WO2011128799A1

WO2011128799A1 - Method for producing an inductor for an induction cooktop and inductor for an induction cooktop

Info

Publication number: WO2011128799A1
Application number: PCT/IB2011/051380
Authority: WO
Inventors: Manuel Almolda Fandos; Sandra Aranda Vazquez; Ignacio Garde Aranda; Oscar Gracia Campos; Pablo Jesus Hernandez Blasco; Alfonso Lorente Perez; Maria Elena Moya Albertin
Original assignee: BSH Bosch und Siemens Hausgeräte GmbH
Priority date: 2010-04-15
Filing date: 2011-03-31
Publication date: 2011-10-20
Also published as: ES2388393B1; ES2388393A1

Abstract

The invention relates to a method for producing an inductor (2) for an induction cooktop, wherein a plate-like support (1) is provided, on which at least one magnetic back iron (15, 15a, 15b) is formed on one side (3) and a coil (12) is formed on the opposite side (11). An adhesive is introduced in continuous recesses (10a to 10j) in the support (1), and in a gluing step the magnetic back iron (15, 15a, 15b) and the coil (12) are glued to the support (1). The invention also relates to an inductor (2).

Description

Method for producing an inductor for a

Induction hob and inductor for an induction hob

The invention relates to a method for producing an inductor for an induction hob, in which a plate-like support is provided, on which on one side at least one magnetic return element and on the opposite side of a coil are formed. Furthermore, the invention relates to an inductor for an induction hob.

Induction hobs comprise an inductor which is arranged under a hob plate, which may be formed of glass ceramic, for example. In electromagnetic interaction with the material of the plate set up on the hob cooking vessel introduced in the preparation vessel food is heated and prepared.

The production of such inductors is currently very expensive, since a plurality of components must be positioned relative to each other and must also be attached to the plate-like support. Both the magnetic return elements and the wire for the coil are thereby attached in conventional methods in several steps to the carrier. For this it is necessary to glue the components to the carrier in several successive adhesive steps and moreover also with different adhesives. This is very expensive and expensive.

From EP 1 560 462 A2 an inductor with a coil carrier is known. The coil carrier comprises at least one receiving space for at least one magnetic return means, wherein this return means is held in the receiving space such that the receiving spaces are closed by a common cover. The plurality of return means are arranged as narrow strips in the radial direction of the coil carrier and thus in the vertical direction with respect to the winding of the induction coil, which is helically wound in a plane parallel to the magnetic return means. It is an object of the present invention to provide a method for producing an inductor for an induction hob as well as such an inductor, which can be formed less expensive with regard to the attachment of the components to the carrier.

This object is achieved by a method comprising the features of claim 1 and an inductor having the features of claim 6.

In a method according to the invention for producing an inductor for an induction hob, first of all a plate-like carrier is provided. At least one magnetic return means or magnetic return element is attached to a first side of this plate-like carrier. On the opposite side of the plate-like support, an inductor coil is attached. This is generated in particular in several windings of a coil wire. In continuous recesses in the plate-like carrier, an adhesive is introduced, and in an adhesive step, the magnetic return element and the coil is adhered to the carrier. By this method, only one bonding step is performed and thereby the two essential components, namely the at least one magnetic return element and the coil, can be adhered to the support. As a result, a considerable amount of time and thus a cost reduction is connected.

Moreover, this approach and the very specific application of the adhesive at specific positions of the carrier, it is therefore no longer necessary to perform several adhesive steps for attachment of the return means and the coil. In addition, no longer several different adhesive materials, such as a paste-like adhesive on the one hand and an adhesive film on the other hand, as required in the prior art required.

It is preferably provided that when the magnetic return element is pressed against the carrier, the adhesive introduced into the recesses of the plate-like carrier is pressed partially through the recesses onto the other side of the carrier and pressed over the coil already mounted there. In particular, a side facing away from the carrier of the coil is also arranged electrically insulating insulator plate bonded to the carrier and / or the coil by means of the overflowed adhesive. It is therefore advantageously secured not only by this one single bonding step, the magnetic return element and the coil to the carrier, but it can hereby also another essential component of the inductor, namely the insulator plate, in this one bonding step and with this an adhesive the carrier and / or the coil are glued. The manufacturing process of the inductor can be made even more efficient.

Preferably, such an electrically insulating insulator plate is made of a so-called and known mica material.

Preferably, the recesses are formed as slots or elongated slots in the plate-like support and extend from the center outwards to the edge of the plate-like support, in particular in an inclined configuration towards the edge. As a result, on the one hand a very simple introduction of the adhesive can be made in these recesses and on the other hand a best possible distribution of the adhesive on both sides of the plate-like support are ensured, whereby a particularly effective and efficient attachment of different components on both sides of the plate-like support by only a single gluing step is possible.

Preferably, the coil is applied to the carrier by winding a coil wire and held with a holding device prior to the introduction of adhesive into the recesses of the carrier. At the same time, this electrically holding insulating plate is also held in position with this holding device. It is therefore carried out before the introduction of the adhesive already a corresponding positioning of the coil on the carrier in a first intermediate step and beyond a positionally accurate arrangement of the insulator plate to the coil, which is held in position during the manufacturing process by the holding device. As a result, on the one hand, an undesired positional shift of the coil and the insulator plate can be avoided. In addition, unwanted leakage or overflow when introducing the adhesive into the recess from the side from which the magnetic return elements are then applied to the carrier is avoided. The coil then serves to introduce the adhesive into the Recesses already as a mechanical stop element. Such a sequence of steps is most suitably fast and precise with regard to the introduction of the adhesive and the retention of the adhesive at the desired location until complete bonding of all components to the support.

Thus, in particular in a single adhesive step with a single adhesive, in particular a silicone adhesive, the magnetic return element, the coil and an insulator plate are glued to the carrier.

After the adhesive has been introduced into the recesses, the at least one magnetic return element is introduced into the intended positions and receptacles in the plate-like support on the side of the plate-like support intended for this purpose and pressed against the support. As a result, the adhesive introduced beforehand in the recesses is then pushed past the recesses and, in particular, laterally past the coil. In that the recesses are sized and arranged to extend outwardly from the center towards the edge of the plate-like support when the coil is mounted over the outer edge of the coil, an exposed portion remains with the recesses when the coil is mounted which is not covered by the coil. This is particularly advantageous, since it is then on these exposed recesses a fast and targeted Vorbeidrücken the adhesive on the coil is made possible, so that this adhesive can then be formed in sufficient quantities and at desired positions next to and on the coil and thereby the insulator plate adhered to the desired locations on the spool and / or on the carrier. Alone through the sequence of steps in the attachment of the magnetic return elements to the support thus automatically the removal of the adhesive in the recesses at the desired locations on the opposite side, on which the coil and the insulator plate are achieved and there is an automatic bonding ensures these components with the carrier.

Furthermore, the invention relates to an inductor for an induction hob, which has a plate-like carrier, on one side of which at least one magnetic return element and on the opposite side of a coil are arranged. The plate-like carrier has one or more continuous recesses, in which an adhesive is applied, with which both the magnetic return element and the coil are adhered to the carrier in a single bonding step.

The inductor preferably comprises an electrically insulating insulator plate, which is arranged on the side facing away from the carrier of the coil. The insulator plate is glued to the adhesive introduced in the recesses by means of the single gluing step on the support.

Preferably, the adhesive provided for bonding the insulator plate to the carrier extends laterally past the regions of the recesses which are not covered by the coil, past the coil. The inductor is manufactured with a view to securing the magnetic return element, coil and insulator plate with a single adhesive in a single bonding step.

Preferably, the plate-like support is made as a one-piece component, in particular made of plastic. This makes it relatively quick and inexpensive to manufacture and is also very easily trained. In addition, an electromagnetic neutral design is possible by this material, so that the electromagnetic interaction between the coil and the magnetic yoke elements is not affected thereby.

Preferably, the at least one return element is designed as a ferrite component having at least partially, wherein it is formed in particular as a plate of a ferrite material. In particular, the return element comprises a plurality of return partial elements. These are oriented in the direction of current flow in the induction coil, whereby the electromagnetic interaction is improved. Preferably, the inductor comprises six return partial elements, which are arranged symmetrically to at least one horizontal axis of symmetry of the inductor. Preferably, the magnetic return element is formed of a plurality of segments or return partial elements, which are arranged substantially to a closed induction coil shape successively in the winding direction of the induction coil and in particular give a total shape corresponding to the induction coil shape in the winding state. Preferably, the winding shape and thus the induction coil shape is corner-free, in particular oval, formed. Owing to an oval shape, new cooking zone geometries can be formed particularly advantageously, in which case particularly for new preparation vessels, a particularly adapted zone heating in the region of a cooking zone is made possible so that as little energy loss as possible occurs. Particularly preferably, the induction coil shape is a flat ring with a particular oval ring shape, in which case the shape of the at least one magnetic return element is a flat ring. A flat ring is understood to mean a shape in which the radial thickness of the ring is not just one line but has a greater width in this regard.

Advantageous embodiments of the method according to the invention are to be regarded as advantageous embodiments of the inductor according to the invention.

An embodiment of the invention will be explained in more detail with reference to schematic drawings. Show it:

Fig. 1 is a plan view of a first side of the carrier of an inductor to which magnetic return elements are attached;

Figure 2 is a plan view of the carrier on a second side, on which the coil is already applied.

FIG. 3 shows a plan view of the carrier on the side according to FIG. 1 with already introduced magnetic return-circuit elements; FIG. and

Fig. 4 is a plan view of the illustrations of FIG. 2 with in addition to the

Coil applied electrically insulating insulator plate.

In the figures, identical or functionally identical elements are provided with the same reference numerals. In Fig. 1, a plate-like carrier 1 of an inductor 2 for an induction hob is shown in a plan view. The plate-like carrier 1 is a one-piece plastic part, which has an oval shape. In the illustration according to FIG. 1, it is shown with a first side 3 which has a plurality of receivers 4, 5, 6, 7, 8 and 9. In these shots 4 to 9 magnetic return partial elements, which are formed in particular of ferrite and plate-like shapes, introduced. They are used for electromagnetic interaction with a mounted on the opposite side of the carrier 1 coil. Continuous recesses 10a, 10b, 10c, 10d, 10e, 10f, 10g, 10h, 10i and 10j are furthermore formed in the plate-like carrier 1. As can be seen, they extend from the center in an oblique orientation outwards to the edge of the plate-like carrier 1. For producing the inductor 2, first of all this plate-like carrier 1 is provided as shown in FIG.

In a further method step, as shown in FIG. 2, a coil 12 is then formed on the second side 11 opposite the first side 3. For this purpose, a coil wire is wound in a variety of turns in an oval shape.

As can be seen in the illustration according to FIG. 2, the winding of the coil 12 takes place in such a way that subareas of the recesses in the direction towards the edge of the plate-like carrier 1 extend beyond an edge 13 of the coil 12. There are thus areas 101 a, 101 b, 101 c, 101 d, 101 f, 101 g, 101 i and 101 j given, which are not covered by the coil 12.

In a holding device, not shown, by means of which the coil 12 and the coil wire on the side 1 1 of the plate-like support 1 is wound, in addition, an electrically insulating insulator plate 14 shown in Fig. 4, which is formed of a mica material beyond is held. In the illustration according to FIG. 4, a top view of this insulator plate 14 is shown. It is arranged on the side facing away from the Trägerl of the coil 12 on the spool 12 and covers it completely as shown in FIG. 4. In the assembled state of the inductor 2 under a cooktop plate of the induction cooktop, this insulator plate between the underside of the cooktop plate and the coil 12 is arranged. Subsequent to the process step in which the intermediate configuration of the inductor 2 and the insulator plate 14 shown in FIG. 2 are held on the holding device, a silicone adhesive is then introduced into the recesses 10a to 10j in a subsequent method step. This is done from that side 3 of the carrier 1, as shown in the plan view of FIG. 1 and FIG. 3. Thus, the adhesive is introduced from that side 3 into the recesses 10a to 10j, on which the magnetic return-circuit sub-elements are subsequently introduced. The already applied on the opposite side 1 1 coil 12 then serves as a kind of stopper for the introduced into the recesses 10 a to 10 j from the side 3 ago adhesive.

After this adhesive has been introduced into the recesses 10a to 10j, then, as shown in Fig. 3, the magnetic return element 15 is introduced. In the exemplary embodiment, this magnetic return circuit elements 15 is formed of a plurality, in particular six magnetic return partial elements, of which in Fig. 3, only two return partial elements 15a and 15b, which are incorporated in the receptacles 4 and 5 are shown.

The further four return partial elements are not shown in FIG. 3 and are then introduced into the receptacles 6 to 9 in the carrier 1.

In view of this, these return partial elements 15a and 15b are introduced simultaneously or successively into the receptacles 4 and 5 provided for this purpose and pressed against the carrier 1. As a result, the silicon adhesive introduced into the recesses 10a to 10d is pressed through these recesses 10a to 10d and, in particular, passes over the uncovered partial regions 101a to 101d past the coil 12 and thus passes over the coil 12 so as to form the insulator plate 14 reached.

Thus, in a single bonding step with a single adhesive, adhering both the magnetic return part elements, of which only the two elements 15a and 15b are shown in FIG. 3, the coil 12 and the insulator plate 14 to the support 1 is performed. Carrier list

inductor

page

, 5, 6, 7, 8, 9 recording

0a, 10b, 10c, 10d, 10e, 10f, 10g, 10h

0i, 10j recesses

1 page

2 coil

3 edge

4 insulator plate

5, 15a, 15b return element

01 a to 101 j portions of the recesses

Claims

claims

Method for producing an inductor (2) for an induction hob, in which a plate-like support (1) is provided, on which on one side (3) at least one magnetic return element (15, 15a, 15b) and on the opposite side (11 ) a coil (12) are formed, characterized in that in continuous recesses (10a to 10j) in the carrier (1) an adhesive is introduced and in an adhesive step, the magnetic return element (15, 15a, 15b) and the coil (12 ) are adhered to the carrier (1).

A method according to claim 1, characterized in that when the magnetic return element (15, 15a, 15b) is pressed against the carrier (1), the adhesive introduced into the recesses (10a to 10j) is partially penetrated by the

Recesses (10a to 10j) on the other side (1 1) of the carrier (1) over the coil (12) is pressed and on the carrier (1) facing away from the coil (12) arranged electrically insulating insulator plate (14) is glued to the carrier (1) and / or the coil (12) by means of the overflowed adhesive.

A method according to claim 2, characterized in that the recesses (10a to 10j) extend laterally outward than the coil (12), so that at least over the uncovered by the coil (12) region (101 a to 101 f) of the recesses (10a to 10j) the adhesive is pressed over the coil (12), in particular onto the side of the coil (12) facing the insulator plate (14), and is glued to the insulator plate (14).

Method according to one of the preceding claims, characterized in that prior to the introduction of adhesive into the recesses (10a to 10j) of the carrier (1) the coil (12) by winding a coil wire on the support (1) is applied and with a holding device , in which also an electrically insulating insulator plate (14) is kept accurate position, is held. Method according to one of the preceding claims, characterized in that in a single adhesive step with a single adhesive, in particular a silicone adhesive, the magnetic return element (15, 15a, 15b), the coil (12) and an insulator plate (14) on the support ( 1) are glued.

Inductor for an induction hob, with a plate-like support (1), on whose one side (3) at least one magnetic return element (15, 15a, 15b) and on the opposite side (1 1) a coil (12) are arranged, characterized in that in continuous recesses (10a to 10j) in the carrier (1) an adhesive is introduced, with which both the magnetic

Return element (15, 15a, 15b) and the coil (12) are glued in a single gluing step on the carrier (1).

An inductor according to claim 6, characterized in that an electrically insulating insulator plate (14) on the carrier (1) facing away from the coil (12) is arranged, and the insulator plate (14) with the in the recesses (10a to 10j) introduced Adhesive is glued to the carrier (1) by means of the single gluing step.

Inductor according to Claim 7, characterized in that the adhesive provided for bonding the insulator plate (14) to the carrier (1) extends laterally through the regions (101a to 101f) of the recesses (10a to 10f) not covered by the coil (12) 10j) extends past the coil (12).