EP0010427B1 - Transformer cores - Google Patents

Transformer cores Download PDF

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Publication number
EP0010427B1
EP0010427B1 EP19790302237 EP79302237A EP0010427B1 EP 0010427 B1 EP0010427 B1 EP 0010427B1 EP 19790302237 EP19790302237 EP 19790302237 EP 79302237 A EP79302237 A EP 79302237A EP 0010427 B1 EP0010427 B1 EP 0010427B1
Authority
EP
European Patent Office
Prior art keywords
cut
core
lamination
strip
layer
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.)
Expired
Application number
EP19790302237
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0010427A1 (en
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/en
Application granted granted Critical
Publication of EP0010427B1 publication Critical patent/EP0010427B1/en
Expired legal-status Critical Current

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Classifications

    • 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 star or Y configuration and a method of manufacturing the same.
  • US-A-2366071 and GB-A-662915 disclose the fabrication of transformer cores by means of steel strip laminations of varying width so as to produce cores having stepped cross-sections (see for example Figure 18 of GB-A-662915).
  • US-A-2366071 discloses the production of core constructions by forming tapered strip and winding it spirally into a series of constructions.
  • GB-A-662915 is concerned with building up the core from a large number of separate parallel- sided strip lengths of different widths.
  • the object of the present invention is to improve upon these existing core constructions and methods of making the same.
  • the present invention seeks to provide a hexagonal or higher order approximation to circular cross-section for cores of star or Y configuration so as to enable the production of cores of near optimum geometry as a straightforward procedure without a large number of different widths of electrical steel strip being required.
  • a transformer core of star or Y configuration from electrical steel strip whereing said core comprises three frames each of substantially C-shape in side view, the frames being arranged at substantially 120° apart and fabricated from a plurality of substantially C-shaped steel.strip lengths which vary in width and are laminated together so that the frame has a stepped cross-section, said method being characterised by the steps of:
  • a transformer core of Y or star configuration comprising three frames, each frame being substantially C-shaped in side view, the frames being arranged substantially 120° apart and each comprising a plurality of layers each comprising a C-shaped strip, the strips of each frame varying in width so that the frame has a stepped cross-section, characterised in that:
  • the production of the tapered electrical steel strip is implemented by a suitable slitting machine. Because 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 electrical 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 means that the slitting machine is best built with a single pair of rollers for the slitting operation. This means that it only has to accommodate 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, but 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 move 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 control system for the slitting roller assembly is straightforward in that the motion of the slitting rollers sideways across the strip is directly proportional to the length of strip passing through. This can be implemented by ordinary logic 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.
  • Figures 1, 1A and 1C 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 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 (see Figure 1B).
  • the strip 53 is of increasing taper to form section 52A of each frame and of decreasing taper to form section 52B.
  • Lamination lengths A, B, C are cut to selected length of square-ended strip 53 with two cuts 53A and 53B 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 tapered strip because of the small angle of taper.
  • Each layer is formed as shown in Figure 1A 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 shown in Figure 1) 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 Figure 1 is placed on each core leg in turn.
  • This joint is the only straight cut, scrapless, butt interleaved (lapped) star or Y core joint and is applicable not only to cores with tapered strip, but to any core of this type.
  • a generally wedge shaped end section labeled E in Figure 1 can be seen to protrude from the joint.
  • the ends E are labeled in accordance with the layer with which they are associated.
  • E1 is the end section of the joint in the first layer
  • E2 is the end section of the joint in the second layer
  • E3 is the end section of the joint in the third layer. It is apparent that end section E1 protrudes from the first joint. After this end section, every third lamination layer has an end section which protrudes in the same direction.
  • These end sections are labeled E4, E7, E10 and E13, respectively.
  • Each of these end sections is larger than the previous end section, with E1 being the smallest and E13 being the largest.
  • Figure 1C shows that the end sections increase in size in accordance with the width of the lamination.
  • the first lamination is shown in solid lines and forms end section E1.
  • the second lamination forms end section E2 which is rotated by 120° from E1.
  • the third lamination forms end section E3 which is rotated by 60° from end section E2.
  • the fourth lamination is shown in dotted lines where it extends beneath the prior lamination and forms end section E4.
  • end section E4 In order for end section E4 to accommodate the greater width of the laminations of the fourth layer, it must extend further than end section E1.
  • the end sections discussed are associated with sections 52A of each frame. These end sections increase in width from end section E1 to end Section E13.
  • the end sections associated with frame sections 52B decrease in width similarly. Accordingly, the resultant end section profile formed between frames 51A, 51 B and 51C is somewhat triangular in configuration.
  • the transformer designer can achieve great flexibility in design.
  • careful selection of the taper of the electrical strip he can achieve almost any 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 cross-section is readily achievable.
  • the invention in addition to its application as a means of producing the hexagonal form approximation can be used to produce octagonal or higher order even regular sided approximations to a circular cross-section. 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 Transformer cores Expired EP0010427B1 (en)

Applications Claiming Priority (2)

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

Publications (2)

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

Family

ID=3767791

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19790302237 Expired EP0010427B1 (en) 1978-10-19 1979-10-17 Transformer cores

Country Status (6)

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

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2771109B2 (ja) 1994-03-16 1998-07-02 北村機電株式会社 巻鉄心
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
JP3794928B2 (ja) 2000-04-17 2006-07-12 東京精電株式会社 低騒音・低損失リアクトル
TW527745B (en) 2000-11-21 2003-04-11 Dainichiseika Color Chem Solidifying material for cell electrolyte solution, and cell comprising the solidifying material
CN102314997A (zh) * 2011-05-27 2012-01-11 广东海鸿变压器有限公司 非晶合金立体卷铁心
IL217576A0 (en) * 2012-01-17 2012-03-29 Eliezer Adar Three phase transformer and method for manufacturing same
FR3112648B1 (fr) * 2020-07-20 2023-04-14 Safran Electrical & Power Procédé de fabrication de boucles pour circuit magnétique

Family Cites Families (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
AR204449A1 (es) * 1974-10-07 1976-02-06 Ingenieria Electrica Ind Sa Circuito magnetico para transformadores electricos trifascos
DE2702455A1 (de) * 1977-01-21 1978-07-27 Andreev Raeumlicher dreiphasenmagnetleiter

Also Published As

Publication number Publication date
EP0010427A1 (en) 1980-04-30
JPS5556615A (en) 1980-04-25
DE2967567D1 (de) 1986-02-27
NZ191840A (en) 1983-06-14
IN152275B (enrdf_load_stackoverflow) 1983-12-10
JPS6227527B2 (enrdf_load_stackoverflow) 1987-06-15
CA1169932A (en) 1984-06-26

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