Patent ID: 6488483
Filing Date: 2002-12-03
Classification: F04D

Abstract:
A heat dissipation fan comprising:a casing; a sleeve secured in the casing; a stator pressed onto the sleeve and having a coil with two sides and two pole disks respectively abutting opposite sides of the coil; a low-friction member mounted in the sleeve and having a passage defined through the low-friction member; a fan rotatably mounted around the stator inside the casing; a permanent magnet mounted in the fan to make the fan a rotor; a shaft securely attached to the fan extending from the fan and passing through the passage in the low-friction member; and a locking disk securely mounted on a free end of the shaft to lock the shaft in the low-friction member, wherein the permanent magnet has an axial height shorter than that of the coil of the stator; and the permanent magnet has a horizontal central line axially displaced from a horizontal central line of the coil of the stator.