Structure for manufacturing induction coil, induction coil having the structure, and method for manufacturing the induction coil

Abstract

The present invention relates to a structure for manufacturing an induction coil, an induction coil having the same, and a method for manufacturing the same. The structure for manufacturing the induction coil comprises eight flat support arms which are fixed to a central connecting part, the support arms being fixed to the part with inner free ends, the outer free ends of which are free. Each supporting arm is provided with at least two long and thin retaining supports extending in the longitudinal direction of the supporting arm. Each supporting arm is provided with a plurality of holding openings used for holding the support in the longitudinal direction of the supporting arm. Each retaining bracket is fastened at both ends with rivets in the retaining openings. Each supporting arm is provided with a longitudinal groove in the longitudinal direction of the supporting arm, and each maintaining opening is connected to the corresponding longitudinal groove through a short connecting groove. The retaining bracket is retained as an assembly / transport position in a first fastening position on the longitudinal slot and is retainable as an end position in a second fastening position in a retaining opening different from the first fastening position. This allows the induction coil winding to move relatively below the holding bracket along the support arm.

Description

Technical Field

[0001] The invention relates to a structure for producing an induction coil, to an induction coil comprising an induction coil winding on such a structure and finally to a method for producing such an induction coil. Background Art

[0002] For example, it is known from CN 101432608 A1 to arrange an induction coil in the form of a sphere outside a bowl-shaped structure. The induction coil is used to heat a metal cooking vessel placed inside the structure.

[0003] Another such spherical induction coil is known from DE 10 2008 052 815 A1. The induction coil windings are each arranged approximately at regular intervals. Summary of the invention

[0004] The present invention is based on the object of providing a structure for producing an induction coil, an induction coil having such a structure and a method for producing such an induction coil using such a structure, wherein preferably the storage and transportation of the induction coil is simple and safe and furthermore the production of the induction coil is particularly simple.

[0005] This object is solved by a structure having the features of claim 1, an induction coil having the features of claim 15 and a method having the features of claim 20. Advantageous and preferred configurations of the invention are the subject matter of the further claims and are explained in more detail below. In this case, certain features may be described only for the structure, only for the induction coil or only for the method for its production. In any case, however, they are intended to be applicable individually to the structure and the induction coil and the method for its production, independently of one another. The wording of the claims is made with the aid of explicit reference to the contents of the description.

[0006] The structure for manufacturing an induction coil according to the invention comprises at least four elongated support arms, for example eight arms or more, preferably an even number. These support arms are flat and flexible so that they can be bent. Flat can mean that their thickness can be between 5 and 30 times their width. Their length can be at least ten times, up to twenty or thirty times or more their width. The structure has a central connecting part or connecting area, to which the support arms are fixed with internal free ends. Such fixing can be particularly non-rotatable, so that the structure will not change in this arrangement. The outer free ends of these arms are preferably free. In this respect, the structure can be similar to a star or can be spoke-shaped, wherein the support arms protrude from the central connecting part in a radial direction. At least one retaining bracket is arranged on each support arm, in particular at least two retaining brackets, preferably three to five or six brackets. These retaining brackets are elongated and extend in the longitudinal direction of the support arm at a certain distance above the support arm, so that in the distance between the retaining bracket and the support arm there is space for multiple turns of the induction strand of the induction coil, preferably space for one layer of induction strand, wherein, in particular, the distance between the support arm and the retaining bracket is 2% to 40% greater than the thickness of the induction strand.

[0007] According to the invention, at least two or more holding openings for holding the support are arranged on each support arm along the longitudinal direction of the support arm, preferably precisely along this longitudinal direction. The holding openings may have a circular shape or, alternatively, a longitudinal shape. Each such holding support can be fastened in the holding opening at its two ends by means of fastening means, wherein the fastening means are generally designed to allow a certain movement of the support along the support arm. For this reason, they can be designed to pass through the support arm, for which purpose prefabricated holes or slots are provided, in particular in the holding opening. The fastening means are preferably a screw / nut combination, a fastening pin or a rivet. In this way, the induction coil can be wound onto the structure in a planar state and fixed by means of the holding support. Thereafter, the structure is bent in the bending manner of the support arm or bent as a whole into a circular or spherical state.

[0008] In a preferred embodiment of the present invention, at least one longitudinal groove is arranged on each support arm and along its longitudinal direction, preferably arranged parallel to the arm, wherein it can be laterally displaced from the central longitudinal axis of the arm. Each retaining opening is connected to the corresponding longitudinal groove by means of a short connecting groove, alternatively the retaining opening can have a longitudinal shape to be directly connected to the longitudinal groove, and in another embodiment can even have an angular shape. The retaining bracket is retained in a first fastening position on the longitudinal groove as an assembly / transportation position, so that the fastening device is in the longitudinal groove, but not in the retaining opening. In these retaining openings, the retaining bracket is only or eventually retained in a second fastening position, which is the end position. When the induction heating coil is fixed to the spherical vessel, this end position is reached, which will be explained later. This end position is different from the first fastening position, not only because the fastening device is located in the retaining opening instead of the longitudinal groove, but also because the position of the retaining bracket along the support arm in this end position is different from the position in the assembly / transportation position. Thus, the longitudinal slot with its length or longitudinal extension serves to enable the at least one holding bracket to be moved along this extension and finally to come to rest in this end position when the induction heating coil together with the structure is in its final shape.

[0009] In another preferred embodiment of the invention, each support arm is provided with only a single longitudinal groove, but two or more longitudinal grooves may also be provided, in particular longitudinal grooves parallel to each other. The longitudinal grooves should or may extend parallel to the longitudinal direction of the support arm, or along the center line or displaced a few millimeters laterally relative thereto. It may be provided that the center line extends exactly through the middle between the line holding the opening and the one or more longitudinal grooves.

[0010] In another embodiment, a short slot section can be guided in the direction from each retaining opening to the longitudinal slot away from the retaining opening to connect the retaining opening to the slot. Such a short slot section can be at least as long as the diameter or width of the retaining opening, in particular twice or three times its length. The short slot section can preferably extend parallel to the longitudinal slot. The connecting slot can be guided or extended from the slot section towards the longitudinal slot at an angle, which angle can in particular be a right angle. The short connecting slot can be at least as long as the width of the longitudinal slot, so that it can be identified as a completely different slot.

[0011] In another embodiment, at least two, preferably at most ten, holding openings on one support arm are connected to the longitudinal slot. Their number may correspond to the number of holding brackets, so that two openings are provided for each bracket, wherein this number may also be greater. For example, the support arm may also be configured to receive a different number of holding brackets and / or brackets of different lengths.

[0012] It can also be provided that all support arms are identically formed and / or circumferentially fastened to the connecting part, preferably in an equidistant configuration. They can be formed to have the same orientation in the circumferential direction, in particular with regard to the relative position between the holding opening and the longitudinal groove. The support arms can protrude from the connecting part in radial direction, so that in particular the structure can be formed in a star shape or with the arms as radial spokes protruding from a central connecting part. The connecting part can be formed in a circular or annular form, wherein it can preferably have a central opening. This can be used for the purpose of connecting to a vessel or the like.

[0013] In another embodiment of the invention, the holding bracket is fastened to the support arm at its two free ends by means of the previously explained fastening means, preferably screw-like or rivet-like fastening pins. The holding bracket may have a wide holding section between the two free ends. In this wide holding section, each holding bracket can hold a plurality of induction wire strands in place on the support arm as induction coil windings of the induction coil, in particular four to twenty or even thirty. These windings are preferably arranged in a plane parallel to the plane of the flat support arm. Preferably, these windings are next to each other and no winding crosses another winding due to the restrictions of the flat holding bracket.

[0014] The fastening means or pins, respectively, should in particular pass through or through the support arm. Preferably, all holding brackets are applied to the support arm from one side, preferably in contact with the arm, while they are fastened on the other side, so that corresponding means for completing the fixation by the fastening means are provided on this other side. This is particularly preferred in the case of screws and nuts.

[0015] In another preferred embodiment of the invention, the holding bracket with the fastening device can be displaced along the longitudinal slot, which is necessary when the induction coil mounted on the structure is bent, as will be described later. The distance between two fastening pins on a holding bracket in the longitudinal direction of the longitudinal slot can correspond to the distance of the holding openings, preferably to the distance of two adjacent holding openings.

[0016] Preferably, the support arm may have a recess or hole at the end facing away from the connection portion, which end should be the free end. Such a recess or hole can be used to fix the free end of the bent support arm, preferably to the vessel carrying the induction coil.

[0017] A complete induction coil mounted or fixed to the structure explained previously comprises an induction coil winding of an induction strand, which winding is mounted or positioned on the structure. The induction coil is spirally wound into a plurality of rings or close-circular rings, or more precisely, spiral rings of different diameters. As mentioned above, the induction coil should in particular be wound into one layer. Each ring or spiral ring of the induction coil winding extends along a support arm or abuts against a support arm. In this area, the induction strand abuts against the support arm and is fixed to the support arm by means of a retaining bracket. Thus, the retaining bracket can form a group of windings in one plane. Preferably, exactly one bracket is provided for each ring or spiral ring of the induction coil winding on each support arm, which can amount to two to five or six brackets on each support arm.

[0018] In an alternative, the induction coil is wound from a single continuous induction strand. The induction coil has an inner end and an outer end, the ends being formed by the start and end of the induction strand, respectively. The induction coil windings are arranged in a continuous manner in between, so that the strand is not interrupted. The induction coil can only be operated as a whole.

[0019] In another alternative, the induction coil comprises at least two partial induction coils, each of which can be electrically connected and operated independently of the other partial induction coils. Thus, the size and power of the induction heating can be varied. Each partial induction coil can be formed by at least one ring with a plurality of windings, and each partial induction coil has two electrical connections. As a result, the partial induction coil can be composed of one or more rings of windings. Preferably, the innermost or outermost ring can be a separate partial induction coil to better influence the size or area of ​​the induction heating. Even more preferably, this should be the outermost ring.

[0020] The induction coil described above can be manufactured and manufactured onto the structure described above accordingly by using it. For this manufacture, a structure as described above is provided in a plane, which structure should be planar or flat accordingly. The induction strands are positioned or laid or wound onto the structure or onto the supporting arms of the structure accordingly. The winding sequence can preferably be from the inside to the outside or from the connecting part to the larger radius. This allows the windings to be placed one onto the previous one. In this case, the induction strands are wound onto the radially inner holder of the device for winding the induction coils. Each new induction coil winding is then applied radially outward to the already existing inner induction coil winding. Alternatively, the induction coil can be wound from the outside to the inside in the opposite direction and manner. The induction coil is wound onto the structure in at least two rings, wherein they are spaced apart from each other. Preferably, the induction coil is wound onto the structure in four rings. Holding brackets are attached for fastening the induction coil winding of the induction strand to the support arm, wherein preferably the holding brackets are each attached after the winding of each ring has been completed and before the winding of the next ring will begin. With this method, each ring of the winding can be safely completed and fixed before starting the next ring.

[0021] Furthermore, it can also be provided that, when the winding has been completed and after all the holding brackets have been attached, the induction coil is ready in a semi-finished state. In this state, it should not be used for induction heating, but can be stored and transported in a very simple and advantageous manner. The induction coil would be used in a spherical shape in conventional use, preferably mounted to a spherical vessel, but in this spherical shape it would require much more space and effort to store and transport. Therefore, mounting the induction coil according to the invention in a flat or planar state as an intermediate stage offers some advantages.

[0022] When the induction coil is to be fixed to a cooking or heating vessel as a final step, the induction coil together with the structure is spherically bent or curved from its planar shape to a curved shape. This is done in such a way that the holding bracket and the induction strand held by the bracket are moved from a first position along the longitudinal slots via the connecting slots into a second position in the holding opening. The holding bracket is thus moved and its fastening means are moved along the inside of the slots into the holding opening, which is its second and final position.

[0023] Furthermore, for mounting to a cooking vessel or the like, the support arm in its bent shape is located inside and is positioned towards the vessel. The induction coil winding is located outside. Thereafter, the induction coil together with its structure will be fixed to the cooking vessel, preferably by screws.

[0024] These and other features are evident not only from the claims but also from the description and the drawings, and each feature is realized individually or in multiple forms in subcombinations for use in embodiments and different fields of the invention and can become advantageous and independently protectable embodiments claimed here. The division of the application into individual sections and subheadings does not limit the general validity of the statements made thereunder. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 shows a structure according to the invention having eight support arms which are centrally connected to a central ring in a star-shaped configuration,

[0026] Figure 2 Shown are various holding openings Figure 1 one of the support arms, some of these holding openings being connected via longitudinal slots,

[0027] Figure 3 The induction coil according to the present invention is shown, which has a configuration Figure 1 The induction coil winding is divided into four separated circular rings.

[0028] Figure 4 A holding bracket for fixing the induction coil winding to the support arm is shown in side view,

[0029] Figure 5 Shows Figure 3 The induction coil, in which the induction coil winding utilizes Figure 4 The retaining bracket is fixed to the support arm,

[0030] Figure 6 The induction coil winding and the holding bracket are shown. Figure 2 An enlarged view of the support arm, wherein the retaining bracket is fixed in the longitudinal slot,

[0031] Figure 7 shows an enlarged and oblique view of two circular rings of the winding of the induction coil fixed to the support arm by means of retaining brackets in longitudinal slots,

[0032] Figure 8 Shown according to Figure 4 A side view of a holding bracket that secures the winding of the induction coil to the support arm,

[0033] Fig. 9 Shown is a bowl-type cooking vessel placed under the basis Figure 5 An oblique view of the flat-shaped induction coil.

[0034] Fig.10 A schematic diagram of a device having an induction coil and a support arm is shown. Fig. 9 A cooking vessel, wherein the induction coil winding is bent according to the shape of the vessel and fixed to the vessel,

[0035] Fig.11 An enlarged view of the upper region of one of the support arms is shown, wherein two rings of the induction coil winding are fixed to the support arm by means of a retaining bracket. DETAILED DESCRIPTION

[0036] exist Figure 1 In the figure, a plan view of a structure 11 according to the invention is shown. The structure 11 has eight support arms 13, which are made of flat metal and have a width of about 0.8 cm to 5 cm and a length between 10 cm and 60 cm. The support arms 13 are connected to a central ring 26 consisting of the same metal plate via an inner end 14. Such a connection can be formed via welding, screwing or rivets. In other embodiments not shown here, the support arms can be made into a single piece together with the central connection area or ring. Each support arm 13 has an outer free end 16, which is provided with a fixing hole 17 at the end. The fixing hole 17 is used to be mounted to the outside of the cooking vessel.

[0037] From the basis Figure 2 It can be seen from the enlarged view of the support arm 13 that two holding openings 18a are arranged at a certain distance from each other near the inner end 14. These holding openings 18a can be arranged in the central longitudinal direction of the support arm 13, or slightly offset.

[0038] At a distance from the two holding openings 18a, six further holding openings 18b are provided in the support arm 13. They are placed along a straight line parallel to the longitudinal direction of the support arm 13. The holding openings 18b are not so clearly distinguished or formed as a single and separate opening, but are formed as short slot sections 20 having a direction parallel to the longitudinal direction of the support arm 13. Alternatively, the holding openings 18b and the slot sections 20 may be regarded as one longitudinal opening.

[0039] From the groove section 20, the short connecting groove 21 leads to a long longitudinal groove 23, wherein the connecting groove 21 is arranged approximately at right angles to the other two grooves. The longitudinal groove 23 is parallel to the longitudinal direction of the support arm 13. It has a width approximately equal to the connecting groove 21 and the groove section 20, which can also approximately correspond to the diameter of the holding openings 18a and 18b, for example 2 mm to 4 mm. As in Figure 21 and 2. It can be seen that the shape and arrangement of the retaining opening 18b, the slot section 20 and the connecting slot 21 are each identical. The length of the connecting slot 21 is approximately two or three times the diameter of the retaining opening 18b. The distances of the individual retaining openings 18b from one another can vary, as can be seen because the distance between the two retaining openings 18b closest to the outer free end 16 of the support arm 13 is slightly greater than the distance between the other retaining openings, which can also be equidistant from one another. The retaining opening 18 and the slots 20, 21 and 23 can be manufactured into the metal sheet for the support arm 13 by stamping or die cutting, respectively.

[0040] from Figure 3 It can be seen from the view that the induction coil 30 according to the present invention is wound to Figure 1 The induction coil 30 is formed by a single layer of induction strands 31, which are customary for such induction coils. The winding sequence of the induction coil 30 may start with the inner end 32 of the strands 31, which may be wound in a clockwise spiral with the aid of corresponding winding equipment known in the art. A holder or the like, not shown here, may be provided to precisely position the strands 31 on the structure 11, wherein the support arms 13 assume a determined shape.

[0041] The induction coil 30 is wound into four rings 35a to 35d using strands 31. Each of these rings 35a to 35d can be composed of 5 to 20 or even 30 induction coil windings. A connecting strand 37ab leads from the innermost ring 35a to the next ring 35b. Radially outside thereof in the same region, a connecting strand 37bc leads from ring 35b to ring 35c. Another such connecting strand 37cd leads from ring 35c to the outermost ring 35d. As shown in FIG. Figure 3 As can be seen, the innermost ring 35a has more induction coil windings than the other three rings, about 50% more, which can also be seen from Figure 6 Of course, this number can vary according to the best winding configuration that seems suitable for the induction coil 30 for the corresponding heat distribution. The outer ends 33 of the strands 31 are led out from the outermost ring 35d. Subsequently, the two ends 32 and 33 can be connected to an inverter or any other power source known in the art.

[0042] In other embodiments of the invention, only one loop of induction strands is provided on the star structure. This single loop is held on each support arm by means of one holding bracket per support arm. These holding brackets may move along the support arm, as will be explained below, or may not move.

[0043] exist Figure 4, a side view of a single holding bracket 40 is shown. The holding bracket 40 can also be made of sheet metal, for example the same sheet metal as the structure 11, but can alternatively be made of other materials, such as plastic or any electrically insulating material. The holding bracket 40 has a wide holding section 42 with free ends 43 at both sides. Figure 8 As can be seen in the enlarged side view of the 40, the height of the retaining bracket 40 corresponds approximately to the thickness of the strand 31 plus 10% or 20%. At each free end 43, a rivet 45 is provided, wherein the rivet head 46 is positioned abutting against the free end 43. Alternatively, these can be screws or other fixing means, such as fastening pins, etc. The rivets 45 have not yet been punched for fixing.

[0044] exist Figure 5 In the view, according to Figure 4 The holding bracket 40 has been placed onto the rings 35a to 35d so as to overlap them and is fixed to the support arm 13. Figure 6 The enlarged view of the innermost and outermost retaining brackets 40 can be seen to be slightly longer than the other two. The reason for this is that the innermost ring 35a itself is very wide and wider than the other rings. The outermost ring 35d is as narrow as the other rings, but should have greater freedom of movement. The number of winding turns or the number of winding turns of each ring 35a to 35d depends on the thermal profile of the application for which the induction coil is provided.

[0045] Therefore, in this case, two types of retaining brackets 40 are provided. Alternatively, the retaining brackets 40 may all have the same length. This length should be such that each winding of the strand 31 is held in its final position. Ideally, the length of each bracket 40 should be the distance that the winding of the strand 31 will occupy in the final installation position, so that the strand 31 has minimal winding space or no winding space at all. The eight innermost retaining brackets 40 are fixed to the retaining opening 18a, which means that they hold the innermost ring 35a in a defined position. After the retaining brackets 40 are fixed to the support arm 13 by rivets 45, neither the ring 35a nor its retaining brackets 40 can move much or change their position. These rivets 45 are finally fixed to the support arm 13 by conventional stamping. This can be done in the following way, namely: the retaining bracket 40 is fixed to the support arm 13 with its free end 43.

[0046] Furthermore, three more retaining brackets 40 of circular rings 35b to 35d are also placed above each bundle of wire strands 31 of the induction coil winding and fixed to the support arm 13 by stamping using rivets 45 and rivet heads 46. Figure 6As can be seen, each rivet 45 is displaced in the radial direction from the retaining opening 18 b where it should ultimately be placed. They should also not be fixed too tightly to the support arm 13 with the rivets 45 so that they can move in the longitudinal slots 23 and along them.

[0047] from Figure 7 An oblique side view of Figure 8 The side view of the can also show how the holding bracket 40 and its holding section 42 hold the wire strands 31 of the induction coil 30 of the two rings 35c and 35d against the support arm 13. As explained above, this should be done in such a way that they are held in the shape of the rings 35 so that the wire strands 31 remain in one plane and are positioned next to each other. They should still be able to move in the radial direction relative to the support arm 13. In particular, Figure 8 As can be seen from the side view of FIG. 4 , the wire strands 31 held against the support arms 13 by the holding sections 42 should not have enough free space to move one above the other. Otherwise, this could disrupt the winding sequence of the induction coil 30 . Therefore, Figures 3 to 8 A method of manufacturing an induction coil 30 of the present invention is shown.

[0048] exist Fig. 9 In the embodiment, the induction coil 30 is placed below the cooking vessel 48 to which it is ultimately to be mounted. The induction coil 30 is placed in such a way that the rings 35a to 35d formed by the strands 31 are placed on the underside of the structure 11. Figure 1 The structure 11 is manufactured and based on Figure 5 The manufacturing of the induction coil 30 can be performed at a location different from the location where the induction coil 30 is mounted to the cooking vessel 48. The induction coil 30 can be easily packaged and transported in such a flat shape, thereby reducing the cost and workload of transportation. Figure 5 Another major advantage of the flat shape of the induction coils 30 is that they can be easily packaged in large quantities, for example by stacking them, to avoid any potential damage to them during their transportation and storage.

[0049] The induction coil 30 can be fixed to the underside of the cooking vessel 48 preferably by screws passing through the fixing holes 27 in the central ring 26 of the structure 11, which is not shown here but can be easily imagined. Thereafter, the induction coil 30 is spherically bent from its planar shape to correspond to the spherical shape of the cooking vessel 48. This bending of the support arm 13 can be performed manually or by machine, wherein the final position is Fig.10 Although during this bending of the induction coil 30, the innermost ring 35d does not bend very much near its position to the center of the cooking vessel 48 and its fixed position to the holding opening 18a by the holding bracket 40, the other rings 35b to 35d are bent relative to their Figure 5Specifically, they move radially outwards towards the outer free ends 16 of the support arms 13. This relative movement becomes increasingly greater from the rings 35b to the outermost rings 35d. During this movement, the strands 31 of the induction coil winding are held against the support arms 13 by the retaining brackets 40, which likewise move with their rivets 45 in and along the longitudinal grooves 23. Fig.10 In the final shape, each rivet 45 of the retaining bracket 40 moves from the longitudinal groove 23 through the connecting groove 21 and through the groove section 20 into the retaining opening 18b. Fig.11 See. For this final position, the retaining bracket 40 and its rivet 45 can be manually moved and positioned in the retaining opening 18b. It can be provided that, in the direction towards the center point of the induction coil 30, there is a certain tension applied to the strands 31 of the rings 35b to 35d, so that due to the shape and arrangement of the retaining opening 18b, the slot segments 20 and the connecting slots 21 to the longitudinal slots 23, the retaining bracket 40 is pulled by the strands 31 in the radially inward direction. This prevents any radial outward movement of the retaining brackets 40, thereby keeping them in the retaining opening 18b and therefore in the predetermined position. The outer free ends 16 of the support arms 13 are fixed to fixing lugs 49 close to the upper edge of the cooking vessel 48. For this purpose, fixing screws 51 can be fixed in the threads 50 of these fixing lugs 49.

[0050] The induction coil 30 is located on its outer side and fixed to its base Fig.10 The finished cooking vessel 48 can be installed accordingly in any cooking device or kitchen. The induction coil 30 in its final spherical form extends along the outside of the cooking vessel 48, at a predetermined distance from the cooking vessel 48, and in a predetermined circular ring 35a to 35d. Fig.10 and Figure 5 It is obvious from the comparison that the transportation and storage of the induction coil 30 in its final spherical form will be much more complicated.

[0051] The configuration of the structure 11 should be adapted to the final shape of the induction coil 30, which must likewise be adapted to the shape of the cooking vessel 48. Other configurations of the ring 35 of the induction coil 30 can be provided by varying the shape and position of the individual slots and holding openings 18 in the support arm 13. The holding bracket 40 is provided in two different lengths, wherein this can be simplified to only one type of holding bracket.

Claims

1. A structure for manufacturing an induction coil, the structure comprising: - at least four elongated support arms, said support arms being flat and bendable, - a central connecting part to which the support arms are fixed with the inner free ends, wherein the outer free ends are free, at least one holding bracket on each support arm, said holding bracket being elongated and extending in the longitudinal direction of said support arm at a distance above said support arm, so that in said distance between said holding bracket and said support arm there is space for a plurality of turns of induction wire strands of an induction coil, - at least two or more holding openings for said at least one holding bracket arranged on each support arm and positioned along said longitudinal direction of said support arm, - Each holding bracket can be fastened in the holding opening at its two ends by means of fastening means.

2. The structure according to claim 1, wherein: - at least one longitudinal groove is provided on each support arm along its longitudinal direction, - each retaining opening is connected to the corresponding longitudinal slot by means of a short connecting slot, - the retaining bracket is held in a first fastening position on the longitudinal groove as an assembly / transport position, The holding bracket is held in the holding opening in a second fastening position as an end position, which is different from the first fastening position.

3. The structure according to claim 2, wherein: Each support arm is provided with a single longitudinal slot.

4. The structure according to claim 3, wherein: The longitudinal slot extends parallel to the longitudinal direction of the support arm.

5. The structure according to claim 1, wherein: At least two holding brackets are arranged on each support arm.

6. The structure according to claim 1, wherein: The fastening means is a fastening pin or a rivet.

7. The structure according to claim 2, wherein: A short slot section leads from each retaining opening connected to the longitudinal slot in a direction away from the retaining opening.

8. The structure according to claim 7, wherein: The short groove section extends parallel to the longitudinal groove, and the connecting groove opens from the groove section at an angle to the longitudinal groove, wherein the short connecting groove is at least as long as the width of the longitudinal groove.

9. The structure according to claim 2, wherein: At least two holding openings are provided on one support arm and are connected to the longitudinal slot.

10. The structure according to claim 1, wherein: All support arms are formed identically and are circumferentially fastened to the connection part in a circumferentially identical orientation, wherein the support arms protrude from the connection part in a radial direction.

11. The structure according to claim 1, wherein: The holding bracket is fastened at its free end to the support arm by means of a screw-like or rivet-like fastening pin.

12. The structure according to claim 11, wherein: The holding brackets have a wide holding section between their free ends, each holding bracket holding a plurality of four to thirty induction wire strands in place on the support arm as an induction coil winding of the induction coil.

13. The structure according to claim 11, wherein: The fastening pin passes through the support arm and wherein all holding brackets are applied to the support arm from one side and fastened from the other side.

14. The structure according to claim 13, wherein: The holding bracket with the fastening pins can be displaced along the longitudinal groove, and the distance between the fastening pins on one holding bracket in the longitudinal direction of the longitudinal groove corresponds to the distance of the holding openings.

15. An induction coil comprising an induction coil winding of an induction wire strand and a structure according to claim 1, the induction coil winding being positioned on the structure, wherein: The induction coil is helically wound into a plurality of rings of different diameters, and each ring of the induction coil winding abuts against a support arm, and its abutment against the support arm is fixed in this region by means of a retaining bracket.

16. The induction coil according to claim 15, wherein The induction coil is spirally wound into a plurality of rings of different diameters, and the induction coil is wound into a single layer.

17. The induction coil according to claim 15, wherein: The induction coil is wound from a single continuous induction strand having inner and outer ends formed by a start and end portion of the induction strand, respectively, and having the induction coil winding therebetween.

18. The induction coil according to claim 15, wherein: The induction coil comprises at least two partial induction coils, each of which is electrically connectable independently of the other partial induction coils.

19. The induction coil according to claim 18, wherein Each partial induction coil is formed by at least one circular loop and each partial induction coil has two electrical connections.

20. A method of manufacturing the induction coil according to claim 15 using the structure according to claim 1, wherein: Perform the following steps: - providing a structure according to claim 1 in a plane, - positioning the induction strand on the structure or on a supporting arm of the structure, wherein the induction strand is wound on a radially inner holder and each new induction coil winding is applied to an existing induction coil winding, wherein the induction coil is wound into at least two rings spaced apart from each other, - Attaching a holding bracket for fastening the induction coil winding of the induction wire strand to the support arm.

21. The method according to claim 20, wherein: Attaching the holding bracket for securing the induction coil winding of the induction wire strand to the support arm is performed after the winding of each ring is completed and before the winding of the next ring begins.

22. The method according to claim 20, wherein: After all holding brackets have been attached, the induction coil is spherically bent or curved from a planar shape into a curved shape in such a way that the holding brackets and the induction wire strands held by them are moved from a first position along the longitudinal grooves according to claim 2 via the connecting grooves to a second position in the holding opening.

23. The method according to claim 22, wherein: The support arm in the bent shape is located on the inside and the induction coil winding is located on the outside.

24. The method according to claim 23, wherein: The induction coil together with the structure is then fixed or screwed to the cooking vessel.

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