Electrical generator or motor structure – Dynamoelectric – Reciprocating
Reexamination Certificate
2001-10-16
2003-09-30
Waks, Joseph (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Reciprocating
C310S012060
Reexamination Certificate
active
06628018
ABSTRACT:
TECHNICAL FIELD
The present invention relates a stator structure of a reciprocating motor, and more particularly, to a stator structure a reciprocating motor in which an area of a magnetic path is enlarged by increasing an area of an inner core where flux flows.
BACKGROUND ART
A general reciprocating motor has a plane form of magnetic flux compared to a general motor which has a cubic structure of magnetic flux. A flat armature is linearly moved on a plane according to variation of the magnetic flux formed on a fixing part.
FIGS. 1A and 1B
show an example of the reciprocating motor which includes a stator (S) having a hollow cylindrical outer core
10
and a hollow cylindrical inner core
20
inserted into the outer core
10
, a winding coil
30
coupled inside the outer core
10
, and an armature
40
having a permanent magnet
41
and movably inserted between the outer core
10
and the inner core
20
.
In the conventional reciprocating motor constructed as described above, when a current flows to the winding coil
30
, a flux is formed around the winding coil
30
. The flux forms a closed loop along the outer core
10
and the inner core
20
, and the permanent magnet
41
receives a force in the axial direction by a magnetic flux formed by the flux formed in the outer core
10
and the inner core
20
and the magnetic flux, that is, the interaction of the flux.
Then, as shown in
FIG. 2
, the armature
40
makes a linear movement in the axial direction between the outer core
10
and the inner core
20
. As the direction of the current applied to the winding coil
30
is changed in turn, the armature
40
undergoes a linear reciprocating movement.
The outer core
10
forms a stacked body that a plurality of thin lamination sheets
11
with a predetermined shape make a hollow cylindrical form.
In order to couple the winding coil
30
to the outer core
10
, a bobbin is used
50
in view of a simplicity of a production as well as for an electrical insulation.
The bobbin
50
is constructed that an annular groove at which a coil is wound is formed inside the coil winding part
51
formed in an annular shape to have a predetermined diameter and a terminal part
52
connected to an external power terminal part is formed at the side of the coil winding part
51
.
The winding coil
30
is wound in the annular bobbin
50
in multi-layers, and the wound coil is connected to the terminal part
52
.
The plurality of thin lamination sheets
11
constructing the outer core
10
are radially stacked to form a hollow cylindrical shape at the coil winding part
51
of the bobbin,
The inner core
20
forms a stacked body that a plurality of thin lamination sheets
21
having a predetermined form are radially stacked to form a hollow cylindrical shape. The inner core
20
formed as the stacked body is inserted inside the outer core
10
with a predetermined space therebetween.
The armature
40
includes a plurality of permanent magnets
41
coupled at equal intervals to the hollow cylindrical permanent magnet holder
42
. The armature
40
is inserted to be linearly movable between the outer core
10
and the inner core
20
.
When the reciprocating motor is driven, a flux flows to form a closed loop through the outer core
10
and the inner core, and at this time, if much load is taken to the motor, the amount of the flux is increased.
At this time, since the area of the magnetic path of the inner core
20
where the flux flows is smaller than that of the outer core
10
, if the motor is overloaded, a core saturation occurs.
Thus, in order to prevent the core saturation, the magnetic path of the inner core
20
, that is, the area where the flux flows, needs to be increased, for which the inner diameter of the inner core
20
may be reduced or the outer diameter of the inner core
20
may be increased.
As an example, as shown in
FIG. 3
, in case that the outer diameter of the inner core
20
is increased (from D
1
to D
2
), the volume of the armature
40
including the permanent magnet
41
and the outer core
10
is increased, resulting in an increase in the amount of the permanent magnets which would inevitably cause an increase in the production cost.
As another example, as shown in
FIG. 4
, in case that the inner diameter of the inner core
20
(from D
1
to D′
2
), there is a limitation to increase the area and the number of the thin lamination sheets
21
constructing the inner core
20
is reduced, resulting in that the area of the magnetic path is rather reduced.
Therefore, an object of the present invention is to provide a stator structure of a reciprocating motor in which the area of the magnetic path where a flux flows is maximized without increasing the overall volume of a reciprocating motor.
DISCLOSURE OF INVENTION
In order to achieve the above objects, there is provided a stator structure of a reciprocating motor including: a stator having a hollow cylindrical outer core and an inner core formed as a hollow cylindrical stacked body inserted inside the outer core; a winding coil coupled inside the outer core; and an armature with a permanent magnet attached to one side thereof movably inserted between the outer core and the inner core.
In order to achieve the above objects, there is further provided a stator structure of a reciprocating motor including: a stator having a hollow cylindrical outer core and an inner core inserted inside the outer core and having a plurality of overlap-type thin lamination sheets of which one side has a double faces and the other side has a single face are stacked in a hollow cylindrical form in a manner that the single face is positioned at the inner side and the double faces are positioned at the outer side; a winding coil coupled inside the outer core; and an armature with a permanent magnet attached at one side thereof, and movably inserted between the outer core and the inner core.
In order to achieve the above objects, there is further provided a stator structure of a reciprocating motor including: a stator having a hollow cylindrical outer core and an inner core inserted inside the outer core and consisting of a radially stacked part that a plurality of thin lamination sheets are radially stacked in a hollow cylindrical form and a plurality of annular lamination sheets with a predetermined width are stacked in a hollow and cylindrical form in the axial direction and combined in the inner circumferential face of the radially stacked part; a winding coil coupled inside the outer core; and an armature with a permanent magnet attached at one side thereof, and movably inserted between the outer core and the inner core.
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Hong Eon Pyo
Hur Kyung Bum
Kim Hyoung Jin
Lee Hyuk
Park Jung-Sik
LG Electronics Inc.
Waks Joseph
LandOfFree
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