Fractional-slot winding motor

摘要

A brushless electric motor (36) is disclosed. In an exemplary embodiment of the invention, the motor (36) includes a permanent magnet rotor (60) having a plurality of magnetic poles (64) thereupon and a stator (66). The stator (66) further includes a plurality of stacked laminations (68) defining a plurality of slots (70) therein, and a plurality of fractional-pitch phase windings disposed within the plurality of slots (70). The motor (36) has a non-integer slots-per-pole ratio, and a magnitude of 5 and 7 harmonic components of a fundamental frequency component of the motor are less than 0.3% and 0.1% of a magnitude of the fundamental frequency component, respectively.