Patent ID: 7300262
Filing Date: 2007-11-27
Classification: F04D,H02K

Abstract:
1. A heat dissipation fan comprising: a stator comprising a core, a coil and a circuit board; a rotor surrounding the stator and comprising a hub having a top wall and a circumferential wall depending from the top wall, a permanent magnet being attached to an inner surface of the circumferential wall, slots being defined through the top wall of the hub and facing the permanent magnet for facilitating assembling and disassembling the magnet; and a fan frame having a bearing seat, the bearing seat comprising a base and a central tube around which the stator is mounted, the base defining slots corresponding to the slots of the hub; wherein outer air is capable of being forced into the hub via the slots of one of the hub and the base and out of the hub via the slots of the other of the hub and the base to create an airflow through the stator thereby carrying away heat generated by the stator.