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當電機運行中轉(zhuǎn)速過快、過慢或不穩(wěn)時，可能是電源電壓波動過大。電刷接觸不良時，可檢查并調(diào)節(jié)刷把彈簧壓力。刷架位置不準時可進行調(diào)整。當電機起動時會出現(xiàn)轉(zhuǎn)速快、線電流大，并在電刷上出現(xiàn)較大火花。在復勵電機中串勵繞組接反時起動電流大、轉(zhuǎn)速快，可拆開重接。電樞繞組短路時，轉(zhuǎn)速快，應(yīng)迅速停車拆開檢修。電機中部分并勵繞組斷線時，勵磁電流較小，轉(zhuǎn)速快，可拆開重接。并勵繞組極性接錯時可用指南針測量磁極極性并重新接線。
