Direct current brushless motor structure that can be started...

Details Direct current brushless motor structure that can be started... Direct current brushless motor structure that can be started...

2001-06-15

2003-01-28

Nguyen, Tran (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S06700R, C310S216006, C310S216055, C310S216055, C310S254100

Reexamination Certificate

active

06512320

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a direct current brushless motor structure that can be started easily, wherein the direct current brushless motor has a larger rotational torque, and can be started easily, without any rotational dead corner.
2. Description of the Related Art
A conventional direct current brushless motor in accordance with the prior art shown in
FIG. 1
comprises a shaft tube
91
passed through a coil seat
90
, an upper pole plate
92
, and a lower pole plate
93
. The rotation shaft
95
of the rotor
94
may be supported and rotated on the shaft tube
91
. In the conventional direct current brushless motor, the pole faces of the upper pole plate
92
and the lower pole plate
93
are formed with cutouts
96
that are not located on the same circumference. Thus, when the pole faces are induced with the permanent magnet
97
of the rotor
94
, an uneven magnetic force is produced, so that the rotor
94
is easily started, thereby efficiently solving the phenomenon of the dead corner during rotation of the rotor
94
.
Referring to
FIG. 2
, in the conventional direct current brushless motor, the pole faces of the upper pole plate
92
and the lower pole plate
93
are formed with the cutouts
96
that are not located on the same circumference. Thus, a larger distance is formed between the cutouts
96
and the permanent magnet
97
. Thus, the inducing effect between the upper pole plate
92
, the lower pole plate
93
, and the permanent magnet
97
is poor, thereby reducing the rotational 26 torque of the motor.
SUMMARY OF THE INVENTION
The primary objective of the present invention is to provide a direct current brushless motor structure that can be started easily. The pole face provided on the pole plate of the direct current brushless motor structure is located on the circumference of the same diameter of the center of the pole plate, to form a minimum equal distance with the permanent magnet, so that the rotor has a larger torque, and may form an uneven magnetic force, so that the motor can be started easily.
In accordance with the present invention, there is provided a direct current brushless motor structure that can be started easily, including a stator provided with a plurality of pole plates. Each pole plate has a pole face. Each pole face is located on the circumference of the same diameter of the center of the pole plate, to form an equally spaced annular arrangement with the permanent magnet of the rotor. Each pole face of the pole plate has at least one magnetic plate extended upward or downward, and the magnetic plates are arranged in an equally angular staggered manner.
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:
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patent: 4775813 (1988-10-01), Janson
patent: 4804873 (1989-02-01), Shiraki et al.
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patent: 6285108 (2001-09-01), Horng
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