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1、.,1,电动机正反转控制电路,.,2,主要内容2.2.2三相异步电动机的正反转控制线路,三相异步电动机反转方法实现电路,.,3,若改变电动机转动方向，将接至交流电动机的三相交流电源进线中任意两相对调，电动机就可以反转。,1. 三相异步电动机反转方法,.,4,2. 实现电路,倒顺开关正反转控制线路接触器联锁正反转控制线路按钮、接触器双重联锁正反转控制线路,.,5,倒顺开关，又叫可逆转换开关，利用改变电源相序来实现电动机手动正反转控制。,实现电路倒顺开关正反转控制线路,.,6,实现电路倒顺开关正反转控制线路,.,7,L1 L2 L3,FU,QS,电动机正转,U,V,W,U L1V L2WL3,M3
2、,熔断器,手柄扳至“顺”位置,实现电路倒顺开关正反转控制线路,.,8,L1 L2 L3,FU,QS,熔断器,电动机停转,U,V,W,手柄扳至“停”位置,M3,实现电路倒顺开关正反转控制线路,.,9,L1 L2 L3,FU,QS,熔断器,电动机反转,U,V,W,手柄扳至“倒”位置,U L3V L2WL1,M3,实现电路倒顺开关正反转控制线路,.,10,L1 L2 L3,FU,QS,熔断器,电动机停转,U,V,W,手柄扳至“停”位置,M3,实现电路倒顺开关正反转控制线路,.,11,注意事项,电动机处于正转状态时，欲使它反转必须先把手柄转到“停止”位置，使电动机先停转，然后再把手柄转到“倒转”控制位
3、置，使电动机反转。反之易然。若手柄直接从”顺转”扳到“倒转”位置，因电源突然反接，会产生很大的反接电流，易使电动机的定子绕组损坏。 所用控制电器较少；其缺点是操作繁琐，特别是在频繁转向控制时，操作人员劳动强度较大，不方便。且被控制的电动机的容量较小。,.,12,利用两个交流接触器交替工作，改变电源接入电动机的相序来实现电动机正反转控制。,实现电路接触器联锁正反转控制线路,.,13,L1L2L3,FU1,FU2,KM1,KM2,KH,SB2,SB3,SB1,KM1,KM2,KM1,KM2,KH,U,V,W,QS,KM2,KM1,U -L1V -L2W-L3,U -L3V -L2W-L1,M3,实
4、现电路接触器联锁正反转控制线路,.,14,L1L2L3,FU1,FU2,KM1,KM2,KH,SB2,SB3,SB1,KM1,KM2,KM1,KM2,KH,U,V,W,QS,KM2,KM1,合上电源开关QS,M3,实现电路接触器联锁正反转控制线路,.,15,L1L2L3,FU2,KM1,KM2,KH,SB2,SB3,SB1,KM1,KM2,KM1,KM2,KH,U,V,W,QS,KM2,KM1,按SB2KM1线圈得电,FU1,M3,实现电路接触器联锁正反转控制线路,.,16,L1L2L3,KM1,KM2,KH,SB2,SB3,SB1,KM1,KM2,KM1,KM2,KH,U,V,W,KM2,K
5、M1,KM1自锁触头闭合, 自锁KM1动合主触头闭合,电机正转KM1联锁触头断开对KM2联锁,FU2,QS,FU1,M3,实现电路接触器联锁正反转控制线路,.,17,L1L2L3,KM1,KM2,KH,SB2,SB3,SB1,KM1,KM2,KM1,KM2,KH,U,V,W,KM2,KM1,松开SB2电机继续正转运行,FU2,QS,FU1,M3,实现电路接触器联锁正反转控制线路,.,18,L1L2L3,FU1,FU2,KM1,KM2,KH,SB2,SB3,SB1,KM1,KM2,KM1,KM2,KH,U,V,W,QS,KM2,KM1,按下SB1,KM1线圈失电KM1自锁触头断开,解除自锁KM1
6、主触头断开,电机停转KM1联锁触头闭合，解除联锁,M3,实现电路接触器联锁正反转控制线路,.,19,L1L2L3,FU1,FU2,KM1,KM2,KH,SB2,SB3,SB1,KM1,KM2,KM1,KM2,KH,U,V,W,QS,KM2,KM1,松开SB1,M3,实现电路接触器联锁正反转控制线路,.,20,L1L2L3,KM1,KM2,KH,SB2,SB3,SB1,KM1,KM2,KM1,KM2,KH,U,V,W,KM2,KM1,按SB3KM2线圈得电,FU2,QS,FU1,M3,实现电路接触器联锁正反转控制线路,.,21,L1L2L3,KM1,KM2,KH,SB2,SB3,SB1,KM1,
7、KM2,KM1,KM2,KH,U,V,W,KM2,KM1,KM2自锁触头闭合,自锁KM2主触头闭合,电机反转KM2联锁触头断开对KM1联锁,FU2,QS,FU1,M3,实现电路接触器联锁正反转控制线路,.,22,L1L2L3,KM1,KM2,KH,SB2,SB3,SB1,KM1,KM2,KM1,KM2,KH,U,V,W,KM2,KM1,松开SB3电机继续反转,FU2,QS,FU1,M3,实现电路接触器联锁正反转控制线路,.,23,L1L2L3,FU1,FU2,KM1,KM2,KH,SB2,SB3,SB1,KM1,KM2,KM1,KM2,KH,U,V,W,QS,KM2,KM1,按下SB1,KM2
8、线圈失电KM2自锁触头断开,解除自锁KM2主触头断开,电机停转KM2联锁触头闭合，解除联锁,M3,实现电路接触器联锁正反转控制线路,.,24,L1L2L3,FU1,FU2,KM1,KM2,FR,SB2,SB3,SB1,KM1,KM2,KM1,KM2,FR,U,V,W,QS,KM2,KM1,松开SB1,M3,实现电路接触器联锁正反转控制线路,.,25,接触器联锁正反转控制线路动画演示,.,26,接触器联锁正反转控制线路电路优缺点,电动机从正转变为反转时，必须先按下停止按钮后，才能按反转启动按钮，否则由于接触器的联锁作用，不能实现反转。因此线路工作安全可靠，但操作不便。,.,27,为克服接触器联锁
9、正反转控制电路和按钮联锁正反转控制电路的不足，在按钮联锁的基础上，又增加了接触器联锁，就构成按钮、接触器双重联锁正反转控制电路。,实现电路按钮、接触器双重联锁正反转控制线路,.,28,L1L2L3,FU1,FU2,KM1,KM2,SB2,SB3,SB1,KM1,KM2,U,V,W,QS,U -L1V -L2W-L3,U -L3V -L2W-L1,KM2,KM1,M3,按钮、接触器双重联锁正反转控制线路,KH,KM1,KM2,KH,.,29,L1L2L3,FU1,FU2,KM1,KM2,SB2,SB3,SB1,KM1,KM2,U,V,W,QS,合上电源开关QS,KM2,KM1,KH,KM1,KM
10、2,KH,M3,按钮、接触器双重联锁正反转控制线路,.,30,L1L2L3,FU1,FU2,KM1,KM2,SB2,SB3,SB1,KM1,KM2,U,V,W,QS,按下SB2，SB2动断触头断开,对KM2联锁SB2动合触头闭合, KM1线圈得电,KM2,KM1,KH,KM1,KM2,KH,M3,按钮、接触器双重联锁正反转控制线路,.,31,L1L2L3,FU1,FU2,KM1,KM2,SB2,SB3,SB1,KM1,KM2,U,V,W,QS,KM1动合辅助触头闭合,对KM1自锁KM1动合主触头闭合,电机正转KM1动断触头断开对KM2联锁,KM2,KM1,KH,KM1,KM2,KH,M3,按钮
11、、接触器双重联锁正反转控制线路,.,32,L1L2L3,FU1,FU2,KM1,KM2,SB2,SB3,SB1,KM1,KM2,U,V,W,QS,松开SB2,SB2动断触头闭合SB2动合触头断开电机继续正转运行,KM2,KM1,KH,KM1,KM2,KH,M3,按钮、接触器双重联锁正反转控制线路,.,33,L1L2L3,FU1,FU2,KM1,KM2,SB2,SB3,SB1,KM1,KM2,U,V,W,QS,按下SB1,使KM1线圈失电,各触头复位,KM2,KM1,KH,KM1,KM2,KH,M3,按钮、接触器双重联锁正反转控制线路,.,34,L1L2L3,FU1,FU2,KM1,KM2,SB
12、2,SB3,SB1,KM1,KM2,U,V,W,QS,松开SB1,KM2,KM1,KH,KM1,KM2,KH,M3,按钮、接触器双重联锁正反转控制线路,.,35,L1L2L3,FU1,FU2,KM1,KM2,SB2,SB3,SB1,KM1,KM2,U,V,W,QS,或按下SB3,SB3动断触头断开,对KM1联锁, SB3动合触头闭合,KM2线圈得电,KM2,KM1,KH,KM1,KM2,KH,M3,按钮、接触器双重联锁正反转控制线路,.,36,L1L2L3,FU1,FU2,KM1,KM2,SB2,SB3,SB1,KM1,KM2,U,V,W,QS,KM2动合辅助触头闭合,对KM2自锁KM2动合主
13、触头闭合,电机反转KM2动断触头断开对KM1联锁,KM2,KM1,KH,KM1,KM2,KH,M3,按钮、接触器双重联锁正反转控制线路,.,37,L1L2L3,FU1,FU2,KM1,KM2,SB2,SB3,SB1,KM1,KM2,U,V,W,QS,松开SB3,KM2,KM1,KH,KM1,KM2,KH,M3,按钮、接触器双重联锁正反转控制线路,.,38,L1L2L3,FU1,FU2,KM1,KM2,SB2,SB3,SB1,KM1,KM2,U,V,W,QS,按下SB1,KM2线圈失电，动合辅助触头断开,解除自锁动合主触头断开电机停转,KM2,KM1,KH,KM1,KM2,KH,M3,按钮、接触器双重联锁正反转控制线路,.,39,按钮、接触器双重联锁正反转控制线路,.,40,动画演示,.,41,思考题,能否只用按钮联锁实现正反转控制？,.,42,请各位老师批评指证！,
