EP3324703B1 - Dispositif de chauffage par induction à des fins industrielles - Google Patents

Dispositif de chauffage par induction à des fins industrielles Download PDF

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Publication number
EP3324703B1
EP3324703B1 EP16199592.3A EP16199592A EP3324703B1 EP 3324703 B1 EP3324703 B1 EP 3324703B1 EP 16199592 A EP16199592 A EP 16199592A EP 3324703 B1 EP3324703 B1 EP 3324703B1
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EP
European Patent Office
Prior art keywords
heating element
induction
magnetic yoke
magnetic
induction coil
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.)
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Application number
EP16199592.3A
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German (de)
English (en)
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EP3324703A1 (fr
Inventor
Mathias Jotter
Borgar Pfeiffer
Hauke RAMM
Jochen Stegelmann
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.)
KENDRION KUHNKE AUTOMATION GmbH
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Kendrion Kuhnke Automation GmbH
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Publication of EP3324703A1 publication Critical patent/EP3324703A1/fr
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    • 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
    • H05B6/105—Induction heating apparatus, other than furnaces, for specific applications using a susceptor
    • 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
    • H05B6/36—Coil arrangements
    • H05B6/365—Coil arrangements using supplementary conductive or ferromagnetic pieces

Definitions

  • the invention relates to an induction heating device for industrial purposes or applications and to a method for operating an induction heating device.
  • US 2011/0297668 A1 shows a humidifier with an inductive heating device, which has a ferrite body with a cavity in which an induction coil is arranged.
  • the heating device is arranged below a plate.
  • a device for inductively heating a workpiece which has several heating modules.
  • Each heating module has three poles, with a coil arranged around each pole.
  • Each of the modules also has a lower part, so that heat can be dissipated from the upper part by means of a cooling medium.
  • US 4,999,467 A discloses a low frequency electromagnetic induction heater having six induction coils electrically connected in a three-phase double delta connection.
  • An induction heating device with an exciter for induction heating of a body is known.
  • the induction heating device is intended, for example, to heat a cooking pot.
  • the exciter comprises an iron core and a yoke as well as four magnetic poles and four excitation windings wound around the magnetic poles.
  • US 2008/0303194 A1 shows various devices and methods for producing a polymer using induction heat.
  • the device includes a mold with an upper mold plate and a lower mold plate.
  • the upper mold plate has a magnetic surface that is heated by an induction coil in a lower mold plate.
  • the object of the invention is to provide a heating system for industrial applications or purposes, such as in a packaging machine or the like, wherein a homogeneous temperature distributed over a surface is to be provided, for example for an adhesive process or sealing process.
  • an induction heating device for industrial purposes or industrial applications with at least one surface inductor having an induction coil to which alternating voltage can be applied and with a heating element that can be heated by the surface inductor and that has a surface facing the surface inductor and with a magnetic yoke for guiding the magnetic field generated or that can be generated by the induction coil, wherein the induction coil and the magnetic yoke are designed in such a way that a constant power input per surface area for heating the heating element takes place via the surface of the heating element facing the surface inductor and a homogeneous temperature field is generated or can be generated in the heating element via the surface facing the surface inductor, wherein the induction coil has at least one uneven winding, wherein in field areas with a strong coupling to the heating element the distances between the turns are increased, while in field areas with a weak coupling the turns are spaced closer together, wherein the induction heating device is further developed in that the surface inductor is connected to at least one local position has an additional turn
  • the induction heating device has an electrical coil as an induction coil, by means of which a magnetic field with alternating polarization can be generated to generate heat in an electrically conductive heating element, in particular a heating plate or the like, penetrated by the alternating magnetic field. Due to the alternating electromagnetic field of the induction coil when the induction coil is subjected to alternating voltage, eddy currents are induced in the heating element and remagnetizations are generated, whereby due to remagnetization losses and ohmic losses caused by the eddy currents, the power transferred into the radiator is converted into heat, thereby causing a homogeneous temperature distribution in the radiator.
  • the induction heating device is used, for example, in industrial induction heating systems for mechanical engineering, in which in particular a temperature field with a low temperature gradient or with a constant temperature, i.e. a homogenized temperature field for the bonding or sealing processes or the like, is required.
  • induction heating device in induction hardening systems, induction heating furnaces, induction heating rollers or induction cookers with control units where a homogeneous temperature distributed over a large area with tight tolerances is required, for example for bonding or sealing processes.
  • the field distribution of the magnetic field is determined by the shape of the induction coil and the design of the magnetic yoke for guiding the (alternating) magnetic field.
  • the magnetic yoke guides the magnetic field generated by the induction coil in such a way that the magnetic field is coupled preferably or optimally into the soft magnetic, electrically conductive radiator.
  • this makes it possible to heat the radiator or the heating plate, which is arranged opposite the induction coil, in such a way that the radiator has a homogenized temperature field on its heat-emitting side or contact side.
  • the induction coil and the magnetic yoke are designed in such a way and, if necessary, coordinated with one another in their geometric dimensions, it is possible for a predetermined, constant power per area to be transmitted by means of the alternating magnetic field over the entire surface of the heating element facing the surface inductor, whereby a homogeneous temperature field is generated in the heating element over the entire surface at a predetermined temperature with a tolerance of less than ⁇ 5%, preferably less than ⁇ 3% or less than ⁇ 1%.
  • the induction coil is designed as a cylindrical coil or flat coil and/or that the heating element is designed as a heating plate.
  • the heating element or the heating plate has a flat surface facing the induction coil.
  • the heating element is preferably designed as a cuboid heating plate.
  • the magnetic yoke is designed such that the induction coil is surrounded by the magnetic yoke or is accommodated therein.
  • the induction coil has at least one uneven winding, since this achieves a uniform coupling of the magnetic field over the entire coupling surface of the coil to the radiator, in particular heating plate, due to an uneven arrangement of the winding of the coil, for example as a flat coil, since this increases the distances between the windings, in particular individually, in field areas with a strong coupling to the radiator, while in field areas with weak coupling the turns are closer together.
  • a predetermined, preferably optimal, field distribution of the magnetic field is created for a homogeneous temperature distribution in the radiator or heating plate.
  • the surface inductor has an additional winding at at least one local position in a different winding plane than the winding plane of the induction coil.
  • the surface inductor has at least one local additional coil, preferably at a predetermined position, in addition to the induction coil, so that the coupling between the induction coil and the heating element is influenced in a targeted manner.
  • the additional winding(s) or additional coil(s) are in areas of weak coupling or in areas of local modifications of the coil winding course, for example in the case of flat or spatially formed meandering serpentine lines.
  • an embodiment of the induction heating device is characterized in that the magnetic yoke comprises soft magnetic material, in particular soft magnetic ferrite, or is made of soft magnetic material, in particular ferrite.
  • the magnetic yoke is in particular made of soft magnetic ferrite material, which is designed or shaped in such a way that the coupling of the magnetic field in areas that are strongly magnetically coupled to the heating element is weakened by sections of the magnetic yoke and the coupling of the magnetic field in areas that are weakly magnetically coupled to the heating element is strengthened by sections of the magnetic yoke.
  • the magnetic yoke has at least one recess and/or the magnetic yoke has different cross-sections in individual sections, so that the field profile of the magnetic field can be modified or modified.
  • the magnetic yoke is thus designed in such a way that the flow of the magnetic flux strengthens the coupling areas of the heating element with a weak coupling to the magnetic yoke and weakens the coupling areas of the heating element with a weak coupling to the magnetic yoke.
  • the end faces of the magnetic yoke facing the heating element are adapted or designed in such a way that the flow of the magnetic flux is amplified in at least one coupling region of the heating element with weak coupling to the magnetic yoke and/or the flow the magnetic flux is weakened in at least one coupling region of the radiator with strong coupling to the magnetic yoke.
  • the distance between the end faces of the magnet yoke facing the heating body and the heating body is adjustable and/or that at least two areas of the end faces of the magnet yoke facing the heating body have different distances from the heating body.
  • the end faces of the magnet yoke are designed in their cross-section and/or in their position relative to the heating body such that the distance of the end faces from the heating body and thus also an air gap between the Magnetic yoke and the heating element are locally adjustable.
  • the inner transition of the magnetic yoke to the heating element in a magnetic yoke with a flat coil is set back or stepped compared to a minimum possible distance and/or the outer transition of the magnetic yoke to the heating element is not designed in the spatially maximum possible configuration.
  • the magnetic yoke can be designed in such a way that the end faces of the magnetic yoke to the heating plate have different distances in several sections.
  • the flow of the magnetic flux can be specifically influenced or caused by amplification or weakening by using different cross-sections of the magnetic yoke in different sections of the magnetic yoke.
  • the distances can also be formed by a linear or non-linear course from the surface of the heating plate to the front face of the magnetic yoke.
  • the induction heating device provides a homogeneous temperature field in the radiator or the heating plate, whereby hotspots in the radiator are avoided according to the invention.
  • the object is achieved by a method for operating an induction heating device described above for industrial purposes or industrial applications, wherein the induction coil and the magnetic yoke are designed such that A constant power input per area is applied to heat the radiator over the surface of the radiator facing the surface inductor and a homogeneous temperature field is generated in the radiator over the surface facing the surface inductor.
  • the induction coil and the magnetic yoke are designed such that A constant power input per area is applied to heat the radiator over the surface of the radiator facing the surface inductor and a homogeneous temperature field is generated in the radiator over the surface facing the surface inductor.
  • Fig.1 shows in a perspective view of a half model an induction heating device 10 for industrial applications or purposes.
  • the induction heating device 10 has an electrically conductive heating plate 12 which is cuboid-shaped and has flat surfaces.
  • a magnetic yoke corresponding to the external dimensions of the heating plate 12 is arranged below the heating plate 12, with an induction coil 16 being accommodated in the magnetic yoke 14.
  • the induction coil 16 is designed as a flat coil, with the turns of the induction coil 16 being arranged in a spiral shape.
  • the induction coil 16 is operated or charged with an alternating electrical voltage so that an alternating electromagnetic field is generated by the induction coil 16, so that the alternating electromagnetic field of the induction coil 16 generates eddy currents and remagnetization in the heating plate 12, whereby the power is transferred to the heating plate 12, so that a homogeneous temperature distribution is achieved in the heating plate 12 over the entire surface of the heating plate 12 that faces the induction coil.
  • the heating plate 12 is made of a soft magnetic and electrically conductive material.
  • the induction coil 16 has turns 161, 162, 163 which are spaced apart at different distances from one another, for example the inner turns 161 are spaced more closely apart than the middle turns 162.
  • the outer turns 163 are in turn spaced apart at a smaller distance than the middle turns 162.
  • the closely spaced turns 161 are arranged in field areas with a weak coupling to the heating plate 12, while the further apart (middle) turns 162 are arranged in areas with a strong coupling.
  • the outer, more closely spaced turns 163 are also arranged in field areas with a strong coupling between the induction coil 16 and the heating plate 12.
  • the magnetic yoke 14 is preferably made of soft magnetic ferrite material, with the magnetic yoke 14 being designed in such a way that areas that are strongly magnetically coupled to the heating plate 12 experience a weakening of the coupling and areas that are weakly magnetically coupled are strengthened.
  • the induction heating device 10 shown differs from that shown in Fig.1 illustrated induction heating device 10 in that in the area of weak coupling an additional coil 166 is additionally formed at a local point above the induction coil 16 designed as a flat coil.
  • an additional winding 165 can also be arranged above the (normal) winding level of the induction coil 16.
  • the additional winding can also be arranged below the winding level of the induction coil 16.
  • Fig.3 In the perspective view of the magnetic yoke 14, it is shown that the magnetic yoke 14 has recesses 141 on the underside, which are arranged in the region of the strong coupling of the magnetic field with the heating plate 12.
  • Fig.3 shown that the magnet yoke 14 has an end face 142 facing the heating plate 12, wherein Modification of the coupling areas, the front surface 142 can have flattened areas 143, for example on the long side. This varies the distance between the magnet yoke 14 and the heating plate 12. Furthermore, the front surface 142 can also have elevations or raised areas at local positions.

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

Claims (8)

  1. Dispositif (10) de chauffage par induction à des fins industrielles ou pour des applications industrielles avec au moins un inducteur plan présentant une bobine d'induction (16) apte à être alimentée en tension alternative et avec un corps de chauffe (12) apte à être chauffé par l'inducteur plan, qui présente une surface orientée vers l'inducteur plan, et avec une culasse magnétique (14) pour le guidage du champ magnétique généré ou apte à être généré par la bobine d'induction (16), la bobine d'induction (16) et la culasse magnétique (14) étant conçues de telle sorte qu'un apport de puissance constant par surface pour le chauffage du corps de chauffe (12) s'effectue par l'intermédiaire de la surface du corps de chauffe (12) tournée vers l'inducteur plan et qu'un champ de température homogène soit généré ou soit apte à être généré dans le corps de chauffe par l'intermédiaire de la surface tournée vers l'inducteur plan, la bobine d'induction (16) présentant au moins un enroulement non uniforme, les distances entre les spires étant augmentées dans les zones de champ à liaison forte avec le corps de chauffe (12), tandis que dans les zones de champ à liaison faible, les spires présentent une distance plus étroite, caractérisé en ce que l'inducteur plan présente, à côté de la bobine d'induction (16), en au moins une position locale, une spire supplémentaire (166) dans un autre plan d'enroulement que le plan d'enroulement de la bobine d'induction (16).
  2. Dispositif (10) de chauffage par induction selon la revendication 1, caractérisé en ce que la bobine d'induction (16) est conçue sous la forme d'une bobine cylindrique ou une bobine plate et/ou en ce que le corps de chauffe (12) est conçu sous la forme d'une plaque chauffante (12).
  3. Dispositif (10) de chauffage par induction selon la revendication 1 ou la revendication 2, caractérisé en ce que l'inducteur plan comporte, près de la bobine d'induction (16), au moins une bobine supplémentaire locale (165), de préférence en une position prédéterminée.
  4. Dispositif (10) de chauffage par induction selon l'une des revendications 1 à 3, caractérisé en ce que la culasse magnétique (14) présente un matériau magnétique doux, en particulier de la ferrite magnétique douce, ou est fabriquée en matériau magnétique doux, en particulier en ferrite.
  5. Dispositif (10) de chauffage par induction selon l'une des revendications 1 à 4, caractérisé en ce que la culasse magnétique (14) présente au moins un évidement et/ou la culasse magnétique (14) présente différentes sections transversales, de sorte que la forme du champ magnétique est apte à être modifiée ou est modifiée.
  6. Dispositif (10) de chauffage par induction selon l'une des revendications 1 à 5, caractérisé en ce que les surfaces frontales de la culasse magnétique (14) tournées vers le corps de chauffe (12) sont adaptées ou conçues de telle sorte que la forme du flux magnétique est apte à être renforcée dans le cas d'au moins une zone de liaison du corps de chauffe (12) avec une liaison faible à la culasse magnétique (14) et/ou que la forme du flux magnétique est affaiblie dans le cas d'au moins une zone de liaison du corps de chauffe (12) avec une liaison forte à la culasse magnétique (14).
  7. Dispositif (10) de chauffage par induction selon l'une des revendications 1 à 6, caractérisé en ce que la distance entre les surfaces frontales de la culasse magnétique (14) tournées vers le corps chauffant (12) et le corps chauffant (12) est réglable et/ou en ce qu'au moins deux zones des surfaces frontales de la culasse magnétique (14) tournées vers le corps chauffant (12) présentent des distances différentes par rapport au corps chauffant (12).
  8. Procédé pour faire fonctionner un dispositif (10) de chauffage par induction à des fins industrielles ou pour des applications industrielles, le dispositif (10) de chauffage par induction étant conçu selon l'une des revendications 1 à 6, la bobine d'induction (16) et la culasse magnétique (14) étant conçues de telle sorte qu'un apport de puissance constant par surface est effectué pour chauffer le corps chauffant (12) par l'intermédiaire de la surface du corps chauffant (12) tournée vers l'inducteur plan et qu'un champ de température homogène est produit dans le corps chauffant (12) par l'intermédiaire de la surface tournée vers l'inducteur plan.
EP16199592.3A 2016-11-18 2016-11-18 Dispositif de chauffage par induction à des fins industrielles Active EP3324703B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP16199592.3A EP3324703B1 (fr) 2016-11-18 2016-11-18 Dispositif de chauffage par induction à des fins industrielles

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP16199592.3A EP3324703B1 (fr) 2016-11-18 2016-11-18 Dispositif de chauffage par induction à des fins industrielles

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EP3324703A1 EP3324703A1 (fr) 2018-05-23
EP3324703B1 true EP3324703B1 (fr) 2024-08-07

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Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113974211B (zh) * 2021-12-02 2025-02-25 湖北中烟工业有限责任公司 一种适用于电磁加热的烟支
CN115418453B (zh) * 2022-08-30 2023-11-24 湖南大学 用于吸能结构局部均匀强化与弱化的处理系统及方法

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080303194A1 (en) * 2007-06-08 2008-12-11 Sabic Innovative Plastics Ip B.V. Mold apparatus for forming polymer and method

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5217572B2 (fr) * 1972-08-18 1977-05-17
CA2008232C (fr) * 1989-01-23 1994-07-19 Atsushi Iguchi Appareil de chauffage a induction, electromagnetique, a basse frequence
SE513131C2 (sv) * 1998-11-26 2000-07-10 Linlan Induction Ab Anordning för induktiv uppvärmning, press, användning av anordningen samt förfarande för styrning av anordningen
DE102007059812A1 (de) 2007-12-11 2009-06-18 Multivac Sepp Haggenmüller Gmbh & Co. Kg Verpackungsmaschine mit Induktionsheizung
US8476562B2 (en) * 2010-06-04 2013-07-02 Watlow Electric Manufacturing Company Inductive heater humidifier

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080303194A1 (en) * 2007-06-08 2008-12-11 Sabic Innovative Plastics Ip B.V. Mold apparatus for forming polymer and method

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