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1、课题十一 串励直流电动机的基本控制线路,主要特点: 1.具有较大的启动转矩,启动性能好。 2.过载能力较强。,串励直流电动机外形 串励直流电动机原理图,一、启动控制线路,1.手动启动控制线路,串励直流电动机手动启动控制电路图,QF,KT1,KT1,KM1,KM2,L+,KM2,L,SB2,SB1,KM1,KM1,KM3,R2,2.自动启动控制线路,M,R1,KM1,KT2,KM3,电路组成分析,KT2,QF,KT1,KT1,KM1,KM2,L+,KM2,L,SB2,SB1,KM1,KM1,KM3,R2,2.自动启动控制线路,M,R1,KM1,KT2,KM3,KT2,合上电源开关QF,QF,KT
2、1,KT1,KM1,KM2,L+,KM2,L,SB2,SB1,KM1,KM1,KM3,R2,2.自动启动控制线路,M,R1,KM1,KT2,KM3,KT2,按下SB1 KM1线圈得电,QF,KT1,KT1,KM1,KM2,L+,KM2,L,SB2,SB1,KM1,KM1,KM3,R2,2.自动启动控制线路,M,R1,KM1,KT2,KM3,KT2,KT1经过整定时间 KT1动断触头延时闭合,QF,KT1,KT1,KM1,KM2,L+,KM2,L,SB2,SB1,KM1,KM1,KM3,R2,2.自动启动控制线路,M,R1,KM1,KT2,KM3,KT2,KT2经过整定时间 KT2动断触头延时闭
3、合,进入正常工作,QF,KT1,KT1,KM1,KM2,L+,KM2,L,SB2,SB1,KM1,KM1,KM3,R2,2.自动启动控制线路,M,R1,KM1,KT2,KM3,KT2,按下SB2, 电动机停转,二、正反转控制线路,串励直流电动机的反转常采用励磁绕组反接法来 实现。因为串励电动机电枢绕组两端的电压很高,而 励磁绕组两端的电压较低,反接较容易。,KM3,KM2,KM2,KM1,SB2,KM2,KM3,KM1,KM2,L+,L-,KT,KM2,SB3,KM1,SB1,KT,KM1,KM1,R,QF,KM2,KM1,电路组成分析,KM2,KM1,串励直流电机正反转控制线路,KM3,KM
4、2,KM2,KM1,SB2,KM2,KM3,KM1,KM2,L+,L-,KT,KM2,SB3,KM1,SB1,KM1,KM1,R,串励直流电机正反转控制线路,QF,KM2,KM1,合上电源开关QF,KM2,KM1,KT,KM3,KM2,KM2,KM1,SB2,KM2,KM3,KM1,KM2,L+,L-,KT,KM2,SB3,KM1,SB1,KM1,KM1,R,串励直流电机正反转控制线路,QF,KM2,KM1,正转控制: 按下SB1,电动机串联电阻R正转起动,KT线圈失电,KM2,KM1,KT,KM3,KM2,KM2,KM1,SB2,KM2,KM3,KM1,KM2,L+,L-,KT,KM2,SB
5、3,KM1,SB1,KM1,KM1,R,串励直流电机正反转控制线路,QF,KM2,KM1,KT动断触头延时闭合,KM3得电,起动过程结束,KM2,KM1,KT,KM3,KM2,KM2,KM1,SB2,KM2,KM3,KM1,KM2,L+,L-,KT,KM2,SB3,KM1,SB1,KM1,KM1,R,串励直流电机正反转控制线路,QF,KM2,KM1,按下SB3,电动机停转,KM2,KM1,KT,KM3,KM2,KM2,KM1,SB2,KM2,KM3,KM1,KM2,L+,L-,KT,KM2,SB3,KM1,SB1,KM1,KM1,R,串励直流电机正反转控制线路,QF,KM2,KM1,反转控制:
6、 按下SB2,电动机串联电阻R反转起动,KT线圈失电,KM2,KM1,KT,KM3,KM2,KM2,KM1,SB2,KM2,KM3,KM1,KM2,L+,L-,KT,KM2,SB3,KM1,SB1,KM1,KM1,R,串励直流电机正反转控制线路,QF,KM2,KM1,KT动断触头延时闭合,KM3得电,起动过程结束,KM2,KM1,KT,三、制动控制线路,1. 能耗制动控制电路 串励直流电动机的能耗制动分为自励式和他励式两种。 (1)自励式能耗制动 自励式能耗制动是指当电动机断开电源 后,将励磁绕组反接并与电枢绕组和制动电阻串联构成闭合 回路,使惯性运转的电枢处于自励发电状态,产生与原方向 相反
7、的电流和电磁转矩,迫使电动机迅速停转。,KM3,KV,KM1,SB2,KM2,KM3,KM1,KM2,L+,L-,KT,KM2,SB2,KM1,SB1,KT,KM1,KM1,R,串励直流电动机自励式能耗制动控制电路,QF,KM2,KM1,电路组成分析,KM2,KM1,KM2,KM1,KV,KM2,RB,KM3,KV,KM1,SB2,KM2,KM3,KM1,KM2,L+,L-,KT,KM2,SB2,KM1,SB1,KT,KM1,KM1,R,串励直流电动机自励式能耗制动控制电路,QF,KM2,KM1,合上电源开关QF,KM2,KM1,KM2,KM1,KV,KM2,RB,KM3,KV,KM1,SB2
8、,KM2,KM3,KM1,KM2,L+,L-,KT,KM2,SB2,KM1,SB1,KT,KM1,KM1,R,串励直流电动机自励式能耗制动控制电路,QF,KM2,KM1,起动控制: 按下SB1,电动机串联电阻R起动,KT线圈失电,KM2,KM1,KM2,KM1,KV,KM2,RB,KM3,KV,KM1,SB2,KM2,KM3,KM1,KM2,L+,L-,KT,KM2,SB2,KM1,SB1,KT,KM1,KM1,R,串励直流电动机自励式能耗制动控制电路,QF,KM2,KM1,KT动断触头延时闭合,KM3得电,起动过程结束,KM2,KM1,KM2,KM1,KV,KM2,RB,KM3,KV,KM1
9、,SB2,KM2,KM3,KM1,KM2,L+,L-,KT,KM2,SB2,KM1,SB1,KT,KM1,KM1,R,串励直流电动机自励式能耗制动控制电路,QF,KM2,KM1,按下SB2,KM1失电,能耗制动开始,KM2,KM1,KM2,KM1,KV,KM2,RB,KM3,KV,KM1,SB2,KM2,KM3,KM1,KM2,L+,L-,KT,KM2,SB2,KM1,SB1,KT,KM1,KM1,R,串励直流电动机自励式能耗制动控制电路,QF,KM2,KM1,当速度降低到较低时,KV释放,各电器触头复位,制动结束。,KM2,KM1,KM2,KM1,KV,KM2,RB,(2)他励式能耗制动 制
10、动时,切断电动机电源,将电枢绕组与放电电阻R1接通,将励磁绕组与电枢绕组断开后串入分 压电阻R2,再接入外加直流电源励磁。,KM1,SB2,KM1,KM2,L+,L-,KM2,SB1,SQ2,R3,QF,KM2,KM1,电路组成分析,KM2,KM1,KM2,KM1,SQ1,R,R1,R2,串励直流电动机(作伺服电动机)他励式能耗制动控制电路,KM1,SB2,KM1,KM2,L+,L-,KM2,SB1,SQ2,R3,串励直流电动机(作伺服电动机)他励式能耗制动控制电路,QF,KM2,KM1,合上电源开关QF,KM2,KM1,KM2,KM1,SQ1,R,R1,R2,KM1,SB2,KM1,KM2,
11、L+,L-,KM2,SB1,SQ2,R3,串励直流电动机(作伺服电动机)他励式能耗制动控制电路,QF,KM2,KM1,按下SB1,KM2,KM1,KM2,KM1,SQ1,R,R1,R2,KM1,SB2,KM1,KM2,L+,L-,KM2,SB1,SQ2,R3,串励直流电动机(作伺服电动机)他励式能耗制动控制电路,QF,KM2,KM1,松开SB1,KM2,KM1,KM2,KM1,SQ1,R,R1,R2,KM1,SB2,KM1,KM2,L+,L-,KM2,SB1,SQ2,R3,串励直流电动机(作伺服电动机)他励式能耗制动控制电路,QF,KM2,KM1,按下SB2,KM2,KM1,KM2,KM1,S
12、Q1,R,R1,R2,2.串励直流电动机反接制动控制电路,(1)位能负载时转速反向法 这种方法就是强迫电动机的转速反向,使电动机的转速方向与电磁转矩的方向相反,以实现制动。,KM1,KM,L+,L-,RB,QF,KM2,电路组成分析,R1,R2,(2)电枢直接反接法,KM1,KM2,KM3,KM4,KM5,KV,KT2,KT1,KA2,KA1,KV,KA,AC前 后,KA,I,KT2,KT1,KM3,KM4,KM5,KA2,KA1,KM2,KM2,KM1,KM1,KM,KM,KM1,KM,L+,L-,RB,QF,KM2,合上电源开关QF AC手柄置“0”位置,R1,R2,KM1,KM2,KM3
13、,KM4,KM5,KV,KT2,KT1,KA2,KA1,KV,KA,AC前 后,KA,I,KT2,KT1,KM3,KM4,KM5,KA2,KA1,KM2,KM2,KM1,KM1,KM,KM,KM1,KM,L+,L-,RB,QF,KM2,电动机正转: AC手柄置“前”位置,KM,KM1线圈得电动作,电动机串联电阻起动,R1,R2,KM1,KM2,KM3,KM4,KM5,KV,KT2,KT1,KA2,KA1,KV,KA,AC前 后,KA,I,KT2,KT1,KM3,KM4,KM5,KA2,KA1,KM2,KM2,KM1,KM1,KM,KM,KM1,KM,L+,L-,RB,QF,KM2,KM1动合辅
14、助触头闭合,KA1线圈得电电阻RB被除数短路,R1,R2,KM1,KM2,KM3,KM4,KM5,KV,KT2,KT1,KA2,KA1,KV,KA,AC前 后,KA,I,KT2,KT1,KM3,KM4,KM5,KA2,KA1,KM2,KM2,KM1,KM1,KM,KM,KM1,KM,L+,L-,RB,QF,KM2,KT1线圈失电其动断触头延时闭合,KM4线圈得电,R1,R2,KM1,KM2,KM3,KM4,KM5,KV,KT2,KT1,KA2,KA1,KV,KA,AC前 后,KA,I,KT2,KT1,KM3,KM4,KM5,KA2,KA1,KM2,KM2,KM1,KM1,KM,KM,KM1,KM,L+,L-,RB,QF,KM2,KT2线圈失电其动断触头延时闭合,KM5线圈得电 电动机起动完毕,正常运行,R1,R2,KM1,KM2,KM3,KM4,KM5,KV,KT2,KT1,KA2,KA1,KV,KA,AC前
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