Stator assemblies for motors

Details Stator assemblies for motors Stator assemblies for motors

2001-06-15

2002-08-27

Nguyen, Tran (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S06700R, C310S216055, C310S254100, C310S216055, C310S257000

Reexamination Certificate

active

06441531

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to stator assemblies for motors, and more particularly to stator assemblies having improved magnetic conduction effect, thereby avoiding dead corner of rotation and increasing the rotating torque.
2. Description of the Related Art
FIGS. 11 and 12
of the drawings illustrate a conventional stator comprising an axle tube
91
having an upper pole plate
92
, a bobbin
93
, and a lower pole plate
94
mounted therearound. Walls
95
project outward from a portion of a periphery of the upper pole plate
92
and extend along a direction parallel to a longitudinal direction of the upper pole plate
92
. Similarly, walls
96
project outward from a portion of a periphery of the lower pole plate
94
and extend along a longitudinal direction of the lower pole plate
94
. Thus, the walls
95
and
96
provide a larger magnetically conductive area with a permanent ring magnet on a rotor. However, the sectional thickness of each of the upper and lower pole plates
92
and
94
is not increased although the induction area is increased, as the upper pole plate
92
and the lower pole plate
94
are formed by means bending silicon steel sheets of identical thickness. As a result, the magnetic conduction effect is poor, the rotational torque is insufficient, the rotation is unstable, and floating rotation may occur.
SUMMARY OF THE INVENTION
It is the primary object of the present invention to provide a stator assembly that has improved magnetic conduction effect to thereby increase the rotational torque.
It is another object of the present invention to provide a stator assembly without dead corner of rotation, thereby allowing easy starting of the rotor.
A stator assembly in accordance with the present invention comprises upper and lower pole plates or silicon steel sheets each having a plurality of radial poles. Each radial pole includes a magnetic pole face extending along a direction parallel to a longitudinal direction. The magnetic pole faces of each upper pole plate, each lower pole plate, or each silicon steel sheet may be of the same or different length. Alternatively, the magnetic pole faces may be overlapped with each other or not overlapped with each other. The overall magnetic pole face formed by the magnetic pole faces may be so arranged to represent a step-like structure or an inclined side.
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: 2672564 (1954-03-01), Krasno
patent: 3495113 (1970-02-01), Haydon
patent: 4051401 (1977-09-01), Hayward
patent: 4388545 (1983-06-01), Honsinger et al.
patent: 4949000 (1990-08-01), Petersen
patent: 4987331 (1991-01-01), Horng
patent: 5539263 (1996-07-01), Lee
patent: 5854526 (1998-12-01), Sakamoto
patent: 5859487 (1999-01-01), Chen
patent: 5917262 (1999-06-01), Huang et al.

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