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FBM211电缆P0916FJ
铸铝转子质量的好坏直接影响异步电动机的技术经济指标和运行性能,在研究铸铝转子质量问题时,不仅要分析转子的铸造缺陷,而且应该了解铸铝转子质量对电机的效率、功率因数以及启动、运行性能的影响。
铸铝方法与转子质量的关系
铸铝转子比铜条转子异步电机的附加损耗大得多,采用的铸铝方法不同。附加损耗也不同,其中压力铸铝转子电机附加损耗大。
这是因为压铸时强大的压力使笼条和铁心接触得十分紧密,甚至铝水挤入了叠片之间,横向电流增大,使电机的附加损耗大增加。
此外,压铸时由于加压速度快,压力大,型腔内的空气不能完全排除,大量气体呈“针孔”装密布于转子笼条、端环、风叶等处,致使铸铝转子中铝的比重减小(约比离心铸铝减少8%)平均电阻增加13%,这样使电机的主要技术经济指标大大下降,离心铸铝转子虽然受各种因素影响,容易产生缺陷,但电机的附加损耗小。
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