[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$frWnfTWlh9JgWdlVnHUJnblqTlisWPe6YF8xcNXhoh-Q":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":8,"question":12,"related":13,"source":24,"type":88},[],"2023-10-12 17:07:35",99261561,[],{"courseId":9,"courseImg":10,"courseName":11},"70c4f46004b45a008c55238b84408919","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fa88548c67a838814120765ff5a0261db.jpg","机电传动控制","电压与欠电压保护和弱励磁保护.他励直流电动机的工作状态,电动机发出的T和n方向相同 ,(填写 电动状态,发电状态)",[14,26,35,40,49,59,67,76,85,89],{"answer":15,"createTime":16,"id":17,"options":18,"question":23,"source":24,"type":25},[],"2023-10-12 17:07:34",99261544,[19,20,21,22],"调压调速","串电阻调速","弱磁调速","A和B","_________的调速方式可以实现对恒转矩型负载的无极调速","v1",0,{"answer":27,"createTime":16,"id":28,"options":29,"question":34,"source":24,"type":25},[],99261545,[30,31,32,33],"Ke","Φ","Ia","U","直流电动机调速系统,若想采用恒功率调速,则可改变_________",{"answer":36,"createTime":5,"id":37,"options":38,"question":39,"source":24,"type":25},[],99261546,[30,31,32,33],"直流电动机调速系统,若想采用恒转矩调速,则可改变_________",{"answer":41,"createTime":5,"id":42,"options":43,"question":48,"source":24,"type":25},[],99261547,[44,45,46,47],"只能在n0以下无级调速","机械特性变硬,调速范围不大","轻载时产生飞车事故","都不对","直流他励电动机的调速特性,改变主磁通φ,下列说法正确的是",{"answer":50,"createTime":5,"id":51,"options":52,"question":57,"source":24,"type":58},[],99261549,[53,54,55,56],"改变电枢电路串接电阻","改变电动机电枢供电电压","改变电动机主磁通","以上都不是","下列属于他励直流电动机调速方法的是",1,{"answer":60,"createTime":5,"id":61,"options":62,"question":66,"source":24,"type":58},[],99261551,[63,64,65,56],"反馈制动","反接制动","能耗制动","属于他励直流电动机的制动方法是",{"answer":68,"createTime":5,"id":69,"options":70,"question":75,"source":24,"type":58},[],99261553,[71,72,73,74],"机械特性变软,稳定性差","轻载时调速范围不大","无级调速困难;电阻上消耗大量电能","启动电阻不能用来调速","他励直流电动机电枢电路外串电阻调速,正确的是",{"answer":77,"createTime":5,"id":78,"options":79,"question":84,"source":24,"type":58},[],99261557,[80,81,82,83],"连续平滑调速,在nN以下调速","机械特性硬度不变","调速时电流不变,转矩不变,恒转矩调速","利用降压启动电机而不用其他设备","他励直流电动机改变电压调速有以下特点",{"answer":86,"createTime":5,"id":6,"options":87,"question":12,"source":24,"type":88},[],[],2,{"answer":90,"createTime":5,"id":91,"options":92,"question":95,"source":24,"type":96},[],99261563,[93,94],"正确","错误","电动机的调速即由于电动机负载转矩发生变化(增大或减小),而引起的电动机转速变化(下降或上升)",3]