EP0938106A1 - Spule - Google Patents

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Publication number
EP0938106A1
EP0938106A1 EP98929707A EP98929707A EP0938106A1 EP 0938106 A1 EP0938106 A1 EP 0938106A1 EP 98929707 A EP98929707 A EP 98929707A EP 98929707 A EP98929707 A EP 98929707A EP 0938106 A1 EP0938106 A1 EP 0938106A1
Authority
EP
European Patent Office
Prior art keywords
core
ring
coil
coils
bar
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.)
Withdrawn
Application number
EP98929707A
Other languages
English (en)
French (fr)
Other versions
EP0938106A4 (de
Inventor
Hitoshi Yoshimori
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.)
SHT Corp Ltd
Original Assignee
SHT Corp Ltd
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 SHT Corp Ltd filed Critical SHT Corp Ltd
Publication of EP0938106A1 publication Critical patent/EP0938106A1/de
Publication of EP0938106A4 publication Critical patent/EP0938106A4/de
Withdrawn legal-status Critical Current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
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F37/00—Fixed inductances not covered by group H01F17/00
    • 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

Definitions

  • the present invention relates to coils. More specifically, the present invention relates to those coils for use transformers, choke coils, etc. which comprise a ring-like core and a bar core put on the face thereof and have the structure in which the bar core is wound with an electrically conductive material so that the coils incurs only a little iron loss and are easy to fabricate.
  • the coils used or electric and electronic circuits have conventionally been produced by winding an electrically conductive material such as copper wire on a bar-like, pipe-like or ring-like magnetic material.
  • an electrically conductive material such as copper wire on a bar-like, pipe-like or ring-like magnetic material.
  • toroidal coils with copper wire wound on a ring-like magnetic material have been used widely for such applications as high-frequency circuits in recent years.
  • those coils using wound cores obtained by winding and stacking each other a thin strip of a magnetic material in the form of a rectangular ring are also used widely.
  • the work of winding copper wire on a core of a shape having no end, such as toroidal coils is complicated and cannot be automated easily.
  • the inventor of the present invention studied such structure of coils that would solve these problems and make the manufacture of coils by a simple process possible and would show superior mass producibility, favorable economics and little iron loss. As a result, found that it is possible to manufacture coils that can be produced at high productivity and entails little iron loss, compared with the conventional coils with a wound core wound with copper wire, by winding an electrically conductive material on a bar core, while adopting a structure comprising a ring-like core and a bar core put on the face of the ring-like core. This led to the invention of the present invention.
  • the present invention is concerned with a coil comprising a ring-like core made of amorphous or microcrystalline metal on the surface of which at least one bar core whose length is longer than the inside diameter of the aforesaid ring-like core is placed and fixed, with the aforesaid bar core wound with an electrically conductive material.
  • the most preferable structure is such coil that comprises at least two the aforesaid ring-like cores between the surfaces of which at least one bar core whose length is longer than the inside diameter of the aforesaid ring-like core is inserted and fixed, with the aforesaid bar core wound with an electrically conductive material.
  • Fig. 1 is one example of a sketch drawing of the coil of the present invention.
  • Coil 1 consists of two Ring-like Cores 2, 2 and Bar Core 5 inserted and fixed between the aforesaid one set of ring-like cores, and Bar Core 5 is wound with Copper Wire 6.
  • the ring-like core of the coil is made of amorphous or microcrystalline metal.
  • Metal Tape 7 is wound in the form of a ring and stacked in layers so that a core is formed.
  • amorphous or microcrystalline metal is used for the material of the ring-like core. This makes it possible to obtain coils showing little iron loss.
  • Amorphous metal is a metal having no crystalline structure that is obtained by quenching a molten metal.
  • An alloy having such composition that it contains transition metal selected from Fe, Co or Ni, particularly Fe, as its indispensable metal component and B, C, P or Si as its non-metal component is preferable as the material of the wound core of the coil of the present invention because of low iron loss and high saturation magnetic flux density.
  • Microcrystalline metal is a soft, microcrystalline magnetic alloy material. It is formed by preparing non-crystalline metal tape by melting and quenching an alloy containing Fe, Si or B as the basic component and a small amount of elements such as Cu, Nb, Ta, Mo and Zr and then by subjecting the tape to heat treatment to crystallize it to form supermicrocrystals of 10 nm order.
  • the shape of the ring-like core is generally a rectangular ring shape consisting of Long Side 3 and Short Side 4 as shown in Fig. 1 but may be toroidal or oval.
  • the core is produced by the method in which a long tape of amorphous or microcrystalline metal is wound and stacked in layers on the core.
  • the coil is formed by putting a bar core on at least one ring-like core and winding an electrically conductive material on the bar core, but a bar core(s) may be inserted between the faces of not less than two ring-like cores.
  • a bar core(s) may be inserted between the faces of not less than two ring-like cores.
  • the number of the bar core that is put on the ring-like core is normally one, but it may also be not less than two.
  • the bar core is preferably positioned in the central part of the ring-like in parallel with one of the ring-like core, particularly its long side.
  • the length of the bar core has to be longer than the inner rim of the ring-like core so that the bar core can be placed on the ring-like core. Normally the length of the bar core is equal to or a little shorter than that of the outer rim of the ring-like core.
  • the shape of the bar core may be any indefinite shape but is most preferably a rectangular shape having the same effective cross-sectional area as that of the ring-like core.
  • Laminates of thin boards and blocks are used as the form of the bar core, depending on the type of the materials.
  • materials in the form of thin tape such as amorphous or microcrystalline metal and silicon steel
  • Thin boards may be bound to form a cylindrical shape.
  • a resin such as epoxy resin may also be impregnated into them to fix them as required.
  • ferrite a block-like core is used.
  • such bar core is preferably formed by laminating magnetic tape in such manner that the width direction of the tape is at right angles with the face direction of the ring-like core as shown in Fig. 1 (In Fig. 1, the width direction of Tape 8 is upward and downward and crosses the face of the ring-like core that is placed in the horizontal position.)
  • the use of such bar core offers an advantage because there will be no occurrence of eddy current, hence little iron loss since the laminated face of Tape 8 is in parallel with the laminated face of Tape 7 at the side (Long Side 3 in Fig. 1) of the ring-like core that is in a position parallel with the bar core and moreover the face of the magnetic tape forming the ring-like core and that of the magnetic tape forming the bar core do not come into contact.
  • the bar core is put and fixed on the face of the ring-like core or inserted and fixed between the faces of two ring-like cores.
  • Contact Area 9 between bar core and ring-like core is either fixed in contact with each other or has a gap between them, depending on the uses of the coil.
  • the faces of the bar core and the ring-like core are brought into contact in such manner that there is as small a gap between them as possible by grinding the aforesaid faces, for example.
  • a proper Gap 10 is provided as shown in Fig. 2.
  • a gap may be provided between the bar core and the two ring-like cores at both ends where the bar core and ring-like core are in contact with each other.
  • the bar core is wound with an electrically conductive material so that a coil is formed. Copper wire is most generally used for the electrically conductive material. The number of turns may be selected optionally according to applications.
  • the electrically conductive material may be wound directly in the form of bar core. However, the bar core may also be covered with the electrically conductive material wound on a bobbin or the like. In either case in the present invention, work can be done with great ease because copper wire is wound on the bar core. Further, in the present invention, since the coil is formed by winding copper wire on the bar core, the coil may be used as it is, but the ring-like core may also be wound with copper wire as required.
  • the coil of the present invention can be fabricated simply by combining the ring-like wound core and the bar core with an electrically conductive material wound on it. Because of this, coils of any optional size may be produced by the present invention, and the size may be selected as appropriate according to the material used, applications and performance requirements.
  • the coil of the present invention not only can be fabricated easily and economically but also has the advantages of little iron loss and lower energy consumption.
  • the bar core is wound with copper wire, which is housed within the frame of the surrounding ring-like core.
  • the coil becomes compact in structure and makes the reduction of the size of the equipment incorporating the coil possible.
  • the coil of the present invention is used for applications such as transformers and choke coils.
  • the coil is used for choke coils, it is used by adjusting appropriately the gap at the area of contact between the bar core and the ring-like core.
  • Two rectangular ring-like cores whose rectangular inner frame size is 60 x 55 mm, whose outer frame size is 75 x 70 mm and which is 10 mm in height were prepared by winding and stacking in layer an amorphous metal ribbon (available from Nippon Amorphous Metals Co., Ltd.; composition: Fe, main component, Ni, Si and B) on a rectangular core.
  • an amorphous metal ribbon available from Nippon Amorphous Metals Co., Ltd.; composition: Fe, main component, Ni, Si and B
  • the iron loss against magnetic flux density at a frequency of 1 kHz was measured by means of Digital Power Meter 2532, available from Yokogawa Electric Corporation by using the aforesaid coil. Results of the measurement are shown in A of Fig. 3.
  • a cut core was prepared by cutting the central part of a rectangular ring-like core with the rectangular inner frame size of 70 x 20 mm, the outer frame size of 105 x 52 mm and a height of 25 mm which was prepared by winding and stacking in layer the same amorphous metal ribbon that was used in Example 1 on a rectangular core. This cut core was wound by 50 turns with copper wire, with the result that a cut core coil was prepared.
  • the iron loss against magnetic flux density was measured in the same manner as described in Example 1 by using the cut core coil. Results of the measurement are shown in B of Fig. 3.
  • the coil of the present invention shows less iron loss and energy loss than the conventional cut core coil obtained by winding copper wire on a cut core.
  • a choke coil was formed by putting a bar core on the one rectangular ring-like core used for the coil of Example 1 with a 3-mm gap provided at the areas (two) of contact between the rectangular ring-like core and the bar core as shown in Fig. 2.
  • the relationship of this coil between superimposed current and inductance at a frequency of 1 kHz was measured, and the direct current superimposition properties were evaluated. Results are shown in a of Fig. 4.
  • a circular ring-like core 60 mm in outside diameter, 35 mm in inside diameter and 25 mm in width which has a 3-mm gap and about the same core weight as that of the coil of Example 1 was prepared.
  • a toroidal coil was prepared by making 47 turns of winding copper on the aforesaid circular ring-like core, and the relationship of this coil between superimposed current and inductance at a frequency of 1 kHz was measured, and the direct current superimposition properties were evaluated. Results are shown in b of Fig. 4.
  • the coil of the present invention shows a less decrease in inductance due to an increase in electric current than the conventional toroidal coil.
  • coils can be obtained simply by inserting a bar core with an electrically conductive material wound on it into a ring-like wound core, and thus the present invention provides a very easy coil fabrication method compared with the conventional coils obtained by winding copper wire on a ring-like core.
  • the coil of the present invention shows less iron loss than the coils using conventional cut cores, and therefore offers the excellent advantages of being able to save energy and showing a small decrease in inductance due to an increase in electric current. Because of this, the coil of the present invention can be utilized for a wide range of applications, such as transformers and choke coils.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)
  • Soft Magnetic Materials (AREA)
EP98929707A 1997-07-11 1998-06-26 Spule Withdrawn EP0938106A4 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP9186782A JPH1131613A (ja) 1997-07-11 1997-07-11 コイル
JP18678297 1997-07-11
PCT/JP1998/002867 WO1999003116A1 (fr) 1997-07-11 1998-06-26 Bobine

Publications (2)

Publication Number Publication Date
EP0938106A1 true EP0938106A1 (de) 1999-08-25
EP0938106A4 EP0938106A4 (de) 2000-11-29

Family

ID=16194511

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98929707A Withdrawn EP0938106A4 (de) 1997-07-11 1998-06-26 Spule

Country Status (5)

Country Link
EP (1) EP0938106A4 (de)
JP (1) JPH1131613A (de)
KR (1) KR20000068543A (de)
CN (1) CN1231057A (de)
WO (1) WO1999003116A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1225601A3 (de) * 2001-01-22 2002-07-31 Tokin Corporation Induktives Bauteil
WO2019238709A1 (de) * 2018-06-11 2019-12-19 Eugen Forschner Gmbh Vorrichtung zur verbesserung der elektromagnetischen verträglichkeit

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100850030B1 (ko) * 2006-09-19 2008-08-04 최인실 슬림형 자기회로 소자
CN102339668A (zh) * 2010-07-26 2012-02-01 周尧达 节能灯的电感镇流器
DE102015205762A1 (de) * 2014-04-04 2015-10-08 Yazaki Corporation Spulenbefestigungsstruktur

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE383436B (sv) * 1974-07-12 1976-03-08 Asea Ab Transformator for spenningsprovning
JPS58147011A (ja) * 1982-02-25 1983-09-01 Matsushita Electric Ind Co Ltd 薄形トランス
JPS58140625U (ja) * 1982-03-16 1983-09-21 東亜通信工業株式会社 変成器
JPS58162014A (ja) * 1982-03-19 1983-09-26 Matsushita Electric Ind Co Ltd 薄形トランス
JPS5926209U (ja) * 1982-08-10 1984-02-18 松下電器産業株式会社 薄形トランス
JP2515435B2 (ja) * 1991-01-31 1996-07-10 太陽誘電株式会社 トランス

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1225601A3 (de) * 2001-01-22 2002-07-31 Tokin Corporation Induktives Bauteil
US6853285B2 (en) 2001-01-22 2005-02-08 Nec Tokin Corporation Inductor component
WO2019238709A1 (de) * 2018-06-11 2019-12-19 Eugen Forschner Gmbh Vorrichtung zur verbesserung der elektromagnetischen verträglichkeit

Also Published As

Publication number Publication date
KR20000068543A (ko) 2000-11-25
EP0938106A4 (de) 2000-11-29
JPH1131613A (ja) 1999-02-02
CN1231057A (zh) 1999-10-06
WO1999003116A1 (fr) 1999-01-21

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