造成电机三相电流不平衡的原因可能有以下几个方面。

一、三相电源不平衡，此时要测量三相电源的电压，若存在电压不平衡情况及时调整。

二、定子绕组中部分线圈断路，此时要测量线圈中的电流是否存在短路现象。

三、电机修理后，部分线圈的匝数错误，此时可以用双臂电桥测量各线圈绕组的直流电阻。

The reasons for the unbalanced three-phase current of the motor may be as follows.

1. The three-phase power supply is unbalanced. At this time, the voltage of the three-phase power supply must be measured. If there is a voltage imbalance, adjust it in time.

2. Some coils in the stator winding are disconnected. At this time, it is necessary to measure whether there is a short circuit in the current in the coil.

3. After the motor is repaired, the number of turns of some coils is wrong. At this time, you can use a double-arm bridge to measure the DC resistance of each coil winding.