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1,三相交流异步电动机控制系统中常用的保护环节有哪些?短路保护,过载保护,零压和欠压保护,过电流保护,断相保护。2,电气控制系统图分哪几类?电气控制系统图分为:电气原理图、电气元件布置图和电气安装接线图三类。3.简述三相异步电机能耗制动的原理及特点。能耗制动的原理:在电动机脱离三相交流电源后,向定子绕组内通入直流电源,建立静止磁场,转子以惯性旋转,转子导体切割定子恒定磁场产生转子感应电动势,从而产生感应电流,... 2024-11-021315.32 KB6页16
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