【单选题】【消耗次数:1】
下列()不属于异步电动机的调速方式。
变压调速
变转差率调速
变频调速
变极调速
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①  正确
②  错误
【单选题】 下列异步电动机调速方法属于转差功率消耗型的调速系统是 ()。
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②  串级调速
③  变极调速
④  变压变频调速
【单选题】 下列异步电动机调速方法属于转差功率不变型的调速系统是
①  A.降电压调速
②  B.串级调速
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①  变极调速
②  变频调速
③  变转差率调速
④  变电流调速
【单选题】 下列交流异步电动机的调速方法中,应用最广的是
①  A.降电压调速
②  B.变极对数调速
③  C.变压变频调速
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③  改变电压的相位
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①  正确
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