EP0482635A2 - Elektromagnetischer Induktor mit Ferritkern zum Erwärmen von elektrischleitendem Material - Google Patents

Elektromagnetischer Induktor mit Ferritkern zum Erwärmen von elektrischleitendem Material Download PDF

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Publication number
EP0482635A2
EP0482635A2 EP91118152A EP91118152A EP0482635A2 EP 0482635 A2 EP0482635 A2 EP 0482635A2 EP 91118152 A EP91118152 A EP 91118152A EP 91118152 A EP91118152 A EP 91118152A EP 0482635 A2 EP0482635 A2 EP 0482635A2
Authority
EP
European Patent Office
Prior art keywords
core
induction
coil
enclosure
tubes
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Withdrawn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
EP91118152A
Other languages
English (en)
French (fr)
Other versions
EP0482635A3 (en
Inventor
Jean-Luc Dion
Rémy Simard
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.)
Hydro Quebec
Original Assignee
Hydro Quebec
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 Hydro Quebec filed Critical Hydro Quebec
Publication of EP0482635A2 publication Critical patent/EP0482635A2/de
Publication of EP0482635A3 publication Critical patent/EP0482635A3/fr
Withdrawn legal-status Critical Current

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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
    • H05B6/42—Cooling of coils
    • 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
    • H05B6/14—Tools, e.g. nozzles, rollers, calenders
    • H05B6/145—Heated rollers
    • 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 present invention relates to an induction heater that uses an open core made of ferric material with a coil of Litz wire through which an excitation current flows to produce a variable magnetic field which is concentrated between the open core poles by means of magnetic flux concentrators made of electrically conductive tubes in close contact with a heat conductive but non-electrically conductive material in order to drain the heat generated in the coil and the core, while a coolant is circulated in the concentrator tubes.
  • US Patent 2,785,263 discloses the use of cores made of ferrite. Such a material has a relatively high magnetic permeability and low conductivity and has been found to be an ideal material for use in induction heating stations.
  • cores made of ferrite.
  • Such a material has a relatively high magnetic permeability and low conductivity and has been found to be an ideal material for use in induction heating stations.
  • other problems have arisen as a result of the use of such cores and, more particularly, in order to saturate the poles so that they contribute as much as possible to the density of flux generated in a part arranged between them, it it is necessary to substantially saturate the entire core, this being very inefficient and resulting at high frequencies, in huge heat losses.
  • US Patent 4,359,620 attempts to solve this new problem by using a core construction which concentrates a magnetic field with high flux density between its two ends which are separated very little and tapered.
  • a periodic voltage is supplied to the core and a capacitor is connected to the excitation core so as to form a resonant circuit which is used for controlling the frequency and the phase of the periodic voltage supplied to the circuit in order to keep it in resonance.
  • the object of the present invention is to develop an improved induction heating device for heating ferromagnetic materials at temperatures rising at least up to 300 ° C., this device overcoming the disadvantages of the prior art mentioned above. -above.
  • Another object of the present invention is to develop an improved induction heating device for heating ferromagnetic materials to temperatures of at least up to 300 ° C, in which the core is made of ferric material and uses a coil of Litz wire, and in which the improvement resides in magnetic flux concentrator tubes which are positioned around the coil at a short distance from the core while a coolant circulates inside the tubes in order to cool the core and the coil.
  • This allows excitation currents to be applied to the coil in a frequency range of 12 to 25 kHz so that the eddy currents in the magnetic field produced can generate 4 to 20 kW of heat in a conductive surface.
  • the temperature, frequency and power values are only illustrative and in no way limitative.
  • the present invention also aims to develop an improved induction heating device as described above and, in addition, in which the core and the coil are positioned in a material which conducts heat but which does not conduct electricity.
  • a material which conducts heat but which does not conduct electricity which is a composite material made of epoxy and powdered copper or aluminum.
  • the present invention also aims to develop an improved induction heat device as described above and in which the core takes the form of an E which forms two opposite poles and a central pole between which a magnetic field is generated, around the central pole, the coil being wound with concentrator tubes being positioned around the coil and near the opposite poles in order to increase the magnetic flux generated between the poles, outside on the surface to be heated .
  • an advantageous embodiment of the invention provides an induction heating device for heating an electrically conductive and mainly ferromagnetic material at temperatures ranging at least up to 300 ° C.
  • the device includes an open core made of ferric material, a coil of Litz wire wrapped around the core, a power source connected to the coil to produce an excitation current in the coil within a range frequency varying between 12 and 25 kHz in order to generate a magnetic field when magnetized.
  • Magnetic flux concentrator tubes made of an electrically conductive material are positioned around the coil and near the core in a heat conductive but non-electrically conductive material.
  • a coolant circulates in the concentrator tubes to cool the core and the coil.
  • An induction zone is defined by the magnetic field generated between the opposite poles of the core and orientable near an electrically conductive surface in order to heat this surface electromagnetically by means of eddy currents generated between the opposite poles of the core and concentrated therebetween by the concentrator tubes.
  • FIG. 1 there is generally shown at 10 an induction heating device according to the present invention which is shown here as being spaced a little apart from the surface of a calendering roller 11 d 'a paper machine so as to heat the ferromagnetic material positioned on the outer surface of the calendering roller.
  • the heater comprises a ferrite core 12 which has the shape of an E providing opposite arms 13 and 13 'and a central leg 14 around which a coil 15 of Litz wire is wound.
  • the coil 15 has terminals 16 to which a controllable power source 17 (see Figure 2) is connected so as to supply an excitation current to the coil in a frequency range from 12 to 25 kHz.
  • the improvement of the induction heating device according to the present invention lies in the contribution of magnetic flux concentrator tubes 18 which are positioned around the coil 15 very close to the core 12.
  • the concentrator tubes 18 are positioned in a conductive material heat but not electrically conductive 19 and are spaced from the core and the coil.
  • One end of the tubes 18 is electrically isolated from the side plates 22a or 22b illustrated in FIG. 1A.
  • the material 19 is a composite of an epoxy or a synthetic resin generally, and of copper or aluminum powder which is positioned in the enclosure 20.
  • the enclosure 20, as illustrated in FIG. 2, is a rectangular enclosure formed from a powdered ceramic material and fiberglass.
  • a layer of aluminum paint 21 is applied to the induction surface of the enclosure which is positioned a short distance from the electromagnetic surface to be heated so as to reduce the heat transfer by external radiation with return to the surface d induction 21 of the enclosure 20.
  • a metal shield 22, 22a, and 22b is also positioned in the enclosure 20 and, as illustrated here, against the upper wall and the two side walls of the latter in order to electromagnetically shield the inductor.
  • a pressurized water supply 23 is used for the circulation of cooling water through the magnetic flux concentrator tubes 18 so as to cool the core and the coil in the enclosure 20 heated by Joule effect on the surface of the tubes and inside the coil, and heat from the surface of the workpiece.
  • This cooling effect allows the application of an excitation current in a high frequency range varying between 12 and 25 kHz, from where the induction heater 10 can generate approximately between 4 and 25 kW of power while the coolant keeps the internal temperature of the enclosure below 60 ° C, these values being non-limiting.
  • the concentrator tubes 18 also concentrate the magnetic field produced between the poles 24 and 14.
  • the inductance of the core also varies between 40 and 125 ⁇ H depending on the dimensions of the core used and the frequency of the selected source, these values being nonlimiting.
  • a typical application of an electromagnetic induction heating device As illustrated here, a plurality of heaters 10 are alternately positioned, offset and side by side along a heating calendering roller 30 of a paper machine (not shown).
  • the heaters 10 are spaced apart from the roller 30 as illustrated in FIG. 4 and are stationary with respect to the roller 30. Their specific spacing and their mutual relationship make it possible to obtain a controlled temperature along the width of the roller.
  • These heaters 10 can also be supplied with electrical power or parallel power in series alignment or individually.
  • FIGS. 3 to 5 relate to an application in the manufacture of paper, it is pointed out that these induction heating stations have a multitude of other applications and they could, for example, be used in other industries for laminating or glazing a sheet-like material.
  • the efficiency of this heating device has also been calculated as being in the order of 95% when calculated by the proportion of useful heat generated relative to the electric power used.
  • the heating devices according to the present invention can generate approximately 250 kW of heat per meter of length of the electrically conductive material used in the construction of the calendering roller.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Induction Heating (AREA)
EP19910118152 1990-10-25 1991-10-24 Electromagnetic inductor with ferrite core for heating electric conducting material Withdrawn EP0482635A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/603,150 US5101086A (en) 1990-10-25 1990-10-25 Electromagnetic inductor with ferrite core for heating electrically conducting material
US603150 1990-10-25

Publications (2)

Publication Number Publication Date
EP0482635A2 true EP0482635A2 (de) 1992-04-29
EP0482635A3 EP0482635A3 (en) 1993-02-03

Family

ID=24414287

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910118152 Withdrawn EP0482635A3 (en) 1990-10-25 1991-10-24 Electromagnetic inductor with ferrite core for heating electric conducting material

Country Status (3)

Country Link
US (1) US5101086A (de)
EP (1) EP0482635A3 (de)
CA (1) CA2093786A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1768462A3 (de) * 2003-07-02 2007-09-26 iTherm Technologies LP Erwärmungssysteme und -verfahren

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EP1768462A3 (de) * 2003-07-02 2007-09-26 iTherm Technologies LP Erwärmungssysteme und -verfahren
US7767941B2 (en) 2003-07-02 2010-08-03 Valery Kagan Inductive heating method utilizing high frequency harmonics and intermittent cooling

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CA2093786A1 (fr) 1992-04-26
US5101086A (en) 1992-03-31
EP0482635A3 (en) 1993-02-03

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