| 摘要 |
An improved motor structure comprising a hollow stator base having a substantially cylindrical hub including a central hole, and a hollow stator having a silicon steel sheets set and a central bore through which the hub is inserted upon assembling. The hub is composed of a plurality of first upright ribs and a plurality of second upright ribs which are of the same number and are alternately arranged in circumferential direction, and a substantially cylindrical lower portion connecting to the lower end of each upright rib. Each pair of adjacent first upright rib and second upright rib are slightly apart from each other. Every first upright rib has an outer engaging portion formed on the upper outer surface thereof and every second upright rib has an outer step portion formed on the outer surface thereof, whereby the silicon steel sheets set of the stator may be engaged by and between the outer engaging portion and the outer step portion so as to retain the stator in axial direction relative to the stator base. Besides, the hub has a first non-cylindrical outer surface, and the central bore of the stator has a second non-cylindrical inner surface engaged with the first non-cylindrical outer surface. Thus the stator may be retained in circumferential direction relative to the stator base through engagement between the first non-cylindrical outer surface and the second non-cylindrical inner surface.
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