inductive component

Abstract

The invention relates to an inductive component having a core and at least one winding on the core, wherein the core defines an air gap in a magnetic circuit, wherein the winding wire of the winding has a non-circular cross section having a larger lateral dimension and a smaller lateral dimension relative to the larger lateral dimension, in particular a rectangular, parallelogram or trapezoidal cross section, wherein the winding wire in a first winding section surrounds a first core section and / or the air gap, and in the first winding section the larger lateral dimension of the winding wire is arranged oblique to or parallel to a central longitudinal axis of the first core section and / or the air gap.

Description

Technical Field

[0001] The present invention relates to an inductor having a core and at least one winding on the core, wherein the core defines an air gap in a magnetic circuit, and wherein the winding wire of the winding has a non-circular cross-section having a large lateral dimension and a smaller lateral dimension relative to the large lateral dimension, particularly having a rectangular, parallelogram or trapezoidal cross-section. Summary of the Invention

[0002] The purpose of this invention is to improve an inductor component.

[0003] Therefore, according to the present invention, an inductor having the features of claim 1 is provided. Advantageous improvements of the invention are mentioned in the dependent claims.

[0004] An inductor component has a core and at least one winding on the core, wherein the core defines an air gap in a magnetic circuit. The winding wire of the winding has a non-circular cross-section with a larger lateral dimension and a smaller lateral dimension relative to the larger lateral dimension. In particular, the winding wire has a rectangular, parallelogram, or trapezoidal cross-section. The winding wire surrounds a first core segment and / or the air gap in a first winding section, and in the first winding section, the larger lateral dimension of the winding wire is arranged obliquely to or parallel to the central longitudinal axis of the first core segment and / or the air gap.

[0005] For inductors with a core, the magnetic field lines also extend through the air gap. In the air gap region, the magnetic field lines occupy a larger space than inside the core. In other words, compared to their orientation within the core, the magnetic field lines deform and typically bulge in the air gap region. If the magnetic field lines pass through the winding at least partially in the air gap region, it results in losses because this heats the winding wires. This effect is particularly pronounced under rapid current fluctuations (i.e., so-called "ripple current"). Heating the winding wires reduces the efficiency of the inductor. The advantages gained through rectangular winding wires are thus partially lost. On the other hand, if the winding terminates before the air gap, the space around the air gap cannot be utilized.

[0006] By arranging the winding wires around the first core segment and / or the air gap in the first winding section, and by arranging the larger lateral dimension of the winding wires in the first winding section at an angle to or parallel to the central longitudinal axis of the first core segment and / or the air gap, the winding wires can be arranged such that the magnetic field lines in the air gap region do not pass through the winding wires or only pass through the winding wires at a significantly smaller scale. This can significantly reduce the losses of the inductor components. Therefore, arranging the larger lateral dimension of the winding wires at an angle to or parallel to the central longitudinal axis of the first core segment and / or the air gap allows for at least partial utilization of the space surrounding the air gap to accommodate the winding wires, while preventing or largely preventing the magnetic field lines in the air gap region from passing through the winding wires and thereby heating the winding wires.

[0007] In an improved embodiment of the invention, the second winding section surrounds the second core section, wherein, in the second winding section, the larger lateral dimension of the winding wire cross-section is arranged perpendicular to the central longitudinal axis of the second core section, and wherein, in the air gap region, the larger lateral dimension of the winding wire is arranged inclined to or parallel to the central longitudinal axis of the air gap.

[0008] Therefore, the angle between the larger lateral dimension of the winding wire cross-section and the central longitudinal axis of the core changes in the air gap region. For example, the larger lateral dimension of the winding wire is first arranged at an angle at the beginning of the air gap, then arranged approximately parallel to the central longitudinal axis of the air gap in the middle region, and finally arranged at an angle to the central longitudinal axis of the air gap again in the end region.

[0009] In the improved embodiment of the present invention, the orientation of the larger lateral dimension of the winding wire cross-section relative to the longitudinal axis of the air gap center changes.

[0010] In this way, a gradual transition can be achieved. For example, in terms of the length of the winding, the orientation can transition from a larger lateral dimension perpendicular to the longitudinal axis of the air gap center to an orientation parallel to the longitudinal axis of the air gap center, and then back to an orientation perpendicular to the longitudinal axis of the air gap center.

[0011] In an improved embodiment of the present invention, in the air gap region, the orientation of the larger lateral dimension of the winding wire cross-section changes from a first inclined orientation relative to the longitudinal axis of the air gap center to a parallel orientation, and then to a second inclined orientation.

[0012] In the improved embodiment of the present invention, the first inclined orientation relative to the longitudinal axis of the air gap center has a first angle, and the second inclined orientation relative to the longitudinal axis of the air gap center has a second angle, wherein the first angle and the second angle have equal values ​​but different signs. Attached Figure Description

[0013] Other features and advantages of the invention are given by the claims and the following description of preferred embodiments of the invention in conjunction with the accompanying drawings. Here, individual features of the different illustrated and / or described embodiments can be arbitrarily combined with each other without departing from the scope of the invention. This also applies to the combination of a single feature with other single features associated with it in the illustrations and / or description. The drawings show: Figure 1 A front view of an inductor component according to a first embodiment of the present invention. Figure 2 : Figure 1 A cross-sectional view of the inductor component. Figure 3 : Figure 1 A side view of the winding of the inductor component. Figure 4 : Figure 3A cross-sectional view of the winding. Figure 5 A front view of an inductor component according to a second embodiment of the present invention. Figure 6 : Figure 5 A cross-sectional view of the inductor component. Figure 7 : Figure 5 A top-angle view of the windings of the inductor component. Figure 8 : Figure 5 A side view of the winding of the inductor component. Figure 9 A frontal view of an inductor component according to a third embodiment of the present invention. Figure 10 : Figure 9 A cross-sectional view of the inductor component, and Figure 11 : Figure 9 A cross-sectional view of the winding of an inductor component. Detailed Implementation

[0014] Figure 1 An inductor component 10 is shown, which has a winding 12 and a core 14. The core consists of two parts, a first E-shaped portion 16 and an identical second E-shaped portion 18. The winding 12 is made of winding wire with a rectangular cross-section. Therefore, the rectangular cross-section has a larger lateral dimension (corresponding to the width of the winding wire) and a smaller lateral dimension (corresponding to the height of the winding wire). The winding has a first winding section 20, a second winding section 22, and a third winding section 24. Figure 1 The first and second core sections are not shown; they are constructed in a cylindrical shape and extend from the base of core portions 16 and 18 into winding 12, respectively. This corresponds to the known structure of the so-called E-shaped core. The free ends of the first and second core sections are arranged at intervals, such that the magnetic circuit formed by core 14 has an air gap.

[0015] exist Figure 1As can be seen, in the first winding section 22, the larger lateral dimension of the winding wire is arranged perpendicular to the imaginary central longitudinal axis 26 of the air gap. The central longitudinal axis 26 of the air gap coincides with the central longitudinal axes of the first and second core sections. Conversely, in the first winding section 20 surrounding the air gap, the orientation of the larger lateral dimension of the winding wire relative to the central longitudinal axis 26 changes. It can be seen that the larger lateral dimension is initially arranged with increasing inclination until it reaches an orientation parallel to the central longitudinal axis 26 at half the length of the air gap. Then, the orientation of the larger lateral dimension changes from a parallel orientation through an inclination orientation to a perpendicular orientation in the third winding section 24. Therefore, in the first winding section 20, the orientation of the larger lateral dimension of the winding wire cross-section gradually changes from a first inclination orientation relative to the central longitudinal axis 26 of the air gap to a parallel orientation, and then gradually changes from a parallel orientation to a second inclination orientation. Here, at any position in the first winding section before half the length of the air gap, a first tilt orientation with respect to the longitudinal axis of the air gap center has a first angle, and a second tilt orientation with respect to the longitudinal axis of the air gap center 26 and symmetrical about half the length of the air gap has a second angle, wherein the first angle and the second angle are equal in value but different in sign.

[0016] Figure 2 It shows Figure 1 A cross-sectional view of the inductor component 10. The core 14 and its two portions 16 and 18 can be seen, each having an E-shaped cross-section. An air gap 34 is formed between the first core segment 30 of the first portion 16 and the second core segment 32 of the second portion 18. Figure 2 The cross-sectional view shows how the angle of the larger lateral dimension of the winding wire cross-section changes from the vertical orientation in the second winding segment 22 to the vertical orientation in the first winding segment 20. This change in angle towards the vertical orientation in the third winding segment 24 is not shown in... Figure 2 It is shown in the figure, but done in a similar manner.

[0017] Crucially, in the region of air gap 34, the radial distance of the winding wire from the air gap is greater between the two core segments 30 and 32 than in the region of the first core segment 30 and the region of the second core segment 32. The magnetic field lines 36 bulge in the region of air gap 34; therefore, due to the radial bulge of the field lines 36, the space occupied by the magnetic field in the region of air gap 34 is greater than in the regions of the first core segment 30 and the second core segment 32. Now, by arranging the larger lateral dimension of the winding wire in the region of air gap 34 first at an angle, then parallel, and then at an angle to the central longitudinal axis 26 of the air gap, it is possible to prevent the magnetic field lines 36 in the region of air gap 34 from passing through the winding wire. This prevents or largely avoids heating of the winding wire and significantly reduces the losses of the inductor component 10.

[0018] To illustrate this clearly, magnetic field lines 36 are drawn in the region of the air gap 34, which are intended to qualitatively show the typical orientation of the magnetic field lines 36 in the air gap region.

[0019] Figure 3 Shown in side view Figure 1 The winding wire 12 of the inductor component is shown, but the core 14 is not shown. It can be seen that the vertical orientation of the winding wire relative to the central longitudinal axis gradually transitions from the vertical orientation in the second winding section 22, to the orientation of first tilting, then parallel, and then tilting again in the first winding section 20, until it becomes vertical again in the third winding section 24.

[0020] Figure 4 It shows Figure 3 A cross-sectional view of winding 12. It can be seen that the winding wire has a rectangular cross-section, and the larger lateral dimension 40 of the winding wire (corresponding to the width of the winding wire) is about eight times larger than the smaller lateral dimension 42 (corresponding to the height of the winding wire).

[0021] Figure 5 A front view of an inductor 50 according to another embodiment of the present invention is shown. The structure of the inductor 50 is similar to... Figure 1 The inductor component 50 is very similar to the inductor component 10, so only the differences between it and the inductor component 10 will be described. In particular, the core 14 of the inductor component 50 has the same structure as the core 14 of the inductor component 10, and has a first portion 16 and a second portion 18, each of which is constructed in an E-shape. Like the winding 12 of the inductor component 10, the winding 52 of the inductor component 50 is made of winding wire with a rectangular cross-section. In the second winding section 22, which surrounds the first core section 30, the larger lateral dimension of the winding wire cross-section is oriented perpendicular to the central longitudinal axis 26 of the air gap 34, and in the third winding section 24, the larger lateral dimension of the winding wire is also oriented perpendicular to the central longitudinal axis 26. Conversely, in the region of the air gap 34 and therefore in the first winding section 20, the larger lateral dimension of the winding wire is oriented parallel to the central longitudinal axis 26. Here, the winding wire extends substantially parallel to the central longitudinal axis 26 over the entire length of the air gap 34. Therefore, in the region of air gap 34 and thus in the first winding section 20, not only is the orientation of the larger lateral dimension of the winding line changed, but the winding line also changes its direction, no longer extending circumferentially relative to the central longitudinal axis 26 as in the second winding section 22 and the third winding section 24, but extending parallel to the central longitudinal axis 26.

[0022] Figure 6 It shows Figure 5 A cross-sectional view of the inductor component 50. It can be seen that in the region of the air gap 34, the magnetic field lines will resemble... Figure 2As shown in the diagram, the winding lines are radially spaced very far from the air gap 34. Therefore, there is no need to worry about the magnetic field lines in the air gap 34 region crossing the winding lines and causing losses.

[0023] Figure 7 It shows Figure 5 A view of the winding 52 of the inductor component 50, the core is not shown. Figure 8 It shows Figure 7 Side view of winding 52.

[0024] Figure 9 An inductor component 60 according to another embodiment of the present invention is shown. The inductor component 60 has a winding 62 and a core 64. The core 64 is composed of two parts, having an E-shaped first part 66 and a substrate-shaped second part 68.

[0025] Winding 62 is made of winding wire with a rectangular cross-section. Core 64 defines a portion having... Figure 9 Magnetic circuit with an invisible air gap.

[0026] Figure 10 It shows Figure 9 A cross-sectional view of the inductor component 60. Here, Figure 9 The cross-section extends from the lower left to the upper right, thus also passing through the opening in the first portion 66 of the core 64. It can be seen that the core 64 has a first core segment 68 constructed as a cylinder on the first portion 66, its free end spaced apart from the second portion 68. Thus, an air gap 70 is defined between the free end of the first core segment 68 and the upper side of the second portion 68. The orientation of some exemplary magnetic field lines 72 is shown in the air gap 70. It can be seen that the field lines 72 originating from the free end of the first core segment 68 bend radially away from the central longitudinal axis 26. As the distance from the free end of the first core segment 68 increases, the diameter of the space occupied by the magnetic field lines 72 also increases.

[0027] To prevent the magnetic field lines 72 from passing through the windings of the winding 62, the windings of the winding 62, which have a rectangular cross-section, are arranged at an angle relative to the central longitudinal axis 26 of the air gap 70. The angle occupied by the larger lateral dimension of the windings of the winding 62 is deflected downward from the vertical position. In the illustrated embodiment, the angle between the central longitudinal axis 26 and the corresponding upper or lower side of the winding is approximately 120°.

[0028] By slanting the winding wires, the larger lateral dimension of the winding wires can be increased compared to an arrangement where the larger lateral dimension is perpendicular to the central longitudinal axis 26, while maintaining the same core size. In other words, wider winding wires can be used. Winding wires with a parallelogram cross-section can also be used. If desired, this method can optimally utilize the mounting space inside the core 60.

[0029] The inclined orientation of the winding wires through the winding 62, which has a larger lateral dimension, prevents the magnetic field lines 72 in the air gap 70 from passing through the winding wires, thus significantly reducing the losses of the inductor 60.

[0030] Figure 11 It shows Figure 9 and Figure 10 A cross-sectional view of the winding 62 of the inductor component. It can be clearly seen that the larger lateral dimension 40 of the cross-section of the winding wire of the winding 62 is arranged obliquely relative to the central longitudinal axis 26. Since the winding wire has a rectangular cross-section, the smaller lateral dimension 42 is also arranged obliquely relative to the central longitudinal axis 26.

Claims

1. An inductor component having a core and at least one winding on the core, wherein, The core defines an air gap in the magnetic circuit, wherein the winding wire of the winding has a non-circular cross-section with a large lateral dimension and a smaller lateral dimension relative to the large lateral dimension, particularly having a rectangular, parallelogram, or trapezoidal cross-section, characterized in that the winding wire surrounds a first core segment and / or the air gap in a first winding segment, and in the first winding segment, the larger lateral dimension of the winding wire is arranged obliquely to or parallel to the central longitudinal axis of the first core segment and / or the air gap.

2. The inductor component according to claim 1, characterized in that, The second winding section surrounds the second core section, and in the second winding section, the larger lateral dimension of the cross-section of the winding wire is arranged perpendicular to the central longitudinal axis of the second core section, and in the air gap region, the larger lateral dimension of the winding wire is arranged inclined to or parallel to the central longitudinal axis of the air gap.

3. The inductor component according to claim 1 or 2, characterized in that, In the region of the air gap, the orientation of the larger lateral dimension of the cross-section of the winding wire changes relative to the central longitudinal axis of the air gap.

4. The inductor component according to claim 3, characterized in that, In the region of the air gap, the orientation of the larger lateral dimension of the cross-section of the winding wire changes from a first inclined orientation relative to the central longitudinal axis of the air gap to a parallel orientation, and then to a second inclined orientation.

5. The inductor component according to claim 4, characterized in that, The first tilt orientation relative to the central longitudinal axis of the air gap has a first angle, and the second tilt orientation relative to the central longitudinal axis of the air gap has a second angle, wherein the first angle and the second angle are equal in value but have different signs.

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