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并励直流电动机的基本控制线路.ppt

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并励直流电动机的基本控制线路.ppt
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课题十 并励直流电动机的基本控制线路,,,直流电动机具有启动转矩大、调速范围广、调速精度高、能够实现无级平滑调速以及可以频繁启动等一系列优点。,高精度切削机床 轧钢机,造纸机 龙门刨床,外型图 内部接线图,一、启动控制线路,1.手动启动控制线路,BQ3直流电动机启动变阻器外形图 并励直流电动机手动启动控制电路图0~5-分段静触头 6-电磁铁 7- 弧形铜条,QF,KT1,KT1,KM1,KM2,,,,,,,L+,KM2,,,,L,,,,,,,,,,,KM1,,,,,,,,SB2,KA1,,,,,,,,,,,,,,,,KA2,SB1,KA2,KA1,,,,,,,,,,,,,,,I,,KM1,KM1,KM3,R2,,,KM1,2.电枢回路串电阻二级启动控制线路,,,,,,,,,,,,,,,,,,,,,,,I,,,,,,,,M,R1,KM1,,,,KT2,,,,,,,,KM3,,电路分析,,KT2,QF,KT1,KT1,KM1,KM2,,,,,,,L+,KM2,,,,L,,,,,,,,,,,KM1,,,,,,,,SB2,KA1,,,,,,,,,,,,,,,,KA2,SB1,KA2,KA1,,,,,,,,,,,,,,,I,,KM1,KM1,KM3,R2,,,KM1,,,,,,,,,,,,,,,,,,,,,,,I,,,,,,,,M,R1,KM1,,,,KT2,,,,,,,KM3,,合上电源开关QS, 励磁绕组得电, KA1线圈得电,KT1,KT2线圈得电,,,,,,,KT2,2.电枢回路串电阻二级启动控制线路,QF,KT1,KT1,KM1,KM2,,,,,,,L+,KM2,,,,L,,,,,,,,,,,KM1,,,,,,,,SB2,,,,,KA1,,,,,,,,,,,,,,,,KA2,SB1,KA2,KA1,,,,,,,,,,,,,,,I,,KM1,KM1,KM3,R2,,,KM1,,,,,,,,,,,,,,,,,,,,,,,I,,,,,,,,M,R1,KM1,,,,KT2,,,,,,,KM3,,启动: 按下SB1 KM1线圈得电, KM1触头闭合, 电动机串联电阻启动, KM1动断触头断开,KT1,KT2线圈失电,,,,,,,KT2,,,2.电枢回路串电阻二级启动控制线路,QF,KT1,KT1,KM1,KM2,,,,,,,L+,KM2,,,,L,,,,,,,,,,,KM1,,,,,,,,SB2,,,,,KA1,,,,,,,,,,,,,,,,KA2,SB1,KA2,KA1,,,,,,,,,,,,,,,I,,KM1,KM1,KM3,R2,,,KM1,,,,,,,,,,,,,,,,,,,,,,,I,,,,,M,R1,KM1,,,,KT2,,,,,,,KM3,,继续启动: KT1经过整定时间, KT1动断触头延时闭合, KM2线圈得电 KM2触头闭合, 电动机串联R2继续启动,,,,,,,KT2,,,,,,,,2.电枢回路串电阻二级启动控制线路,QF,KT1,KT1,KM1,KM2,,,,,,,L+,KM2,,,,L,,,,,,,,,,,KM1,,,,,,,,SB2,,,,,KA1,,,,,,,,,,,,,,,,KA2,SB1,KA2,KA1,,,,,,,,,,,,,,I,,KM1,KM1,KM3,R2,,,KM1,,,,,,,,,,,,,,,,,,,,,,,I,,,,,M,R1,KM1,,,,KT2,,,,,,,KM3,,KT2经过整定时间 KT2动断触头延时闭合, KM3线圈得电 KM3触头闭合 切除全部电阻 电动机全速运行,,,,,,,KT2,,,,,,,,,2.电枢回路串电阻二级启动控制线路,二、正反转控制线路,直流电动机实现正反转有电枢绕组反接 法和励磁绕组反接法两种。,KM3,KM2,KM2,KM1,SB2,KM2,KM3,KM1,KM2,KA,,,L+,L-,,,,,,,,,,,,,,KT,,,,,,,,,KA,KM2,SB3,KM1,SB1,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,KT,KM1,,,,,,,,,,,,,,KM1,,,,,,,,,,,,,,,,,,,,,,,,R,并励直流电机正反转控制线路,,,,,,I<,,QF,,,,,,,KM2,KM1,电路分析,KM2,KM1,KM3,KM2,KM2,KM1,SB2,KM2,,,,,,,,,,,,,,,,,,,,,,,,KA,KM2,SB3,KM1,SB1,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,KT,KM1,,,,,,,,,,,KM1,,,,,,,,,,,,,,,,,,,,,,,,R,并励直流电
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