[go: up one dir, main page]

WO1997020451A1 - Plaque chauffante fonctionnant par induction - Google Patents

Plaque chauffante fonctionnant par induction Download PDF

Info

Publication number
WO1997020451A1
WO1997020451A1 PCT/DK1996/000494 DK9600494W WO9720451A1 WO 1997020451 A1 WO1997020451 A1 WO 1997020451A1 DK 9600494 W DK9600494 W DK 9600494W WO 9720451 A1 WO9720451 A1 WO 9720451A1
Authority
WO
WIPO (PCT)
Prior art keywords
conductor
hotplate
coil
hotplate according
induction heating
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.)
Ceased
Application number
PCT/DK1996/000494
Other languages
English (en)
Inventor
Laurent Jeanneteau
Christian Eskildsen
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.)
Electrolux AB
Original Assignee
Electrolux AB
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 Electrolux AB filed Critical Electrolux AB
Priority to AU76218/96A priority Critical patent/AU7621896A/en
Publication of WO1997020451A1 publication Critical patent/WO1997020451A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/12—Cooking devices
    • H05B6/1209—Cooking devices induction cooking plates or the like and devices to be used in combination with them

Definitions

  • the invention concerns an induction heating hotplate comprising a coil and a core structure in a magnetic material .
  • Hotplates for induction heating of food usually consists of a disc shaped coil which is disposed in conjunction with magnetic material so as to shape the magnetic field to engage a vessel to heated.
  • WO94/05137 it is described how such a coil is embedded in a concrete-like material with the core structure made of a magnetic concrete.
  • the coils for such hotplates are habitually manufactured according to the Litz principle, i.e. the conductor consists of a number of individually insulated conductors which are joined at the ends and run in parallel but scrambled like in a telephone cable rather than in a uniform rope fashion. This is due to the skin effect which is considerable at the ultrasonic frequencies involved and which means that the centre of a conductor does not contribute to conduction of these frequencies.
  • Litz wire in great lenghts is expensive because its manufacture comprises a large number of steps. Manufacturers of induction hotplates hence resort to local manufacture of the shorter pieces needed for the coils, but this is a complication requiring a large number of bobbins which have to be reloaded before each new piece. Also, the individual connection of each and every wire to the circuit puts a special demand on workmanship which is difficult to automate.
  • An advantageous embodiment of the invention uses a strip shaped conductor with its flat side perpendicular to the cooking surface. This is an efficient use of the conductor and one which has good cooling properties.
  • a further advantageous embodiment of the invention is particular in that the conductor is hollow. In this way the use of conducting material not contributing to conduction is avoided to a large measure.
  • a further advantageous embodiment is particular in that the hollow conductor is in the form of an extruded tube. This provides the particular advantage that the coil assembly may cool down quickly.
  • a further advantageous embodiment supports the conductor material by means of a structure which is open to air circulation. This brings the further advantage that convective cooling may be used efficiently to permit a higher thermal loading of the conductive material .
  • a process for the manufacture of a coil according to the invention is particular in that molten conductor material is cast in situ in a spiral shaped channel in an electrical insulator.
  • the advantage of the configuration lies in that its insulation is much simpler than in the known case and that the use of an insulating support will permit casting in situ. A rough surface would even be tolerated in the insulating support which may hence itself be cast in an insulating material before pouring the conductor.
  • a further process for the manufacture of a coil according to the invention is particular in that the channel is formed partly of heat tolerant insulating material and partly of removable pieces of mould.
  • Aluminium presents itself as having particular advantages, because it i ⁇ both more environmentally friendly and less expensive for equivalent current carrying capacity than copper. This material is al ⁇ o simple to cast and to extrude.
  • Fig. 1 shows the lay-out of a coil according to the invention
  • Fig. 2 shows cross sections of conductors which are useful in the invention
  • Fig. la an electrical hotplate of the induction type constructed according to the invention.
  • a spiral shaped conductor strip 1 is supported by electrically insulating struts 2 which project upwards from the bottom part 3 of the well into which the coil is fitted.
  • the bottom part is made of magnetically conductive material, ⁇ uch as a magnetic concrete.
  • the magnetically conductive material rises skirt-like around the coil. This construction permits air-cooling of the coil 1 due to the provision of holes 4 in the bottom part.
  • Fig. lb is shown a vertical section through a coil 1 which has been manufactured by casting in situ in electrically insulating material 5 which has a magnetically conductive material 6 surrounding it.
  • FIG. 2 various cross-sections of conductor 1 which perform according to the invention when formed into a spiral.
  • a typical coil has 20 turns of increasing diameter and a lenght of conductor of ca. 9 .

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Induction Heating (AREA)

Abstract

Dans une plaque chauffante fonctionnant par induction, la surface disponible pour les courants haute fréquence doit être élevée par rapport à la section transversale. Ceci est habituellement réalisé avec un fil métallique de Lintz qui est coûteux parce que chaque fil métallique individuel doit être isolé par une laque. Selon l'invention, on obtient une surface suffisante en utilisant une bande de matériau conducteur qui est disposé verticalement dans un bobinage horizontal. En supportant la bande sans l'enfermer, on peut faire circuler de l'air de refroidissement. Une autre possibilité est que du métal fondu soit coulé dans un noyau, pour assurer un bon contact thermique.
PCT/DK1996/000494 1995-11-27 1996-11-27 Plaque chauffante fonctionnant par induction Ceased WO1997020451A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU76218/96A AU7621896A (en) 1995-11-27 1996-11-27 An induction heating hotplate

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK1340/95 1995-11-27
DK134095 1995-11-27

Publications (1)

Publication Number Publication Date
WO1997020451A1 true WO1997020451A1 (fr) 1997-06-05

Family

ID=8103779

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DK1996/000494 Ceased WO1997020451A1 (fr) 1995-11-27 1996-11-27 Plaque chauffante fonctionnant par induction

Country Status (2)

Country Link
AU (1) AU7621896A (fr)
WO (1) WO1997020451A1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0922909A1 (fr) * 1997-12-11 1999-06-16 E.G.O. ELEKTRO-GERÄTEBAU GmbH Corps de chauffe, en particulier pour ustensiles de cuisine
DE10006863C2 (de) * 2000-02-04 2002-08-29 Aeg Hausgeraete Gmbh Gareinrichtung
DE10011773B4 (de) * 2000-03-10 2004-10-21 AEG Hausgeräte GmbH Induktions-Gareinrichtung mit Abschirmeinrichtung
WO2005043960A1 (fr) * 2003-10-30 2005-05-12 BSH Bosch und Siemens Hausgeräte GmbH Inducteur comprenant un toron enroule sous forme de bobine d'induction en spirale
WO2008017373A1 (fr) * 2006-08-11 2008-02-14 E.G.O. Elektro-Gerätebau GmbH Support de bobine pour inducteur
DE102012206991A1 (de) * 2012-04-26 2013-10-31 Behr-Hella Thermocontrol Gmbh Heizkörper
EP3030044B1 (fr) 2014-12-04 2019-06-12 BSH Hausgeräte GmbH Plaque de cuisson
WO2021093995A1 (fr) * 2019-11-13 2021-05-20 Magment Gmbh Unité de transmission et/ou de réception pour un système de transmission d'énergie par induction

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4029926A (en) * 1974-10-29 1977-06-14 Roper Corporation Work coil for use in an induction cooking appliance
AU640338B3 (en) * 1993-02-26 1993-08-19 Lungchiang Hu Watercool electromagnetic induction heating wok
EP0565186A2 (fr) * 1992-04-10 1993-10-13 Balay, S.A. Plan de cuisson électrique à chauffage par induction

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4029926A (en) * 1974-10-29 1977-06-14 Roper Corporation Work coil for use in an induction cooking appliance
EP0565186A2 (fr) * 1992-04-10 1993-10-13 Balay, S.A. Plan de cuisson électrique à chauffage par induction
AU640338B3 (en) * 1993-02-26 1993-08-19 Lungchiang Hu Watercool electromagnetic induction heating wok

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0922909A1 (fr) * 1997-12-11 1999-06-16 E.G.O. ELEKTRO-GERÄTEBAU GmbH Corps de chauffe, en particulier pour ustensiles de cuisine
US6184502B1 (en) 1997-12-11 2001-02-06 E.G.O. Elektro-Geratebau Gmbh Heater, particularly for kitchen appliances
DE10006863C2 (de) * 2000-02-04 2002-08-29 Aeg Hausgeraete Gmbh Gareinrichtung
DE10011773B4 (de) * 2000-03-10 2004-10-21 AEG Hausgeräte GmbH Induktions-Gareinrichtung mit Abschirmeinrichtung
WO2005043960A1 (fr) * 2003-10-30 2005-05-12 BSH Bosch und Siemens Hausgeräte GmbH Inducteur comprenant un toron enroule sous forme de bobine d'induction en spirale
WO2008017373A1 (fr) * 2006-08-11 2008-02-14 E.G.O. Elektro-Gerätebau GmbH Support de bobine pour inducteur
DE102012206991A1 (de) * 2012-04-26 2013-10-31 Behr-Hella Thermocontrol Gmbh Heizkörper
EP3030044B1 (fr) 2014-12-04 2019-06-12 BSH Hausgeräte GmbH Plaque de cuisson
WO2021093995A1 (fr) * 2019-11-13 2021-05-20 Magment Gmbh Unité de transmission et/ou de réception pour un système de transmission d'énergie par induction

Also Published As

Publication number Publication date
AU7621896A (en) 1997-06-19

Similar Documents

Publication Publication Date Title
US5866884A (en) High efficiency induction cooking-range
GB2342986A (en) Direct-cooled magnet coil
CN102473508A (zh) 具有改进冷却的干式变压器
WO1997020451A1 (fr) Plaque chauffante fonctionnant par induction
US6798105B1 (en) Electrical machine with a winding
RU2521963C2 (ru) Электрический проводник сильноточного проходного изолятора
US6121591A (en) Flux guiding and cooling arrangements for induction heating units
EP0408230A2 (fr) Conducteurs de litz fermant des brins de câble semi-comprimés, et séparés, pour permettre le refroidissement entre les brins individuels isolés
JP4794725B2 (ja) 誘導加熱装置用加熱コイル
US20040089468A1 (en) Induction winding
CN216450495U (zh) 一种基于硅橡胶绝缘的高压绕组及变压器
US20200411230A1 (en) Methods, apparatus and systems for dry-type transformers
JP3675015B2 (ja) 誘導加熱装置の製造方法
JP2009105078A (ja) 誘導加熱装置用加熱コイル
US5109208A (en) Current limiting electrical reactor
CN2593327Y (zh) 一种导电线芯及由其制造的绕组用电缆
JPH07103660A (ja) コ−ルドウォ−ル誘導溶解炉
CN216054192U (zh) 一种具有瓦楞状散热结构的干式变压器低压绕组
JP2530509Y2 (ja) 高周波加熱コイル
US3668584A (en) Electrical power apparatus
JPH0424909A (ja) 電磁誘導機器
CN213403567U (zh) 一种不改变电容的移动式感应加热装置
JP4915444B2 (ja) 誘導加熱装置用加熱コイル
JPH0732065B2 (ja) 誘導加熱調理器
JPH0341446Y2 (fr)

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AL AM AT AT AU AZ BB BG BR BY CA CH CN CZ CZ DE DE DK DK EE EE ES FI FI GB GE HU IS JP KE KG KP KR KZ LK LR LS LT LU LV MD MG MK MN MW MX NO NZ PL PT RO RU SD SE SG SI SK SK TJ TM TR TT UA UG US UZ VN AM AZ BY KG KZ MD RU TJ TM

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): KE LS MW SD SZ UG AT BE CH DE DK ES FI FR GB GR IE IT LU MC NL PT SE BF

121 Ep: the epo has been informed by wipo that ep was designated in this application
REG Reference to national code

Ref country code: DE

Ref legal event code: 8642

122 Ep: pct application non-entry in european phase