Construction of motor

Details Construction of motor Construction of motor

1999-08-18

2001-11-20

Nguyen, Tran (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S06700R, C310S089000, C360S099080, C360S099040, C360S098070

Reexamination Certificate

active

06320291

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to an improved motor structure.
BACKGROUND OF THE INVENTION
A motor is an important part in a fan. As systems to be cooled become thinner and thinner, the thickness of a fan for use in of systems has to be reduced. Consequently, the thickness such the motor in the fan has to be reduced too.
A bearing is an important member in a motor structure. It can be understood to those skilled in the art that the bearing has to be secured to its position by pre-loading so that it can operate in a good condition. There are some ways for pre-loading a bearing. For example, as shown in FIG. 2 of U.S. Pat. No. 5,343,104, the bearing is secured to its position by means of a projected portion 9 of a bearing race 8 and a thrust plate 33. The thrust plate 33 is secured by a stopper 34 that is attached onto the end portion of the shaft 14 against the thrust plate 33 by means of press fitting. Moreover, as shown in FIG. 8 of the patent, the bearing race 8 has to be secured to a stator 17 by a U-shaped groove, a plurality of projections 31, and tapered faces 25. This involves quite a few members and a complex structure. Therefore, it is hard to reduce the fan thickness in the case of adopting the fan motor in accordance with this prior art United State patent.
The structure of a conventional fan motor on the market is described in the following for explaining another way of securing the bearing.
A conventional fan motor structure as shown in
FIG. 1
includes a base
101
, a bearing seat
102
, bearings
103
and
104
, a shaft
105
, an impeller
108
, a coil assembly
106
, a printed circuit board
107
, a spring
109
, and a C-ring
110
. The bearing seat
102
locates in a central portion of the base
101
and has a projection
102
a.
The bearings
103
and
104
are inserted from below and from above respectively into the bearing seat
102
and separated by the projection
102
a.
The shaft
105
is formed with a circumferential groove
105
a.
The impeller
108
is fixed on the shaft
105
for rotation therewith and has a hub
108
a
and a plurality of blades
108
b.
The coil assembly
106
includes a silicon steel set
106
a,
an insulation portion
106
b,
a coil
106
c,
and a snap engaging portion
106
d.
The printed circuit board
107
is fixed on the base
101
and in snap engagement with the snap engaging portion
106
d.
As shown in
FIG. 1
, the spring
109
is provided at an upper end of the bearing
104
and the C-ring
110
is provided at the lower end of a bearing
103
for securing the bearings
103
and
104
. The two ends of the spring
109
contact the bearing
104
and the hub
108
a
respectively. The spring
109
and the projection
102
a
cooperatively secure the bearing
104
. On the other hand, the C-ring
110
is engaged with the circumferential groove
105
a
formed on the shaft
105
. The elastic force provided by the spring
109
and the cooperation between the C-ring
110
and the projection
102
a
can secure and pre-load the bearing
103
.
The disadvantages of the above-mentioned fan motor is described in the following with reference to FIG.
1
. The bearing seat
102
is secured to the base
101
and the coil assembly
106
can be fixed to an outer surface of the bearing seat
102
by glue. The function of positioning the bearings
103
and
104
is cooperatively provided by the bearing seat
102
, spring
109
, and C-ring
110
. Due to that the bearing seat
102
and the bearings
103
and
104
are substantially rigid, the vibration generated when the motor operates cannot be effectively absorbed in the case that there is a clearance between any of the bearings (
103
and
104
) and the bearing seat
102
(especially in the case of clearance fitting). Moreover, due to that the bearing seat
102
must contact the bearings
103
and
104
, the base
101
, and the coil assembly
106
at the same time, each of these members must be assigned a strict size and tolerance. This makes a complex assembly process.
Furthermore, the primary function of the spring
109
and the C-ring
110
is to provide securing forces to the bearings
103
and
104
. If a single member can provide the same function, not only the related manufacturing and assembly processes can be simplified but also it becomes possible to produce a super-thin motor.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide an improved motor structure that can provide the functions of absorbing vibrations and noises caused by assembly clearances and of pre-loading and fixing the bearing(s) therein by means of less elements, can be used to produce a thin fan, and can facilitate the assembly process.
In the motor structure, the elastic ring for elastically securing the at least one bearing is an o-ring or a helical spring.


REFERENCES:
patent: 4682065 (1987-07-01), English et al.
patent: 4934041 (1990-06-01), Hoover et al.
patent: 5343104 (1994-08-01), Takahashi et al.
patent: 5492458 (1996-02-01), Horng
patent: 5663604 (1997-09-01), Takahashi
patent: 5959383 (1999-09-01), Winzen et al.
patent: 5982066 (1999-11-01), Marracino et al.
patent: 6000919 (1999-12-01), Hsieh

Affiliated with

Also associated with

Rating

Construction of motor does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Construction of motor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Construction of motor will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2601336