EP0807942A1 - wound component - Google Patents

wound component Download PDF

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Publication number
EP0807942A1
EP0807942A1 EP97303220A EP97303220A EP0807942A1 EP 0807942 A1 EP0807942 A1 EP 0807942A1 EP 97303220 A EP97303220 A EP 97303220A EP 97303220 A EP97303220 A EP 97303220A EP 0807942 A1 EP0807942 A1 EP 0807942A1
Authority
EP
European Patent Office
Prior art keywords
coil
shaped core
yoke
electrical component
core
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Withdrawn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
EP97303220A
Other languages
German (de)
English (en)
French (fr)
Inventor
Sung-Ho Lee
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.)
Samsung Electronics Co Ltd
Original Assignee
Samsung Electronics Co 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
Priority claimed from KR1019960015989A external-priority patent/KR100187256B1/ko
Priority claimed from KR1019960015988A external-priority patent/KR100187255B1/ko
Application filed by Samsung Electronics Co Ltd filed Critical Samsung Electronics Co Ltd
Publication of EP0807942A1 publication Critical patent/EP0807942A1/en
Withdrawn legal-status Critical Current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
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/08—High-leakage transformers or inductances
    • 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
    • H01F27/32—Insulating of coils, windings, or parts thereof
    • H01F27/324—Insulation between coil and core, between different winding sections, around the coil; Other insulation structures
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F2038/003—High frequency transformer for microwave oven

Definitions

  • the present invention relates to a wound electrical component comprising a yoke having an aperture through which a coil passes.
  • Microwave ovens usually use a magnetron to generate microwave for cooking food. Magnetrons require high voltages and microwave ovens therefore include high voltage transformers to provide the required high voltages.
  • Figures 1 and 2 show a typical high voltage transformer for powering the magnetron of a microwave oven.
  • the high voltage transformer has an E-shaped core 1 and an I-shaped core 3 which joined together.
  • the E-shaped core 1 is formed with two channels.
  • a primary coil 5 is wound from wire 5a, and is inserted to the channels of the E-shaped core 1.
  • a filament coil 7 is wound from wire 7a, and is inserted into the channels of the E-shaped core 1 above the primary coil 5.
  • Pass cores 9 are inserted into the channels of the E-shaped core 1 above the filament coil 7.
  • a secondary coil 11 is inserted into the channels of the E-shaped core 1 above the pass core 9.
  • Strips of insulation paper P are wound around the primary coil 5, the filament coil 7, the pass cores 9 and the secondary coil 11, to electrically insulated the coils 5, 7, 9 from the cores 1, 3.
  • a sheet S of insulating material, for example mica, is disposed between the primary coil 5 and the paper wrapped therearound.
  • a terminal plate 14 provided with a terminal 13 is fixed by adhesive tape T to one end of the primary coil 5.
  • a terminal plate 14 provided with a terminal 13 is fixed by adhesive tape T to one end of the secondary coil 11.
  • the primary coil 5 is wound using wire 5a.
  • a mica sheet S is then wound around the winding of the primary coil 5 and paper P is in turn wound over the mica sheet S.
  • the terminal plate 14 is then fixed to the coil 5 using adhesive tape T.
  • the completed primary coil 5 is then slipped over the middle arm of the E-shaped core 1 and pushed down to sit at the bottom of the channels in the core 1.
  • the filament coil 7 is wound and then wrapped in insulation paper P.
  • the assembled filament coil 7 is slipped over the middle arm of the E-shaped core 1 and pushed down to rest on top of the primary coil 5.
  • the pass cores 9 are wrapped with insulation paper P and positioned on the filament coil 7.
  • the secondary coil 11 is wound and then wrapped in insulation paper P.
  • the terminal plate 14 is fixed to one end of the secondary coil 11 using adhesive tape T.
  • the assembled secondary coil 11 is then slipped over the middle arm of the E-shaped core 1 and pushed down to rest on top of the pass cores 9.
  • the arms of the E-shaped core 1 are bridged with the I-shaped core 3.
  • the I-shaped core 3 is welded to the free ends of the arms of the E-shaped core 1 to form the transformer's yoke.
  • the high voltage transformer is inserted into an impregnation tank containing an impregnating material.
  • the impregnating material impregnates the transformer and protects it from rust and reduces the noise produced in use.
  • the transformer then is dried and used.
  • a problem with the afore-mentioned transformer is that insulation paper P must be manually wound around the coils and the pass core and then fixed with adhesive tape. Furthermore, it is desirable that the step of winding the mica sheet about the primary coil be avoided to simplify manufacture.
  • a wound electrical component according to the present invention is characterised in that an insulating liner is provided in the aperture between the coil and the yoke. It will be appreciated that the use of the liner reduces the amount of insulation paper required and that it is a simpler process to insert a liner than wrap a coil with paper as required by the prior art.
  • the present invention arose in the field of transformers microwave ovens, it will be appreciated that the present invention may be usefully employed in other fields; indeed wherever sheets of insulation material have been wrapped around coils to insulate the coils from the yoke. However, the present invention is particularly useful in respect of components adapted for operation with voltages greater than or equal to 300V, i.e. high voltages and greater.
  • a wound electrical component consist of one coil, for example a choke or an autotransformer.
  • the present invention can be usefully applied to components having a further coil passing through the aperture, for instance a transformer.
  • the yoke comprises an E-shaped member and an bar-shaped member linking the arms of the E-shaped member, the or each coil being arranged around the central arm of the E-shaped member and an insulating liner being provided in each aperture between a coil and the yoke.
  • a terminal for connecting a coil to a lead may be fixed to the yoke.
  • An alternative is to mount a terminal to a liner.
  • the high voltage transformer comprises an E-shaped core 1 and an I-shaped core 3 which are joined to form a yoke.
  • First and second liners 20 of insulating material are received within each channel in the E-shaped core 1.
  • a primary coil 5, wound from wire 5a, is inserted into the channels of the E-shaped core 1 such that the liners 20 are between the primary coil 5 and the E-shaped core 1.
  • a filament coil 7 is similarly inserted into the channels and rests on the primary coil 5.
  • Pass cores 9 are inserted into respective channels and rest on the filament coil 7 and are separated from the E-shaped core 1 by the liners 20.
  • a secondary coil 11 is inserted the channels of the E-shaped core 1 and rests on the pass cores 9. The secondary coil 11 is also insulated from the E-shaped core 1 by the liners 20.
  • Strips of insulation paper P are used to insulated the primary and filament coils 5, 7 from each other, to insulate the pass cores 9 from the secondary and filament coils 11, 7 and to insulate the secondary coil 11 from the I-shaped core 3. Only the filament coil 7 has strips of paper wrapped completely around and through its centre.
  • Screw holes 1a, 3a are provided in faces of the "upright" of the E-shaped core 1 and the parallel face of the I-shaped core 3 respectively.
  • the screw holes 1a, 3a receive screws 25 to fix terminal plates 23 to respective cores 1, 3.
  • the terminal plates 23 are formed with steps to bring their terminals 21 away from the cores 1, 3.
  • the liners 20 and the terminal plates 23 are moulded from polyphenylene sulphide or polybutylene terephthalate.
  • the primary coil 5 is installed without first being wound with the insulation paper P thereby reducing the number of steps in the manufacturing process.
  • a second embodiment of a transformer according to the present invention differs from the first embodiment, described above, in the form of the liners 30 and the use of some paper insulation on the primary coil 5.
  • the liners 30 are generally L-shaped and line the floors and outer walls of the channels in the E-shaped core 1.
  • the liners 30 are provided with flanges 30a to which terminals 32 are fixed with screws 31. This avoids the need to screw terminal plates to the cores 1, 3.
  • Insulator paper P is used on the primary winding to insulate it from the central arm of the E-shaped core 1 and from the filament winding 7, on the filament winding 7 to insulate it from the central arm of the E-shaped core 1, the primary winding 5 and the pass cores 9, on the pass cores 9 to insulate them from the secondary winding 11, and on the secondary winding to insulate it from the central arm of the E-shaped core 1 and the I-shaped core 3. It should be noted that only the filament coil 7 is completely wrapped with paper.
  • the liners 30 are moulded from polyphenylene sulphide or polybutylene terephthalate.
  • the liners 20 are inserted into the channels of the E-shaped core 1.
  • the primary coil 5 is formed with the wire 5a and is slipped over the central arm of the E-shaped core 1 and pushed to the bottom of the channels, without the primary coil 5 being wound with paper or a mica sheet.
  • the filament coil 7 is wrapped about with insulation paper P, slipped over the central arm of the E-shaped core 1 and pushed down to rest on the primary coil 5.
  • the assembled pass cores 9 are inserted into the channels of the E-shaped core 1 on top of filament coil 7.
  • the exposed upper parts of the pass cores 9 are covered with insulation paper P.
  • the secondary coil 11 is slipped over the central arm of the E-shaped core 1 and brought to rest on the pass core 9. Strips of insulating paper P are then placed on the secondary coil 11 to insulate it from the I-shaped core 3.
  • the I-shaped core 3 is welded to the E-shaped core 1 to complete the yoke.
  • the assembled transformer is soaked in impregnating material in a tank and thereafter dried.
  • the terminal plates 21 are screwed to the yoke using screws 25 which pass into the screw holes 1a, 3a.
  • the primary coil 5 is wound from wire 5a. Insulation paper P is then partially wound around the turns of the primary coil 5 (see Figure 5). Insulation paper P is wrapped around the turns of the filament coil 7. A strip of insulating paper P is wrapped around the top of each of the pass cores 9. Insulation paper P is also partially wrapped around the secondary coil 11 (see Figure 5). Thereafter, the primary coil 5, the filament coil 7, the pass cores 9 and the secondary coil 11 are stacked in the liners 30, to which the terminals 32 have previously been screwed. The liners 30 and stack of coils are inserted into the E-shaped core 1 over the central arm thereof. The I-shaped core 3 is then welded to the ends of the arms of the E-shaped core 1.
  • the assembled transformer is then impregnated with impregnating material in a tank to prevent rust forming and to reduce noise.
  • the transformer then is dried and used.
  • liners 30 means that a mica sheet need not be wound about the primary coil 5. Although insulation paper P is still used, it only partially wraps most of the components thereby simplifying assembly and the cost of the insulation paper P used.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Of Transformers For General Uses (AREA)
  • Insulating Of Coils (AREA)
  • Control Of High-Frequency Heating Circuits (AREA)
  • Constitution Of High-Frequency Heating (AREA)
EP97303220A 1996-05-14 1997-05-12 wound component Withdrawn EP0807942A1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR9615989 1996-05-14
KR1019960015989A KR100187256B1 (ko) 1996-05-14 1996-05-14 전자렌지용 고전압발생기의 절연장치
KR9615988 1996-05-14
KR1019960015988A KR100187255B1 (ko) 1996-05-14 1996-05-14 전자렌지용 고전압발생기의 절연장치

Publications (1)

Publication Number Publication Date
EP0807942A1 true EP0807942A1 (en) 1997-11-19

Family

ID=26631825

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97303220A Withdrawn EP0807942A1 (en) 1996-05-14 1997-05-12 wound component

Country Status (3)

Country Link
EP (1) EP0807942A1 (ja)
JP (1) JPH1092653A (ja)
CN (1) CN1177192A (ja)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0831500A2 (en) * 1996-09-21 1998-03-25 Samsung Electronics Co., Ltd. High voltage transformer
EP0981141A1 (en) * 1998-08-20 2000-02-23 Samsung Electronics Co., Ltd. High-voltage transformer
GB2348741A (en) * 1999-02-17 2000-10-11 Fagor S Coop Insulation for a microwave oven transformer
WO2000078100A1 (en) * 1999-06-15 2000-12-21 Matsushita Electric Industrial Co., Ltd. Magnetron drive step-up transformer and transformer of magnetron drive power supply

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20010037850A (ko) * 1999-10-20 2001-05-15 배길성 전자 렌지용 고압 트랜스
KR100810968B1 (ko) * 2006-11-10 2008-03-10 디피씨(주) 사출성형 절연재가 구비된 고압변압기
CN107768113B (zh) * 2017-11-24 2024-04-19 广州广日电气设备有限公司 变压器及其生产方法

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3387245A (en) * 1963-08-30 1968-06-04 Advance Transformer Co Laminated core with a termainal connector and retainer means
US3728656A (en) * 1972-06-26 1973-04-17 Gte Sylvania Inc Transormer and terminal assembly
JPS5658215A (en) * 1979-10-17 1981-05-21 Matsushita Electric Ind Co Ltd High-tension transformer
US4347490A (en) * 1981-03-06 1982-08-31 Prem Magnetics, Inc. Low profile transformer
JPS62154709A (ja) * 1985-12-27 1987-07-09 Tokyo Electric Co Ltd 漏洩変圧器
JPS62190826A (ja) * 1986-02-18 1987-08-21 Tabuchi Denki Kk 電子レンジ用トランスの製造方法
JPH01289105A (ja) * 1988-05-16 1989-11-21 Fujitsu Ltd トランス
US5440286A (en) * 1991-03-26 1995-08-08 North American Philips Corporation Electrical transformer structure with coil covers

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3387245A (en) * 1963-08-30 1968-06-04 Advance Transformer Co Laminated core with a termainal connector and retainer means
US3728656A (en) * 1972-06-26 1973-04-17 Gte Sylvania Inc Transormer and terminal assembly
JPS5658215A (en) * 1979-10-17 1981-05-21 Matsushita Electric Ind Co Ltd High-tension transformer
US4347490A (en) * 1981-03-06 1982-08-31 Prem Magnetics, Inc. Low profile transformer
JPS62154709A (ja) * 1985-12-27 1987-07-09 Tokyo Electric Co Ltd 漏洩変圧器
JPS62190826A (ja) * 1986-02-18 1987-08-21 Tabuchi Denki Kk 電子レンジ用トランスの製造方法
JPH01289105A (ja) * 1988-05-16 1989-11-21 Fujitsu Ltd トランス
US5440286A (en) * 1991-03-26 1995-08-08 North American Philips Corporation Electrical transformer structure with coil covers

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 005, no. 121 (E - 068) 5 August 1981 (1981-08-05) *
PATENT ABSTRACTS OF JAPAN vol. 011, no. 390 (E - 567) 19 December 1987 (1987-12-19) *
PATENT ABSTRACTS OF JAPAN vol. 012, no. 038 (E - 580) 4 February 1988 (1988-02-04) *
PATENT ABSTRACTS OF JAPAN vol. 014, no. 070 (E - 0886) 8 February 1990 (1990-02-08) *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0831500A2 (en) * 1996-09-21 1998-03-25 Samsung Electronics Co., Ltd. High voltage transformer
EP0981141A1 (en) * 1998-08-20 2000-02-23 Samsung Electronics Co., Ltd. High-voltage transformer
GB2348741A (en) * 1999-02-17 2000-10-11 Fagor S Coop Insulation for a microwave oven transformer
WO2000078100A1 (en) * 1999-06-15 2000-12-21 Matsushita Electric Industrial Co., Ltd. Magnetron drive step-up transformer and transformer of magnetron drive power supply
US6449178B1 (en) 1999-06-15 2002-09-10 Matsushita Electric Industrial Co., Ltd. Magnetron drive step-up transformer and transformer of magnetron drive power supply

Also Published As

Publication number Publication date
JPH1092653A (ja) 1998-04-10
CN1177192A (zh) 1998-03-25

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