Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2001-11-13
2004-08-24
Nguyen, Tran (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S156530, C310S156560, C310S211000
Reexamination Certificate
active
06781274
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a synchronous motor, and more particularly to a rotor of a synchronous motor and a method for manufacturing the same.
2. Description of the Related Art
A synchronous motor is a kind of alternate current motor. It has a stabilized rotating characteristic by being synchronized with an input frequency. It also can change a rotation frequency of the motor by changing a power frequency.
FIG. 1
is a longitudinal sectional view of a conventional rotor of a synchronous motor. Referring to
FIG. 1
, the rotor
20
includes an iron core
22
and an aluminum bar
21
passing through the iron core
22
permitting an induced current to flow easily from a stator (not shown).
The iron core
22
is made of a plurality of laminated thin iron sheets
10
. One of the thin iron sheets
10
is shown in
FIG. 2. A
shaft hole
11
is formed at a center of the thin iron sheets
10
for receiving a rotating shaft (not shown). A plurality of aluminum-inserting holes
12
are radially formed around the outer circumference of the thin iron sheets
10
.
The aluminum bar
21
is formed by ingoting aluminum material into the aluminum-embracing holes
12
at the iron core
22
formed of the laminated plurality of iron sheets
10
.
When an induced current is transferred from a winding coil (not shown) to the stator (not shown) through the above construction, the rotor
20
receives the induced current from the aluminum bar
21
and rotates with a rotary shaft (not shown) connected thereto.
Furthermore, for the conventional rotor
20
of a synchronous motor, there is a limit to improve a rotating force of the motor only with the aluminum bar
21
. Therefore, to improve the capability of the motor, one or more magnets (not shown) are disposed inside or on an outer circumference of the rotor
20
. In addition, if the magnet is disposed inside of the rotor
20
, the magnet should be settled using a metal can (not shown) and a rivet (not shown) for preventing the magnet from being separated while being rotated.
However, if the metal can and the rivet are used for settling the magnet, manufacturing procedure can be extended by many steps for producing the rotor
20
, thus it can deteriorate the manufacturing capacity.
SUMMARY OF THE INVENTION
The present invention has been made to overcome the above-mentioned problems of the related art. Accordingly, it is an object of the present invention to provide a rotor of a synchronous motor and a method of manufacturing the same capable of shortening a manufacturing procedure and at the same time improving the capability of the motor.
The rotor of the synchronous motor according to the present invention to accomplish the above object, comprises a main core having a hole at a center for embracing a rotating shaft. The main core is formed from a plurality of laminated thin iron sheets that have a number of magnet holes and induced conductor holes radially disposed therein at a predetermined space differently from the hole. A predetermined number of magnets are inserted into the magnet holes of the main core. Supplementary cores, having a hole and an induced conductor hole at the corresponding place to the hole and the induced conductor hole of the main core, are disposed at the ends of the main core that the magnet is inserted therein. An induced conductor is formed by ingoting through the induced conductor holes of the main core and the same of the supplementary cores.
Also, the method of manufacturing the rotor of the synchronous motor of the present invention includes the steps of constructing a main core, having a hole at a center for embracing a rotating shaft, formed from a plurality of laminated thin iron sheets that a number of magnet holes and induced conductor holes radially disposed therein at a predetermined space differently from the hole; inserting magnets into the magnet holes of the main core; disposing a supplementary cores, having a hole and an induced conductor holes at the corresponding place to the hole and the induced conductor holes of the main core, at the ends of the main core; and ingoting an induced conductor through the induced conductor holes of the main core and the same of the supplementary cores.
REFERENCES:
patent: 2944171 (1960-07-01), Alger
patent: 3590208 (1971-06-01), Martini et al.
patent: 4144469 (1979-03-01), Miyashita et al.
patent: 4188554 (1980-02-01), Binns
patent: 4403161 (1983-09-01), Miyashita et al.
patent: 4469970 (1984-09-01), Neumann
patent: 4728842 (1988-03-01), Martin
patent: 5097166 (1992-03-01), Mikulic
patent: 5142178 (1992-08-01), Kloster et al.
Hong Sik Jeong
Moy Jeffrey D.
Nguyen Tran
Weiss Harry M.
Weiss, Moy & Harris P.C.
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