课题六三相异步电动机的制动控制线路.ppt
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1、课题六 三相异步电动机的制动控制线路,所谓制动,就是给电动机一个与转动方向相反的转矩使它迅速停转(或限制其转速)。制动的方法一般有两类:机械制动和电力制动。,一、机械制动 当电动机的定子绕组断电后,利用机械装置使电动机立即停转。,电磁抱闸制动器,MZD1系列交流单相制动电磁铁 TJ2系列闸瓦制动器,1线圈 2衔铁 3铁心 4弹簧 5闸轮 6杠杆 7闸瓦 8轴,电磁抱闸制动器结构示意图,电磁抱闸断电制动控制线路,L1L2L3,FU1,FU2,KM,KH,SB2,SB1,KM,YB,QS,KM,KH,M3,电磁抱闸断电制动控制线路,L1L2L3,FU1,FU2,KM,SB2,SB1,KM,YB,Q
2、S,KM,合上电源开关QS,KH,KH,M3,电磁抱闸断电制动控制线路,L1L2L3,FU1,FU2,KM,SB2,SB1,KM,YB,QS,KM,按下SB2KM线圈得电,KH,KH,M3,电磁抱闸断电制动控制线路,L1L2L3,FU1,FU2,KM,SB2,SB1,KM,YB,QS,KM,KM1自锁触头闭合,自锁,松开SB2电磁抱闸线圈YB得电,使抱闸的闸瓦与闸轮分开KM1主触头闭合,电动机起动运行,KH,KH,M3,电磁抱闸断电制动控制线路,L1L2L3,FU1,FU2,KM,SB2,SB1,KM,YB,QS,KM,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
3、瓦与闸轮紧紧抱住,KH,KH,M3,思考,这个电路有什么问题?我们可以怎么避免?,二、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.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。,单向启动反接制动控制,M3,L1L2L3,FU1,FU2,KM1,KM2,KH,SB1,KM1,SB2,KM2,KM1,KM2,KH,QS,KM1,n,KS,KM2,KS,单向启动反接制动控制,L1L2L3,FU1,FU2,KM2,SB1,KM1,SB2,QS,KM1,n,KS,KM2,KS,合上电
4、源开关QS,M3,KM1,KH,KM2,KH,KM1,KM2,单向启动反接制动控制,L1L2L3,FU1,FU2,KM2,SB1,KM1,SB2,KM1,KM2,QS,KM1,n,KS,KM2,KS,按下SB1KM1线圈得电,M3,KM1,KH,KM2,KH,单向启动反接制动控制,L1L2L3,FU1,FU2,KM2,SB1,KM1,SB2,KM1,KM2,QS,KM1,KS,KM2,KS,KM1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,KM1,KH,KM2,KH,单向启动反接制动控制,L1L2L3,FU1,FU2,KM2,SB1,KM
5、1,SB2,KM1,KM2,QS,KM1,KM2,KS,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,KM1,KH,KM2,KH,KS,单向启动反接制动控制,L1L2L3,FU1,FU2,KM2,SB1,KM1,SB2,KM1,KM2,QS,KM1,KM2,KS,停:松开SB2继续反接制动,M3,KM1,KH,KM2,KH,KS,单向启动反接制动控制,L1L2L3,FU1,FU2,KM2,SB1,KM1,SB2,KM1,KM2,QS,n,KM2,KS,当转速降低到一定值时,KS断开KM2线圈失电,各触头复位,M3,KM1,K
6、H,KM2,KH,KM1,KS,(二)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。,M3,L1L2L3,KM1,KH,SB1,KM1,SB2,KM2,KM1,KM2,KH,KM1,KT,KM2,V,U,W,QS,FU1,FU2,KT,KT,单向启动能耗制动自动控制线路,KM2,电路组成分析,定子绕组直流电通路,KM2,V,KM2,L3,N,V,定子绕组直流电通路,L1L2L3,KM1,SB1,KM1,SB2,KM2,KM1,KM2,KM1,KT,KM2,QS,FU1,FU2,KT,KT,KM2,合上电源开关QS按下SB1
7、KM1线圈得电,单向启动能耗制动自动控制线路,KM2,V,M3,KH,KH,V,U,W,L1L2L3,KM1,SB1,KM1,SB2,KM2,KM1,KM2,KM1,KT,KM2,QS,FU1,FU2,KT,KT,KM2,KM1自锁触头闭合KM1主触头闭合KM1联锁触头分断,单向启动能耗制动自动控制线路,KM2,V,M3,KH,KH,V,U,W,L1L2L3,KM1,SB1,KM1,SB2,KM2,KM1,KM2,KM1,KT,KM2,KM2,V,QS,FU1,FU2,KT,KT,KM2,按下SB2KM1线圈失电KM1自锁触头分断KM1主触头分断KM1联锁触头闭合KM2线圈得电KT线圈得电,单
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