Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2001-11-01
2004-03-09
Le, Dang (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S194000, C310S216006, C310S254100
Reexamination Certificate
active
06703757
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a motor structure, and more particularly to a motor structure having lower profile.
DESCRIPTION OF THE PRIOR ART
Recently, electrical devices trend to be compact. For example, notebook computers are getting thinner and thinner. To meet the demand of compact electrical device, a fan having lower profile is required.
In developing the fan having lower profile, the most important problem is that the stator of the conventional motor cannot meet the requirement of the designer, and there are difficulties in manufacturing a stator having lower profile.
FIG. 1
is a partial cross-sectional view illustrating a conventional motor structure.
FIG. 2
is a side view illustrating the conventional motor structure shown in
FIG. 1
Referring to FIG.
1
and
FIG. 2
, the motor structure includes a magnetic ring
100
and a stator
200
. The magnetic ring
100
is a part of a rotor (not completely shown). The stator
200
includes a silicon steel set
201
with four poles and a coil (wirings)
202
wound on the silicon steel set
201
.
Since the silicon steel set
201
is composed of a plurality of silicon steel sheet stacked together, the edges of the silicon steel set
201
are sharp. Therefore, a film or cover (not shown) is needed to cover the silicon steel sheet
201
for winding the coil
202
without damaging them.
In the above-mentioned motor structure, the method of winding of the coil wastes a lot of space, that is, the coil cannot totally fill the circular area surrounded by the silicon steel set
201
, deteriorating the performance of the motor.
In order to make the above-mentioned motor structure thin, there may occur the following effects:
(a)since the number of the silicon steel must be relatively small and the space for the winding is insufficient, the motor performance is relatively poor.
(b)since the size of the stator is relatively small and the tolerance is relatively strict, the difficulty level is increased in manufacturing and assembling the motor; and
(c)since the edge of the silicon steel sheet of a thin stator are relatively sharp, the wirings wound thereon are easily damaged and short-circuit the coil.
In general, the stability of the operating motor depends on the number of poles of the motor. In the above-mentioned motor structure, the number of poles thereof is four. If the number of poles is increased to eight, undesirable problems occur. For example, difficulty in winding the wirings may occur. Also in a condition that seldom occurs, the motor may easily short out or the performance thereof will be poor.
SUMMARY OF THE INVENTION
Therefore, the main object of the present invention is to provide a motor structure having lower profile capable of improving the performance and facilitating the manufacturing processes.
The above object of the present invention is achieved by providing a motor structure including a stator having a coil seat, and a rotor having a circular magnet located above the coil seat. The coil seat is defined by a bottom plate, a plurality of first teeth and a plurality of second teeth. The first teeth are formed around the inner periphery of the bottom plate. The second teeth are formed around the outer periphery of the bottom plate. Each of the first teeth and the second teeth further includes a first extending portion and a second extending portion, respectively.
The motor structure further has a base for accommodating the coil seat. Alternatively, the coil seat is formed on an optional concavity of the base.
Furthermore, the stator further includes a shaft substantially perpendicular to, and fixed on the base. A ring-shaped groove is formed on the shaft. The rotor also includes a hub, a metal sheet, and a bearing. The metal sheet, arranged between the hub and the circular magnet, is used to avoid magnetic leakage. The shaft penetrates the bearing. The motor structure may further include an engagement ring and an elastic ring. The engagement ring is positioned on the bearing for fixing the bearing. The elastic ring is positioned in the ring-shaped groove for elastically fixing the bearing. The engagement ring and the elastic ring are used to fix the bearing so as to prevent the bearing and the shaft form separating along the axial direction of the shaft.
REFERENCES:
patent: 1622261 (1927-03-01), Payne
patent: 3312842 (1967-04-01), Heuchling et al.
patent: 3437897 (1969-04-01), Lenny
patent: 3700942 (1972-10-01), Alth
patent: 4307309 (1981-12-01), Barrett
patent: 4585979 (1986-04-01), Sakamoto et al.
patent: 4922162 (1990-05-01), Shiraki et al.
patent: 4949000 (1990-08-01), Petersen
patent: 5148069 (1992-09-01), Nonaka et al.
patent: 5406157 (1995-04-01), New
patent: 6388346 (2002-05-01), Lopatinsky et al.
Chou Chu Hsien
Huang Wen-Shi
Lin Kuo-Cheng
Tsai Ming-Shi
Birch & Stewart Kolasch & Birch, LLP
Delta Electronics , Inc.
Le Dang
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