Patent ID: 6989622
Filing Date: 2006-01-24
Classification: H02K

Abstract:
1. An electric machine for a motor vehicle, the electric machine comprising: a claw pole rotor having a pair of opposing pole pieces sandwiching a field coil therebetween, the rotor defining an axis of rotation, each of the pole pieces having a plurality of circumferentially spaced pole fingers extending axially, the pole fingers of the rotor alternating between north and south magnetic polarities upon energization of the field coil, adjacent pole fingers defining a distance P representing the axial distance between the magnetic centers of the adjacent pole fingers; a stator circumscribing the rotor, the stator having a stator core and a stator winding, the stator core including a lamination stack defining a plurality of stator teeth, the stator winding having a plurality of conductors positioned between the plurality of stator teeth and extending axially therethrough, the stator core defining a distance H representing the axial height of the lamination stack; and the ratio of P to H (P/H) being in the range of 0.29 to 0.45.