Okoli,

may you need to clarify your question

you need to give us more details

I could not follow, yet replying. High resistance material(Aluminium insted of cooper) of winding, would increased the cooper loss, and would reduced the efficiency of motor. As (L=do/di)vareation of flux with vareation of current, high inductance(CRGO) core insted of normal high carbon steel, would reduced the size(volume) of core for same rating motor.

I performed an offline MCE test on an electric motor using PDMA equipment.

My results show a high resistance imbalance of about 7%.

I wish to know what this means..

Thanks

Imbalance in winding resistance, could produced the the shifting of neutral point from ground zero, and the voltage unbalance, to winding. If NandG are connected, unbalance phase current would be the result.

That is correct. Larger 'Y' motors or delta windings have no reference ground. With imbalance, the windings will have a higher running temperature reducing the lifetime of their insulation. Additionally, inductance imbalance will cause phase shift away from 120°. In turn this results in non-uniform magnetic field (EMF). Over many hours of running it can lead to mechanical (bearing) wear and system vibrations.