Direct current brushless motor of radial air-gap

Details Direct current brushless motor of radial air-gap Direct current brushless motor of radial air-gap

2001-04-11

2003-03-25

Nguyen, Tran (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S216006

Reexamination Certificate

active

06538357

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a direct current brushless motor of a radial air-gap, having a larger sensing area, and the coating wire of the stator coil is easily drawn outward for installation.
2. Description of the Related Art
A first conventional direct current brushless motor in accordance with the prior art shown in
FIG. 1
comprises a metallic shaft tube
901
having an outer wall combined with a coil
902
, upper and lower pole plates
903
,
904
, and a circuit board
905
. The metallic shaft tube
901
includes a flange
906
at one end thereof. By such an arrangement, the upper and lower pole plates
903
,
904
are formed by laminated silicon plates for increasing the magnetic sensing area between the upper and lower pole plates
903
,
904
and the permanent magnet
908
of the rotor
907
. Thus, increase of the number of the pole plates will increase the working process of fabrication, the material, and the cost of the product.
A second conventional direct current brushless motor in accordance with the prior art shown in
FIG. 2
is disclosed in U.S. Pat. No. 4,891,567, wherein the upper and lower pole plates
911
are combined on the stator seat
910
. Each of the upper and lower pole plates
911
has vertically bent pole faces
912
which are induced with the permanent magnet
914
of the rotor
913
. The two pole faces
912
of the upper and lower pole plates
911
are extended toward each other, so that two pole faces
912
of the upper and lower pole plates
911
encompass the outer periphery of the stator seat
910
. The pole faces
912
of the upper and lower pole plates
911
have a larger sensing area. However, when the distal end of the coating wire of the coil is drawn outward from the pole faces
912
of the upper and lower pole plates
911
, the insulation layer of the coating wire are easily scraped and broken by the coarse edges of the pole faces
912
, so that the coil winding is easily broken after it is impacted by the starting current during long-term utilization, thereby affecting operation of the motor, and thereby reducing the lifetime of the motor. In addition, if the width of the pole face
912
of the upper and lower pole plates
911
is decreased to facilitate pulling out of the distal end of the coating wire of the coil, the sensing area between the pole face
912
and the rotor is reduced, thereby decreasing the quality of the motor during fabrication.
A third conventional direct current brushless motor in accordance with the prior art shown in
FIG. 3
is disclosed in the Applicant's U.S. patent application Ser. No. 09/389,018, wherein the first pole plate
921
is provided with a magnet conducting tube
922
for combination of the second pole plate
924
. The outer wall of the magnet conducting tube
922
is fitted with an insulating bushing
923
which may be wound with a coil. The first pole plate
921
and the second pole plate
924
are respectively provided with pole faces
925
,
926
each extended toward an opposite direction. Thus, the direct current brushless motor and the stator have pole faces with a larger sensing area, and the coil is directly wound around the insulating bushing
923
, so that the coating wire is not easily scraped, thereby preventing the insulation layer from being broken.
SUMMARY OF THE INVENTION
The primary objective of the present invention is to provide a direct current brushless motor of a radial air-gap, wherein the pole plate of the stator has pole faces with a larger sensing area to induce with the permanent magnet of the rotor, thereby increasing the output torque of the motor.
Another objective of the present invention is to provide a direct current brushless motor of a radial air-gap, wherein the pole faces around the coil seat are formed with larger openings for facilitating pulling out of a distal end of a coating wire of the coil seat, thereby preventing the coating wire from being scraped, and thereby preventing the insulation layer from being broken, and the stator has pole faces with a larger sensing area.
A further objective of the present invention is to provide a direct current brushless motor of a radial air-gap, which is easily machined, thereby decreasing the cost of production.
In accordance with the present invention, there is provided a direct current brushless motor of a radial air-gap includes a rotor having a rotation shaft rotated in a magnetic conducting tube of the stator. The magnetic conducting tube has an outer wall combined with a coil seat. The coil seat has two ends respectively mounted with an upper pole plate and a lower pole plate. Each of the upper pole plate and the lower pole plate has a periphery having upper pole faces and/or lower pole faces respectively extended upward and downward therefrom. Each pole face is induced with the permanent magnet of the rotor. The pole faces of the upper pole plate and the lower pole plate are arranged in a staggered manner. The pole faces encompassing the coil seat are formed with larger openings for allowing pull out of a distal end of a coating wire of the coil seat.


REFERENCES:
patent: 3508091 (1970-04-01), Kavanaugh
patent: 4775813 (1988-10-01), Janson
patent: 4823038 (1989-04-01), Mizutani et al.
patent: 5808390 (1998-09-01), Miyazawa et al.
patent: 5859487 (1999-01-01), Chen
patent: 5945765 (1999-08-01), Chen
patent: 6285108 (2001-09-01), Horng

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