Originally Posted by
trilerian
Lower IR in the stator coils will energize the stator faster and allow more current in rush this will create a stronger magnetic field. We already have the tools to measure IR, and it is going to be a much more reliable measurement technique. Something like the VICI 480c+ is on the cheaper side, especially from Ali and while its accuracy is not perfect it is repeatable. One of the big factors for measuring IR however is the temperature of the stator. Copper temp coefficient is awful, for a 17.5 or 21.5 for every change in 1 degree °C equals about a 0.1mΩ change in resistance.
But the amount of metal, the kind of metal, the volume (dimensions), slots etc of the stator has an influence on the generated magnetic field and I think the frequency has also some influence.