Heat-dissipating fan structure

Details Heat-dissipating fan structure Heat-dissipating fan structure

2001-09-28

2003-05-20

Walberg, Teresa (Department: 3742)

Pumps

Condition responsive control of pump drive motor

By control of electric or magnetic drive motor

C310S06700R

Reexamination Certificate

active

06565326

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a heat-dissipating fan having a simplified structure and being capable of eliminating the magnetic resistance on the magnetically conductive path, thereby providing an improved rotational torque.
2. Description of the Related Art
FIG. 7
of the drawings illustrates a conventional heat-dissipating fan structure comprising a casing
90
having an axle seat
91
to which a stator bobbin
92
is mounted. The stator bobbin
92
comprises a winding
923
wound therearound, an upper pole plate
921
, and a lower pole plate
922
. Extended through the stator bobbin
92
is a metal axle tube
93
in which a bearing
94
is mounted for rotatably holding a shaft
96
of a rotor
95
. A permanent magnet
97
is mounted to the rotor
95
and comprises a north pole and a south pole that cooperates with a magnetic force generated in the edge of the upper and the lower pole plates
921
and
922
for generating a repulsive force, thereby driving the rotor
95
to turn.
In such a conventional heat-dissipating fan structure, the stator bobbin
92
is complicated and thus troublesome to manufacture as it has a winding
923
wound between the upper pole plate
921
and the lower pole plate
923
. In addition, since the stator uses a metal axle tube
93
to form a magnetically conductive path together with the upper pole plate
921
and the lower pole plate
922
, magnetic resistance exists in the material per se, which, in turn, results in an increase in the overall magnetic resistance, and the rotational torque is adversely affected accordingly.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a heat-dissipating fan structure that has fewer elements and thus has a smaller volume for easy manufacture and processing.
Another object of the present invention is to provide a heat-dissipating fan structure that directly creates a mutual repulsive force between a magnetic field generated by the winding and the permanent magnet having a south pole and a north pole to thereby eliminate the magnetic resistance on the magnetically conductive path, thereby providing an improved rotational torque.
A heat-dissipating fan structure in accordance with the present invention comprises a frame having a through-hole. An air inlet and an air outlet are respectively defined in two ends of the through-hole. A support section is provided in an end of the through-hole and at least two sets of windings are engaged on the frame. An IC control means is mounted on the frame and electrically connected to the windings. A rotor comprises a shaft and plural blades, and a permanent ring magnet is mounted around the blades. An end of the shaft is rotatably received in the support section of the frame. A repulsive magnetic force is directly created between the permanent ring magnet and the windings of the frame to drive the rotor to turn.
Other objects, specific advantages, and novel features of the invention will become more apparent from the following detailed description and preferable embodiments when taken in conjunction with the accompanying drawings.


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patent: 2002/0135247 (2002-09-01), Liao
patent: 10243620 (1998-09-01), None

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