Inductive component and method for adjusting an inductance
阅读说明：本技术 电感部件和用于调整电感的方法 (Inductive component and method for adjusting an inductance ) 是由 O·福尔萨 J·弗雷 S·韦伯 于 2020-05-27 设计创作，主要内容包括：本发明涉及一种电感部件(1)包括绕组(2)和用于调整所述电感部件(1)的电感(L)的至少一个调整主体(4、4-1、4-2、4-n),其中所述调整主体(4、4-1、4-2、4-n)包括铁磁性材料并且围绕所述绕组(2)的至少一些区域,其中所述电感(L)经由调整主体(4、4-1、4-2、4-n)的形状和/或位置和/或数量来调整。(The invention relates to an inductive component (1) comprising a winding (2) and at least one adjusting body (4, 4_1, 4_2, 4_ n) for adjusting an inductance (L) of the inductive component (1), wherein the adjusting body (4, 4_1, 4_2, 4_ n) comprises a ferromagnetic material and surrounds at least some regions of the winding (2), wherein the inductance (L) is adjusted via the shape and/or position and/or number of the adjusting body (4, 4_1, 4_2, 4_ n).)
1. An inductance component is provided, which comprises a base,
the inductive component comprises a winding (2) and at least one adjusting body (4, 4_1, 4_2, 4_ n) for adjusting an inductance (L) of the inductive component (1), wherein the adjusting body (4, 4_1, 4_2, 4_ n) comprises a ferromagnetic material and surrounds at least some regions of the winding (2), wherein the inductance (L) is adjusted via the shape and/or position and/or number of the adjusting body (4, 4_1, 4_2, 4_ n).
2. The inductive component of claim 1,
wherein the winding (2) is at least partially arranged within the adjustment body (4, 4_1, 4_2, 4_ n).
3. Inductive component according to any one of the preceding claims, wherein the adjustment body (4, 4_1, 4_2, 4_ n) is configured as a ring or sleeve.
4. Inductive component according to one of the preceding claims, comprising a plurality of adjustment bodies (4_1, 4_2, 4_ n) for adjusting the inductance, wherein the adjustment bodies have different lengths (l1, l2, l3) and/or different diameters (b1, b2, b 3).
5. Inductive component according to any one of the preceding claims, comprising a plurality of adjustment bodies (4_1, 4_2, 4_ n) for adjusting the inductance, wherein a filling body (8_1, 8_2, 8_ n) comprising a non-magnetic material is arranged between at least two of the adjustment bodies (4_1, 4_2, 4_ n).
6. Inductive component according to any one of the preceding claims, wherein the adjustment body (4, 4_1, 4_2, 4_ n) has a centre point (x _4) relative to a winding axis (a) and the winding (2) has a centre point (x _2) relative to the winding axis (a), wherein the centre point (x _4) of the adjustment body (4) is located at a distance (d) from the centre point (x _2) of the winding (2).
7. Inductive component according to one of the preceding claims, comprising a stop (10) for limiting the displacement of the adjustment body along the winding axis (a), wherein the adjustment body (4, 4_1, 4_2, 4_ n) is arranged at a distance from the stop (10).
8. Inductive component according to any one of the preceding claims, wherein the inductance (L) is adjusted via the position of the adjustment body (4, 4_1, 4_2, 4_ n) relative to the winding axis (a).
9. Inductive component according to one of the preceding claims, wherein the adjustment body (4, 4_1, 4_2, 4_ n) is fixed with respect to the winding (2) by means of an applied adhesive (13), wherein the adjustment body (4, 4_1, 4_2, 4_ n) is configured to be displaceable in the direction of the winding axis (a) without the adhesive (13).
10. Inductive component according to one of the preceding claims, comprising a housing (9) for shielding, wherein the adjustment body (4, 4_1, 4_2, 4_ n) is arranged between the housing (9) and the winding (2).
11. The inductive component of any one of the preceding claims, designed as an air core coil.
12. Method for adjusting an inductance value of an inductive component comprising a winding (2) and at least one adjusting body (4, 4_1, 4_2, 4_ n) for adjusting an inductance (L) of the inductive component (1), wherein the adjusting body (4, 4_1, 4_2, 4_ n) comprises a ferromagnetic material and surrounds at least some regions of the winding (2), wherein the inductance (L) is adjusted via the shape and/or position and/or number of adjusting bodies (4, 4_1, 4_2, 4_ n).
13. The method of claim 12, wherein the first and second light sources are selected from the group consisting of,
wherein one or more adjustment bodies (4_1, 4_2, 4_ n) are removed or added for the adjustment.
14. The method according to claim 12 or 13,
wherein the position of the adjustment body (4, 4_1, 4_2, 4_ n) is offset with respect to the winding (2) to adjust the inductance.
15. The method of any one of claims 12 to 14,
wherein the position of the adjustment body (4, 4_1, 4_2, 4_ n) is fixed with respect to the winding (2) after adjusting the inductance.
Technical Field
The present invention relates to an inductive component and a method for adjusting the inductance of an inductive component. This may be a coil with a magnetic core or an air-core coil (i.e. a coil without a magnetic core). Inductive components are used in stereo systems, among other things.
Background
For many applications, it is necessary to make precise adjustments to the inductance values of the components, at least on a statistical average of a set of inductances (batch). Resonant applications in particular require highly accurate adjustment of the inductance.
The exact geometry, material properties and operating temperature affect the inductance of the electrical components. Highly accurate inductance values can only be generated within certain physical limits and require on the one hand a negligible dependence of the material on temperature and on the other hand an accurate control of the geometry and material properties. Correcting for deviations in the inductance value of the finished part from the desired target value is referred to as "tuning" or "tuning".
Documents DE 3618122 a1, DE 3926231 a1, DE 19952192 a1 and DE 102008063312 a1 describe adjustable inductive components. Tuning is typically achieved by pushing or pushing a core of soft magnetic material into or out of the interior of the winding, or by pulling or compressing the winding.
Disclosure of Invention
It is an object of the present invention to provide an improved inductive component and a method for adjusting the inductance of an inductive component.
According to a first aspect of the invention, an inductive component comprises a winding and at least one adjusting body for adjusting the inductance of said inductive component. The adjustment body comprises a ferromagnetic material and surrounds at least some regions of the winding.
In particular, at least some regions of the adjustment body are arranged in a region which is further away from the winding axis of the winding than the outer side of the winding. In particular, the winding is at least partially arranged within the adjustment body. Thus, at least some regions of the adjustment body are arranged in the outer space of the winding. In particular, the adjustment body does not extend into the interior of the winding and is therefore not configured as a magnetic core or as a part of a magnetic core. The windings may also be arranged completely within the adjustment body or only the edge regions of the windings may protrude from the adjustment body.
For example, the length of the adjustment body is similar to the length of the winding. The length of the adjustment body may be shorter or longer than the winding by at most half the length of the winding. Thus, since the longitudinal ends of the adjusting body at the ends of the winding are the main influencing factors, a particularly good setting of the inductance can be achieved by moving the adjusting body out of the central position.
The magnetic field of the winding is guided through the ferromagnetic material of the adjusting body, as a result of which the inductance of the component is adjusted. The material of the conditioning body is preferably non-conductive or only slightly conductive. Thus, no current is induced in the adjustment body to cancel the field generated by the winding. For example, the inductance may be maximized when the adjustment body is centered relative to the coil, and may be reduced when it is displaced.
For example, the adjustment body comprises ferrite or an iron alloy. The material of the conditioning body may be selected such that it is substantially temperature independent. This means that temperature-independent adjustment is possible.
There may be only one adjustment body, or there may be a plurality of such adjustment bodies. The plurality of adjustment bodies will also be referred to as adjustment assemblies hereinafter. The described features for one adjustment body can also be applied analogically to the adjustment assembly or to a single adjustment body of the adjustment assembly.
In one embodiment, the windings are at least partially disposed within the conditioning body. For example, the adjustment body is configured as a hollow body. The adjustment body may particularly be configured as a ring or sleeve.
The inductance of the component is adjusted via adjusting the shape and/or position of the bodies and/or adjusting the number of bodies. In particular, the inductance can be fine-tuned by changing the shape, position and/or number of the adjustment bodies of the components.
The inductive component may comprise a so-called air-core coil. In this case, the component does not have a magnetic core inserted into the winding. In such an implementation, the inductance can be adjusted particularly well via the external adjustment body. In an alternative embodiment, the inductive component may comprise a magnetic core, such as a ferrite core. In this case, the adjustment body is preferably arranged separately from the ferrite core.
For example, the winding wire is configured as a flat wire. It may be a copper wire. For example, the inductance of the component is between 1nH and 1000 nH. Depending on the design, the inductance can be adjusted by changing the adjustment body in a range of up to 10%.
In one embodiment, the component comprises a plurality of such adjustment bodies. For example, the adjustment body forms an adjustment assembly in the shape of a sleeve, in which the winding is arranged. The inductance can be flexibly adjusted by combining adjustment bodies having different lengths, shapes, and material compositions, and by changing the number of adjustment bodies.
The adjustment body may have different lengths. The length is defined as the extension along the winding axis of the winding. An adjustment body may be added or removed to adjust the inductance. The adjustment body may be fixed in its position if the inductance value of the component corresponds to the target value.
Alternatively or additionally, the adjustment body may have a different diameter. The diameter is defined as the extension of the adjustment body perpendicular to the winding axis. To perform the adjustment, one adjustment body may be replaced by an adjustment body having a different diameter. Adjustment bodies with different geometries can also be combined. For example, adjustment bodies having circular, elliptical, and rectangular outer profiles may be combined.
Alternatively or additionally, the adjustment body may comprise a different ferromagnetic material. To perform the adjustment, one adjustment body may be replaced by an adjustment body comprising a different material.
The number of adjustment bodies can also be varied in order to adjust the inductance. The filling body comprising non-magnetic material may also be replaced by an adjustment body and vice versa. A filler body comprising a non-magnetic material may also be arranged between at least two of the adjustment bodies. For example, the filling body comprises a plastic material.
In various embodiments, the adjustment body has a center point relative to the winding axis, wherein the center point is located at a distance from the center point of the winding relative to the winding axis. The winding axis may also be defined as the x-axis. Thus, the center point of the adjustment body is located at a distance from the center point of the winding in the x-direction.
By way of example, the center point is the geometric center point of the winding or tuning body relative to the winding axis. The center point may also refer to the center of mass or the magnetic center of the winding or tuning body.
For example, adjusting the displacement of the body away from the center point of the winding results in a decrease in inductance, and displacement towards the center point results in an increase in inductance. The initial arrangement at a distance from the centre point, i.e. the eccentric arrangement, provides sufficient flexibility for adjusting the inductance. In particular, there may also be a spacing arrangement after the trimming.
The adjustment body or winding may be moved directly to offset the center point. Changing the shape, material or number of the adjustment body may also offset the center point.
In one embodiment, the inductance is adjusted via adjusting the position of the body relative to the winding axis. To perform the adjustment, the adjustment body can be moved in both directions relative to the winding, for example until a target value is reached. Correspondingly, it is also possible to move a single adjustment body of the adjustment assembly or the entire adjustment assembly.
The inductive component may comprise a stop for limiting the displacement of the adjustment body along the winding axis. For example, the stop is formed by a portion of, or attached to, the coil carrier. Stops for limiting the displacement may also be provided on both sides.
For example, the adjustment body is arranged at a distance from the stop before and/or after the displacement. Thus, there is room for moving the adjustment body towards the stop, so that there is flexibility in trimming the inductance. The adjustment body may also abut the stop prior to fine adjustment and move away from the stop during fine adjustment.
For example, before and/or after trimming, the adjustment body is arranged such that a displacement in one direction will result in an increase in inductance and a displacement in the opposite direction will result in a decrease in inductance. For example, the center point of the adjustment body is located at a distance from both the center point of the winding and from the stop position. The stopper position is a position of a center point of the adjustment body when the adjustment body abuts the stopper.
For example, the distance of the center point of the body from the stop position is adjusted to be at least 20% of the distance between the stop position and the center point of the winding. Additionally or alternatively, for example, adjusting the distance of the center point of the body from the stop position is at least 20% of the distance between the stop position and the center point of the winding.
For example, the adjustment body or the adjustment assembly is fixed relative to the winding. After the inductance is adjusted, the adjusting body is in particular fixed against displacement along the winding axis. To this end, for example, the adhesive is applied before or after the adjustment. If the adhesive is applied prior to adjustment, a slow curing adhesive may be used so that the adjustment body may be moved to make the adjustment prior to the adhesive curing.
The binder may be an adhesive. For example, the adhesive attaches the adjustment body to the winding or coil carrier. Therefore, after the adjustment body has been fixed, no further adjustment can be performed. However, the components may be configured such that adjustment by moving the adjustment body along the winding axis before applying the adhesive is possible.
In one embodiment, the inductive component comprises a housing for shielding. This may be a metal housing. The adjustment body may be disposed between the housing and the winding. Additionally or alternatively, the adjustment body may also act as a shield.
According to another aspect of the present invention, a method for adjusting an inductance value of an inductive component is provided. According to the method, an inductive component is provided that includes a winding and a conditioning body. The adjustment body comprises a ferromagnetic material and surrounds at least some regions of the winding. In the method, the shape and/or position and/or number of adjustment bodies is changed in order to adjust the inductance.
For example, the inductive component described above is provided and adjusted during the method. Alternatively or additionally, the method may be used to obtain the inductive component described above.
For example, there may be multiple adjustment bodies as described above. For example, the inductance may be adjusted by removing, adding, or replacing the adjustment body. The adjustment body may have different lengths, diameters and/or materials.
For example, the inductance is measured before the inductance is adjusted. If there is a deviation from the target value, the adjustment is performed using the adjustment subject. After the adjustment, another measurement may be performed (if necessary), and another adjustment may also be performed.
In one embodiment, the inductance is adjusted by offsetting the position of the adjustment body along the winding axis. In particular, the relative position of the winding and the adjustment body is important here, so that the displacement comprises a direct displacement of the winding while the adjustment body remains in place.
For example, the adjustment body is arranged before adjustment such that the inductance can be increased by displacement in one direction and the inductance can be decreased by displacement in the opposite direction. In particular, the inductance value may be highest when the adjustment body is centered with respect to the winding, and may be lowest when the arrangement is most eccentric.
For example, the adjustment body is initially positioned at the stop location and then moved toward the center point of the winding for adjustment. The adjustment body may also be moved beyond the center point. For example, after the adjusting, the distance of the center point of the body from the stop position of the center point is adjusted to be at least 20% of the distance between the stop position and the center point of the winding.
Additionally or alternatively, for example, adjusting the distance of the center point of the body from the stop position is at least 20% of the distance between the stop position and the center point of the winding. These minimum distances may also exist prior to adjustment so that there is sufficient room for displacement in either direction, and therefore sufficient room to reduce or increase inductance.
After the adjustment, the position of the adjustment body relative to the winding may be fixed. For example, binders (in particular adhesives) are used for this purpose.
The present disclosure describes several aspects of the present invention. All features disclosed with respect to a component or method are disclosed correspondingly with respect to another aspect, even if the respective feature is not explicitly mentioned in the context of the other aspect.
The description of the subject matter provided herein is not limited to the particular embodiments. Rather, the features of the individual embodiments can be combined with one another within technical justification.
The objects described herein will be explained in more detail below with reference to schematic design examples.
Drawings
These figures show that:
figure 1 is an embodiment of an inductive component in side view,
figure 2 is another embodiment of an inductive component in side view,
figure 3 is another embodiment of an inductive component in side view,
figure 4 is another embodiment of an inductive component in side view,
fig. 5A to 5C are methods for adjusting inductance in the schematic diagrams.
In the following figures, the same reference numerals preferably refer to functionally or structurally equivalent parts of the various embodiments.
Detailed Description
Fig. 1 shows an inductive component 1 comprising a winding 2. The winding 2 is formed by a helically wound wire 3.
For example (see fig. 4), the wire 3 is wound around the coil carrier 11. The component 1 may be configured as a so-called air-core coil, wherein no magnetic core is present in the interior of the winding 2. Thus, the coil carrier 11 is non-magnetic. The coil carrier 11 comprises or is made of plastic, for example. Alternatively, the coil carrier 11 is configured as a magnetic core, or a magnetic core is inserted into the coil carrier 11.
The inductive component 1 comprises an adjustment assembly 40, which is formed by a plurality of adjustment bodies 4_1, 4_2, 4_ n. After the winding 2 has been completed, the inductance can be adjusted accurately by means of the adjusting assembly 40. The adjustment bodies 4_1, 4_2, 4_ n surround at least some areas of the winding 2. In particular, the adjustment bodies 4_1, 4_2, 4_ n are arranged at least partially in a region which is further away from the winding axis than outside the winding 2.
In particular, at least in some areas, the winding 2 is arranged between at least one of the adjustment bodies 4_1, 4_2, 4_ n and the winding axis a. "disposed in between" is defined by a perpendicular line connecting one point of the adjustment bodies 4_1, 4_2, 4_ n to the winding axis a striking the winding 2.
The respective adjusting bodies 4_1, 4_2, 4_ n are formed by a ring or sleeve made of ferromagnetic material. For example, the material is ferrite.
In the present case, the adjustment bodies 4_1, 4_2, 4_ n form a hollow cylinder in which the winding 2 is arranged. The coil carrier may also be arranged in the hollow cylinder. The lead ends 6 and 7 protrude from the adjustment bodies 4_1, 4_2, and 4_ n. The wire ends 6, 7 continue, for example, to connect the component 1 to contact terminals (not shown), or are provided with another contact connection (not shown).
After the inductance is adjusted, the adjusting body 4_1, 4_2, 4_ n may be fixed with respect to the winding 2. For example, the adjustment bodies 4_1, 4_2, 4_ n are attached to the winding 2 or coil carrier with an adhesive (e.g., an adhesive). This may be a fast or slow curing adhesive depending on the adjustment procedure. For example, it is a UV adhesive.
In addition to the adjusting bodies 4_1, 4_2, 4_ n, the component 1 may use a housing (not shown here) which at least partially surrounds the adjusting bodies 4_1, 4_2, 4_ n and the winding 2. The housing may increase the adjustment range.
The housing may be a metal housing, for example. This may be a separate component, for example in the form of a metal cylinder. It may also be a wrap of metal foil, in particular aluminum foil, which is wrapped around the adjustment body 4_1, 4_2, 4_ n. Alternatively, it may also be a coating on the adjustment body 4_1, 4_2, 4_ n. The housing preferably extends over the entire winding 2, in particular when the adjustment assembly 40 does not extend over the entire winding 2.
In the present case, the length of the adjustment assembly 40 is similar to the length of the winding 2; in particular, the adjustment assembly 40 is slightly longer than the winding 2.
There may also be gaps 5 between the adjustment bodies 4_1, 4_2, 4_ n. In particular, the gap 5 may be such that the position of the adjustment body 4_1, 4_2, 4_ n may be changed parallel to the winding axis to adjust the inductance.
To adjust the inductance, individual adjustment bodies 4_1, 4_2, 4_ n (in this case rings) can be selectively added or removed. For example, after the winding 2 has been generated, the adjusting bodies 4_1, 4_2, 4_ n are arranged around the winding 2 and subsequently the inductance of the component 1 is measured. Depending on the deviation from the target value, one or more of the adjustment bodies 4_1, 4_2, 4_ n are removed or other adjustment bodies 4_1, 4_2, 4_ n are added. The inductance may then be measured again and a check performed to see if the target value has been reached. The other adjustment bodies 4_1, 4_2, 4_ n are switched if necessary.
The adjustment body 4 may have different lengths l _1, l _2, l _ n. Depending on the magnitude of the deviation between the target value and the measured value, longer or shorter adjustment bodies l _1, l _2, l _ n are removed or added.
For example, before the adjustment, the inductance component 1 includes adjustment bodies 4_1 to 4 — n. For adjustment, the adjustment body 4_1 is removed, so that the inductive component 1 only comprises the adjustment bodies 4_2 to 4_ n. The adjustment assembly 40 comprising the remaining adjustment bodies 4_2 to 4 — n is now shorter and results in a change of the inductance, in particular a reduction of the inductance of the component 1. In particular, a change at the edge of the winding 2 results in a change in inductance.
The center of gravity of the adjustment assembly 40 is now also no longer positioned centrally with respect to the winding 2 in the axial direction, but is offset to the right with respect to the winding 2. This results in a change in inductance, in particular a reduction in inductance of the component 1.
Alternatively or additionally, the adjustment bodies 4_1, 4_2, 4_ n may also have different peripheral shapes. For example, the adjustment bodies 4_1, 4_2, 4_ n may have a rectangular peripheral shape or an elliptical peripheral shape. Then, tuning can be performed by changing the replacement of the adjustment body with an adjustment body having a different size.
The wires 3 of the winding 2 are configured as flat wires, for example. It may be a copper wire.
For example, the inductance of component 1 is between 1nH and 1000 nH. Depending on the design, the inductance can be adjusted in steps of, for example, 0.01% of the total inductance in a range of up to 10% by changing the adjustment assembly 40. If the subdivision of the adjustment assembly 40 is very fine, the inductance value can be tuned much more accurately to well below 1nH in steps of 1 nH.
The inductance can be flexibly adjusted by adjusting different lengths, shapes, numbers and material compositions of the bodies 4_1, 4_2, 4_ n in combination. Due to the large number of possible combinations, optimal configurations in terms of AC losses, inductance, size, emission characteristics, radiation characteristics, shielding, thermal development, robustness, etc. can be found so that optimal performance can be achieved.
Fig. 2 shows a further embodiment of an inductive component 1. Compared to fig. 1, in addition to the adjustment bodies 4_1, 4_2, 4_ n, filling bodies 8_1, 8_2, 8_ n are included herein. The filler bodies 8_1, 8_2, 8_ n are non-magnetic. For example, the filling bodies 8_1, 8_2, 8_ n comprise a plastic material.
The filling bodies 8_1, 8_2, 8_ n fill the spaces between the adjustment bodies 4_1, 4_2, 4_ n and are used to determine the position of the adjustment bodies 4_1, 4_2, 4_ n or to fill the empty space, for example after removal of the adjustment bodies to adjust the inductance. The respective filling bodies 8_1, 8_2, 8_ n may have the same length as the adjustment bodies 4_1, 4_2, 4_ n. The filler bodies 8_1, 8_2, 8_ n may also have different lengths than the adjustment bodies 4_1, 4_2, 4_ n.
For example, to adjust the inductance, one of the adjustment bodies 4_1, 4_2, 4_ n is replaced with the filling body 8_1, 8_2, 8_ n, or the positions of the filling body 8_1, 8_2, 8_ n and the adjustment body 4_1, 4_2, 4_ n are changed.
Fig. 3 shows a further embodiment of the inductive component 1. Compared to fig. 2, the adjustment bodies 4_1, 4_2, 4_ n have different diameters b1, b2, bn. For example, to make an adjustment, one adjustment body is replaced by an adjustment body having a larger or smaller outer diameter.
Here, one or more filling bodies 8_1 may also be arranged between the adjustment bodies 4_1, 4_2, 4_ n. In the present case, there is only one filling body 8_1 between two of the adjustment bodies 4_1, 4_2, and no filling body between the other adjustment bodies 4_2, 4_ n. There may also be filler bodies between all or none of the conditioning bodies.
Here is also indicated a housing 9 accommodating the adjustment assembly 4 and the winding 2. The adjustment assembly 4 is arranged between the housing 9 and the winding 2. The adjustment assembly 4 may abut a wall of the housing 9. The adjustment bodies 4_1, 4_2, 4_ n may also be attached to the housing 9. The housing 9 may also be included in the other embodiments shown. Such a housing 9, in particular a metal housing, can improve the shielding and increase the adjustment range.
Alternatively or in addition, the adjustment bodies 4_1, 4_2, 4_ n can also assume a shielding function, so that the inductance is decoupled from the environment. Shielding of such electromagnetic waves/fields is necessary in particular in the high frequency range. The decoupling may be further optimized with another metal housing.
In alternative embodiments of the air-core coil, the coil carrier may also be configured as a magnetic core (e.g., a ferrite core), or a magnetic core may be present in the coil carrier.
Fig. 4 shows a further embodiment of an inductive component 1. Here, the adjustment assembly 40 is also arranged in the outer space of the winding 2, which in this case comprises only a single adjustment body 4. The adjustment body 4 is configured as a sleeve. The winding 2 is arranged in the adjustment body 4. In the present case, the lead ends 6, 7 protrude from the same end of the adjustment body 4. The wire ends 6, 7 may also protrude from different ends.
In the present case, the adjustment body 4 is longer than the winding 2. For example, the adjustment body 4 is at most half the length of the winding 2 longer than the winding 2.
The inductance is here adjusted by moving the adjusting body 4 along the winding axis a. Thus changing the (longitudinal) position of the adjustment body 4 relative to the winding 2. In particular, the distance d from the central point x _4 of the adjustment body 4 to the center x _2 of the winding 2 is varied. By way of example, the center points x _2, x _4 refer to the geometric center points of the winding 2 or the adjustment body 4 with respect to the winding axis a, which may also be referred to as the x-axis. The center points x _2, x _4 may also refer to the center of mass or the magnetic center of the winding 2 or the adjustment body 4.
The inductive component 1 comprises a stop 10 which limits the displacement of the adjustment body 4 along the winding axis a. The stop 10 is, for example, an integral part of a coil carrier 11 around which the winding 2 is arranged. The stop 10 limits the maximum displacement of the adjustment body 4 in one direction. When the adjustment body 4 abuts the stopper 10, the position of the center point of the adjustment body 4 is identified as x _ 10.
For example, in the initial position, the center point x _4 of the adjustment body 4 is arranged midway between the stop position x _10 and the center point x _2 of the winding 2. In this case, there is sufficient fine adjustment space in both longitudinal directions. For example, a displacement away from the center point x _2 of the winding 2 results in a decrease in inductance, and a displacement away from the stop position x _10 towards the center point x _2 of the winding 2 results in an increase in inductance.
In particular, changing the position of the adjustment body 4 on the longitudinal edges of the winding 2 has a significant effect. It is therefore advantageous to move at least one longitudinal end of the adjusting body 4 in the region of a longitudinal end of the winding 2. For example, the distance between the longitudinal ends of the winding 2 and the adjusting body 4 is at most only a few millimeters before or after the inductance is adjusted. In particular, the distance between the longitudinal ends of the adjustment body 4 and the respective closest longitudinal ends of the windings 2 is different.
After the inductance has been set, the setting body 4 is fixed in position relative to the winding 2, for example on the coil carrier 11 or directly on the winding 2. In the end position, the adjustment body 4 is for example not centrally positioned, i.e. its centre point x _4 is located at the position of the centre point x _2 of the winding 2, nor at the stop position x _10, but between these two positions, or even outside the centre point x _2 as seen from the stop position x _ 10. For example, the longitudinal ends of the adjustment body 4 have different distances to the nearest edge-side turn of the winding 4.
The coil carrier 10 may further comprise one or more spacers 12 for positioning the adjustment body 4, in particular centered at a fixed distance from the winding axis a. By way of example, the spacer 12 is configured as a radial projection of the coil carrier 10 against which the inner wall of the main body 4 is adjusted. Other components may also be mounted as spacers on the coil carrier.
In the present case, the coil carrier 10 has a cylindrical shape. The coil former may also have different shapes, such as a cube-like shape. The coil carrier 10 may also be part of a larger body, for example a ring-shaped body. The coil carrier 10 may be configured as a hollow body.
Combinations of the characteristics of the embodiments of fig. 1 to 3 and the embodiment of fig. 4 are also possible. In particular, the coil carrier 11 can also be included in the embodiment of fig. 1 to 3, and the wire ends 6, 7 protrude from the same end. In fig. 1 to 3, the centre point of the adjustment assembly 40 on the winding axis a can also be used as a measure for the position of the adjustment assembly 40 relative to the winding 2, and additionally or alternatively displacements of the adjustment assembly 40 or the adjustment body 4_1, 4_2, 4_ n relative to the winding 2 are possible.
Fig. 5A to 5C show method steps for adjusting the inductance of the inductive component 1.
According to fig. 5A an inductive component 1, such as the component according to fig. 4, is provided. For example, the adjustment body 4 is arranged with its center point at a position x _4 midway between the stop position x _10 and the position x _2 of the center point of the winding 2.
For example, the initial position of the adjustment body 4 may also be the stop position x _10, and the adjustment body 4 is moved from the stop position x _10 towards the center point x _2 of the winding 2. The adjustment body 4 can also be moved beyond the center point x _2 if necessary. This has the advantage that the initial position of the adjustment body 4 can be easily adjusted.
The inductance L of the component 1 is measured. The desired displacement of the tuning body 4 along the winding axis a (x-axis) is determined as a function of the target value of the inductance L of the component 1.
According to fig. 5B, the adjustment body 4 is then moved according to the deviation of the measured value from the target value.
For example, if the measured value is greater than the target value of the inductance L, the adjustment body 4 is moved away from the center point x _2 of the winding 2 towards the stop position x _ 10. If the measured value is smaller than the target value of the inductance L, the adjustment body 4 is moved towards the centre point x _2 of the winding 2. The displacement may be performed in defined steps (e.g. in the μm range). For example, the maximum displacement is in the millimeter range. The displacement is performed, for example, with the aid of a stepper motor. The length of the displacement may also be set as a function of the deviation from the target value.
For example, depending on the geometry of the component 1, the inductance can be reduced by up to 5% by moving the adjustment body 4 from the position of the central point x _2 to the stop position x _ 10. If the adjustment body 4 is in a central position with respect to the winding 2, a maximum inductance value can be achieved; if there is a maximum displacement to position x _10, then a minimum inductance value can be achieved.
The inductance value can then be measured again. If the inductance is close enough to the target value, the position x _4 of the adjustment body 4 is fixed.
According to fig. 5C, the adjustment body 4 is fixed in its x-position. For example, the adjustment body 4 is attached to the winding 2 or the coil carrier 11 by means of an adhesive 13. The adhesive 13 may be an adhesive, in particular a UV adhesive, for example. The adhesive 13 is applied and cured.
The end position x _4 is now available for a set of components 1. Alternatively, each individual component 1 can also be adjusted again. The method is suitable for adjustment in full-automatic production.
For the embodiments of fig. 1 to 3, a corresponding adjustment method can be carried out. In these embodiments, after measuring the inductance L in fig. 5A, one of the adjustment bodies 4_1, 4_2, 4_ n may be removed or added for adjustment, for example.
List of reference numerals
1 inductive component
2 winding
3 conducting wire
40 adjustment assembly
4. 4_1, 4_2, 4_ n adjustment body
5 gap
6 end of wire
7 end of wire
8_1, 8_2, 8_ n fill the body
9 casing
10 stop
11 coil carrier
12 spacer
13 Binder
Axis of winding A
Center of x _2 winding
x _4 center of adjustment body/adjustment assembly
x _10 stop position
d winding distance center-adjusting body center
L-shaped inductor
b1、b2、bnDiameter of
l1、l2、lnLength of