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The cause of excessive load current(1) the air gap between the stator and rotor exceeds the specified value; (2) the motor rotor axial displacement of rotor end; refers to shrink to the stator core, the flux increases in reluctance ends meet, resulting in the no-load current is too large. (3) ball bearing wear and shaft bending caused by stator, rotor rub. Although the Department at the motor no-load, such as load, so that the no-load current is too large. (4) each phase winding is not enough. |