Patent ID: 6309191
Filing Date: 2001-10-30
Classification: F04D

Abstract:
A brushless fan comprising:a rotor assembly including a cylindrical housing with an open bottom, a plurality of blades equally provided along the circumferential outer surface of the cylindrical housing, a central shaft secured to the top of the cylindrical housing having an annular groove at the bottom end, and a magnet frame fixed to the circumferential inner surface of the cylindrical housing;a stator assembly; anda frame including a space for receiving the rotor assembly, a central base, a tubelike shaft housing, and a bearing fitted in the shaft housing for receiving the shaft therethrough;wherein a first supporting member and a second supporting member are provided at the interior and the exterior abutted the bottom of the shaft housing for supporting the bearing and the stator assembly respectively such that the bearing and the stator assembly precisely position with respect to the shaft housing for obtaining an optimum magnetization, whereby the shaft can stably rotate under the influence of the magnetic field of the rotor assembly.