濟南電機維修 http://m.jzap.cn/專家，告訴你迅速判斷電機好壞的方法。
1.用萬用表測量電機三相繞組的直流電阻，三次測量的結果越接近越好，在2%以內繞組電阻合格，相差10%以上時，電阻小的一相可能發生了匝間短路。
1.The DC resistance of the three-phase winding of the motor is measured by the universal meter. The result of the three measurement is close to the better, and the winding resistance of the 2% is qualified, the resistance is small, and a phase of the turn to turn short circuit can occur when the resistance is less than 10%.
2.用500v絕緣搖表測量三相繞組相間絕緣電阻和對地（對機殼）絕緣電阻，長期存放的電機各項絕緣電阻要0.5兆歐以上為好電機，可以使用。0.1兆歐以上不足0.5兆歐說明電機已經受潮，要烘干處理后才可以使用。絕緣電阻很低的說明絕緣已經損壞。
2.The insulation resistance of the three-phase windings and the insulation resistance of the ground (on the casing) are measured by the 500V insulation shake table, and the insulation resistance of the motor is 0.5, which is better than MB for a long time. 0.1 less than 0.5 MB of Europe that the motor has been affected with damp, to dry before you can use. The insulation resistance is very low, which indicates that the insulation is damaged.
3.轉動電機轉子，應該輕松自如，并且沒有雜音和摩擦聲，說明軸承和氣隙正常。
3.Rotary motor rotor, it should be relaxed and comfortable, and there is no noise and friction sound, bearing and air gap normal.