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motor radial magnetic pull

motor radial magnetic pull

motor radial magnetic pull

In the presence of a static eccentricity, there will be a pull on the rotor away from the center.  I understand there is a "dc" (constant) component and a 120hz component.  (similar to what you get when you evaluate cos^2).

Does anyone have a formula for those two force components as a function of eccentricity and number of poles?

In particular, I'm trying to understand why some people say that the pull on the rotor for given eccentricity is larger for 2-pole motor.  (I'm not talking about vibration... which is larger for 2-pole due to the more flexible mode-shape of 2-pole stator deformation.... but about the force or pull on the rotor).

(From my perspective, I would have thought that the force on a 2-pole motor would be less based on the flux pattern which flows approx 180 degrees through rotor.)

Any thoughts?

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