FBM211電纜P0916FJ

鑄鋁轉(zhuǎn)子質(zhì)量的好壞直接影響異步電動(dòng)機(jī)的技術(shù)經(jīng)濟(jì)指標(biāo)和運(yùn)行性能，在研究鑄鋁轉(zhuǎn)子質(zhì)量問(wèn)題時(shí)，不僅要分析轉(zhuǎn)子的鑄造缺陷，而且應(yīng)該了解鑄鋁轉(zhuǎn)子質(zhì)量對(duì)電機(jī)的效率、功率因數(shù)以及啟動(dòng)、運(yùn)行性能的影響。

鑄鋁方法與轉(zhuǎn)子質(zhì)量的關(guān)系

鑄鋁轉(zhuǎn)子比銅條轉(zhuǎn)子異步電機(jī)的附加損耗大得多，采用的鑄鋁方法不同。附加損耗也不同，其中壓力鑄鋁轉(zhuǎn)子電機(jī)附加損耗大。

這是因?yàn)閴鸿T時(shí)強(qiáng)大的壓力使籠條和鐵心接觸得十分緊密，甚至鋁水?dāng)D入了疊片之間，橫向電流增大，使電機(jī)的附加損耗大增加。

此外，壓鑄時(shí)由于加壓速度快，壓力大，型腔內(nèi)的空氣不能完全排除，大量氣體呈“針孔”裝密布于轉(zhuǎn)子籠條、端環(huán)、風(fēng)葉等處，致使鑄鋁轉(zhuǎn)子中鋁的比重減小（約比離心鑄鋁減少8%）平均電阻增加13%，這樣使電機(jī)的主要技術(shù)經(jīng)濟(jì)指標(biāo)大大下降，離心鑄鋁轉(zhuǎn)子雖然受各種因素影響，容易產(chǎn)生缺陷，但電機(jī)的附加損耗小。

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