定子串电阻启动_精品文档PPT推荐.pptx

1、定子串电阻启动,电动机启动时，在电动机的定子绕组上串联电阻，由于电阻的分压作用，使加在电动机的定子绕组上的电压低于电源电压，待启动后，再将电阻短接，电动机便在额定电压下正常运行。#,手动控制串联电阻降压启动,电路组成分析,手动控制串联电阻降压启动,合上电源开关QS1，电动机串联电阻降压启动,手动控制串联电阻降压启动,合上QS2，电阻R被短接，电动机全压正常运转,定子串电阻降压起动控制线路,4）工作原理5）电路改进,从前面分析可知，本线路在起动结束后，KM1、KT一直得电工作。#为了减少能量损耗，延长接触器、继电器得使用寿命，要求M起动以后，KM1、KT断电。#,SB1,KM1,KM2,时间继电

2、器控制串联电阻降压启动,FU1,FU2,KM1,KM2,FR,SB2,KM1,KM1,KM2,FR,U,V,W,QS,KM2,KT,KT,M3,L1L2L3,SB1,KM1,KM2,时间继电器控制串联电阻降压启动,FU1,FU2,KM1,KM2,FR,SB2,KM1,KM1,KM2,FR,U,V,W,QS,KM2,KT,KT,M3,L1L2L3,合上电源开关QS,L1L2L3,SB1,KM1,KM2,时间继电器控制串联电阻降压启动,FU1,FU2,KM1,KM2,FR,SB2,KM1,KM1,KM2,FR,U,V,W,QS,KM2,KT,KT,M3,降压启动:#按下SB1KM1线圈得电,KM1

3、,L1L2L3,SB1,KM1,KM2,时间继电器控制串联电阻降压启动,FU1,FU2,KM2,FR,SB2,KM1,KM1,KM2,FR,U,V,W,QS,KM2,KT,KT,M3,KM1自锁触头闭合,自锁KM1主触头闭合,电动机降压启动KM1动合辅助触头闭合,KT线圈得电,KM1,L1L2L3,SB1,KM1,KM2,时间继电器控制串联电阻降压启动,FU1,FU2,KM2,FR,SB2,KM1,KM1,KM2,FR,U,V,W,QS,KM2,KT,KT,M3,松开SB1,继续电动机降压启动,KT,KM1,L1L2L3,SB1,KM1,KM2,时间继电器控制串联电阻降压启动,FU1,FU2,

4、KM2,FR,SB2,KM1,KM1,KM2,FR,U,V,W,QS,KM2,KT,M3,KT延时闭合,KM2线圈得电,KT,KM1,L1L2L3,SB1,KM1,KM2,时间继电器控制串联电阻降压启动,FU1,FU2,KM2,FR,SB2,KM1,KM1,KM2,FR,U,V,W,QS,KM2,KT,M3,KM2 联锁触头断开,对KM1联锁,KM1线圈失电,KT,KM1,L1L2L3,SB1,KM1,KM2,时间继电器控制串联电阻降压启动,FU1,FU2,KM2,FR,SB2,KM1,KM1,KM2,FR,U,V,W,QS,KM2,KT,M3,KM2 自锁触头闭合,自锁KM2主触头闭合,电阻被短路,KT,KM1,L1L2L3,SB1,KM1,KM2,时间继电器控制串联电阻降压启动,FU1,FU2,KM2,FR,SB2,KM1,KM1,KM2,FR,U,V,W,QS,KM2,KT,M3,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,SB1,KM1,KM2,时间继电器控制串联电阻降压启动,FU1,FU2,KM1,KM2,FR,SB2,KM1,KM1,KM2,FR,U,V,W,QS,KM2,KT,KT,M3,L1L2L3,停：#按下SB2,谢谢观看,