Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2002-12-30
2004-01-06
Tamai, Karl (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S156120, C310S156290, C310S156140, C310S06800R
Reexamination Certificate
active
06674204
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention is related to a magnet-positioning device for a rotor and more particularly to the magnet-positioning device having assembling members adapted to combine a metal casing convenient with a rotor hub.
2. Description of the Related Art
A traditional fan rotor has a magnet and a metal casing attached thereto, which are embedded in a mold of a fan wheel. A hub of the fan wheel encompasses the magnet and the metal casing, and is integrally formed by plastic injection molding. In order to maintain balanced rotation of the fan wheel, the fan wheel, the magnet and the metal casing are formed as a singular member in the manufacturing process. However, in the mold assembly the fan wheel must be injected one at a time. If more than two fan wheels are injected at a time, the temperature in the mold cannot be controlled precisely due to the different temperatures of more than two sets of the magnet and the metal casing prior to being contained in the mold. The different temperatures in the mold result in different molding flow of plastic therein. This causes a fan wheel product mismatch. Consequently, the multi-molding process fails to accomplish the specific balancing rotation of each fan wheel manufactured by a single-molding process. Still, the single-molding process reduces manufacturing efficiency and increases manufacturing cost.
Referring to
FIG. 1
, a conventional fan wheel includes a rotor
90
, a hub
91
, and a plurality of resilient members
92
. Each end of the resilient members
92
is provided with an engaging hook
93
adapted to engage with a metal casing
94
, which is attached to a magnet. The resilient members
92
are integrally formed with the hub
91
so that a great many of the fan wheels may be injected at one time in the molding process. However, the resilient members
92
complicate the entire mold structure of the fan wheel and increase the manufacturing cost of the mold.
The present invention intends to provide a magnet-positioning device for a rotor having assembling members adapted to combine a metal casing with a rotor hub in such a way to mitigate and overcome the above problem.
SUMMARY OF THE INVENTION
The primary objective of this invention is to provide a magnet-positioning device for a rotor having assembling members adapted to combine a metal casing with a rotor hub.
The magnet-positioning device for the rotor in accordance with the present invention mainly comprises a rotor hub, a metal casing, and an annular magnet. The rotor hub includes an annular wall and an engaging portion formed thereon. The engaging portion is adapted to engage with the metal casing, which is integrally adhered with the annular magnet. The metal casing includes a first end edge and a second end edge, and an outer diameter formed by the second end edge is slightly greater than an inner diameter formed by the engaging portion.
Other objectives, advantages and novel features of the invention will become more apparent from the following detailed description and the accompanying drawings.
REFERENCES:
patent: 4682065 (1987-07-01), English
patent: 6050785 (2000-04-01), Horng
patent: 6109890 (2000-08-01), Horng
patent: 6307291 (2001-10-01), Iwaki
patent: 6396190 (2002-05-01), Ahn
patent: 6400053 (2002-06-01), Horng
patent: 6483209 (2002-11-01), Horng
Hong Yin-Rong
Horng Alex
Bacon & Thomas PLLC
Mohandesi Iraj A.
Sunonwealth Electric Machine Industry Co. Ltd.
Tamai Karl
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