| 摘要 |
A heat dissipation fan that has a casing, a stator and a fan. The stator is pressed onto a sleeve secured in the casing. The stator has a coil and two pole disks respectively abutting opposite sides of the coil. A low-friction member is mounted in the sleeve. The fan is rotatably mounted in and around the stator inside the casing. A permanent magnet is mounted in the fan to make the fan a rotor. A shaft securely attached to the fan extends from the fan and passes through the low-friction member. The permanent magnet has an axial height shorter than that of the coil of the stator. The permanent magnet has a horizontal central line axially displaced from a horizontal central line of the coil of the stator. Accordingly, the fan with the shaft will not move axially during the operation of the heat dissipation fan. Power loss will be avoided.
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