Patent ID: 8847460
Filing Date: 2014-09-30
Classification: H02K

Abstract:
1. A permanent magnet motor, comprising: a permanent magnet rotor mounted on a shaft having a center line defining a longitudinal axis, said rotor including an outer surface co-axial with said longitudinal axis; a stator surrounding the rotor, said stator comprising a plurality of teeth radially inwardly oriented toward the longitudinal axis, each tooth having a tooth length and a tooth tip surface geometry, wherein the plurality of teeth are distributed in a preferred asymmetric circumferential pattern with respect to an ideal inside radius of the stator based on variations in both the tooth length and the tooth tip surface geometry of each tooth, and wherein the preferred asymmetric circumferential pattern is selected using a model simulating operation of the permanent magnet motor based upon: an asymmetric air gap defined by a radial distance between the outer surface of the rotor and a radially inward inner surface portion of each tooth tip surface geometry, said radial distance having an asymmetric variation between minimum and maximum magnitudes based on the preferred asymmetric circumferential pattern of teeth.