KR101730738B1 - Progressive molding apparatus for manufacturing inner core of linear motor - Google Patents

Progressive molding apparatus for manufacturing inner core of linear motor Download PDF

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Publication number
KR101730738B1
KR101730738B1 KR1020150168215A KR20150168215A KR101730738B1 KR 101730738 B1 KR101730738 B1 KR 101730738B1 KR 1020150168215 A KR1020150168215 A KR 1020150168215A KR 20150168215 A KR20150168215 A KR 20150168215A KR 101730738 B1 KR101730738 B1 KR 101730738B1
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South Korea
Prior art keywords
inner core
core sheet
sheet
support body
shape
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KR1020150168215A
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Korean (ko)
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이선규
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나라엠앤디(주)
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Power Engineering (AREA)
  • Manufacture Of Motors, Generators (AREA)

Abstract

The present invention relates to a progressive mold apparatus for manufacturing an inner core of a linear motor which can control an occupying ratio between inner core sheets while stacking a plurality of inner core sheets to be interconnected in a blanking step to enable each of the plurality of inner core sheets forming an inner core to easily form a cylindrical shape, and automatically counting the inner core sheets when the plurality of inner core sheets are stacked by being interconnected.

Description

TECHNICAL FIELD [0001] The present invention relates to a progressive mold apparatus for manufacturing an inner core of a linear motor,

The present invention relates to a progressive mold apparatus for manufacturing an inner core of a linear motor.

The linear motor was invented in the middle of the 18th century and was originally developed and used as a spinning machine in the textile industry. In 1946, Westminster, USA, developed an electric catapult using a linear motor as an aircraft takeoff and landing aid The application to various fields has begun to spread.

However, systematic and rational research through theory has been initiated by the professor Laithwaite in the UK since the 1950s and has evolved into a remarkable achievement to date. Now, based on many research results, application development has been spreading as a core drive device of various automation systems such as a magnetic levitation train, a linear motor car, and an OA, HA, and FA machine.

The basic principle of such a linear motor is that the stator of the general rotation type motor is cut off in the axial direction and the existing general motor generates the thrust which is the pushing force in the linear direction as compared with the generation of the rotational type motive force, The principle is basically the same.

Particularly, in a linear drive system, in the case of a rotary motor, a power transmission means such as a screw, a chain, or a gear is required to generate a linear drive force, whereas a linear motor generates a linear drive force directly, There is an advantage that it is possible to operate efficiently while minimizing energy loss and noise with simple structure.

The linear motor described above can be divided into two types, that is, a flat type and a cylindrical type. The cylindrical type is cylindrical in shape in a transverse direction about the longitudinal direction with respect to the flat type.

A typical cylindrical linear motor includes a stator 10 including an outer core 11 formed in a cylindrical shape and an inner core 12 formed in a cylindrical shape to be inserted into the outer core 11 at a predetermined interval, A winding coil 20 coupled to the inside of the outer core 11 and a movable member 30 having a permanent magnet 31 and inserted and moving between the outer core 11 and the inner core 12, ).

A magnetic field is formed around the winding coil 20 by a current flowing in the winding coil 20 when a current flows through the winding coil 20 and a magnetic field is generated in the outer core 11 and the inner core 12 to form a closed loop. The permanent magnet 31 is axially urged by the interaction between the magnetic field formed by the outer core 11 and the inner core 12 and the magnetic field formed by the permanent magnet 31, Is linearly moved in the axial direction between the outer core 11 and the inner core 12. When the direction of the current applied to the winding coil 20 is changed, the mover 30 linearly reciprocates .

As shown in FIG. 2, the inner core 12 is formed of a laminate in which a plurality of inner core sheets 12a are laminated in a radial manner so as to have a cylindrical shape, and each of the inner core sheets 12a has a cylindrical shape So that they can be fixed to each other in order to form the inner core 12. For fixing between the inner core sheets 12a, they may be welded to each other or bonded with an adhesive. However, when the inner core 12 is manufactured by welding or bonding each of the inner core sheets 12a, the process itself becomes very long, and when the welding or bonding is performed, the inner core 12 is twisted with each other or the shape of the cylindrical inner core 12 Can not be formed accurately and the defect occurrence rate is increased.

In order to solve such a problem, in the 'laminated core fixing structure of a linear motor' of Patent No. 10-0360264, as shown in Fig. 3, each of the inner core sheets 12a is cylindrically laminated, And a press-fit fixing structure is proposed. In addition, in order to laminate each inner core sheet 12a in a cylindrical shape, in the 'method for manufacturing a core for a linear motor' of Patent Publication No. 10-0519114, as shown in FIG. 4, A method of inserting and aligning the inner core sheet 12a and attaching an adhesive tape to one side so that each of the aligned inner core sheets 12a are connected to each other, .

However, in the case of the inner core manufacturing method of the linear motor according to the above-mentioned prior art, each of the inner core sheets 12a constituting the inner core 12 is blanked from the press forging die, The inner core sheets 12a need to be stacked in a cylindrical shape or the adhesive tape must be attached after being inserted and aligned in a separate horizontal alignment jig.

Second, in order to form the cylindrical inner core 12, the number of the inner core sheets 12a required depends on the diameter of the inner core 12, and the number of the inner core sheets 12a varies depending on the diameter of the inner core sheet 12, There is a problem in that, in the case of the prior art, in the case of the conventional technique, a worker manually recovers the number of the inner core sheets 12a and the inner core sheet 12a, .

SUMMARY OF THE INVENTION It is an object of the present invention, which is devised to solve the problems as described above, to provide a method of manufacturing an inner core sheet, in which a plurality of inner core sheets constituting a first inner core are easily formed into a cylindrical shape, And the second core sheet is laminated in a state where the inner core sheets are laminated to each other, the dot ratio between the inner core sheets can be adjusted while automatically repairing the inner core sheet, and a progressive mold apparatus for manufacturing inner core of a linear motor is provided .

Other objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments with reference to the accompanying drawings.

According to an aspect of the present invention, there is provided a progressive die for manufacturing an inner core of a linear motor, comprising: a progressive die for manufacturing a plurality of inner core sheets constituting an inner core of a linear motor by processing strips continuously and stepwise supplied, The apparatus is characterized in that it is located at a side where the strip is fed and passes through an alignment hole on the strip so as not to interfere with the shape of the inner core sheet to be processed for alignment in each processing step at the time of transferring the strip A plurality of protrusion insertion holes are formed on the strip along the longitudinal direction of the first inner core sheet, which is provided at a next stage of the aligning piercing mold and constitutes the inner core, Counter mold counting to the shape of the last inner core sheet A pair of retaining rings inserted from the first inner core sheet shape to the shape of the last inner core sheet so as to correspond to the retaining ring inserting grooves into which the retaining ring is press-fitted and fixed to the cylindrical inner core, A ring insertion hole piercing mold for forming a hole on the strip; and a ring insertion hole piercing mold provided in the next step of the ring insertion hole piercing mold and adapted to correspond to the projection insertion hole formed in the shape of the first inner core sheet, Wherein a plurality of half-cut projections are formed on the strip to form a predetermined inner core sheet shape; and a sheath drawing die provided at a next stage of the shearing drawing die, the shape of the first inner core sheet to the shape of a final inner core sheet The first inner core sheet blanked from the first inner core sheet to the second inner core sheet, It characterized in that it comprises a laminated portion having a blanking die to laminate to the air sheet.

The laminate of the blanking die has a half-cut projection of the second inner core sheet inserted into the projection insertion hole of the first inner core sheet, and a third inner core sheet is formed on the opposite surface of the half- And the half-cut projections of the core sheet are inserted and joined to each other to continuously join the last inner core sheet to each other.

The lamination portion of the blanking die may include a holder fixed to the lower portion of the blank where the strip is blanked and having a lamination hole formed vertically through the lamination hole and spaced apart from each other so as to face each other in the lamination hole of the holder, And a pair of pressing supports for pressing and supporting both longitudinal side surfaces of the inner core sheet to be blanked.

The pressing support body of the lamination portion may include a fixed support fixed to the inside of the holder and a movable support provided movably so as to be close to or spaced from the fixed support, And a pusher coupled to the movable support body and moving the movable support body in proximity to or spaced from the fixed support body.

The pressing support body of the lamination portion is characterized in that a plurality of escape grooves recessed upward and downward are formed on the surfaces facing each other.

The progressive mold apparatus for manufacturing an inner core of a linear motor according to the present invention is characterized in that a plurality of inner core sheets constituting the first inner core are laminated so as to be coupled to each other in a blanking step so that each of the inner core sheets can easily form a cylindrical shape And when the inner core sheets of the second plurality are stacked in a state of being coupled to each other, the inner core sheet can be automatically repaired and the drop rate between the inner core sheets can be adjusted.

1 is a side sectional view showing a general linear motor,
Fig. 2 is a perspective view showing an inner core of the embodiment of Fig. 1,
3 is a side sectional view and a plan sectional view showing an upper mold of an embodiment of a progressive mold apparatus for manufacturing an inner core of a linear motor according to the present invention,
FIG. 4 is a side cross-sectional view and a top cross-sectional view showing a lower mold according to the embodiment of FIG. 3,
Fig. 5 is a plan view of a strip illustrating the inner core sheet formed along four lines in the width direction in the embodiment of Fig. 4,
FIG. 6 is a plan sectional view showing a laminated portion in the embodiment of FIG. 4,
Fig. 7 is a horizontal sectional view showing the holder of the lamination part and the pressing support body in the embodiment of Fig. 6,
8 is a cross-sectional view taken along the line A-A 'in the embodiment of FIG. 6,
FIG. 9 is a perspective view showing only a laminated portion of the embodiment of FIG. 4,
10 is a flowchart showing an embodiment of a method of manufacturing an inner core of a linear motor using a progressive metal according to the present invention,
11 is a side cross-sectional view of a progressive mold made up of the upper and lower molds of FIGS. 3 and 4 for the embodiment of FIG. 10,
12 is a plan view of a strip showing a process of forming an inner core sheet according to the embodiment of FIG. 11,
13 is a plan view showing first to last inner core sheets blanked by blanking dies in the embodiment of Fig. 11 and stacked on the lamination portion,
14 is a perspective view showing a process of stacking the first to last inner core sheets in the stacking direction of the embodiment of FIG.
FIG. 15 is a perspective view showing a state in which first to last inner core sheets are laminated on the basis of the embodiment of FIG. 13,
FIG. 16 is a perspective view of the embodiment of FIG. 15,
17 is a flowchart showing another embodiment of a method of manufacturing an inner core of a linear motor using the progressive metal according to the present invention,
Figs. 18 and 19 are perspective views actually taken by performing the inner core winding step and the fixed ring press-in step in the embodiment of Fig. 17, respectively, from the embodiment of Fig.

Hereinafter, a preferred embodiment of a progressive mold apparatus for manufacturing inner core of a linear motor according to the present invention will be described in detail with reference to the accompanying drawings.

3 and 4, the progressive mold apparatus for manufacturing an inner core of a linear motor according to the present invention includes a plurality of innersoles 200 constituting an inner core 200 of a linear motor by processing a strip 100 supplied continuously and stepwise, 11, the progressive mold apparatus 300 for manufacturing the core sheet 210 includes an aligning piercing mold 310, a counter mold 320, a ring insertion hole piercing mold 330, a shearing drawing die 340 and a blanking mold 350, and the blanking mold 350 is provided with a lamination portion 360. As shown in FIG. The lamination portion 360 includes a holder 361, a pushing support body 362, and a pusher 363 as shown in Figs.

Since the inner core 200 of the linear motor is formed by radially coupling a plurality of inner core sheets 210 in a cylindrical shape, each inner core sheet 210 must be manufactured for manufacturing the inner core 200, The strip 100 is continuously and stepwise processed by using the progressive mold 300 as shown in FIGS. 3 and 4 to form the first to the last inner core sheets 211 to 212 Blanking is laminated. The progressive mold 300 shown in FIGS. 3 and 4 is designed to process four rows of inner core sheets 210 in the width direction on one strip 100 as shown in FIG. 5 for mass production. In the case of the progressive mold 300 designed in this way, since the drawings and the description are complex, only the processing of the inner core sheet 210 in one row is separately shown and the progressive mold 300 having a simple structure is shown in FIG.

11 and 12, the aligning piercing mold 310 of the progressive mold 300 is located on the side where the strip 100 is fed, and when the strip 100 is fed, Hole 110 is formed on the strip 100 so as not to interfere with the shape of the inner core sheet 210 to be processed. The inner core sheet 210 is formed such that the inner core sheet 210 is blanked by a blanking mold 350 to be described later on the strip 100. In an actual step of performing the aligning piercing die 310, 100).

11 and 12, the counter mold 320 is installed in the next step of the aligning piercing mold 310 to form a first inner core sheet 211 in the longitudinal direction of the inner core 200 A plurality of protrusion insertion holes 211a are formed on the strip 100 and counted from the second to the predetermined inner core sheet 212. That is, when the total amount of the inner core sheet 210 constituting the inner core 200 to be manufactured is set in advance, the counter mold 320 is formed so as to penetrate the protrusion insertion hole 211a only in the first inner core sheet 211 The remaining inner core sheet 212 is simply counted. For example, if the total number of inner core sheets 210 constituting the inner core 200 to be manufactured is 200, the protrusion insertion holes 211a are formed only through the first inner core sheet 211, The 200 inner core sheet 212 is only counted and the protrusion insertion hole 211a is formed through the 201th inner core sheet 210 constituting the next inner core 200. [

11 and 12, the ring insertion hole piercing mold 330 is installed at the next stage of the counter metal mold 320 and is fixed to the cylindrical inner core 200 by press fitting the fixing ring 230 A pair of fixing ring insertion holes 120 from the shape of the first inner core sheet 211 to the shape of the last inner core sheet 212 are formed on the strip 100 so as to correspond to the ring insertion groove 220 . After the fixing ring insertion hole 120 is formed in advance on the strip 100 and the inner core sheet 210 is blanked by the blanking mold 350 to be described later, the fixing ring insertion groove 220 is formed in the inner core sheet 210 As shown in Fig.

11 and 12, the shearing drawing die 340 is installed at the next stage of the ring insertion hole piercing mold 330, and the protrusion insertion hole (not shown) formed through the shape of the first inner core sheet 211 A plurality of half cut protrusions 212a are formed on the strips 100 so as to correspond to the first inner core sheet 212 and the second inner core sheet 212, respectively. As shown in FIGS. 13 to 15, the half cut protrusion 212a is a protrusion which is connected to two of four sides and is cut so that the other two sides are cut out and protruded, And is formed so as to correspond to the recess 211a.

11 and 12, the blanking mold 350 is installed at the next stage of the shearing drawing die 340, and the blanking mold 350 is moved from the first inner core sheet 211 to the last inner core sheet 212 And a lamination portion 360 for laminating the first inner core sheet 211 to the last inner core sheet 212 which are blanked and sequentially bored downward in the strip 100.

8, 13 to 16, the laminated portion 360 of the blanking mold 350 is inserted into the protrusion insertion hole 211a of the first inner core sheet 211 through the second inner core sheet 212 And the half cut protrusion 212a of the third inner core sheet 212 is inserted into the opposite surface of the half cut protrusion 212a of the reusers core sheet 212 twice To the last inner core sheet 212 in a continuous manner.

On the other hand, when the first inner core sheet 211 and the last inner core sheet 212 are successively inserted and joined together, the gap between the respective inner core sheets 210 can be adjusted to set the drop rate, Thus, the total amount and radius of the inner core sheet 210 of the inner core 200 to be manufactured can be determined. To this end, it is necessary to have a structure and an adjusting means capable of adjusting the gap between the inner core sheets 210 in the lamination portion 360 and stacking them.

6 to 9, the stacking unit 360 of the blanking mold 350 includes a holder 361 fixed to the lower portion of the blank 100 where the strip 100 is blanked, A pair of pushing support members (361, 362) spaced apart from each other in the laminated hole of the holder (361) so as to face each other in the longitudinal direction of the inner core sheet (210) 362). Therefore, the interval between the inner core sheets 210 laminated in accordance with the pressing degree of the pushing support body 362 is set to be smaller than the interval between the inner core sheets 210 stacked in the downward direction while the inner core sheet 210 is blanked and inserted between the pushing supports 362 Will be adjusted.

6 to 9, the pressing support body 362 of the lamination unit 360 includes a fixed support body 362a fixed to the inside of the holder 361 and a pressing support body 362b fixed to the fixed support body 362a And a moving support body 362b provided so as to be movable toward or away from the moving support body 362b such that the stacking unit 360 passes through one side of the holder 361 and is coupled to the moving support body 362b, (363a) to move the holding member (362a) close to or away from the fixed support (362a).

In addition, if both side surfaces of the inner core sheet 210 are in contact with each other between the pushing supporting bodies 362, a very large frictional force is generated even by a slight pressing, thereby finely adjusting the gap between the inner core sheets 210 It is difficult to do. Therefore, it is necessary to make it easy to finely adjust the interval while reducing the frictional force according to the degree of pressing. 6 and 7, the pushing support body 362 of the lamination part 360 is formed with a plurality of escape grooves 362c recessed upward and downward on the surfaces thereof facing each other. Both sides of the inner core sheet 210 in contact with the pushing support body 362 are in contact with each other as much as the escape grooves 352c to reduce the frictional force and the gap between the inner core sheets 210, .

As shown in FIG. 16, the inner core 200 is manufactured by continuously stacking the laminated portion 360 through the progressive mold apparatus for manufacturing inner core of a linear motor according to the present invention. The manufactured inner core 200 is finally finished through the inner core winding step S700 and the fixed ring press-fitting step S800 as shown in Figs. 18 and 19.

Hereinafter, a method for manufacturing an inner core of a linear motor using the progressive mold 300 according to the present invention will be described with reference to the drawings, and a duplicate description will be omitted.

As shown in FIGS. 10 to 12, the aligning piercing step S100 may be performed by using an aligning piercing die 310 located on the side where the strip 100 is fed, The alignment hole 110 is formed on the strip 100 so as not to interfere with the shape of the inner core sheet 210 to be processed for alignment in the processing step.

10 to 12, the counting step S200 may be performed by using the counter metal mold 320 positioned at the next stage of the aligning piercing mold 310 to form the first inner core 200 forming the inner core 200, A plurality of protrusion insertion holes 211a are formed on the strip 100 along the longitudinal direction of the sheet 211 and counted from the second to the final inner core sheet 212 predetermined.

As shown in FIGS. 10 to 12, the ring insertion hole piercing step S300 is performed by using a ring insertion hole piercing mold 330 located at the next stage of the counter metal mold 320, A pair of fixing ring insertion holes 120 from the shape of the first inner core sheet 211 to the shape of the last inner core sheet 212 corresponding to the fixing ring insertion groove 220 into which the fixing ring 230 is press- Is formed on the strip (100).

10 to 12, the half cut protrusion forming step S400 is performed by using the shearing drawing die 340 located at the next stage of the ring insertion hole piercing mold 330, A plurality of half cut protrusions 212a are formed on the strip 100 so as to correspond to the protrusion insertion holes 211a formed in the shape of the second inner core sheet 212. As shown in FIG.

10 to 12, the blanking step S500 is performed by using the blanking mold 350 positioned at the next stage of the shearing drawing die 340 to form the first inner core sheet 211, The strips 100 are blanked up to the shape of the sheet 212.

The inner core sheet stacking step S600 may be performed by using the lamination unit 360 located below the inner core sheet 210 blanked from the blanking mold 350 as shown in FIGS. From the inner core sheet 211 to the last inner core sheet 212 in this order. At this time, the laminated portion 360 is engaged with the half-cut protrusion 212a of the second inner core sheet 212 inserted into the protrusion insertion hole 211a of the first inner core sheet 211, The second inner core sheet 212 is inserted and joined to the last inner core sheet 212 in such a manner that the half cut protrusion 212a of the third inner core sheet 212 is inserted and joined to the opposite surface of the half sheet protrusion 212a of the core sheet 212, . As shown in FIG. 16, the inner core 200, which is continuously stacked on the stacking portion 360 and connected in the longitudinal direction, is formed.

The inner core winding step S700 may include winding the inner core 200 connected from the first inner core sheet 211 stacked on the stacking unit 360 to the last inner core sheet 212 as shown in FIGS. The first inner core sheet 211 and the last inner core sheet 212 come into contact with each other and are rounded so as to have a cylindrical shape.

The fixed ring press-fitting step S800 presses and fixes the fixing ring 230 into the fixing ring insertion groove 220 of the cylindrical inner core 200, which is cylindrically dried, as shown in FIGS. Accordingly, as shown in Fig. 1, the inner coil 200 of the stator of the linear motor is completed.

As described above, in the progressive mold apparatus for manufacturing an inner core of a linear motor according to the present invention, in the blanking step S500 so that each of the plurality of inner core sheets 210 constituting the inner core 200 can easily form a cylindrical shape A plurality of inner core sheets 210 are stacked in a state of being coupled to each other and a second plurality of inner core sheets 210 are stacked in a state of being coupled with each other, (210) can be adjusted.

The embodiments of the present invention described above and shown in the drawings should not be construed as limiting the technical idea of the present invention. The scope of protection of the present invention is limited only by the matters described in the claims, and those skilled in the art will be able to modify the technical idea of the present invention in various forms. Accordingly, such improvements and modifications will fall within the scope of the present invention as long as they are obvious to those skilled in the art.

100: strip
110: Align hole 120: Fixing ring insertion hole
200: inner core 210: inner core sheet
211: first inner core sheet 211a: projection insertion hole
212: second to last inner core sheet 212a: half cut projection
220: Fixing ring insertion groove 230: Fixing ring
300: Progressive mold 310: Aligned piercing mold
320: Counter mold 330: Ring insert hole piercing mold
340: shearing drawing mold 350: blanking mold
360: laminated portion 361: holder
362: a pressing support body 362a:
362b: Moving support body 362c: Escape groove
363: pusher
S100: Aligned piercing step
S200: Counting step
S300: Ring insertion hole piercing step
S400: half-cut projection formation step
S500: Blanking step
S600: inner core sheet lamination step
S700: Inner core winding stage
S800: Fixing ring press-in step

Claims (5)

There is provided a progressive mold apparatus for manufacturing a plurality of inner core sheets constituting inner cores of a linear motor by processing continuous and stepwise supplied strips,
And an aligning piercing die located on a side where the strip is fed and forming an alignment hole on the strip so as not to interfere with the shape of the inner core sheet to be processed in order to align in each processing step, And a plurality of protrusion insertion holes formed along the longitudinal direction of the first inner core sheet to form the inner core at the next stage of the aligning piercing die, A counter-metal mold for counting up to the shape of the core sheet; and a counter-metal mold provided in the next stage of the counter mold, And a ring insertion hole piercing through which a pair of fixing ring insertion holes are formed on the strip up to the sheet shape And a plurality of half cut protrusions provided in a next stage of the ring insertion hole piercing die and having a shape corresponding to the protrusion insertion holes formed in the shape of the first inner core sheet, And a second inner core sheet having a first inner core sheet shape and a second inner core sheet shape, wherein the first and second inner core sheet sheets form a first inner core sheet and a second inner core sheet, And a blanking die having a lamination part for laminating the first inner core sheet to the last inner core sheet,
Wherein the stacking portion of the blanking die comprises:
A half cut protrusion of the second inner core sheet is inserted and engaged with the protrusion insertion hole of the first inner core sheet and a half cut protrusion of the third inner core sheet is inserted into the opposite surface of the half core protrusion of the second inner core sheet Joined in a continuous manner to the last inner core sheet in a joined manner,
A holder fixed to the lower portion of the blank where the strip is blanked,
And a pair of pushing supporting bodies spaced apart from each other so as to face each other in the laminated hole of the holder and pressing and supporting both longitudinal side surfaces of the inner core sheet which are sequentially blanked downward,
Wherein the pressing support body of the lamination portion comprises:
And a plurality of recessed recesses vertically recessed are formed on the surfaces facing each other.
The method according to claim 1,
Wherein the pressing support body of the lamination portion comprises:
A fixed support fixed to the inside of the holder,
And a movable support body movably installed adjacent to or spaced from the fixed support body,
The lamination portion
Further comprising a pusher which penetrates through one side of the holder and is coupled to the movable support body and moves the movable support body in proximity to or spaced from the fixed support body. delete delete delete
KR1020150168215A 2015-11-30 2015-11-30 Progressive molding apparatus for manufacturing inner core of linear motor KR101730738B1 (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002247809A (en) 2001-02-02 2002-08-30 Lg Electronics Inc Method and structure for laminating core of motor
JP2004007936A (en) 2002-04-08 2004-01-08 Ichinomiya Denki:Kk Method of producing motor core and motor core

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002247809A (en) 2001-02-02 2002-08-30 Lg Electronics Inc Method and structure for laminating core of motor
JP2004007936A (en) 2002-04-08 2004-01-08 Ichinomiya Denki:Kk Method of producing motor core and motor core

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