EP0485341B1 - Petit transformateur, et procédé pour sa fabrication - Google Patents

Petit transformateur, et procédé pour sa fabrication Download PDF

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Publication number
EP0485341B1
EP0485341B1 EP91810851A EP91810851A EP0485341B1 EP 0485341 B1 EP0485341 B1 EP 0485341B1 EP 91810851 A EP91810851 A EP 91810851A EP 91810851 A EP91810851 A EP 91810851A EP 0485341 B1 EP0485341 B1 EP 0485341B1
Authority
EP
European Patent Office
Prior art keywords
iron core
covers
webs
windings
small transformer
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 - Lifetime
Application number
EP91810851A
Other languages
German (de)
English (en)
Other versions
EP0485341A1 (fr
Inventor
Ruedi Kaelin
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.)
Aspro Tech AG
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0485341A1 publication Critical patent/EP0485341A1/fr
Application granted granted Critical
Publication of EP0485341B1 publication Critical patent/EP0485341B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H01F27/24—Magnetic cores
    • H01F27/26—Fastening parts of the core together; Fastening or mounting the core on casing or support
    • H01F27/266—Fastening or mounting the core on casing or support
    • 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
    • H01F27/02—Casings
    • H01F27/022—Encapsulation
    • 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
    • H01F41/005—Impregnating or encapsulating
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/4902—Electromagnet, transformer or inductor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/4902—Electromagnet, transformer or inductor
    • Y10T29/49073—Electromagnet, transformer or inductor by assembling coil and core

Definitions

  • the invention relates to a method for producing a small transformer with a laminated iron core and with primary and secondary windings which are received by a coil former, the central opening of which is penetrated by the iron core, the winding parts projecting beyond the iron core on both sides, each with a lid forming thermoplastic plastic compound are overmolded and the lids are integrally connected to one another by first webs which penetrate and fill the cavities between the windings and the iron core and the laminated iron core is fixed in itself by second webs connecting the two lids and the production in a single operation in one Injection mold is made.
  • the invention relates to a small transformer with an iron core, with primary and secondary windings which are received by a coil former, the winding parts projecting beyond the iron core are encapsulated on both sides by a cover made of thermoplastic plastic, the two covers connected to one another by first webs are, which penetrate and fill the cavities between the windings and the iron core and thereby fix the windings and insulate each other, and the cover connecting second webs are present which fix the iron core in itself.
  • DE-B-1 140 988 discloses a transformer cast with cold-curing casting resin, in which the mold for casting with the casting resin is formed by two shells, which surround the windings on two sides and the spaces between the two shells and the Iron core and the winding is cast with casting resin. The two shells can remain on the casting. The cumbersome production method with slowly hardening casting resin is not eliminated.
  • US-A-3 813 763 relates to a manufacturing method for the stator of an electric motor. Layered lamellae are pressed together in a device to form a package, and in this compressed state, a coil former made of plastic is sprayed on. The coil former is then provided with a single winding. This body is then introduced into a second mold and provided with a plastic housing on the end face. The whole thing is then inserted into a horseshoe-shaped stator, which closes the magnetic flux together with the plate pack.
  • DE-A-2 441 864 shows an inductive element with a core made up of lamellae. Side clamps made of plastic are available to hold the core together. Instead of the usual rivets that penetrate the plate pack, holes in the corner area of the plate pack are filled with plastic, which are connected to the clamps.
  • the object of the invention is to provide a small transformer which - compared to conventional designs - has
  • the plastic injection molding process can be produced very efficiently, is suitable for production in large series, manages with a low consumption of plastic mass and in which the electrical safety distances can be maintained without additional effort despite the compact design.
  • the invention makes it possible, on the one hand, to fix the windings in such a way that they cannot move relative to the iron core and, on the other hand, to keep the laminated iron core package in place, so that the riveting with metal rivets, which is otherwise common with laminated iron cores, or the welding of the core package is eliminated.
  • the two covers and the associated first and second webs are sprayed on efficiently in a single operation in the plastic injection molding process with comparatively low consumption of plastic. This creates a vibration-resistant product, in which the electrical safety distances can be reliably maintained.
  • the small transformer is designed for a power of about 0.2-400 VA. It contains a laminated iron core 2 in the form of a package layered from individual sheets.
  • the iron core 2 contains a sheet-metal package 2 'in E-shape, which is supplemented by a sheet-metal packet in I-shape 2 ".
  • I-shape 2 " In the assembled state, the sheets of the E- and I-shape lie directly against one another. Further design variants arise by using other sheet metal shapes.
  • the middle leg of the E-packet 2 ' is inserted into the cavity 20 of a coil former 5 and then the I-packet 2 "is added to the outside, as can be seen from the figure.
  • the two core packs 2', 2" are thereby held by holding cams 10 of the bobbin 5 is supported.
  • the bobbin 5 is passed through Support walls 17 and 19 held and separated from each other by a partition 18.
  • the two windings 3, 4 and the coil former 5 protrude beyond the iron core 2 on both sides.
  • the covers 6, 7 lie against the lamella edges adjacent to the central opening of the iron core.
  • the injected plastic also penetrates into the cavities between the windings 3, 4 and the iron core 2 and forms first webs. As a result, the windings 3, 4 are secured in their position in a vibration-resistant manner on the one hand in the coil former 5 and on the other hand in the iron core 2.
  • second webs 14 with a curved cross section on the outside of the iron core 2. These are integrally connected to both lids 6, 7 via ribs 8. Thus, the two covers 6, 7 together with the first and second webs form a single, contiguous piece of plastic.
  • a first embodiment variant consists in the fact that the second webs 14 each penetrate holes at the corners of the iron core 2, instead of the corresponding webs 14 arranged on the outside at the corners.
  • connection between the two covers 6, 7 is made by connecting strands which surround the iron core on the outside.
  • a thermal protection element is installed in the coil former 5 to protect against inadmissible heating.
  • the features described enable particularly efficient production with little outlay on raw materials and semi-finished products.
  • the testing effort and the failure rate can be reduced.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Insulating Of Coils (AREA)
  • Housings And Mounting Of Transformers (AREA)
  • Transformers For Measuring Instruments (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)

Claims (4)

  1. Procédé pour fabriquer un petit tranformateur avec un noyau en fer (2) constitué de lamelles en forme de E et de I, avec des enroulements primaires et secondaires (3, 4) qui sont bobinés sur une armature de bobine (5), dans lequel la portion médiane du noyau feuilleté en fer (2) est introduite dans l'ouverture centrale (20) de l'armature de bobine (5) et le noyau en fer est constitué à partir des lamelles en forme de E et de I, un couvercle (6, 7) en une matière plastique thermodurcissable est alors injecté sur les portions d'enroulement surplombant le noyau en fer (2) pour protéger ces portions d'enroulement, et ainsi les couvercles (6, 7) s'appuient sur les bords de lamelles adjacents à l'ouverture centrale, les couvercles (6, 7) sont reliés l'un à l'autre pour former une seule pièce par des premières entretoises qui pénètrent dans les cavités entre les enroulements (3, 4) et le noyau en fer (2) et les remplissent, et le noyau feuilleté en fer (2) est maintenu en place par des deuxièmes entretoises reliant les deux couvercles (6, 7), et la fabrication des couvercles et des premières et deuxièmes entretoises a lieu en une seule étape d'usinage dans un moule à injection.
  2. Petit transformateur avec un noyau en fer (2) constitué de lamelles en forme de E et de I et des enroulements primaires et secondaires (3, 4) qui sont reçus par une armature de bobine (5) présentant une ouverture centrale dont, la portion médiane des lamelles en forme de E et de I traverse l'ouverture centrale (20) de l'armature de bobine (5), les portions d'enroulement (3, 4) surplombant le noyau en fer (2) sont enrobées chacune des deux côtés par un couvercle (6, 7) constitué en matière plastique thermodurcissable recouvrant ces portions d'enroulement, de sorte que les couvercles (6, 7) s'appuient sur les bords de lamelles adjacents à l'ouverture centrale, les deux couvercles (6, 7) sont réunis pour former une seule pièce par des premières entretoises qui pénètrent dans les cavités entre les enroulements (3, 4) et le noyau en fer (2) et les remplissent et fixent ainsi les enroulements (3, 4) et les isolent l'un de l'autre, et des deuxièmes entretoises reliant les couvercles (6, 7) sont prévues qui maintiennent en position assemblée le noyau en fer.
  3. Petit transformateur selon la revendicaion 2, caractérisé en ce que les deuxièmes entretoises (14) du noyau en fer (2) l'entourent de l'extérieur et relient les couvercles (6, 7).
  4. Petit transformateur selon la revendication 2, caractérisé en ce que les deuxièmes entretoises traversent des trous aux angles du noyau en fer (2) et sont liées aux couvercles (6, 7) pour former une seule pièce.
EP91810851A 1990-11-07 1991-11-04 Petit transformateur, et procédé pour sa fabrication Expired - Lifetime EP0485341B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CH3536/90 1990-11-07
CH353690 1990-11-07
CH2853/91 1991-09-26
CH285391 1991-09-26

Publications (2)

Publication Number Publication Date
EP0485341A1 EP0485341A1 (fr) 1992-05-13
EP0485341B1 true EP0485341B1 (fr) 1996-04-17

Family

ID=25691567

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91810851A Expired - Lifetime EP0485341B1 (fr) 1990-11-07 1991-11-04 Petit transformateur, et procédé pour sa fabrication

Country Status (11)

Country Link
US (2) US5483405A (fr)
EP (1) EP0485341B1 (fr)
JP (1) JP2832769B2 (fr)
CN (1) CN1030592C (fr)
AT (1) ATE137050T1 (fr)
CA (1) CA2055010C (fr)
DE (1) DE59107683D1 (fr)
DK (1) DK0485341T3 (fr)
ES (1) ES2088789T3 (fr)
GR (1) GR3020526T3 (fr)
TW (1) TW233367B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102023103960A1 (de) 2023-02-17 2024-08-22 Preh Gmbh Spulenkörper, Transformator mit einem Spulenkörper sowie Anordnung desselben in einem Gehäuse

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2114564C (fr) * 1993-02-05 1998-05-26 Shigeo Ichida Boitier pour transformateur et bobine, et corps de bobine correspondant
WO1996025752A1 (fr) * 1995-02-15 1996-08-22 Electronic Craftsmen Limited Transformateur et procede d'assemblage
JP2925998B2 (ja) * 1996-02-29 1999-07-28 三洋電機株式会社 充電器
DE19923360B4 (de) * 1999-05-21 2010-01-07 Werner Turck Gmbh & Co. Kg Spannungswandler mit einem Potentialtrennungsschutz
US6271742B1 (en) 1999-07-27 2001-08-07 Aspro Technology Ag Mains adapter and method for its production
MY120386A (en) * 1999-07-28 2005-10-31 Samsung Electronics Co Ltd High voltage transformer for microware oven and method of manufacturing therefor.
JP2001332418A (ja) * 2000-05-23 2001-11-30 Sanden Corp コイルボビン
KR20040068680A (ko) * 2003-01-27 2004-08-02 삼성전자주식회사 고압 변압기
ES2257156B1 (es) * 2004-07-15 2007-07-16 Jose Cambronero Garcia Primer certificado de adicion a la patente 200101129: transformador protegido por tapas y banda de material elastico aislante con doble sistema de anclaje, a bancada y a carril y una sola hilera de terminales.
JP5916298B2 (ja) * 2011-03-30 2016-05-11 株式会社タムラ製作所 コイル装置
CN103310967B (zh) * 2013-06-27 2015-10-21 慈溪市国兴电子有限公司 一种开关电源用变压器的生产方法
CN108682543B (zh) * 2018-05-09 2024-07-02 浙江富特科技股份有限公司 平面变压器
CN108820746A (zh) * 2018-07-28 2018-11-16 合肥市菲力克斯电子科技有限公司 一种变压器骨架的锁定转移定位系统
US11842837B2 (en) * 2021-01-15 2023-12-12 Zhongbian Group Shanghai Transformer Co., Ltd. Dry-type transformer with elliptical iron core

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DE1140988B (de) * 1960-12-02 1962-12-13 Goltermann Mit Giessharz vergossener Transformator oder Drossel
US3445797A (en) * 1967-03-16 1969-05-20 Mallory & Co Inc P R Inductor coil and bobbin with terminals
US3516040A (en) * 1968-08-05 1970-06-02 Micron Sealing Corp Transformer structure
US3813763A (en) * 1970-12-17 1974-06-04 Gen Electric Laminated structure with insulating member formed in situ thereon and method for making same
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US3821678A (en) * 1973-10-02 1974-06-28 Westinghouse Electric Corp Transformer having a cast winding structure with integral insulating barriers
FR2321054A1 (fr) * 1975-08-14 1977-03-11 Sev Marchal Bobine d'allumage
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DE3505367A1 (de) * 1985-02-15 1986-08-28 Daimler-Benz Ag, 7000 Stuttgart Zuendspule fuer brennkraftmaschinen
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102023103960A1 (de) 2023-02-17 2024-08-22 Preh Gmbh Spulenkörper, Transformator mit einem Spulenkörper sowie Anordnung desselben in einem Gehäuse

Also Published As

Publication number Publication date
CN1030592C (zh) 1995-12-27
GR3020526T3 (en) 1996-10-31
JP2832769B2 (ja) 1998-12-09
DE59107683D1 (de) 1996-05-23
ES2088789T3 (es) 1996-09-16
DK0485341T3 (da) 1996-08-05
ATE137050T1 (de) 1996-05-15
US5577316A (en) 1996-11-26
JPH0513251A (ja) 1993-01-22
TW233367B (fr) 1994-11-01
CN1062428A (zh) 1992-07-01
CA2055010A1 (fr) 1992-05-08
EP0485341A1 (fr) 1992-05-13
CA2055010C (fr) 1998-05-19
US5483405A (en) 1996-01-09

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