发布时间:2025-02-01 16:20:17
【答案】:三相交流异步电动机的调速方法有三种:(1)变极调速:改变定子绕组磁极数;(2)变频调速,改变电动机电源频率;(3)改变电动机转差率调速;改变串接在转子电路内的电阻(此种方法适用于三相绕线式电动机使用)。
想用3x4的铁方管焊个框架再上细木工板做个柜子方管和板材怎样连接固定
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