电力拖动接线ppt课件.ppt

电动机控制电路,1,电动机的联接,三相电动机有三个定子绕组，分别用U、V、W表示，每个绕组有两端，所以一共有六个接线端,电动机的联接有两种方式，一种为星型联接，另一种为三角型联接,星型接法,三角型接法,2,电动机的联接,星型接法,三角型接法,3,直接控制原理,合上QS,电动机启动。,启动,优点：设备简单，安装容易缺点：只适用于小功率不频繁启动,保护：短路保护、漏电保护,L1L2L3,线码：同一导线线码相同经过用电器线码改变,4,QS,KM1,KM2,SB1,SB2,KH,SB3,5,点动控制原理,得电,启动,6,点动控制原理,失电,停止,7,点动控制原理,KM,KH,.,.,SB,KH,3,M,KM,QS,FU1,FU2,线码,8,QS,KM1,KM2,SB1,SB2,KH,SB3,9,连续控制原理,KM,KH,.,.,SB2,KH,3,M,KM,QS,FU1,FU2,KM,启动,得电,SB1,合上开关QS,按下起动按钮SB2,KM线圈得电，,KM辅助触点闭合自锁。,松开起动按钮SB2,10,连续控制原理,KM,KH,.,.,SB2,KH,3,M,KM,QS,FU1,FU2,KM,停止,失电,SB1,按下停止按钮SB1,KM线圈失电，,KM辅助触点断开，解自锁。,11,连续控制原理,KM,KH,.,.,SB2,KH,3,M,KM,QS,FU1,FU2,KM,SB1,电路保护,短路保护,过载保护,漏电保护,失压保护,12,连续控制原理,KM,KH,.,.,SB2,KH,3,M,KM,QS,FU1,FU2,KM,SB1,线码,.,.,13,QS,KM1,KM2,SB1,SB2,KH,SB3,14,电动机正反转的控制线路,将电动机接到电源的任意两根线对调一下，即可使电动机反转。,需要用两个接触器来实现这一要求。当正转接触器工作时，电动机正转；当反转接触器工作时，将电动机接到电源的任意两根联线对调一下，电动机反转。,演示,15,连续正反转控制原理,16,连续正反转控制原理,SB2和SB3决不允许同时按下，否则造成电源两相短路。,正转按钮,反转按钮,反转接触器,正转接触器,反转触点,正转触点,17,连续正反转控制原理,L1,L2,L3,18,连续正反转控制原理,合上QS,按下正转启动按钮SB2，常闭触点断开，互锁；常开触点闭合，KM1线圈得电，KM1主触点闭合，电动机正转，KM1常开辅助触点闭合，自锁,19,连续正反转控制原理,.,FU1,FU2,.,KH,.,SB2,KH,3,M,KM1,QS,KM1,SB1,.,.,.,.,SB3,KM2,KM1,KM2,KM2,.,.,.,.,.,.,合上QS,按下反转启动按钮SB2，常闭触点断开，互锁；常开触点闭合，KM2线圈得电，KM2主触点闭合，电动机正转，KM2常开辅助触点闭合，自锁,20,连续正反转控制原理,合上QS,按下正转启动按钮SB2，反转停止，正转启动。,先断开,失电,闭合,得电,断开,闭合,21,连续正反转控制原理,线码,22,QS,KM1,KM2,SB1,SB2,KH,SB3,23,24,25,26,FR,SB2,FU2,KM3,SB1,KM1,KM2,.,.,.,.,.,KM1,KM2,1,0,2,3,4,5,6,7,KT,KT,KM1,.,.,27,28,29,30,QS,KM1,KM2,SB1,SB2,KH,1,1,SB3,3,3,3,3,3,2,2,4,4,4,5,5,0,0,0,6,6,6,7,7,31,连续正反转控制原理,FU2,KH,SB2,KM1,SB1,SB3,KM2,KM1,KM2,.,.,.,.,.,.,2,3,4,5,6,7,.,.,.,.,SB4,SB5,9,8,32,QS,SB1,SB2,1,SB3,3,3,3,3,3,2,4,7,6,6,5,0,0,0,7,9,6,8,8,SB4,SB5,3,3,7,7,9,7,4,5,33,连续正反转控制原理,FU2,KH,SB2,KM1,SB1,SB3,KM2,KM1,KM2,.,.,.,.,.,.,2,3,4,5,6,7,.,.,.,.,SB4,SB5,9,8,KM1,KM2,34,QS,SB1,SB2,1,SB3,3,3,3,3,3,2,4,7,6,6,5,0,0,0,7,9,6,8,8,SB4,SB5,3,3,7,7,9,7,4,5,35,FR,SB2,FU2,KM2,SB1,KM1,KA,.,.,.,.,.,.,KM3,KM3,1,0,2,3,4,5,6,7,KT,KT,KM1,.