EP2206126A1 - Transformatorkern mit streufeldschirmung - Google Patents
Transformatorkern mit streufeldschirmungInfo
- Publication number
- EP2206126A1 EP2206126A1 EP07821945A EP07821945A EP2206126A1 EP 2206126 A1 EP2206126 A1 EP 2206126A1 EP 07821945 A EP07821945 A EP 07821945A EP 07821945 A EP07821945 A EP 07821945A EP 2206126 A1 EP2206126 A1 EP 2206126A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- core
- laminated
- stray field
- transformer core
- laminated core
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000004804 winding Methods 0.000 claims abstract description 18
- 238000003475 lamination Methods 0.000 claims description 27
- 239000000853 adhesive Substances 0.000 claims description 25
- 230000001070 adhesive effect Effects 0.000 claims description 25
- 239000002184 metal Substances 0.000 claims description 13
- 229910052751 metal Inorganic materials 0.000 claims description 13
- 241000446313 Lamella Species 0.000 claims description 7
- 230000002093 peripheral effect Effects 0.000 claims description 5
- 239000000696 magnetic material Substances 0.000 claims description 4
- 239000004830 Super Glue Substances 0.000 claims 1
- FGBJXOREULPLGL-UHFFFAOYSA-N ethyl cyanoacrylate Chemical compound CCOC(=O)C(=C)C#N FGBJXOREULPLGL-UHFFFAOYSA-N 0.000 claims 1
- 239000011162 core material Substances 0.000 description 96
- 210000002414 leg Anatomy 0.000 description 31
- 230000004907 flux Effects 0.000 description 20
- 238000004519 manufacturing process Methods 0.000 description 19
- 230000008901 benefit Effects 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 229920001651 Cyanoacrylate Polymers 0.000 description 2
- MWCLLHOVUTZFKS-UHFFFAOYSA-N Methyl cyanoacrylate Chemical compound COC(=O)C(=C)C#N MWCLLHOVUTZFKS-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 150000002148 esters Chemical class 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000005304 joining Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000004381 surface treatment Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000007743 anodising Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 238000009996 mechanical pre-treatment Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000013517 stratification Methods 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
- 238000012549 training Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 210000000689 upper leg Anatomy 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
- H01F27/36—Electric or magnetic shields or screens
-
- 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
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
- H01F27/36—Electric or magnetic shields or screens
- H01F27/366—Electric or magnetic shields or screens made of ferromagnetic material
-
- 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
- H01F27/26—Fastening parts of the core together; Fastening or mounting the core on casing or support
- H01F27/263—Fastening parts of the core together
Definitions
- the invention relates to a transformer core with a stray shield having at least one winding assembly bearing core core formed from a laminated core, wherein the laminated core is closed by Endlamellen, each Endlamelle is associated with a stray field screen having laminated laminations whose layer planes perpendicular to the layer planes of Laminations of the core leg are arranged.
- machine parts such as e.g. the rotor of an electric motor, the core leg of a transformer or a choke laminated ge run.
- eddy current losses induced by the temporal change of a magnetic flux can be kept low.
- stray flux which also causes eddy current losses in the core, although this is always much smaller than the main flow, which is performed in the machine parts.
- a magnetic shield In order to reduce the magnetic power loss of a transformer or a choke, a magnetic shield is already known from DE 1 237 677, which shields the stray flux from the core of a transformer or a throttle.
- This magnetic shield consists of laminations, which are layered into a laminated core. The sizing levels of the magnetic shield laminations are perpendicular to the finishing planes of the core leg laminations.
- Magnetic shield is firmly clamped by means of clamping wedges or clamping strips between the core leg and the surrounding winding with the interposition of a solid support plate holding magnetic shield laminations.
- the magnetic shield and the mounting take up an installation space in the winding window, so that the electrical winding, which encloses the core leg, must be dimensioned larger.
- the invention is based on the object to provide a transformer core, in which the formation of eddy currents, which are caused by leakage flux, is kept as low as possible in the simplest possible way.
- the invention is based on the basic idea of forming a core made of a laminated core transformer core, the outer core stage as a stray field shield, so that the
- the stray field patch screen is arranged such that the layer planes are perpendicular to the layer planes of the core leg Belchperss and that the lamination end faces of the stray field shield directly on an outer broad surface of an associated Endlamelle.
- the stray field shield can be fixed in different ways, for example by frictional engagement or by material closure.
- the outer stage of the core fulfills a dual function: on the one hand it absorbs the leakage flux entering from the air space, on the other hand it also carries a part of the main flow. Since the leakage flux enters the front side of the screen device, the formation of eddy currents is severely limited by the correspondingly thin sheets. The magnetic losses decrease. The training so-called "hot spots" is lower. In an oil transformer, the oil heats less, which improves the technical reliability.
- the arrangement of the stray field shield according to the invention allows a compact structure, since the lamination end surfaces of the stray field shield directly to a
- the determination of the stray field-laminated core can also be done by a metal adhesive bond with advantage.
- a metal adhesive bond with advantage.
- a very special advantage can be achieved by the laminated core of the stray field screen is made of the same soft magnetic material as the laminated core of the core leg. As a result, residual material that accumulates in the production of a transformer type can be profitably used for the production of the stray field screen. This further reduces the laminated core of the stray field screen.
- the laminated core of the core leg is made of partial laminated cores in such a way that seen in cross section the peripheral contour has steps in a first region of the laminated core (FIG. 3), while in another region it is a circular arc which concentrically surrounds it Core thigh axis runs.
- the volume of the cylinder portion is used efficiently for the shielding of the leakage flux.
- the stray field does not require any additional construction volume and consequently there is no additional requirement for conductor material for the production of the electrical winding.
- a further amount for cost reduction can be achieved by the adhesive is applied only part of the area on the wide surfaces of the laminations of the litter field.
- the laminations facing the leg axis lamination end face are arranged flush in a plane. It has proven useful if the joining surfaces of the metal adhesive bond are pretreated by mechanical or by chemical surface treatment methods.
- a particularly high strength of the metal adhesive bond can be achieved if the lamination end faces have a low mechanical roughness, e.g. are ground.
- Figure 1 shows a transformer according to the invention in a three-dimensional sketch with a shroud packet along the core leg;
- FIG. 2 is a cross-sectional view of a first embodiment of the core leg of Figure 1;
- FIG. 3 is a cross-sectional view of a second embodiment with a core leg assembled in stages from partial laminated cores
- Figure 1 shows a simplified representation of a known Drekelkeltransformator whose core 1 is laminated.
- Core 1 consists essentially of the three core legs 2 ', 2' ', 2' '', the lower yoke 5 and the upper yoke 6.
- Each of the legs 2 ', 2' ', 2' '' carries a winding assembly 13, which is indicated in Figure 1 by a broken line drawing.
- each of the legs 2 ', 2' ', 2' '' is composed of one (core leg) laminated core 3 and of two additional laminated cores 4 'and 4' '.
- the laminated cores 4 ', 4' ' act as stray field screen.
- the laminated core 3 is terminated by end blades 7 ', 7 ".
- the front plate core 4 'lying in Figure 1 is applied to a front end plate 7' of the laminated core 3; the backward one
- Sheet metal package 4 '' is applied to a rear end plate 1 '' of the laminated core 3.
- the laminated core 3 is dimensioned to guide the main flow of the transformer.
- the two additional laminated cores 4 'and 4'' form a stray field shield, ie they serve to shield the magnetic flux leakage: They conduct the leakage flux entering from the air space in the region of the leg 2', 2 '', 2 ''', so that this is not flat in one Endlamelle 7 'and 7''(see Figure 2) enter and there may cause eddy currents as a result of induction.
- FIG. 2 shows a cross-sectional view of the
- connection 16 is effected by a metal adhesive bond, ie by StoffSchluss, i. by atomic or molecular forces.
- connection 16 can also be designed differently, for example as a (spot) welding or soldering connection, but it can also be produced by a pressure device, not shown in the drawing, by frictional engagement.
- the laminations 40 ', 40' 'of the stray field shield 4' and 4 '' are also held together by an adhesive.
- Suitable adhesives are in particular one-component products based on cyanoacrylate acid esters, which Cure humidity. Particularly suitable is an adhesive viscosity of a few hundred mPas, in particular 500-700 mPas, measured at 25 degrees Celsius. These adhesives can be easily applied by automated manufacturing tools in the manufacture of the transformer core. In practice, a pretreatment of the joining surfaces has proven to be particularly advantageous. A mechanical pretreatment, in particular a grinding of the lamination end faces 9 ', 9 "(FIG. 2) of the laminated core 4', 4", considerably increases the strength of the adhesive bond. It is also favorable if the wide surface 8 ', 8' (FIG. 2) of an end plate 7 ', 1 "is treated, for example, by chemical surface treatment methods. This can be done, for example, by anodizing this contact surface 8 ', 8 "and / or the lamination end faces 9', 9".
- an end plate 7 'or 1 in each case closes the laminated core 3 at the top or bottom.
- the layer planes 14 of this laminated core body 3 extend in a straightforward manner in FIG. 2 and are substantially perpendicular to the layer planes 15 of the front laminated core 4 or of the rear laminated core 4 ''.
- the two laminated cores 4 'and 4' ' act with respect to the on the entrance surface of the end plate 7' and 1 '' stray flux as a "magnetic shield": they take the
- FIG. 2 shows an example of a single field line 11 of the leakage flux.
- the "magnetic shield” is located directly on the laminated core 3 and forms an integral part of the core leg.
- the core sheets are made from a sheet metal strip of a high-permeability soft magnetic material. A typical sheet thickness is between 0.23 mm and 0.35 mm
- the cutting of the individual sheets is done by punching or cutting. It remains obese in the metal sheet always residual material. This remainder material can be favorably used for the production of the stray shield (i.e., for the manufacture of laminations 4 ', 4' ') by first winding up the web-like stock material, then pressing it and finally cutting it to shape in the stack.
- the lamella thickness D3 of the laminated core 3 is the same size with the lamella thickness D4 of the stray field shield 4 ', 4' '.
- the laminated core 3 and the stray field shield 4 ', 4' ' are made of the same soft magnetic material.
- Kernschenkels is circular.
- the laminated core 3 is here composed of partial laminated cores 3 ', 3'',3'', etc., and combined with the shroud packages 4 'and 4''to a leg-laminated core.
- the peripheral contour of the laminated core 3 extends in the region of the partial laminated cores 3 ', 3'',3''' in stages (see steps 18 in the area 17).
- the stratification levels in the laminated core 3 and the stray field screen 4' regarding. 4 '' are also perpendicular to each other in Figure 3.
- Each laminated core 4 'and 4''according to the invention is in each case with the end faces 9' and 9 '' of the fins 40'êt. 40 '' on an outer wide surface 8 'and 8''to.
- the leakage flux 11 entering from the air space is largely absorbed by the "magnetic shield" 4 ', 4 "and to be guided by it in the axial direction 12 of a core leg 2', 2", 2 '''without appreciable Eddy currents and thus a corresponding heating in the laminated core 3 is caused.
- the advantage of the construction according to the invention is in particular that the stray field shield 4 'or 4' 'is an integral part of the core of the transformer 1.
- the adhesive connection eliminates the known in the prior art, usually solid
- the stray field shield 4 ', 4''at the junction to the lower yoke 4 and the upper yoke 5 connects seamlessly.
- the stray field screen 4 ', 4'' also performs a part of the main flow, that is, it performs a dual function, namely the leadership of the main flow and the shielding of the leakage flux.
- a further advantage of the present invention is the fact that the emission of operating noise due to the elastic material closure of the adhesive bonds is lower.
- FIG. 3 shows a further advantage of the illustrated exemplary embodiment: if the extent of the individual lamellae 40 'seen in the radial direction,
- the predetermined by the cylinder portion 10 volume in the winding window can be used very efficiently for guiding the magnetic flux.
- the width of the individual laminations 40 'and 40' 'of a stray field shield laminated core 4' or 4 '' but also be the same size or be stepped (not shown in Figure 3).
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Regulation Of General Use Transformers (AREA)
- Coils Or Transformers For Communication (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Description
Claims
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP2007/061585 WO2009056162A1 (de) | 2007-10-29 | 2007-10-29 | Transformatorkern mit streufeldschirmung |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2206126A1 true EP2206126A1 (de) | 2010-07-14 |
EP2206126B1 EP2206126B1 (de) | 2012-03-14 |
Family
ID=39495518
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07821945A Active EP2206126B1 (de) | 2007-10-29 | 2007-10-29 | Transformatorkern mit streufeldschirmung |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP2206126B1 (de) |
CN (1) | CN101933106A (de) |
AT (1) | ATE549725T1 (de) |
ES (1) | ES2382054T3 (de) |
WO (1) | WO2009056162A1 (de) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102648505B (zh) * | 2009-11-20 | 2015-07-29 | 三菱电机株式会社 | 变压器 |
US9640315B2 (en) | 2013-05-13 | 2017-05-02 | General Electric Company | Low stray-loss transformers and methods of assembling the same |
CN103680856B (zh) * | 2013-12-25 | 2016-09-28 | 深圳银利电器制造有限公司 | 心柱与铁轭硅钢片切口垂直式电感器铁芯 |
EP3244511A1 (de) * | 2016-05-09 | 2017-11-15 | Siemens Aktiengesellschaft | Rotorballen und verfahren zum herstellen eines rotorballens |
BR112020021630B8 (pt) * | 2018-04-23 | 2023-04-25 | Hainan Jinpan Smart Tech Co | Núcleo de transformador, transformador e método de montagem de um núcleo de transformador |
CN117095915A (zh) * | 2023-06-26 | 2023-11-21 | 西安西电变压器有限责任公司 | 铁心、铁心结构及变压器 |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB218918A (en) | 1923-09-18 | 1924-07-17 | Gen Electric | Improvements in and relating to electric transformers |
DE1237677B (de) | 1964-08-01 | 1967-03-30 | Siemens Ag | Magnetschildanordnung fuer geschichtete Eisenkerne von Transformatoren und Drosselspulen |
US3464041A (en) * | 1968-03-06 | 1969-08-26 | Allis Chalmers Mfg Co | Electrical transformer having leakage flux shield |
US3614695A (en) | 1970-09-24 | 1971-10-19 | Westinghouse Canada Ltd | Inductive apparatus with magnetic locking plates |
US6873239B2 (en) * | 2002-11-01 | 2005-03-29 | Metglas Inc. | Bulk laminated amorphous metal inductive device |
AT413158B (de) | 2003-12-09 | 2005-11-15 | Va Tech Ebg Transformatoren Gm | Elektrische maschine mit einer abschirmeinrichtung gegen magnetischen streufluss |
DE102005008302B4 (de) | 2005-02-16 | 2010-09-02 | Siemens Ag | Transformatorkern mit magnetischer Abschirmung |
-
2007
- 2007-10-29 CN CN2007801013365A patent/CN101933106A/zh active Pending
- 2007-10-29 ES ES07821945T patent/ES2382054T3/es active Active
- 2007-10-29 WO PCT/EP2007/061585 patent/WO2009056162A1/de active Application Filing
- 2007-10-29 EP EP07821945A patent/EP2206126B1/de active Active
- 2007-10-29 AT AT07821945T patent/ATE549725T1/de active
Non-Patent Citations (1)
Title |
---|
See references of WO2009056162A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2009056162A1 (de) | 2009-05-07 |
CN101933106A (zh) | 2010-12-29 |
ATE549725T1 (de) | 2012-03-15 |
EP2206126B1 (de) | 2012-03-14 |
ES2382054T3 (es) | 2012-06-04 |
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