Miniature motor structure

Details Miniature motor structure Miniature motor structure

2001-11-09

2004-09-07

Mullins, Burton (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S0400MM, C310S049030, C310S164000

Reexamination Certificate

active

06787964

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a motor structure, and more particularly to a miniature motor structure.
2. Description of the Prior Art
As shown in
FIG. 1
, the stator structure of a conventional miniature motor includes an upper silicon steel
10
, a bearing tube
20
, a lower silicon steel
30
and a coil
40
. Among these, the upper silicon steel
10
and the lower silicon steel
30
are annular in shape. Besides, there are upper side plates or lower side plates extending upward or downward from the outer periphery of the upper silicon steel
10
and the lower silicon steel
30
. The cylindrical bearing tube
20
provides a rivet joint so as to joint the upper silicon steel
10
, the coil
40
and the lower silicon steel
30
together. Further, the coil
40
is sandwiched between the upper silicon steel
10
and the lower silicon steel
30
.
The disadvantage of the conventional miniature motor at least includes that the bearing tube
20
providing a rivet joint is required for jointing the upper silicon steel
10
, the coil
40
and the lower silicon steel
30
together. That is, the conventional miniature motor is not easy to fabricate.
SUMMARY OF THE INVENTION
The present invention discloses a miniature motor structure omitting the prior bearing tube described above to reduce cost and simplify the required fabricating process.
The present miniature motor structure includes a first coil seat, second coil seat, a coil, a circular magnet, a metal housing and a shaft. The first coil seat includes a first bottom plate, a plurality of first outer teeth and a plurality of first inner teeth. The first bottom plate further includes a first central opening. The first outer teeth protrude from the first bottom plate and surround the outer periphery of the first bottom plate. The first inner teeth protrude from the first bottom plate and surround the first central opening. Further, the coil is positioned in the first coil seat.
The second coil seat includes a second bottom plate, a plurality of second outer teeth and a plurality of second inner teeth. The second bottom plate further includes a second central opening. The second outer teeth protrude from the second bottom plate and surround the outer periphery of the second bottom plate. The second inner teeth protrude from the second bottom plate and surround the second central opening.
The second bottom plate of the second coil seat is formed above the coil and the first coil seat. Besides, each of the second outer teeth is interposed between the adjacent first outer teeth. Each of the second inner teeth is interposed between the adjacent first inner teeth. In this manner, the first coil seat and the second coil seat define a space accommodating the coil. In addition, the first inner teeth and the second inner teeth form a post for winding the coil. By means of the first inner teeth and the second inner teeth, the first coil seat and the second coil seat are coupled to each other. In the preferred embodiment, both of the first coil seat and the second coil seat are made of silicon steel. However, other magnetic conduction material, such as nickel steel, is applicable to the first coil seat and the second coil seat. The coil may be a preformed coil. Alternatively, the coil may be the coil wound around the post.
The first coil seat, the second coil seat and the coil construct the stator of the present invention. The first coil seat and the second coil seat may be identical to each other. That is, the stator may be composed of a first coil seat, an upside-down first coil seat and a coil. However, the first coil seat may be different from the second coil seat. Besides, the first coil seat and the second coil seat are made of sheet metal.
In order to advantageously adjust the angle of magnetic inclination to start the motor, the outer teeth optionally includes a cut corner, an arc and a gap may extending from the outer teeth to the bottom plate.


REFERENCES:
patent: 3383534 (1968-05-01), Ebbs
patent: 4656381 (1987-04-01), Komatsu
patent: 4899075 (1990-02-01), Hasebe
patent: 5945765 (1999-08-01), Chen
patent: 6166470 (2000-12-01), Miyazawa et al.
patent: 11-275847 (1999-10-01), None

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