Motor Question

I am just curious since a permanent magnet motor is more efficient than a induction motor. If we would compare the two. What would be the current draw on both motors at no load? Assuming they are the same size and both feed for a 3 phase system.

Would their be a big difference or not?

I believe the improved efficiency is due to the PM motor having no slip. As a result, with the same electrical input, the rotor turns 1-2% faster.

There may be more to it than that but at least that much is obvious to me.

I would think that depending on rotor design there would not be a lot of difference under no load.