[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$f1qTzke481uIsSv93XhOXkw5jtMcsE2Ails1bEwW_J8A":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":19,"related":20,"source":24,"type":25},[],"2023-12-19 11:39:54",116568996,[8,9,10,11],"0 ~ 10 V 交流电压信号","0 ~ 5 V 交流电压信号","0 ~ 10 V 直流电压信号","0 ~ 10 V 交直流电压信号",{"count":13,"courseId":14,"courseImg":15,"courseName":16,"workId":17,"workName":18},12,"11405febe00ad7d11237e13d7e3804b2","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F5a252d28a0855a2b845749fbf170a929.png","运动控制技术","99891785b48541ddbcbade61d1e08724","","通用变频器的模拟量给定信号有(C)及 4 ~ 20mA 电流信号等种类",[21,26,35,44,53,64,73,82,91,100],{"answer":22,"createTime":5,"id":6,"options":23,"question":19,"source":24,"type":25},[],[8,9,10,11],"v1",0,{"answer":27,"createTime":5,"id":28,"options":29,"question":34,"source":24,"type":25},[],116568999,[30,31,32,33],"输出电压U 不变","频率f不变","U\u002FF 不变","U*f 不变","变频调速过程中,为了保持磁通恒定,必须保持( )",{"answer":36,"createTime":5,"id":37,"options":38,"question":43,"source":24,"type":25},[],116569002,[39,40,41,42],"稳压电路","逆变电路","控制电路","放大电路","变频器主电路由整流及滤波电路、( )和制动单元组成",{"answer":45,"createTime":5,"id":46,"options":47,"question":52,"source":24,"type":25},[],116569007,[48,49,50,51],"直流参考信号与三角波载波信号","正弦波参与信号与三角波载波信号","正弦波参与信号与锯齿波载波信号","三角波参与信号与锯齿波载波信号","正弦波脉宽调制(SPWM),通常采用( )相交方案,来产生脉冲宽度按正弦波分布的调制波形",{"answer":54,"createTime":5,"id":55,"options":56,"question":62,"source":24,"type":63},[],116569008,[57,58,59,60,61],"主电路只有一组可控的功率环节,简化了结构","逆变器同时实现调频与调压","可获得接近于正弦波的输出电压波形,转矩脉动小","载波频率高,使电动机可实现静音运转","采用二极管整流器,提高电网功率因数","PWM 型变频器具有( )等特点",1,{"answer":65,"createTime":5,"id":66,"options":67,"question":72,"source":24,"type":63},[],116569009,[68,69,70,71],"加速时间","电子过电流保护","启动频率","矢量控制","变频器参数基本设定项包含有( )",{"answer":74,"createTime":5,"id":75,"options":76,"question":81,"source":24,"type":63},[],116569011,[77,78,79,80],"数字面板给定","模拟量给定","固定频率给定","通信给定","通用变频器的频率给定方式有( )",{"answer":83,"createTime":5,"id":84,"options":85,"question":90,"source":24,"type":63},[],116569013,[86,87,88,89],"电机的有效转矩",":电机的温升","负载的工况","电机的体积","电动机的发热主要与( )有关",{"answer":92,"createTime":93,"id":94,"options":95,"question":98,"source":24,"type":99},[],"2024-06-19 22:43:02",153462343,[96,97],"正确","错误","变频调速实际上是改变电动机内旋转磁场的速度达到改变输出转速的目的",3,{"answer":101,"createTime":102,"id":103,"options":104,"question":105,"source":24,"type":99},[],"2024-06-19 22:43:03",153462344,[96,97],"变频器的交流电源输入端子L1、L2、L3(R、S、T)接线时,应按正确相序接线,否则将影响电动机的旋转方向"]