Patent ID: 7859160
Filing Date: 2010-12-28
Classification: H02K

Abstract:
1. An electric machine comprising: a rotor, a stator having a circumference, with a predetermined plurality of slots and a predetermined plurality of teeth distributed about the circumference in alternating arrangement, wherein a shape or dimension of the teeth of at least a subset of the predetermined plurality of teeth is different from a shape or dimension of other teeth that do not belong to the subset, and a winding system having at least one winding phase arranged in the slots, wherein each winding phase comprises at least one coil group, and each coil group comprises a first single coil and at least one additional single coil, with the first single coil and the at least one additional single coil of each coil group surrounding a tooth of the subset and being electrically connected in series, and with the other teeth that do not belong to the subset lacking coils, wherein each of the at least one additional single coil of a coil group is arranged relative to a corresponding first single coil with a mechanical offset angle of: as measured in a circumferential direction of the stator, wherein n is an index common to a all single coils of a coil group, k is a coil index of the at least one additional single coil, i is a running integer indicating a position of a coil about the circumference of the stator, and p