Originally Posted by
Roelof
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.
For frequency response and overall make of the stator I would use an LCR meter to measure the inductance. DE-5000 is a pretty darn good one that can do a limited range of frequencies (1kHz and 10Khz are usable by our application), also it can measure IR of the stator as well.
Generally, a lower frequency means a higher inductance, higher inductance without increasing IR generally leads to more torque.
Fantom also has a product that can measure IR and inductance. I have never used it, but I know it is out there.