WO2014088423A1 - Appareil et procédé pour chauffage par induction de matériaux magnétiques - Google Patents

Appareil et procédé pour chauffage par induction de matériaux magnétiques Download PDF

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Publication number
WO2014088423A1
WO2014088423A1 PCT/NO2013/050213 NO2013050213W WO2014088423A1 WO 2014088423 A1 WO2014088423 A1 WO 2014088423A1 NO 2013050213 W NO2013050213 W NO 2013050213W WO 2014088423 A1 WO2014088423 A1 WO 2014088423A1
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WO
WIPO (PCT)
Prior art keywords
workpiece
coil
superconducting
magnetic field
magnetic
Prior art date
Application number
PCT/NO2013/050213
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English (en)
Inventor
Niklas Magnusson
Magne Runde
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Sinvent As
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 Sinvent As filed Critical Sinvent As
Publication of WO2014088423A1 publication Critical patent/WO2014088423A1/fr

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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
    • H05B6/36—Coil arrangements
    • H05B6/44—Coil arrangements having more than one coil or coil segment
    • 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
    • H05B6/06—Control, e.g. of temperature, of power
    • 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
    • H05B6/40—Establishing desired heat distribution, e.g. to heat particular parts of workpieces
    • 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
    • H05B2206/00—Aspects relating to heating by electric, magnetic, or electromagnetic fields covered by group H05B6/00
    • H05B2206/02—Induction heating
    • H05B2206/023—Induction heating using the curie point of the material in which heating current is being generated to control the heating temperature

Definitions

  • the present invention concerns an apparatus and a method for induction heating of a workpiece comprising at least one magnetic material.
  • Induction heating is used to heat metals for a wide range of purposes. In some applications, such as induction hardening, it is desirable to rapidly heat the surface (and not the interior), whereas for other applications, such as through heating, it is desired to accomplish deep heating in the material (to decrease the heating time).
  • the heating depth is determined by the so-called skin depth of the material.
  • the skin depth, ⁇ 5 is the depth at which the amplitude of the current has fallen to 0.37 (1/e) of its value at the surface, and can for practical purposes be approximated by where p is the electrical resistivity, f is the frequency of the alternating current, ⁇ 0 is the magnetic permeability in air, and ⁇ ,- the relative magnetic permeability.
  • the skin depth can be controlled by varying the frequency.
  • the frequency is chosen to be high, whereas for through heating, the frequency is low.
  • the coupling between the induction coil and the workpiece becomes poor and very high magnetic fields, and hence high currents in the AC induction coil, are needed.
  • magnetic materials having a substantial relative magnetic permeability it can be difficult to accomplish deep heating, while maintaining a reasonable electromagnetic coupling.
  • the Curie temperature is the temperature at which the magnetic properties of the material vanish. Different frequencies are needed to optimize the induction heating process below and above the Curie temperature.
  • Induction heating applying a low frequency of 50 or 60 Hz, is used e.g. for through heating of non-magnetic (aluminum, copper, brass) billets at extrusion works prior to extrusion.
  • the induction heating process is clean, accurate and may be based on renewable energy resources.
  • oil or gas fired heaters are used for through heating in industrial processes. The use of oil and gas fired furnaces has several
  • the heat is supplied only at the surface, limiting the heat input and relying on thermal conductivity to heat the center part of the workpiece.
  • the energy efficiency of the process is in many cases poor, e.g. only around 40% for heating of steel slabs.
  • unwanted oxide scales may appear on the surfaces.
  • the process is inevitably based on CO 2 producing fuels.
  • the primary reason for not choosing induction heating is the small skin depth of magnetic materials, resulting in a slow heating process as the heat deposition is limited to the skin depth as well as resulting in overheating of irregularities on the surfaces of the workpiece, and there has so far been presented no technical and economical solution to overcome these problems.
  • US2836694A The problem with the change of electric circuit parameters when passing the Curie temperature has been addressed in US2836694A.
  • a DC coil adjacent to the workpiece or a core adjacent to the workpiece
  • two different generators are used with different frequencies or different magnetic field strengths below and above the Curie temperature.
  • US2836694A does however not provide any solution to the problems for induction through heating of magnetic materials since 1 ) the DC magnetic field is generated with very high energy losses if possible at all, yielding a poor energy efficiency; 2) the attainable DC magnetic field is limited to around 1 T (which do not fully saturate e.g.
  • the invention provides an apparatus for induction heating of a workpiece, the workpiece comprising at least one magnetic material heatable by a current induced by an applied AC magnetic field, the apparatus comprising at least one superconducting DC coil adapted for generating at least a DC magnetic field controlling a magnetic permeability of the workpiece.
  • At least one AC coil may be provided for generating the AC magnetic field.
  • the at least one AC coil may be arranged between the at least one superconducting DC coil and the workpiece.
  • the at least one AC coil may positioned adjacent to the workpiece, wherein at least one side of the workpiece is left free for loading and unloading of the workpiece.
  • a magnitude of the DC magnetic field is variable by varying the current in the at least one superconducting DC coil.
  • the apparatus may in an embodiment further comprise at least one yoke made of magnetic material for guiding the DC magnetic field generated by the at least one
  • At least one electrically conducting shield may be provided protecting the at least one superconducting DC coil from the AC magnetic fields.
  • the apparatus may comprise at least one set of compensating coils, positioned outside the at least one superconducting coil, reducing the magnetic field strength outside these coils.
  • the invention also provides a method for induction heating of a workpiece, the workpiece comprising at least one magnetic material, the method comprising: heating the workpiece by applying at least one AC magnetic field inducing a current in the workpiece; and generating at least a DC magnetic field controlling a magnetic permeability of the workpiece, wherein the DC magnetic field is generated by at least one superconducting DC coil.
  • the method may comprise generating the at least one AC magnetic field by using at least one AC coil. Further, the method may comprise arranging the at least one AC coil between the at least one superconducting DC coil and the workpiece. In an embodiment, the method comprises positioning the at least one AC coil adjacent to the workpiece, wherein at least one side of the workpiece is left free for loading and unloading of the workpiece. A magnitude of the DC magnetic field can be varied by varying a current in the at least one superconducting DC coil. Further, the method may comprise guiding the DC magnetic field generated by the at least one superconducting DC coil by using at least one yoke made of magnetic material. Protecting the at least one superconducting DC coil from AC magnetic fields may be performed by using at least one electrically conducting shield.
  • superconducting coils are used to produce a DC magnetic field fully or partly saturating the magnetic workpiece.
  • the superconducting coils may be located at a certain distance from the workpiece allowing for one or more AC induction coils to be located at any position adjacent to the workpiece and to accomplish fast loading and unloading of the workpiece.
  • the DC magnetic field applied may be very high, e.g. 1.5-4 T, significantly higher than what can be achieved with permanent magnets or copper coils with or without iron yokes.
  • the superconducting coils when cooled down below their critical temperature, carry DC currents practically loss free, and thereby do not significantly influence the energy efficiency of the process, as any other coil material would.
  • Figure 1 illustrates an apparatus for induction heating of a workpiece comprising a magnetic material, where a DC magnetic field is generated by a current in a superconductor DC coil, and an AC magnetic field is generated by separate AC coils according to an embodiment of the present invention
  • Figure 2 illustrates an apparatus for induction heating of a workpiece comprising a magnetic material, where the superconducting DC coil is arranged surrounding the workpiece according to an embodiment of the present invention
  • Figure 3 shows a cross-section view of the embodiment from Figure 2, seen perpendicular to the view in Figure 2;
  • Figure 4 illustrates an example embodiment for loading and unloading the workpiece to or from an induction heating device according to an embodiment of the present invention
  • Figure 5 illustrates an embodiment of the induction heating apparatus from Figure
  • Figure 6 illustrates the induction heating apparatus from Figure 2 where an electrically conducting shield is arranged between the AC coils and the
  • Figure 7 illustrates an embodiment of the present invention where a compensating coil is arranged outside each of the superconducting DC coils.
  • Figure 8 shows an example embodiment where a chain is heat treated by an induction heating apparatus according to the present invention in a continuous process.
  • Figure 1 shows an example embodiment of an inventiveapparatus for induction heating of a workpiece 30.
  • the workpiece comprises at least one magnetic material.
  • the workpiece 30 is heatable by a current induced by an applied AC (alternating current) magnetic field 2.
  • At least one superconducting DC (direct current) coil 10 is adapted for generating at least a DC magnetic field controlling a magnetic permeability of the workpiece 30.
  • the workpiece is in the form of a cylindrical workpiece 30. There is a cylindrical symmetry around the dashed- dotted line.
  • a DC magnetic field 1 is generated by a current in a superconducting DC coil 10 arranged concentrically around the workpiece 30.
  • an AC coil 20 for induction heating of the workpiece 30 is provided by an AC coil 20 arranged between the workpiece 30 and the superconducting DC coil 10.
  • the AC coil 20 may be made of copper.
  • the superconducting DC coil 10 generates a static magnetic field 1 , which fully or partly saturates the workpiece 30.
  • An AC coil 20 generates the time-varying magnetic field 2, which induces currents and generates heat in the workpiece 30.
  • the DC magnetic field 1 is generated by a current in a superconductor DC coil 10, and the AC magnetic field 2 is generated by separate non-superconducting coils 20.
  • a magnitude of the DC magnetic field is variable by varying the current in the at least one superconducting DC coil.
  • the AC coils 20 are located between the workpiece 30 and the superconducting DC coil 10. This arrangement of the AC coils 20 results in that one or two sides of the workpiece 30 are made accessible for handling of the workpiece 30. Handling of the workpiece 30 may be performed with a mechanical handling system accounting for the magnetic forces on the workpiece 30.
  • the at least one AC coil may be positioned adjacent to the workpiece, wherein at least one side of the workpiece is left free for loading and unloading of the workpiece.
  • the superconducting DC coil 10 has the inherent capability of applying a high DC magnetic field strength, location at a distance of the superconducting DC coil 10 from the workpiece 30 is enabled. This distance may be from a few centimeters from the workpiece 30 and up to about one meter from the workpiece 30.
  • the superconducting DC coil(s) are cooled.
  • superconducting DC coil(s) may be inside a cryostat (not shown in the Figures).
  • the superconducting DC coil(s) are practically loss-free, and the losses are limited to heat in-leaks to the cooled DC superconducting coil(s) and losses in the current leads connections to the superconducting DC coil(s).
  • the other parts of the apparatus for induction heating, apart from the superconducting DC coil(s), are arranged at the ambient temperature of the surroundings.
  • the DC magnetic field 1 provided by the superconducting DC coil 10 may be applied simultaneously to the AC magnetic field 2 generated by the AC induction coil 20.
  • the superconducting DC coil 10 may also be energized before or during the induction heating process.
  • the superconducting coil(s) 10 may also be energized throughout the entire induction heating process. Embodiments where the superconducting coil(s) 10 are energized in the initial heating process or at specific times may also be envisaged.
  • the DC magnetic field strength produced by the superconducting coil(s) 10 may also be varied during the heating sequence. Many materials have relative permeability values of 1000 or higher, which are decreased towards 1 as the material becomes saturated by the DC magnetic field 1.
  • the skin depth (and heating depth) can be increased by a factor of 30, or more precisely, ⁇ , as the magnetic material becomes saturated.
  • the power input to the workpiece 30 can be significantly increased without generating excessive heat at the surface which otherwise could result in temperatures above temperature limits or even to boiling of the surface.
  • the so-called soaking time i.e. the time needed for the temperature in the workpiece 30 to level out by heat conduction, can be decreased.
  • the frequency of the AC magnetic field 2 may typically be a mains frequency of the power network which is 50 or 60 Hz.
  • the frequency of the AC magnetic field 2 may however vary for different materials and shapes of the workpiece 30. E.g. for relatively thin workpieces, which is typically below about a thickness of 30 mm for steel, it may be advantageous to increase the frequency up to the kilohertz range. For steel a relatively thin workpiece is typically between 20 - 50 mm.
  • the workpiece to be heated may take any form including a billet shape, a slab, or a chain.
  • the magnetic field produced by the DC superconducting coil 10 should be variable up to the field necessary to fully saturate the workpiece 30.
  • steel that is well above 1 T, typically 1 -3 T a field practically not attainable with permanent magnets or with copper coils over the volume and/or volumes needed.
  • the DC magnetic field applied may be very high, e.g. 1.5-4 T, significantly higher than what can be achieved with permanent magnets or copper coils with or without iron yokes.
  • the AC magnetic field 2 is oriented in the same direction as the DC field 1 , the DC field 1 needs to be even higher, typically about 0.5 T higher, to saturate the workpiece 30 during the entire AC power cycle.
  • the heating time when compared to conventional oil or gas fired furnaces, can be decreased with about a factor of two, i.e. from more than 2 hours to about one hour.
  • the energy efficiency can with the present invention be increased to about 80% compared to about 40% for traditional heating.
  • the invention also enables the possibility to use renewable energy sources, as the invention is based on electric energy supplied to the AC and DC coils.
  • the invention also reduces oxide scales on the surface of the workpiece as compared with conventional oil or gas fired furnaces.
  • the invention applies to heating processes starting at a temperature below the Curie temperature and may or may not pass the Curie temperature during the heating process. As a non-limiting example only, for iron the Curie temperature is around 770 °C.
  • the invention applies to heating of workpieces comprising a magnetic material.
  • the invention provides efficient and fast heating of magnetic materials, as the DC high magnetic field strength applied by the superconducting coil increases the skin depth and thus the heating depth of the magnetic material.
  • the increase of the skin depth results in faster and deeper induction heating of the magnetic material by the applied AC magnetic field. This is done while allowing for optimization of the AC induction coil(s) and the mechanical workpiece handling system.
  • the workpiece may also be adjusted in space during the heating process to optimize the heating process, particularly to obtain the desired temperature profile and fast heating. This means that e.g. one part of the workpiece can be heated during 30 seconds, another part of the workpiece may be heated during the next 30 seconds, or continuous heating can be performed on a long workpiece.
  • the DC superconducting coil(s) itself is practically loss-free, and the losses are limited to heat in-leaks to the cooled DC superconducting coil(s) and losses in the current leads connecting the superconducting coil(s), which may be inside a cryostat, with the surroundings at ambient temperature.
  • the electric circuit can be controlled in a wide range. Every heating sequence has an optimal value for the relative magnetic permeability, considering e.g. heating time and energy efficiency.
  • the relative magnetic permeability can, due to the high attainable DC magnetic fields produced by the superconducting coil, be controlled between practically unity and the relative permeability at no DC magnetic field for a wide range of materials.
  • the orientation of the DC and AC magnetic fields may be arbitrary in respect to each other.
  • Figure 2 shows an example embodiment of the invention for induction heating of a workpiece in the form of a slab 31.
  • the superconducting DC coil 11 is arranged surrounding the workpiece 31 forming a ring shape DC coil 11.
  • the geometry extends into the paper.
  • the DC current in the superconducting DC ring 11 flows in the plane of the paper and generates a DC magnetic field, which saturates the slab 31.
  • the currents in the AC coils 21 flow perpendicular to the plane of the paper and generate an AC magnetic field which induces currents in the workpiece 32
  • Figure 3 shows a cross-section view of the same embodiment as in Figure 2, seen perpendicular to the view in Figure 2.
  • the two AC coils 21 located close to the slab (workpiece) 31 to be heated.
  • the two AC coils 21 are located on opposite sides of the workpiece 31.
  • the ring-formed superconducting DC coil 11 is located further away.
  • the two AC coils 21 are located between the workpiece 31 and the superconducting DC coil 11.
  • the arrangement of the AC coils 21 leaves at least one side of the workpiece 31 accessible for handling of the workpiece 31 by a handling system.
  • Figure 4 shows an example embodiment for loading and unloading the workpiece 31 to or from the induction heating device.
  • the workpiece 31 is in the form a slab.
  • the induction heating device is provided with a ring shaped superconducting DC coil 11 and two AC coils 21 as explained above for Figure 3.
  • the arrangement of the AC coils 21 and the superconducting DC coils 11 at a distance on the outside of the AC coils 21 enables easy arrangement of the slab 31 in the induction heating device, as the slab 31 may be easily inserted between the AC coils 21.
  • Figure 5 shows an embodiment of the induction heating apparatus from Figure 1 where an iron yoke 3 have been arranged surrounding and enclosing the superconducting DC coil 10.
  • the iron yoke 3 is used to guide the DC magnetic field 4 generated by the superconducting DC coil 10.
  • the iron yoke 3 is made of magnetic material.
  • the guiding of the DC magnetic field lines by the iron yoke 3 is illustrated in Figure 5.
  • a cylindrical workpiece 30 is heated by the AC magnetic field 2 generated by the AC coil 20 placed close to the workpiece 30.
  • the figure is symmetric around the dashed-dotted line.
  • Figure 6 shows the embodiment of the induction heating apparatus from Figure 2 where an electrically conducting shield 5 is arranged between the AC coils 21 and the superconducting DC coil 11 in order to suppress AC magnetic fields from the AC coil 21 to the DC superconducting coil 11.
  • the electrically conducting shield 5 is typically a copper plate.
  • the shield 5 may be an integrated part of a cryostat surrounding the superconducting DC coil 11.
  • the superconducting DC coil 11 is located at a distance from the workpiece 31 to allow space for the AC coil 21 and the workpiece handling system. This distance may be from a few centimeters from the workpiece 31 and up to about one meter from the workpiece 31.
  • the large DC magnetic field provided by the at least one superconducting DC coil 11 may extend outside the heating area and create unwanted DC magnetic fields a few meters from the heating area. These unwanted DC magnetic fields may be actively suppressed by compensating coils 6 fully or partly cancelling the magnetic field at the area for e.g. machine operators.
  • Figure 7 shows an example embodiment of the induction heating apparatus from Figure 3, where such compensating coils 6 are used to reduce the DC magnetic field from the superconducting DC coil 11 outside the operation area of the induction heating apparatus.
  • two compensating coils 6 are arranged outside the superconducting DC coil 11 to suppress the magnetic field from the
  • FIG. 7 is a cross-section view as in Figure 3.
  • Figure 8 shows an example embodiment where a workpiece comprising a magnetic material in the form of a chain 7 is heat treated by an induction heating apparatus according to the present invention in a continuous process.
  • the arrangement of the AC heating coil 22 and the DC superconducting coil 12 is cylindricaliy symmetric around the center of the chain 7.
  • the AC coil 22 generates the AC magnetic field, which results in induction currents and heat generation in the chain 7.
  • the DC superconducting coils 12 generate a DC magnetic field magnetically saturating the chain 7 fully or partially.
  • the chain 7 is moved vertically, and leaves the heating zone at the desired temperature.
  • the use of the superconducting DC coil 12 arranged at a distance from the chain 7 and the AC coils 22 provides space around the chain 7 and enables the possibility of the continuous movement of the chain 7 through the heating area.
  • the use of DC superconducting coils 12 enables fast through heating of the chain 7, in turn enabling performance of the continuous process with induction heating.
  • the throughput becomes higher than in oil and gas fired furnaces, since heat is deposited within the chain 7 by the induction currents.

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

Abstract

L'invention porte sur un appareil et sur un procédé pour le chauffage par induction d'une pièce à travailler, la pièce à travailler comprenant au moins un matériau magnétique pouvant être chauffé par un courant induit par un champ magnétique CA appliqué, lequel appareil comprend au moins un enroulement CC supraconducteur agissant de façon à générer au moins un champ magnétique CC régulant une perméabilité magnétique de la pièce à travailler.
PCT/NO2013/050213 2012-12-04 2013-12-03 Appareil et procédé pour chauffage par induction de matériaux magnétiques WO2014088423A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201261733181P 2012-12-04 2012-12-04
US61/733,181 2012-12-04

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WO2014088423A1 true WO2014088423A1 (fr) 2014-06-12

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015094482A1 (fr) * 2013-12-20 2015-06-25 Ajax Tocco Magnethermic Corporation Saturation périphérique cc de bande chauffante à flux transversal
WO2018055150A1 (fr) * 2016-09-26 2018-03-29 Nanoscale Biomagnetics S.L. Dispositif de génération d'un champ magnétique
IT201700031443A1 (it) * 2017-03-22 2018-09-22 Univ Bologna Alma Mater Studiorum Apparato e metodo di riscaldamento ad induzione
WO2021102861A1 (fr) * 2019-11-26 2021-06-03 江西联创光电超导应用有限公司 Procédé de chauffage d'ébauche conductrice et appareil
WO2023211718A1 (fr) * 2022-04-25 2023-11-02 Ajax Tocco Magnethermic Corporation Application de traitement thermique par induction magnétiquement améliorée

Citations (9)

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US2836694A (en) 1954-05-25 1958-05-27 Westinghouse Electric Corp Induction heating unit
US6429765B1 (en) 1996-05-23 2002-08-06 Abb Ab Controllable inductor
DE202007000870U1 (de) * 2006-10-06 2007-04-05 E. Zoller GmbH & Co. KG Einstell- und Messgeräte Werkzeugeinspannvorrichtung
DE102007012067A1 (de) * 2007-03-13 2007-11-15 Daimlerchrysler Ag Vorrichtung zur induktiven Wärmebehandlung
US7339145B2 (en) 2003-01-24 2008-03-04 Sintef Energiforskning As Apparatus and a method for induction heating of pieces of electrically conducting and non-magnetic material
US7534980B2 (en) * 2006-03-30 2009-05-19 Ut-Battelle, Llc High magnetic field ohmically decoupled non-contact technology
US8027135B2 (en) 2008-04-03 2011-09-27 Zenergy Power Pty Ltd. Fault current limiter
EP2441849A2 (fr) * 2010-10-14 2012-04-18 Eaton Corporation Traitement et appareil thermomagnétique sélectif de profondeur de pénétration de trempe
US8169756B2 (en) 2006-03-29 2012-05-01 Rolls-Royce Plc Fault current limiting

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Publication number Priority date Publication date Assignee Title
US2836694A (en) 1954-05-25 1958-05-27 Westinghouse Electric Corp Induction heating unit
US6429765B1 (en) 1996-05-23 2002-08-06 Abb Ab Controllable inductor
US7339145B2 (en) 2003-01-24 2008-03-04 Sintef Energiforskning As Apparatus and a method for induction heating of pieces of electrically conducting and non-magnetic material
US8169756B2 (en) 2006-03-29 2012-05-01 Rolls-Royce Plc Fault current limiting
US7534980B2 (en) * 2006-03-30 2009-05-19 Ut-Battelle, Llc High magnetic field ohmically decoupled non-contact technology
DE202007000870U1 (de) * 2006-10-06 2007-04-05 E. Zoller GmbH & Co. KG Einstell- und Messgeräte Werkzeugeinspannvorrichtung
DE102007012067A1 (de) * 2007-03-13 2007-11-15 Daimlerchrysler Ag Vorrichtung zur induktiven Wärmebehandlung
US8027135B2 (en) 2008-04-03 2011-09-27 Zenergy Power Pty Ltd. Fault current limiter
EP2441849A2 (fr) * 2010-10-14 2012-04-18 Eaton Corporation Traitement et appareil thermomagnétique sélectif de profondeur de pénétration de trempe

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Title
M. RUNDE; N. MAGNUSSON; C. FUIBIER; C. BÜHRER: "Commercial Induction Heaters with High-Temperature Superconductor Coils", IEEE TRANS. APPL. SUPERCOND., vol. 21, no. 3, 2011, pages 1379 - 1383, XP011324941, DOI: doi:10.1109/TASC.2010.2088095

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015094482A1 (fr) * 2013-12-20 2015-06-25 Ajax Tocco Magnethermic Corporation Saturation périphérique cc de bande chauffante à flux transversal
US9462641B2 (en) 2013-12-20 2016-10-04 Ajax Tocco Magnethermic Corporation Transverse flux strip heating with DC edge saturation
WO2018055150A1 (fr) * 2016-09-26 2018-03-29 Nanoscale Biomagnetics S.L. Dispositif de génération d'un champ magnétique
IT201700031443A1 (it) * 2017-03-22 2018-09-22 Univ Bologna Alma Mater Studiorum Apparato e metodo di riscaldamento ad induzione
WO2018172929A1 (fr) * 2017-03-22 2018-09-27 Alma Mater Studiorum - Universita' Di Bologna Appareil et procédé de chauffage par induction
WO2021102861A1 (fr) * 2019-11-26 2021-06-03 江西联创光电超导应用有限公司 Procédé de chauffage d'ébauche conductrice et appareil
WO2023211718A1 (fr) * 2022-04-25 2023-11-02 Ajax Tocco Magnethermic Corporation Application de traitement thermique par induction magnétiquement améliorée

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