三相异步电动机的制动控制线路.ppt

电磁抱闸断电制动控制线路L1L2L3FU1FU2KMSB2SB1KMYBQSKM停:按SB1，接触器KM失电释放电磁抱闸线圈YB也失电，在弹簧的作用下，闸瓦与闸轮紧紧抱住KHKHM3～电磁抱闸通电制动控制线路L1L2L3FU1FU2KM1KHSB1SB2KM1YBQSKM1KHM3～KM2KM2KM1电路组成分析电磁抱闸通电制动控制线路L1L2L3FU1KM1SB1SB2KM1QSKM1KM2KM1合上电源开关QSKM2KHKHM3～FU2YBKM2电磁抱闸通电制动控制线路L1L2L3FU1KM1SB1SB2KM1QSKM1KM2KM1按下SB1KM1线圈得电KM2KHKHM3～FU2YBKM2电磁抱闸通电制动控制线路L1L2L3FU1KM1SB1SB2KM1QSKM1KM2KM1KM1自锁触头闭合,自锁，松开SB1KM1联锁触头断开，KM1主触头闭合电动机起动运行电磁抱闸线圈YB不得电KM2KHKHM3～YBKM2FU2电磁抱闸通电制动控制线路L1L2L3FU1KM1SB1SB2KM1QSKM1KM2KM1KM2停：按下SB2KM1线圈失电释放KM2线圈得电，KM2主触头闭合电磁抱闸线圈YB得电，使闸瓦与闸轮紧紧抱住KHKHM3～YBFU2电力制动电动机产生一个和电动机实际旋转方向相反的电磁转矩，使电动机迅速停转。（一）反接制动１.反接制动原理在停车时，把电动机反接，则其定子旋转磁场便反向旋转，在转子上产生的电磁转矩亦随之变为反向，成为制动转矩。反接制动单向启动反接制动控制M3～L1L2L3FU1FU2KM1KM2KHSB1KM1SB2KM2KM1KM2KHQSＲKM1nKSKM2KS单向启动反接制动控制L1L2L3FU1FU2KM2SB1KM1SB2QSＲKM1nKSKM2KS合上电源开关QSM3～KM1KHKM2KHKM1KM2单向启动反接制动控制L1L2L3FU1FU2KM2SB1KM1SB2KM1KM2QSＲKM1nKSKM2KS按下SB1KM1线圈得电M3～KM1KHKM2KH单向启动反接制动控制L1L2L3FU1FU2KM2SB1KM1SB2KM1KM2QSＲKM1KSKM2KSnKM1自锁触头闭合,自锁，松开SB1KM1主触头闭合,电动机起动，运行在转速高到一定值时，KS闭合M3～KM1KHKM2KH单向启动反接制动控制L1L2L3FU1FU2KM2SB1KM1SB2KM1KM2QSＲKM1KM2KSn停：按下SB2KM1失电释放KM2线圈得电，KM2主触头闭合，电动机串联电阻反接，反接制动KM2自锁触头闭合M3～KM1KHKM2KHKS单向启动反接制动控制L1L2L3FU1FU2KM2SB1KM1SB2KM1KM2QSＲKM1KM2KSn停：松开SB2继续反接制动M3～KM1KHKM2KHKS单向启动反接制动控制L1L2L3FU1FU2KM2SB1KM1SB2KM1KM2QSＲnKM2KS当转速降低到一定值时，KS断开KM2线圈失电，各触头复位M3～KM1KHKM2KHKM1KS能耗制动电动机切断交流电源后，立即在定子线组的任意两相中通入直流电，利用转子感应电流受静止磁场的作用以达到制动目的。单向启动能耗制动自动控制线路M3～L1L2L3KM1KHSB1KM1SB2KM2KM1KM2KHKM1KTKM2VUWQSFU1FU2KTKTKM2电路组成分析定子绕组直流电通路KM2VKM2L3NV定子绕组直流电通路单向启动能耗制动自动控制线路L1L2L3KM1SB1KM1SB2KM2KM1KM2KM1KTKM2QSFU1FU2KTKTKM2合上电源开关QS按下SB1KM1线圈得电KM2VM3～KHKHVUW单向启动能耗制动自动控制线路L1L2L3KM1SB1KM1SB2KM2KM1KM2KM1KTKM2QSFU1FU2KTKTKM2