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Abstract：
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this paper discusses the drive efficiency when induction motor working in different ratio of rotation difference. In this paper, we also analyze the heating problem of motor loop and point out that the heating is mainly caused by the large change of ratio of rotation difference. Based on this discussion, we draw a conclusion that the drive efficiency of the electric screw presses is not higher than the friction screw presses. The conclusion is useful for the design and manufacture of screw presses.
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AuthorIntro：
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Reference：
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1 李隆年,王宝玲,周汝潢电机设计北京:清华大学出版社,1992
2 汤晓燕启动时感应电动机的瞬态电流和电磁转矩电机与控制学报,2001,5(4):220～224
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