Originally Posted by
Roelof
I do not think an IR meter does give a right indication about the generated magnetism. Yes, the PWM frequency determines the induction resistance and with that the drawn current. And the amount of current does determine the strength of the magnetic field. But again, the shape and used metals of the stator will have an effect on the magnetic field as well.
They will, but so will that have an effect of the field outside of the can. It isn't a guarantee that a higher reading at the can is really a stronger field. Most of the field is retained in the core... To test I just spun up a motor putting a hall sensor right by the can, it was negligible.
So what is really needed then would be the ability to measure the field inside the motor, but where exactly? Where can you fit a hall sensor in the motor for testing? Maybe something in the shape of a rotor with sensors in it, that is inserted for the reading while electrolyzing the coils with a low current.