Patent ID: 8198765

Claim:
A motor assembly comprising: a housing having a housing wall which defines an accommodation chamber therein, and which extend in an axial direction to terminate at first and second peripheral edges, and first and second end walls extending radially from said first and second peripheral edges, respectively, toward an axis, so as to close said accommodation chamber; a rotor subassembly including a revolving shaft having first and second shaft ends which are supported on said first and second end walls, respectively, to permit said revolving shaft to be revolvable about the axis, a magnet mounting portion which is disposed in said accommodation chamber, which surrounds and which is rotatable with said revolving shaft about the axis, and a magnet which is disposed on said magnet mounting portion, and which has a plurality of rotor magnetic poles that are oriented radially; a stator subassembly including a magnetically inducible core disposed in said accommodation chamber, and having a plurality of stator poles which are angularly displaced from one another about the axis, and each of which confronts and is spaced apart from a corresponding one of said rotor magnetic poles in a radial direction relative to the axis, and a plurality of stator windings wound on said stator poles, respectively, such that, when said stator windings are fed with electricity, said magnet mounting portion is induced to rotate together with said revolving shaft about the axis, each of said stator windings having first and second end-wall-side regions which are respectively spaced apart from said first and second end walls by first and second axial intervals, respectively; and a primary thermally conductive bridging member disposed to span at least one of said first and second axial intervals to conduct heat emanating from a corresponding one of said stator windings to a corresponding one of said first and second end walls so as to dissipate heat out of said accommodation chamber.