Patent ID: 7567000
Filing Date: 2009-07-28
Classification: F04D

Abstract:
1. An electric motor comprising: a shaft; a stationary part including a stator core having a plurality of teeth; a coil including a looped wire corresponding to each of the teeth of the stator core; a cup portion having substantially a cup shape and supported rotatably relative to the stationary part by a bearing mechanism therebetween, a rotating center of the cup portion being substantially concentric relative to a center axis of the shaft; a circuit board connected to the stationary part to supply an electric current to the coil and arranged axially below the stator core; a heat dissipating layer made of a thermally conductive material arranged on and extending along a surface of the circuit board which axially faces the coil; and a thermal conductive member made of a thermally conductive material contacting the coil and the heat dissipating layer; wherein the heat dissipating layer is divided into a plurality of areas, each of the areas corresponding to a coil arranged at each of the teeth.