Patent ID: 7044721

Claim:
A casing for a brushless dc motor of a heat-dissipating fan, the casing comprising a bottom board and a plurality of sidewalls extending from the bottom board, the bottom board and the sidewalls being integrally formed by punching a single magnetic conductive sheet to form a magnetically conductive plate, the bottom board including a base, with a stator having a coil assembly mounted on the base of the bottom board, with an axial hole being defined in an axle tube, with a bearing mounted in the axle tube for rotatably holding a shaft of a rotor, and with a plurality of magnetic pole faces formed on the bottom board by means of punching the single magnetic conductive sheet, with the magnetic pole faces surrounding the axial hole and being adjacent to the coil assembly of the stator, wherein said single magnetic conductive sheet is arranged to include a complete set of the pole faces for the brushless dc motor, said brushless dc motor including a single said pole plate and no other pole plates.