| 摘要 |
An electric fan includes a housing having a hub formed in the center, a shaft has one end force-fitted in the hub and having an annular flange formed in the other end, two polar plate are force-fitted on the shaft, and a stator is disposed between the polar plates. The upper polar plate and the lower polar plate each includes a hole for engaging with the shaft and the holes have one or more teeth for solidly engaging with the shaft.
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