DE1514452B2 - PROCESS FOR PRODUCING A TAP OF A COIL WITH HOMOGENOUS LAYER WINDING, LOCATED WITHIN A WINDING POSITION - Google Patents

Description

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The invention relates to a method for producing a tap located within a winding layer a coil with homogeneous layer winding when winding the coil on a winding body, wherein a Wire loop is guided out of the winding in such a way that the wires forming the wire loop run parallel to the coil axis and approximately perpendicular to the turns of the winding.

It is known that for the construction of electrical circuits, coils are very often required, either as Reaction elements or for the transformation of voltages and flow or also for the coupling of Resonance circuits can be built into the circuit. Well-known examples of this are transformers or Transmitters of all kinds. In particular, coils are used to build up lossless or almost lossless electrical Filters are essential components. For winding these coils there are already a number of Procedure known. In particular, so-called automatic winding machines always prove themselves when one larger number of coils are to be manufactured in series. The coil windings can be on so-called Coil bobbins are applied, which expediently consist of a low-loss dielectric material. So-called self-supporting coils are also known, in which the individual turns initially be applied to a coil core. One uses, for example, to produce such coils a copper enamel wire, which is additionally coated with an adhesive that can be softened by heat is. After the winding process, such coils are then heated up to a temperature which softens the adhesive warmed up. As a result, the individual turns are glued together and after cooling, i. H. so After the adhesive has hardened, the core can be removed without the coil losing its shape. As is well known, the so-called fill factor must be taken into account in the manufacture of coils, the whole considerably determines the spatial dimensions of the coils and partly also in the electrical ones Properties such as inductance, self-capacitance and loss factor are included. Below the fill factor is known to be the ratio of the total volume of the coil to that actually with bare wire understood the filled volume. To achieve the smallest possible spatial dimensions and to use coils to obtain only a small manufacturing spread and easily reproducible electrical properties is one therefore strives to achieve the theoretically maximum possible fill factor 1 as far as possible. This is what it is before all things necessary, during the winding process of the bobbin, a so-called "wild" winding avoid d. H. in other words, to guide the wire in such a way that the individual turns are exactly next to one another in every position lie, and that the individual winding layers are also arranged exactly one above the other, so that on each In the case of crossing wires or a jumping of the wire from one winding layer to any one other winding positions can be avoided. Such evenly wound coils are to be used in the following as Coils with homogeneous layer winding are referred to. There are also already known methods that the Allow production of coils with homogeneous layer winding.

For example, today's filter technology often requires the production of so-called tapped coils, in which the tap is within a layer in order to thereby obtain coils, their inductance value and whose transmission ratio adapts as precisely as possible to the given mathematical requirements. In itself it is not a particular problem to tap a coil with a homogeneous layer winding} to be provided at the end of any position. However, if the tap is installed within a tier must, then the homogeneity of the winding is disturbed by this tapping and a coil is created at which, at least from the first tap, again shows a "wild" winding, so that the advantages of the homogeneous layer winding are largely lost.

In this context, a coil with tapping is known from US Pat. No. 21 54 070, at of the wires that are used to lead out and form a wire loop at the transition point from the Winding for tapping are angled twice by an angle significantly different from 90 °, so that there is a kind of triangular surface und.die individual wires with adhesive film or the like in their position can be fixed. However, this type of winding ensures the homogeneity of the following Locations disturbed.

The invention is based on the problem of solving the above-mentioned difficulties Coils in a relatively easy way to counter and a method of making a tapped Specify coil with homogeneous layer winding, at

which maintains the homogeneity of the winding even if the tap is within a layer is to be brought in.

Based on a method for producing a tap located within a winding layer a coil with homogeneous layer winding when winding the coil on a winding body, wherein a Wire loop is guided out of the winding in such a way that the wires forming the wire loop run parallel to the coil axis and approximately perpendicular to the turns of the winding, it will The object according to the invention is achieved in that, when the winding process is interrupted, a shuttle which the Has the shape of a U-shaped channel, through a radial slot in the flange of the The winding body is introduced into the winding space and advanced to the tap that the wire loop is pulled out through the channel of the shuttle, and that when winding the shuttle remains in the winding space at least until the wire loop passes through at least one turn of the Winding wire is fixed.

Advantageous refinements are given in the subclaims.

The invention is explained in more detail below with the aid of exemplary embodiments.

The method according to the invention is shown schematically in FIG. 1. A bobbin 1 firmly attached to a rotatable axle 2 is driven, for example, by a motor M indicated by an arrow, which is mechanically fixed in connection with the axle 2. The wire 3 coming from a wire supply roll runs over a guide roll 4 which is freely movable with respect to an axis 5. The axis 5 is fastened, for example, in a metallic block 6, which is movable in the direction of the double arrow 7 in a specially provided mounting, not shown in detail in the drawing. The roller 4 is designed so that the wire 3 experiences a certain amount of friction, so that the wire is wound onto the bobbin with a predetermined pretension. This bias can also be adjusted via a spring 8 which is attached on the one hand to the block 6 adjustable in the direction of the double arrow 7 and on the other hand to a stationary part 9 of the overall arrangement. Details about the management of the block 6 and about the setting of the spring tension are not shown, since they do not contribute to an understanding of the invention per se. As already mentioned, the wire guide roller 4 is freely movable in the axial direction of the axis 5 and is carried along evenly in the direction of the double arrow 10 by the winding of the wire. It is assumed that a few layers of turns have already been applied to the bobbin 1 in such a way that a homogeneous layer winding is created. The last layer of this winding is denoted by the reference number 12. As already mentioned, a homogeneous layer winding is to be understood as a winding in which, on the one hand, the turns of each layer are exactly next to one another, and in which, on the other hand, the individual layers are arranged exactly one above the other in such a way that the wires of successive layers are each about half Wire diameters are offset from one another. In this way, the winding wires are each in the grooves formed by the underlying layer. From the layer 13 following layer 12, a tap is to be led out at any point in the layer. For this purpose, the wire 3 coming from the wire supply roll is formed into a wire loop 15 at the transition point from the winding to the lead out and this wire loop is guided out of the spool in such a way that the wires 16 and 16 'forming the loop are at least approximately perpendicular to those on the spool already wound wires of layer 13 are available. It should be noted here that the radius of curvature at the transition points 17 and 17 'from the winding to the lead out is selected to be less than or at most equal to the wire diameter, since otherwise the homogeneity of the further winding would be disturbed. In addition, it is useful to ensure that the two wires 16 and 16 'are relatively closely adjacent to one another within the flanges 19 of the bobbin. The wire loop 15 can be cut open after the final completion of the coil and freed from the insulating varnish, so that a tap that can be switched as required is available.

Fig. 1 also shows a simple method with whose help the aforementioned conditions can be met in a relatively simple manner. To the Fixation and for guiding the wire loop 15 which is perpendicular to the wire that has already been wound a U-shaped curved shuttle 20 is used, which by a in the flange 19 of the bobbin in radial Direction running slot is introduced into the interior of the coil to be wound. This boat is presented to the tap of the layer 13 and the wire loop 15 in the groove of the shuttle from the Winding pulled out. With this device, winding is now carried out normally. The one on the reel The winding wire 3 that comes up already fixes the one that is led out vertically in the first turn after tapping Wire loop 15. The shuttle can then be pulled out of the bobbin, However, this results in another interruption of the winding process.

In order to avoid this repeated interruption of the winding process, the shuttle 20 is expedient designed as it is shown in perspective in FIG. For this purpose, the shuttle 20 is on the The side facing the winding is provided with a bevel or rounded portion 21. In this case then runs as the coil continues to be wound, the wire 3 over the bevel 21 and pushes due to the through the Spring 8 pretensioned the boat with every further turn by the amount of the wire diameter out of the bobbin, whereby the shuttle automatically from the interior of the Coil is removed as soon as the tap provided with the layer is wound to the end. To lead out the wire loop can advantageously use a needle 23 which is facing the winding on its The end 24 is bent in a hook shape and the pulling out of the wire loop from the interior the coil is made much easier. To avoid damage to the insulating varnish applied to the wire avoid, at least the edges of the shuttle 20 are expediently broken or rounded, the come into direct contact with the wire.

For the sake of simplicity, that of FIG. 1 is shown in FIG Wire supply roll incoming wire 3 between the guide roll 4 and the actual winding vertically drawn to the coil axis. In fact, however, it is the case that the wire running up on the winding has a slight inclination with respect to the coil axis,

since the guide roller 4 has to be pulled through the wire in the direction of the double arrow 10. Depending on whether a layer running from left to right or from right to left is wound, the wire running onto the winding forms an angle with the coil axis facing the motor M which is slightly smaller or slightly larger than 90 °. For the winding process itself, this tendency is important as it causes the wire to be held at the point of the tap and the layers above and, in conjunction with the wire tension, to be properly inserted into the grooves formed by the layer below.

Of course, even with this type of winding, it cannot be avoided that the lead out tapping a layer of the total winding space - if, for example, the whole coil is only one Tap owns - gets lost. On the other hand, however, it is achieved that the homogeneity of the winding remains flawlessly even after the tap, so that the individual turns even after the tap lie exactly next to each other. The tap is only noticeable in the way that in the above Tapping lying layers creates an increase that is in the order of magnitude of the wire diameter. When several taps are brought out, the individual taps are expedient in the circumferential direction offset against each other to avoid unnecessary loss of space.

Another possibility for producing a tap is shown in FIG. The Wire loop 15 brought out of the spool in such a way that the wires 16 and 16 'on the with the Tap to be provided winding layer 13 rest. The winding is done in the same way as with Embodiment of FIG. H. it is expedient to use the shuttle 20 shown in FIG Fixing the tap used. The shuttle is only then on the interior of the coil removed when the tap provided with the layer 13 is fully wound and the winding wire in the subsequent situation comes back to the tap.

The F i g. FIG. 4 shows in cross section a coil consisting of three layers which, according to the method shown in FIG. 1 shown Procedure is wrapped. The cut is made so that it runs through the coil axis, and that a wire of the wire loop formed by the lead-out is visible. For a better overview, the wire diameter is not to scale, but shown greatly enlarged. As shown in FIG. 4 can be seen, lie in every layer has the same number of turns. The distance between the spool flanges is chosen so that the individual Layers of wires lying on top of one another are offset from one another by half the wire diameter, so that, for example, the wires lying in position II in those formed by the wires in position I. Grooves lie. The coil is wound in such a way that the first turn coming from the beginning of the coil 29 is formed by the wire visible in cross-section 30 and 30 ', namely the wire runs with a Reference numbers provided with apostrophes in the plane of the drawing, while with the reference numbers Cross-sectional planes marked without apostrophes emerge from the drawing plane. According to this definition, the wire is at the end of the layer I from the cross section 36 'to the position II Cross section 37 out. The tap 16 (of the wire loop 15 is only the Wire 16 visible) and then the layer II is wound to the end, which is indicated by the cross-sections 41 to 42 ' is indicated. With the cross-section 43 begins the position III, which is led to the cross-section 48 'and there with the lead-out 50 ends.

From Figure 4 it can be clearly seen that in the area of the lead out an increase in the individual Layers occurs, which corresponds approximately to the wire diameter. Despite this increase, the wire will ' out almost the entire circumference in the grooves of the underlying layer, so that the homogeneity the winding is retained. In particular, with a suitable wire bias, which depends on Wire diameter can be optimally selected by the inclination that the wire between the wire roll 4 and of the winding opposite the coil axis ensures that also at the transition point from the cross section 45 'to cross-section 46' the wire is held in the position shown.

The F i g. 5 shows in cross section a coil which, according to the method shown in FIG. 4 drawn procedure is wound. The coil itself is wound up to the tap in the same way as the one shown in Figure 4, however, in cross section 40 'the tap is brought out in such a way that the wire loop (from the in Sectional view of FIG. 5 only the wire 16 is visible) is placed on the layer II to be tapped. After leading out the tapping, the layer II ending in cross-section 42 'is finished wrapped first and then all further winding positions in the already described | Way applied.

For the efficient production of the coils, it has been found to be expedient to use the method shown in FIG. 2 drawn To subdivide the shuttle 20 in the longitudinal direction, or to produce it from two profile pieces with a rectangular profile and to connect these two sections together in such a way that they look like scissors against each other can be moved.

1 sheet of drawings

Claims (4)

Patent claims: 1. A method for producing a tap on a coil located within a winding layer homogeneous layer winding when winding the coil on a winding body, with a wire loop is guided out of the winding in such a way that the wires forming the wire loop are parallel to the Coil axis and run approximately perpendicular to the turns of the winding, thereby characterized in that when the winding process is interrupted, a shuttle (20) which the shape has a U-shaped channel through a radial slot in the flange of the The winding body (19) is introduced into the winding space and pushed forward to the tapping point (17, 17 '), that the wire loop (15) is pulled out through the groove of the shuttle (20), and that when Continue to wind the shuttle (20) at least as long as it remains in the winding room until the wire loop is fixed by at least one turn of the winding wire. 2. The method according to claim 1, characterized in that the wire loop (15) with the aid of a hook-shaped needle (23, 24) which can be inserted into the groove of the shuttle (20) is pulled out. 3. Arrangement for performing the method according to one of the preceding claims, characterized characterized in that the U-shaped shuttle (20) on the one facing the winding Side is provided with a bevel or a rounding (21). 4. Arrangement according to claim 3, characterized in that the U-shaped boat (20) is divided in the longitudinal direction and designed in the manner of a pair of scissors.