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鼠笼式电机通过改变极数的方法可以获得高低两档工作速度和一档慢就位速度，基本上可满足塔吊租赁塔吊的调速要求，使机构简化，但换挡时冲击较大，调速范围为1：8左右，且不能较长时间低速运行。主要用于40t.m以下的轻小型塔吊。变极调速还可加上电磁换挡减速器可使调速档数增加一倍，这种调速主要在起重能力450-900kN.m的塔吊上应用日趋普及。【具体可参考《如何防止钢丝绳过载？塔吊租赁公司建议你这样做》的相关内容】

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