Cooktop device, cooktop and method for mounting a cooktop device

Abstract

Cooktop device with at least one heating coil (10a; 10b), with at least one ferrite element (12a; 12b) and with at least one support unit (14a; 14b) which has at least one coil holder (16a; 16b) which is provided for holding the heating coil (10a; 10b) at least partially, and which has at least one ferrite holder (18a; 18b) which is provided for holding the ferrite element (12a; 12b) at least partially, wherein a minimum distance between the heating coil (10a; 10b) and the ferrite element (12a; 12b) is at most 0.8 mm at least in the immediate vicinity of an inner surface (20a; 20b) of the heating coil (10a; 10b), characterized in that the coil holder (16a; 16b) has a support roller (38a; 38b) and that the The heating coil (10a; 10b) is formed by a heating cable that is wound around the carrier roller (38a; 38b).

Description

[0001] The invention relates to a cooktop device according to the preamble of claim 1, a cooktop with such a cooktop device and a method for mounting a cooktop device according to claim 11.

[0002] Induction cooktops are known from the prior art, comprising a heating coil, a coil holder for holding the heating coil, a ferrite element with at least one central recess for defining a mounting position, and a ferrite holder for holding and fixing the ferrite element. The coil holder forms a receiving area for the heating coil, while the ferrite element is connected to the underside of the coil holder by a force-fit, form-fit, and / or material-fit connection. Due to the brittle plastic used and / or the recess of the ferrite element, the material thickness of the coil holder is at least 1 mm, ensuring a distance of at least 1 mm between the heating coil and the ferrite element, at least in a central area of ​​the heating coil.Reducing the material thickness of the coil holder would, particularly due to the way the ferrite element is attached, lead to a decrease in the stability of the coil holder, which would mean that a secure hold and / or an exact mounting position of the heating coil and / or the ferrite element could no longer be guaranteed.

[0003] Document US 5 428 207 A discloses an induction cooktop with an induction coil in the form of a flat, ring-shaped plate with magnetic return means arranged underneath.

[0004] Document CN 2 01 764 557 U discloses an induction cooktop with a spiral arrangement of a heating conductor on a support.

[0005] The object of the invention is, in particular, to provide a cooktop device of the generic type with improved efficiency characteristics. This object is achieved by the characterizing features of claim 1 and by the features of claim 11, while advantageous embodiments and further developments of the invention can be found in the dependent claims.

[0006] The invention relates to a cooktop device, in particular an induction cooktop device, with at least one heating coil, with at least one ferrite element and with at least one support unit, which has at least one coil holder which is provided to hold the heating coil at least partially, and which has at least one ferrite holder which is provided to hold the ferrite element at least partially, in particular to support it.

[0007] According to the invention, the minimum distance between the heating coil and the ferrite element, particularly in an assembled state, is at most 0.8 mm, advantageously at most 0.5 mm, and preferably at most 0.3 mm, at least in the immediate vicinity of the inner surface of the heating coil, and particularly at any point in the immediate vicinity of the inner surface of the heating coil. According to the invention, the coil holder has a support roller, and the heating coil is formed by a heating conductor wound around the support roller.

[0008] In this context, the term "cooktop device" shall be understood to mean, in particular, at least a part, especially a subassembly, of a cooktop, particularly an induction cooktop. In particular, the cooktop device may also comprise the entire cooktop, especially the entire induction cooktop. Advantageously, the cooktop may also be designed as a matrix cooktop. In this case, the cooktop device may, in particular, have at least two, advantageously at least four, preferably at least six, more preferably at least twelve, and most advantageously at least twenty-four, preferably identically designed, coil holders, heating coils, ferrite elements, and / or ferrite holders.The term "heating coil" shall be understood to mean, in particular, an element, especially an inductive element, which consists in particular of at least 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. The heating coil is designed in particular to generate an alternating electromagnetic field, in particular with a frequency between 20 kHz and 100 kHz, which is designed in particular to be converted into heat in a raised, in particular metallic, preferably ferromagnetic, cookware base by means of eddy current and / or remagnetization effects.In particular, the heating coil is at least substantially ring-shaped, advantageously annular, and has, in particular, an inner surface arranged perpendicular to a principal plane of extension of the heating coil and, in particular, an outer surface arranged perpendicular to the principal plane of extension of the heating coil. In this context, a "principal plane of extension" of an object is understood to be, in particular, a plane that is parallel to a largest side face of the 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. "At least substantially ring-shaped" is understood to mean, in particular, that the heating coil, when viewed perpendicular to the principal plane of extension of the heating coil, has a recess, preferably centrally located.In particular, the heating coil and / or the recess, when viewed perpendicular to the main plane of extension of the heating coil, can have a rectangular, oval, and / or preferably a circular shape and / or contour. The term "inside of the heating coil" is understood to mean, in particular, a side of the heating coil which, in a mounted state, faces a, in particular, geometric center point of the heating coil. Furthermore, the term "outside of the heating coil" is understood to mean, in particular, a side of the heating coil which, in a mounted state, faces away from a, in particular, geometric center point of the heating coil. The term "provided for" is understood to mean, in particular, specially designed and / or equipped. The fact that an object is provided 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 state.The term "near area" shall be understood to mean, in particular, a spatial area formed by points that are less than one-third, preferably less than one-quarter, preferably less than one-sixth, and particularly preferably less than one-tenth of the diameter and / or mean diameter of the heating coil from a reference point and / or a reference component, in particular the inside of the heating coil, and / or that each have a distance of at most 10 mm, preferably at most 5 mm, and particularly preferably at most 2 mm from a reference point and / or a reference component, in particular the inside of the heating coil. The term "ferrite element" shall be understood to mean, in particular, a ferrimagnetic element designed to guide and / or adapt, preferably increase, an electromagnetic field, in particular that of the heating coil. The ferrite element is preferably formed in one piece.The material thickness of the ferrite element is between 2 mm and 7 mm, and advantageously between 3 mm and 6 mm. The ferrite element can consist at least partially, preferably at least predominantly, and particularly preferably entirely of any material deemed suitable by a person skilled in the art, especially a ferrimagnetic material, such as a metal oxide, in particular magnetite, and / or the iron oxide hematite. The support unit can further be formed at least partially, preferably at least predominantly, and particularly preferably entirely of 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 "at least a large proportion" shall be understood to mean, in particular, at least 60%, advantageously at least 70%, preferably at least 80%, and most preferably at least 90%. In this context, "high-temperature plastic" shall be understood to mean, in particular, a plastic that has a continuous operating temperature of at least 150°C and preferably at least 200°C. The coil holder advantageously comprises at least one, in particular cylindrical, preferably circular cylindrical, support roller and, in particular, at least one side limiting element. The support roller and the at least one side limiting element, in particular, at least partially and preferably directly, define at least one heating coil receiving area, which is specifically designed to receive, in a mounted state, the heating conductor forming the heating coil and / or at least one heating coil, preferably exactly one heating coil.Preferably, the coil holder is formed in one piece. In this context, "one piece" is understood to mean, in particular, that it is at least materially bonded. This material bond can be achieved, for example, by an adhesive bonding process, an injection molding process, and / or another process that would be considered appropriate by a person skilled in the art. Advantageously, however, "one piece" is understood to mean molded in a single piece. Preferably, this single piece is manufactured from a single blank, particularly preferably by an injection molding process, especially a single-component and / or multi-component injection molding process. The ferrite holder is preferably formed in one piece. Furthermore, the ferrite holder has, in particular, a material thickness that is at least substantially constant.In this context, the term "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 over the object by no more than 10%, preferably no more than 5%, and most preferably no more than 2%. The ferrite holder advantageously has a material thickness between 0.3 mm and 3 mm, preferably between 0.4 mm and 2 mm, and most preferably between 0.5 mm and 1 mm. The mean diameter of the ferrite holder, the ferrite element, and / or the coil holder, particularly when viewed perpendicular to a principal plane of extension of the ferrite holder, the ferrite element, and / or the coil holder, is in particular at least 30 mm, preferably at least 40 mm, and most preferably at least 50 mm, and in particular a maximum of 100 mm, preferably a maximum of 85 mm, and most preferably a maximum of 75 mm.Particularly preferably, the ferrite holder, the ferrite element, and / or the coil holder, viewed especially perpendicular to a principal extension plane of the ferrite holder, the ferrite element, and / or the coil holder, have the same shape, the same contour, and / or the same mean diameter. A "mean diameter" of an object is understood to be, in particular, the diameter of the smallest, especially imaginary, circle that completely encloses the object.

[0009] This design enables the provision of a generic cooktop device with improved efficiency characteristics, particularly in terms of power efficiency, installation space efficiency, and / or assembly efficiency. Specifically, the coupling between the heating coil and the ferrite element can be advantageously improved, thereby improving operating conditions and advantageously reducing the required operating current and / or operating frequency. In particular, electromagnetic stray fields can be advantageously reduced. Furthermore, complexity can be reduced, and costs can be advantageously lowered.

[0010] Preferably, a minimum distance between the heating coil and the ferrite element in the radial direction with respect to a principal plane of extension of the heating coil and / or the ferrite element is at least substantially constant. In this context, the phrase "at least substantially constant" is understood to mean, in particular, that a minimum distance between the heating coil and the ferrite element varies by no more than 10%, preferably no more than 5%, and most preferably no more than 2% over the entire extent of the heating coil and / or the ferrite element. In particular, a minimum distance between the heating coil and the ferrite element in the radial direction with respect to a principal plane of extension of the heating coil and / or the ferrite element is constant, apart from manufacturing tolerances, especially of the heating coil and / or the ferrite element.In particular, a minimal distance between the heating coil and the ferrite element in a central and / or inner area of ​​the heating coil and / or the ferrite element corresponds to a minimal distance between the heating coil and the ferrite element in a peripheral and / or outer area of ​​the heating coil and / or the ferrite element. This can further increase the power efficiency, especially the heating power efficiency, of the cooktop device, particularly since the distance between the heating coil and the ferrite element can be minimized.

[0011] If the ferrite element is flat, apart from manufacturing tolerances, its complexity can be reduced and its production simplified. 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 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, at least a substantially constant material thickness.

[0012] The support unit could, for example, be designed in two parts. In this case, the ferrite holder could be connected to the coil holder, particularly a side limiting element of the coil holder, by means of a friction fit and / or a positive fit, and in particular have at least one fastening element for this purpose, in particular a locking element, screw element and / or bayonet locking element. Preferably, however, the support unit is designed in one piece and is particularly preferably formed from a single piece. In this case, the coil holder and the ferrite holder are designed in one piece. This can, in particular, reduce costs. Furthermore, assembly can be simplified and stability advantageously increased.

[0013] In one embodiment of the invention, it is proposed that the coil holder and the ferrite element form a heating coil receiving area for the heating coil and advantageously, at least partially and preferably to a large extent, directly delimit it. This can, in particular, reduce the complexity of the cooktop device and increase component efficiency. Specifically, it is proposed that the ferrite element indirectly delimits the heating coil receiving area, or that the coil holder and the ferrite element directly delimit the heating coil receiving area in the assembled state, wherein the coil holder has a side limiting element, wherein the support roller and the side limiting element directly delimit the heating coil receiving area, and wherein the heating coil is arranged in the heating coil receiving area in an assembled state.

[0014] In a preferred embodiment of the invention, it is proposed that the heating coil has at least one contact surface with the ferrite element. The phrase "two objects have a contact surface" is understood to mean, in particular, that the at least two objects, especially in an assembled state, touch at least at one point, and thus have at least one point of contact. Preferably, however, the objects have several, in particular at least two, preferably at least three, and most preferably at least four, points of contact. This allows for a further increase in installation space efficiency and / or power efficiency. Furthermore, the number of components can be advantageously reduced.

[0015] Furthermore, it is proposed that the cooktop device comprises at least one locking element, preferably at least two locking elements, which are designed to define a mounting position for the ferrite element and preferably to fix the ferrite element, particularly in the mounting position. In particular, the at least one locking element is arranged on the support unit, in particular the coil holder and / or preferably the ferrite holder, and advantageously attached to it. It is especially preferred that the at least one locking element is formed integrally with the support unit, in particular the coil holder and / or preferably the ferrite holder. The locking element is particularly designed as a stop.Alternatively and / or additionally, the locking element can be designed as a screw, in particular a setscrew, and / or as a projection, in particular a detent projection, and in particular be designed to engage in at least one recess, in particular a detent recess, of the ferrite element, especially in a mounted state. This allows for a particularly advantageously simple, reliable and / or space-saving securing of the ferrite element.

[0016] Preferably, the ferrite holder has a support element, wherein the ferrite holder has a first locking element which is provided to define a mounting position of the ferrite element, wherein the first locking element is arranged on a side of the support element facing the coil holder and wherein the first locking element is connected to the support roller of the coil holder, wherein in particular the support element and the first locking element at least partially define a ferrite receiving area in which the ferrite element is arranged in a mounted state.

[0017] Assembly time can be reduced, in particular, if the ferrite element is attached to the support unit, especially the coil holder and / or the ferrite holder, only by means of a form-fit and / or force-fit, particularly indirectly, and not by a material-fit connection such as with a silicone adhesive and / or adhesive tape. This eliminates the need for at least one, particularly time-consuming, curing step of an adhesive.

[0018] Furthermore, a method for mounting a cooktop device, in particular an induction cooktop device, is proposed according to any one of claims 1 to 9, wherein the coil holder and the ferrite holder form a ferrite element receiving area and the ferrite element is inserted into the ferrite element receiving area in a horizontal direction, in particular with respect to a principal extension plane of the ferrite element. This can advantageously improve efficiency, in particular power efficiency, installation space efficiency and / or assembly efficiency.

[0019] Advantageously, the ferrite element is fixed by means of at least one locking element, which is advantageously designed as a detent projection and is specifically intended to engage in a recess, in particular a detent recess, of the ferrite element. This provides advantageous securing of the ferrite element.

[0020] The cooktop device is not intended to be limited to the application and embodiment described above. In particular, the cooktop device may, to achieve a functionality described herein, have a different number of individual elements, components, and units than specified herein.

[0021] They show: Fig. 1a cooktop designed as an induction cooktop with a cooktop device in a top view, Fig. 2a support unit of the cooktop device in a perspective view, Fig. 3. A ferrite element of the cooktop device in a perspective view, Fig. 4The carrier unit and the ferrite element in an assembled state, with the ferrite holder partially removed for clarity. Fig. 5The carrier unit, the ferrite element and a heating coil in an assembled state, Fig. 6 the support unit in a sectional view along line VI-VI in Fig. 5, Fig. 7 the support unit in a sectional view along line VII-VII in Fig. 5 and Fig. 8a carrier unit of another cooktop device.

[0022] Fig. Figure 1 shows an exemplary induction cooktop 30a in a schematic top view. In this case, the cooktop 30a is designed as a matrix cooktop. The cooktop 30a has a variable cooktop plate with adjustable heating zones. Furthermore, the cooktop 30a includes a cooktop unit. In this case, the cooktop unit has 48 heating units 36a. The heating units 36a are identical to each other. Fig. Figures 2 to 7 describe, by way of example, the construction of one of the heating units 36a of the hob device.

[0023] The cooktop device includes a carrier unit 14a (see Fig. 2) In particular, the heating unit 36a comprises the carrier unit 14a. The carrier unit 14a consists of a liquid crystal polymer. In the present case, the carrier unit 14a is formed in one piece. The carrier unit 14a is thus formed from a single piece.

[0024] The carrier unit 14a comprises a spool holder 16a. The spool holder 16a has a wall thickness between 0.25 mm and 2 mm. Furthermore, the spool holder 16a has a carrier roller 38a (see in particular Fig. 6 and Fig. 7) The support roller 38a has a circular cylindrical shape in a top view. The support roller 38a is designed as a hollow cylinder. Furthermore, the spool holder 16a has a side limiting element 40a. The side limiting element 40a has a honeycomb shape in a top view.

[0025] The side limiting element 40a has a mean diameter of approximately 75 mm in this case. The support roller 38a and the side limiting element 40a at least partially limit a heating coil receiving area 22a. The support roller 38a and the side limiting element 40a directly limit the heating coil receiving area 22a.

[0026] Furthermore, the support unit 14a comprises a ferrite holder 18a. The ferrite holder 18a has a wall thickness between 0.4 mm and 3 mm. The ferrite holder 18a has a support element 42a. The support element 42a has a circular shape in plan view. In this case, the support element 42a has a diameter of approximately 70 mm. Furthermore, the ferrite holder 18a has a first locking element 26a (see in particular Figure 1). Fig. 6) The first locking element 26a is arranged on a side of the support element 42a facing the spool holder 16a. The first locking element 26a is connected to the support roller 38a of the spool holder 16a, in particular integrally. The first locking element 26a is designed as a raised section, particularly relative to the support element 42a. The first locking element 26a has a height of approximately 5.1 mm. In plan view, the first locking element 26a has a shape that is at least substantially rectangular (see in particular the figure). Fig. 4) In this case, the first locking element 26a is hollow. The first locking element 26a is centrally located on the support element 42a. A geometric center point of the first locking element 26a corresponds, in plan view, to a geometric center point of the support element 42a. The first locking element 26a is designed as a stop. The support element 42a and the first locking element 26a at least partially define a ferrite element receiving area 32a. The support element 42a and the first locking element 26a directly define the ferrite element receiving area 32a. In this case, the coil holder 16a, in particular the carrier roller 38a, and the ferrite holder 18a form the ferrite element receiving area 32a. Furthermore, the coil holder 16a, in particular the carrier roller 38a, and the ferrite holder 18a directly define the ferrite element receiving area 32a. In addition, the ferrite holder 18a has a second blocking element 28a.The second locking element 28a is arranged on a side of the support element 42a facing the coil holder 16a. The second locking element 28a is designed as a raised section, particularly relative to the support element 42a. In this case, the second locking element 28a is designed as a detent projection. The second locking element 28a is arranged in an edge region of the support element 42a.

[0027] Furthermore, the cooktop device includes a ferrite element 12a (see Fig. 3) In particular, the heating unit 36a comprises the ferrite element 12a. The ferrite element 12a consists of a high-performance ferrite material. In this case, the ferrite element 12a 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 12a is formed in one piece. The ferrite element 12a is formed at least substantially planar. The ferrite element 12a is flat, apart from manufacturing tolerances. Accordingly, the ferrite element 12a has a material thickness that is at least substantially constant, apart from manufacturing tolerances. In this case, the material thickness of the ferrite element 12a corresponds at least substantially to the height of the first blocking element 26a. The material thickness of the ferrite element 12a is approximately 5 mm in this case. The ferrite element 12a has a honeycomb shape in a top view.The ferrite element 12a has a mean diameter of approximately 75 mm in this case. Furthermore, the ferrite element 12a has a central recess 44a. In plan view, the recess 44a has a circular shape. The diameter of the recess 44a is between 10 mm and 25 mm. In this case, the diameter of the recess 44a is approximately 20 mm. The ferrite element 12a is also slotted. Specifically, the ferrite element 12a has a slot 46a. The slot 46a extends radially from the central recess 44a to a first edge region of the ferrite element 12a. The slot 46a has a width of approximately 12 mm. Finally, the ferrite element 12a has a locking recess 48a. The locking recess 48a is located in a second edge region of the ferrite element 12a. The second edge region is located on a side of the ferrite element 12a opposite the first edge region.Alternatively, it is conceivable that a ferrite element has several locking recesses.

[0028] Fig. Figure 4 shows the carrier unit 14a and the ferrite element 12a in an assembled state, with the ferrite holder 18a partially removed for clarity and ease of description. In a first assembly step, the ferrite element 12a is inserted horizontally 34a with respect to a principal plane of extension of the ferrite element 12a into the ferrite element receiving area 32a. The ferrite holder 18a is designed to hold the ferrite element 12a. Furthermore, the first locking element 26a serves as a guide for the ferrite element 12a. In the assembled state, an outer surface 50a of the first locking element 26a rests against an inner surface 52a of the recess 44a of the ferrite element 12a, in particular in a form-fitting manner. Furthermore, in the assembled state, the second locking element 28a engages in the detent recess 48a of the ferrite element 12a.Accordingly, the first and second locking elements 26a, 28a define a mounting position for the ferrite element 12a. In the assembled state, the ferrite element 12a is thus arranged in the ferrite element receiving area 32a. In this case, the ferrite element 12a is only positively and / or force-fitted to the support unit 14a and, in particular, not materially bonded. Furthermore, in the assembled state, the coil holder 16a and the ferrite element 12a form the heating coil receiving area 22a. In this case, the coil holder 16a and the ferrite element 12a directly define the heating coil receiving area 22a in the assembled state.

[0029] The hob device includes a heating coil 10a (see in particular Fig. 6 and Fig. 7) In particular, the heating unit 36a comprises the heating coil 10a. The heating coil 10a consists of exactly one heating wire. In a second assembly step, the heating wire is wound around the carrier roller 38a, thereby forming the heating coil 10a. The heating coil 10a has 20 windings. In its assembled state, the heating coil 10a is located in the heating coil receiving area 22a. Accordingly, the coil holder 16a and the ferrite element 12a are designed to hold and / or support the heating coil 10a. The heating coil 10a is annular in shape. In a top view, the heating coil 10a has a circular shape. The heating coil 10a has an inner surface 20a. The inner surface 20a corresponds to a side of the heating coil 10a facing the carrier roller 38a. The heating coil 10a has an outer surface 54a. The outer side of the heating coil 54a corresponds to the side of the heating coil 10a facing away from the support roller 38a.Furthermore, the heating coil 10a includes at least two connection contacts (not shown). These connection contacts are intended to supply the heating coil 10a with an electric current. The heating coil 10a is designed to heat cookware through eddy current and / or remagnetization effects.

[0030] In the present case, the heating coil 10a has a contact surface 24a with the ferrite element 12a. Therefore, the heating coil 10a and the ferrite element 12a are in contact. Furthermore, a minimal distance, which in this case is at least substantially negligible, between the heating coil 10a and the ferrite element 12a in the radial direction with respect to a principal plane of extension of the heating coil 10a is constant, apart from manufacturing tolerances of the heating coil 10a and the ferrite element 12a. Thus, a minimum distance between the heating coil 10a and the ferrite element 12a in a central region of the heating coil 10a corresponds, apart from manufacturing tolerances, to a minimum distance between the heating coil 10a and the ferrite element 12a in a peripheral region of the heating coil 10a. Therefore, the minimum distance between the heating coil 10a and the ferrite element 12a is at most 0.8 mm, at least in the immediate vicinity of the inner surface of the heating coil 20a.In the present case, the minimum distance between the ferrite element 12a and the heating coil 10a at any point on the heating coil 10a is at most 0.8 mm.

[0031] In the Fig. Figure 8 shows a further embodiment of the invention. The following description and the drawing are essentially limited to the differences between the embodiments, whereby with regard to identically designated components, in particular with regard to components with the same reference numerals, reference is also generally made to the drawing and / or the description of the other embodiment, in particular the Fig. 1 to 7, reference can be made. To distinguish the embodiments, the letter a is the reference numeral of the embodiment in the Fig. 1 to 7 are appended. In the exemplary embodiment of the Fig. In 8, the letter a is replaced by the letter b.

[0032] The further embodiment of the Fig.8 differs from the previous embodiment at least substantially by a coil holder 16b.

[0033] The coil holder 16b has two side limiting elements 40b and 41b in this case. The first side limiting element 40b corresponds to the side limiting element 40a of the previous embodiment. The second side limiting element 41b is designed as a mica element. In a top view, the second side limiting element 41b has a circular shape. In this case, the second side limiting element 41b has a diameter of approximately 72 mm. The material thickness of the second side limiting element 41b is approximately 0.2 mm. A support roller 38b of the coil holder 16b and the side limiting elements 40b and 41b form a heating coil receiving area 22b. The support roller 38b of the coil holder 16b and the side limiting elements 40b and 41b directly define the heating coil receiving area 22b. Furthermore, a ferrite holder 18b and the second side boundary element 41b form a ferrite element receiving area 32b.The ferrite holder 18b and the second side limiting element 41b directly define the ferrite element receiving area 32b. Accordingly, a ferrite element 12b indirectly defines the heating coil receiving area 22b.

[0034] In a fully assembled state, the minimum distance between a heating coil 10b located in the heating coil receptacle 22b and the ferrite element 12b located in the ferrite element receptacle 32b is between 0.2 mm and 0.3 mm. In this case, the heating coil 10b is free of contact surfaces with the ferrite element 12b. Reference sign 10 Heating coil 12 Ferrite element 14 carrier unit 16 spool holders 18 Ferrite holders 20 Heating coil inside 22 Heating coil mounting area 24 contact area 26 Blocking element 28 Blocking element 30 hob 32 Ferrite element holding area 34 horizontal direction 36 heating units 38 Carrier roller 40 Page boundary element 41 Page boundary element 42 Support element 44 Exclusion 46 slots 48 Rest recess 50 outer surface area 52 inner surface 54 Heating coil outer side

Claims

[1] Hob device comprising at least one heating coil (10a; 10b), at least one ferrite element (12a; 12b) and at least one support unit (14a; 14b) which has at least one coil holder (16a; 16b) which is provided to at least partially hold the heating coil (10a; 10b) and which has at least one ferrite holder (18a; 18b) which is provided to at least partially hold the ferrite element (12a; 12b), wherein a minimum distance between the heating coil (10a; 10b) and the ferrite element (12a; 12b) is at most 0.8 mm at least in the immediate vicinity of an inner surface (20a; 20b) of the heating coil (10a; 10b), characterized by , that the coil holder (16a; 16b) has a support roller (38a; 38b) and that the heating coil (10a; 10b) is formed by a heating line that is wound around the support roller (38a; 38b). [2] Hob device according to claim 1, characterized bythat the ferrite holder (18a; 18b) has a support element (42a; 42b), that the ferrite holder (18a; 18b) has a first locking element (26a; 26b) which is provided for defining a mounting position of the ferrite element (12a; 12b), wherein the first locking element (26a; 26b) is arranged on a side of the support element (42a; 42b) facing the coil holder (16a; 16b), and wherein the first locking element (26a; 26b) is connected to the support roller (38a; 38b) of the coil holder (16a; 16b), wherein in particular the support element (42a; 42b) and the first locking element (26a; 26b) at least partially define a ferrite element receiving area (32a; 32b) in which in a The ferrite element (12a; 12b) is arranged in the assembled state. [3] Hob device according to claim 1 or 2, characterized by, that a minimum distance between the heating coil (10a; 10b) and the ferrite element (12a; 12b) in the radial direction with respect to a principal extension plane of the heating coil (10a; 10b) and / or the ferrite element (12a; 12b) is at least substantially constant. [4] Hob device according to one of the preceding claims, characterized by , that the ferrite element (12a; 12b) is flat apart from manufacturing tolerances. [5] Hob device according to one of the preceding claims, characterized by , that the carrier unit (14a; 14b) is formed in one piece. [6] Hob device according to one of the preceding claims, characterized by , that the coil holder (16a; 16b) and the ferrite element (12a; 12b) form a heating coil receiving area (22a; 22b) for the heating coil (10a; 10b). [7] Hob device according to claim 6, characterized by, that the ferrite element (12b) indirectly limits the heating coil receiving area (22b) or that the coil holder (16a) and the ferrite element (12a) directly limit the heating coil receiving area (22a) in the assembled state, wherein the coil holder (16a; 16b) has a side limiting element (40a; 40b), wherein the support roller (38a; 38b) and the side limiting element (40a; 40b) directly limit the heating coil receiving area (22a; 22b) and wherein the heating coil (10a; 10b) is arranged in the heating coil receiving area (22a; 22b) in an assembled state. [8] Hob device according to one of the preceding claims, characterized by that the heating coil (10a) has at least one contact surface (24a) with the ferrite element (12a). [9] Hob device according to any one of the preceding claims, characterized by , that the ferrite element (12a; 12b) is attached to the support unit 14a only by form-fit and / or force-fit. [10] Hob (30a; 30b) with at least one hob device according to one of the preceding claims. [11] Method for assembling a hob device according to any one of claims 1 to 9, wherein the coil holder (16a; 16b) and the ferrite holder (18a; 18b) form a ferrite element receiving area (32a; 32b) and the ferrite element (12a; 12b) is inserted into the ferrite element receiving area (32a; 32b) in a horizontal direction (34a; 34b). [12] Method according to claim 11, characterized by , that the ferrite element (12a; 12b) is fixed by means of at least one blocking element (26a, 28a; 26b, 28b).

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