电动机空载电流偏大可从以下几方面来检查故障原因：
1.电源电压过高。当电源电压高于额定电压时,使电机的饱和度大大增加,使激磁电流加大,同时铁心的饱和也使得电机铁耗加大。检查电源电压,若电压等级过高,则降低电压等级。电机本身气隙较大,拆开电机，用内卡、外卡测量定子内径和转子外径。
2.机定子绕组匝数未绕够。重绕定子绕组，增加匝数。
3.电机装配不当。用手试转电机，如转子转动不灵活。则可能是转子轴向位移过多。或端盖螺栓没有平衡上紧，可放松螺丝再试转。
4.电机定子绕组应该是星形的接线误接成三角形。检查定子接线与铭牌规定。
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