低压电器及其控制技术课程设计报告

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1、低压电器及其控制技术低压电器及其控制技术课程设计报告姓名：班级：学号：指导教师：12低压电器及其控制技术目录课程设计目的······················································································3课程设计时间······················································································3课程设计内容···········

2、···········································································3第1题···································································································4第2题···········································································

3、························5第3题··································································································7第4题··································································································8第5题·························

4、·······································································10课程设计收获····················································································1112低压电器及其控制技术一、课程设计目的：根据专业教学计划与教学大纲的规定，本课程应有一周的课程设计。通过一定的课题，巩固本课程的基础知识。提高运算、查阅资料、制图和设计的独立工作能力

5、。二、课程设计时间：三、课程设计内容：独立设计出符合下面5题要求的控制电路，并用CAD软件绘制出图纸，最后写出设计的报告书。12低压电器及其控制技术第一题：12低压电器及其控制技术第二题：分析具有反接制动电阻的可逆运行反接制动控制线路的控制原理。(1)反向运行时按下停止按钮时的电气控制逻辑顺序:串R反接制动反向运行时，KM1触点断开，KM2、KM3触点闭合，此时按下停止按钮，反向12低压电器及其控制技术停车制动工作过程如下：n<90r/min按下SB1→KA4失电，触点动作；KM2失电，触点动作转速下降KS2

6、触点断开→KA2线圈失电，触点动作电动机停机（2）正向运行时反向启动的电气控制逻辑顺序：正向运行时，KM1、KM3触点闭合，KM2触点断开n>120r/min按下SB3→KA4线圈得电，触点动作；KA3线圈失电，触点动作→KM1线圈失电，触点动作；KM3线圈失电，触点动作；KM2线圈得电，触点动作→电动机串R反向运行继电器KS2触点动作→KA2线圈得电，触点动作→KM3线圈得电，触点动作→短接电阻R，电动机转速上升至反向稳定转速第三题：设计一个控制电路，三台异步电动机起动时，M1先起动，经过15S后，M2自行

7、起动，运行15S后，M1停止并同时使M3自行起动，再运行15S后，电动机全部停止1、主电机电路及控制电路如下图所示：12低压电器及其控制技术15s延时2、控制运行过程如下：15s延时合QF→按下SB2→KM1线圈得电，自锁运行→KT1得电，开始计时KT1触点动作→KM2自锁运行，触点动作→KT1失电，KT2得电，开始计时15s延时KT2触点动作→KM1失电，M1停转，KM3自锁运行，触点动作→KT2失电,KT3得电，开始计时KT3触点动作→M1、M2、M3停转第四题：设计一小车运行的控制电路，小车由异步电动机

8、拖动，其动作顺序如下：（1）小车由原位开始前进，到终端后自动停止。（2）在终端停留2min后自动返回原位停上。（3）要求在前进或后退途中任意位置都能停止或再次起动。1、主电机电路及其控制电路如下图所示：12低压电器及其控制技术1、控制运行过程如下：12低压电器及其控制技术小车右移碰到SQ1合下QF→按下SB2→KM1自锁运行，电机正转，小车右移→到达终端2min延时后小车碰到SQ2SQ1常闭触点断开