US3428930A - 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
US3428930A
US3428930A US698319A US3428930DA US3428930A US 3428930 A US3428930 A US 3428930A US 698319 A US698319 A US 698319A US 3428930D A US3428930D A US 3428930DA US 3428930 A US3428930 A US 3428930A
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United States
Prior art keywords
yoke
laminations
magnetic core
edges
layers
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Expired - Lifetime
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US698319A
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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

  • a laminated magnetic core has three leg members extending with their central longitudinal axes in the longi; tudinal edges of an equilateral prism, two star-shaped yoke members, each of which consists of three abutting yoke arms enclosing angles of 120, and coupling members, each of which connects an end of a leg member with the free end of a yoke arm.
  • Each yoke arm has a central longitudinal axis which intersects, at a common point, the longitudinal axes of the remaining two yoke arms of a yoke member.
  • each yoke arm abuts the two other yoke arms with two straight end edges enclosing an angle of 120.
  • the projections of said end edges on a line extending in the direction of the width of the yoke arm have unequal lengths.
  • each yoke arm consists of two laminations extending sideby-side and abutting each other with longitudinal edges which are parallel to the central longitudinal axis of the relevant yoke arm.
  • Each one of said laminations is bounded at its end facing another yoke arm by a straight edge only, so that said laminations have widths which are equal to the said projections of said end edges, and the abutting longitudinal edges of the said two laminations of each yoke arm are in offset relation to each other in the direction of said longitudinal edges.
  • 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 the two other yoke arms with two straight end edges enclosing an angle of 120, the projections of said end edges on a line extending in the direction of the width of the yoke arm having unequal lengths.
  • each yoke arm consists in each of the said layers of a single lamination, of which the width is equal to that of the relevant yoke arm and the end edges abutting the laminations of the two other yoke arms meet in a salient angular point of 120.
  • the yoke arms cannot be made broader than the broadest available laminations. The cutting of the laminations in the required shape causes a considerable loss of material, since the laminations cannot be fitted together to form an uninterrupted area due to their salient angular points of 120.
  • the invention has the object to provide a similar magnetic core structure, which has some advantages over the known core structure owing to its special construction of the yoke members. It is characterized in that in the said layers each yoke arm consists of two laminations extending side by side and abutting each other with longitudinal edges which are parallel to the central longitudinal axis of the relevant yoke arm, each one of said laminations being bounded at its end facing another yoke arm by a straight'end edge only, so that said laminations have widths which are equal to the said projections of said end edges, and the angular points defined by said end edges and the abutting longitudinal edges of the said two laminations of each yoke arm lying in offset relation to each other in the direction of said longitudinal edges.
  • each yoke arm may consist in each layer of two laminations extending side by side in respect of its longitudinal axis, said yoke arms may be made broader than the broadest laminations available. Owing to the dilferent widths and to the offset relation of the angular points at the ends of the individual sets of laminations facing the common point of intersection, the longitudinal joints between the adjacent laminations in each one of the yoke arms and the joints between the end edges of the abutting laminations of different yoke arms are overlapped in a favourable manner, if layers or groups of layers having a given arrangement of the laminations alternate with layers or groups of layers having the symmetrical arrangement of the laminations.
  • the yoke members can be stacked of laminations which have only two different shapes. Furthermore it is easily possible to obtain between the free ends of the yoke arms and the coupling members of the core structure a connection, in which the joints between the yoke arms and the coupling members are favourably overlapped. An important advantage is also that the laminations can be cut from strips of appropriate widths without any loss of material.
  • the structure constructed in accordance with the invention permits to so rotate the two end edges directed at an angle of to one another and bounding the end of a layer of a yoke arm facing the common point of intersection in respect of the longitudinal direction of said yoke arm as to make them equally long.
  • This has the advantage that the laminations of different yoke arms abutting each other with their end edges are in contact with one another for the longest possible length and the magnetic flux is led from one lamination into the other in the most favourable way. Cavities in the magnetic core structure due to unequal lengths of said abutting end edges are then avoided.
  • FIG. 1 in perspective a laminated magnetic core structure according to the invention
  • FIG. 2 on a larger scale a plan view of a layer of laminations of a yoke member for a magnetic core struc ture shown in FIG. 1, and
  • FIG. 3 on a larger scale a plan view of a layer of laminations of a variant of the yoke member shown in FIG. 2.
  • FIG. 1 of the drawing three vertical leg members extending with their central longitudinal axes in the longitudinal edges of an equilateral prism are designated by 1, three horizontal yoke arms, of which the longit-udinal axes intersect in a common point 3 of intersection and enclose angles of 120 are indicated by 2 and circlecylindrically curved coupling members extending between said leg members and said yoke members are designated by 4, said leg, yoke and coupling members constituting the magnetic core structure of a transformer or a choke coil of-large power.
  • leg members and the coupling members consist of two laminations of equal widths separated by a cooling gap 5 from one another.
  • the yoke members consist in each layer of two different laminations 6, 7 per yoke arm 2 and that said laminations have unequal widths and are each bounded by a straight end edge 8, 9 at their ends facing the other yoke arms.
  • Each lamination 6 of a yoke arm abuts with its end edge 8 the end edge 9 of a lamination 7 of another yoke arm 2 and vice versa.
  • each yoke arm abut each other with longitudinal edges 10, 11 parallel to the longitudinal axis of said yoke arm and their end edges 8 and 9 are directed at an angle of 120 to one another and define together with said longitudinal edges 10, 11 angular points of 60, which lie in offset relation in the direction of the longitudinal axis.
  • layers, in which the laminations of each yoke arm are arranged in a given way alternate with layers, in which said laminations are arranged in the symmetrical way.
  • Such a symmetrically arranged layer is indicated in FIG. 2 by dotted lines.
  • each yoke arm consists of a narrower lamination 14 having end edges 15 and 16 and longitudinal edges 17 and 18 and a broader lamination 19 having end edges 20 and 21 and longitudinal edges 22 and 23.
  • the angle enclosed by the end edge 15 and the longitudinal edge 17 of the lamination 14 is so much smaller than 60 and the angle enclosed by the end edge 20 and the longitudinal edge 22 of the lamination 19 is so much greater than 60, as to form together an angle of 120 and to make the end edges 15 and 20 of equal lengths.
  • the longitudinal edges 17 and 22 and the longitudinal edges 18 and 23 of laminations of different yoke arms abutting each other with their end edges 15 and 20 meet, so that the cavities are suppressed and in each layer the transition from a lamination of any given yoke arm to a lamination of another yoke arm is as favorable as possible.
  • 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 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 the two other yoke arms with two straight end edges enclosing an angle of 120, the projections of said end edges on a line extending in the direction of the width of the yoke arm having unequal lengths, characterized in that in the said layers each yoke arm consists of two laminations extending side by side and abutting each other with longitudinal edges
  • each yoke arm consists of two laminations, of which the end edges abutting the two other yoke arms have the same lengths.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)
  • Coils Or Transformers For Communication (AREA)
US698319A 1967-01-26 1968-01-16 Laminated magnetic core structures for transformers or choke coils of great power Expired - Lifetime US3428930A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6701226A NL6701226A (fr) 1967-01-26 1967-01-26

Publications (1)

Publication Number Publication Date
US3428930A true US3428930A (en) 1969-02-18

Family

ID=19799134

Family Applications (1)

Application Number Title Priority Date Filing Date
US698319A Expired - Lifetime US3428930A (en) 1967-01-26 1968-01-16 Laminated magnetic core structures for transformers or choke coils of great power

Country Status (10)

Country Link
US (1) US3428930A (fr)
AT (1) AT281980B (fr)
BE (1) BE709737A (fr)
CH (1) CH460940A (fr)
DE (1) DE1638647A1 (fr)
FR (1) FR1554995A (fr)
GB (1) GB1217903A (fr)
NL (1) NL6701226A (fr)
NO (1) NO121219B (fr)
SE (1) SE332456B (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8410884B2 (en) 2011-01-20 2013-04-02 Hitran Corporation Compact high short circuit current reactor
US9007162B2 (en) * 2012-09-27 2015-04-14 Hamilton Sundstrand Corporation Laminated “Y”-core transformer
JP2016131180A (ja) * 2015-01-13 2016-07-21 東芝産業機器システム株式会社 静止誘導機器用鉄心
US20180130594A1 (en) * 2015-05-18 2018-05-10 Aem Cores Pty Ltd Core for a 3-phase transformer, and a 3-phase transformer

Families Citing this family (3)

* 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
CA2942011A1 (fr) * 2014-03-21 2015-09-24 General Electric Company Appareil electromagnetique et procede de fourniture de ce dernier
WO2019078737A1 (fr) * 2017-10-17 2019-04-25 Pontifica Universidad Católica Del Perú Procédé pour la fabrication de transformateurs triphasés modulaires à noyau triangulaire à pièces en y

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1594001A (en) * 1925-04-07 1926-07-27 New Jersey Zinc Co Method of making zinc sulphide
US2367927A (en) * 1943-03-27 1945-01-23 Westinghouse Electric & Mfg Co Three-phase transformer core
US2456459A (en) * 1947-01-18 1948-12-14 Gen Electric Magnetic core
US3195090A (en) * 1961-06-07 1965-07-13 Westinghouse Electric Corp Magnetic core structures

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1594001A (en) * 1925-04-07 1926-07-27 New Jersey Zinc Co Method of making zinc sulphide
US2367927A (en) * 1943-03-27 1945-01-23 Westinghouse Electric & Mfg Co Three-phase transformer core
US2456459A (en) * 1947-01-18 1948-12-14 Gen Electric Magnetic core
US3195090A (en) * 1961-06-07 1965-07-13 Westinghouse Electric Corp Magnetic core structures

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8410884B2 (en) 2011-01-20 2013-04-02 Hitran Corporation Compact high short circuit current reactor
US9007162B2 (en) * 2012-09-27 2015-04-14 Hamilton Sundstrand Corporation Laminated “Y”-core transformer
JP2016131180A (ja) * 2015-01-13 2016-07-21 東芝産業機器システム株式会社 静止誘導機器用鉄心
US20180130594A1 (en) * 2015-05-18 2018-05-10 Aem Cores Pty Ltd Core for a 3-phase transformer, and a 3-phase transformer

Also Published As

Publication number Publication date
GB1217903A (en) 1971-01-06
SE332456B (fr) 1971-02-08
DE1638647A1 (de) 1971-03-11
CH460940A (de) 1968-08-15
NO121219B (fr) 1971-02-01
FR1554995A (fr) 1969-01-24
BE709737A (fr) 1968-05-30
AT281980B (de) 1970-06-10
NL6701226A (fr) 1968-07-29

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