MPL-B880C-SJ72AA

當本相電流不平衡時，首先應檢查電源電壓的平衡情況，檢查繞組是否有相間、匝間或對地短路故障，而后檢查繞組的接線符合性：

——各相繞組的首尾端是否有接錯的問題；

——各個線圈或極相組的極性是否接反；

——每極每相槽數是否相等或按規律分組；

——有沒有線圈漏接、斷線或焊接不良，以及一相繞組接到另一相的情況。

如果某相繞組個別極相組或線圈是否接反，可將低壓直流電（電流大小只要能使指南針產生偏轉就行）通入某相繞組，用指南針沿鐵心圓周逐槽檢查，如果在每個極相組上指南針的指示方向依次改變，改變次數等于電機極數，則表示接線正確，反之，則表明某極相組接線有問題。如果在同一極相組的鄰近幾槽，指南針的方向也改變，說明該極相組個別線圈嵌反。

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