EP2422580A1 - Dispositif de chauffage par inducteur de puissance, inducteur de puissance, et four ainsi équipé - Google Patents
Dispositif de chauffage par inducteur de puissance, inducteur de puissance, et four ainsi équipéInfo
- Publication number
- EP2422580A1 EP2422580A1 EP10719098A EP10719098A EP2422580A1 EP 2422580 A1 EP2422580 A1 EP 2422580A1 EP 10719098 A EP10719098 A EP 10719098A EP 10719098 A EP10719098 A EP 10719098A EP 2422580 A1 EP2422580 A1 EP 2422580A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cable
- inductor
- strands
- fan
- turns
- 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.)
- Granted
Links
- 238000010438 heat treatment Methods 0.000 title claims abstract description 40
- 239000002184 metal Substances 0.000 claims abstract description 17
- 229910052751 metal Inorganic materials 0.000 claims abstract description 17
- 230000006698 induction Effects 0.000 claims abstract description 12
- 239000003990 capacitor Substances 0.000 claims description 49
- 239000004020 conductor Substances 0.000 claims description 21
- 238000001816 cooling Methods 0.000 claims description 15
- 239000012809 cooling fluid Substances 0.000 claims description 10
- 238000013021 overheating Methods 0.000 claims description 7
- 238000003466 welding Methods 0.000 claims description 5
- 230000035515 penetration Effects 0.000 claims description 4
- 230000001939 inductive effect Effects 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 2
- 235000013305 food Nutrition 0.000 claims 1
- 239000012811 non-conductive material Substances 0.000 claims 1
- 235000014347 soups Nutrition 0.000 claims 1
- 239000000835 fiber Substances 0.000 abstract 2
- 238000010586 diagram Methods 0.000 description 8
- 230000004907 flux Effects 0.000 description 5
- 239000011810 insulating material Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000411 inducer Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002966 varnish Substances 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- 101000983970 Conus catus Alpha-conotoxin CIB Proteins 0.000 description 1
- 101000932768 Conus catus Alpha-conotoxin CIC Proteins 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 239000000112 cooling gas Substances 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000002500 effect on skin Effects 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
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
-
- 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
Definitions
- the invention relates to an induction heating device of the kind comprising:
- high frequency is meant a frequency equal to or greater than 5 kilohertz (kHz) and which can reach 1 megahertz (1 MHz) or more.
- power inductor is meant an inductor crossed by a current whose intensity is at least 100 amperes.
- the invention relates in particular, but not exclusively, to induction heating of any electrically conductive product on the run for various applications such as:
- the inductor in the following description, is of the longitudinal flow type, but it can also be of the transverse flow type, in particular for heating non-magnetic parts or of particular geometry.
- EP 0 577 468 proposes an electromagnetic induction heating coil comprising a particular cooling device for the conductors of the coil. This solution is interesting for frequencies below 10 kHz, but the efficiency decreases significantly at higher frequencies.
- WO 2007/141 422 discloses an induction heating device having a high frequency power supply which allows a high power to be transferred by the inductor while reducing the construction difficulties created by the electrical voltages, in particular at the level of the electrical connections. the inductor and capacitors. For such a heating device, it is also desirable to improve the energy efficiency.
- JP 10-50217 A relates to a field different from that of the invention since it is a method of manufacturing a deflector armature to deflect an electron beam in a cathode ray tube.
- Litz wires are provided in two rows to facilitate welding. There is no question of induction heating.
- the object of the invention is, above all, to provide a high frequency induction power heating device in which the losses due to heating of the inductor are reduced.
- EP 1 604 551 proposes a setting in series and parallel of monospires which can be advantageously be used for the connection of turns (mono or multispires) made from cables of Litz.
- an induction heating device comprising:
- the inductor comprises at least one multi-strand cable isolated between them, commonly called Litz cable, and the strands of the cable, at their connecting end. are fan-shaped to be connected in parallel to a metal bar forming a power supply terminal, the diameter of a cable strand being chosen such that it makes it possible to overcome the high frequency eddy current losses generated.
- the neighboring conductors the number of strands or wires in parallel in a cable being sufficiently high to allow the passage of the intensity corresponding to the high power of heating.
- the intensity of the current, for the heating power can reach several hundred to several thousands of amperes.
- the diameter of a strand of the cable may be 0.1 mm for a frequency of 50 kHz.
- the strands of the cable may be surrounded, or not, by an electrically insulating envelope.
- connection of the ends of the strands or cable can be assured by welding on the bar, or other mode of connection such as crimping, or superimposed ends.
- the length of the metal bar is at least five times the diameter of the cable, preferably greater than ten times the diameter of the cable.
- the fan may concern subgroups of strands.
- several parallel fan plies can be provided.
- the plies of fan blades are connected flat against the bar.
- the thickness of the plies or subgroups of strands is less than the penetration depth of the high frequency current in the supply terminal bar.
- Each fan ply of cable strands for the connection preferably has a mean plane passing through or near the geometric axis of the end of the cable.
- the fan is deployed on either side of the extension of the axis of the end of the cable.
- the angle formed between the strands constituting the extreme edges of the fan and the geometric axis of the end of the cable can reach or even exceed 60 °.
- the power supply terminal of a range of strands is connected, on the side opposite the fan, to at least one capacitor frame.
- the average plane of the connection range may be orthogonal to the running direction of the element to be heated; alternatively, this plane can be inclined in this direction.
- the average plane of the fan would be vertical for a band to be heated moving horizontally.
- connection fan In the case of an inductor whose cable is helically wound in several turns (multi-turn inductor), the connection fan can be placed in a plane passing through the axis of the flux.
- the heating device comprises an inductor whose cable is helically wound in several turns (multispire inductor), the number of turns free from any orientation constraints of the fan.
- the inductor comprises one or more turns.
- the turns can be electrically connected in series or in parallel.
- the winding (s) surround the element to be heated, thus taking the form of a profile of the element to be heated, in particular the shape of a frame when the element to be heated is of flat shape or the shape of a circle when the element to be heated is cylindrical, or any shape adapted to the profile of the element to be heated.
- the inductor may be formed of a single cable, or may comprise at least two cables or groups of multi-strand cables insulated from each other, connected to capacitor plates at their ends, forming a parallel oscillating circuit.
- the power supply to maintain the oscillation of the circuit will be placed in parallel with the capacitor or capacitors, or one of the capacitors.
- the power supply can be connected in series, being interposed between the inductor and one of the capacitors directly or through a transformer, the inductor then being mounted in a series oscillating circuit.
- the accompanying drawings only describe the case of the parallel oscillating circuit, but the duality of the series circuit can be envisaged.
- the inductor may comprise four groups of cables forming a quadrilateral surrounding the element to be heated and connected at their ends, forming the vertices of the quadrilateral, to four armatures or groups of capacitor plates.
- the inductor may comprise several turns orthogonal to the geometric axis of the inductor, and juxtaposed according to a stack.
- means for compensating the inductance of the end turns are provided to prevent overheating of these turns.
- These compensation means may comprise additional turns close to the end turn, of increasing diameter, located in a plane orthogonal to the field of the inductor, or whose centers of the sections are arranged in a curve away from the the inductor.
- the compensation means comprise at least one current transformer, or mediating or compensating inductor or current balancing, connected between the end turn and at least one other internal turn, especially the fore-end. adjacent turn or any other internal turn, to balance the intensity of the currents between the end turn and the other internal turn, the intensity through (a turn end being reduced while that of the other turn internal is It is possible to add a larger number of transformers in order to balance the current in several turns near the ends of the inductor The number of current transformers can reach the number of turns.
- a multi-strand cable insulated from one another may comprise at least one cooling device, in particular constituted by a flexible conduit, made of a non-electrically conductive material, in particular a plastic material, for the passage of a cooling fluid, the strands being wrapped or braided around the flexible conduit.
- a cooling device in particular constituted by a flexible conduit, made of a non-electrically conductive material, in particular a plastic material, for the passage of a cooling fluid, the strands being wrapped or braided around the flexible conduit.
- the cooling device may further comprise a sheath surrounding the cable, in which a cooling fluid passes, in particular air or water or any coolant.
- the heating device may comprise a capacitor, or a capacitor bank, connected between the terminals of the power supply, and N distinct elementary inductive parts, connected together in series by N-I capacitors or connecting capacitor banks.
- the range of strands or subgroups of strands can be curved.
- the power supply terminal can be curved.
- the heating device may comprise monospires or multispires which are connected singly or in groups in series, or in parallel.
- the invention also relates to a power inductor, for heating an induced element, having the characteristics set out above.
- the invention also relates to a heating furnace for electrically conductive element characterized in that it comprises an induction heating device as defined above.
- the invention consists, apart from the arrangements set out above, in a certain number of other arrangements which will be more explicitly discussed below with regard to embodiments described with reference to the accompanying drawings, but which are not in no way limiting.
- FIG. 1 is a vertical cross section, schematic of a heating device according to the invention.
- Fig. 2 is an electrical diagram of the device of FIG. 1
- Fig. 3 is a partial view in vertical elevation, on a larger scale, of the right connecting end of the device of FIG. 1.
- Fig. 4 is a top view, on a larger scale, of the right end of the device of FIG. 1.
- Fig. 5 is a perspective diagram of a multi-coil inductor with a range of strands in a plane passing through the axis of the magnetic flux.
- Fig. Fig. 6 shows, in Fig. 5, a multispire inductor with a fan of the strands in a plane perpendicular to the axis of the magnetic flux.
- Fig. 7 is a partial view on a larger scale according to the arrow VII of Fig.6 of the connection bars of the fans strands.
- Fig. 8 is a vertical sectional diagram of an external cooling device of conductors of the inductor
- Fig. 9 is a transverse vertical section illustrating, on a larger scale than in FIG. 8, ie cooling device with grouping of four cables in a sheath.
- Fig. 10 is a schematic axial vertical section of the end of an inductor with additional deviating turns.
- Fig. It shows, in Fig. 10, an alternative embodiment of the deviating additional turns.
- Fig. 12 is a circuit diagram of a means for compensating the lower inductance of the end turns, with a current transformer.
- Frg. 13 is an electrical diagram, in vertical elevation, of an inductor with concentric turns.
- Fig. 14 is a schematic section along the line XIV-XIV of FIG. 13.
- Fig. 15 is a diagrammatic view in vertical elevation of a conductor with turns permuted by four.
- FIG. 16 is a schematic view along line XVI-XV! of Fig. 15.
- FIG. 17 is a diagrammatic view in vertical elevation of an inductor consisting of four elementary inductive elements, forming a quadrilateral, interconnected at their vertices by capacitor banks, and
- Fig. 18 is an equivalent circuit diagram of the inductor of FIG. 17.
- an induction heating device 1 having a high frequency power supply with frequency converter 2.
- the frequency is greater than 5 kHz and can exceed 400 kHz.
- the device 1 comprises a power inductor 3 adapted to heat an induced element 4.
- the inductor 3 comprises turns surrounding the induced element 4 which scrolls horizontally inside the coils of the inductor 3 in a direction orthogonal to the plane of Fig. 1.
- the inductor 3 may be formed by a juxtaposition or stack of m ⁇ nospires each located in a vertical plane orthogonal to the direction of movement of the element 4, The turns are connected in parallel.
- the inductor 3 provides longitudinal flow heating.
- the induced element 4 is constituted in particular by a metal strip, in particular a steel strip.
- the heating device could be of the transverse flux type, in which case the mean plane of the turns of the inductor would be substantially parallel to the plane of the induced element so that the electromagnetic field created is substantially orthogonal to the plane of the induced element.
- the turns of the power inductor are traversed by a current whose intensity is generally at least 100 A.
- the power of the inductor 3 normally leads to consider its realization with at least one conductor of large cross section.
- the inductor 3 is made with cables Litz 5a, 5b strands 6 multiple insulated between them, usually by a varnish.
- the individual diameter of the strands 6 is sufficiently small so that it makes it possible to overcome the skin effect due to the high frequency of the current.
- the diameter of a conductive strand is in particular of the order 0.1 mm (1/10 th of a millimeter) for a frequency of 50 kHz.
- the number of strands 6 is a function of the total current which passes through the turns of the inductor 3.
- the strands or fits 6 are fed in parallel. They are grouped generally in the form of a twisted or braided cable.
- the strands may be surrounded by an envelope sheath 7 of insulating material, but such an envelope is not essential. Due to the high intensity required by a power inductor, the number of fives or strands 6 of a cable can be many thousands or tens of thousands.
- the cables 5a, 5b form a substantially rectangular frame surrounding the armature element 4.
- this frame could be formed with a single cable bent to the desired contour.
- Each cable has a substantially horizontal central portion held by supports 8 of insulating material.
- the ends of the conductors 5a, 5b are curved towards the horizontal plane containing the band 4 and their end is curved substantially in the plane of this band.
- the ends of the cable 5a have been designated 5a1 and 5a2.
- the cable 5b is preferably offset in a direction orthogonal to the plane of the strip.
- the conductive wires 6 are disengaged from the possible sheath 7 over a length sufficient to allow the multitude of wires 6 to expand into a fan for connection to a metal bar elongate.
- the fans 9.1, 9.2 at each of its ends constitute plies whose average plane is vertical, orthogonal to the direction of movement of the strip 4.
- several parallel fan plies can be formed. .
- the opening of the fan 9.1. 9.2 is such that sufficient space exists between the wires released from their envelope 7 to reduce the effects of parasitic inductance.
- the fan 9.1, 9.2 preferably extends on either side of the geometric axis X-X (FIG 3) of the extremity of the cable concerned.
- the opening of the fan is advantageously such that the strands or son 6 at the limit of the fan form with the axis X-X an angle ⁇ that can reach or exceed 60 °.
- the ends of the strands 6 are released from their insulating varnish and are connected in parallel to the metal bar 10.1 or 10.2 by welding, in particular solder to hold, it is essential to ensure the development of the conductors back and forth in order to to ensure a minimum inductance and a good distribution of the current in the strands, it is what makes it possible to preserve a sections of passage of the current approximately constant, a density of approximately constant current.
- the bars 10.1, 10.2 form with a metal bar 11 a single piece or possibly two associated parts.
- the assembly is held by bars 12 of insulating material, which are not shown in FIG. 4.
- the cable 5b comprises at each end at least one fan ply 9.1b formed of strands connected in parallel, by welding, to a metal bar 10.1b (Fig.4) for the fan 9.1b, while the bar and fan on the other end are not visible in the drawings.
- the bars 10.1, 10.1b are electrically connected to the armatures 13.1, 13.1b of the capacitor C1, these armatures being separated by a dielectric insulation layer 14, in particular a layer of air.
- Each cable 5a, 5b comprises a cooling device comprising at least one duct 15a, 15b of insulating material, in particular of plastic, traversed by a cooling fluid, in particular water or air.
- the strands 6 are helically wound or braided around or duct 15a or 15b which extends along the geometric axis of the cable considered.
- the flexible cooling duct 15a is disengaged from the fan and connected by a connector 16 to a fluid circuit that can be provided in the bar 11. Another end of the bar is provided with a connection 17 for the supply or the evacuation of the cooling fluid.
- a plurality of plate-like capacitors may be connected in parallel to the corresponding metal bar 10.1.
- Four armatures 13.11, 13.12, 13.13 and 13.14 are provided according to the variant of FIG. 3, to which correspond four other armatures vis-à-vis, connected to the cable 5b.
- the cooling device comprises a pipe 15c, 15d, brazed on a bar 10.1, 10.1b or on the bar 11.
- the cooling device comprises at least one duct drilled into the metal of the bar 11.
- the cooling pipes 15a, 15b of the cable are of flexible material insulating electricity.
- the pipes 15c, 15d of the bars 10.1, 10.1b are made of copper or brass or any other good heat conducting metal.
- the fixing of the capacitor plates 13.1, 13.1b on the bars 10.1, 10.1b can be carried out using horizontal screws 18.1, 18, 1b passing through the plates 13.1, 13, 1b up to the bars 10.1, 10.1b where they are screwed. Other conventional fasteners may be used.
- Fig. 5 shows an inductor formed by an isolated multi-strand cable, helically wound in a plurality of turns to form a multispire having a certain extent along the Y-Y axis of the magnetic flux. It is then possible to place the fan 6 in a plane passing through the Y-Y axis, or parallel to this axis, without creating a congestion problem. Indeed, the range 6 is included, or substantially included, between the two end planes of the multispire orthogonal to the Y-axis.
- the length H (FIG. 7) of the metal rod 10.1, 10.1b, forming a connection terminal is equal to at least five times the diameter of the cable 5, 5a, 5b and preferably greater than ten times the diameter of the cable.
- the height H may be of the order of 400 mm, while the cable diameter is of the order of 30 mm.
- several parallel fan plies can be provided.
- the strands of strands or subgroups of fan-shaped strands are soldered flat against bar 10.1, 10.1b.
- the thickness Ep of the superposed layers is less than, or of the same order as, the penetration depth P of the high frequency current in the power supply terminal bar.
- the penetration depth P may be of the order of 0.1 mm to 0.5 mm, depending on the frequency and the metal used,
- the solution of the invention makes it possible to obtain a low current density up to the capacitors by the arrangement of the fan-shaped strands, and this independently of the type of cooling of the cable.
- the fan-shaped connection of the wires 6 to the bars or terminals 10.1, 10.1b makes it possible to greatly limit the connection losses at the capacitors C1 ... C1.3, and in the current path in the capacitors.
- the cable 5a at its left end 5a2 is connected in the same way as on the right end by a fan 9.2 son to a bar 10.2. It is the same for the cable ⁇ b with another bar not visible.
- capacitor plates 13.31, 13.32, 13.33 are connected to the bar 10.2.
- the flexible cooling ducts 15a, 15b are connected to the circuit located in the bar 11, itself connected to collectors G of cooling fluid.
- the scheme of FIG. 2 shows the electric circuit made with the inductor 3 of Fig. 1. The same references have been used to designate the symbolic representations of inductances and capacitors.
- the generator 2 is connected to the terminals of the capacitor C1 and that from one terminal of this capacitor to the other are connected in series the inductance formed by the conductor 5a, the capacitor C2 situated at the opposite end of the conductors 5a and 5b and the inductance formed by the conductor 5b.
- Fig. 8 illustrates another device for cooling the cables 5a, 5b which are surrounded by an electrically insulating sheath 19a, 19b, for example of silicone tube, defining an annular passage around the cables 5a, 5b.
- An inlet 20a, 20b for the cooling fluid is provided, substantially mid-length of the ducts, which open towards the bent end of the driver, before reaching the fan 9.1 or 9.2. Cooling gas including air is blown through the inlets 20a, 20b and is distributed on both sides to cool the outside cables 5a, 5b.
- Fig. 9 shows, in cross-section, two sheaths of electrically insulating tube 19a1, 19b1 in which four cables are grouped together ⁇ a, 5b. Each sheath has its inlet 20a1, 20b1 for the cooling fluid.
- the cooling fluid could consist of a liquid, in particular water, in which case a collector would be provided to collect the cooling water in the vicinity of each end close to the 9.1, 9.2.
- FIG. 9 The arrangement of FIG. 9, combining several cables in the same sheath can reduce the number of forced ventilation ducts. It is possible to group the cables by four especially if you work with a double pitch at the capacitors.
- FIG. 10 Several individual or single-spiral turns (FIG. 10), each formed by cables 5a and 5b, may be provided coaxial, orthogonal to the axis of the inductor, juxtaposed parallel to the direction of movement of the element to be heated.
- a turn such as 21 (FIG 10) located in the stack thus formed is between two other turns which contribute to increase the inductance, or self, of the turn 21.
- An end turn such as 22, located at the right end according to FIG. 10, has a turn adjacent to one side, so that the inductance of the turn 22 will be lower than that of the inner turns. This end turn 22 will then be traversed by a current of greater intensity, generating overheating, when the turns are connected in parallel.
- FIG. 10 shows an alternative embodiment of the compensation means to prevent overheating of the end turn 22.
- Additional turns 26, 26, 27, 28 of larger diameter, following the end turn 22, are arranged. such that the centers of their sections are on an outwardly convex curve arc 29 connecting to the center alignment line of the inner coil sections.
- the diameter of the turns 25-28 increases gradually
- Fig. 12 illustrates another embodiment of the compensation means to prevent overheating of the end turn 22.
- the inductor turns shown schematically in FIG. 12, are monospires connected in parallel between two supply lines E1, E2 under the voltage U.
- the inner turns such as 21 have a self L.
- the compensating inductor can be connected to any of the poles of the coil, the important is that the ampere-turns generated by one of the turns neutralizes those of the other turn.
- the two windings of the transformer 31 are subjected to opposite voltages + U and -U.
- the intensity transformer 31 ensures a decrease in the intensity in the end turn 22 and an increase in the intensity in the inner turn 32, so as to balance the currents in the two turns 22 and 32, and to bring back the intensity passing through these turns to a value close to the intensity passing through the internal turns such as 21.
- FIGS. 13 and 14 schematically illustrate a double-layer inductor with concentric turns.
- the diagrams of FIGS. 13 and 14 show internal turns formed by cables 3.11 ... 3, n1 and 3.12 ... 3.n2 located in the same vertical plane orthogonal to the direction of movement of the element 4 to be heated.
- the conductors of each turn are connected, at their ends, respectively to the plates of the capacitors C1, C2 in a manner similar to the diagrams of FIGS. 1 and 2.
- the generator 2 is connected across the terminals of the capacitor C1.
- Concentric outer turns are made with conductors 103.11 ... 103.n1 on one side of the plane of the element 4 and 103.12 ... 103.n2 on the other side of the plane of the element 4, these turns being connected in parallel with the plates of the capacitors C1 and C2 as illustrated in FIG. 13.
- the inner turns, formed by the conductors such as 3.11 - 3.12, have an inductance L1 lower than the inductance L2 of the outer turns formed by conductors such as 103.11-103.12.
- the intensity M of the current flowing through the inner turns is therefore greater than that of the current flowing through the outer turns.
- Fig. 15 and 16 show a variant in which the turns are exchanged in pairs or multiples, here advantageously four to balance the inductance values of the different turns as well as the currents.
- Strands of four cables are formed (Fig. 16) and twisted, for example 180 °, from a capacitor C1 to capacitor C2 so that the two cables 3.11- 3.21 which are in the inner layer at the connection to the capacitor C1 are in the outer layer at the connection to the capacitor C2, and vice versa for the cables 103, 11 and 103.12 of the group of four cables.
- the inductances of each turn formed of four cables are then equal, as are the currents.
- the cables grouped by four also make it possible to obtain a lateral permutation in the end turns and to promote the balancing of the currents in these end turns.
- Fig. 17 shows an embodiment according to which the inductor comprises four cables or groups of cables 5a, 5b, 5c, 5d forming a quadrilateral, substantially in the shape of a rectangle, surrounding the element to be heated 4.
- the wires released at each end of the conductors are deployed and fan-connected to a metal bar connected on the other side to one or more capacitor plates C1-C4.
- the ends of the cable ⁇ a are connected by bundles of fan wires 9.a1, 9.a2 bars 10ad and 10ac.
- the latter is connected to a supply terminal of the source 2.
- Another bar (not visible in Fig. 17) is located behind the bar 10ac and is connected to the range of wires 9c1 of the conductor 5c. In opposition to the fans, the bars are connected to the plates of the capacitor C1. It is the same for the other summits of the quadrilateral.
- the connecting bars 10ac, 10ad, 10bd, 10cb are inclined with respect to the mean plane of the element to be heated 4, and are substantially orthogonal to the bisector of the angles at the vertices of the quadrilateral, which makes it possible to minimize the radii of curvature of the cables.
- the inclination of the connecting bars may be different, the bars may even be vertical or horizontal.
- the ends of the cables 5a- ⁇ d are curved concavely outwards.
- the outer curvature of the cables, designated 33 for the left end of the cable 5a, is provided to reduce the number of bends, as well as the space to be magnetized.
- FIG. 17 The assembly illustrated in FIG. 17 is shown schematically in FIG. 18. This is a "quadrupleur" montage. Such an arrangement makes it possible to mount at high voltages, at high frequencies.
- the high-frequency power inductors, according to the invention in multi-strand cables insulated from each other, make it possible to obtain a high efficiency.
- the connection of the wires at their ends is designed to limit as much as possible the connection losses at level of the capacitors, as well as the current path in the capacitors.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Induction Heating (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0901970A FR2944942B1 (fr) | 2009-04-23 | 2009-04-23 | Dispositif de chauffage par inducteur de puissance, inducteur de puissance, et four ainsi equipe |
PCT/IB2010/051744 WO2010122505A1 (fr) | 2009-04-23 | 2010-04-21 | Dispositif de chauffage par inducteur de puissance, inducteur de puissance, et four ainsi équipé |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2422580A1 true EP2422580A1 (fr) | 2012-02-29 |
EP2422580B1 EP2422580B1 (fr) | 2017-07-19 |
Family
ID=41172222
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10719098.5A Active EP2422580B1 (fr) | 2009-04-23 | 2010-04-21 | Dispositif de chauffage par inducteur de puissance, inducteur de puissance, et four ainsi équipé |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP2422580B1 (fr) |
CN (1) | CN102415209B (fr) |
FR (1) | FR2944942B1 (fr) |
WO (1) | WO2010122505A1 (fr) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113260722A (zh) * | 2019-01-14 | 2021-08-13 | 首要金属科技奥地利有限责任公司 | 用于在轧制设备中对工件进行感应加热的装置 |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1465926A1 (de) * | 1964-07-31 | 1969-07-03 | Licentia Gmbh | Verfahren zur Herstellung einer Kontaktverbindung an einem duennen leitenden Folienband |
FR2693072B1 (fr) * | 1992-06-24 | 1994-09-02 | Celes | Perfectionnements apportés aux bobines de système de chauffage par induction. |
JPH1050217A (ja) * | 1996-08-06 | 1998-02-20 | Hitachi Ltd | 偏向ヨーク装置の製造方法及び偏向ヨーク装置 |
JP4722373B2 (ja) * | 2002-12-19 | 2011-07-13 | パナソニック株式会社 | 溶接トランス |
FR2852187A1 (fr) * | 2003-03-07 | 2004-09-10 | Celes | Dispositif de chauffage par induction d'une bande metallique |
FR2890824B1 (fr) * | 2005-09-15 | 2007-11-23 | Commissariat Energie Atomique | Four de fusion a dispositif inducteur a une seule spire compose d'une pluralite de conducteurs |
FR2902274B1 (fr) * | 2006-06-09 | 2008-08-08 | Celes Sa | Dispositif de chauffage par induction a haute frequence, et four a induction equipe d'un tel dispositif |
-
2009
- 2009-04-23 FR FR0901970A patent/FR2944942B1/fr active Active
-
2010
- 2010-04-21 CN CN201080017559.5A patent/CN102415209B/zh active Active
- 2010-04-21 EP EP10719098.5A patent/EP2422580B1/fr active Active
- 2010-04-21 WO PCT/IB2010/051744 patent/WO2010122505A1/fr active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2010122505A1 * |
Also Published As
Publication number | Publication date |
---|---|
CN102415209B (zh) | 2014-04-30 |
WO2010122505A1 (fr) | 2010-10-28 |
CN102415209A (zh) | 2012-04-11 |
FR2944942A1 (fr) | 2010-10-29 |
EP2422580B1 (fr) | 2017-07-19 |
FR2944942B1 (fr) | 2011-07-22 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP6522017B2 (ja) | 高周波電流供給電線 | |
KR100706494B1 (ko) | 초전도 케이블 | |
EP1604551B1 (fr) | Dispositif de chauffage par induction d'une bande metallique. | |
EP2422580B1 (fr) | Dispositif de chauffage par inducteur de puissance, inducteur de puissance, et four ainsi équipé | |
US10062497B2 (en) | Pseudo edge-wound winding using single pattern turn | |
FR3004024A1 (fr) | Dispositif de transmission sans fil d'energie par induction a un recepteur | |
EP2027754B1 (fr) | Dispositif de chauffage par induction a haute frequence, et four a induction equipe d'un tel dispositif | |
CN201805614U (zh) | 一种用于医用电子直线加速器的聚焦线圈 | |
JP2009164012A (ja) | 誘導加熱コイル | |
EP0221921B1 (fr) | Aimant solenoidal sans fer | |
EP0099274B1 (fr) | Transformateur, notamment abaisseur de tension pour machine à souder électrique | |
US20160247629A1 (en) | Transformer for reducing eddy current losses of coil | |
EP0538124B1 (fr) | Inducteur de chauffage par induction de bandes métalliques | |
JP2017174968A (ja) | 高周波用リアクトル | |
EP2580767B1 (fr) | Bobine de lissage a air pour fortes puissances | |
KR101187323B1 (ko) | 고주파 유도가열기의 수랭식 트랜스포머 및 이의 제조방법 | |
EP1993111A1 (fr) | Refroidissement du noyau magnétique d'une bobine d'induction. | |
JP2013149460A (ja) | 電線およびコイル | |
FR2972890A1 (fr) | Systeme inductif pouvant servir de creuset froid | |
WO2021116632A1 (fr) | Dispositif électrotechnique pour un aéronef | |
EP2109344A2 (fr) | Corps de chauffe de radiateur électrique comportant un filament métallique à enroulement hélicoïdal à zones de spires différenciées | |
WO2021136918A1 (fr) | Dispositif pour connecter une source de puissance a un inducteur | |
FR2674781A1 (fr) | Dispositif inductif compact d'apport de chaleur pour realiser de petites soudures sur des pieces metalliques. | |
WO2021116599A1 (fr) | Dispositif électrotechnique pour un aéronef comprenant des composants bobinés basse fréquence | |
BE479095A (fr) |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 20111116 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR |
|
DAX | Request for extension of the european patent (deleted) | ||
GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
|
INTG | Intention to grant announced |
Effective date: 20170215 |
|
GRAS | Grant fee paid |
Free format text: ORIGINAL CODE: EPIDOSNIGR3 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: FG4D Free format text: NOT ENGLISH |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: EP |
|
REG | Reference to a national code |
Ref country code: IE Ref legal event code: FG4D Free format text: LANGUAGE OF EP DOCUMENT: FRENCH |
|
REG | Reference to a national code |
Ref country code: AT Ref legal event code: REF Ref document number: 911574 Country of ref document: AT Kind code of ref document: T Effective date: 20170815 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R096 Ref document number: 602010043716 Country of ref document: DE |
|
REG | Reference to a national code |
Ref country code: NL Ref legal event code: MP Effective date: 20170719 |
|
REG | Reference to a national code |
Ref country code: LT Ref legal event code: MG4D |
|
REG | Reference to a national code |
Ref country code: AT Ref legal event code: MK05 Ref document number: 911574 Country of ref document: AT Kind code of ref document: T Effective date: 20170719 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: NO Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20171019 Ref country code: LT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20170719 Ref country code: FI Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20170719 Ref country code: NL Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20170719 Ref country code: HR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20170719 Ref country code: SE Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20170719 Ref country code: AT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20170719 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: BG Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20171019 Ref country code: LV Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20170719 Ref country code: ES Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20170719 Ref country code: PL Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20170719 Ref country code: GR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20171020 Ref country code: IS Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20171119 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: PLFP Year of fee payment: 9 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R097 Ref document number: 602010043716 Country of ref document: DE |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: RO Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20170719 Ref country code: DK Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20170719 Ref country code: CZ Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20170719 |
|
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: EE Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20170719 Ref country code: SK Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20170719 Ref country code: SM Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20170719 Ref country code: IT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20170719 |
|
26N | No opposition filed |
Effective date: 20180420 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SI Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20170719 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: MT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20170719 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: MC Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20170719 |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
REG | Reference to a national code |
Ref country code: IE Ref legal event code: MM4A |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LU Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20180421 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: CH Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20180430 Ref country code: LI Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20180430 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20180421 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: TR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20170719 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: HU Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT; INVALID AB INITIO Effective date: 20100421 Ref country code: PT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20170719 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: MK Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20170719 Ref country code: CY Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20170719 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 20240320 Year of fee payment: 15 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 20240320 Year of fee payment: 15 Ref country code: BE Payment date: 20240320 Year of fee payment: 15 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20240320 Year of fee payment: 15 |