Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2001-11-13
2004-03-02
Mullins, Burton (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S017000, C310S216006, C310S254100
Reexamination Certificate
active
06700286
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 simplifying the processing and the assembling of parts.
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 moving magnet 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
.
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 a cylindrical stacked core formed by radially stacking lamination sheets
11
, which are predetermined shaped thin plates.
When the winding coil
30
is combined with the outer core
10
, a bobbin
50
is used for forming the winding coil
30
in order to secure electrical insulation and the convenience of fabrication. The winding coil
30
is formed by winding coil around the ring-shaped groove of the bobbin
50
in multiple layers. Wound coil is connected to a terminal
51
.
A plurality of lamination sheets
11
formed of thin plates are radially stacked on the bobbin
50
to be cylindrical, to thus form the outer core
10
.
The inner core
20
is a stacked core formed by radially stacking a plurality of lamination sheets
21
formed of predetermined shaped thin plates to be cylindrical. The inner core
20
is inserted into the outer core
10
to be separated from the outer core
10
by a predetermined distance.
The moving magnet
40
is formed by combining the plurality of permanent magnets
41
with a cylindrical permanent magnet holder
42
such that the permanent magnets
41
are separated from each other by the same distance. The moving magnet
40
is inserted between the outer core
10
and the inner core
20
to be in a linear motion.
When the reciprocating motor is loaded in another system, the stator, that is, the outer core
10
and the inner core
20
are fixed to and combined with the system.
FIG. 3
shows an example of a conventional structure, in which the inner core
20
is combined with a frame that forms the system, between the stacked cores that form the stator, that is, the outer core
10
and the inner core
20
.
As shown in
FIG. 3
, ring-shaped inserting grooves a of a predetermined width and a predetermined depth are respectively formed in both sides of a cylindrical stacked core E formed by stacking the plurality of lamination sheets
21
. Ring-shaped fixing rings
22
are press fitted in the inserting grooves a.
The frame
60
includes a base
61
formed to have a predetermined shaped area and a cylindrical loading portion
62
extendedly formed in the middle of the base
61
to have a predetermined length. The cylindrical stacked core E is press fitted in and combined with the outer circumference of the loading portion
62
of the frame
60
.
The inserting grooves a formed in the cylindrical stacked core E are formed by forming grooves in both sides of the lamination sheets
21
that form the cylindrical stacked core E and stacking the lamination sheets
21
, in which the grooves are formed, to be cylindrical.
The fixing rings
22
are formed to have the section corresponding to the section of the inserting grooves a and the diameter equal to the diameter of the inserting grooves a.
The fastening strength of the cylindrical stacked core E formed by stacking the plurality of lamination sheets
21
and the press fit strength between the cylindrical stacked core E and the frame
60
is determined by the processing precision of the fixing rings
22
.
That is, when the degree of precision between the fixing rings
22
and the inserting grooves a is low, the fastening strength of the cylindrical stacked core E is low and the combination strength between the cylindrical stacked core E and the frame
60
is low. Therefore, the cylindrical stacked core E easily drifts away from the frame
60
.
When the degree of precision between the fixing rings
22
and the inserting grooves a is high, the fastening strength of the cylindrical stacked core E is high and the cylindrical stacked core E is press fitted in the frame
60
. In this case, when the cylindrical stacked core E is combined with the frame
60
, parts are transformed or scratched.
As mentioned above, in the conventional combination structure of the stacked core that is the cylindrical stacked core E, the processing of the fixing rings
22
and the processing of the loading portion
62
of the frame
60
must be precise in order to maintain the fastening strength of the cylindrical stacked core E and the combination strength between the cylindrical stacked core E and the frame
60
to be appropriate. Accordingly, the processing expenses are high and the assembly productivity is deteriorated.
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 simplifying the processing and the assembling of parts.
One or more of these and other objects of the present invention are accomplished by a stator structure for a reciprocating motor, said stator structure comprising a cylindrical, stacked core having a plurality of lamination sheets, wherein each of said lamination sheets extends radially and axially with respect to a longitudinal centerline of said cylindrical, stacked core: a plurality of hanging grooves, wherein each of said hanging grooves includes a receiving groove and a settling groove being recessed and formed within said receiving groove, and at least one of said hanging grooves is respectively provided for each of said lamination sheets; and an elastic ring being elastically inserted into and secured within said hanging grooves for securing said lamination sheets to said cylindrical, stacked core.
One or more of these and other objects of the present invention are also accomplished by a reciprocating motor having a stator structure, a winding coil combined with said stator structure, and a moving magnet between an inner core and an outer core of said stator structure, said stator structure comprising a cylindrical, stacked core having a plurality of lamination sheets, wherein each of said lamination sheets extends radially and axially with respect to a longitudinal centerline of said cylindrical, stacked core; a plurality of hanging grooves, wherein each of said hanging grooves includes a receiving groove and a settling groove being recessed and formed within said receiving groove, an
Birch & Stewart Kolasch & Birch, LLP
LG Electronics Inc.
Mullins Burton
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