Direct current brushless motor

Details Direct current brushless motor Direct current brushless motor

2001-11-14

2003-08-19

Le, Dang (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310SDIG006, C310S207000, C336S200000

Reexamination Certificate

active

06608411

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a direct current brushless motor, and more particularly to a direct current brushless motor that may be worked, assembled and manufactured conveniently.
2. Description of the Related Art
A conventional direct current brushless motor structure shown in
FIG. 5
comprises a cylindrical base
90
having a through hole (or a chamber) which is formed with a shaft hole
91
in which a rotation shaft of a rotor
92
is rotatably mounted. The base
90
has an outer wall formed with fixing members
93
for combination of coils
94
. The base
90
is provided with a control member
95
. The coil
94
is magnetically induced with the permanent magnet
96
of the rotor
92
, so that the rotor
92
may be driven to rotate.
Another conventional direct current brushless motor structure shown in
FIG. 6
comprises a base
80
having a through hole
81
whose one end is provided with a support portion
82
. The base
80
has a control member
83
, and an even number of coils
84
. The base
80
is provided with a positioning member
85
made of magnetically conductive material mounted between two coils
84
. The rotor
86
has a rotation shaft rotatably mounted in the support portion
82
of the base
80
. The rotor
86
has a permanent magnet ring
87
which has a pole N and a pole S each having a strong magnetic region
88
respectively. Thus, when the rotor
86
stops rotating, the strong magnetic region
88
and the positioning member
85
of the base
80
attract magnetically.
The above-mentioned conventional direct current brushless motor structures need to have even numbers of coils that are fixed on the periphery of the base respectively. Thus, the conventional direct current brushless motor structures need to be wound with even numbers of coils previously during fabrication, and the even numbers of coils are then fixed on the periphery of the base respectively, thereby causing inconvenience in fabrication.
SUMMARY OF THE INVENTION
The primary objective of the present invention is to provide a direct current brushless motor that may be worked, assembled and manufactured conveniently.
A secondary objective of the present invention is to provide a direct current brushless motor that may reduce the cost of fabrication.
In accordance with the present invention, there is provided a direct current brushless motor, including a base having a receiving chamber whose one end is combined with a cover plate. The other end of the receiving chamber and the cover plate each have a shaft hole, for pivoting the rotation shaft of the rotor. A film printed circuit is mounted on the periphery of the base. The film printed circuit has at least two coil sets, a Hall sensing drive member set, and a connecting end for connection with a power supply. The coil sets of the film printed circuit are oppositely distributed on the periphery of the base in an equally angular manner with the receiving chamber serving as a center. After the multiple coil sets are energized, the multiple coil sets and the permanent magnet ring of the rotor may produce mutually repulsive forces, so that the rotor may be driven to rotate successively.
Further benefits and advantages of the present invention will become apparent after a careful reading of the detailed description with appropriate reference to the accompanying drawings.


REFERENCES:
patent: 3736543 (1973-05-01), Lademann et al.
patent: 4431932 (1984-02-01), Nathenson et al.
patent: 4563622 (1986-01-01), Deavers et al.
patent: 4645961 (1987-02-01), Malsky
patent: 4665331 (1987-05-01), Sudo et al.
patent: 4924125 (1990-05-01), Clark
patent: 4939400 (1990-07-01), Matsushita et al.
patent: 4962329 (1990-10-01), Fujita et al.
patent: 5105114 (1992-04-01), Sickle et al.
patent: 5493157 (1996-02-01), Nakamura
patent: 5920139 (1999-07-01), Fujiwara et al.

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