Method for forming a winding piece for an inductive component and inductive component
The method of forming a planar cut piece with specific sections and deforming it around a bending die addresses the challenges of achieving good electrical and mechanical properties in winding pieces for inductive components, enabling efficient and automatic formation of integral winding strips.
Patent Information
- Application Number
- JP2024570701
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2022-05-30
- Filing Date
- 2023-05-26
- Publication Date
- 2025-06-17
AI Technical Summary
Existing methods for forming winding pieces for inductive components face challenges in achieving good electrical properties and mechanical integrity, especially when high current intensity is involved.
A method involving the formation of a planar, integral, and electrically conductive cut piece with specific connection sections and a strip-shaped winding section, which is then deformed around a bending die to create a winding piece with consistent width and thickness.
This method results in a winding strip with improved electrical properties and mechanical integrity, allowing for fully automatic formation of an inductive component with an integral winding strip.
Smart Images
Figure 2025518614000001_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a method for forming a winding piece for an inductive component. The present invention further relates to an inductive component comprising an integral winding piece having a first connection section and a second connection section.
Summary of the Invention
Problems to be Solved by the Invention
[0002] The problem of the present invention is to improve a method for forming a winding piece for an inductive component and an inductive component having an integral winding piece.
Means for Solving the Problems
[0003] According to the present invention, in a method for forming a winding piece for an inductive component, the following steps are provided: forming a planar, integral and electrically conductive cut piece, the wound cut piece being integrally formed and having at least one first connection section, a second connection section, and a strip-shaped winding piece section having a certain width; and deforming the planar cut piece by winding the winding piece section around a bending die to form a winding piece.
[0004] In the case of a winding strip for an inductive component, especially a winding strip provided for a high current intensity, if the connection section has to be joined to the winding wire, for example by soldering or welding, there are drawbacks with respect to the electrical properties. The joint in principle has different electrical properties from the connection section and / or the winding wire. However, there are problems with mechanically and especially fully automatically forming an integral winding strip. In the method according to the invention, the winding strip is formed from a planar, integral and electrically conductive cut piece which has a first connection section and a second connection section. These connection sections are used to connect to other electrical components, for example a current supply or other electrical circuits. A strip-shaped winding strip section having a constant width is integrally joined to the two connection sections. Since this winding strip section has a constant width, the resulting winding strip has good electrical properties. This is because the winding strip section having a constant width behaves like a conventional winding wire. The strip-shaped winding strip section also has a constant thickness over its entire length and accordingly a constant ohmic resistance. Furthermore, deforming the planar connection piece to form the winding strip is done by winding the winding strip section around a bending die. Winding a winding wire around a bending die is of course known. Surprisingly, when the geometric shape of the flat cut piece is carefully selected, the strip-shaped winding strip section can also be wound around the bending die in a very simple way and at the same time the connection sections in the resulting winding strip remain accessible. For example, these connection sections are arranged such that they are located in a common plane and can then be soldered onto a printed circuit board, for example by a soldering surface. By the method according to the invention, a winding strip for an inductive component is obtained in a very simple way and the winding strip is integrally formed.
[0005] In a development of the invention, to form the winding strip, the winding strip section is wound around a cylindrical bending die, whereby the winding strip section assumes a helical shape.
[0006] The normal shape of the strip for the induction component is a helix. Surprisingly, when the shape of the cut piece is properly formed, a helix can also be formed by an integral and planar cut piece.
[0007] In the development of the present invention, the bending mold is made of a magnetically conductive material and forms the core of the induction component after the formation of the strip.
[0008] Thereby, the core of the induction component can simultaneously provide a bending mold. For example, a planar cut piece is painted before deformation, thereby obtaining a layer that is not electrically conductive on its outside.
[0009] In the development of the present invention, the planar, integral and electrically conductive cut piece is formed by punching from an electrically conductive metal sheet.
[0010] In this way, the cut pieces are formed automatically and in large quantities in a very simple manner.
[0011] The problem of the present invention is also solved by an induction component having an integral strip, in which case the strip has a first connection section, a second connection section and a strip section of a strip shape with a certain width, and the strip is formed by winding a planar cut piece around a bending mold.
[0012] In the development of the present invention, a core made of a magnetic material is provided, and the strip section is wound around the core.
[0013] Other features and advantages of the present invention will become apparent from the claims and from the description of the preferred embodiments given below in connection with the drawings. The drawings show the following.
Brief Description of the Drawings
[0014]
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
DETAILED DESCRIPTION OF THE INVENTION
[0015] Figure 1 shows a planar cut piece 10 for forming a wound piece for an inductive component. The cut piece 10 has a first connection section 12 and a second connection section 14. The two connection sections 12, 14 are provided for connection to an electrical circuit, such as a current supply, in the resulting wound piece. Each of the connection sections has a general rectangular contour with a U-shaped notch. The U-shaped notch can be used, for example, to orient the connection sections 12, 14 of the resulting wound piece in contact with positioning pins on a printed circuit board.
[0016] A wound piece section 20 is provided between the two connection sections 12, 14, and the wound piece section is formed in a strip shape and has a constant width. Further transition sections 22, 24 are provided between the wound piece section 20 and the connection section 12, respectively, and the side edges of the transition sections are each arranged at an angle greater than 90° with respect to the side edges of the wound piece section 20. However, the side edges of the transition sections 22, 24 are arranged perpendicular to the side edges of the connection sections 12, 14 to which they transition. The transition sections 22, 24 are provided to ensure a transition from a helical winding to the planar connection sections 12, 14 in the normal manner after deformation.
[0017] The winding piece section 20 is arranged obliquely with respect to the facing side edges of the connection sections 12, 13. As a result, as a whole, a zigzag shape of the cut piece is formed. In that case, the angle between the connection sections and the length of the winding piece section 20 can also determine the twist angle of the resulting winding piece and the number of windings of the winding piece. The connection sections 12, 14 are wider than the winding piece section 20.
[0018] Figure 2 shows a side view of the cut piece 20. The cut piece 20 has a constant thickness over its entire area. The cut piece 20 is punched out from, for example, a metal sheet of a constant thickness.
[0019] Figure 3 shows the cut piece 20 as seen from above.
[0020] Figure 4 shows the winding piece 30, which is formed from the planar cut piece 20 by winding the winding piece section 20 in a bending mold. The spiral shape of the winding piece section 20 can be seen. Furthermore, it is recognized that the connection sections 12, 14 are arranged in the same plane and have not been deformed. The transition sections 22, 24 form a transition between the connection sections 12, 14 arranged in a planar and common plane and the winding piece section 20 deformed at an angle.
[0021] The winding piece 30 has a helix, and the helix has a total of four windings. The number of windings can be changed by varying the length of the winding piece section 20 or by the diameter of the bending mold used during winding.
[0022] Figure 5 shows an inductive component 40 having a winding strip 30. Inside the hollow chamber formed by winding, a core 50 made of a magnetically conductive material is disposed. The core 50 is formed in a cylindrical shape and at the same time forms a bending mold when forming the winding strip 30. For example, the connection section 12 is fixed within a winding machine, and then the winding strip section 20 is wound around the core 50 which also forms a bending mold, thereby creating the spiral shape of the winding strip 30. Subsequently, the connection section 14 is arranged to be in the same plane as the connection section 12.
[0023] Subsequently, the inductive component 40 can be coupled onto a printed circuit board by bonding pads via the connection sections 12, 14.
[0024] According to the present invention, it becomes possible to form an inductive component having an integral winding strip fully automatically.
Claims
1. A method of forming a winding piece (30) for an induction component (40), comprising: forming a planar, integral and electrically conductive cutting piece (10), said cutting piece (10) having at least one first connection section (12), a second connection section (14), and a strip-shaped winding piece section (20) with a constant width, forming the cutting piece (10); deforming the planar cutting piece (10) by winding the winding piece section (20) around a bending mold to form the winding piece (30); and having.
2. The method according to claim 1, wherein the winding piece section (20) is wound around a cylindrical bending mold to form the winding piece (30), and the winding piece section (20) obtains a spiral shape.
3. The method according to claim 1 or 2, wherein the bending mold is made of a magnetically conductive material, and a core (50) of the induction component is formed after the formation of the winding piece (30).
4. The method according to any one of claims 1 to 3, wherein the planar, integral and electrically conductive cutting piece (10) is formed by punching from an electrically conductive metal sheet.
5. An induction component (40) having an integral winding piece (30), said winding piece (30) having a first connection section (12), a second connection section (14), and a strip-shaped winding piece section (20) with a constant width, and said winding piece (30) being formed by winding around a bending mold from a planar cutting piece (10).
6. The induction component according to claim 5, wherein a core (50) made of a magnetic material is provided, and the winding piece section (20) is wound around the core.