Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2003-01-13
2004-07-13
Lam, Thanh (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S216006
Reexamination Certificate
active
06762519
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention is related to an outer rotor structure for an ac fan and more particularly to an outer rotor structure adapted to be combined with metal blades for convenient assembly.
2. Description of the Related Art
Referring to
FIG. 1
, a conventional ac fan includes an outer rotor
9
. The outer rotor
9
generally consists of a plurality of annular pole plates
90
, which are stacked on each other. The stacked pole plates
90
are combined with a rotor hub
91
. A plurality of blades
92
are equi-spaced and welded on an outer circumference of the outer rotor
9
.
In order to rotate the outer rotor
9
in a balanced manner, the conventional blades
92
must be equi-spaced precisely around an outer periphery of the outer rotor
9
. Thereby, it can be seen that a need remains for recision instruments, such as a clamp, for finding out precise welding points of the blades
92
positioned on the outer circumference of the outer rotor
9
. In attempting to determine these welding points, assembly/manufacturing operations are sophisticated and time-wasting. Moreover, in an initial welding operation, no fixing support exists between any two welding points of the blades
92
and therefore a unilateral force biases the first welding of one of the blades
92
. The blade
92
is relatively shifted on the outer rotor
9
. Consequently, the combined blade and outer rotor member is unsymmetrical in structure and unbalanced in rotation so that the unsymmetrical blades cause vibration and noise.
The present invention intends to provide an outer rotor structure for an ac fan adapted to combine with metal blades in such a way to mitigate and overcome the above problem.
SUMMARY OF THE INVENTION
The primary objective of this invention is to provide an outer rotor structure for an ac fan adapted to combine with metal blades for convenient assembling and manufacture.
The secondary objective of this invention is to provide the outer rotor structure for the ac fan having assembling grooves to mount metal blades at predetermined positions and angles, thereby rotating the rotor in a stable and balanced manner.
The outer rotor structure for the ac fan in accordance with the present invention mainly comprises a plurality of annular pole plates used to stack on each other to form an outer rotor. Each of the pole plates includes an axial hole, a plurality of poles, at least one aligning member and a plurality of recessions. The aligning member is used to align the two adjacent pole plates for stacking so that the recessions of the pole plate are turned at a slight angle in stacked relationship with those of the adjacent pole plate. The longitudinally connected recessions are formed as a plurality of assembling grooves adapted to mount ends of metal blades therein at predetermined positions by welding.
Other objectives, advantages and novel features of the invention will become more apparent from the following detailed description and the accompanying drawings.
REFERENCES:
patent: 4130770 (1978-12-01), Wrobel
patent: 4395815 (1983-08-01), Stanley et al.
Horng Alex
Wu Wen-Shing
Lam Thanh
Sunonwealth Electric Machine Industry Co. Ltd.
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