Electric hoist motors appear unbalanced three-phase power causes

  Most electric hoist three-phase voltage is used,chain Block but the process of using some of the fault is due to current imbalance caused, then the motor appears unbalanced three-phase power What is the reason, how should we avoid such failure causes electric hoist it ?
       When the basic symmetrical three-phase power, the asynchronous motor at the rated voltage of the three-phase load current, any one phase and the average deviation of not greater than the average of 10%. Therefore, only the three-phase voltage imbalance is too large, or electric  lift hoist  motor itself in case there is a fault, the motor phase current imbalance will appear.load chain The possible reasons are:
       1, three-phase power supply voltage unbalance caused by electric hoist motor phase current imbalance.
       2, the motor windings shorted.
       3, the inner part of the stator winding coil reversed.
       4, the three-phase windings of the motor are not equal.
       5, the winding circuit.