WO2024035031A1 - Jig for manufacturing rotor core of motor by induction and conduction heating - Google Patents

Jig for manufacturing rotor core of motor by induction and conduction heating Download PDF

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Publication number
WO2024035031A1
WO2024035031A1 PCT/KR2023/011571 KR2023011571W WO2024035031A1 WO 2024035031 A1 WO2024035031 A1 WO 2024035031A1 KR 2023011571 W KR2023011571 W KR 2023011571W WO 2024035031 A1 WO2024035031 A1 WO 2024035031A1
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WO
WIPO (PCT)
Prior art keywords
jig
rotor core
heating jig
lower heating
holes
Prior art date
Application number
PCT/KR2023/011571
Other languages
French (fr)
Inventor
In Gyu Jung
Original Assignee
Daeyoung Electronics Co., Ltd.
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Filing date
Publication date
Application filed by Daeyoung Electronics Co., Ltd. filed Critical Daeyoung Electronics Co., Ltd.
Publication of WO2024035031A1 publication Critical patent/WO2024035031A1/en

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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
    • H02K15/12—Impregnating, heating or drying of windings, stators, rotors or machines
    • 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
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/101—Induction heating apparatus, other than furnaces, for specific applications for local heating of metal pieces
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/14—Tools, e.g. nozzles, rollers, calenders
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/36—Coil arrangements
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2206/00—Aspects relating to heating by electric, magnetic, or electromagnetic fields covered by group H05B6/00
    • H05B2206/02—Induction heating
    • H05B2206/022—Special supports for the induction coils

Definitions

  • the present invention relates to a jig for heating used in a process for manufacturing a laminated core of a motor. More specifically, the present invention relates to a jig for manufacturing a rotor core capable of applying a high-frequency heating method and a conduction heating method in a process for manufacturing a rotor core, thereby improving the quality and productivity of products without damaging the rotor core.
  • a stator or rotor of a motor is manufactured in the form of a laminated core.
  • a laminated core is manufactured by laminating a plurality of laminar member made by forming an electrical steel strip continuously in a press device.
  • a laminated laminar member needs to be bonded to a laminar member therebelow and a laminar member thereabove.
  • a method of bonding laminar members is disclosed in Korean Patent No. 10-1811266.
  • the above prior art discloses a method of bonding core sheets to each other by forming and laminating a single sheet of laminar member in a press mold using a so-called self-bonding electrical steel strip coated with an adhesive layer on the electrical steel strip, and at the same time, heating the laminated core.
  • a laminated core having core sheets bonded to each other is obtained by thermally curing the adhesive layer between each core sheet by the heating in the press mold, and the manufactured laminated core is cooled through a cooling process to supply products.
  • Korean Patent Laid-Open No. 10-2021-0154779 discloses a technology of laminating a laminated core in a press mold, bonding an upper jig to a lower jig while positioning the laminated core on the lower jig, transferring the jigs through a conveyor, and performing high-frequency induction heating thereon.
  • the induction heating method on a laminated core is heating a rotor core by performing induction heating on heating plates installed in the upper and lower sides of the rotor core using an induction coil.
  • a laminated core particularly a rotor core, has a thin side wall structure in a portion into which a magnet is inserted, and thus rapid heating may damage the thin side wall portion by high-frequency heating.
  • the outside of the laminated core and jigs is cooled to some degree by a blowing method or cool air supplying method, albeit cooled through several steps.
  • considerable time is required to completely cool the laminated core to the inside.
  • the above prior art requires a prolonged cooling process even through it performs rapid heating in a high-frequency heating step, which results in a decrease in productivity.
  • the present inventor suggests a jig for manufacturing a rotor core with improved quality and productivity, capable of performing rapid heating by induction and conduction heating even though a laminated core, particularly a rotor core, has a thin side wall with a complicate structure, and performing rapid cooling to the inside of an upper jig and a lower jig and the rotor core seated therebetween using cool air with a low temperature, thereby preventing thermal deformation of the rotor core and jigs.
  • a jig for manufacturing a rotor core according to the present invention includes a lower heating jig 314 in which a rotor core 200 is seated; a lower heating jig side wall 314-1 which extends upwardly around the lower heating jig 314 to cover a part of the outer circumferential surface of the rotor core 200; an upper heating jig 321 which covers the upper part of the rotor core 200; and an upper heating jig side wall 321-1 which extends upwardly around the upper heating jig 321 to cover the remaining part of the outer circumferential surface of the rotor core 200, wherein the outer circumferential surface of the rotor core 200 forms an interval with the inner circumferential surface of the lower heating jig side wall 314-1 and the upper heating jig side wall 321-1.
  • a lower heat conductive plate 310 which is installed in the upper surface of the lower heating jig 314 and contacts the lower surface of the rotor core 200 may be further included.
  • an upper heat conductive plate 320 which is installed in the lower surface of the upper heating jig 321 and contacts the upper surface of the rotor core 200 may be further included.
  • the lower heat conductive plate 310 and upper heat conductive plate 320 are made of aluminum.
  • a pressure plate 321C which is installed in the lower surface of the upper heating jig 321 and is elastically supported by a buffering member 321D to press the upper surface of the rotor core 200 may be further included.
  • a plurality of ejector pins 314C which are installed in the upper surface of the lower heating jig 314 may be further included.
  • a plurality of first lower heating jig holes 314A are formed in the lower heating jig 314, a plurality of first upper heating jig holes 321A are formed in the upper heating jig 321, and the first lower heating jig hole 314A and the first upper heating jig hole 321A may be in vertical communication with a plurality of first holes 220 formed in the rotor core 200 at regular intervals.
  • a plurality of second lower heating jig holes 314B are formed in the lower heating jig 314, a plurality of second upper heating jig holes 321B are formed in the upper heating jig 321, and the second lower heating jig hole 314B and the second upper heating jig hole 321B may be in vertical communication with a plurality of second holes 230 formed in the rotor core 200 at regular intervals.
  • a jig for manufacturing a rotor core according to the present invention includes a base plate 311; a lower plate 312 which is installed in the upper part of the base plate 311; a fixing block 313 which is installed in the upper part of the lower plate 312; a lower heating jig 314 which is installed in the upper part of the fixing block 313; and a rotor core 200 which is seated in the upper part of the lower heating jig 314, wherein the upper surface of a lower heat conductive plate 310 installed in the upper part of the lower heating jig 314 contacts the bottom surface of the rotor core 200.
  • an upper heating jig 321 may be coupled to the upper part of the lower heating jig 314.
  • a lower heating jig side wall 314-1 extending upwardly is formed around the lower heating jig 314, an upper heating jig side wall 321-1 extending downwardly is formed around the upper heating jig 321, and the outer circumferential surface of the rotor core 200 may form a certain interval with the inner circumferential surface of the lower heating jig side wall 314-1 and the upper heating jig side wall 321-1.
  • the present invention provides a jig for manufacturing a rotor core with a novel structure capable of rapidly heating the rotor core without damaging the rotor core by applying induction heating and conduction heating methods, thereby improving productivity.
  • the present invention allows a cool air supply hole formed in the upper jig and lower jig to be in vertical communication with a hole capable of passing the cool air of the rotor core so that the cool air with low temperature can be supplied and discharged, and accordingly the heated rotor core and jig are rapidly cooled, thereby preventing thermal deformation, improving the quality of the rotor core, and greatly improving productivity thereof.
  • Fig. 1 is a plan view illustrating the entire layout of an apparatus for manufacturing a laminated core of a motor for explaining a jig for manufacturing a rotor core according to the present invention
  • Fig. 2 is a perspective view illustrating a jig for manufacturing a rotor core according to the present invention
  • Fig. 3 is an exploded conceptual diagram illustrating a lower jig of a jig for manufacturing a rotor core according to the present invention
  • Fig. 4 is an exploded conceptual diagram illustrating an upper jig of a jig for manufacturing a rotor core according to the present invention.
  • Fig. 5 is a cross-sectional view of a jig for manufacturing a rotor core according to the present invention.
  • Fig. 1 is a plan view illustrating the entire layout of an apparatus for manufacturing a laminated core of a motor for explaining a jig for manufacturing a rotor core according to the present invention.
  • a base material 100 of the rotor core used in the present invention, in which an adhesive coating layer 102 is formed on the front surface and back surface of an electrical steel strip 101, is a so-called self-bonding steel strip.
  • the base material 100 of the present invention is continuously supplied to an apparatus for manufacturing a laminated core, and is sequentially formed in a laminating unit 1, which is a progressive press machine, to be formed into a laminar member 201 in the form of a sheet.
  • a plurality of formed laminar members 201 are laminated to be a rotor core 200.
  • a rotational shaft insertion hole 210 may be formed in the central part of the rotor core 200, and a first hole 220 and a second hole 230 may be formed around the rotational shaft insertion hole 210 in the outward direction. It is of course that these various shapes of holes may vary depending on the type of the rotor core.
  • the apparatus for manufacturing a laminated core of a motor to which the present invention is applied comprises a laminating unit 1 for forming the base material 100 into laminar members 201 to manufacture a laminated core, a pre-treatment unit 2 for coating an activator, etc. on the base material 100, a welding unit 3 for continuously connecting the base material supplied, an uncoil unit 4 for supplying the base material from a reel around which the base material is would, a post-treatment unit 5 for performing a process after the lamination, and a detection unit 6 for the final detection of a product.
  • the rotor core 200 manufactured by laminating the laminar members 201 manufactured by forming the base material 100 in the laminating unit 1 is placed on a discharge conveyor 10 installed at one side of the laminating unit 1.
  • the rotor core 200 is transferred through the discharge conveyor 10 to one side of the post-processing unit 5 installed at one side of the discharge conveyor 10.
  • the discharge conveyor 10 may be provided as a roller-type conveyor or a belt-type conveyor.
  • the rotor core 200 transferred is transferred and seated above a lower jig 31 of a jig 30 in the post-treatment unit 5, and an upper jig 32 is coupled to the upper part of the lower jig 31.
  • the post-treatment unit 5 is a device for performing the collateral processing on the rotor core 200 in order to increase the product reliability of the rotor core 200 manufactured in the laminating unit 1, and comprises a process line 51, a return line 52, an induction heating unit 53, and a cooling unit 54.
  • the jig 30 in which the rotor core 200 is seated moves along the process line 51 to go through heating and cooling processes.
  • the empty jig 30 returns to its original place along the return line 52.
  • the roller or belt type conveyor, etc. is installed in the process line 51 and the return line 52 so that the jig 30 can be transferred along the processing line.
  • the cooling unit 54 is a cooling device which is installed at one side of the induction heating unit 53 to cool the heated rotor core 200.
  • a loading part 61 is a device for transferring the rotor core 200 which has finished the post-treatment in the process line 51 to the detection unit 6.
  • the detection unit 6 detects the rotor core 200, and a shipping part 62 distinguishes good products from defective products for shipment.
  • Fig. 2 is a perspective view illustrating a jig 30 for manufacturing a rotor core according to the present invention.
  • the jig 30 according to the present invention includes a lower jig 31 and an upper jig 32.
  • the upper jig 32 may be coupled to the upper part of the lower jig 31 while the rotor core 200 is seated in the lower jig 31.
  • the rotor core 200 may be stably transferred without the shaking while the jig 30 is transferred.
  • the upper jig 32 is coupled to the upper part of the lower jig 31 in which the rotor core 200 is seated so as to maintain the state that the rotor core 200 is seated between the lower jig 31 and the upper jig 32.
  • the jig 30 according to the present invention is transferred along the process line 51, heated while passing the heating unit 53, and cooled in the cooling unit 54.
  • the cooling process is performed in the state that the jig 30 enters a cooling room (not shown) of the cooling unit 54.
  • Fig. 3 is an exploded conceptual diagram illustrating a lower jig 31 of a jig 30 for manufacturing a rotor core according to the present invention
  • Fig. 4 is an exploded conceptual diagram illustrating an upper jig 32
  • Fig. 5 is a cross-sectional view illustrating the state that the rotor core 200 is seated in the jig 30 according to the present invention.
  • the lower jig 32 of the jig 30 moves along the processing lines such as the process line 51 and return line 52 in which the conveyor is installed.
  • a base plate 311, a lower plate 312, a fixing block 313, and a lower heating jig 314 are sequentially coupled from the bottom.
  • the base plate 311 has a square planar shape
  • the lower surface of the base plate 311 is placed on the conveyor, and the lower plate 312 is installed in the upper surface of the base plate 311.
  • a base plate central hole 311A circularly penetrated vertically is formed in the center of the base plate 311.
  • the lower plate 312 has a circular planar shape, and is installed in the upper surface of the base plate 311.
  • a plurality of first lower plate holes 312A and second lower plate holes 312B are formed at regular intervals so as to be penetrated vertically.
  • the lower plate 312 may be omitted according to the necessity of design.
  • the fixing block 313 is installed in the upper part of the lower plate 312.
  • the lower heating jig 314 is installed in the upper part of the fixing block 313.
  • a plurality of first fixing block holes 313A and second fixing block holes 313B are formed at regular interval so as to be penetrated vertically.
  • a plurality of pipe expansion plates 131C protruding upwardly are provided in the center of the fixing block 313. The plurality of pipe expansion plates 131C are inserted into the rotational shaft insertion hole 210 of the rotor core 200.
  • the lower heating jig 314 is a portion where the rotor core 200 is seated, and has a lower heating jig side wall 314-1 extending upwardly along the outer circumference of the lower heating jig 314.
  • a lower heating jig central hole 314-2 into which the pipe expansion plate 131C is penetrated is formed in the central part of the lower heating jig 314.
  • a plurality of first lower heating jig holes 314A and second lower heating jig holes 314B are formed at regular intervals so as to be penetrated vertically.
  • the rotor core 200 is seated in the upper surface of the lower heating jig 314, and a plurality of ejector pins 314C are installed in the upper surface of the lower heating jig 314 so that the plurality of ejector pins 314C contact the lower surface of the rotor core 200.
  • the ejector pin 314C pushes the lower surface of the rotor core 200 upwardly when ejecting the rotor core 200 after the process has been finished.
  • a lower heat conductive plate 310 is installed in the upper surface of the lower heating jig 314.
  • the lower heat conductive plate 310 contacts the lower surface of the rotor core 200.
  • the heat of the lower heating jig 314 heated by high-frequency heating is conducted towards the rotor core 200 by the lower heat conductive plate 310.
  • a plurality of first lower heat conductive plate holes 310A and second lower heat conductive plate holes 310B are formed at regular intervals so as to be penetrated vertically.
  • an ejector pin hole 310C is formed in a place corresponding to the ejector pin 314C so that the ejector pin 314C can penetrate.
  • the upper jig 32 of the present invention comprises an upper heating jig 321 and a cover plate 322 coupled to the upper part of the upper heating jig 321.
  • the upper heating jig 321 is coupled to the upper part of the lower heating jig 314.
  • the rotor core 200 is covered with the upper heating jig 321 while being seated in the lower heating jig 314.
  • An upper heating jig side wall 321-1 extending downwardly from the circumference of the upper heating jig 321 is formed in the upper heating jig 321.
  • the outer circumferential portion of the rotor core 200 is surrounded by the upper heating jig side wall 321-1 and the lower heating jig side wall 314-1.
  • An upper heating jig central hole 321-2 into which the pipe expansion rod 322C is penetrated is formed in the center of the upper heating jig 321.
  • a plurality of first upper heating jig holes 321A and second upper heating jig holes 321B are installed at regular intervals so as to be penetrated vertically.
  • a pressure plate 321C is installed in the lower surface of the upper heating jig 321, and the pressure plate 321C is installed to be elastically supported by a buffering member 321D installed in the upper part thereof.
  • the upper heat conductive plate 320 is installed in the lower surface of the pressure plate 321C so that the upper heat conductive plate 320 contacts the upper surface of the rotor core 200.
  • a plurality of first upper heat conductive plate holes 320A and second upper heat conductive plate holes 320B are installed at regular intervals to be penetrated vertically.
  • first pressure plate holes 321C-1 and second pressure plate holes 321C-2 are installed at regular intervals so as to be penetrated vertically. Additionally, holes are formed in places corresponding to the first pressure plate hole 321C-1 and the second pressure plate hole 321C-2 of the upper heat conductive plate 320, respectively.
  • first cover plate holes 322A and second cover plate holes 322B are installed at regular intervals to be penetrated vertically.
  • the pipe expansion rod 322C extending downwardly is provided in the center of the cover plate 322, and a handle 322C-1 is installed in the central upper part of the cover plate 322.
  • the rotor core 200 is surrounded between the lower heating jig 314 and upper heating jig 321.
  • the jig 30 is located in the induction heating unit 53 of Fig. 1, the jig 30 is rapidly heated by the high-frequency induction heating.
  • the lower heating jig 314 and upper heating jig 321 are directly heated by induction heating, thereby increasing the temperature, and the rotor core 200 located thereinside is not directly heated by induction heating but heated by the heat of the upper heating jig 321 and lower heating jig 314 conducted to the rotor core 200.
  • the heat of the lower heating jig 314 is conducted towards the lower part of the rotor core 200 through the lower heat conductive plate 310, and the heat of the upper heating jig 314 is conducted towards the upper part of the rotor core 200 through the upper heat conductive plate 320. Accordingly, in the case of rapidly heating the rotor core 200 directly by induction heating, the rotor core 200 may be prevented from being damaged. To this end, preferably, materials such as aluminum which are affected less by induction heating and have high heat conductivity are applied to the lower heat conductive plate 310 and upper heat conductive plate 320.
  • the rotor core 200 When the rotor core 200 is heated by heat conduction, the rotor core 200 is heat expanded. When the rotor core 200 is heat expanded, the horizontal heat expansion and vertical heat expansion need to be considered. Accordingly, the outer circumferential surface of the rotor core 200 should have a certain interval with the inside surface of the lower heating jig side wall 314-1 and upper heating jig side wall 321-1 without contacting each other, in response to the horizontal heat expansion. In response to vertical heat expansion, when the rotor core 200 is expanded in the vertical direction, the pressure plate 321C which presses the upper surface side of the rotor core 200 is supported by the buffering member 321D, and thus the pressure plate 321C is raised, thereby responding to the vertical heat expansion of the rotor core 200.
  • the jig 30 By passing the induction heating unit 53 as above, the jig 30 is overall get heated. When the jig 30 is located in the cooling unit 54 for the next process, the process of cooling the jig 30 is performed.
  • cool air is injected from the lower part of a base plate central hole 311A formed in the center of the base plate 311 of the jig 30 illustrated in Fig. 5.
  • the injected cool air escapes upwardly by passing the first lower plate hole 312A, the first fixing block hole 313A, the first lower heating jig hole 314A, the first lower heat conductive plate hole 310A, the first hole 220 of rotor core, the first upper heat conductive plate hole 320A, the first pressure plate hole 321C-1, the first upper heating jig hole 321A, and the first cover plate hole 322A.
  • the injected cool air escapes upwardly by passing the second lower plate hole 312B, the second fixing block hole 313B, the second lower heating jig hole 314B, the second lower heat conductive plate hole 310B, the second hole 230 of rotor core, the second upper heat conductive plate hole 320B, the second pressure plate hole 321C-2, the second upper heating jig hole 321B, and the second cover plate hole 322B.
  • Such cool air penetrating structure allows the inside of the jig 30 and rotor core 200 to be rapidly cooled.
  • the first lower plate hole 312A, the first fixing block hole 313A, the first lower heating jig hole 314A, and the first lower heat conductive plate hole 310A are formed to be in vertical communication with the first hole 220 of the rotor core.
  • the first upper heat conductive plate hole 320A, the first pressure plate hole 321C-1, the first upper heating jig hole 321A, and the first cover plate hole 322A are formed to be in vertical communication with the first hole 220 of the rotor core.
  • the second lower plate hole 312B, the second fixing block hole 313B, the second lower heating jig hole 314B, and the second lower heat conductive plate hole 310B are formed to be in vertical communication with the second hole 230 of the rotor core.
  • the second upper heat conductive plate hole 320B, the second pressure plate hole 321C-2, the second upper heating jig hole 321B, and the second cover plate hole 322B are formed to be in vertical communication with the second hole 230 of the rotor core.

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

Abstract

A jig for manufacturing a rotor core according to the present invention comprises a lower heating jig 314 in which a rotor core 200 is seated; a lower heating jig side wall 314-1 which extends upwardly around the lower heating jig 314 to cover a part of the outer circumferential surface of the rotor core 200; an upper heating jig 321 which covers the upper part of the rotor core 200; and an upper heating jig side wall 321-1 which extends upwardly around the upper heating jig 321 to cover the remaining part of the outer circumferential surface of the rotor core 200, wherein the outer circumferential surface of the rotor core 200 forms an interval with the inner circumferential surface of the lower heating jig side wall 314-1 and the upper heating jig side wall 321-1.

Description

JIG FOR MANUFACTURING ROTOR CORE OF MOTOR BY INDUCTION AND CONDUCTION HEATING
The present invention relates to a jig for heating used in a process for manufacturing a laminated core of a motor. More specifically, the present invention relates to a jig for manufacturing a rotor core capable of applying a high-frequency heating method and a conduction heating method in a process for manufacturing a rotor core, thereby improving the quality and productivity of products without damaging the rotor core.
In general, a stator or rotor of a motor is manufactured in the form of a laminated core. A laminated core is manufactured by laminating a plurality of laminar member made by forming an electrical steel strip continuously in a press device. A laminated laminar member needs to be bonded to a laminar member therebelow and a laminar member thereabove. A method of bonding laminar members is disclosed in Korean Patent No. 10-1811266.
The above prior art discloses a method of bonding core sheets to each other by forming and laminating a single sheet of laminar member in a press mold using a so-called self-bonding electrical steel strip coated with an adhesive layer on the electrical steel strip, and at the same time, heating the laminated core.
A laminated core having core sheets bonded to each other is obtained by thermally curing the adhesive layer between each core sheet by the heating in the press mold, and the manufactured laminated core is cooled through a cooling process to supply products.
Korean Patent Laid-Open No. 10-2021-0154779 discloses a technology of laminating a laminated core in a press mold, bonding an upper jig to a lower jig while positioning the laminated core on the lower jig, transferring the jigs through a conveyor, and performing high-frequency induction heating thereon. In this prior art, the induction heating method on a laminated core is heating a rotor core by performing induction heating on heating plates installed in the upper and lower sides of the rotor core using an induction coil.
However, the above prior art does not rapidly heat a laminated core when performing induction heating and cools the same through several steps, which may result in a decrease in productivity. Further, when increasing the induction heating rate, in many cases, a laminated core, particularly a rotor core, has a thin side wall structure in a portion into which a magnet is inserted, and thus rapid heating may damage the thin side wall portion by high-frequency heating.
In addition, as to the cooling process according to the above prior art, the outside of the laminated core and jigs is cooled to some degree by a blowing method or cool air supplying method, albeit cooled through several steps. However, considerable time is required to completely cool the laminated core to the inside. As such, the above prior art requires a prolonged cooling process even through it performs rapid heating in a high-frequency heating step, which results in a decrease in productivity.
In addition, it is difficult to rapidly cool the whole rotor core heated and laminated to the inside. Thus, thermal deformation occurring due to a high temperature by induction heating and dimensional error resulting therefrom may lead to a high defect rate of laminated core products and a degradation in quality.
Accordingly, the present inventor suggests a jig for manufacturing a rotor core with improved quality and productivity, capable of performing rapid heating by induction and conduction heating even though a laminated core, particularly a rotor core, has a thin side wall with a complicate structure, and performing rapid cooling to the inside of an upper jig and a lower jig and the rotor core seated therebetween using cool air with a low temperature, thereby preventing thermal deformation of the rotor core and jigs.
It is an object of the present invention to provide a jig for manufacturing a rotor core capable of rapidly heating the rotor core by induction heating and conduction heating while not damaging the rotor core.
It is another object of the present invention to provide a jig for manufacturing a rotor core capable of stably seating the rotor core between an upper jig and a lower jig, and rapidly cooling the upper jig, lower jig, and rotor core.
The objects above and other objects inferred therein can be easily achieved by the present invention explained below.
A jig for manufacturing a rotor core according to the present invention includes a lower heating jig 314 in which a rotor core 200 is seated; a lower heating jig side wall 314-1 which extends upwardly around the lower heating jig 314 to cover a part of the outer circumferential surface of the rotor core 200; an upper heating jig 321 which covers the upper part of the rotor core 200; and an upper heating jig side wall 321-1 which extends upwardly around the upper heating jig 321 to cover the remaining part of the outer circumferential surface of the rotor core 200, wherein the outer circumferential surface of the rotor core 200 forms an interval with the inner circumferential surface of the lower heating jig side wall 314-1 and the upper heating jig side wall 321-1.
In the present invention, a lower heat conductive plate 310 which is installed in the upper surface of the lower heating jig 314 and contacts the lower surface of the rotor core 200 may be further included.
In the present invention, an upper heat conductive plate 320 which is installed in the lower surface of the upper heating jig 321 and contacts the upper surface of the rotor core 200 may be further included.
In the present invention, it is preferable that the lower heat conductive plate 310 and upper heat conductive plate 320 are made of aluminum.
In the present invention, a pressure plate 321C which is installed in the lower surface of the upper heating jig 321 and is elastically supported by a buffering member 321D to press the upper surface of the rotor core 200 may be further included.
In the present invention, a plurality of ejector pins 314C which are installed in the upper surface of the lower heating jig 314 may be further included.
In the present invention, a plurality of first lower heating jig holes 314A are formed in the lower heating jig 314, a plurality of first upper heating jig holes 321A are formed in the upper heating jig 321, and the first lower heating jig hole 314A and the first upper heating jig hole 321A may be in vertical communication with a plurality of first holes 220 formed in the rotor core 200 at regular intervals.
In the present invention, a plurality of second lower heating jig holes 314B are formed in the lower heating jig 314, a plurality of second upper heating jig holes 321B are formed in the upper heating jig 321, and the second lower heating jig hole 314B and the second upper heating jig hole 321B may be in vertical communication with a plurality of second holes 230 formed in the rotor core 200 at regular intervals.
A jig for manufacturing a rotor core according to the present invention includes a base plate 311; a lower plate 312 which is installed in the upper part of the base plate 311; a fixing block 313 which is installed in the upper part of the lower plate 312; a lower heating jig 314 which is installed in the upper part of the fixing block 313; and a rotor core 200 which is seated in the upper part of the lower heating jig 314, wherein the upper surface of a lower heat conductive plate 310 installed in the upper part of the lower heating jig 314 contacts the bottom surface of the rotor core 200.
In the present invention, an upper heating jig 321 may be coupled to the upper part of the lower heating jig 314.
In the present invention, a lower heating jig side wall 314-1 extending upwardly is formed around the lower heating jig 314, an upper heating jig side wall 321-1 extending downwardly is formed around the upper heating jig 321, and the outer circumferential surface of the rotor core 200 may form a certain interval with the inner circumferential surface of the lower heating jig side wall 314-1 and the upper heating jig side wall 321-1.
The present invention provides a jig for manufacturing a rotor core with a novel structure capable of rapidly heating the rotor core without damaging the rotor core by applying induction heating and conduction heating methods, thereby improving productivity.
Also, the present invention allows a cool air supply hole formed in the upper jig and lower jig to be in vertical communication with a hole capable of passing the cool air of the rotor core so that the cool air with low temperature can be supplied and discharged, and accordingly the heated rotor core and jig are rapidly cooled, thereby preventing thermal deformation, improving the quality of the rotor core, and greatly improving productivity thereof.
Fig. 1 is a plan view illustrating the entire layout of an apparatus for manufacturing a laminated core of a motor for explaining a jig for manufacturing a rotor core according to the present invention;
Fig. 2 is a perspective view illustrating a jig for manufacturing a rotor core according to the present invention;
Fig. 3 is an exploded conceptual diagram illustrating a lower jig of a jig for manufacturing a rotor core according to the present invention;
Fig. 4 is an exploded conceptual diagram illustrating an upper jig of a jig for manufacturing a rotor core according to the present invention; and
Fig. 5 is a cross-sectional view of a jig for manufacturing a rotor core according to the present invention.
Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
Fig. 1 is a plan view illustrating the entire layout of an apparatus for manufacturing a laminated core of a motor for explaining a jig for manufacturing a rotor core according to the present invention. As illustrated in Fig. 1, a base material 100 of the rotor core used in the present invention, in which an adhesive coating layer 102 is formed on the front surface and back surface of an electrical steel strip 101, is a so-called self-bonding steel strip.
The base material 100 of the present invention is continuously supplied to an apparatus for manufacturing a laminated core, and is sequentially formed in a laminating unit 1, which is a progressive press machine, to be formed into a laminar member 201 in the form of a sheet. A plurality of formed laminar members 201 are laminated to be a rotor core 200.
A rotational shaft insertion hole 210 may be formed in the central part of the rotor core 200, and a first hole 220 and a second hole 230 may be formed around the rotational shaft insertion hole 210 in the outward direction. It is of course that these various shapes of holes may vary depending on the type of the rotor core.
The apparatus for manufacturing a laminated core of a motor to which the present invention is applied comprises a laminating unit 1 for forming the base material 100 into laminar members 201 to manufacture a laminated core, a pre-treatment unit 2 for coating an activator, etc. on the base material 100, a welding unit 3 for continuously connecting the base material supplied, an uncoil unit 4 for supplying the base material from a reel around which the base material is would, a post-treatment unit 5 for performing a process after the lamination, and a detection unit 6 for the final detection of a product.
The rotor core 200 manufactured by laminating the laminar members 201 manufactured by forming the base material 100 in the laminating unit 1 is placed on a discharge conveyor 10 installed at one side of the laminating unit 1. The rotor core 200 is transferred through the discharge conveyor 10 to one side of the post-processing unit 5 installed at one side of the discharge conveyor 10. The discharge conveyor 10 may be provided as a roller-type conveyor or a belt-type conveyor. The rotor core 200 transferred is transferred and seated above a lower jig 31 of a jig 30 in the post-treatment unit 5, and an upper jig 32 is coupled to the upper part of the lower jig 31.
The post-treatment unit 5 is a device for performing the collateral processing on the rotor core 200 in order to increase the product reliability of the rotor core 200 manufactured in the laminating unit 1, and comprises a process line 51, a return line 52, an induction heating unit 53, and a cooling unit 54. The jig 30 in which the rotor core 200 is seated moves along the process line 51 to go through heating and cooling processes. Next, after transferring the rotor core 200 to the detection unit 6, the empty jig 30 returns to its original place along the return line 52. The roller or belt type conveyor, etc. is installed in the process line 51 and the return line 52 so that the jig 30 can be transferred along the processing line.
The cooling unit 54 is a cooling device which is installed at one side of the induction heating unit 53 to cool the heated rotor core 200. A loading part 61 is a device for transferring the rotor core 200 which has finished the post-treatment in the process line 51 to the detection unit 6. The detection unit 6 detects the rotor core 200, and a shipping part 62 distinguishes good products from defective products for shipment.
Fig. 2 is a perspective view illustrating a jig 30 for manufacturing a rotor core according to the present invention. Referring to Fig. 2, the jig 30 according to the present invention includes a lower jig 31 and an upper jig 32. The upper jig 32 may be coupled to the upper part of the lower jig 31 while the rotor core 200 is seated in the lower jig 31. By seating the rotor core 200 in the upper part of the lower jig 31, the rotor core 200 may be stably transferred without the shaking while the jig 30 is transferred. The upper jig 32 is coupled to the upper part of the lower jig 31 in which the rotor core 200 is seated so as to maintain the state that the rotor core 200 is seated between the lower jig 31 and the upper jig 32.
The jig 30 according to the present invention is transferred along the process line 51, heated while passing the heating unit 53, and cooled in the cooling unit 54. The cooling process is performed in the state that the jig 30 enters a cooling room (not shown) of the cooling unit 54.
Fig. 3 is an exploded conceptual diagram illustrating a lower jig 31 of a jig 30 for manufacturing a rotor core according to the present invention, Fig. 4 is an exploded conceptual diagram illustrating an upper jig 32, and Fig. 5 is a cross-sectional view illustrating the state that the rotor core 200 is seated in the jig 30 according to the present invention.
Referring to Figs. 1 to 5 together, the lower jig 32 of the jig 30 according to the present invention moves along the processing lines such as the process line 51 and return line 52 in which the conveyor is installed. As illustrated in Fig. 3, in the lower jig 31, a base plate 311, a lower plate 312, a fixing block 313, and a lower heating jig 314 are sequentially coupled from the bottom.
As the base plate 311 has a square planar shape, the lower surface of the base plate 311 is placed on the conveyor, and the lower plate 312 is installed in the upper surface of the base plate 311. A base plate central hole 311A circularly penetrated vertically is formed in the center of the base plate 311. When the jig 30 moves to the cooling unit 54, cool air flows in through the base plate central hole 311A from the bottom of the base plate 311 and moves upwardly, thereby cooling the jig 30 and rotor core 200.
The lower plate 312 has a circular planar shape, and is installed in the upper surface of the base plate 311. In the lower plate 312, a plurality of first lower plate holes 312A and second lower plate holes 312B are formed at regular intervals so as to be penetrated vertically. The lower plate 312 may be omitted according to the necessity of design.
The fixing block 313 is installed in the upper part of the lower plate 312. The lower heating jig 314 is installed in the upper part of the fixing block 313. In the fixing block 313, a plurality of first fixing block holes 313A and second fixing block holes 313B are formed at regular interval so as to be penetrated vertically. A plurality of pipe expansion plates 131C protruding upwardly are provided in the center of the fixing block 313. The plurality of pipe expansion plates 131C are inserted into the rotational shaft insertion hole 210 of the rotor core 200. When a pipe expansion rod 322C of the upper jig 32 is inserted into the central part of the plurality of pipe expansion plates 131C, the plurality of pipe expansion plates 131C press the inside surface of the rotational shaft insertion hole 210 of the rotor core 200 while expanding in the circumferential direction, and thereby the rotor core 200 may be stably seated in the lower jig 31.
The lower heating jig 314 is a portion where the rotor core 200 is seated, and has a lower heating jig side wall 314-1 extending upwardly along the outer circumference of the lower heating jig 314. A lower heating jig central hole 314-2 into which the pipe expansion plate 131C is penetrated is formed in the central part of the lower heating jig 314. In the lower heating jig 314, a plurality of first lower heating jig holes 314A and second lower heating jig holes 314B are formed at regular intervals so as to be penetrated vertically. The rotor core 200 is seated in the upper surface of the lower heating jig 314, and a plurality of ejector pins 314C are installed in the upper surface of the lower heating jig 314 so that the plurality of ejector pins 314C contact the lower surface of the rotor core 200. The ejector pin 314C pushes the lower surface of the rotor core 200 upwardly when ejecting the rotor core 200 after the process has been finished.
A lower heat conductive plate 310 is installed in the upper surface of the lower heating jig 314. The lower heat conductive plate 310 contacts the lower surface of the rotor core 200. The heat of the lower heating jig 314 heated by high-frequency heating is conducted towards the rotor core 200 by the lower heat conductive plate 310. In the lower heat conductive plate 310, a plurality of first lower heat conductive plate holes 310A and second lower heat conductive plate holes 310B are formed at regular intervals so as to be penetrated vertically. Additionally, in the lower heat conductive plate 310, an ejector pin hole 310C is formed in a place corresponding to the ejector pin 314C so that the ejector pin 314C can penetrate.
As illustrated in Fig. 4, the upper jig 32 of the present invention comprises an upper heating jig 321 and a cover plate 322 coupled to the upper part of the upper heating jig 321. The upper heating jig 321 is coupled to the upper part of the lower heating jig 314. The rotor core 200 is covered with the upper heating jig 321 while being seated in the lower heating jig 314. An upper heating jig side wall 321-1 extending downwardly from the circumference of the upper heating jig 321 is formed in the upper heating jig 321. The outer circumferential portion of the rotor core 200 is surrounded by the upper heating jig side wall 321-1 and the lower heating jig side wall 314-1. An upper heating jig central hole 321-2 into which the pipe expansion rod 322C is penetrated is formed in the center of the upper heating jig 321.
In the upper heating jig 321 of the upper jig 32, a plurality of first upper heating jig holes 321A and second upper heating jig holes 321B are installed at regular intervals so as to be penetrated vertically. A pressure plate 321C is installed in the lower surface of the upper heating jig 321, and the pressure plate 321C is installed to be elastically supported by a buffering member 321D installed in the upper part thereof. When the upper jig 32 is coupled to the lower jig 31, the pressure plate 321C is installed to press the upper surface of the rotor core 200. The upper heat conductive plate 320 is installed in the lower surface of the pressure plate 321C so that the upper heat conductive plate 320 contacts the upper surface of the rotor core 200. In the upper heat conductive plate 320, a plurality of first upper heat conductive plate holes 320A and second upper heat conductive plate holes 320B are installed at regular intervals to be penetrated vertically.
In the pressure plate 321C, a plurality of first pressure plate holes 321C-1 and second pressure plate holes 321C-2 are installed at regular intervals so as to be penetrated vertically. Additionally, holes are formed in places corresponding to the first pressure plate hole 321C-1 and the second pressure plate hole 321C-2 of the upper heat conductive plate 320, respectively.
In the cover plate 322, a plurality of first cover plate holes 322A and second cover plate holes 322B are installed at regular intervals to be penetrated vertically. The pipe expansion rod 322C extending downwardly is provided in the center of the cover plate 322, and a handle 322C-1 is installed in the central upper part of the cover plate 322.
As illustrated in Fig. 5, in the present invention, the rotor core 200 is surrounded between the lower heating jig 314 and upper heating jig 321. When the jig 30 is located in the induction heating unit 53 of Fig. 1, the jig 30 is rapidly heated by the high-frequency induction heating. In this case, the lower heating jig 314 and upper heating jig 321 are directly heated by induction heating, thereby increasing the temperature, and the rotor core 200 located thereinside is not directly heated by induction heating but heated by the heat of the upper heating jig 321 and lower heating jig 314 conducted to the rotor core 200.
The heat of the lower heating jig 314 is conducted towards the lower part of the rotor core 200 through the lower heat conductive plate 310, and the heat of the upper heating jig 314 is conducted towards the upper part of the rotor core 200 through the upper heat conductive plate 320. Accordingly, in the case of rapidly heating the rotor core 200 directly by induction heating, the rotor core 200 may be prevented from being damaged. To this end, preferably, materials such as aluminum which are affected less by induction heating and have high heat conductivity are applied to the lower heat conductive plate 310 and upper heat conductive plate 320.
When the rotor core 200 is heated by heat conduction, the rotor core 200 is heat expanded. When the rotor core 200 is heat expanded, the horizontal heat expansion and vertical heat expansion need to be considered. Accordingly, the outer circumferential surface of the rotor core 200 should have a certain interval with the inside surface of the lower heating jig side wall 314-1 and upper heating jig side wall 321-1 without contacting each other, in response to the horizontal heat expansion. In response to vertical heat expansion, when the rotor core 200 is expanded in the vertical direction, the pressure plate 321C which presses the upper surface side of the rotor core 200 is supported by the buffering member 321D, and thus the pressure plate 321C is raised, thereby responding to the vertical heat expansion of the rotor core 200.
By passing the induction heating unit 53 as above, the jig 30 is overall get heated. When the jig 30 is located in the cooling unit 54 for the next process, the process of cooling the jig 30 is performed.
In the cooling unit 54, cool air is injected from the lower part of a base plate central hole 311A formed in the center of the base plate 311 of the jig 30 illustrated in Fig. 5. The injected cool air escapes upwardly by passing the first lower plate hole 312A, the first fixing block hole 313A, the first lower heating jig hole 314A, the first lower heat conductive plate hole 310A, the first hole 220 of rotor core, the first upper heat conductive plate hole 320A, the first pressure plate hole 321C-1, the first upper heating jig hole 321A, and the first cover plate hole 322A. Additionally, the injected cool air escapes upwardly by passing the second lower plate hole 312B, the second fixing block hole 313B, the second lower heating jig hole 314B, the second lower heat conductive plate hole 310B, the second hole 230 of rotor core, the second upper heat conductive plate hole 320B, the second pressure plate hole 321C-2, the second upper heating jig hole 321B, and the second cover plate hole 322B. Such cool air penetrating structure allows the inside of the jig 30 and rotor core 200 to be rapidly cooled.
For the flow of the cool air, the first lower plate hole 312A, the first fixing block hole 313A, the first lower heating jig hole 314A, and the first lower heat conductive plate hole 310A are formed to be in vertical communication with the first hole 220 of the rotor core. Also, the first upper heat conductive plate hole 320A, the first pressure plate hole 321C-1, the first upper heating jig hole 321A, and the first cover plate hole 322A are formed to be in vertical communication with the first hole 220 of the rotor core.
Likewise, the second lower plate hole 312B, the second fixing block hole 313B, the second lower heating jig hole 314B, and the second lower heat conductive plate hole 310B are formed to be in vertical communication with the second hole 230 of the rotor core. Additionally, the second upper heat conductive plate hole 320B, the second pressure plate hole 321C-2, the second upper heating jig hole 321B, and the second cover plate hole 322B are formed to be in vertical communication with the second hole 230 of the rotor core.
The detailed description of the present invention described as above simply explains examples for understanding the present invention, but does not intend to limit the scope of the present invention. The scope of the present invention is defined by the accompanying claims. Additionally, it should be construed that simple modifications or changes of the present invention fall within the scope of the present invention.

Claims (13)

  1. A jig for manufacturing a rotor core, comprising:
    a lower heating jig 314 in which a rotor core 200 is seated;
    a lower heating jig side wall 314-1 which extends upwardly around the lower heating jig 314 to cover a part of the outer circumferential surface of the rotor core 200;
    an upper heating jig 321 which covers the upper part of the rotor core 200; and
    an upper heating jig side wall 321-1 which extends upwardly around the upper heating jig 321 to cover the remaining part of the outer circumferential surface of the rotor core 200,
    wherein the outer circumferential surface of the rotor core 200 forms an interval with the inner circumferential surface of the lower heating jig side wall 314-1 and the upper heating jig side wall 321-1.
  2. The jig of claim 1, further comprising:
    a lower heat conductive plate 310 which is installed in the upper surface of the lower heating jig 314 and contacts the lower surface of the rotor core 200.
  3. The jig of claim 2, further comprising:
    an upper heat conductive plate 320 which is installed in the lower surface of the upper heating jig 321 and contacts the upper surface of the rotor core 200.
  4. The jig of claim 2 or 3, wherein the lower heat conductive plate 310 and upper heat conductive plate 320 are made of aluminum.
  5. The jig of claim 1, further comprising:
    a pressure plate 321C which is installed in the lower surface of the upper heating jig 321 and is elastically supported by a buffering member 321D to press the upper surface of the rotor core 200.
  6. The jig of claim 1, further comprising:
    a plurality of ejector pins 314C which are installed in the upper surface of the lower heating jig 314.
  7. The jig of claim 1, wherein a plurality of first lower heating jig holes 314A are formed in the lower heating jig 314, a plurality of first upper heating jig holes 321A are formed in the upper heating jig 321, and the first lower heating jig hole 314A and the first upper heating jig hole 321A are in vertical communication with a plurality of first holes 220 formed in the rotor core 200 at regular intervals.
  8. The jig of claim 7, wherein a plurality of second lower heating jig holes 314B are formed in the lower heating jig 314, a plurality of second upper heating jig holes 321B are formed in the upper heating jig 321, and the second lower heating jig hole 314B and the second upper heating jig hole 321B are in vertical communication with a plurality of second holes 230 formed in the rotor core 200 at regular intervals.
  9. A jig for manufacturing a rotor core, comprising:
    a base plate 311;
    a lower plate 312 which is installed in the upper part of the base plate 311;
    a fixing block 313 which is installed in the upper part of the lower plate 312;
    a lower heating jig 314 which is installed in the upper part of the fixing block 313; and
    a rotor core 200 which is seated in the upper part of the lower heating jig 314,
    wherein the upper surface of a lower heat conductive plate 310 installed in the upper part of the lower heating jig 314 contacts the bottom surface of the rotor core 200.
  10. The jig of claim 9, wherein an upper heating jig 321 is coupled to the upper part of the lower heating jig 314.
  11. The jig of claim 10, wherein a lower heating jig side wall 314-1 extending upwardly is formed around the lower heating jig 314, an upper heating jig side wall 321-1 extending downwardly is formed around the upper heating jig 321, and the outer circumferential surface of the rotor core 200 forms a certain interval with the inner circumferential surface of the lower heating jig side wall 314-1 and the upper heating jig side wall 321-1.
  12. The jig of claim 10, wherein a plurality of first lower heating jig holes 314A are formed in the lower heating jig 314, a plurality of first upper heating jig holes 321A are formed in the upper heating jig 321, and the first lower heating jig hole 314A and the first upper heating jig hole 321A are in vertical communication with a plurality of first holes 220 formed in the rotor core 200 at regular intervals.
  13. The jig of claim 12, wherein a plurality of second lower heating jig holes 314B are formed in the lower heating jig 314, a plurality of second upper heating jig holes 321B are formed in the upper heating jig 321, and the second lower heating jig hole 314B and the second upper heating jig hole 321B are in vertical communication with a plurality of second holes 230 formed in the rotor core 200 at regular intervals.
PCT/KR2023/011571 2022-08-08 2023-08-07 Jig for manufacturing rotor core of motor by induction and conduction heating WO2024035031A1 (en)

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KR1020220098350A KR20240020406A (en) 2022-08-08 2022-08-08 Jig for manufacturing rotor core of motor by induction and conduction heating
KR10-2022-0098350 2022-08-08

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016197972A (en) * 2015-04-06 2016-11-24 日産自動車株式会社 Stator manufacturing device, and method of manufacturing stator
KR20180020015A (en) * 2016-08-17 2018-02-27 주식회사 고아정공 Jig for manufacturing motor core
KR101860933B1 (en) * 2017-04-11 2018-05-24 (주)항남 Centrifugal Casting Apparatus for Manufacturing Rotor of Motor
KR20180069291A (en) * 2016-12-15 2018-06-25 주식회사 포스코 Apparatus and method to induction heating
KR20210154777A (en) * 2021-06-17 2021-12-21 주식회사 웰탑테크노스 Bonding jig for laminated core of electric motor
KR20220049224A (en) * 2020-10-14 2022-04-21 (주)태화기업 Resin Molding Apparatus for Magnets of Rotor Core

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016197972A (en) * 2015-04-06 2016-11-24 日産自動車株式会社 Stator manufacturing device, and method of manufacturing stator
KR20180020015A (en) * 2016-08-17 2018-02-27 주식회사 고아정공 Jig for manufacturing motor core
KR20180069291A (en) * 2016-12-15 2018-06-25 주식회사 포스코 Apparatus and method to induction heating
KR101860933B1 (en) * 2017-04-11 2018-05-24 (주)항남 Centrifugal Casting Apparatus for Manufacturing Rotor of Motor
KR20220049224A (en) * 2020-10-14 2022-04-21 (주)태화기업 Resin Molding Apparatus for Magnets of Rotor Core
KR20210154777A (en) * 2021-06-17 2021-12-21 주식회사 웰탑테크노스 Bonding jig for laminated core of electric motor

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