Patent ID: 9077230
Filing Date: 2015-07-07
Classification: H02K

Abstract:
1. An electric motor comprising: a stator comprising a stator core and stator windings; a rotor rotatably mounted in the stator and having a shaft; a heat dissipating device mounted around an outer surface of the stator core and configured to absorb heat there from, the heat dissipating device comprising a substantially cylindrical base mounted around the stator core, and a plurality of fins extending radially outwardly from an outer periphery of the base, wherein the base has a first axial end and a second axial end opposite to the first axial end, the base has an opening at the second axial end, and the plurality of fins define a plurality of air passages extending from positions adjacent to the first axial end towards the second axial end of the base; a circuit board located at the opening of the base, the circuit board having a through hole at a central portion thereof; an end cap located at an outer side of the circuit board such that the circuit board is located between the end cap and the stator, the end cap fixed to the stator and having a bearing supporting the shaft of the rotor; at least one electronic component mounted to a radially outer surface of the base of the heat dissipating device adjacent to the second axial end of the base, and aligned to at least one air passage of the heat dissipating device in an axial direction of the stator; and a fan mounted on the shaft and arranged to generate a flow of air through an interior of the stator core and the air passages between the fins,