(课件网) 掌握串励直流电动机基本控制线路的构成和工作原理，能完成安装与检修。 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 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 一、启动控制线路 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 QF KT1 KT1 KM1 KM2 L+ KM2 L SB2 SB1 KM1 KM1 KM3 R2 M R1 KM1 KT2 KM3 KT2 合上电源开关QF 2.自动启动控制线路 KT1 KT1 KM1 KM2 L+ KM2 L SB2 SB1 KM1 KM1 KM3 R2 M R1 KM1 KT2 KM3 KT2 按下SB1 KM1线圈得电 QF 2.自动启动控制线路 KT1 KT1 KM1 KM2 L+ KM2 L SB2 SB1 KM1 KM1 KM3 R2 M R1 KM1 KT2 KM3 KT2 KT1经过整定时间 KT1动断触头延时闭合 2.自动启动控制线路 QF QF KT2经过整定时间 KT2动断触头延时闭合 进入正常工作 KT1 KT1 KM1 KM2 L+ KM2 L SB2 SB1 KM1 KM1 KM3 R2 M R1 KM1 KT2 KM3 KT2 2.自动启动控制线路 按下SB1， 电动机停转 KT1 KT1 KM1 KM2 L+ KM2 L SB2 SB1 KM1 KM1 KM3 R2 M R1 KM1 KT2 KM3 KT2 2.自动启动控制线路 QF 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。 二、正反转控制线路 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 M KM3 KM2 KM2 KM1 SB2 KM2 KM3 KM1 KM2 L+ L- KT KM2 SB3 KM1 SB1 KM1 KM1 R QF KM2 KM1 合上电源开关QF KM2 KM1 M KT KM3 KM2 KM2 KM1 SB2 KM2 KM3 KM1 KM2 L+ L- KT KM2 SB3 KM1 SB1 KM1 KM1 R 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 M KT KM3 KM2 KM2 KM1 SB2 KM2 KM3 KM1 KM2 L+ L- KT KM2 SB3 KM1 SB1 KM1 KM1 R QF KM2 KM1 KT动断触头延时闭合，KM3得电，起动过程结束 KM2 KM1 M KT KM3 KM2 KM2 KM1 SB2 KM2 KM3 KM1 KM2 L+ L- KT KM2 SB3 KM1 SB1 KM1 KM1 R QF KM2 KM1 按下SB3，电动机停转 KM2 KM1 M KT KM3 KM2 KM2 KM1 SB2 KM2 KM3 KM1 KM2 L+ L- KT KM2 SB3 KM1 SB1 KM1 KM1 R QF KM2 KM1 反转控制： 按下SB2，电动机串联电阻R反转起动，KT线圈失电 KM2 KM1 M KT KM3 KM2 KM2 KM1 SB2 KM2 KM3 KM1 KM2 L+ L- KT KM2 SB3 KM1 SB1 KM1 KM1 R QF KM2 KM1 KT动断触头延时闭合，KM3得电，起动过程结束 KM2 KM1 M KT 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，产生与原方向相反的电流和电磁转矩，迫使电动机迅速停转。 三、制动控制线路 KM3 KV KM1 SB2 KM2 KM3 KM1 KM2 L+ L- KT KM2 SB2 KM1 SB1 KT KM1 KM1 R QF KM2 KM1 电路组成分析 KM2 KM1 M KM2 KM1 KV KM2 RB KM3 KV KM1 SB2 KM2 KM3 KM1 KM2 L+ L- KT KM2 SB2 KM1 SB1 KT KM1 KM1 R KM2 KM1 合上电源开关QF KM2 KM1 M KM2 KM1 KV KM2 RB QF KM3 KV KM1 SB2 KM2 KM3 KM1 KM2 L+ L- KT KM2 SB2 KM1 SB1 KT KM1 KM1 R 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 M KM2 KM1 KV KM2 RB QF KM3 KV KM1 SB2 KM2 KM3 KM1 KM2 L+ L- KT KM2 SB2 KM1 SB1 KT KM1 KM1 R KM2 KM1 KT动断触头延时闭合，KM3得电，起动过程结束 KM2 KM1 M KM2 KM1 KV KM2 RB QF KM3 KV KM1 SB2 KM2 KM3 KM1 KM2 L+ L- KT KM2 SB2 KM1 SB1 KT KM1 KM1 R KM2 KM1 按下SB2，KM1失电，能 ... ...
