Coil arrangement, induction heating apparatus and production line

Abstract

The invention relates to a coil arrangement (1), an induction heating apparatus for heating a metal workpiece (2) that can be moved in a movement direction (R1), and a production line for producing and / or processing a metal workpiece (2).

Description

[0001] Page 1 of 38

[0002] Applicant: SMS group GmbH

[0003] Our reference number: P81013DE

[0004] September 17, 2024

[0005] Coil assembly, induction heating device and production line

[0006] The present invention relates to a coil device for an induction heating device, an induction heating device for heating a metallic workpiece and a production line for manufacturing and / or processing a metallic workpiece.

[0007] The coils of known induction heating devices are supplied with electrical energy from an electrical power source via power electronic components such as transformers, inverters, rectifiers, and capacitors. Depending on the electrical connection of the coils, the induction heating devices can be designed as longitudinal field or transverse field heating devices.

[0008] In this process, transverse field heating devices are usually formed by pairs of coils opposite each other with respect to a conveying plane of a metallic workpiece to be heated, whereas a longitudinal field heating device usually has a coil that surrounds a metallic workpiece to be heated.

[0009] An induction heating device can have different operating states. During idle operation, that is, operation without a metallic workpiece to be heated within the effective range of the induction heating device, the coils of the induction heating device are subjected to a symmetrical load (page 2 / 38).

[0010] P81013DE applies, particularly during the entry phase of a metallic workpiece into the operating range of the induction heating device or during the exit phase from the operating range, asymmetrical loads can occur on the coils. During these phases, the coils are subjected to different thermal loads and can therefore exhibit different temperatures. Due to the temperature-dependent electrical properties of the coils, these temperature differences, in turn, affect the uniformity of the heating of the metallic workpiece.

[0011] Furthermore, asymmetrical heating of the metallic workpiece can occur if the workpiece is not guided centrally past the coil(s). For example, the distance between the top of a metallic workpiece and a coil located above it may differ from the distance between the underside of the workpiece and a coil located below it. This results in uneven heating of the metallic workpiece and simultaneously places uneven stress on the coils. This also reduces the efficiency of the induction heating device in heating the metallic workpiece.

[0012] The present invention is based on the objective of providing a coil device that enables more uniform heating of a metallic workpiece and simultaneously allows for more uniform loading of the coils. Furthermore, the energy efficiency of heating the metallic workpiece is to be increased.

[0013] The problem underlying the present invention is solved by a coil assembly with the features of claim 1. Advantageous embodiments of the coil assembly are described in the dependent claims. Page 3 / 38

[0014] P81013DE

[0015] In more detail, the problem underlying the present invention is solved by a coil device for an induction heating device comprising four primary conductors, each primary conductor having an end section for electrically conductive connection with a power supply device, and a connecting device, wherein the connecting device is configured to electrically connect the primary conductors to each other, or the primary conductors are electrically connected to each other by the connecting device.

[0016] A coil assembly designed in this way has the advantage that, when used as intended, it enables more uniform heating of the metallic workpiece and simultaneously allows for a more uniform load distribution on the primary conductors. For example, when a metallic workpiece enters the operating range of an induction heating device, compensating currents between the primary conductors can flow through the connecting device. This makes it possible to equalize electrical potentials between the primary conductors caused by an unbalanced load, thus achieving a more uniform load distribution on the primary conductors and enabling more uniform heating of the metallic workpiece.

[0017] The intended use of the coil assembly refers to its use in an induction heating device. In other words, the coil assembly can be used as part of an induction heating device for heating metallic workpieces.

[0018] A primary conductor can be designed to conduct an electric current, especially an alternating current. In other words, a primary conductor can be an electrically conductive material. Page 4 / 38

[0019] P81013DE or be formed from such. The electrically conductive material may be copper, silver, or any other metal or metal alloy.

[0020] A primary conductor can have a conductor profile or be configured as such. For example, a primary conductor can have a busbar or be configured as such. The conductor profile can have one or more curved sections. The conductor profile can have one or more curved sections. The conductor profile can have one or more straight sections.

[0021] The profile sections of a conductor profile can be materially bonded to one another. For example, the profile sections of a conductor profile can be welded or soldered together. A profile section of a conductor profile can be designed as a monolithic component. A monolithic component is a component formed from a single piece.

[0022] A ladder profile can have a first profile section and a second profile section arranged transversely to the first profile section. An angle of less than or equal to 120°, less than or equal to 110°, less than or equal to 100°, or less than or equal to 90° can be included between the first and second profile sections. The ladder profile can have a third profile section, which can be arranged transversely to the first and / or second profile sections. An angle of less than or equal to 120°, less than or equal to 110°, less than or equal to 100°, or less than or equal to 90° can be included between the first and third profile sections. An angle of less than or equal to 120°, less than or equal to 110°, less than or equal to 100°, or [page 5 / 38] can be included between the second and third profile sections.

[0023] P81013DE must be enclosed at an angle of less than or equal to 90°. The conductor profile may have a fourth profile section, wherein the fourth profile section may be arranged transversely to the first profile section and / or the second profile section and / or the third profile section.

[0024] A conductor profile preferably extends significantly more in its longitudinal direction than in its lateral and vertical directions. A cross-section of the conductor profile is preferably formed in a plane spanned by both the lateral and vertical directions. The longitudinal direction of the conductor profile is preferably orthogonal to the cross-section. The longitudinal direction of the conductor profile can be curved, particularly semicircular, at least in sections. The longitudinal direction of the conductor profile can also be straight, at least in sections.

[0025] The longitudinal extent of a primary conductor designed as a conductor profile can be the extent of the conductor profile in the longitudinal direction of the conductor profile. The lateral extent of a primary conductor designed as a conductor profile can be the extent of the conductor profile in the lateral direction of the conductor profile. The vertical extent of a primary conductor designed as a conductor profile can be the extent of the conductor profile in the vertical direction of the conductor profile.

[0026] A conductor profile can have a hollow cross-section, preferably a rectangular hollow cross-section, and particularly preferably a square hollow cross-section. Alternatively, a conductor profile can have an elliptical hollow cross-section. Preferably, a conductor profile can have an annular cross-section. For example, a pipe (page 6 / 38)

[0027] P81013DE designed conductor profile has an annular cross-section. A conductor profile with a hollow profile cross-section can have a constant wall thickness.

[0028] A conductor profile can have a rectangular cross-section, preferably a square cross-section. Alternatively, a conductor profile can have an elliptical cross-section. Preferably, a conductor profile can have a circular cross-section. For example, a conductor profile designed as a round bar has a circular cross-section.

[0029] A profile section of a conductor profile preferably extends significantly more in a longitudinal direction than in a lateral or vertical direction. A cross-section of the profile section of a conductor profile is preferably formed in a plane spanned by the lateral and vertical directions. The longitudinal direction of the profile section of a conductor profile preferably runs orthogonally to the cross-section of the profile section. The longitudinal direction of the profile section of a conductor profile can be curved, particularly semicircular, at least in some sections. The longitudinal direction of the profile section of a conductor profile can also be straight, at least in some sections.

[0030] A profile section of a conductor profile can have a hollow cross-section, preferably a rectangular hollow cross-section, and particularly preferably a square hollow cross-section. Alternatively, a profile section of a conductor profile can have an elliptical hollow cross-section. Preferably, a profile section of a conductor profile can have an annular cross-section. For example, a profile section of a conductor profile designed as a tube has an annular cross-section. A profile section ei- Page 7 / 38

[0031] P81013DE nes conductor profile with a hollow profile cross-section can have a constant wall thickness .

[0032] A profile section of a conductor profile can have a rectangular cross-section, preferably a square cross-section. Alternatively, a profile section of a conductor profile can have an elliptical cross-section. Preferably, a profile section of a conductor profile can have a circular cross-section. For example, a conductor profile designed as a round bar has a circular cross-section.

[0033] A free cross-section of a conductor profile with a hollow profile cross-section can be designed as a cooling channel. The cooling channel can provide a flow path for a fluid, preferably a cooling fluid, and particularly preferably a cooling liquid. The free cross-section of a conductor profile with a hollow profile cross-section preferably has no material or a material different from the electrically conductive material of the primary conductor.

[0034] Preferably, an end section of a primary conductor limits the primary conductor from its surroundings. More preferably, an end section of a primary conductor completely limits the primary conductor from its surroundings. Preferably, an end section of a primary conductor limits the primary conductor in its length, width, and / or height from its surroundings. In other words, an end section of a primary conductor can be the end of a physical extension of the primary conductor. Put another way, a physical extension of a primary conductor can terminate at an end section.

[0035] Preferably, an end section of one primary conductor is physically separate from an end section of another primary conductor. In other words, an end section of a primary conductor can be... Page 8 / 38

[0036] P81013DE The end section of a primary conductor may be designed as a physically separate component section from an end section of another primary conductor. In particular, an end section of one primary conductor may have less than a direct, physical connection to an end section of another primary conductor.

[0037] An end section of a primary conductor can have an end surface, wherein the end surface can limit the primary conductor in the longitudinal direction of the primary conductor relative to its surroundings. The end surface of the primary conductor can be arranged in a plane spanned by the lateral and vertical directions of the primary conductor. The end surface can be a flat surface. Alternatively, the end surface can be a curved surface. The end section of a primary conductor can extend from a point on the end surface of the end section by less than or equal to 0.4 times the length of the primary conductor, preferably less than or equal to 0.2 times the length of the primary conductor, and particularly preferably less than or equal to 0.1 times the length of the primary conductor, in the longitudinal direction of the primary conductor.For example, a primary conductor having a rectangular hollow profile cross-section and a straight longitudinal extent may have an end section extending from a point on the end face by less than or equal to 0.2 times the length of the primary conductor in the direction of longitudinal extent. The end face may be an end face of a primary conductor.

[0038] An end section and / or an end surface may be configured to be physically connected, at least indirectly, preferably directly, to a power supply device. The physical connection may be materially bonded and / or form-fitted and / or force-fit. Page 9 / 38

[0039] P81013DE

[0040] The connection device may have a conductor profile or be designed as such. The connection device may have a cable or be designed as such. The connection device may have a cross-section that corresponds, at least partially, to the cross-section of a primary conductor.

[0041] Preferably, all primary conductors are electrically connected to each other by the connecting device. Preferably, the connecting device is configured to electrically connect all primary conductors to each other.

[0042] The connecting device can be physically connected, at least indirectly, preferably directly, to at least two primary conductors, and particularly preferably to all primary conductors. The connecting device can be configured to be physically connected, at least indirectly, preferably directly, to at least one primary conductor, preferably to two primary conductors, and particularly preferably to all primary conductors. The physical connection can be materially interlocked and / or form-fit and / or force-fit. For example, the connecting device can be welded or soldered to one, two, three, or all primary conductors.

[0043] The connecting device can have a longitudinal extent that is orthogonal to the longitudinal extent of a primary conductor. The longitudinal extent of the connecting device can be significantly greater than its lateral extent and / or its vertical extent.

[0044] The connecting device can have an H-shape, an X-shape, and / or an I-shape in a top view of a plane spanned by the lateral and vertical directions of a primary conductor. Page 10 / 38

[0045] P81013DE

[0046] The coil assembly can have more than one connecting device, preferably two, three, four or more than four connecting devices.

[0047] Preferably, the coil assembly is designed such that a primary conductor has a width extent of less than or equal to 150 mm, preferably less than or equal to 125 mm, and particularly preferably less than or equal to 100 mm, at least in sections.

[0048] A coil assembly designed in this way has the advantage that, when used as intended, a current with increased intensity can flow through the primary conductors. This allows for accelerated heating of a metallic workpiece. In particular, it allows for an improved, and especially an increased, electrically effective cross-sectional area of ​​the primary conductor. The current density of an electric current flowing through a primary conductor decreases from a surface of the primary conductor towards its thickness. Therefore, the electrically effective cross-sectional area can be effectively increased, for example, by increasing the width of the primary conductor.The thickness of a primary conductor can run in the same direction as its height, with the thickness being only that part of the primary conductor in which it contains electrically conductive material. When the coil assembly is used as intended, the width of a primary conductor runs, at least in sections, in the direction of the length of the metallic workpiece.

[0049] A primary conductor can be at least partially, preferably in the intended use of the coil assembly in the area of ​​a side of the Pri- facing a metallic workpiece - Page 11 / 38

[0050] P81013DE conductor, have a width extent of less than or equal to 150 mm, preferably less than or equal to 125 mm, further preferably less than or equal to 100 mm, more preferably less than or equal to 60 mm, again preferably less than or equal to 55 mm and particularly preferably less than or equal to 50 mm.

[0051] An electrically effective material cross-sectional area of ​​a primary conductor preferably comprises electrically conductive material.

[0052] Preferably, the coil assembly is designed such that the connecting device has at least a section of an electrically effective material cross-sectional area that is smaller than or equal to an electrically effective material cross-sectional area of ​​a primary conductor.

[0053] A coil device designed in this way has the advantage that, when the coil device is used as intended, compensating currents can flow between the primary conductors with a current strength that corresponds to the current strength of the current flowing through the primary conductors.

[0054] Preferably, the connecting device has at least a section having an electrically effective material cross-sectional area that is less than or equal to 0.75 times, preferably less than or equal to 0.5 times, and particularly preferably less than or equal to 0.25 times the electrically effective material cross-sectional area of ​​a primary conductor.

[0055] Preferably, the connecting device has an electrically effective cross-sectional area that is smaller than or equal to the electrically effective cross-sectional area of ​​a primary conductor. Page 12 / 38

[0056] P81013DE

[0057] The connecting device can have, at least in sections, an electrically effective cross-sectional area that is greater than or equal to the electrically effective cross-sectional area of ​​a primary conductor. Preferably, the connecting device can have, at least in sections, an electrically effective cross-sectional area that is greater than or equal to 1.25 times, preferably greater than or equal to 1.5 times, and particularly preferably greater than or equal to 1.75 times, the electrically effective cross-sectional area of ​​a primary conductor.

[0058] Preferably, the coil device is designed such that each primary conductor has a connecting section, wherein the connecting section of a primary conductor is spaced apart from the end section of the primary conductor, and wherein the connecting device is configured to be at least indirectly connected to the connecting sections of the primary conductors, or wherein the connecting device is at least indirectly connected to the connecting sections of the primary conductors.

[0059] A coil assembly designed in this way has the advantage that, when used as intended, it allows for improved flow of equalizing currents between the primary conductors. This makes it possible to achieve more uniform electrical potentials between the primary conductors, resulting in a more even distribution of the load on the primary conductors and thus enabling more uniform heating of the metallic workpiece.

[0060] Preferably, the connecting device is configured to be physically, and in particular directly physically, connected to the connecting sections of the primary conductors. Preferably, the connecting device is physically, and in particular directly physically, connected to the connecting sections of the primary conductors. Page 13 / 38

[0061] P81013DE Primary conductor connected. The physical connection can be material-fit, form-fit, and / or force-fit. For example, the connection device can be welded or soldered to the connection sections of the primary conductors.

[0062] Preferably, the connecting section of a primary conductor is spaced apart from the end section of the primary conductor along a longitudinal and / or lateral and / or vertical extent. Preferably, the connecting section is spaced greater than or equal to 300 mm from the end section of the primary conductor, more preferably greater than or equal to 500 mm, more preferably greater than or equal to 1,000 mm, more preferably greater than or equal to 1,500 mm, and particularly preferably greater than or equal to 2,000 mm. The connecting section is preferably spaced less than or equal to 5,500 mm from the end section of the primary conductor, more preferably less than or equal to

[0063] 3.500 mm and especially preferably less than or equal to

[0064] 2 . 500 mm .

[0065] Preferably, the connecting section of a primary conductor is monolithically connected to the primary conductor. For example, a profile section of a primary conductor designed as a conductor profile can be configured as a connecting section.

[0066] Preferably, the connecting section of a primary conductor is arranged opposite the end section of the primary conductor along its length. For example, in the case of a primary conductor with a straight length, the connecting section is arranged opposite the end section of the primary conductor in a plane defined by the width and height of the primary conductor. Page 14 / 38

[0067] P81013DE

[0068] Preferably, the coil assembly is designed such that the connecting device has less than one turn.

[0069] A coil assembly designed in this way has the advantage that it can be manufactured in a simplified manner. Furthermore, such a coil assembly can be used more easily in an induction heating device.

[0070] The phrase "the connecting device has less than one turn" means that the connecting device itself has less than one turn, in particular less than one turn relative to the effective range of an induction heating device. An effective range of an induction heating device with a previously described coil assembly is the area in which, when the coil assembly is used as intended, an effective connection exists between the induction heating device and a metallic workpiece to be heated. For example, if an alternating current flows through the primary conductors of the coil assembly, a magnetic field generated by this alternating current can interact with a metallic workpiece located within the effective range of the induction heating device and preferably heat it.

[0071] The effective area of ​​the induction heating device can be at least partially limited by the primary conductors of the coil assembly. In particular, the effective area can be located between the primary conductors of the coil assembly.

[0072] The connecting device can form an angle of less than or equal to 180°, preferably less than or equal to 120°, and particularly preferably less than or equal to 90° along its length. The connecting device can be found on page 15 / 38.

[0073] P81013DE is formed as a conductor profile, wherein the conductor profile is formed from a straight profile section.

[0074] Particularly preferably, the coil assembly can be designed such that the coil assembly has two or fewer turns, preferably two or fewer turns with respect to an effective area of ​​an induction heating device.

[0075] Preferably, the coil device is designed such that two primary conductors are electrically connected to each other by means of a first winding conductor section, two further primary conductors are electrically connected to each other by means of a second winding conductor section, and the connecting device is configured to be at least indirectly connected to the winding conductor sections, or the connecting device is at least indirectly connected to the winding conductor sections.

[0076] A coil device designed in this way has the advantage that, when used as intended, it can generate an increased magnetic flux, so that a metallic workpiece can be heated more quickly.

[0077] Preferably, the first winding conductor section is directly or indirectly connected to the two primary conductors by a material connection, a positive connection, and / or a force connection. For example, the first winding conductor section is welded or soldered to the two primary conductors. The first winding conductor section and one or two primary conductors can be designed as a monolithic component.

[0078] For example, a primary conductor can transition into the first winding conductor segment, preferably continuously. In other words, a primary conductor can have a length extension as shown on page 16 / 38.

[0079] P81013DE

[0080] The transition to the first coiled conductor section should have a continuous course.

[0081] For example, a primary conductor designed as a conductor profile can have a profile section with a straight longitudinal extent and one or more profile sections with a curved or sinuous longitudinal extent, wherein the first winding conductor section can have at least one of the profile sections with a curved or sinuous longitudinal extent or can be designed as such.

[0082] Preferably, the second winding conductor section is directly or indirectly connected to the two other primary conductors by a material connection, a positive connection, and / or a force connection. For example, the second winding conductor section is welded or soldered to the two other primary conductors. The second winding conductor section and one or both of the other primary conductors can be designed as a monolithic component.

[0083] For example, one or both of the two additional primary conductors can transition into the second winding section, preferably continuously. In other words, the length of one or both of the two additional primary conductors can be continuous at the transition to the second winding section.

[0084] For example, a primary conductor designed as a conductor profile can have one profile section with a straight longitudinal extent and one or more profile sections with a curved or sinuous longitudinal extent, wherein the second winding conductor section can have at least one of the profile sections with a curved or sinuous longitudinal extent or can be designed as such. Page 17 / 38

[0085] P81013DE

[0086] A coiled conductor section can have a conductor profile or be configured as such. The conductor profile of a coiled conductor section can have at least one curved or serpentine profile section, wherein the profile section can enclose an angle of less than or equal to 90°, preferably less than or equal to 180°, and particularly preferably less than or equal to 360° along its length. The profile section of the conductor profile of a coiled conductor section can enclose an angle greater than 360° along its length. The conductor profile of a coiled conductor section can have at least one profile section with a straight length. The conductor profile of a coiled conductor section can have at least one profile section with a meandering length.

[0087] Preferably, the coil assembly is designed such that the connecting device is configured to be connected to the first winding conductor section after a first winding conductor half of the first winding conductor section and to be connected to the second winding conductor section after a first winding conductor half of the second winding conductor section, or the connecting device is connected to the first winding conductor section after a first winding conductor half of the first winding conductor section and to the second winding conductor section after a first winding conductor half of the second winding conductor section.

[0088] A coil assembly designed in this way has the advantage that, when used as intended, equalizing currents between the primary conductors can flow more evenly, resulting in a more uniform load on the primary conductors and thus more uniform heating of a metallic workpiece. Page 18 / 38

[0089] P81013DE

[0090] A winding half of a winding ladder segment preferably has a length that is half the length of the winding ladder segment. Preferably, the first winding half and a second winding half of a winding ladder segment divide the winding ladder segment into two halves with equal lengths. Preferably, the first winding half and the second winding half of a winding ladder segment each enclose an angle along their lengths that is half the angle enclosed by the winding ladder segment along its length. For example, the first winding half and the second winding half of a winding ladder segment that encloses an angle of 360° along its length can each enclose an angle of 180° along their lengths.

[0091] Preferably, the coil assembly is designed such that the connecting device is configured to be connected to the first winding conductor section between the first winding conductor half and a second winding conductor half of the first winding conductor section, and to be connected to the second winding conductor section between the first winding conductor half and a second winding conductor half of the second winding conductor section, or the connecting device is connected to the first winding conductor section between the first winding conductor half and a second winding conductor half of the first winding conductor section, and to the second winding conductor section between the first winding conductor half and a second winding conductor half of the second winding conductor section.

[0092] Preferably, the coil assembly is designed such that the connecting device is flexible. Page 19 / 38

[0093] P81013DE

[0094] A coil assembly designed in this way has the advantage that, when used as intended, the distance between a metallic workpiece to be heated—which is located within the effective range of the induction heating device, or is entering and / or exiting the effective range—and the primary conductors of the coil assembly can be changed. This allows the metallic workpiece to be heated more evenly.

[0095] A flexible connection device preferably allows for length compensation between the primary conductors. A flexible connection device can, for example, include a cable or be designed as such.

[0096] Alternatively, the connection device can be rigid. For example, the connection device can transition into a primary conductor. The connection device can have a cross-sectional area that corresponds to the cross-sectional area of ​​one or all primary conductors.

[0097] Preferably, the coil assembly is designed such that one primary conductor is movably mounted relative to another primary conductor.

[0098] A coil assembly designed in this way has the advantage that, when used as intended, the distance between a metallic workpiece to be heated—which is located within the effective range of the induction heating device, or is entering and / or exiting the effective range—and the primary conductors of the coil assembly can be varied. This allows the metallic workpiece to be heated more evenly. Page 20 / 38

[0099] P81013DE

[0100] Preferably, the primary conductor is movably mounted in the longitudinal direction and / or in the lateral direction and / or in the vertical direction of the primary conductor relative to another primary conductor.

[0101] Preferably, the primary conductor is movably mounted relative to two and especially preferably relative to three further primary conductors.

[0102] Preferably, all primary conductors are mounted so that they can move independently of one another. In other words, one primary conductor can be moved relative to another or to all other primary conductors independently of all other primary conductors.

[0103] Preferably, two primary conductors are forcibly coupled together. In other words, two primary conductors are preferably fixed relative to each other. Two forcibly coupled primary conductors preferably have a constant relative position to each other. Preferably, the four primary conductors are each forcibly coupled together in pairs. In other words, each pair of primary conductors is preferably fixed relative to each other.

[0104] Preferably, each primary conductor is arranged at a distance from each other primary conductor. Preferably, one of the primary conductors is arranged at a distance from at least one other primary conductor in two orthogonal directions.

[0105] The coil assembly can have at least one first coil, wherein the first coil has at least two of the primary conductors. The first coil can have three or four of the primary conductors. The coil assembly can have a second coil, wherein the second coil has at least two more of the primary conductors. Page 21 / 38

[0106] P81013DE

[0107] Preferably, the coil device is designed such that a primary conductor is movably mounted relative to a metallic workpiece that can be moved in one direction of movement.

[0108] A coil assembly designed in this way has the advantage that, when used as intended, the distance between a metallic workpiece to be heated—which is located within the effective range of the induction heating device and / or is entering and / or exiting the effective range—and the primary conductors of the coil assembly can be changed. This allows the metallic workpiece to be heated more evenly.

[0109] In particular, the perpendicular distance between one of the primary conductors and the metallic workpiece, especially a top and / or bottom surface of the metallic workpiece, can be decreased and / or increased. A perpendicular distance can, for example, be a distance in a vertical direction.

[0110] Preferably, the coil device is designed such that the coil device can be positioned relative to a metallic workpiece movable in a direction of movement in such a way that the primary conductors are arranged transversely to the metallic workpiece in such a way that a length extension of each primary conductor runs at least partially orthogonal to the direction of movement, and the connecting device is arranged on the same side as the end sections of the primary conductors with respect to the metallic workpiece.

[0111] A coil assembly designed in this way has the advantage that, when used as intended, the coil assembly can be displaced transversely to a metallic workpiece, even while the metallic workpiece is moving. Page 22 / 38

[0112] P81013DE

[0113] The workpiece is located within the effective range of the induction heating device. This allows the coil assembly to be easily removed from the metallic workpiece, for example, in the event of a collision between the metallic workpiece and the coil assembly or in any other malfunction.

[0114] Preferably, the coil assembly is designed such that the coil assembly has a first core and / or a second core.

[0115] The first core and / or the second core is / are preferably configured to provide a magnetic path for a magnetic flux and to direct and / or concentrate the magnetic flux in a predetermined direction. The magnetic flux is preferably generated by the primary conductors of the coil assembly during intended use of the coil assembly. In other words, the first core and / or the second core is / are preferably magnetic concentrators.

[0116] The first core and / or the second core preferably has / have a soft magnetic material or is / are made of a soft magnetic material.

[0117] The problem underlying the invention is further solved by an induction heating device for heating a metallic workpiece that can be moved in a direction of movement, wherein the induction heating device has a previously described coil arrangement and a first power supply arrangement, wherein the first power supply arrangement is electrically conductively connected to the coil arrangement.

[0118] Such a designed induction heating device has the advantage that it enables more uniform heating of the metallic workpiece and simultaneously ensures consistent temperature distribution. Page 23 / 38

[0119] P81013DE A more moderate load on the coil assembly occurs. For example, when a metallic workpiece enters the operating range of an induction heating device, compensating currents between the primary conductors can flow through the connecting device. This makes it possible to achieve electrical potentials between the primary conductors simultaneously, resulting in a more uniform load on the primary conductors and thus enabling more uniform heating of the metallic workpiece.

[0120] The first power supply device may include a capacitor device. The capacitor device may include a single capacitor or a plurality of capacitors. The plurality of capacitors may be connected in parallel and / or in series. The capacitor device may be electrically connectable to an electrical power source, for example, an alternating current source.

[0121] The power supply device may include an inverter device, wherein the inverter device is electrically connected to the capacitor device.

[0122] The induction heating device can have a first resonant circuit, wherein the first resonant circuit can include the capacitor arrangement of the first power supply device and at least two of the primary conductors of the coil arrangement, and is configured to generate a magnetic field for heating a metallic workpiece moving in the direction of motion. The first resonant circuit can include at least the connecting arrangement of the coil arrangement in sections.

[0123] The direction of movement and a horizontal direction orthogonal to the direction of movement can define a plane of movement. A metallic workpiece moving in the direction of movement is preferably arranged in the plane of movement (page 24 / 38).

[0124] P81013DE has a width extent in the horizontal direction and a length extent in the direction of movement. A vertical direction arranged orthogonally to the direction of movement and the horizontal direction, together with the direction of movement and the horizontal direction, forms an orthogonal coordinate system. The metallic workpiece moving in the direction of movement can have a thickness extent in the direction of the vertical direction.

[0125] A metallic workpiece can be designed as a substantially planar workpiece, for example as a metal sheet, a metal strip, a metal slab, or a metal plate. In other words, such a metallic workpiece has a thickness that is significantly less than its width or length. A metallic workpiece can also be a semi-finished product.

[0126] Within the operating range of an induction heating device, a moving metallic workpiece can be in operative contact with the coil assembly. When the coil assembly is energized with an alternating current, a metallic workpiece located within the operating range of the induction heating device is heated by a magnetic field generated by the alternating current flowing through the coil assembly.

[0127] A metallic workpiece is preferably movable through the effective area of ​​the induction heating device in such a way that the plane of movement is arranged centrally in the direction of the thickness of the metallic workpiece. Page 25 / 38

[0128] P81013DE

[0129] An induction heating device designed in this way has the advantage that a metallic workpiece can be heated more evenly.

[0130] The coil assembly can be arranged in the induction heating device such that two of the primary conductors are arranged facing a first side of the metallic workpiece, and two further primary conductors are arranged facing a second side of the metallic workpiece opposite the first side.

[0131] The induction heating device can have a transfer device, wherein the transfer device is configured to move at least one, preferably all, primary conductors relative to each other and / or relative to a metallic workpiece that is located in an effective area of ​​the induction heating device and / or enters and / or exits it.

[0132] An induction heating device designed in this way has the advantage that the induction heating device can always be operated in an optimal efficiency range and at the same time the risk of a mechanical collision between metallic workpieces and the coil device is reduced.

[0133] The transfer device can be configured to move the primary conductors simultaneously.

[0134] The induction heating device may include a control and regulating device, wherein the control and regulating device is configured to control and / or regulate the supply of electrical energy to the coil device. Furthermore, the control and regulating device may (page 26 / 38)

[0135] P81013DE must be configured to control and / or regulate the transfer device.

[0136] Preferably, an induction heating device is designed such that the first power supply device is electrically connected to two of the primary conductors, and the induction heating device has a second power supply device, wherein the second power supply device is electrically connected to two further primary conductors.

[0137] Such a designed induction heating device has the advantage that it enables even more uniform heating of the metallic workpiece.

[0138] The induction heating device may have a second resonant circuit, wherein the second resonant circuit may include the capacitor arrangement of the second power supply arrangement and at least two further primary conductors of the coil arrangement. The second resonant circuit may include the connecting arrangement at least partially.

[0139] Preferably, an induction heating device is designed such that the induction heating device is configured to generate a longitudinal magnetic field and / or a transverse magnetic field.

[0140] Preferably, an induction heating device is designed such that it is configured to switch between generating a longitudinal magnetic field and generating a transverse magnetic field, preferably during operation of the induction heating device. Page 27 / 38

[0141] P81013DE

[0142] Such a designed induction heating device has the advantage that metallic workpieces of varying thicknesses can each be heated by a magnetic field best suited to their respective thickness. This allows for improved, more uniform heating of the metallic workpiece.

[0143] The problem underlying the invention is further solved by a production line for the manufacture and / or processing of a metallic workpiece, wherein the production line comprises a previously described coil device and / or a previously described induction heating device, and a device for the thermal processing of metallic workpieces, and / or a device for the mechanical processing of metallic workpieces.

[0144] The device for the thermal treatment of metallic workpieces can be designed as a furnace, for example as a melting furnace.

[0145] The device for the mechanical treatment of metallic workpieces can be designed as a rolling device, a cutting device, or a punching device. The device for the mechanical treatment of metallic workpieces can be designed as a forming device or as a device for machining metallic workpieces.

[0146] Further advantages, details, and features of the invention will become apparent from the illustrated examples below. Specifically, the following will be shown:

[0147] Figure 1: a schematic representation of a coil device according to a first embodiment;

[0148] Figure 2: a schematic representation of a coil assembly according to a second embodiment; page 28 / 38

[0149] P81013DE

[0150] Figure 3: a schematic representation of a coil device according to a third embodiment;

[0151] Figure 4: a schematic representation of a coil assembly according to a fourth embodiment; and

[0152] Figure 5: a schematic representation of a coil device according to a fifth embodiment.

[0153] In the following description, identical reference symbols denote identical components or identical features, so that a description given for one component in relation to one figure also applies to the other figures, thus avoiding repetitive descriptions. Furthermore, individual features described in connection with one embodiment can also be used separately in other embodiments.

[0154] Figure 1 shows a schematic representation of a coil assembly 1 according to a first embodiment in a perspective view. The coil assembly 1 has four primary conductors 10, each of which has an end section 11 for electrically conductive connection to a power supply device. The coil assembly 1 has a connecting device 20, the primary conductors 10 being electrically connected to each other by the connecting device 20.

[0155] The connecting device 20 has, at least in sections, an electrically effective material cross-sectional area that is smaller than the electrically effective material cross-sectional area of ​​the primary conductors 10. The primary conductors 10 have the same electrically effective material cross-sectional area.

[0156] The primary conductors 10 are each designed as a conductor profile, with each conductor profile having a straight longitudinal extent. The longitudinal extent of a primary conductor is significantly greater than its lateral extent and a page 29 / 38

[0157] P81013DE

[0158] Vertical extension of the primary conductor. An end section 11 of a primary conductor 10 limits the primary conductor 10 from the environment, so that a physical extension of the primary conductor 10 ends at the end section 11.

[0159] Each primary conductor 10 has a connecting section 12, wherein the connecting section 12 of a primary conductor 10 is spaced apart along the length of the primary conductor 10 from the end section 11 of the primary conductor 10. The connecting device 20 is directly physically connected to the connecting sections 12 of the primary conductors 10.

[0160] In the intended use of the coil device 1, a metallic workpiece 2 moved in a direction of movement RI can be moved through an effective area of ​​an induction heating device not shown in Figure 1, which is at least partially limited by the primary conductors 10 of the coil device 1.

[0161] The primary conductors 10 are spaced apart from each other in the direction of movement RI and / or in a vertical direction R3. In a horizontal direction R2, the primary conductors 10 are arranged in the same position.

[0162] The connecting device 20 has less than one turn, in particular less than one turn with respect to the effective area of ​​the induction heating device. The connecting device 20 is designed as a conductor profile, wherein the conductor profile has a first profile section 21 whose length extends in the direction of movement RI. The conductor profile of the connecting device 20 further has a second and a third profile section 22, 23, whose lengths each extend in the vertical direction R3 and which are directly connected to the first profile section 21. In a top view of a section extending in the direction of movement RI, see page 30 / 38.

[0163] P81013DE and the vertical direction R3 on a tensioned plane, the connecting device 20 has an H-shape. The first profile section 21 has an electrically effective material cross-section that is smaller than an electrically effective material cross-section of a primary conductor 10. The second and third profile sections 22, 23 each have an electrically effective material cross-section that corresponds to an electrically effective material cross-section of a primary conductor 10.

[0164] Figure 2 shows a schematic representation of a coil assembly 1 according to a second embodiment in a perspective view. The connecting device 20 is designed as a conductor profile, the conductor profile having a first profile section 21 whose length extends in the direction of movement RI. The conductor profile of the connecting device 20 further has a second and a third profile section 22, 23, whose lengths each extend in the vertical direction R3 and which are directly connected to the first profile section 21. In a top view of a plane spanned by the direction of movement RI and the vertical direction R3, the connecting device 20 has an H-shape. The first, second, and third profile sections 21, 22, 23 each have an electrically effective material cross-section that is smaller than an electrically effective material cross-section of a primary conductor 10.

[0165] Figure 3 shows a schematic representation of a coil assembly 1 according to a third embodiment in a perspective view. The connecting device 20 is designed as a conductor profile, wherein the conductor profile has a first profile section 21 whose length extends in the vertical direction R3. In a top view of a plane spanned by the direction of movement RI and the vertical direction R3, the connecting device 20 has an I-shape. The first profile section 21 has an electrically effective Ma- Page 31 / 38

[0166] P81013DE material cross-section on , which is smaller than an electrically effective material cross-section of a primary conductor 10 .

[0167] Figure 4 shows a schematic representation of a coil assembly 1 according to a fourth embodiment in a perspective view. The connecting element 20 is designed as a conductor profile, the conductor profile having a first profile section 21 and a second profile section 22. The first profile section 21 and the second profile section 22 intersect at midpoints of their respective lengths. In a top view of a plane spanned by the direction of motion RI and the vertical direction R3, the connecting element 20 has an X-shape. The first profile section 21 and the second profile section 22 have an electrically effective cross-sectional area equal to that of a primary conductor 10.

[0168] Figure 5 shows a schematic representation of a coil assembly 1 according to a fifth embodiment in a perspective view. Two of the primary conductors 10 are electrically connected to each other by means of a first winding conductor section 30, and two further primary conductors 10 are electrically connected to each other by means of a second winding conductor section 40, wherein the connecting device 20 is directly connected to the first winding conductor section 30 and the second winding conductor section 40.

[0169] The first winding section 30 is designed as a conductor profile and forms an angle of 540° along its length. The first winding section 30 has a first winding section 31 and a second winding section 32, each winding section 31, 32 forming an angle of 270° along its length. The second winding section 40 is designed as a conductor profile and forms an angle of 540° along its length. Page 32 / 38

[0170] P81013DE a . The second winding conductor section 40 has a first winding conductor half 41 and a second winding conductor half 42, wherein each winding conductor half 41, 42 encloses an angle of 270° along its length.

[0171] The connecting device 20 is directly connected to the first winding conductor section 30 after a first winding conductor half 31 of the first winding conductor section 30 and directly connected to the second winding conductor section 40 after a first winding conductor half 41 of the second winding conductor section 40.

[0172] The primary conductors 10 are arranged transversely to the metallic workpiece 2 such that a length extension of each primary conductor 10 is at least sectionally orthogonal to the direction of movement RI, and the connecting device 20 is arranged on the same side as the end sections 11 of the primary conductors 10 with respect to the metallic workpiece 2.

[0173] Page 33 / 38

[0174] P81013DE

[0175] Reference symbol list

[0176] 1 Coil assembly

[0177] 2. Metallic workpiece

[0178] 10 Primary conductors

[0179] 11 End section (of a primary conductor)

[0180] 12 Connection section (of a primary conductor)

[0181] 20 Connection device

[0182] 21 First profile section (of the conductor profile of the connecting device)

[0183] 22 Second profile section (of the conductor profile of the connecting device)

[0184] 23 Third profile section (of the conductor profile of the connecting device)

[0185] 30 First winding conductor section

[0186] 31 First half of the winding conductor (of the first winding conductor section)

[0187] 32 Second half of the winding ladder (of the first winding ladder section)

[0188] 40 Second winding conductor section

[0189] 41 First half of the winding conductor (of the second winding conductor section)

[0190] 42 Second half of the winding ladder (of the second winding ladder section)

[0191] RI movement direction

[0192] R2 Horizontal direction

[0193] R3 Vertical direction

Claims

Page 34 / 38 P81013DE Patent claims 1. Coil assembly (1) for an induction heating device, comprising: four primary conductors (10) , each primary conductor (10) having an end section (11) for electrically conductive connection to a power supply device; and a connecting device (20) ; wherein the connecting device (20) is configured to electrically connect the primary conductors (10) to each other; or the primary conductors (10) are electrically connected to each other by the connecting device (20).

2. Coil device (1) according to claim 1, characterized in that a primary conductor (10) has at least sectionally a width extent of less than or equal to 150 mm, preferably less than or equal to 125 mm, and particularly preferably less than or equal to 100 mm.

3. Coil device (1) according to claim 1 or claim 2, characterized in that the connecting device (20) has at least sectionally an electrically effective material cross-sectional area which is smaller than or equal to an electrically effective material cross-sectional area of ​​a primary conductor (10).

4. Coil assembly (1) according to one of the preceding claims, characterized in that each primary conductor (10) has a connecting section (12) has the connecting section (12) of a Page 35 / 38 P81013DE the primary conductor (10) is spaced apart from the end section (11) of the primary conductor (10); and wherein the connecting device (20) is configured to be at least indirectly connected to the connecting sections (12) of the primary conductors (10); or wherein the connecting device (20) is at least indirectly connected to the connecting sections (12) of the primary conductors (10).

5. Coil assembly (1) according to one of the preceding claims, characterized in that the connecting device (20) has less than one turn.

6. Coil assembly (1) according to one of the preceding claims, characterized in that two primary conductors (10) are electrically connected to each other by means of a first winding conductor section (30); two further primary conductors (10) are electrically connected to each other by means of a second winding conductor section (40); and the connecting device (20) is configured to be at least indirectly connected to the winding conductor sections (30, 40); or the connecting device (20) is at least indirectly connected to the winding conductor sections (30, 40).

7. Coil assembly (1) according to claim 6, characterized in that the connecting device (20) is configured to be connected to the first winding conductor section (30) after a first winding conductor half (31) of the first winding conductor section (30) and after a first winding conductor- Page 36 / 38 P81013DE half (41) of the second winding conductor section (40) to be connected to the second winding conductor section (40); or the connecting device (20) is connected to the first winding conductor section (30) after a first winding conductor half (31) of the first winding conductor section (30) and is connected to the second winding conductor section (40) after a first winding conductor half (41) of the second winding conductor section (40).

8. Coil assembly (1) according to one of the preceding claims, characterized in that the connecting device (20) is flexible.

9. Coil assembly (1) according to one of the preceding claims, characterized in that a primary conductor (10) is movably mounted relative to another primary conductor (10).

10. Coil device (1) according to one of the preceding claims, characterized in that a primary conductor (10) is movably mounted relative to a metallic workpiece (2) that can be moved in a direction of movement (RI).

11. Coil assembly (1) according to one of the preceding claims, characterized in that the coil assembly (1) can be positioned relative to a metallic workpiece (2) movable in a direction of movement (RI) such that the primary conductors (10) are arranged transversely to the metallic workpiece (2) such that a longitudinal extent of each primary conductor (10) is at least partially orthogonal to the direction of movement (RI); and the connecting device (20) is arranged on the same side as the end sections (11) of the primary conductors (10) with respect to the metallic workpiece (2). Page 37 / 38 P81013DE 12. Induction heating device for heating a metallic workpiece (2) movable in a direction of movement (RI), wherein the induction heating device has the following features: a coil assembly (1) according to one of the preceding claims; and a first power supply device which is electrically conductively connected to the coil assembly (1).

13. Induction heating device according to claim 12, characterized in that: the first power supply device is electrically connected to two of the primary conductors (10); and the induction heating device has a second power supply device, wherein the second power supply device is electrically connected to two further primary conductors (10).

14. Induction heating device according to claim 12 or 13, characterized in that the induction heating device is configured to generate a longitudinal magnetic field and / or a transverse magnetic field.

15. Production line for the manufacture and / or processing of a metallic workpiece (2) , wherein the production line has the following features: a coil device (1) according to one of claims 1 to 11 and / or an induction heating device according to one of claims 12 to 14; and a device for thermal processing of metallic workpieces; and / or a device for mechanical processing of metallic workpieces.

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