Cooktop device, cooktop and methods using a cooktop device

Abstract

Cooktop device with at least one coil carrier (10) which is provided for supporting at least one heating coil (12), with at least one ferrite element (14) and with at least one retaining element (16) which is provided for being connected to the coil carrier (10) and for supporting the ferrite element (14) and which has at least one compensating element (18) which is provided for compensating for manufacturing tolerances of the ferrite element (14), characterized in that the retaining element (16) and the coil carrier (10) comprise cooperating fastening elements (20, 22) which are provided for fastening the retaining element (16) to the coil carrier (10), wherein the cooperating fastening elements (20, 22) are provided for indirectly fastening the ferrite element (14) to the coil carrier (10).

Description

[0001] Induction cooktops are known from the prior art, comprising a heating coil, a coil carrier for supporting the heating coil and a ferrite element, wherein the ferrite element is connected to the coil carrier by means of a silicone adhesive.

[0002] Furthermore, induction cooktops are known that comprise a heating coil, a coil carrier for supporting the heating coil, a ferrite element, and a retaining element. In this case, the retaining element is designed to at least partially fix the ferrite element to the coil carrier.

[0003] Documents EP 2 473 001 A1 and JP 2005 - 190 753 A each describe a coil support that carries an induction coil and on whose back ferrites are arranged. An adhesive ensures a direct, metallurgical bond between the coil support and the ferrite element.

[0004] The object of the invention is, in particular, to provide a cooktop device with improved tolerance compensation properties. This object is achieved by the features of claim 1, while advantageous embodiments and further developments of the invention can be found in the dependent claims.

[0005] A cooktop device, in particular an induction cooktop device, is proposed, comprising at least one coil carrier designed to support at least one heating coil, at least one ferrite element, and at least one retaining element designed to be connected to the coil carrier and to support the ferrite element, and which includes at least one compensating element designed to compensate for and / or offset manufacturing tolerances of the ferrite element, in particular with respect to a normal direction to a principal extension plane of the ferrite element. In this context, the term "cooktop device" shall be understood to mean, in particular, at least one part, in particular a subassembly, of a cooktop, in particular an induction cooktop. In particular, the cooktop device may also comprise the entire cooktop, in particular the entire induction cooktop.In particular, the cooktop device can comprise at least one heating coil. A "heating coil" is understood to mean, in particular, an inductive element, which consists, in particular, of at least one, preferably exactly one, heating conductor and has, in particular, at least two, advantageously at least five, preferably at least ten, and particularly preferably at least twenty windings, especially in one plane and / or advantageously in several planes. Viewed from above, the heating coil can, in particular, have a rectangular, an oval, and / or preferably a circular shape and / or contour.The heating coil is specifically designed to generate an alternating electromagnetic field, particularly with a frequency between 20 kHz and 100 kHz, which is specifically intended to be converted into heat in a raised, particularly metallic, preferably ferromagnetic, cookware base by means of eddy current and / or remagnetization effects. "Designed" is understood to mean specifically designed and / or equipped. The fact that an object is intended for a specific function is understood to mean, in particular, that the object fulfills and / or performs this specific function in at least one application and / or operating condition.

[0006] In this context, a "coil carrier" shall be understood to mean, in particular, a unit comprising at least one, in particular cylindrical, preferably circular cylindrical, carrier roller and, in particular, at least one side boundary element, advantageously at least two, more preferably exactly two, side boundary elements. The carrier roller and the at least one side boundary element and / or the at least two side boundary elements, in particular, at least partially and preferably to at least a large extent, define at least one heating coil receiving area, which is specifically designed to receive, in an assembled state, the heating conductor forming the heating coil and / or at least one heating coil, preferably exactly one heating coil. Preferably, the coil carrier is formed in one piece.The coil carrier can be formed at least partially, preferably to a large extent, and particularly preferably entirely from any material deemed suitable by a person skilled in the art, such as a ceramic and / or a plastic, in particular a high-temperature plastic, preferably a polyphenylene sulfide (PPS) and / or particularly preferably a liquid crystal polymer (LCP). The term "to a large extent" shall be understood to mean, in particular, at least 60%, advantageously at least 70%, preferably at least 80%, and particularly preferably at least 90%. In this context, "one-piece" shall be understood to mean, in particular, at least a material bond. The material bond can be achieved, for example, by an adhesive bonding process, an injection molding process, and / or another process deemed suitable by a person skilled in the art.Advantageously, the term "one-piece" is understood to mean molded in a single piece. This single piece is preferably manufactured from a single blank, particularly preferably by an injection molding process, especially a single- and / or multi-component injection molding process. In this context, "high-temperature plastic" is understood to mean, in particular, a plastic that has a continuous operating temperature of at least 150°C and preferably at least 200°C. "Ferrite element" is understood to mean, in particular, a ferrimagnetic element designed to guide and / or adapt, preferably increase, an electromagnetic field, especially that of the heating coil. The ferrite element is preferably formed in one piece. The material thickness of the ferrite element is, particularly disregarding manufacturing tolerances, between 2 mm and 7 mm, and advantageously between 3 mm and 6 mm.The manufacturing tolerances of the ferrite element are, in particular, between 0.1 mm and 0.5 mm. The ferrite element can consist at least partially, preferably to a large extent, and especially preferably entirely of any material that would be suitable to a person skilled in the art, in particular a ferrimagnetic material, such as a metal oxide, in particular magnetite, and / or the iron oxide hematite.

[0007] The retaining element is preferably formed in one piece. The retaining element can consist at least partially, preferably to a large extent, and particularly preferably entirely of any material that would be considered suitable by a person skilled in the art, such as a ceramic and / or a plastic, in particular a high-temperature plastic, preferably a liquid crystal polymer (LCP) and / or particularly preferably a polyphenylene sulfide (PPS). Furthermore, the term "compensating element" is understood to mean, in particular, an element that is preferably at least partially elastic and / or deformable.In this context, a "partially elastic object" shall be understood to mean, in particular, an object, preferably a self-resetting object, that has at least a partial area which, in a normal operating state, is elastically deformable in its position by at least 0.2 mm, advantageously by at least 0.5 mm, preferably by at least 1 mm, and particularly preferably by at least 2 mm, and which, in particular, generates a counterforce that is dependent on a change in position and preferably proportional to the change, and which, in particular, counteracts the change. In particular, the elastic object is repeatedly deformable, in particular at least 100 times, preferably at least 500 times, and, in particular, without damage, and, in particular, tends to return to its basic shape independently after deformation.The retaining element could have any number of compensating elements, such as at least two, at least three, and / or at least four compensating elements. At least one compensating element could, for example, be designed as a polymer, an elastomer, a silicone element, and / or a spring, in particular a compression spring. Preferably, however, the retaining element has exactly one compensating element.

[0008] The retaining element, the ferrite element, and / or the coil support can, particularly when viewed perpendicular to a principal plane of extension of the retaining element, the ferrite element, and / or the coil support, have any shape and / or contour that appears sensible to a person skilled in the art, such as a rectangular, oval, circular, and / or honeycomb shape and / or contour. The mean diameter of the retaining element, the ferrite element, and / or the coil support, particularly when viewed perpendicular to a principal plane of extension of the retaining element, the ferrite element, and / or the coil support, is in particular at least 30 mm, preferably at least 40 mm, and particularly preferably at least 50 mm, and in particular a maximum of 100 mm, preferably a maximum of 85 mm, and particularly preferably a maximum of 75 mm.Particularly preferably, the retaining element, the ferrite element, and / or the coil support have the same shape, contour, and / or mean diameter when viewed perpendicular to a principal extension plane of the retaining element, the ferrite element, and / or the coil support. In this context, a "principal extension plane" of an object is understood to be, in particular, a plane that is parallel to a largest face of a smallest imaginary cuboid that just completely encloses the object and, in particular, passes through a center point, especially a geometric center point, of the cuboid. A "mean diameter" of an object is understood to be, in particular, the diameter of a smallest, especially imaginary, circle that just completely encloses the object. Advantageously, the cooktop can also be designed as a matrix cooktop.In this case, the cooktop device can have at least two, advantageously at least four, preferably at least six, more preferably at least twelve, and particularly advantageously at least twenty-four coil carriers, heating coils, ferrite elements, and / or retaining elements, preferably identical to one another. This design allows for a cooktop device with improved tolerance compensation, particularly for manufacturing tolerances of the ferrite element. Furthermore, it allows for a cooktop device with increased flexibility and / or stability. Additionally, it advantageously reduces complexity, especially in the manufacturing process, thereby reducing assembly effort. This results in significant time savings. Moreover, it reduces costs, particularly due to a lower reject rate.

[0009] Preferably, the retaining element is integrally connected to the compensating element, particularly by a material bond. This simplifies assembly and improves stability.

[0010] If the retaining element and the compensating element are identically designed, components and, consequently, costs can be reduced.

[0011] Furthermore, it is proposed that the retaining element and / or the compensating element be slotted. The slot can have a width of between 0.5 mm and 8 mm, preferably between 1 mm and 7 mm, and most preferably between 1.5 mm and 6 mm. This can, in particular, increase the flexibility of the retaining element and / or reduce its bending stiffness.

[0012] Preferably, the retaining element and / or the compensating element has a material thickness of at least 0.1 mm, preferably at least 0.25 mm, and particularly preferably at least 0.5 mm and a maximum of 2.5 mm, preferably a maximum of 1.5 mm, and particularly preferably a maximum of 1 mm. This can further improve the flexibility and / or stability of the cooktop device.

[0013] According to the invention, it is proposed that the retaining element and the coil carrier comprise cooperating fastening elements, which are provided for a fastening of the retaining element to the coil carrier, in particular by friction and / or positive locking, wherein the cooperating fastening elements are provided for an indirect fastening of the ferrite element to the coil carrier. Indirect fastening of the ferrite element means a friction-fit and / or positive locking fastening, but in any case not a material-fit fastening. In particular, the retaining element and the coil carrier each have at least one of the fastening elements. Alternatively, the retaining element and / or the coil carrier can also have several fastening elements. This allows, in particular, a simple and advantageously detachable connection between the retaining element and the coil carrier to be achieved.

[0014] Furthermore, it is proposed that the cooperating fastening elements be designed as bayonet locking elements. In this case, the retaining element is intended to be connected to the coil carrier by means of a bayonet connection. This allows, in particular, a quick and easy connection between the retaining element and the coil carrier.

[0015] Furthermore, it is proposed that the ferrite element be flat, apart from manufacturing tolerances. In particular, the ferrite element is at least substantially planar. An "at least substantially planar" design of an object is understood to mean, in particular, a design of the object in which a minimal, imaginary cuboid just enclosing the object has a longest edge that is at least 5 times, in particular at least 10 times, preferably at least 15 times, and particularly advantageously at least 20 times as long as the shortest edge of the cuboid. In particular, the ferrite element has, apart from manufacturing tolerances, a material thickness that is at least substantially constant.In this context, "at least substantially constant" material thickness of an object shall be understood to mean, in particular, a material thickness that deviates from the average material thickness of the object by no more than 10%, preferably no more than 5%, and most preferably no more than 2%. This can, in particular, reduce the complexity of the ferrite element. Furthermore, it can advantageously increase the power efficiency, especially the heating efficiency, of the cooktop device, particularly since the distance between the heating coil and the ferrite element can be minimized.

[0016] If the compensating element has at least one ferrite support element designed to press the ferrite element against the coil carrier, manufacturing tolerances can be advantageously compensated and, in particular, high stability can be achieved simultaneously. In this way, ferrite elements with a reduced material thickness compared to a reference material thickness can be advantageously and securely pressed against the coil carrier. A "ferrite support element" is understood to be, in particular, an element designed to contact and / or support the ferrite element, especially in a mounted state. The ferrite support element is advantageously designed as a rectangular, circular, oval, cylindrical, and / or truncated pyramidal protrusion, particularly relative to the compensating element and / or the retaining element.The ferrite support element advantageously consists at least partially, preferably to a large extent, and particularly preferably entirely of a ceramic and / or a plastic, in particular a high-temperature plastic, preferably a liquid crystal polymer (LCP) and / or particularly preferably a polyphenylene sulfide (PPS). Alternatively, it is conceivable that the ferrite support element consists at least partially of an elastic and / or deformable element. The ferrite support element can, for example, be designed as a polymer, an elastomer, a silicone element, and / or a spring, in particular a compression spring. Preferably, the compensating element has at least two, preferably at least three, and particularly preferably at least four ferrite support elements. Advantageously, the ferrite support element and the compensating element are formed in one piece. Particularly preferably, the ferrite support element, the compensating element, and the retaining element are formed in one piece.

[0017] According to the invention, it is proposed that the ferrite element is attached to the coil carrier indirectly, only by means of a form-fit and / or force-fit connection, and not by a material bond, such as with a silicone adhesive and / or adhesive tape. This advantageously reduces assembly time, as the curing of an adhesive, which is particularly time-consuming, can be avoided and / or eliminated entirely.

[0018] Furthermore, a method is proposed for a cooktop device, in particular an induction cooktop device, which has at least one coil carrier for supporting at least one heating coil, at least one ferrite element, and at least one retaining element for connecting to the coil carrier and supporting the ferrite element. The retaining element has at least one compensating element, and manufacturing tolerances of the ferrite element, in particular with respect to a normal direction to a principal extension plane of the ferrite element, are compensated by means of the compensating element. This allows for advantageous tolerance compensation and provides a cooktop device with improved flexibility, stability, and / or assembly efficiency.

[0019] The cooktop device is not to be limited to the application and embodiment described above. In particular, the cooktop device may, to fulfill a function described herein, have a different number of individual elements, components, and units than specified herein.

[0020] Further advantages will become apparent from the following description of the drawing. The drawing illustrates an embodiment of the invention. The drawing, the description, and the claims contain numerous features in combination. A person skilled in the art will expediently consider the features individually and combine them into meaningful further combinations.

[0021] They show: Fig. 1 a cooktop designed as an induction cooktop with a cooktop device in a top view, Fig. 2 a coil carrier of the hob device in a perspective view, Fig. 3 a ferrite element of the cooktop device in a perspective view, Fig. 4 a holding element and / or a compensating element of the cooktop device with several ferrite support elements in a perspective view, Fig. 5 the coil carrier, the ferrite element and the retaining element and / or the compensating element in a partially assembled state, Fig. 6 the coil carrier, the ferrite element and the retaining element and / or the compensating element in an assembled state and Fig. 7 the coil support, the ferrite element and the retaining element and / or the compensating element in a sectional view along line VII-VII in Fig. 6.

[0022] Fig. Figure 1 shows an exemplary induction cooktop 26 in a schematic top view. In this case, the cooktop 26 is designed as a matrix cooktop. The cooktop 26 has a variable cooktop plate with adjustable heating zones. Furthermore, the cooktop 26 includes a cooktop unit. In this case, the cooktop unit has 48 heating units 28. The heating units 28 are identical to each other. Fig. Figures 2 to 7 describe, by way of example, the construction of one of the heating units 28 of the hob device.

[0023] The hob device includes a coil carrier 10 (see Fig. 2) In particular, the heating unit 28 comprises the coil carrier 10. The coil carrier 10 is made of a liquid crystal polymer. The coil carrier 10 is formed in one piece. The coil carrier 10 has a wall thickness between 0.4 mm and 1 mm. Furthermore, the coil carrier 10 has a support roller 30. The support roller 30 has a circular cylindrical shape in a top view. The support roller 30 is designed as a hollow cylinder. Furthermore, the coil carrier 10 has a first side limiting element 32. The first side limiting element 32 has a circular shape in a top view. In this case, the first side limiting element 32 has a diameter of approximately 70 mm. In addition, the coil carrier 10 has a second side limiting element 34. The second side limiting element 34 has a honeycomb shape in a top view. In this case, the second side limiting element 34 has a mean diameter of approximately 75 mm.Furthermore, the second side boundary element 34 includes a cable guide channel 48. The cable guide channel 48 is arranged on a side of the second side boundary element 34 facing away from the first side boundary element 32. The cable guide channel 48 extends radially from a central area of ​​the coil carrier 10 to an edge area of ​​the coil carrier 10. The cable guide channel 48 is designed to guide various supply lines when assembled. The support roller 30 and the side boundary elements 32, 34 at least partially define a heating coil receiving area 36. Alternatively, a first and / or a second side boundary element could also have the same and / or a different shape, particularly in a top view.

[0024] Furthermore, the coil carrier 10 has a first fastening element 20 (see in particular Fig. 5) The first fastening element 20 is arranged centrally and, in particular, concentrically on the second side limiting element 34. The first fastening element 20 is arranged on a side of the second side limiting element 34 facing away from the support roller 30 and / or the first side limiting element 32. In this case, the first fastening element 20 is designed as a first bayonet locking element. Alternatively, it is conceivable to design a first fastening element as a snap-fit ​​element and / or screw element.

[0025] The hob device also includes a heating coil 12 (see Fig. 6 and Fig. 7) In particular, the heating unit 28 comprises the heating coil 12. The heating coil 12 consists of exactly one heating cable. The heating coil 12 has 20 windings. In a top view, the heating coil 12 has a circular shape. In its assembled state, the heating coil 12 is arranged in the heating coil mounting area 36. Accordingly, the coil carrier 10 is designed to support the heating coil 12. The heating cable is wound around the carrier roller 30, thus forming the heating coil 12. Furthermore, the heating coil 12 comprises at least two connection contacts (not shown). The connection contacts are designed to supply the heating coil 12 with an electric current. The heating coil 12 is designed to heat cookware by means of eddy current and / or remagnetization effects.

[0026] Furthermore, the cooktop device includes a ferrite element 14 (see below). Fig. 3) In particular, the heating unit 28 comprises the ferrite element 14. The ferrite element 14 is made of a high-performance ferrite material. In this case, the ferrite element 14 consists of 3C90. Alternatively, it is conceivable that a ferrite element consists of 3C91, 3C92, 3C93, 3C94, 3C95, 3C96, and / or 3C97. The ferrite element 14 is formed in one piece. The ferrite element 14 is formed at least substantially planar. The ferrite element 14 is flat, except for manufacturing tolerances. Accordingly, the ferrite element 14 has a material thickness that is at least substantially constant, except for manufacturing tolerances. The material thickness of the ferrite element 14 is approximately 5 mm in this case. The ferrite element 14 has a honeycomb shape in a top view. The ferrite element 14 has a mean diameter of approximately 75 mm in this case. In addition, the ferrite element 14 has a central recess 38.The recess 38 has a circular shape in plan view. The recess 38 has a diameter between 10 mm and 25 mm. In this case, the recess 38 has a diameter of approximately 20 mm. Furthermore, the ferrite element 14 is slotted. Accordingly, the ferrite element 14 has a slot 40. The slot 40 extends radially from the central recess 38 to an edge region of the ferrite element 14. The slot 40 has a width of approximately 12 mm.

[0027] Furthermore, the cooktop device includes a retaining element 16 (see Fig. 4) In particular, the heating unit 28 comprises the retaining element 16. The retaining element 16 has a compensating element 18. In the present case, the retaining element 16 and the compensating element 18 are identical. Consequently, the retaining element 16 and the compensating element 18 form the same component. Alternatively, however, it is also conceivable to form a retaining element and a compensating element in two parts. In this case, the compensating element could, for example, be designed as an elastic element, in particular as a polymer, an elastomer, a silicone element and / or a spring, and preferably be integrally connected, for example by a material bond, to the retaining element, in particular to a side of the retaining element facing a coil carrier.

[0028] The retaining element 16 is at least substantially dimensionally stable. The retaining element 16 is made of polyphenylene sulfide. The retaining element 16 is formed in one piece. In this case, the retaining element 16 consists of a single piece. The retaining element 16 has a constant material thickness. The material thickness of the retaining element 16 is approximately 0.5 mm in this case. The retaining element 16 has a honeycomb shape in a top view. The retaining element 16 has a mean diameter of approximately 75 mm in this case. In addition, the retaining element 16 has a central further recess 42. The further recess 42 has a shape that is at least substantially circular in a top view. The further recess 42 has a mean diameter between 10 mm and 25 mm. The further recess 42 has a mean diameter of approximately 20 mm in this case. Furthermore, the retaining element 16 is slotted.Accordingly, the retaining element 16 has a further slot 44. This further slot 44 extends radially from the further recess 42 to an edge region of the retaining element 16. The further slot 44 has a width of approximately 5 mm.

[0029] The retaining element 16 is designed to support the ferrite element 14. Furthermore, the retaining element 16 is designed to connect the ferrite element 14 to the coil carrier 10 and, in particular, to press it against the coil carrier 10. For this purpose, the retaining element 16 has a second fastening element 22. The second fastening element 22 is designed to correspond to the first fastening element 20. The second fastening element 22 defines the further recess 42. The second fastening element 22 is therefore arranged centrally and, in particular, concentrically on the retaining element 16. In this case, the second fastening element 22 is designed as a second bayonet locking element. Alternatively, it is conceivable to design a second fastening element as a snap-fit ​​element and / or screw element. The cooperating fastening elements 20 and 22 are designed to fasten the retaining element 16 to the coil carrier 10.Accordingly, the retaining element 16 and the coil carrier 10 are connected to each other by a bayonet connection in an assembled state. In this process, positive locking elements of the second fastening element 22 of the retaining element 16 engage with positive locking elements of the first fastening element 20 of the coil carrier 10, particularly through rotation of the retaining element 16 and / or the coil carrier 10. Furthermore, the cooperating fastening elements 20, 22 are provided for the indirect fastening of the ferrite element 14 to the coil carrier 10. The ferrite element 14 is attached to the coil carrier 10 only by positive locking and / or force locking, and not by material bonding. In particular, the entire heating unit 28 is free of adhesive in this case.

[0030] Furthermore, the retaining element 16 and / or the compensating element 18 has four ferrite support elements 24. The ferrite support elements 24 are arranged on a side of the retaining element 16 facing the coil carrier 10. In this case, the ferrite support elements 24 are integrally connected to the retaining element 16. The ferrite support elements 24 are therefore made of polyphenylene sulfide. The ferrite support elements 24 are uniformly distributed on a surface of the retaining element 16. The ferrite support elements 24 are designed as protrusions relative to the retaining element 16. In this case, the ferrite support elements 24 are rectangular. The ferrite support elements 24 are designed to press the ferrite element 14 against the coil carrier 10.Alternatively, at least one ferrite support element could also be made of a different material, in particular plastic, and / or be designed as an elastic element, in particular as a polymer, as an elastomer, as a silicone element and / or as a spring.

[0031] Furthermore, the retaining element 16 has at least one fixing element 46. In the present case, the retaining element 16 has four fixing elements 46. The fixing elements 46 are arranged on a side of the retaining element 16 facing away from the coil carrier 10. In the present case, the fixing elements 46 are integrally connected to the retaining element 16. The fixing elements 46 are therefore made of polyphenylene sulfide. The fixing elements 46 are evenly distributed on another surface of the retaining element 16 (see in particular Figure 1). Fig. 5) The fixing elements 46 are at least substantially cylindrical. Furthermore, the fixing elements 46 are elongated and have a principal extension direction that is perpendicular to a principal extension plane of the retaining element 16. In the present case, two of the fixing elements 46 are designed as locking elements. The fixing elements 46 are intended to fasten the retaining element 16 and / or the ferrite element 14 and / or the coil carrier 10 to a support unit (not shown). The retaining element 16 is therefore, apart from the fixing elements 46, at least substantially planar. Alternatively, it is conceivable to design all fixing elements as locking elements. Furthermore, a retaining element could have a different number of fixing elements, such as at least one fixing element and / or at least two fixing elements.

[0032] The Fig. 5, Fig. 6 and Fig. Figure 7 shows the coil carrier 10, the ferrite element 14 and the retaining element 16 and / or the compensating element 18 in a partially assembled state (see Figure 7). Fig. 5), in a fully assembled state (see Fig. 6) and in a sectional view along line VII-VII in Fig. 6 (cf. Fig. 7).

[0033] This shows in particular Fig. 6, that the retaining element 16, the ferrite element 14 and the coil carrier 10, in particular the second side limiting element 34, have the same contour and the same mean diameter in a top view. Furthermore, the ferrite element 14 is arranged between the retaining element 16 and the coil carrier 10, in particular the second side limiting element 34, in the assembled state.

[0034] The retaining element 16 and / or the compensating element 18 and the ferrite support elements 24 are designed in this case to compensate for manufacturing tolerances in the production of the ferrite element 14, which can amount to several hundred micrometers. The additional slot 44 of the retaining element 16 is designed to reduce the bending stiffness of the retaining element 16. This makes the retaining element 16 at least partially elastic. Therefore, a position of an edge region of the retaining element 16, as is particularly relevant in Fig.As indicated in Figure 7, the ferrite element 14 can vary relative to a central area of ​​the retaining element 16 by at least 2 mm in at least one direction perpendicular to a principal extension plane of the retaining element 16. This effectively compensates for manufacturing tolerances of the ferrite element 14, particularly without causing the relatively inelastic material of the retaining element 16 to break. Furthermore, the ferrite support elements 24 are designed to securely press the ferrite element 14 against the coil carrier 10, despite any manufacturing tolerances. Additionally, the ferrite support elements 24 allow ferrite elements with a reduced material thickness compared to a reference material thickness to be securely pressed against the coil carrier 10. Reference sign 10 coil carriers 12 Heating coil 14 Ferrite element 16 retaining element 18 Compensating element 20 fastening elements 22 Fastening element 24 Ferrite support element 26 hob 28 heating units 30 carrier roller 32 Page boundary element 34 Side boundary element 36 Heating coil mounting area 38 Exclusion 40 slots 42 Exclusion 44 slots 46 Fixing element 48 cable routing channel

Claims

[1] Hob device with at least one coil carrier (10) which is provided to support at least one heating coil (12), with at least one ferrite element (14) and with at least one retaining element (16) which is provided to be connected to the coil carrier (10) and to support the ferrite element (14) and which has at least one compensating element (18) which is provided to compensate for manufacturing tolerances of the ferrite element (14), characterized by , that the retaining element (16) and the coil carrier (10) comprise cooperating fastening elements (20, 22) which are provided for fastening the retaining element (16) to the coil carrier (10), wherein the cooperating fastening elements (20, 22) are provided for indirectly fastening the ferrite element (14) to the coil carrier (10). [2] Hob device according to claim 1, characterized by , that the retaining element (16) is integrally connected to the compensating element (18). [3] Hob device according to claim 1 or 2, characterized by , that the retaining element (16) and the compensating element (18) are identical in design. [4] Hob device according to one of the preceding claims, characterized by , that the retaining element (16) is slotted. [5] Hob device according to one of the preceding claims, characterized by , that the retaining element (16) has a material thickness of at least 0.1 mm and of a maximum of 2.5 mm. [6] Hob device according to one of the preceding claims, characterized by , that the cooperating fastening elements (20, 22) are designed as bayonet locking elements. [7] Hob device according to one of the preceding claims, characterized by , that the ferrite element (14) is flat apart from manufacturing tolerances. [8] Hob device according to one of the preceding claims, characterized by, that the compensating element (18) has at least one ferrite support element (24) which is designed to press the ferrite element (14) against the coil carrier (10). [9] Hob device according to any one of the preceding claims, characterized by , that the ferrite element (14) is attached to the coil carrier 10 only by means of a form-fit and / or force-fit connection. [10] Hob (26) with at least one hob device according to one of the preceding claims. [11] Method with a cooktop device, in particular according to one of claims 1 to 9, which has at least one coil carrier (10) for supporting at least one heating coil (12), at least one ferrite element (14) and at least one retaining element (16) for connecting to the coil carrier (10) and for supporting the ferrite element (14), wherein the retaining element (16) has at least one compensating element (18) and manufacturing tolerances of the ferrite element (14) are compensated by means of the compensating element (18), wherein the retaining element (16) and the coil carrier (10) comprise cooperating fastening elements (20, 22) which fasten the retaining element (16) to the coil carrier (10), wherein the cooperating fastening elements (20, 22) indirectly fasten the ferrite element (14) to the coil carrier (10).

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