WO2022260448A1 - 변압기 철심 및 그 제조방법 - Google Patents
변압기 철심 및 그 제조방법 Download PDFInfo
- Publication number
- WO2022260448A1 WO2022260448A1 PCT/KR2022/008124 KR2022008124W WO2022260448A1 WO 2022260448 A1 WO2022260448 A1 WO 2022260448A1 KR 2022008124 W KR2022008124 W KR 2022008124W WO 2022260448 A1 WO2022260448 A1 WO 2022260448A1
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- WIPO (PCT)
- Prior art keywords
- electrical steel
- steel sheet
- iron core
- yoke
- leg
- Prior art date
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 116
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 17
- 229910000976 Electrical steel Inorganic materials 0.000 claims abstract description 138
- 230000008878 coupling Effects 0.000 claims abstract description 19
- 238000010168 coupling process Methods 0.000 claims abstract description 19
- 238000005859 coupling reaction Methods 0.000 claims abstract description 19
- 239000007767 bonding agent Substances 0.000 claims description 27
- 238000000034 method Methods 0.000 claims description 23
- 239000000853 adhesive Substances 0.000 claims description 13
- 230000001070 adhesive effect Effects 0.000 claims description 13
- 238000005520 cutting process Methods 0.000 claims description 13
- 238000010030 laminating Methods 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 5
- 230000000052 comparative effect Effects 0.000 description 14
- 229910052742 iron Inorganic materials 0.000 description 11
- 238000003475 lamination Methods 0.000 description 6
- 238000003825 pressing Methods 0.000 description 6
- 230000000149 penetrating effect Effects 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 230000008602 contraction Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000004907 flux Effects 0.000 description 3
- 238000004080 punching Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 1
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical group C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 description 1
- 229910001224 Grain-oriented electrical steel Inorganic materials 0.000 description 1
- 229910000565 Non-oriented electrical steel Inorganic materials 0.000 description 1
- 206010044565 Tremor Diseases 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 229920006332 epoxy adhesive Polymers 0.000 description 1
- 208000013210 hematogenous Diseases 0.000 description 1
- 230000002489 hematologic effect Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000005381 magnetic domain Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/24—Magnetic cores
- H01F27/245—Magnetic cores made from sheets, e.g. grain-oriented
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/33—Arrangements for noise damping
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0206—Manufacturing of magnetic cores by mechanical means
- H01F41/0233—Manufacturing of magnetic circuits made from sheets
Definitions
- the present invention relates to a transformer core with low no-load loss and no-load noise and a manufacturing method thereof.
- a transformer is a device that changes alternating voltage and current values by using electromagnetic induction, and is one of the essential components for electronic products.
- a transformer is manufactured by winding a coil, which is an electrical conductor, around a magnetic iron core. At this time, an electrical steel sheet with low magnetic loss is used as an iron core, and this iron core is divided into hematogenous iron core and wound iron core.
- the main characteristics of transformers include loss and noise.
- no-load loss and no-load noise which are power losses that occur every moment regardless of whether the transformer is used or not, are institutionally regulated. Accordingly, various methods for reducing no-load loss and no-load noise have been suggested.
- Korean Patent Registration No. 1302830 discloses an example of a step lap iron core. This technology can increase the structural rigidity of the iron core by stacking the electrical steel sheets to form a spaced portion in a W shape along the thickness direction of the iron core when forming the coupling part of the iron core by stacking the electrical steel sheets.
- each electrical steel sheet extends perpendicularly to the laminated surface of the electrical steel sheet to form a stepped spaced portion perpendicular to the other electrical steel sheet adjacent to it, and penetrates the iron core to fix the assembled state of the iron core.
- a hall is needed.
- an object of the present invention is to provide a transformer core with low no-load loss and no-load noise and a method for manufacturing the same.
- a transformer iron core according to the present invention includes a pair of yokes formed by stacking a plurality of electrical steel sheets and parallel to each other; and a leg formed by stacking a plurality of electrical steel sheets and connecting a pair of the yokes, wherein an end of the electrical steel sheet constituting the yoke and the leg are configured at a coupling portion where the yoke and the leg are connected.
- the ends of the electrical steel sheets to have inclined surfaces corresponding to each other, the inclined surfaces are shape-fitted, and one electrical steel sheet constituting the yoke is laminated to another electrical steel sheet constituting the yoke in a step-lap manner, constituting the leg.
- One electrical steel sheet may be laminated to another electrical steel sheet constituting the leg in a step-lap manner.
- a method for manufacturing a transformer iron core according to the present invention includes preparing a plurality of electrical steel sheets and processing the electrical steel sheets into shapes of yokes and legs; forming an iron core laminate by partially applying an insulating adhesive to the electrical steel sheets and stacking them; and heat-treating the iron core laminate in a state in which pressure is applied, wherein the processing step includes forming an inclined surface by obliquely cutting or cutting an end portion of the electrical steel sheet, and forming the iron core laminate
- the processing step includes forming an inclined surface by obliquely cutting or cutting an end portion of the electrical steel sheet, and forming the iron core laminate
- the processing step includes forming an inclined surface by obliquely cutting or cutting an end portion of the electrical steel sheet, and forming the iron core laminate
- another electrical steel sheet constituting the leg can be laminated in a step-lap method.
- the no-load loss of the transformer is lowered and the no-load noise is reduced, so that the effect of improving the performance of the transformer can be obtained.
- FIG. 1 is a perspective view showing an iron core of a transformer according to an embodiment of the present invention.
- Figure 2 is a view of the coupling part of the step lap iron core viewed from the direction A of Figure 1, (a) a conventional iron core, (b) and (c) show the laminated state of electrical steel sheets in the iron core of the present invention.
- FIG. 3 is a diagram showing an adhesive application area in a transformer iron core according to an embodiment of the present invention.
- the primary coil is connected to an input circuit whose voltage is to be changed
- the secondary coil is connected to an output circuit in which the changed voltage is used.
- magnetic energy is used to connect the electrical energy of the primary coil and the secondary coil to each other.
- no-load characteristic occurs constantly regardless of whether the transformer is operating as when there is no load.
- the power loss consumed in the iron core is called no-load loss, and the noise generated at this time is called no-load noise.
- load characteristics occur when power is used in a load connected to the secondary coil, load loss is determined by Joule loss consumed in the coil, and load noise appears due to electromagnetic force between the coil and the iron core.
- an electrical steel sheet having low iron loss may be used as an iron core. Since core loss increases as the thickness of the electrical steel sheet increases, it is preferable to select an electrical steel sheet having a thickness as thin as possible.
- the assembly is not smooth at the coupling part of the step lap iron core, which becomes a major obstacle to the manufacture of the transformer and significantly lowers the manufacturing speed, that is, productivity.
- the fastening state of the coupling part is uneven, fine vibration becomes severe and noise is rapidly deteriorated.
- the present applicant intends to propose the present invention by studying a method for reducing no-load noise as well as lowering no-load loss by identifying and improving the cause of rapidly deteriorating noise in the iron core of a transformer.
- FIG. 1 is a perspective view showing an iron core of a transformer according to an embodiment of the present invention.
- Transformer iron core includes an upper yoke 11, a lower yoke 12, and a plurality of legs 2 disposed between the upper yoke and the lower yoke and connecting the upper yoke and the lower yoke. can do.
- the upper yoke 11 and the lower yoke 12 are selectively referred to as the yoke 1.
- the upper yoke 11 and/or the lower yoke 12 may be integrally formed with one of the plurality of legs 2 .
- the yoke 1 and the leg 2 are formed by stacking a plurality of electrical steel sheets 3, respectively. To this end, first, two or more electrical steel sheets are prepared, and each electrical steel sheet is processed into a cross-sectional shape of a yoke or leg of an iron core.
- the electrical steel sheet may have the same cross-sectional shape as the upper yoke 11 , the lower yoke 12 , and the plurality of legs 2 .
- the electrical steel sheet 3 used in the core of the transformer of the present invention is not particularly limited, and a grain-oriented electrical steel sheet or a non-oriented electrical steel sheet having a thickness of approximately 0.05 to 1.0 mm may be employed.
- the thickness of the electrical steel sheet 3 When the thickness of the electrical steel sheet 3 is less than 0.15 mm, iron loss is reduced but shape stability is deteriorated. On the other hand, if the thickness of the electrical steel sheet 3 is thicker than 1.0 mm. iron loss increases. Considering these points, the thickness of the electrical steel sheet may be limited to approximately 0.05 to 1.0 mm.
- Figure 2 is a view of the coupling part of the step lap iron core viewed from the direction A of Figure 1, (a) a conventional iron core, (b) and (c) show the laminated state of electrical steel sheets in the iron core of the present invention.
- FIG. 2(a) is a view showing a conventional iron core coupling part, and the ends are cut so that the cut surface 32 of each electrical steel sheet 3 extends at right angles to the laminated surface 31 of the electrical steel sheet.
- the magnetic field has the property of flowing to the place where the magnetic resistance is the least.
- Magnetic resistance is inversely proportional to magnetic permeability, which is an indicator of how smoothly a magnetic field flows.
- magnetic permeability is hundreds to tens of thousands of times that of electrical steel, so magnetic resistance becomes very high after leaving electrical steel.
- the gap between the electrical steel sheets stacked in the thickness direction of the electrical steel sheet 3, that is, the air gap (G) in which the electrical steel sheets face each other laterally is much wider than the air layer (L). Accordingly, the magnetic resistance becomes larger in the air gap than in the air layer.
- the magnetic field is concentrated in the contact area Lct shown in (a) of FIG. 2 and the magnetic flux density rapidly increases.
- the bottleneck phenomenon of the magnetic field generates a complex magnetic field containing various harmonics in the sine wave.
- the iron loss of the electrical steel sheet 3 increases as the magnetic flux density increases, and the iron loss increase increases rapidly when harmonics are included.
- the contact area Lct may be defined as an area where an end of the electrical steel sheet of the yoke and an end of the electrical steel sheet of the leg contact and overlap each other in a path through which the magnetic field flows.
- the length of the contact area Lct can be extended in (a) of FIG.
- the exposed portion is increased.
- the non-overlapping region Lov may be defined as a region in which the position of either end of the electrical steel sheet of the yoke or the electrical steel sheet of the leg is changed based on the gap G.
- the non-overlapping area may include an air gap.
- the method of increasing the length of the non-overlapping region (Lov) has limitations in its application.
- the length of the non-overlapping region (Lov) is usually managed within 2 to 6 mm in the hematode core of a transformer.
- the end portion corresponding to the coupling part 4 of the iron core in each electrical steel sheet is formed to have an inclined surface 33 by cutting or cutting to have a predetermined angle with respect to the laminated surface 31 of the electrical steel sheet.
- the inclined surface 33 may be formed, for example, by grinding the ends corresponding to the coupling part 4 of the iron core in the upper yoke 11, the lower yoke 12, and the plurality of legs 2. have.
- the inclined surfaces formed on the upper yoke and the leg or the lower yoke and the leg may be formed to be symmetrical to each other and arranged to correspond to each other to be shape-fitted.
- an insulating bonding agent 5 is applied to the inclined surface 33 of the cut electrical steel sheet 3 or around the inclined surface.
- the bonding agent it is good to measure a certain amount and apply it evenly so that it can be sufficiently applied to the inclined surface or its surroundings.
- any bonding agent capable of bonding electrical steel sheets to each other can be applied.
- a bonding agent usable at high temperatures for example, an epoxy adhesive or a ceramic adhesive having excellent insulating properties may be used.
- the application method is not limited, but the application area of the bonding agent 5 is around the coupling part 4 of the iron core, that is, the inclined surface 33 of each electrical steel sheet 3 or By confining it to its periphery, it is possible to avoid the occurrence of the above-mentioned curvature.
- the bonding agent 5 may be applied to an area constituting a right triangle on the electrical steel sheet 3 as well as the inclined surface 33 with the diagonal of the coupling part 4 as the hypotenuse. This example is shown in (a) of FIG. 3, and (b) of FIG. 3 shows an example in which the bonding agent is applied only to the inclined surface.
- the bonding agent 5 in the transformer core when applying the bonding agent 5 in the transformer core according to an embodiment of the present invention, the bonding agent is not applied to the entire laminated surface of the electrical steel sheet as in the prior art, but in FIGS. 3(a) and (b) As shown, it is possible to fix the iron core so that no bending occurs in the electrical steel sheet 3 by partially applying it around the coupling portion 4 of the iron core.
- the bonding agent 5 is applied in an amount within about 0.2 to 5.0 g/mm 2 . If the amount of bonding agent is less than 0.2 g/mm 2 , adhesive strength is weak, resulting in defects in fixing the iron core, and if it is greater than 5.0 g/mm 2 , the space rate of the iron core is lowered, which increases iron loss and noise.
- the space factor means a ratio occupied by an area of an effective part among a predetermined space area, and in the present invention means an effective area where a magnetic field is generated out of the total area of an electrical steel sheet constituting an iron core.
- the space factor When the space factor is applied with an insulating material, the space factor decreases by the space occupied by the insulating material.
- the electrical steel sheet 3 may be stacked in a step-lap method.
- one electrical steel sheet 3 constituting the yoke 1 is laminated on another electrical steel sheet constituting the yoke in a step-lap method, and one electrical steel sheet 3 constituting the leg 2 ) may be laminated in a step-lap manner on another electrical steel sheet constituting the leg.
- Ends of the electrical steel sheets 3 constituting the yoke 1 may be stacked, for example, in an offset form repeating in a stair form or in a form in which inclined surfaces 33 of the ends are arranged in a misaligned manner.
- the ends of the electrical steel sheets 3 constituting the leg 2 may be stacked, for example, in an offset form repeated in a stair form or in a form in which the inclined surfaces 33 of the ends are arranged in a misaligned manner.
- step-lap iron core in which a plurality of electrical steel sheets are stacked in 6 steps.
- This step-lap method has excellent efficiency and low loss compared to other lamination methods (for example, miter lamination methods) applied to transformer iron cores.
- the optimum number of steps in the step lap iron core may vary depending on the size and shape of the iron core, but the number of steps suitable for the hematological core of the transformer may be 3 to 10 steps, and in some cases, 4 to 7 steps.
- the contact area (Lct ) is preferably laminated in the direction in which the To this end, the electrical steel sheets may be stacked such that the length of the contact area Lct is at least longer than the length of the inclined surface 32 projected onto the laminated surface 31 .
- an iron core laminate can be obtained by arranging electrical steel sheets 3 cut into yokes 1 and electrical steel sheets 3 cut into legs 2 according to the final shape of the iron core, and bonding and stacking them.
- a yoke laminate is obtained by laminating electrical steel sheets 3 cut into yokes 1
- a leg laminate is obtained by laminating electrical steel plates 3 cut into legs 2.
- an iron core laminate may be obtained by assembling and bonding the yoke laminate and the leg laminate.
- a hole penetrating the iron core and a hole punching process for forming the hole may be omitted in order to fix the assembled state of the iron core.
- the transformer iron core according to an embodiment of the present invention can prevent damage to the magnetic properties of the electrical steel sheet caused by the hole. have.
- both sides of the iron core laminate in the thickness direction are clamped with a clamp and pressed with a pressure within 0.01 to 0.8 MPa. If the pressing force is less than 0.01 MPa, the binding force of the iron core is weak and can be separated when the transformer is operated for a long time. On the other hand, if it exceeds 0.8 MPa, the noise increases due to the compressive stress of the electrical steel sheet.
- the temperature of the iron core laminate is maintained within the range of 70 to 180° C. for at least 20 minutes or more.
- This heat treatment can be performed with any heater or oven, such as an induction for example.
- thermosetting resin-based adhesive when used as a bonding agent, since the adhesive contains an epoxy or urethane component, it is not cured at less than 70 ° C., but the adhesive strength is weakened when it exceeds 180 ° C.
- the no-load loss and no-load noise were compared after fabricating the transformer iron core having the same weight by the conventional manufacturing method and the manufacturing method of the present invention.
- Table 1 As shown in FIG. 2, the characteristics of transformer cores fabricated by different cutting and lamination methods constituting the coupling part of the iron core are compared. However, holes penetrating all the cores were formed and bolts were fastened to the holes to fix the cores.
- Comparative Example 1 the cut surface of each electrical steel sheet was formed to extend perpendicularly to the laminated surface of the electrical steel sheet, and the electrical steel sheets were laminated in a step-lap manner as in the prior art.
- Inventive Example 1 and Comparative Example 2 were laminated in the same step-lap method as Comparative Example 1, and the iron core was fixed by fastening bolts to the holes.
- Inventive Example 1 was configured as shown in FIG. 2 (b), and Comparative Example 2 was configured as shown in FIG. 2 (c). In other words, Inventive Example 1 was laminated in a direction in which the contact area (Lct) was enlarged, and Comparative Example 2 was laminated in a direction in which the contact area (Lct) was reduced.
- Inventive Example 1 Based on the no-load loss of Inventive Example 1, that is, Inventive Example 1 was taken as 100%, and the value of no-load noise was expressed in decibels (dBA), which is a log conversion value reflecting the audible response.
- dBA decibels
- Inventive Example 1 The reason for the excellent characteristics of Inventive Example 1 is that the bottleneck phenomenon of the magnetic field is alleviated by the inclined plane and the generation of harmonics is reduced.
- Inventive Example 3 and Comparative Example 4 the bonding agent was applied to the inclined surface as shown in FIG. However, inventive example 3 was pressurized at 0.8 MPa, and in comparative example 4, the pressurized pressure was increased at 0.9 MPa.
- Comparative Example 3 eliminates the hole penetrating the iron core and applies the bonding agent to the entire laminated surface to bond, resulting in a no-load loss of 3.7 compared to Inventive Example 1. % decrease, but the no-load noise is much worse than that of Inventive Example 1.
- holes penetrating the iron core can be eliminated, the gap between the electrical steel sheets can be minimized, and at the same time, the flow of the magnetic field can be made smooth at the coupling part of the iron core.
- the no-load loss of the transformer is lowered and the no-load noise is reduced, so that the performance of the transformer can be improved.
- bonding agent 11 upper yoke
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Abstract
Description
구분 | 재단 및 적층방법 | 무부하 손실 | 무부하 소음 |
비교예1 | 도 2의 (a) | 102.8% | 62.7dBA |
발명예1 | 도 2의 (b) | 100% | 60.8dBA |
비교예2 | 도 2의 (c) | 103.9% | 63.2dBA |
구분 | 접합제 도포영역 및 가압력 | 무부하 손실 | 무부하 소음 |
비교예 3 | 적층면 전체 + 5MPa | 96.3% | 68.9dBA |
발명예 2 | 도 3의 (a) + 0.5MPa | 96.2% | 57.2dBA |
발명예 3 | 도 3의 (b) + 0.8MPa | 96.1% | 56.1dBA |
비교예 4 | 도 3의 (b) + 0.9MPa | 96.2% | 62.2dBA |
Claims (12)
- 복수의 전기강판이 적층되어 형성되고, 서로 평행한 한 쌍의 요크; 및복수의 전기강판이 적층되어 형성되고, 한 쌍의 상기 요크를 연결하는 레그를 포함하고,상기 요크와 상기 레그가 연결되는 결합부에서, 상기 요크를 구성하는 전기강판의 단부와 상기 레그를 구성하는 전기강판의 단부는 서로 대응되는 경사면을 갖추어, 상기 경사면이 형상맞춤되고,상기 요크를 구성하는 하나의 전기강판은 상기 요크를 구성하는 다른 전기강판에 스텝 랩(step lap) 방식으로 적층되고, 상기 레그를 구성하는 하나의 전기강판은 상기 레그를 구성하는 다른 전기강판에 스텝 랩 방식으로 적층된 변압기 철심.
- 제1항에 있어서,상기 결합부에서, 상기 전기강판의 경사면 또는 상기 경사면 주변에 절연성 접합제가 도포된 변압기 철심.
- 제2항에 있어서,상기 경사면 주변은, 상기 전기강판 상에서 상기 결합부의 대각선을 빗변으로 하여 직각삼각형을 구성하는 영역을 포함하는 변압기 철심.
- 제1항에 있어서,상기 전기강판은, 상기 요크의 전기강판 단부와 상기 레그의 전기강판 단부가 접촉하여 겹쳐지는 접촉영역의 길이가, 적어도 상기 경사면이 상기 전기강판의 적층면에 투영된 길이보다 길게 되도록 적층된 변압기 철심.
- 복수의 전기강판을 준비하고, 상기 전기강판을 요크와 레그의 형상으로 가공하는 단계;상기 전기강판에 절연성 접합제를 부분적으로 도포하고 적층하여 철심 적층체를 형성하는 단계; 및상기 철심 적층체에 압력을 가한 상태로 열처리하는 단계를 포함하고,상기 가공하는 단계는, 상기 전기강판의 단부를 비스듬히 절단 또는 절삭하여 경사면을 형성하는 단계를 포함하고,상기 철심 적층체를 형성하는 단계는, 상기 요크를 구성하는 하나의 전기강판을, 상기 요크를 구성하는 다른 전기강판에 스텝 랩 방식으로 적층하고, 상기 레그를 구성하는 하나의 전기강판을, 상기 레그를 구성하는 다른 전기강판에 스텝 랩 방식으로 적층하는 변압기 철심의 제조방법.
- 제5항에 있어서,상기 접합제는 상기 전기강판의 경사면 또는 상기 경사면 주변에 도포되는 변압기 철심의 제조방법.
- 제6항에 있어서,상기 접합제는 0.2 내지 5.0g/mm2 범위의 양으로 도포되는 변압기 철심의 제조방법.
- 제5항에 있어서,상기 전기강판은, 상기 요크의 전기강판 단부와 상기 레그의 전기강판 단부가 접촉하여 겹쳐지는 접촉영역의 길이가, 적어도 상기 경사면이 상기 전기강판의 적층면에 투영된 길이보다 길게 되도록 적층되는 변압기 철심의 제조방법.
- 제5항에 있어서,상기 철심 적층체를 형성하는 단계는, 상기 요크의 형상으로 가공된 전기강판과 상기 레그의 형상으로 가공된 전기강판을 철심의 형상에 맞춰 배열하고 접합 및 적층하는 변압기 철심의 제조방법.
- 제5항에 있어서,상기 철심 적층체를 형성하는 단계는,상기 요크의 형상으로 가공된 전기강판을 적층하여 요크 적층체를 얻는 단계;상기 레그의 형상으로 가공된 전기강판을 적층하여 레그 적층체를 얻는 단계; 및상기 요크 적층체와 상기 레그 적층체를 조립하고 접합하는 단계를 포함하는 변압기 철심의 제조방법.
- 제5항에 있어서,상기 압력은 0.01 ~ 0.8MPa의 범위인 변압기 철심의 제조방법.
- 제5항에 있어서,상기 열처리는, 상기 철심 적층체의 온도가 70 ~ 180℃ 범위 내에 있도록 하여 최소 20분 이상을 유지하는 변압기 철심의 제조방법.
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JPH06151218A (ja) * | 1992-10-30 | 1994-05-31 | Takaoka Electric Mfg Co Ltd | 巻鉄心の製造方法 |
KR100284516B1 (ko) * | 1992-06-26 | 2001-04-02 | 제이 엘. 차스킨, 버나드 스나이더, 아더 엠. 킹 | 코어 윈도우를 감싸는 비결정질 강띠의 그룹을 포함하는 변압기 코어 및 그 제조방법 |
JP2008211002A (ja) * | 2007-02-27 | 2008-09-11 | Kyuhen Co Ltd | 変圧器の製造方法及びこの方法で用いる治具 |
KR20130076930A (ko) * | 2011-12-29 | 2013-07-09 | 주식회사 효성 | 변압기의 철심 |
KR102109279B1 (ko) | 2018-11-08 | 2020-05-11 | 주식회사 포스코 | 무부하손실이 우수한 변압기용 적철심 제조방법 |
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KR100284516B1 (ko) * | 1992-06-26 | 2001-04-02 | 제이 엘. 차스킨, 버나드 스나이더, 아더 엠. 킹 | 코어 윈도우를 감싸는 비결정질 강띠의 그룹을 포함하는 변압기 코어 및 그 제조방법 |
JPH06151218A (ja) * | 1992-10-30 | 1994-05-31 | Takaoka Electric Mfg Co Ltd | 巻鉄心の製造方法 |
JP2008211002A (ja) * | 2007-02-27 | 2008-09-11 | Kyuhen Co Ltd | 変圧器の製造方法及びこの方法で用いる治具 |
KR20130076930A (ko) * | 2011-12-29 | 2013-07-09 | 주식회사 효성 | 변압기의 철심 |
KR101302830B1 (ko) | 2011-12-29 | 2013-09-02 | 주식회사 효성 | 변압기의 철심 |
KR102109279B1 (ko) | 2018-11-08 | 2020-05-11 | 주식회사 포스코 | 무부하손실이 우수한 변압기용 적철심 제조방법 |
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