EP0010427A1 - Transformatorkerne - Google Patents

Transformatorkerne Download PDF

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Publication number
EP0010427A1
EP0010427A1 EP19790302237 EP79302237A EP0010427A1 EP 0010427 A1 EP0010427 A1 EP 0010427A1 EP 19790302237 EP19790302237 EP 19790302237 EP 79302237 A EP79302237 A EP 79302237A EP 0010427 A1 EP0010427 A1 EP 0010427A1
Authority
EP
European Patent Office
Prior art keywords
core
width
section
strip
cutting
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
Application number
EP19790302237
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English (en)
French (fr)
Other versions
EP0010427B1 (de
Inventor
Laurence Rex Manderson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Manderson Susan Valerie
Original Assignee
Manderson Susan Valerie
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Manderson Susan Valerie filed Critical Manderson Susan Valerie
Publication of EP0010427A1 publication Critical patent/EP0010427A1/de
Application granted granted Critical
Publication of EP0010427B1 publication Critical patent/EP0010427B1/de
Expired legal-status Critical Current

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    • 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
    • H01F41/0213—Manufacturing of magnetic circuits made from strip(s) or ribbon(s)
    • 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
    • H01F27/25—Magnetic cores made from strips or ribbons

Definitions

  • This invention relates to transformer cores of the wound core type and is suitable for either single phase or three phase trans formers.
  • the object of the present invention is to improve upon these existing cores.
  • a preferred feature of the present invention is the use of tapered electrical steel strip to produce a hexagonal or better approximation to circular cross-section for those portions of the core under the windings to enable the production of cores of near optimum geometry as a straight forward proandure
  • the present invention aosides in a method of manufacturing a transformer core from electrical steel strip including the step of:
  • the portion of the strip is cut with an approximately linear taper.
  • the present invention resides in a transformer constructed using the method.
  • the invention in its preferred simplest form, is the hexagonal form approximation, which can be achieved in either of two ways, both using a single width size of conventionally slit steel strip, which is then specially slit.
  • two identical cores can be slit from the normal parallel sided strip in such a manner that the tapered pieces are complementary to each others
  • Two identical tapered strips can readily be cut from a suitable rectangular piece by cutting it at an appropriate angle.
  • the production of the tapered electrical steel strip is implemented by a suitable slitting machine. Bocause the angle of taper is so small e.g. less than 1°, the axis of the slitting rollers is set perpendicular to the Strip of el ectrical steel, and the necessary taper is achieved by Forcing the rollers across the sheet.
  • the need for precise control of the positioning of the slitting rollers meaus that the s] itting machine is best built with a single pair of rollers for the slitting operation. This means that it only has to accomodate the width of steel needed for the Largest core to be cut by the method. The details of the method are most easily illustrated by a description of the relevant parts of the machine.
  • the strip is passed through a pair of plain rollers, comprising a driven roller to control the speed of the strip, and its idler.
  • the strip then passes through two guides with tungsten carbide wear parts which control its lateral position, and then through a second pair of rollers similar to the first.
  • the second idler is identical to the first, hut the other roller is machined to have a circumference which matches the number of pulses per revolution of the pulse generator (shaft encoder) that it drives.
  • This unit thus measures the length along the strip as it is fed through, and the slitting roller assembly is immediately adjacent to it.
  • the slitting rollers are mounted on a very rigid frame, and can be set so that they are preloaded to minimize deflection and with the desired amount of overlap.
  • the roller frame is wider than the strip, since it must be able to mere back and forth across the strip.
  • the frame is mounted on a machine bed and driven by a worm drive from a direct current motor geared down by a large amount because of the slow travel required.
  • a second shaft encoder with its own small roller which enables the position of the slitting rollers to be known and controlled.
  • the conteol system for the slitting roller assembly is straightforward in that the motion of the slitting rollers sideways across the strip is direc ly proportional to the length of strip passing through. This can be implemented by ordinary iogie and servosystem components, but is better and simpler done by a microprocessor based computer which may control the rest of the machine.
  • the tapered strip required for the core designs can readily be produced.
  • the core 10 which is continuously wound has a substantially hexagonal cross-section as shown in FIG. 1A comprising a section 10A of increasing width, a central section 10B of maximum width, and a section 10C of decreasing width.
  • section 10A is wound from strip 11A which is cut from a rectangular stock strip 12, the strip 10A having a linear taper from a substantially zero width upto the width of the stock-strip 12.
  • Section 10B is wound from a strip 11B cut from a length of the stock strip 12 and has parallel sides.
  • Section 10C is wound from a strip 110 out from stock strip 12 and has a linear taper from the width of the stock strip 12 down to substantially zero width. As the strip 11A, 11C are of the same width, they can be cut from lengths of stock strip 12.
  • the core 20 has a section 20A of increasing width and a section 20B of decreasing width.
  • the seetions both have a maximum width equal to the maximum width of the core and a minimun. width equal to one-half of the core, the sections 20A, 20B being wound from strips 21A, 21B respectively from rectangular stock strip 22 which has a width equal to 1.5 times the maximum width of the core 20.
  • the strips 21A, 20B are complementary, two transformer cores 20 can be cut from a single length of stock strip 22 without scrap.
  • the single phase shell-type core 30 of FIGS. 3 and 3A has a pair of core frames 31A each with a cross-section which is substantially identical with an isosceles trapezium.
  • each frame can be wound from a single strip of increasing width, such as strips 21A, 21B shown ifi-FIG. 2A. As these strips are complementary, the core 30 can be produced from a single piece of rectangular stock strip i.e. strip 22.
  • the three-phase delta core 40 shown in FIGS. 4 and 4A compaises three froames 41 each conjoined at their sides the other two frames, the legs of the core having a substantially hexagonal cross-section.
  • Each frame 41 is continuously wound from a section 42 of fixed width ( equal to 0°5 times the diameter of the leg) cut from a length of rectanfuiar stock strip of that width, and then a section 43 of decreasing width.
  • the sections 43 of two of the frames can be complementary, they can be cut from rectangular stock strip having a width equal to 0.5 times the diameter of the core legs.
  • the core 40 is assembled by placing the frames 41 in the configuration shown in FIGS. 4 and 4A and securing the frames together.
  • FIGS. 5, 5A and 5B show a three-phase "star” or "Y" core 50 with legs of substantially hexagonal cross-section.
  • the core 50 comprises three frames 51A, 51B, 51C each of substantially C-shape in side view.
  • Each frame 51A, 51B, 51C is formed from a series of lamination lengths A,B,C respectively cut from a tapered strip 53.
  • the strip 53 is of increasing taper to form section 52A of each frame and of decreasing taper to form section 52B and may be cut as shown in FIG. 2A.
  • Lamination lengths A.B.C are cut to selected length of square-ended strip 53 with two cuts at 60° to the longitudinal axis of the strip 53. This cutting step for most size cores can ignore the taper on the layers which come from the taper, strip because of the small angle of taper.
  • Each layer is formed as shown in FIG. 5A where the angled cut ends of each lamination length are butted to the side of adjacent strip adjacent its free ends.
  • the method of assembling a star core is to lay together all the laminations so that one joint (e.g, the bottom joint) is assembled and the core has the appearance of three radial arms.
  • the joint is clamped and the lamination lengths A,B, C are bent upward until they are perpendicular to the plane of the joint.
  • the lengths are secured and then the top joint is sequentially folded together.
  • the electromagnetic properties of the joint are best when each layer is rotated one third of a turn from the previous layer, that is when piece A of FIG. 5A is placed on each core leg in turn.
  • This joint is applicable not only to cores with tapered strip, but to any core of this type, also known as Y (wye) cores.
  • the section labelled E can be seen to protrude from the joint, but there is no advantage to be gained by removing it.
  • the transformer designer can achieve great flexibility in desuign.
  • careful selection of the taper of the electrical strip he can achieve almost any core cross-section which he may require and can almost achieve the theoretically optimum circular cross-section.
  • the hexagonal cross-section as an approximation of the circular rrosssection is readily achievable.
  • the invention in addition to its application as a means of produc ing the hexagonal form approximation, can in a analogous fashon to the cruciform case, be used to produce octagonal of higher order even regular sided approximations to a circular cross-soction. However, for each pair of sides in excess of six an additional size of parallel strip is required to allow scrapless production of the core.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)
EP19790302237 1978-10-19 1979-10-17 Transformatorkerne Expired EP0010427B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPD647278 1978-10-19
AU6472/78 1978-10-19

Publications (2)

Publication Number Publication Date
EP0010427A1 true EP0010427A1 (de) 1980-04-30
EP0010427B1 EP0010427B1 (de) 1986-01-15

Family

ID=3767791

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19790302237 Expired EP0010427B1 (de) 1978-10-19 1979-10-17 Transformatorkerne

Country Status (6)

Country Link
EP (1) EP0010427B1 (de)
JP (1) JPS5556615A (de)
CA (1) CA1169932A (de)
DE (1) DE2967567D1 (de)
IN (1) IN152275B (de)
NZ (1) NZ191840A (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19629930A1 (de) * 1996-07-24 1998-02-05 Siemens Ag Kern eines Transformators mit geschichteten Blechen sowie eine Vorrichtung und ein Verfahren zur Herstellung der Bleche
EP1148522A3 (de) * 2000-04-17 2001-12-12 Nkk Corporation Rauscharmer Reaktor mit niedigrem Verlust
US6407655B1 (en) 1994-03-16 2002-06-18 Kitamura Kiden Co., Ltd. Wound core for toroidal transformer
CN104221105A (zh) * 2012-01-17 2014-12-17 U.T.T.独特变压器科技股份有限公司 用于磁感应装置的三相磁芯及其制造方法
FR3112648A1 (fr) * 2020-07-20 2022-01-21 Safran Electrical & Power Procédé de fabrication de boucles pour circuit magnétique

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW527745B (en) 2000-11-21 2003-04-11 Dainichiseika Color Chem Solidifying material for cell electrolyte solution, and cell comprising the solidifying material
MY177569A (en) * 2011-05-27 2020-09-21 Guangdong Haihong Co Ltd Amorphous alloy stereo wound-core

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE691531C (de) * 1937-07-02 1940-05-29 Aeg Mehrphasenmanteltransformator
GB524285A (en) * 1938-01-25 1940-08-02 British Thomson Houston Co Ltd Improvements in and relating to magnetic cores for transformers and like magnetic induction apparatus
US2366071A (en) * 1939-05-25 1944-12-26 Gen Electric Stationary induction apparatus
US2458112A (en) * 1947-01-20 1949-01-04 Line Material Co Three-phase transformer construction
GB662915A (en) * 1948-11-26 1951-12-12 Westinghouse Electric Int Co Improvements in or relating to three-phase core structures for electrical induction apparatus
GB692845A (en) * 1950-10-21 1953-06-17 Asea Ab Method for producing wound magnetic cores having approximately circular cross-section
GB708995A (en) * 1951-05-08 1954-05-12 British Thomson Houston Co Ltd Improvements in and relating to magnetic cores
FR1107583A (fr) * 1954-06-18 1956-01-03 Cem Comp Electro Mec Procédé de fabrication de circuits magnétiques à tôles enroulées
DE1011056B (de) * 1953-07-08 1957-06-27 Licentia Gmbh Aus drei Rahmenkernen zusammengesetzter Dreischenkelkern der Tempeltype
GB830094A (en) * 1956-12-18 1960-03-09 Bbc Brown Boveri & Cie Yoke for a magnetic circuit and method of producing same
FR1333285A (fr) * 1962-09-04 1963-07-26 A R L Etablissements Augier So Nouveau mode de fabrication des noyaux magnétiques et enroulements de transformateurs
FR2287760A1 (fr) * 1974-10-07 1976-05-07 Ingenieria Electrica Ind Sa Circuit magnetique pour transformateurs electriques triphases
DE2702455A1 (de) * 1977-01-21 1978-07-27 Andreev Raeumlicher dreiphasenmagnetleiter

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE691531C (de) * 1937-07-02 1940-05-29 Aeg Mehrphasenmanteltransformator
GB524285A (en) * 1938-01-25 1940-08-02 British Thomson Houston Co Ltd Improvements in and relating to magnetic cores for transformers and like magnetic induction apparatus
US2366071A (en) * 1939-05-25 1944-12-26 Gen Electric Stationary induction apparatus
US2458112A (en) * 1947-01-20 1949-01-04 Line Material Co Three-phase transformer construction
GB662915A (en) * 1948-11-26 1951-12-12 Westinghouse Electric Int Co Improvements in or relating to three-phase core structures for electrical induction apparatus
GB692845A (en) * 1950-10-21 1953-06-17 Asea Ab Method for producing wound magnetic cores having approximately circular cross-section
GB708995A (en) * 1951-05-08 1954-05-12 British Thomson Houston Co Ltd Improvements in and relating to magnetic cores
DE1011056B (de) * 1953-07-08 1957-06-27 Licentia Gmbh Aus drei Rahmenkernen zusammengesetzter Dreischenkelkern der Tempeltype
FR1107583A (fr) * 1954-06-18 1956-01-03 Cem Comp Electro Mec Procédé de fabrication de circuits magnétiques à tôles enroulées
GB830094A (en) * 1956-12-18 1960-03-09 Bbc Brown Boveri & Cie Yoke for a magnetic circuit and method of producing same
FR1333285A (fr) * 1962-09-04 1963-07-26 A R L Etablissements Augier So Nouveau mode de fabrication des noyaux magnétiques et enroulements de transformateurs
FR2287760A1 (fr) * 1974-10-07 1976-05-07 Ingenieria Electrica Ind Sa Circuit magnetique pour transformateurs electriques triphases
DE2702455A1 (de) * 1977-01-21 1978-07-27 Andreev Raeumlicher dreiphasenmagnetleiter

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6407655B1 (en) 1994-03-16 2002-06-18 Kitamura Kiden Co., Ltd. Wound core for toroidal transformer
DE19629930A1 (de) * 1996-07-24 1998-02-05 Siemens Ag Kern eines Transformators mit geschichteten Blechen sowie eine Vorrichtung und ein Verfahren zur Herstellung der Bleche
EP1148522A3 (de) * 2000-04-17 2001-12-12 Nkk Corporation Rauscharmer Reaktor mit niedigrem Verlust
US6531946B2 (en) 2000-04-17 2003-03-11 Nkk Corporation Low noise and low loss reactor
CN104221105A (zh) * 2012-01-17 2014-12-17 U.T.T.独特变压器科技股份有限公司 用于磁感应装置的三相磁芯及其制造方法
CN104221105B (zh) * 2012-01-17 2017-08-25 U.T.T.独特变压器科技股份有限公司 用于磁感应装置的三相磁芯及其制造方法
FR3112648A1 (fr) * 2020-07-20 2022-01-21 Safran Electrical & Power Procédé de fabrication de boucles pour circuit magnétique
WO2022018344A1 (fr) * 2020-07-20 2022-01-27 Safran Electrical & Power Procédé de fabrication de boucles pour circuit magnétique

Also Published As

Publication number Publication date
EP0010427B1 (de) 1986-01-15
DE2967567D1 (de) 1986-02-27
IN152275B (de) 1983-12-10
JPS5556615A (en) 1980-04-25
NZ191840A (en) 1983-06-14
JPS6227527B2 (de) 1987-06-15
CA1169932A (en) 1984-06-26

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