US3453576A - Laminated magnetic core structures for transformers or choke coils of great power - Google Patents

Laminated magnetic core structures for transformers or choke coils of great power Download PDF

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Publication number
US3453576A
US3453576A US699148A US3453576DA US3453576A US 3453576 A US3453576 A US 3453576A US 699148 A US699148 A US 699148A US 3453576D A US3453576D A US 3453576DA US 3453576 A US3453576 A US 3453576A
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United States
Prior art keywords
yoke
laminations
yoke arms
magnetic core
end edges
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Expired - Lifetime
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US699148A
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English (en)
Inventor
Antonius H Th J Sliepenbeek
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Smit Nijmegen Electrotechnische Fabrieken NV
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Smit Nijmegen Electrotechnische Fabrieken NV
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    • 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
    • H01F27/2455—Magnetic cores made from sheets, e.g. grain-oriented using bent laminations

Definitions

  • the inner ends of the yoke arms are provided with end edges including an angle of 120 and two yoke arms of each layer having unequal length end edges while the remaining one has equal length end edges, each end edge of the yoke arms in each layer being in abutting relation with one other end edge and the yoke arms of successive layers having the equal length end edges being oifset from the common point successively in dilterent directions along the axes of the yoke arms so as to avoid gaps between end edges while obtaining strip-like overlap at the end edges between successive layers.
  • the invention relates to a laminated magnetic core structure for a transformer or a choke coil of great power, comprising three leg members extending with their central longitudinal axes in the longitudinal edges of an equilateral prism, two star-shaped yoke members, each of which consists of three abutting yoke arms enclosing angles of 120 and having central longitudinal axes, which intersect in a common point, and coupling members, each of which connects an end of a leg member with the free end of a yoke arm, and in which core structure in at least a part of the total number of layers of laminations of the yoke members each yoke arm abuts at its end facing the two other yoke arms said other yoke arms with two end edges meeting in an angular point, whereas in each of said layers the common point of junction of said end edges of the yoke arms lies in oflset relation in the direction of the central longitudinal axis of one of the yoke arms with the common point of
  • a magnetic core structure of this construction is disclosed in the French patent specification 1,229,933.
  • the result of this construction is, that the laminations of the yoke arms of consecutive layers overlap each other with substantially triangular areas and the vertexes of said overlapping triangular areas lie at the outer edges of the yoke arms. This is unfavourable to obtain a strong mechanical connection between the yoke arms.
  • the invention has for its object to provide a magnetic core structure having similar yoke members, in which the connection between the yoke arms is considerably stronger. It consists in that in each of the said layers the angles of the yoke arms, which are enclosed by the end edges abutting each other, are all 120. In this case the joints of the yoke arm laminations of the different layers lie in offset relation and are parallel to each other, so that they are overlapped by strip-shaped areas of equal width. Consequently, the overlapping areas have at the outer edges of the yoke arms the same width as near the common point of intersection of said arms, which is favourable for the mechanical connection between the yoke arms.
  • FIG. 1 a view in perspective of a laminated magnetic core structure according to the invention
  • FIGS. 8, 9 and 10 on a larger scale laminations for a yoke member composed of layers shown in FIGS. 2-7, when each of the laminations therefor has been divided along a line parallel to or coinciding with the central longitudinal axis.
  • FIG. 1 of the drawing 1 are three vertical leg members extending with their longitudinal axes in the longitudinal edges of an equilateral prism, 2 are three horizontal yoke arms meeting with their central longitudinal axes in a common point of intersection 3 and enclosing angles of and 4 are circle-cylindrically curved coupling members extending between said leg members and said yoke arms of the magnetic core structure of a trans former or a choke coil of large power.
  • leg members and the coupling members consist, in each layer, of two laminations of equal widths separated from one another by a cooling gap 5, however, the leg members and the coupling members may also consist in each one of the said layers of one single broad lamination.
  • the yoke arms consist, in consecutive layers, either of a longer lamination 6 having two end edges 7, 8, which are equally long and enclose an angle of 120, and two laminations 9 having a longer end edge 10 and a shorter end edge 11, said end edges having unequal lengths but also enclosing an angle of 120 (FIG. '2), or of a shorter lamination 12 having two end edges 7, 8, which are equally long and enclose an angle of 120, and two laminations 9 (FIG. 3).
  • the asymmetrical laminations 9 abut each other with their shorter end edges 11 and abut the end edges 7, 8 of the symmetrical lamination 6 with their longer end edges 10.
  • the laminations 9 abut each other with their longer end edges 10 and they abut the end edges 7, 8 of the symmetrical lamination 12 with their shorter end edges 11.
  • the layers shown in FIGS. 4 and 6 correspond with that shown in FIG. 2, however, with this exception, that each time the laminations 6 and 9 lie in other yoke arms.
  • the laminations of a layer come to lie with their end edges remote from the common point of intersection in offset relation to the corresponding end edges of the laminations of adjacent layers (see the dotted lines in FIGS. 2-7). Consequently, the joints between the yoke arms and the coupling members come to lie in offset relation too, so that also the yoke arms and the coupling members intermesh with overlapping areas and thereby a strong mechanical connection is obtained.
  • FIGS. 2-7 show, that to form the yoke members of the magnetic core structure illustrated in FIG. 1 three different laminations are required. Two of these laminations, viz. the laminations 6 and 12, have a symmetrical shape and differ in length only, whereas the lamination 9 has an asymmetrical shape.
  • FIGS. 8, 9, 10 illustrate, that in each of the relevant layers of the yoke member each yoke arm may consist either of two laminations 15, 16 extending side by side and abutting with longitudinal edges 13, 14 parallel to the central longitudinal axis or of two equal laminations 19 and 20 extending side by side and abutting with the 15 longitudinal edges 17, 18, which coincide with the central longitudinal axis.
  • the lamination 15 has an oblique end edge 11
  • the lamination 16 an oblique end edge 10
  • the lamination 19 an oblique end edge 7 or 8
  • the lamination 20 also an oblique end edge 7 or 8.
  • a yoke member of this construction can be composed of four diiferent laminations, that means of the laminations 15, 16, 19 and 20.
  • a laminated magnetic core structure for a transformer or a choke coil of great power comprising three leg members extending with their central longitudinal axes in the longitudinal edges of an equilateral prism, two star-shaped yoke members, each of which consists of three abutting yoke arms enclosing angles of 120 and having central longitudinal axes, which intersect in a common point, and coupling members, each of which connects an end of a leg member with the free end of a yoke arm, and in which core structure in at least a part of the total number of layers of laminations of the yoke members each yoke arm abuts at its end facing the two other yoke arms said other yoke arms with two end edges meeting in an angular point, whereas in each of said layers the coinmon point of junction of said end edges of the yoke arms lies in offset relation in the direction of the central longitudinal axis of one of the yoke arms from the common point of intersection of the central longitudinal axe

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)
US699148A 1967-01-26 1968-01-19 Laminated magnetic core structures for transformers or choke coils of great power Expired - Lifetime US3453576A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6701228A NL6701228A (en, 2012) 1967-01-26 1967-01-26

Publications (1)

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US3453576A true US3453576A (en) 1969-07-01

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US699148A Expired - Lifetime US3453576A (en) 1967-01-26 1968-01-19 Laminated magnetic core structures for transformers or choke coils of great power

Country Status (7)

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US (1) US3453576A (en, 2012)
AT (1) AT279725B (en, 2012)
BE (1) BE709738A (en, 2012)
CH (1) CH459352A (en, 2012)
FR (1) FR1555002A (en, 2012)
NL (1) NL6701228A (en, 2012)
NO (1) NO119364B (en, 2012)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9007162B2 (en) * 2012-09-27 2015-04-14 Hamilton Sundstrand Corporation Laminated “Y”-core transformer
US20180130594A1 (en) * 2015-05-18 2018-05-10 Aem Cores Pty Ltd Core for a 3-phase transformer, and a 3-phase transformer
RU2831579C2 (ru) * 2022-12-06 2024-12-09 Юрий Аркадьевич Ошев Трехфазный пространственный шихтованный магнитопровод типа "звезда"

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2856522C2 (de) * 1978-12-28 1983-01-20 Transformatoren Union Ag, 7000 Stuttgart Eisenkern mit Kernschenkeln und Kernjochen für einen Dreiphasentransformator

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2456461A (en) * 1947-01-18 1948-12-14 Gen Electric Magnetic core
US2579578A (en) * 1948-11-26 1951-12-25 Westinghouse Electric Corp Three-phase core
US2634321A (en) * 1950-04-13 1953-04-07 Larkin Lectro Products Corp Transformer core
FR1229933A (fr) * 1959-03-25 1960-09-12 Comp Generale Electricite Circuit magnétique triphasé
US3195090A (en) * 1961-06-07 1965-07-13 Westinghouse Electric Corp Magnetic core structures

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2456461A (en) * 1947-01-18 1948-12-14 Gen Electric Magnetic core
US2579578A (en) * 1948-11-26 1951-12-25 Westinghouse Electric Corp Three-phase core
US2634321A (en) * 1950-04-13 1953-04-07 Larkin Lectro Products Corp Transformer core
FR1229933A (fr) * 1959-03-25 1960-09-12 Comp Generale Electricite Circuit magnétique triphasé
US3195090A (en) * 1961-06-07 1965-07-13 Westinghouse Electric Corp Magnetic core structures

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9007162B2 (en) * 2012-09-27 2015-04-14 Hamilton Sundstrand Corporation Laminated “Y”-core transformer
US20180130594A1 (en) * 2015-05-18 2018-05-10 Aem Cores Pty Ltd Core for a 3-phase transformer, and a 3-phase transformer
RU2842466C2 (ru) * 2021-11-01 2025-06-26 Инода Лтд. Магнитный сердечник
RU2835542C2 (ru) * 2021-12-08 2025-02-26 Инода Лтд. Устройство и способ для управления мощностью
RU2831579C2 (ru) * 2022-12-06 2024-12-09 Юрий Аркадьевич Ошев Трехфазный пространственный шихтованный магнитопровод типа "звезда"

Also Published As

Publication number Publication date
AT279725B (de) 1970-03-10
NL6701228A (en, 2012) 1968-07-29
NO119364B (en, 2012) 1970-05-11
FR1555002A (en, 2012) 1969-01-24
CH459352A (de) 1968-07-15
BE709738A (en, 2012) 1968-05-30

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