Electrical generator or motor structure – Dynamoelectric – Linear
Reexamination Certificate
2001-11-13
2003-06-03
Tamai, Karl (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Linear
C310S254100, C310S091000, C310S058000, C310S085000, C310S089000, C310S071000, C029S596000, C029S606000, C264S272200
Reexamination Certificate
active
06573624
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a stator structure of a reciprocating motor, and more particularly, to a stator structure of a reciprocating motor, which is capable of reducing the number of parts, and of simplifying assembly of the structure.
2. Description of the Background Art
In general, a reciprocating motor is formed by making the flux of a common three-dimensional motor plane. A plane moving part linearly moves on a plane according to a change in the flux formed on a plane fixed part. The reciprocating motor according to the present invention can be in a linear reciprocating motion by attaching a plurality of plane magnets to the cylindrical circumference of a stator by applying the above principle.
FIGS. 1 and 2
respectively show an example of the reciprocating motor. As shown in
FIGS. 1 and 2
, the reciprocating motor includes a stator S consisting of a cylindrical outer core
10
and a cylindrical inner core
20
, which is inserted into the outer core
10
, a winding coil
30
combined with the outer core
10
or the inner core
20
inside the outer core
10
or the inner core
20
, and a moving magnet
40
, which includes permanent magnets
41
, and is inserted between the outer core
10
and the inner core
20
to be movable. In
FIGS. 1 and 2
, the winding coil is combined with the outer core.
In the above-mentioned reciprocating motor, when current flows through the winding coil
30
, flux is formed around the winding coil
30
due to the current that flows through the winding coil
30
. The flux forms a closed loop along the outer core
10
and the inner core
20
, which form the stator S.
Because the permanent magnets
41
receive force in an axial direction due to the mutual action between the flux formed in the outer core
10
and the inner core
20
and the flux formed by the permanent magnets
41
, the moving magnet
40
is in a linear motion in the axial direction between the outer core
10
and the inner core
20
. When the direction of the current applied to the winding coil
30
is alternately changed, the moving magnet
40
is in a linear reciprocating motion.
The outer core
10
is comprised of cylindrical stacked core members formed by radially stacking lamination sheets
11
, which are thin plates of a predetermined shape. The stacked core members are fixed by a fixing ring
12
.
The cylindrical stacked core members consists of a path a, whose section is U-shaped, and triangular poles b formed in both ends of the path a. The winding coil
30
is positioned inside an opening groove H formed by the poles b and the path a. A bobbin
50
is used for forming the winding coil
30
in order to secure electrical insulation and for the convenience of fabrication. The winding coil
30
is formed by winding a coil around the bobbin
50
in multiple layers. The inner core
20
is comprised of cylindrical stacked core members formed by radially stacking lamination sheets
21
, which thin plates having a predetermined shape. Because the length of the permanent magnets
41
is determined by the length of the poles b and the width of the opening groove H and the permanent magnets
41
are expensive, the poles b that determine the width of the opening groove H are triangular and the ends of the poles b form poles in order to minimize the use of the permanent magnets
41
.
However, according to the above structure, because the plurality of lamination sheets
11
must be radially stacked to be cylindrical in fabricating the outer core
10
including the winding coil
30
, it takes a long time to stack the lamination sheets
11
. Also, because the stacked core members are fixed by the fixing ring
12
after being stacked, it takes a long time to assemble the outer core
10
. Accordingly, assembly productivity deteriorates.
Also, because the outer core
10
is assembled by press fitting the fixing ring
12
in the stacked core members formed by stacking the plurality of lamination sheets
11
, it is difficult to control the assembly strength of the stacked core members and to precisely process the fixing ring
12
.
SUMMARY OF THE INVENTION
Therefore, an object of the present invention is to provide a stator structure of a reciprocating motor, which is capable of reducing the number of parts, and of simplifying an assembly structure.
To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described herein, there is provided a stator structure of a reciprocating motor, in which a bobbin
50
around which a coil
30
is wound; a plurality of unit stacked core members
61
of a predetermined thickness, each of which is formed by stacking a plurality of lamination sheets L and L′ formed of predetermined shaped thin plates, and radially positioned on the outer circumference of the bobbin
50
; and an injected insulator
70
combining the plurality of unit stacked core members
61
to an outer circumference of the bobbin
50
.
The foregoing and other objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings.
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Birch & Stewart Kolasch & Birch, LLP
El-kassabgi Heba Yousri M.
LG Electronics Inc.
Tamai Karl
LandOfFree
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