Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2001-09-28
2004-06-15
Dougherty, Thomas M. (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S156050, C310S256000, C318S133000
Reexamination Certificate
active
06750586
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a DC brushless motor structure that is comprised of fewer members, is easy to process and assemble, and is reduced to a minimized volume.
2. Description of the Related Art
FIG. 12
of the drawings illustrates a conventional DC brushless motor structure comprising a stator bobbin
90
having upper and lower pole plates
91
and
92
respectively mounted to an upper end and a lower end thereof. A metal axle tube
93
extends through the upper and lower pole plates
91
and
92
, the stator bobbin
90
, and a circuit board
94
. A bearing
95
is mounted in the metal axle tube
93
for rotatably holding a shaft
97
of a rotor
96
. A permanent magnet
98
is mounted to the rotor
96
and comprises a north pole and a south pole that cooperate with a magnetic force created in the edge of the upper and lower pole plates
91
and
92
for generating a repulsive force, thereby driving the rotor
96
to turn.
FIG. 13
of the drawings illustrates another conventional DC brushless motor structure comprising a stator
80
comprised of plural laminated silicon steel plates. Windings
82
are wound around the pole arms
81
of the stator
80
. Engaged in a central portion of the stator
80
is an axle tube
83
that extends through a circuit board
84
. A bearing
85
is mounted in the axle tube
83
for rotatably receiving a shaft
87
of a rotor
86
. A permanent magnet
88
is mounted to the rotor
86
and comprises a north pole and a south pole that cooperate with a magnetic force created between the pole arms
81
for generating a repulsive force, thereby driving the rotor
86
to turn.
In these conventional DC brushless motor structure, since the upper and lower pole plates
91
and
92
and the metal axle tube
93
are used to create a magnetically conductive path for driving the rotor
96
,
86
, the overall volume of the motor structures cannot be effectively reduced. In addition, since the repulsive magnetic force created between the upper and lower pole plates
91
and
92
and the permanent magnet
98
,
88
for turning the rotor
96
,
86
requires a magnetically conductive path created by the upper and lower pole plates
91
and
92
and the metal axle tube
93
, an increase in the overall magnetic resistance is caused, as magnetic resistance exists in the materials for these elements. The rotational torque is adversely affected accordingly.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a DC brushless motor structure that is comprised of fewer members and is thus easy to process and assemble.
Another object of the present invention is to provide a DC brushless motor structure that is reduced to a minimized volume to thereby have a wider application.
A further object of the present invention is to provide a DC brushless motor structure in which a mutual repulsive force is created between a magnetic field created as a result of energizing windings and a permanent magnet having a north pole and a south pole without the need of creating a magnetically conductive path by any magnetically conductive elements. Thus, the magnetic resistance is reduced to the minimum and the DC brushless motor has an improved rotational torque.
A DC brushless motor structure in accordance with the present invention comprises a cylinder-like base having a through-hole or a chamber. The through-hole acts as an axle hole for rotatably receiving a shaft of a rotor. Alternatively, the shaft of the rotor is rotatably received in the chamber. An axle hole is defined in an end of the base. Another axle hole is defined in a lid attached to an end of the base. The shaft of the rotor is rotatably received in the axle holes. At least two sets of windings are mounted to the base. Also mounted to the base is an IC control member that is electrically connected to the windings. A magnetic force is generated by a magnetic field that is created as a result of energizing the windings to thereby repulse the permanent magnet of the rotor having a north pole and a south pole, thereby driving 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.
REFERENCES:
patent: 5075605 (1991-12-01), Hedricks
patent: 6565326 (2003-05-01), Horng
Hong Ching-Shen
Horng Alex
Yin Tso-Kuo
Bacon & Thomas PLLC
Dougherty Thomas M.
Mohandesi Iraj A.
Sunonwealth Electric Machine Industry Co. Ltd.
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