Patent ID: 8957563
Filing Date: 2015-02-17
Classification: H02K

Abstract:
1. An electric machine comprising: a rotor configured to be rotatable within a stator; a first tooth disposed along an outer perimeter of the rotor, the first tooth defining a first outer edge extending between a first tooth base and a first tooth tip; a second tooth disposed along the outer perimeter of the rotor, the second tooth defining a second outer edge extending between a second tooth base and a second tooth tip; a first slot provided in the rotor and at least partially defined by the first and the second tooth; wherein an arc radius from an origin to the outer perimeter of the rotor varies along the first outer edge, thereby creating a first non-uniform gap between the rotor and the stator; wherein the arc radius from the origin to the outer perimeter of the rotor varies along the second outer edge, thereby creating a second non-uniform gap between the rotor and the stator; a first slot central axis defined by the first slot; and a first slot opening defined by a space between the first and the second tooth tip and having a first slot opening central axis, the first slot opening central axis being offset from the first slot central axis.