EP2491760B1 - Procede de chauffage par induction mis en oeuvre dans un dispositif comprenant des inducteurs couples magnetiquement - Google Patents

Procede de chauffage par induction mis en oeuvre dans un dispositif comprenant des inducteurs couples magnetiquement Download PDF

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Publication number
EP2491760B1
EP2491760B1 EP10785478.8A EP10785478A EP2491760B1 EP 2491760 B1 EP2491760 B1 EP 2491760B1 EP 10785478 A EP10785478 A EP 10785478A EP 2491760 B1 EP2491760 B1 EP 2491760B1
Authority
EP
European Patent Office
Prior art keywords
ref
mes
inductors
current
currents
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.)
Not-in-force
Application number
EP10785478.8A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2491760A1 (fr
Inventor
Olivier Pateau
Yves Neau
Yvan Lefevre
Philippe Ladoux
Pascal Maussion
Gilbert Manot
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.)
Electricite de France SA
Centre National de la Recherche Scientifique CNRS
Institut National Polytechnique de Toulouse INPT
Original Assignee
Electricite de France SA
Centre National de la Recherche Scientifique CNRS
Institut National Polytechnique de Toulouse INPT
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.)
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Application filed by Electricite de France SA, Centre National de la Recherche Scientifique CNRS, Institut National Polytechnique de Toulouse INPT filed Critical Electricite de France SA
Priority to SI201030916T priority Critical patent/SI2491760T1/sl
Priority to PL10785478T priority patent/PL2491760T3/pl
Publication of EP2491760A1 publication Critical patent/EP2491760A1/fr
Application granted granted Critical
Publication of EP2491760B1 publication Critical patent/EP2491760B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/101—Induction heating apparatus, other than furnaces, for specific applications for local heating of metal pieces
    • H05B6/103—Induction heating apparatus, other than furnaces, for specific applications for local heating of metal pieces multiple metal pieces successively being moved close to the inductor
    • H05B6/104—Induction heating apparatus, other than furnaces, for specific applications for local heating of metal pieces multiple metal pieces successively being moved close to the inductor metal pieces being elongated like wires or bands
    • 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
    • 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
    • H05B6/06—Control, e.g. of temperature, of power
    • H05B6/08—Control, e.g. of temperature, of power using compensating or balancing arrangements
    • 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
    • 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

Definitions

  • the present invention relates to a method of induction heating implemented in a heating device of a metal part such as a metal sheet or a bar, the device comprising magnetically coupled inductors.
  • magnetic coupling is meant that the inductors produce between them mutual inductions.
  • the patent application WO 00/28787 A1 discloses a system for heating a tubular metal part by induction coils fed via a dimmer type interrupt circuit connected to an inverter type power source.
  • a control circuit makes it possible to vary the duration of the power injected by the power source to each coil in order to heat different different zones of the metal part differently in view of a desired temperature profile.
  • the injection of power into a coil is therefore done in "all or nothing", that is to say, it can be prevented on a cycle corresponding to several periods of the This system nevertheless has drawbacks, and in particular it makes it possible to control only the average power produced by each coil without being able to precisely control the temperature profile generated by the coils in the heated room.
  • connection of the coils and the inverters must be to a certain extent defined according to the load and the temperature profile to be achieved.
  • this document does not mention the magnetic couplings between the circuits nor how to get rid of them or to take them into account.
  • the present invention aims to solve these disadvantages and to provide a heating method taking into account the many couplings, on the one hand between the different inductors and on the other hand between the inductors and the part to be heated, to allow control with a good accuracy the temperature profile generated by the inductors.
  • the invention aims in particular to be able to adjust the heating to different desired temperature profiles in real time, by acting on the control of inverters supplying the inductors and without the need to adjust the structure of the inductors.
  • the exemplary heating device relates to a non-magnetic metal disk configuration heated by transverse flux using three pairs of twin coils, which has the advantage of keeping the axisymmetric aspect of the problem.
  • each coil placed on one side of the disk is connected in series with its twin coil on the other side to form a single inductor. In this way, the system is rotational invariant.
  • the electromagnetic materials of the system have a constant and unitary permeability.
  • Each inductor is powered by a UPS of its own type (voltage inverter) or parallel type (inverter current).
  • N 3.
  • the impedance matrix must be complete to account for all coupling effects.
  • the determination of this matrix can be complex, several analytical or numerical means, or measurements in line and continuous injection of particular signals, can be implemented.
  • the control of the temperature profile of the heated part must be carried out not only by controlling the amplitudes of the currents in the inductors but also by controlling the phase shifts of these currents relative to one another, which implies that each inverter is controlled so as to be able to vary the amplitude and the phase of the current flowing through the corresponding inductor.
  • the system is invariant along the axis of revolution of the sheet metal disk and in the thickness of the sheet. We therefore take into account only one dimension of the disc, namely the radial direction of the considered area of the disc.
  • the image function of the power density D p ( r, x ) is determined by the relationships of equations (3) and (4) above. It is furthermore advantageous to optimize by calculation the vector of unknowns x .
  • the optimization problem consists of calculating an optimized vector x making it possible to minimize the difference between the image function of the power density and a reference power density function Dp ref ( r ) which corresponds to a reference power density profile that we try to inject into the metal disc.
  • This reference power density function takes for example a constant value if we are looking for a temperature homogeneity on the disk. It is however possible to have a non-constant function in order to obtain particular heating profiles. With the equipment of the figure 1 the applicant has carried out tests with different reference power density functions corresponding for example to sinusoidal or triangular profiles in the radial direction of the disk, and the results are very satisfactory.
  • This allows us to eliminate among other things outliers or that have no physical reality.
  • This method of resolution can easily be enlarged to take into account several dimensions of a disk, for example three if in addition to the radius one takes into account the angular position and the thickness of material of the zone considered, while taking into account also the equality of the reactive compensation required at the terminals of each coil so that the three oscillating circuits oscillate at very similar frequencies. We would thus pass from a vector to five unknowns to a vector with eighteen unknowns, without changing the physical system.
  • FIG 8 is schematically shown a first embodiment of an induction heating device according to the invention, wherein the supply 1 of the inverters is a DC source.
  • the heating device comprises inductors Ind1, Ind2,... Indp, magnetically coupled, each inductor being supplied by a current inverter O1, O2,..., Op, which is specific to it and is associated with a capacitor C 1. , C 2 , ..., Cp, to form an oscillating circuit OC1, OC2, ..., OCp.
  • the inverters of current are put in series with the power supply 1.
  • Each inverter generally comprises bidirectional electronic switches, and is controlled by a control unit also called modulator M1, M2, ..., Mp.
  • Each modulator designs control commands for the switches in the form of pulses, and the offset in time of these commands makes it possible to vary the amplitude A 1 , A 2 ,..., A p , and the phase ⁇ 1.
  • the variation of the amplitude of the current output current of each inverter is effected by introducing an offset angle on the signal generated by the modulator controlling the inverter.
  • the offset angles on the other inverters can be introduced with respect to a control angle on the reference inverter.
  • the control on the reference inverter can be carried out for example with a duty cycle equal to 2/3, that is to say a control angle of 30 °.
  • the oscillating circuits have at least approximately the same resonance frequency, which maximizes the efficiency of the induction since the inductors work substantially at this frequency, and also reduces the losses in the inverters.
  • the periodic control signals of the inverters generated by the modulators therefore have substantially the same frequency.
  • the offset can either be late or in advance compared to the control signal of the inverter of another inductor taken as a reference.
  • Means for determining the amplitude and phase parameters of currents I 1 , I 2 ,..., I p , inductors, not shown in the figure, are provided to supply these parameters to comparator units ⁇ 1 , ⁇ 2 , ..., ⁇ p .
  • These determination means may consist for example of current transformers each arranged in series with an inductor, but other means are possible. One could for example measure the active current supplied by the inverter to the oscillating circuit, and calculate the current in the inductor using the parameters of inductance and capacitance.
  • the effective temperature profile is for example determined continuously during the heating and is regularly compared to a temperature profile of reference ⁇ 1 ref , ⁇ 2 ref , ..., ⁇ n ref , corresponding to the desired final heating profile for the part and previously entered into a memory.
  • This comparison is performed by a comparator 2, which can integrate said memory.
  • the result is processed by a calculator which, from an equation deduced from the equation of heat and possibly simplified as equation (2) above, calculates the reference power density profile Dp ref 1 , Dp ref 2 , ..., Dp ref n that the heater must inject into the room to reach the reference temperature profile.
  • the computer may consist of a memory in which is entered an array of pre-calculated reference power density profiles corresponding to different actual temperature profiles for one or more room configurations and one or more reference power density profiles.
  • a calculator establishes the target currents to be delivered by the inverters so that the currents of the inductors reach appropriate target values I 1 ref , I 2 ref , ..., I p ref , to inject into the part the power density profile of the reference.
  • This computation uses the matrix of impedances Z with the vectorial functions f k and preferably the vector of the capacities of the oscillating circuits, defined previously.
  • the comparator units ⁇ 1 , ⁇ 2 , ..., ⁇ p compare the measured or calculated current parameters I 1 mes , I 2 mes , ..., I p mes , inductors to the target values I 1 ref , I 2 ref , ..., I p ref, and determine the currents deviations ⁇ I 1 corr , ⁇ I 2 corr , ..., ⁇ I p corr to be corrected, also called correction currents.
  • phase shifts are used as real-time adjustment parameters of the power density to be injected into the heated room, which is made possible by taking into account the complete impedance matrix as explained in what follows. above. In other words, phase shifts are used as control parameters of the temperature profile.
  • the modified impedance matrix Z mod ( ⁇ ) for at least one increased value ⁇ mod of the mean temperature ⁇ , and the modified impedance matrix is used to recalculate the target currents.
  • the calculation of the target currents can be carried out each time the measured average temperature ⁇ reaches substantially a new increased value ⁇ mod among a series of predetermined values.
  • the current inverter supplying the inductor of lower impedance for example the coil Ind1 in the example of the figure 1
  • the reference inverter since the current in this inductor, larger than that in the other inductors, is preferably taken as a phase reference.
  • the current inverter having the highest current, or the voltage inverter having the highest voltage in the case where the power supply 1 of the inverters is a voltage source as shown in FIG. figure 9 can be taken as reference inverter.
  • the reference inverter can be advantageously adjusted with a duty cycle of 2/3, ie it is controlled so as to generate a square wave of 120 ° ON and 60 ° OFF per half-period. .
  • This aims to cancel the harmonic of order 3 and its multiples in order to reduce the harmonic disturbances created by this inverter on these neighbors. It is understood that the duty cycle of the reference inverter is not necessarily set to 2/3. For example, a command in full wave may be preferred in some cases.
  • the rms value of the current in the reference inverter can be set by action on the DC supply 1 current or voltage. This has the advantage of having a vector of unknowns (see previous relation 1) in which the phase of the current in the inductor Ind1 has been eliminated, which simplifies obtaining the optimized vector x as in the example described previously. It is understood that one can alternatively adjust the rms value of the current in the reference inverter by introducing offset angles on the control of this inverter. On the figure 8 the current I 1 being taken as a phase reference, it is advantageous that the corresponding comparator unit ⁇ 1 receives the parameters of the current I c mes delivered by the continuous supply 1.
  • the processing unit CORR 1 associated will be adapted to generate control instructions sent to the power supply 1 via a control modulator M'1, so as to modify the current delivered by the inverter O1 to the oscillating circuit OC1, which makes it possible to control the amplitude of the this current and therefore to change the amplitude of the current I 1 in inductor Ind1.
  • the target currents as well as the currents of the inductors measured or calculated are current vectors, therefore one takes into account not only the amplitude but also the phase.
  • step (c) is carried out at least once to reduce the differences in currents to be corrected, and then steps (a) are repeated at least once, (b) and (c) by updating the actual temperature profile by temperature measurements in different heated areas of the room.
  • FIG 9 is schematically shown a second embodiment of an induction heating device according to the invention, wherein the supply 1 of the inverters is a DC voltage source.
  • the heating device is similar to that of the first embodiment of the figure 8 , but the current inverters are paralleled with the voltage source.
  • This embodiment has certain advantages, in particular that of reducing conduction losses in the inverters.
  • the current parameter I c calc representative of the current delivered by the power supply 1 to the inverter O1 must be calculated from the supply voltage by means of an impedance matrix Z '.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • General Induction Heating (AREA)
EP10785478.8A 2009-10-19 2010-10-19 Procede de chauffage par induction mis en oeuvre dans un dispositif comprenant des inducteurs couples magnetiquement Not-in-force EP2491760B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
SI201030916T SI2491760T1 (sl) 2009-10-19 2010-10-19 Proces za indukcijsko gretje, ki ga uporablja naprava, ki vsebuje magnetno povezane induktorje
PL10785478T PL2491760T3 (pl) 2009-10-19 2010-10-19 Sposób ogrzewania indukcyjnego zastosowany w urządzeniu zawierającym wzbudniki sprzężone magnetycznie

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0957321A FR2951606B1 (fr) 2009-10-19 2009-10-19 Procede de chauffage par induction mis en oeuvre dans un dispositif comprenant des inducteurs couples magnetiquement
PCT/FR2010/052216 WO2011048316A1 (fr) 2009-10-19 2010-10-19 Procede de chauffage par induction mis en oeuvre dans un dispositif comprenant des inducteurs couples magnetiquement

Publications (2)

Publication Number Publication Date
EP2491760A1 EP2491760A1 (fr) 2012-08-29
EP2491760B1 true EP2491760B1 (fr) 2015-01-21

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EP10785478.8A Not-in-force EP2491760B1 (fr) 2009-10-19 2010-10-19 Procede de chauffage par induction mis en oeuvre dans un dispositif comprenant des inducteurs couples magnetiquement

Country Status (15)

Country Link
US (1) US9398643B2 (ko)
EP (1) EP2491760B1 (ko)
JP (1) JP5553904B2 (ko)
KR (1) KR101480984B1 (ko)
CN (1) CN102668692B (ko)
AU (1) AU2010309618B2 (ko)
BR (1) BR112012009125A2 (ko)
CA (1) CA2778379C (ko)
ES (1) ES2535092T3 (ko)
FR (1) FR2951606B1 (ko)
IN (1) IN2012DN03410A (ko)
PL (1) PL2491760T3 (ko)
RU (1) RU2525851C2 (ko)
SI (1) SI2491760T1 (ko)
WO (1) WO2011048316A1 (ko)

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JP6071653B2 (ja) * 2013-03-06 2017-02-01 トクデン株式会社 誘導加熱装置
DE102013008068A1 (de) * 2013-05-10 2014-11-13 Oerlikon Textile Gmbh & Co. Kg Verfahren und Vorrichtung zur Bestimmung einer Oberflächentemperatur eines induktiv beheizten Walzenmantels
FR3046018B1 (fr) * 2015-12-18 2018-01-26 Electricite De France Procede d'optimisation de chauffage par induction
EP3446543B1 (en) * 2016-04-18 2023-05-10 Alps South Europe s.r.o Induction heater and dispenser
US11877375B2 (en) 2016-07-06 2024-01-16 AMF Lifesystems, LLC Generating strong magnetic fields at low radio frequencies in larger volumes
CN108920858B (zh) * 2018-07-19 2024-01-23 成都巴莫科技有限责任公司 一种预测辊道窑加热棒使用寿命的方法
CN110208794B (zh) * 2019-04-30 2021-01-12 北京敏视达雷达有限公司 一种差分传播相移修正电路及双偏振雷达
DE102020105222A1 (de) 2020-02-27 2021-09-02 BST Induktion GmbH Induktionsanlage; Verfahren zum Betreiben einer Induktionsanlage
JP1682813S (ja) * 2020-08-11 2021-04-05 整流板
JP1682810S (ja) * 2020-08-11 2023-03-28 整流板
JP1682811S (ja) * 2020-08-11 2021-04-05 整流板
JP1682812S (ja) * 2020-08-11 2021-04-05 整流板

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Also Published As

Publication number Publication date
FR2951606B1 (fr) 2012-01-06
KR20120083475A (ko) 2012-07-25
JP5553904B2 (ja) 2014-07-23
CA2778379C (fr) 2017-09-05
ES2535092T3 (es) 2015-05-05
BR112012009125A2 (pt) 2017-06-20
AU2010309618A1 (en) 2012-05-17
KR101480984B1 (ko) 2015-01-14
RU2012120692A (ru) 2013-11-27
IN2012DN03410A (ko) 2015-10-23
CN102668692B (zh) 2014-10-29
EP2491760A1 (fr) 2012-08-29
WO2011048316A1 (fr) 2011-04-28
RU2525851C2 (ru) 2014-08-20
FR2951606A1 (fr) 2011-04-22
US9398643B2 (en) 2016-07-19
CA2778379A1 (fr) 2011-04-28
US20120199579A1 (en) 2012-08-09
JP2013508908A (ja) 2013-03-07
SI2491760T1 (sl) 2015-07-31
CN102668692A (zh) 2012-09-12
AU2010309618B2 (en) 2014-03-20
PL2491760T3 (pl) 2015-07-31

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