VERTEQ 1085566-1 Overspeed PCB--not in original packaging采用效率高、發熱少的磁同步電動機可以降低溫升。但全封閉牽引電動機是電機整體溫度升高，而軸承部分的溫升限值較低，因此必須防止該部分溫升過高。為此，我們軸承周圍的冷卻結構進行了研究，試制了采用新軸承冷卻結構的全封閉磁同步電動機（），軸承冷卻結構的效果和降噪效果進行了試驗認。
全封閉牽引電動機樣機縱剖面圖結果表明，在與以往自通風異步牽引電動機相同的體積下，可以實現同樣功率的全封閉牽引電動機，高速運轉時全封閉電機的噪聲比往降低0dB左右。而且，這種全封閉牽引電動機與以前的電動機相比，輕量化和高效率同時得到了滿足。
4磁同步電動機的有關問題4.空載感應電壓即使外部不供給電源，磁同步電動機的久磁鐵也能使定子線圈產生交鏈磁通，惰性時牽引電動機端子上也能產生電壓。這種電壓被稱為空載感應電壓。由通常的電壓型逆變器驅動磁同步電動磁同步電動機在鐵道機車動車上的應用變流技術與電力牽引/2003機時，空載感應電壓可能會帶來以下問題逆變器出現相間短路等故障時，電動機向故障點供電，產生短路電流，可能會擴大故障影響；）空載感應電壓的峰值若超過逆變器材元件的耐壓就會損壞元件；）如果空載感應電壓的峰值高于逆變器直流側電壓，則惰行時因與逆變器開關元件反并聯的二管起整流回路的作用，就會產生再生制動。教學設計以解決實際的教學問題為宗旨，是連接教學理論與教學實踐的橋梁。
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