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1、任务5 三相异步电动机的 降压启动控制线路,全压启动：启动时加在电动机定子绕组上的电压为电动机的额定电压。 降压启动：利用启动设备将电压适当降低后，加到电动机的定子绕组上进行启动，待电动机启动运转后，再使其电压恢复到额定电压正常运转。 电动机的直接启动条件：,1,项目五三相异步电动机的降压启动控制线路,M 3,L1L2L3,FU1,FU2,KM1,KM2,FR,SB1,SB2,KM1,KM2,KM1,KM2,FR,U,V,W,QS,KM2,KT,KM1,2.时间继电器控制串联电阻降压启动,KT,2,项目五三相异步电动机的降压启动控制线路,L1L2L3,FU1,FU2,KM1,KM2,SB1,S
2、B2,KM1,KM2,KM1,KM2,U,V,W,QS,KM2,KT,KM1,合上电源开关QS,M 3,FR,FR,2.时间继电器控制串联电阻降压启动,KT,3,项目五三相异步电动机的降压启动控制线路,L1L2L3,FU1,FU2,KM1,KM2,SB1,SB2,KM1,KM2,KM1,KM2,U,V,W,QS,KM2,KT,KM1,降压启动: 按下SB1 KM1线圈得电,M 3,FR,FR,2.时间继电器控制串联电阻降压启动,KT,4,项目五三相异步电动机的降压启动控制线路,L1L2L3,FU1,FU2,KM1,KM2,SB1,SB2,KM1,KM2,KM1,KM2,U,V,W,QS,KM2
3、,KT,KM1,松开SB1, 继续电动机降压启动,M 3,FR,FR,2.时间继电器控制串联电阻降压启动,KT,5,项目五三相异步电动机的降压启动控制线路,L1L2L3,FU1,FU2,KM1,KM2,SB1,SB2,KM1,KM2,KM1,KM2,U,V,W,QS,KM2,KT,KM1,KT延时闭合, KM2线圈得电,M 3,FR,FR,2.时间继电器控制串联电阻降压启动,KT,6,项目五三相异步电动机的降压启动控制线路,L1L2L3,FU1,FU2,KM1,KM2,SB1,SB2,KM1,KM2,KM1,KM2,U,V,W,QS,KM2,KT,KM1,KM2 联锁触头断开,对KM1联锁,K
4、M1线圈失电,M 3,FR,FR,2.时间继电器控制串联电阻降压启动,KT,7,项目五三相异步电动机的降压启动控制线路,L1L2L3,FU1,FU2,KM1,KM2,SB1,SB2,KM1,KM2,KM1,KM2,U,V,W,QS,KM2,KT,KM1,KM2 自锁触头闭合,自锁 KM2主触头闭合,电阻被短路,M 3,FR,FR,2.时间继电器控制串联电阻降压启动,KT,8,项目五三相异步电动机的降压启动控制线路,L1L2L3,FU1,FU2,KM1,KM2,SB1,SB2,KM1,KM2,KM1,KM2,U,V,W,QS,KM2,KT,KM1,KM1自锁触头闭合,自锁 KM1主触头闭合,电动
5、机降压启动KM1动合辅助触头闭合,KT线圈得电,M 3,FR,FR,2.时间继电器控制串联电阻降压启动,KT,9,项目五三相异步电动机的降压启动控制线路,L1L2L3,FU1,FU2,KM1,KM2,SB1,SB2,KM1,KM2,KM1,KM2,U,V,W,QS,KM2,KT,KM1,KM1自锁触头断开,解除自锁 KM1主触头断开，电动机全压运行 KM1动合辅助触头断开,KT线圈失电,KT延时闭合触头瞬时断开,M 3,FR,FR,2.时间继电器控制串联电阻降压启动,KT,10,项目五三相异步电动机的降压启动控制线路,L1L2L3,FU1,FU2,KM1,KM2,SB1,SB2,KM1,KM2
6、,KM1,KM2,U,V,W,QS,KM2,KT,KM1,停： 按下SB2,M 3,FR,FR,2.时间继电器控制串联电阻降压启动,KT,11,项目五三相异步电动机的降压启动控制线路,二、自耦变压器降压启动控制线路,自耦变压器降压启动：在电动机启动时利用 自耦变压器来降低加在电动机定子绕组上的启动 电压。待电动机启动后，再使电动机与自耦变压 器脱离，从而在全压下正常运行。,12,项目五三相异步电动机的降压启动控制线路,U1,V1,W1,KM3,SB2,KM1,KT,KM2,SB1,KM3,L1L2L3,FU1,FU2,FR,KM3,QS,KM2,KT,KM1,KT,KM1,KM2,KM3,KM
7、1,TM,13,项目五三相异步电动机的降压启动控制线路,U1,V1,W1,KM3,SB2,KM1,KT,KM2,SB1,KM3,L1L2L3,FU1,FU2,KM3,QS,KM2,KT,KM1,KM1,KM2,KM3,KM1,合上电源开关QS,TM,FR,KT,14,项目五三相异步电动机的降压启动控制线路,U1,V1,W1,KM3,SB2,KM1,KT,KM2,SB1,KM3,L1L2L3,FU1,FU2,KM3,QS,KM2,KT,KM1,KM1,KM2,KM3,KM1,按SB2 KM1线圈得电,TM,FR,KT,15,项目五三相异步电动机的降压启动控制线路,U1,V1,W1,KM3,SB2
8、,KM1,KT,KM2,SB1,KM3,L1L2L3,FU1,FU2,KM3,QS,KM2,KT,KM1,KM1,KM2,KM3,KM1,KM1联锁触头分断，对KM3联锁，KM1主触头闭合，自耦变压器TM联结成星形 KM1动合辅助触头闭合，KM2线圈得电，KT线圈得电,TM,FR,KT,16,项目五三相异步电动机的降压启动控制线路,U1,V1,W1,KM3,SB2,KM1,KT,KM2,SB1,KM3,L1L2L3,FU1,FU2,KM3,QS,KM2,KT,KM1,KM1,KM2,KM3,KM1,KM2主触头闭合，电动机M接入电机降压启动 KM2动合辅助触头闭合，自锁，松开SB2,TM,FR
9、,KT,17,项目五三相异步电动机的降压启动控制线路,U1,V1,W1,KM3,SB2,KM1,KT,KM2,SB1,KM3,L1L2L3,FU1,FU2,KM3,QS,KM2,KT,KM1,KM1,KM2,KM3,KM1,KT延时断开的动断触头延时分断 KM1线圈失电 KT延时闭合的动合触头延时闭合,TM,FR,KT,18,项目五三相异步电动机的降压启动控制线路,U1,V1,W1,KM3,SB2,KM1,KT,KM2,SB1,KM3,L1L2L3,FU1,FU2,KM3,QS,KM2,KT,KM1,KM1,KM2,KM3,KM1,KM1线圈失电KM1动合触头分断KM1主触头分断 电动机M失电
10、惯性运行 KM1联锁触头闭合,TM,FR,KT,19,项目五三相异步电动机的降压启动控制线路,U1,V1,W1,KM3,SB2,KM1,KT,KM2,SB1,KM3,L1L2L3,FU1,FU2,KM3,QS,KM2,KT,KM1,KM1,KM2,KM3,KM1,KM3线圈得电KM3 自锁触头闭合 ，自锁M3主触头闭合 电动机M全压运行,TM,FR,KT,20,项目五三相异步电动机的降压启动控制线路,U1,V1,W1,KM3,SB2,KM1,KT,KM2,SB1,KM3,L1L2L3,FU1,FU2,KM3,QS,KM2,KT,KM1,KM1,KM2,KM3,KM1,KM3联锁触头分断 KM2
11、线圈失电 KM2主触头分断 KM2自锁触头分断,TM,FR,KT,21,项目五三相异步电动机的降压启动控制线路,U1,V1,W1,KM3,SB2,KM1,KT,KM2,SB1,KM3,L1L2L3,FU1,FU2,KM3,QS,KM2,KT,KM1,KM1,KM2,KM3,KM1,KT延时断开的动断触头瞬时闭合 KT延时闭合的动合触头瞬时断开,TM,FR,KT,22,项目五三相异步电动机的降压启动控制线路,U1,V1,W1,KM3,SB2,KM1,KT,KM2,SB1,KM3,L1L2L3,FU1,FU2,KM3,QS,KM2,KT,KM1,KM1,KM2,KM3,KM1,停： 按SB1,TM
12、,FR,KT,23,项目五三相异步电动机的降压启动控制线路,电动机启动时，把电动机的定子绕组接成 星形，电动机定子绕组电压低于电源电压起 动，启动即将完毕时再恢复成三角形，电动机 便在额定电压下正常运行。,三、Y降压启动控制线路,24,项目五三相异步电动机的降压启动控制线路,L1L2L3,FU1,FU2,KM,KM,SB1,SB2,KM,U,V,W,QS,KMY,KM,KMY,KM,KMY,KT,KM,电路组成分析,KMY,KT,M 3,FR,FR,2. 时间继电器自动控制Y降压启动控制线路,25,项目五三相异步电动机的降压启动控制线路,L1L2L3,FU1,FU2,KM,KM,SB1,SB2
13、,KM,U,V,W,QS,KMY,KM,KMY,KM,KMY,KT,KM,合上电源开关QS,KMY,KT,M 3,FR,FR,2. 时间继电器自动控制Y降压启动控制线路,26,项目五三相异步电动机的降压启动控制线路,L1L2L3,FU1,FU2,KM,KM,SB1,SB2,KM,U,V,W,QS,KMY,KM,KMY,KM,KMY,KT,KM,降压启动: 按下SB1 KT线圈得电 KMY线圈得电,KMY,KT,M 3,FR,FR,2. 时间继电器自动控制Y降压启动控制线路,27,项目五三相异步电动机的降压启动控制线路,L1L2L3,FU1,FU2,KM,KM,SB1,SB2,KM,U,V,W,
14、QS,KMY,KM,KMY,KM,KMY,KT,KM,KMY主触头闭合 KMY动合辅助触头闭合 KMY动断辅助触头断开 KM自锁触头闭合 KM主触头闭合 电动机降压启动,KMY,KT,M 3,FR,FR,2. 时间继电器自动控制Y降压启动控制线路,28,项目五三相异步电动机的降压启动控制线路,L1L2L3,FU1,FU2,KM,KM,SB1,SB2,KM,U,V,W,QS,KMY,KM,KMY,KM,KMY,KT,KM,松开SB1 电动机继续 降压启动,KMY,KT,M 3,FR,FR,2. 时间继电器自动控制Y降压启动控制线路,29,项目五三相异步电动机的降压启动控制线路,L1L2L3,FU
15、1,FU2,KM,KM,SB1,SB2,KM,U,V,W,QS,KMY,KM,KMY,KM,KMY,KT,KM,KT延时断开的动断触头延时分断 KMY线圈失电 KMY主触头断开 KMY动合辅助触头断开 KMY动断辅助触头闭合 KM 主触头闭合 KM 动断辅助触头断开 KT线圈失电 电动机全压运行,KMY,KT,M 3,FR,FR,2. 时间继电器自动控制Y降压启动控制线路,30,项目五三相异步电动机的降压启动控制线路,L1L2L3,FU1,FU2,KM,KM,SB1,SB2,KM,U,V,W,QS,KMY,KM,KMY,KM,KMY,KT,KM,停: 按下SB2,KMY,KT,M 3,FR,F
16、R,2. 时间继电器自动控制Y降压启动控制线路,31,项目五三相异步电动机的降压启动控制线路,KT,KM2,SB2,KM3,KM1,KT,SB1,KM2,延边三角形降压启动控制原理,L1L2L3,FU1,FU2,FR,KM1,KM2,U1,V1,W1,QS,KM1,KM2,W3,U3,V3,W2,U2,V2,KM3,KT,KM3,KM3,电路组成分析,M 3,32,项目五三相异步电动机的降压启动控制线路,KT,KM2,SB2,KM3,KM1,KT,SB1,KM2,L1L2L3,FU1,FU2,FR,KM1,KM2,U1,V1,W1,QS,KM1,KM2,W3,U3,V3,W2,U2,V2,KM
17、3,KT,KM3,KM3,合上电源开关QS,延边三角形降压启动控制原理,M 3,33,项目五三相异步电动机的降压启动控制线路,KT,KM2,SB2,KM3,KM1,KT,SB1,KM2,L1L2L3,FR,KM1,KM2,U1,V1,W1,KM1,KM2,W3,U3,V3,W2,U2,V2,KM3,KT,KM3,KM3,按SB2 KM3线圈得电,FU1,FU2,QS,延边三角形降压启动控制原理,M 3,34,项目五三相异步电动机的降压启动控制线路,KT,KM2,SB2,KM3,KM1,KT,SB1,KM2,L1L2L3,FR,KM1,KM2,U1,V1,W1,KM1,KM2,W3,U3,V3,
18、W2,U2,V2,KM3,KT,KM3,KM3,KM3联锁触头分断，对KM2联锁KM3主触头闭合 联结成延边三角形 KM 动合辅助触头闭合,FU1,FU2,QS,延边三角形降压启动控制原理,M 3,35,项目五三相异步电动机的降压启动控制线路,KT,KM2,SB2,KM3,KM1,KT,SB1,KM2,L1L2L3,FR,KM1,KM2,U1,V1,W1,KM1,KM2,W3,U3,V3,W2,U2,V2,KM3,KT,KM3,KM3,KM1线圈得电KM1自锁触头闭合,自锁,松开SB2 KM1主触头闭合,电动机延边三角形降压启动, KT线圈得电,FU1,FU2,QS,延边三角形降压启动控制原理
19、,M 3,36,项目五三相异步电动机的降压启动控制线路,KT,KM2,SB2,KM3,KM1,KT,SB1,KM2,L1L2L3,FR,KM1,KM2,U1,V1,W1,KM1,KM2,W3,U3,V3,W2,U2,V2,KM3,KT,KM3,KT线圈得电KT延时断开的动断触头延时分断 , KM3线圈失电 KT延时闭合的动合触头延时闭合， KM2线圈得电,FU1,FU2,QS,延边三角形降压启动控制原理,M 3,37,项目五三相异步电动机的降压启动控制线路,KT,KM2,SB2,KM3,KM1,KT,SB1,KM2,L1L2L3,FR,KM1,KM2,U1,V1,W1,KM1,KM2,W3,U
20、3,V3,W2,U2,V2,KM3,KT,KM3,KM3线圈失电 KM3动合触头分断， KM3主触头分断，电动机失电惯性运行KM2线圈得电KM2自锁触头闭合，自锁,FU1,FU2,QS,延边三角形降压启动控制原理,M 3,38,项目五三相异步电动机的降压启动控制线路,KT,KM2,SB2,KM3,KM1,KT,SB1,KM2,L1L2L3,FR,KM1,KM2,U1,V1,W1,KM1,KM2,W3,U3,V3,W2,U2,V2,KM3,KT,KM3,KM2主触头闭合，电动机全电运行 KM2联锁触头断开，KT线圈失电,KT触头复位,KM3,FU1,FU2,QS,延边三角形降压启动控制原理,M 3,39,项目五三相异步电动机的降压启动控制线路,KT,KM2,SB2,KM3,KM1,KT,SB1,KM2,L1L2L3,FU1,FU2,FR,KM1,KM2,U1,V1,W1,QS,KM1,KM2,W3,U3,V3,W2,U2,V2,KM3,KT,KM3,KM3,停: 按下SB1,延边三角形降压启动控制原理,M 3,40,项目五三相异步电动机的降压启动控制线路,