Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2001-10-17
2004-11-02
Mullins, Burton S. (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S194000
Reexamination Certificate
active
06812606
ABSTRACT:
TECHNICAL FIELD
The present invention relates a reciprocating motor for use in a reciprocating compressor, and more particularly, to a reciprocating motor in which an armature (a moving element) positioned between stators undergoes a linear reciprocating movement.
BACKGROUND ART
In general, a reciprocating motor is an apparatus for generating a driving force as an armature undergoes a linear reciprocating movement by a flux formed around a winding coil when a current is applied to the winding coil at the side of the stators.
FIG. 1
is a side view of a reciprocating motor in accordance with a conventional art, and
FIG. 2
is a sectional view in the direction of A—A line of FIG.
1
.
The reciprocating motor roughly includes stators
10
forming a flux when a current is applied thereto from an external source, and an armature
15
positioned in the stators
10
, undergoing a linear reciprocating movement by virtue of the flux generated around the stators.
The stators
10
includes a cylindrical outer core
20
, an inner core
25
positioned inside the outer core and a winding coil
30
installed at an inner side of the outer core
20
or the inner core
25
, to which a current is applied from an external source.
The outer core
20
is formed cylindrical as a plurality of lamination sheets
21
are radially stacked, and the inner core
25
is formed also cylindrical as a plurality of lamination sheets
26
are radially stacked.
The lamination sheets
21
are mutually fixed by a fixing ring
23
connected to the side thereof.
The winding coil
30
is installed at one of the outer core
20
and the inner core
25
and constructed such that a coil is wound within a bobbin
35
made of an insulation material so as to be insulated with the outer core
20
or the inner core
25
where the flux is formed.
The bobbin
35
is formed in a hollow ring shape and includes a winding part
36
in which the coil is wound and a terminal part
37
protruded from one side of the winding part
36
and press-ft with a wire so that the winding coil
30
can be connected to an external power source.
A connector
38
is provided at the end of the terminal part
37
so as to be easily connected to the external power source.
The armature
15
includes a cylindrical movable cylinder
16
inserted between the outer core
20
and the inner core
25
and linearly moved to transmit a driving force and a plurality of permanent magnets
18
mounted at the moving cylinder
16
, for generating a mutual interaction force with a flux generated when a current is applied to the winding coil
30
.
In the reciprocating motor constructed as described above, when a current is applied to the winding coil
30
, a flux is formed around the winding coil
30
, which flows forming a closed loop along the outer core
20
and the inner core
25
.
At this time, as a mutual interaction force is generated between the flux flowing to the outer core
20
and the inner core
25
and the magnetic flux formed by the permanent magnet
18
, the armature
15
including the permanent magnet receives a force in the axial direction, and undergoes a linear movement.
Accordingly, in the reciprocating motor, when the direction of the current applied to the winding coil
30
is changed in turn, the armature
15
continuously undergoes a linear movement between the stators
10
and generates a reciprocating movement force.
FIG. 3
is a schematic view showing an assembly structure that lamination sheets are stacked centering around a bobbin, and
FIG. 4
is an enlarged view of a portion ‘B’ of
FIG. 1
showing how the lamination sheets and the terminal part contact each other.
With reference to
FIG. 3
, the lamination sheets
21
of the outer core
20
are successively stacked around the winding part
36
of the bobbin
35
.
Especially, the lamination sheets
21
is formed in an ‘L’ shape with the side portion
21
a
and the upper portion
21
b
integrally formed. The lamination sheets
21
and
21
′ are stacked in turn at the left side and the right side to make a cylindrical structure.
Accordingly, as shown in
FIG. 4
, though the outer diameter side ‘H’ of the outer core
20
is fixed through a fixing ring
23
in a state that the outer peripheral portions
221
b
of the lamination sheets
21
mutually contact closely, there is a gap between the lamination sheets
21
at the inner diameter side (I) of the core.
The terminal part
37
of the bobbin
35
is formed in a fan shape such that it is gradually widened as it goes from the inner diameter side of the outer core to the outer diameter side so that the laminations sheets
21
can be densely stacked in a cylindrical form.
In the outer core
20
formed as the lamination sheets
21
are stacked centering around the bobbin
35
, when a current is applied to the winding coil
30
and a flux is formed, electromagnetic force is generated between the lamination sheets
21
, so that the lamination sheets
21
at the side of the inner diameter (I) are vibrated.
At this time, since a mutual repulsive pulse is generated between the mutually adjacent lamination sheets
21
in terms of the magnetic circuit structure, the lamination sheets
21
do not collide with each other.
However, in case of the lamination sheet
21
adjacent to the terminal part
37
of the bobbin
35
, since the lamination sheet
21
″ collides with the terminal part
37
while being vibrated, a collision noise is generated from the portion ‘K’ of
FIG. 4
, and in the worst case, it deteriorates a durability so that an operational efficiency of the motor is degraded or causes an occurrence of breakdown.
DETAILED DESCRIPTION OF THE INVENTION
Therefore, an object of the present invention is to provide a reciprocating motor which is capable of preventing a lamination sheet from vibrating during operation of a motor so that interference between elements such as the lamination sheet and a terminal is prevented to reduce a collision noise and damage to components and heighten a reliability in operation of the motor.
In order to achieve the above objects, there is provided a reciprocating motor including: a bobbin in which a coil is wound; a terminal part formed at one side of the bobbin to electrically connect the coil and an external circuit; a core part at which a plurality of lamination sheets are radially stacked in the circumferential direction centering around the bobbin; and a fixing part for fixing at least one of lamination sheets at the side of the core part.
REFERENCES:
patent: 3716733 (1973-02-01), Keith et al.
patent: 3902087 (1975-08-01), Hakamada et al.
patent: 4169234 (1979-09-01), Yonkers
patent: 5844332 (1998-12-01), Lee
patent: 6181038 (2001-01-01), Van Rooij
patent: 6265802 (2001-07-01), Getschmann
patent: 6315168 (2001-11-01), Bolyard et al.
patent: 2000-166189 (2000-06-01), None
patent: 02001037114 (2001-02-01), None
patent: WO 00/62406 (2000-10-01), None
Bae Gyoo-Jong
Heo Jong-Tae
Hur Kyung Bum
Kang Kyung-Seok
Birch & Stewart Kolasch & Birch, LLP
Jones Judson H.
LG Electronics Inc.
Mullins Burton S.
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