小，而且回路通断时无火花产生，因而可用于高操作频率的设备和易燃、易爆、无噪声的场合。
福州卓凯电子科技有限公司
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