一台绕线转子感应电动机,已知P N =75kW,U N1 =380V,n N =720r/min,I N1 =148A,η N =90.5%,cosΦ N1 =0.85,λ m =2.4,E N2 =213V,I N2 =220A,带动一位能负载,T z =T N ,采用倒拉反接自动下放负载,要求下放转运为300r/min,试问转子每相应串联多大电阻?
【简答题】用括号内所给单词的适当形式填空。 1. Your friends would probably say you are a good _____ (listen). 2. I find it very _____ (help) to get a first-aid book at hand. 3. He is very _____ (confidence) and he believes he c...