Miniature brushless dc fan motor

Details Miniature brushless dc fan motor Miniature brushless dc fan motor

2003-02-27

2004-04-20

Mullins, Burton S. (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S063000, C310S156010

Reexamination Certificate

active

06724106

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention is related to a miniature brushless dc fan motor and more particularly to a permanent magnet set incorporated into a center of a fan wheel, and plural coils incorporated into an annular housing, thereby forming an air channel between the permanent magnet set and the coils.
2. Description of the Related Art
Referring to
FIG. 1
, a conventional miniature fan
1
includes a bearing assembly
11
, a stator
12
and a rotor
13
. The bearing assembly
11
includes at least one bearing located at a center of the stator
12
. The stator
12
is provided with a plurality of coils
121
and a plurality of pole plates
122
. After assembling, the bearing assembly
11
and the stator
12
are co-axially fixed at a center of a fan housing
10
. The rotor
13
includes a shaft
131
, a permanent magnet set
132
and a blade set
133
. The shaft
131
of the rotor
13
extends through the bearing assembly
11
to nest the stator
12
in the rotor
13
and thus the miniature fan
1
is assembled. So then the blade set
133
is extended outward from the outer circumference of the rotor
13
and adapted to drive air.
The assembled arrangement of the blade set
133
, the permanent magnet set
132
, the coils
121
and the bearing assembly
11
is nested in order from a maximum diameter to a minimum diameter. In addition to the blade set
133
, a radial air gap must further be provided between the permanent magnet set
132
and the coils
121
to thereby induce mutually and rotate the rotor
13
. Consequently, the diameter of the miniature fan cannot further be reduced and thus such structural arrangement is unsuitable for miniature fan manufactures.
Referring to
FIG. 2
, an another conventional miniature fan
2
includes a bearing assembly
21
, a rotor
22
and a stator
23
. The bearing assembly
21
includes at least one bearing located at a center of stator
22
. The rotor
22
includes a permanent magnet set
221
and a blade set
222
whose outer circumference is surrounded by the permanent magnet set
221
. After assembling, the bearing assembly
21
and the rotor
22
are co-axially mounted to a center of a fan housing
20
. The stator
23
includes a coil set
231
and a plurality of pole plates
232
, which are secured to an inner circumference of the fan housing
20
. So then the blade set
222
is extended between the axial assembly
21
and the stator
23
and adapted to drive air.
The assembled arrangement of the coil set
231
, the permanent magnet set
221
, the blade set
222
and the bearing assembly
21
is nested in order from a maximum diameter to minimum diameter. In addition to the blade set
222
, a radial air gap must further be provided between the permanent magnet set
221
secured to the outer circumference of the blade set
222
, and the coil set
231
, thereby the coil set
231
able to induce with the permanent magnet set
221
and rotate the rotor
22
. Consequently, the diameter of the miniature fan cannot further be reduced and thus such structural arrangement is unsuitable for miniature fan manufactures.
The present invention intends to provide a miniature brushless dc fan motor, wherein a permanent magnet set incorporated into a center of a fan wheel and, plural coils incorporated into an annular housing, thereby increasing a sectional area of an air channel formed between the permanent magnet set and the coils in such a way to mitigate and overcome the above problem.
SUMMARY OF THE INVENTION
The primary objective of this invention is to provide a miniature brushless dc fan motor, which includes a permanent magnet set incorporated into a center of a fan wheel and, plural coils incorporated into an annular housing, and an air channel formed between the permanent magnet set and the coils so that a sectional area of the air channel is increased.
The miniature brushless dc fan motor in accordance with the present invention comprises an annular housing, a bearing assembly, a permanent magnet set, a blade set and a coil set. The permanent magnet set is inserted into a hub of the blade set which is located at a center. A shaft is extended through the permanent magnet set to form a rotor. The coil set is secured to an inner circumference of the annular housing and radially aligned with the permanent magnet set. An air channel is formed between the permanent magnet set and the coil set, and adapted to accommodate the blade set.


REFERENCES:
patent: 5607329 (1997-03-01), Cho et al.
patent: 6388346 (2002-05-01), Lopatinsky et al.
patent: 6565326 (2003-05-01), Horng et al.
patent: 6608411 (2003-08-01), Horng et al.

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