Title of Invention	A STATOR FOR A RECIPROCATING MOTOR
Abstract	A stator of a reciprocal motor comprises a bobbin 500 of insulating material on which a coil 510 is wound; a terminal portion formed integrally with the bobbin 510 for electrically connecting the coil 510 to an outer electric source; a first lamination core 600 in which a plurality of lamination sheets 610 formed as thin plates having predetermined shapes are laminated in radial direction along with the bobbin 500; and a second lamination core 700, in which a plurality of lamination sheets 710 having predetermined area and length and having symmetric structure in up-and-down direction for a center line of length direction are laminated in radial direction to make a cylinder shape, coupled to the first lamination core 600 to be located on inner or outer side of the first lamination core 600 whereby the present invention makes the laminating operation simple and convenient.

Title of Invention

A STATOR FOR A RECIPROCATING MOTOR

Abstract

A stator of a reciprocal motor comprises a bobbin 500 of insulating material on which a coil 510 is wound; a terminal portion formed integrally with the bobbin 510 for electrically connecting the coil 510 to an outer electric source; a first lamination core 600 in which a plurality of lamination sheets 610 formed as thin plates having predetermined shapes are laminated in radial direction along with the bobbin 500; and a second lamination core 700, in which a plurality of lamination sheets 710 having predetermined area and length and having symmetric structure in up-and-down direction for a center line of length direction are laminated in radial direction to make a cylinder shape, coupled to the first lamination core 600 to be located on inner or outer side of the first lamination core 600 whereby the present invention makes the laminating operation simple and convenient.

Full Text	A STATOR FOR A RECIPROCATING MOTOR TECHNICAL FIELD The present invention relates to a stator for a reciprocating motor, and particularly, to a stator for a reciprocating motor of which components can be fabricated in simple way. BACKGROUND ART Generally, a motor is a device for changing electric energy into kinetic energy, and can be classified into a rotary motor changing the electric energy into rotating movements and a reciprocating motor changing the electric energy into linear reciprocating movements. The motor can be used in various fields as a power source. Especially, the above motor is applied to most electric devices such as refrigerator, air conditioner, etc. In the refrigerator and the air conditioner, the motor is used to rotate a blast fan, however, it can be also used as a power source by being mounted on a compressor of cooling cycle device included in the refrigerator and the air conditioner. Figures 1 and 2 are showing an example of a reciprocating motor under development by the present applicant. As shown therein, the reciprocating motor comprises: a bobbin 100 of ringular shape having a coil 110 wound therein; a terminal portion formed on one side of the bobbin 100 for electrically connecting the coil 110 wound in the bobbin 100 to outer electric source; an outer core 200 in which a plurality of lamination sheets 210 which are thin plates of U-shape are laminated in radial direction so as to make a cylindrical shape centering around the bobbin 100; an inner core 300, in which a plurality of lamination sheets 310 having predetermined area and length, and having asymmetric upper and lower parts centering around length direction are laminated in radial direction so as to make a cylinder shape, inserted into the outer core 200; and an armature 400 inserted between the outer core 200 and the inner core 300. The outer core 200 and the inner core 300 including the bobbin 100 construct a stator (S). On the other hand, the inner core 200 may be located on outer side of the outer core 200. That is, the bobbin 100 is located on the inner core 300 side, and the bobbin 100 may not be included in the outer core 200. The lamination sheets 210 constructing the outer core 200 are laminated so that the bobbin 100 can be inserted into opening recess (H) formed inside of the lamination sheet 210. In addition, both ends of the lamination sheet 210 are pole portion 211 forming the poles, and remained part is path portion 212 on which flux flows. The lamination sheet 310 constructing the inner core 300 is formed to have long portion facing the lamination sheet 210 of the outer core 200, short opposite portion, and coupling recesses 311 with opened ends formed on both end portions of the lamination sheet. The armature 400 comprises a magnet holder 410 of cylindrical shape and a plurality of permanent magnets 420 fixedly coupled on an outer circumferential surface of the magnet holder 410. In addition, as shown in Figure 3, a laminated body (L) which is made by laminating the plurality of lamination sheets 310 in radial direction to make a cylinder shape is fixedly coupled by press-fitting a fixing ring 312 of ringular shape into a ring coupled recess 311 of ringular shape formed by a concave recess of the lamination sheets. Unexplained reference numeral 220 represents a fixing ring of the outer core. As shown in Figure 4, when electric current is flowed on the winding coil 110, a flux is formed around the winding coil 110 by the electric current flowing on the winding coil 110, and the flux flows along with the outer core 200 and the inner core 300 as forming a closed loop. The armature 400 is moved toward a center axis direction by an interaction between the flux caused by the current flowing on the winding coil 110 and the permanent magnet 420 constructing the armature 400. In addition, when the direction of electric current flowing on the winding coil 110 is changed, the direction of the flux formed on the outer core 200 and the inner core 300, and the armature 400 moves toward opposite direction. When the electric current is supplied as changing its direction, the armature 400 undergoes linear reciprocating movements between the outer core 200 and the inner core 300. Accordingly, the armature 400 is to have linear reciprocating power. On the other hand, since the outer core 200 and the inner core 300 making the stator (S) are constructed by the laminated body of the plurality of lamination sheets, the loss of flux flowing on the stator can be reduced. However, according to the above conventional structure, when the stator (S) is fabricated, the lamination sheet 310 constructing the inner core 300 in the stator (S) is formed as an asymmetric shape for a center line in length direction, and therefore, the directions of the lamination sheets 310 should be coincided and laminated in laminating the plurality of lamination sheets 310 as a cylinder shape. Thus, the laminating operation is complex, and productivity is lowered and it is not suitable for mass production. TECHNICAL GIST OF THE PRESENT INVENTION Therefore, an object of the present invention is to provide a stator for a reciprocating motor of which components can be fabricated in simple way and assembling property can be improved. In order to achieve the above objects, there is provided a stator for a reciprocating motor comprising: a bobbin of insulating material on which a coil is wound; a terminal portion formed integrally with the bobbin for electrically connecting the coil to outer electric source; a first lamination core in which a plurality of lamination sheets formed as thin plates of predetermined shape are laminated in radial direction along with the bobbin; and a second lamination core, in which a plurality of lamination sheets formed to have predetermined area and length and formed to have symmetric upper and lower sides for a center line of length direction are laminated in radial direction to make a cyJinder shape, coupled to the first lamination core to be located on inner or outer side of the first lamination core. Accordingly, the present invention provides a stator for a reciprocating motor comprising: a bobbin of insulating material on which a coil is wound; a terminal portion formed integrally with the bobbin for electrically connecting the coil to an outer electric source; a first lamination core in which a plurality of lamination sheets formed as thin plates having predetermined shapes are laminated in radial direction along with the bobbin; and a second lamination core, in which a plurality of lamination sheets having predetermined area and length and having symmetric structure in up-and-down direction for a center line of length direction are laminated in radial direction to make a cylinder shape, coupled to the first lamination core to be located on inner or outer side of the first lamination core and formed by forming a square plate body portion of rectangular shape having a predetermined area and length, and by forming ring insertion recesses having predetermined width and depth on both ends of a center in length direction of the square plate body portion. BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS Figure 1 is a front cross-sectional view showing a reciprocating motor under development; Figure 2 is a side view showing the reciprocating motor under development; Figure 3 is a perspective view showing an inner core constructing the reciprocating motor under development; Figure 4 is a front cross-sectional view showing operational status of the reciprocating motor under development; Figure 5 is a front cross-sectional view showing a reciprocating motor including a stator according to the present invention; Figure 6 is a perspective view showing the stator of the reciprocating motor according to the present invention; Figure 7 is a front view showing another example of a lamination sheet constructing the stator of the reciprocating motor according to the present invention; and Figure 8 is a cross-sectional view showing another embodiment of the reciprocating motor according to the present invention. MODE FOR CARRYING OUT THE PREFERRED EMBODIMENTS Figures 1 and 2 show an example of a reciprocating motor under development by the present applicant. As shown therein, the reciprocating motor comprises: a bobbin 100 of ringular shape having a coil 110 wound therein; a terminal portion formed on one side of the bobbin 100 for electrically connecting the coil 110 wound in the bobbin 100 to outer electric source; an outer core 200 in which a plurality of lamination sheets 210 which are thin plates of U-shape are laminated in radial direction so as to make a cylindrical shape centering around the bobbin 100; an inner core 300, in which a plurality of lamination sheets 310 having predetermined area and length, and having asymmetric upper and lower parts centering around length direction are laminated in radial direction so as to make a cylinder shape, inserted into the outer core 200; and an armature 400 inserted between the outer core 200 and the inner core 300. The outer core 200 and the inner core 300 including the bobbin 100 construct a stator (S). On the other hand, the inner core 200 may be located on outer side of the outer core 200. That is, the bobbin 100 is located on the inner core 300 side, and the bobbin 100 may not be included in the outer core 200. The lamination sheets 210 constructing the outer core 200 are laminated so that the bobbin 100 can be inserted into opening recess (H) formed inside of the lamination sheet 210. In addition, both ends of the lamination sheet 210 are pole portion 211 forming the poles, and remaining part is path portion 212 on which flux flows. The laminated sheet 310 constructing the inner core 300 is formed to have long portion facing the lamination sheet 210 of the outer core 200, short opposite portion, and coupling recesses 311 with opened ends formed on both end portions of the laminated sheet. The armature 400 comprises a magnet holder 410 of cylindrical shape and a plurality of permanent magnets 420 fixedly coupled on an outer circumferential surface of the magnet holder 410. In addition, as shown in Figure 3, a laminated body (L) which is made by laminating the plurality of lamination sheets 310 in radial direction to make a cylindrical shape is fixedly coupled by press-fitting a fixing ring 312 of ringular shape into a ring coupled recess 311 of ringular shape formed by a concave recess of the lamination sheets. Unexplained reference numeral 220 represents a fixing ring of the outer core. As shown in Figure 4, when electric current flows on the winding coil 110, a flux is formed around the winding coil 110 by the electric current flowing on the winding coil 110, and the flux flows along with the outer core 200 and the inner core 300 as forming a closed loop. The armature 400 is moved toward a center axis direction by an interaction between the flux caused by the current flowing on the winding coil 110 and the permanent magnet 420 constructing the armature 400. In addition, when the direction of electric current flowing on the winding coil 110 is changed, the direction of the flux formed on the outer core 200 and the inner core 300, and the armature 400 moves towards opposite direction. When an electric current is supplied as changing its direction, the armature 400 undergoes linear reciprocating movements between the outer core 200 and the inner core 300. Accordingly, the armature 400 is to have linear reciprocating power. On the other hand, since the outer core 200 and the inner core 300 making the stator (S) are constructed by the laminated body of the plurality of lamination sheets, the loss of flux flowing on the stator can be reduced. However, according to the above conventional structure, when the stator (S) is fabricated, the lamination sheet 310 constructing the inner core 300 in the stator (S) is formed as an asymmetric shape for a center line in length direction, and therefore, the directions of the lamination sheets 310 should be coincided and laminated in in laminating the plurality of lamination sheets 310 as a cylinder shape. Thus, the laminating operation is complex, and productivity is lowered and it is not suitable for mass production. The present invention will now be described with reference to the accompanying drawings. Figure 5 shows a reciprocating motor including an embodiment of a stator according to the present invention. As shown therein, in the reciprocating motor, a terminal portion 520 for electricaiiy connecting a coil 510 to outer electric source is formed integrally on an insulating bobbin 500 on which a coil 510 is wound. In addition, a first lamination core 600 is coupled to outer side of the bobbin 500, and the first lamination core 600 is a laminated body in which a plurality of lamination sheets 610 formed as thin plates of U-shape are laminated in radial direction along with the bobbin 500. The plurality of lamination sheets 610 constructing the first lamination core 600 are laminated from one side surface of the terminal portion 520 to another side surface of the terminal portion 520 so that the bobbin 500 can be inserted into an opened recess (H) formed in the lamination sheets 610. In addition, both ends of the lamination sheets 510 become a pole portion 611, and remained part becomes a path portion 612 on which the flux flows. In addition, a second lamination core 700 is inserted into the first lamination core 600 with a predetermined gap therebetween. As shown in Figure 6, the second lamination core 700 comprises a laminated body L' which is made by laminating a plurality of lamination sheets 710, of which upper and lower sides are formed to have symmetric structure for center line in length direction, in radial direction to make a cylinder shape, and a fixing ring 720 for fixing the laminated body L'. Also, the lamination sheet 710 constructing the second lamination core 700 is formed to have symmetric structure in left-and-right sides based on a vertical center line for the length direction. The lamination sheet 710 constructing the second lamination core 700 is made by forming a square plate body portion 711 of rectangular shape having a predetermined area and length, and forming ring insertion recesses 712 having predetermined width and depth on both ends of a center line in length direction of the square plate body portion 711. The lamination sheets 710 are laminated in radial direction to make a cylindrical shape, and after that, the fixing ring 720 of ringular shape is press- fitted into a recess of ringular shape formed by the ring insertion recesses 712 of the plurality of lamination sheets 710. Also, as another example of the second lamination core 700, the lamination sheet 730 may be formed by a square plate body portion 731 of rectangular shape having a predetermined area and length, ring insertion recesses 732 formed on both ends of a center in length direction of the square plate body portion 731 to have a predetermined width and depth, and a cut recesses 733 formed on upper and lower sides of the ring insertion recesses 732 respectively to make corners of the square plate body portion 731 be acute angles, as shown in Figure 7. It is desirable that the cut recesses 733 are formed as triangles. In addition, an armature 800 is inserted between the first lamination core 600 and the second lamination core 700. The armature 800 comprises a magnet holder 810 formed as a cylinder and a plurality of permanent magnets 820 fixedly coupled on an outer circumferential surface of the magnet holder 810. Also, as another embodiment of the present invention, the stator for the reciprocating motor comprises: a bobbin 500 of insulating material on which a coil 510 is wound; a terminal portion 520 formed integrally with the bobbin 500 for electrically connecting the coil 510 to outer electric source; a first lamination core 600 in which a plurality of lamination sheets 510 formed as thin plates of predetermined shapes are laminated in radial direction along with the bobbin 500; and a second lamination core 700, in which a plurality of lamination sheets 710 having predetermined area and length and having symmetric structure in up-and-down direction for a center line of length direction are laminated in radial direction to make a cylinder shape, coupled to the first lamination core 600 to be located on outer side of the first lamination core 600, as shown in Figure 8. That is, the first lamination core 600 is inserted into the second lamination core 700 with a predetermined gap therebetween. Also, left and right sides of the lamination sheet 710 constructing the second lamination core 700 is formed to be symmetric based on a vertical center line for the length direction. That is, the lamination sheet 710 constructing the second lamination core 700 is formed by a square plate body portion 711 of rectangular shape having predetermined area and length, and by ring insertion recesses 712 having a predetermined width and depth formed on both ends of the center in length direction of the square plate body portion 711. In addition, the armature 800 is inserted between the first lamination core 600 and the second lamination core 700. Hereinafter, operation and effect of the stator for the reciprocating motor will be described as follows. When the electric current is flowed on the winding coil 510 located in the bobbin 500, the flux flows along with the first lamination core 600 and the second lamination core 700 by the current flowing on the winding coil 510 as forming a closed loop. The armature is moved toward the center axis by an interaction between the flux caused by the electric current flowing on the winding coil 510 and the permanent magnets 820 constructing the armature 800. In addition, when direction of the electric current flowing on the winding coil 510 is changed, direction of the flux formed on the first lamination core 600 and the second lamination core 700 is changed, and therefore, the permanent magnets 820 are moved toward opposite direction. As described above, when the electric current is supplied as changing its direction, the armature 800 undergoes linear reciprocating movements between the first lamination core 600 and the second lamination core 700. On the other hand, since the plurality of lamination sheets 710 constructing the second lamination core 700 are formed to have symmetric structure in up-and-down, and left-and-right directions on the basis of the center line in length direction, the lamination sheets 710 do not have directional property when the sheets are laminated in radial direction, and therefore, the lamination sheets 710 can be laminated without arranging them in a predetermined direction. In addition, in case of the second lamination core 700 in which a plurality of lamination sheets 730 having cut recesses 733 are laminated shown in Figure 7, the flow of flux which is induced through the pole portion 611 of the first lamination core 611 can be smooth due to the form property. INDUSTRIAL APPLICABILITY As so far described, according to the stator for reciprocating motor of the present invention, a plurality of lamination sheets constructing the radial laminated body are constructed so that the upper and lower sides of the sheets are symmetric for the center line in length direction, and therefore, the plurality of lamination sheets can be laminated without arranging them toward a certain direction. Thus, the laminating operation can be made simply and conveniently to improve the assembling productivity, and to increase mass productivity. WE CLAIM : 1. A stator for a reciprocating motor comprising: a bobbin 500 of insulating material on which a coil 510 is wound; a terminal portion formed integrally with the bobbin 510 for electrically connecting the coil 510 to an outer electric source; a first lamination core 600 in which a plurality of lamination sheets 610 formed as thin plates having predetermined shapes are laminated in radial direction along with the bobbin 500; and a second lamination core 700, in which a plurality of lamination sheets 710 having predetermined area and length and having symmetric structure in up-and- down direction for a center line of length direction are laminated in radial direction to make a cylinder shape, coupled to the first lamination core 600 to be located on inner or outer side of the first lamination core 600 and formed by forming a square plate body portion of rectangular shape having a predetermined area and length, and by forming ring insertion recesses 712 having predetermined width and depth on both ends of a center in length direction of the square plate body 711 portion. 2. The stator as claimed 1, wherein upper and lower sides of the second lamination sheet 710 constructing the second lamination core 700 are formed to be symmetric based on a vertical center line for length direction. 3. The stator as claimed 1, wherein the lamination sheet 710 of the second lamination core 700 comprises a square plate body 711 portion rectangular shape having a predetermined area and length, ring insertion recesses 712 having predetermined width and depth formed on body ends of a center in length direction of square plate body 711 portion, and cut recesses formed on upper and lower sides of the ring insertion recesses 712 respectively for making corners of the square plate body 711 portion be acute angles. A stator of a reciprocal motor comprises a bobbin 500 of insulating material on which a coil 510 is wound; a terminal portion formed integrally with the bobbin 510 for electrically connecting the coil 510 to an outer electric source; a first lamination core 600 in which a plurality of lamination sheets 610 formed as thin plates having predetermined shapes are laminated in radial direction along with the bobbin 500; and a second lamination core 700, in which a plurality of lamination sheets 710 having predetermined area and length and having symmetric structure in up-and-down direction for a center line of length direction are laminated in radial direction to make a cylinder shape, coupled to the first lamination core 600 to be located on inner or outer side of the first lamination core 600 whereby the present invention makes the laminating operation simple and convenient.

Full Text

A STATOR FOR A RECIPROCATING MOTOR
TECHNICAL FIELD
The present invention relates to a stator for a reciprocating motor, and
particularly, to a stator for a reciprocating motor of which components can be
fabricated in simple way.
BACKGROUND ART
Generally, a motor is a device for changing electric energy into kinetic
energy, and can be classified into a rotary motor changing the electric energy
into rotating movements and a reciprocating motor changing the electric
energy into linear reciprocating movements.
The motor can be used in various fields as a power source. Especially,
the above motor is applied to most electric devices such as refrigerator, air
conditioner, etc.
In the refrigerator and the air conditioner, the motor is used to rotate
a blast fan, however, it can be also used as a power source by being mounted
on a compressor of cooling cycle device included in the refrigerator and the
air conditioner.
Figures 1 and 2 are showing an example of a reciprocating motor
under development by the present applicant. As shown therein, the
reciprocating motor comprises: a bobbin 100 of ringular shape having a coil
110 wound therein; a terminal portion formed on one side of the bobbin 100
for electrically connecting the coil 110 wound in the bobbin 100 to outer

electric source; an outer core 200 in which a plurality of lamination sheets 210
which are thin plates of U-shape are laminated in radial direction so as to
make a cylindrical shape centering around the bobbin 100; an inner core 300,
in which a plurality of lamination sheets 310 having predetermined area and
length, and having asymmetric upper and lower parts centering around length
direction are laminated in radial direction so as to make a cylinder shape,
inserted into the outer core 200; and an armature 400 inserted between the
outer core 200 and the inner core 300.
The outer core 200 and the inner core 300 including the bobbin 100
construct a stator (S).
On the other hand, the inner core 200 may be located on outer side
of the outer core 200. That is, the bobbin 100 is located on the inner core 300
side, and the bobbin 100 may not be included in the outer core 200.
The lamination sheets 210 constructing the outer core 200 are
laminated so that the bobbin 100 can be inserted into opening recess (H)
formed inside of the lamination sheet 210. In addition, both ends of the
lamination sheet 210 are pole portion 211 forming the poles, and remained
part is path portion 212 on which flux flows.
The lamination sheet 310 constructing the inner core 300 is formed to
have long portion facing the lamination sheet 210 of the outer core 200, short
opposite portion, and coupling recesses 311 with opened ends formed on
both end portions of the lamination sheet.
The armature 400 comprises a magnet holder 410 of cylindrical shape
and a plurality of permanent magnets 420 fixedly coupled on an outer

circumferential surface of the magnet holder 410.
In addition, as shown in Figure 3, a laminated body (L) which is made
by laminating the plurality of lamination sheets 310 in radial direction to make
a cylinder shape is fixedly coupled by press-fitting a fixing ring 312 of ringular
shape into a ring coupled recess 311 of ringular shape formed by a concave
recess of the lamination sheets.
Unexplained reference numeral 220 represents a fixing ring of the
outer core.
As shown in Figure 4, when electric current is flowed on the winding
coil 110, a flux is formed around the winding coil 110 by the electric current
flowing on the winding coil 110, and the flux flows along with the outer core
200 and the inner core 300 as forming a closed loop.
The armature 400 is moved toward a center axis direction by an
interaction between the flux caused by the current flowing on the winding coil
110 and the permanent magnet 420 constructing the armature 400.
In addition, when the direction of electric current flowing on the winding
coil 110 is changed, the direction of the flux formed on the outer core 200 and
the inner core 300, and the armature 400 moves toward opposite direction.
When the electric current is supplied as changing its direction, the
armature 400 undergoes linear reciprocating movements between the outer
core 200 and the inner core 300. Accordingly, the armature 400 is to have
linear reciprocating power.
On the other hand, since the outer core 200 and the inner core 300
making the stator (S) are constructed by the laminated body of the plurality

of lamination sheets, the loss of flux flowing on the stator can be reduced.
However, according to the above conventional structure, when the
stator (S) is fabricated, the lamination sheet 310 constructing the inner core
300 in the stator (S) is formed as an asymmetric shape for a center line in
length direction, and therefore, the directions of the lamination sheets 310
should be coincided and laminated in laminating the plurality of lamination
sheets 310 as a cylinder shape. Thus, the laminating operation is complex,
and productivity is lowered and it is not suitable for mass production.
TECHNICAL GIST OF THE PRESENT INVENTION
Therefore, an object of the present invention is to provide a stator for
a reciprocating motor of which components can be fabricated in simple way
and assembling property can be improved.
In order to achieve the above objects, there is provided a stator for a
reciprocating motor comprising: a bobbin of insulating material on which a coil
is wound; a terminal portion formed integrally with the bobbin for electrically
connecting the coil to outer electric source; a first lamination core in which a
plurality of lamination sheets formed as thin plates of predetermined shape
are laminated in radial direction along with the bobbin; and a second
lamination core, in which a plurality of lamination sheets formed to have
predetermined area and length and formed to have symmetric upper and
lower sides for a center line of length direction are laminated in radial direction
to make a cyJinder shape, coupled to the first lamination core to be located
on inner or outer side of the first lamination core.
Accordingly, the present invention provides a stator for a reciprocating motor
comprising: a bobbin of insulating material on which a coil is wound; a terminal
portion formed integrally with the bobbin for electrically connecting the coil to an
outer electric source; a first lamination core in which a plurality of lamination sheets
formed as thin plates having predetermined shapes are laminated in radial direction
along with the bobbin; and a second lamination core, in which a plurality of
lamination sheets having predetermined area and length and having symmetric
structure in up-and-down direction for a center line of length direction are laminated
in radial direction to make a cylinder shape, coupled to the first lamination core to be
located on inner or outer side of the first lamination core and formed by forming a
square plate body portion of rectangular shape having a predetermined area and
length, and by forming ring insertion recesses having predetermined width and depth
on both ends of a center in length direction of the square plate body portion.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
Figure 1 is a front cross-sectional view showing a reciprocating motor under
development;
Figure 2 is a side view showing the reciprocating motor under development;
Figure 3 is a perspective view showing an inner core constructing the
reciprocating motor under development;
Figure 4 is a front cross-sectional view showing operational status of the
reciprocating motor under development;
Figure 5 is a front cross-sectional view showing a reciprocating motor
including a stator according to the present invention;
Figure 6 is a perspective view showing the stator of the reciprocating motor
according to the present invention;
Figure 7 is a front view showing another example of a lamination sheet
constructing the stator of the reciprocating motor according to the present invention;
and
Figure 8 is a cross-sectional view showing another embodiment of the
reciprocating motor according to the present invention.
MODE FOR CARRYING OUT THE PREFERRED EMBODIMENTS
Figures 1 and 2 show an example of a reciprocating motor under development
by the present applicant. As shown therein, the reciprocating motor comprises: a
bobbin 100 of ringular shape having a coil 110 wound therein; a terminal portion
formed on one side of the bobbin 100 for electrically connecting the coil 110 wound
in the bobbin 100 to outer electric source; an outer core 200 in which a plurality of
lamination sheets 210 which are thin plates of U-shape are laminated in radial
direction so as to make a cylindrical shape centering around the bobbin 100; an inner
core 300, in which a plurality of lamination sheets 310 having predetermined area
and length, and having asymmetric upper and lower parts centering around length
direction are laminated in radial direction so as to make a cylinder shape, inserted
into the outer core 200; and an armature 400 inserted between the outer core 200
and the inner core 300.
The outer core 200 and the inner core 300 including the bobbin 100 construct
a stator (S).
On the other hand, the inner core 200 may be located on outer side of the
outer core 200. That is, the bobbin 100 is located on the inner core 300 side, and the
bobbin 100 may not be included in the outer core 200.
The lamination sheets 210 constructing the outer core 200 are laminated so
that the bobbin 100 can be inserted into opening recess (H) formed inside of the
lamination sheet 210. In addition, both ends of the lamination sheet 210 are pole
portion 211 forming the poles, and remaining part is path portion 212 on which flux
flows.
The laminated sheet 310 constructing the inner core 300 is formed to have
long portion facing the lamination sheet 210 of the outer core 200, short opposite
portion, and coupling recesses 311 with opened ends formed on both end portions of
the laminated sheet.
The armature 400 comprises a magnet holder 410 of cylindrical shape and a
plurality of permanent magnets 420 fixedly coupled on an outer circumferential
surface of the magnet holder 410.
In addition, as shown in Figure 3, a laminated body (L) which is made by
laminating the plurality of lamination sheets 310 in radial direction to make a
cylindrical shape is fixedly coupled by press-fitting a fixing ring 312 of ringular shape
into a ring coupled recess 311 of ringular shape formed by a concave recess of the
lamination sheets.
Unexplained reference numeral 220 represents a fixing ring of the outer core.
As shown in Figure 4, when electric current flows on the winding coil 110, a
flux is formed around the winding coil 110 by the electric current flowing on the
winding coil 110, and the flux flows along with the outer core 200 and the inner core
300 as forming a closed loop.
The armature 400 is moved toward a center axis direction by an interaction
between the flux caused by the current flowing on the winding coil 110 and the
permanent magnet 420 constructing the armature 400.
In addition, when the direction of electric current flowing on the winding coil
110 is changed, the direction of the flux formed on the outer core 200 and the inner
core 300, and the armature 400 moves towards opposite direction.
When an electric current is supplied as changing its direction, the armature
400 undergoes linear reciprocating movements between the outer core 200 and the
inner core 300. Accordingly, the armature 400 is to have linear reciprocating power.
On the other hand, since the outer core 200 and the inner core 300 making
the stator (S) are constructed by the laminated body of the plurality of lamination
sheets, the loss of flux flowing on the stator can be reduced.
However, according to the above conventional structure, when the stator (S) is
fabricated, the lamination sheet 310 constructing the inner core 300 in the stator (S)
is formed as an asymmetric shape for a center line in length direction, and therefore,
the directions of the lamination sheets 310 should be coincided and laminated in in
laminating the plurality of lamination sheets 310 as a cylinder shape. Thus, the
laminating operation is complex, and productivity is lowered and it is not suitable for
mass production.
The present invention will now be described with reference to the
accompanying drawings.
Figure 5 shows a reciprocating motor including an embodiment of a

stator according to the present invention. As shown therein, in the
reciprocating motor, a terminal portion 520 for electricaiiy connecting a coil
510 to outer electric source is formed integrally on an insulating bobbin 500
on which a coil 510 is wound.
In addition, a first lamination core 600 is coupled to outer side of the
bobbin 500, and the first lamination core 600 is a laminated body in which a
plurality of lamination sheets 610 formed as thin plates of U-shape are
laminated in radial direction along with the bobbin 500.
The plurality of lamination sheets 610 constructing the first lamination
core 600 are laminated from one side surface of the terminal portion 520 to
another side surface of the terminal portion 520 so that the bobbin 500 can
be inserted into an opened recess (H) formed in the lamination sheets 610.
In addition, both ends of the lamination sheets 510 become a pole portion
611, and remained part becomes a path portion 612 on which the flux flows.
In addition, a second lamination core 700 is inserted into the first
lamination core 600 with a predetermined gap therebetween.
As shown in Figure 6, the second lamination core 700 comprises a
laminated body L' which is made by laminating a plurality of lamination sheets
710, of which upper and lower sides are formed to have symmetric structure
for center line in length direction, in radial direction to make a cylinder shape,
and a fixing ring 720 for fixing the laminated body L'.
Also, the lamination sheet 710 constructing the second lamination core
700 is formed to have symmetric structure in left-and-right sides based on a
vertical center line for the length direction.

The lamination sheet 710 constructing the second lamination core 700
is made by forming a square plate body portion 711 of rectangular shape
having a predetermined area and length, and forming ring insertion recesses
712 having predetermined width and depth on both ends of a center line in
length direction of the square plate body portion 711.
The lamination sheets 710 are laminated in radial direction to make a
cylindrical shape, and after that, the fixing ring 720 of ringular shape is press-
fitted into a recess of ringular shape formed by the ring insertion recesses 712
of the plurality of lamination sheets 710.
Also, as another example of the second lamination core 700, the
lamination sheet 730 may be formed by a square plate body portion 731 of
rectangular shape having a predetermined area and length, ring insertion
recesses 732 formed on both ends of a center in length direction of the
square plate body portion 731 to have a predetermined width and depth, and
a cut recesses 733 formed on upper and lower sides of the ring insertion
recesses 732 respectively to make corners of the square plate body portion
731 be acute angles, as shown in Figure 7. It is desirable that the cut
recesses 733 are formed as triangles.
In addition, an armature 800 is inserted between the first lamination
core 600 and the second lamination core 700. The armature 800 comprises
a magnet holder 810 formed as a cylinder and a plurality of permanent
magnets 820 fixedly coupled on an outer circumferential surface of the
magnet holder 810.
Also, as another embodiment of the present invention, the stator for

the reciprocating motor comprises: a bobbin 500 of insulating material on
which a coil 510 is wound; a terminal portion 520 formed integrally with the
bobbin 500 for electrically connecting the coil 510 to outer electric source; a
first lamination core 600 in which a plurality of lamination sheets 510 formed
as thin plates of predetermined shapes are laminated in radial direction along
with the bobbin 500; and a second lamination core 700, in which a plurality
of lamination sheets 710 having predetermined area and length and having
symmetric structure in up-and-down direction for a center line of length
direction are laminated in radial direction to make a cylinder shape, coupled
to the first lamination core 600 to be located on outer side of the first
lamination core 600, as shown in Figure 8.
That is, the first lamination core 600 is inserted into the second
lamination core 700 with a predetermined gap therebetween.
Also, left and right sides of the lamination sheet 710 constructing the
second lamination core 700 is formed to be symmetric based on a vertical
center line for the length direction.
That is, the lamination sheet 710 constructing the second lamination
core 700 is formed by a square plate body portion 711 of rectangular shape
having predetermined area and length, and by ring insertion recesses 712
having a predetermined width and depth formed on both ends of the center
in length direction of the square plate body portion 711.
In addition, the armature 800 is inserted between the first lamination
core 600 and the second lamination core 700.
Hereinafter, operation and effect of the stator for the reciprocating

motor will be described as follows.
When the electric current is flowed on the winding coil 510 located in
the bobbin 500, the flux flows along with the first lamination core 600 and the
second lamination core 700 by the current flowing on the winding coil 510 as
forming a closed loop.
The armature is moved toward the center axis by an interaction
between the flux caused by the electric current flowing on the winding coil 510
and the permanent magnets 820 constructing the armature 800.
In addition, when direction of the electric current flowing on the winding
coil 510 is changed, direction of the flux formed on the first lamination core
600 and the second lamination core 700 is changed, and therefore, the
permanent magnets 820 are moved toward opposite direction.
As described above, when the electric current is supplied as changing
its direction, the armature 800 undergoes linear reciprocating movements
between the first lamination core 600 and the second lamination core 700.
On the other hand, since the plurality of lamination sheets 710
constructing the second lamination core 700 are formed to have symmetric
structure in up-and-down, and left-and-right directions on the basis of the
center line in length direction, the lamination sheets 710 do not have
directional property when the sheets are laminated in radial direction, and
therefore, the lamination sheets 710 can be laminated without arranging them
in a predetermined direction.
In addition, in case of the second lamination core 700 in which a
plurality of lamination sheets 730 having cut recesses 733 are laminated

shown in Figure 7, the flow of flux which is induced through the pole portion
611 of the first lamination core 611 can be smooth due to the form property.
INDUSTRIAL APPLICABILITY
As so far described, according to the stator for reciprocating motor of
the present invention, a plurality of lamination sheets constructing the radial
laminated body are constructed so that the upper and lower sides of the
sheets are symmetric for the center line in length direction, and therefore, the
plurality of lamination sheets can be laminated without arranging them toward
a certain direction. Thus, the laminating operation can be made simply and
conveniently to improve the assembling productivity, and to increase mass
productivity.

WE CLAIM :
1. A stator for a reciprocating motor comprising:
a bobbin 500 of insulating material on which a coil 510 is wound;
a terminal portion formed integrally with the bobbin 510 for electrically
connecting the coil 510 to an outer electric source;
a first lamination core 600 in which a plurality of lamination sheets 610
formed as thin plates having predetermined shapes are laminated in radial direction
along with the bobbin 500; and
a second lamination core 700, in which a plurality of lamination sheets 710
having predetermined area and length and having symmetric structure in up-and-
down direction for a center line of length direction are laminated in radial direction to
make a cylinder shape, coupled to the first lamination core 600 to be located on
inner or outer side of the first lamination core 600 and formed by forming a square
plate body portion of rectangular shape having a predetermined area and length,
and by forming ring insertion recesses 712 having predetermined width and depth
on both ends of a center in length direction of the square plate body 711 portion.
2. The stator as claimed 1, wherein upper and lower sides of the second
lamination sheet 710 constructing the second lamination core 700 are formed to be
symmetric based on a vertical center line for length direction.
3. The stator as claimed 1, wherein the lamination sheet 710 of the second
lamination core 700 comprises a square plate body 711 portion rectangular shape
having a predetermined area and length, ring insertion recesses 712 having
predetermined width and depth formed on body ends of a center in length direction
of square plate body 711 portion, and cut recesses formed on upper and lower
sides of the ring insertion recesses 712 respectively for making corners of the
square plate body 711 portion be acute angles.
A stator of a reciprocal motor comprises a bobbin 500 of insulating material
on which a coil 510 is wound; a terminal portion formed integrally with the bobbin
510 for electrically connecting the coil 510 to an outer electric source; a first
lamination core 600 in which a plurality of lamination sheets 610 formed as thin
plates having predetermined shapes are laminated in radial direction along with the
bobbin 500; and a second lamination core 700, in which a plurality of lamination
sheets 710 having predetermined area and length and having symmetric structure in
up-and-down direction for a center line of length direction are laminated in radial
direction to make a cylinder shape, coupled to the first lamination core 600 to be
located on inner or outer side of the first lamination core 600 whereby the present
invention makes the laminating operation simple and convenient.

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Patent Number

223912

Indian Patent Application Number

IN/PCT/2002/01533/KOL

PG Journal Number

39/2008

Publication Date

26-Sep-2008

Grant Date

23-Sep-2008

Date of Filing

16-Dec-2002

Name of Patentee

LG ELECTRONICS INC.

Applicant Address

20 YOIDO-DONG, YONGDUNGPO-KU, SEOUL

Inventors:

#	Inventor's Name	Inventor's Address
1	JEON SI - HANG	DAEDONG MANSION 2-253, NAMBUMIN 2-DONG, SEO-GU, 602-022 BUSAN
2	YOON HYUNG-PYO	GAENARI APT 403-901, DAEBANG - DONG, 641-756 CHANGWON, GYUNGSANGNAM -DO

PCT International Classification Number

H02K 41/02

PCT International Application Number

PCT/KR01/00866

PCT International Filing date

2001-05-24

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1	PCT/KR01/00866	2001-05-24	U.S.A.