JP2006120669A - Inductance coil capable of detecting current - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inductance coil capable of detecting a current signal directly without connecting a microohm element to the outside. <P>SOLUTION: A metal wire 21 having a small resistance temperature coefficient such as a nickel copper alloy and a manganese copper alloy is used instead of copper. Further, a metal wire 21 is wound as a spiral coil body 24, the spiral coil body 24 is stored in a mold filled with magnetic powder for molding, and both ends of the metal wire 21 in which a coil sealing body 3 is not molded for exposure are set to be electrodes 51, 52. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an inductance coil capable of detecting a current, and more particularly to an inductance coil formed of a nickel copper alloy or a manganese copper alloy metal wire.

  Currently, computer-related products manufactured using advanced technology are required to have the harsh conditions of being light, thin, short and small. In addition, in the structure and manufacturing method of the inductance coil used for these related products, many improved methods corresponding to this requirement have been proposed internationally.

  For example, the appearance of an inductance coil improved in Patent Document 1 is shown in FIG. 1A. As shown in FIG. 1A, the inductance coil 10 is attached to the circuit board 12 and includes a main body 14, and a first electrode portion 16 and a second electrode portion 18 extending from the main body 14. Both electrode portions 16 and 18 are welded to welding points 20 and 22 on the circuit board 12, respectively.

  Next, the structure and manufacturing method of the inductance coil of Patent Document 1 will be described with reference to FIGS. 1B and 1C. As shown in FIG. 1B, the inductance coil 10 is composed of a helical coil body 24 composed of a multiplicity of windings 30 of a flat conductive wire having a rectangular cross section. The helical coil body 24 includes an inner end 26 and an outer end 28, and a lead frame 32 including a first conductor 36 and a second conductor 40 includes both end portions 34 of the first and second conductors 36, 40. 38 are integrally welded to the inner end 26 and the outer end 28 of the main body of the helical coil 24, respectively.

  Thereafter, as shown in FIG. 1C, the helical coil body 24 including the first conductor 36 and the second conductor 40 is placed on a mold, and a magnetic material is injected and molded. The spiral coil main body 24 taken out from the mold cuts the lead frame 32 along the cross-sections 42 and 44 to complete the inductance coil 10.

  However, the following problems are observed in the inductance coil of Patent Document 1 thus finished.

  (1) Since the electrode parts 16 and 18 are separately manufactured and welded, the manufacturing process cannot be simplified and the production cost increases.

  (2) Since the manufacturing process is complicated, the defect rate of products increases.

  (3) Since the coil wire is a copper wire, the temperature coefficient of resistance (TCR) tends to be slightly higher than that of a copper alloy, and it is impossible to detect a current signal using its direct current resistance (DCR) as it is. Impossible. Therefore, a current detection resistor (hereinafter referred to as a micro-ohm element) must always be connected in series to the outside, and this circuit configuration increases the production cost.

In view of the above facts, in order to improve the above-mentioned drawbacks, the inventor of the present application is based on experience engaged in the art for many years, and as a result of long-term studies, the development of the present application will finally show success. It came.
US Pat. No. 6,204,744

  The present invention provides an inductance coil capable of detecting a direct current signal without connecting a micro-ohm element outside the inductance coil by using a copper alloy wire having a resistance temperature coefficient smaller than copper and a stable resistivity. The purpose is to do.

  Another object of the present invention is to save the labor of manufacturing and welding an electrode part separately, simplify the manufacturing process, and suppress the production cost.

To achieve the above objective,
(1) An inductance coil capable of detecting a current according to the present invention includes a coil main body formed of a nickel-copper alloy metal wire, a coil sealing body that houses the coil main body, and an electrical connection to the coil main body. And an electrode portion extending to the outside of the coil sealing body.

  (2) An inductance coil capable of detecting a current according to the present invention includes a coil main body formed of a manganese copper alloy metal wire, a coil sealing body that accommodates the coil main body, and an electrical connection to the coil main body. And an electrode portion extending to the outside of the coil sealing body.

  (3) The coil body portion is a winding portion in which the metal wire is wound spirally, and the coil sealing body is molded so as to surround the winding portion, and the electrode portion is The coil sealing body is not molded and is exposed at both ends of the metal wire.

  (4) A concave portion is formed on the top surface of the coil sealing body in parallel with the extending direction of the electrode portion, and the electrode portion is folded and placed in the concave portion.

  According to the present invention, since the inductance coil uses a metal wire of nickel copper alloy or manganese copper alloy for the winding, the signal current can be detected without connecting a micro-ohm element to the outside.

  In addition, since the electrode portions are formed by extending both ends of the coil, it is possible to save the trouble of separately manufacturing the electrode portions and welding them to the coils, simplifying the manufacturing process and reducing the production cost.

  Embodiments of the present invention will be described below with reference to the drawings. In addition, the same code | symbol was used for the same member in a figure.

  The inductance coil of the present invention uses a metal wire having a small resistance temperature coefficient, such as nickel copper alloy or manganese copper alloy, instead of copper. Then, the metal wire is wound to form a spiral coil body, the spiral coil body is housed in a mold filled with magnetic powder, and the both ends are coil-sealed with magnetic powder. It is extended from the stationary body and used directly as an inductance coil electrode.

  Next, a perspective view of the inductance coil according to the present invention is shown in FIG. In particular, FIG. 2 shows a state before sealing with the coil sealing body. As shown in FIG. 2, the helical coil main body 24 has a rectangular cross section and a flat and long metal wire 21 as a base material. The spiral coil main body 24 is formed by continuously winding the metal wire 21. 24. More specifically, the helical coil body 24 is formed by winding a wide flat surface of the metal wire 21 substantially perpendicular to the winding axis direction. Both ends of the metal wire 21 form extension portions 51 and 52, respectively, and finally become electrode portions that are extended to the outside of the coil sealing body. The extending portions 51 and 52 are extended in opposite directions toward the radially outer side of the helical coil main body 24, respectively. Further, it is desirable that the extending portions 51 and 52 are substantially aligned in the winding axis direction. In the present embodiment, the extended portion 51 extended from the lower surface of the spiral coil body portion 24 is once bent toward the spiral coil body portion 24, and further on the upper surface of the spiral coil body portion 24. The spiral coil body 24 is bent outward in the radial direction. The metal wire 21 is a nickel copper alloy or a manganese copper alloy, and a winding machine or the like is used to finish the spiral coil main body 24. Further, the extending portions 51 and 52 correspond to electrode portions in a state where the inductance coil is completed.

  Next, the finished spiral coil main body 24 is placed in a mold, and the extending portions 51 and 52 are exposed to the outside of the mold. Fill the mold with magnetic powder and completely enclose the helical coil body 24 so that there is no space between the mold and the helical coil body 24 that is not filled with magnetic powder. Molding (for example, compression molding) is performed. In the present embodiment, as described above, since the heights of the extending portions 51 and 52 in the winding axis direction coincide with each other on the upper surface of the spiral coil main body 24, the configuration of the mold is simplified. The boundary surface with the upper die of the lower mold may be flat in the entire region, and a groove having a width and depth sufficient to allow the extending portions 51 and 52 to extend is formed on the boundary surface with the lower mold of the upper die. Just form it. As a result, as shown in FIG. 3, an inductance coil in which the helical coil body 24 is wrapped with the coil sealing body 3 is finished. Extending portions 51 and 52 extend outside the coil sealing body 3. The mounting technique itself for compression molding of magnetic powder is the same as a general compression molding technique except that a mixed powder obtained by mixing magnetic powder and a binder is used, and thus detailed description thereof is omitted.

  Further, the coil sealing body 3 is formed with concave portions 53 and 54 in parallel with the direction in which the extended portions 51 and 52 are extended by molding. When the top surface of the coil sealing body 3 is viewed from the front, the recesses 53 and 54 are rectangular and are formed from one side of the top surface toward the center of the top surface. The widths of the recesses 53 and 54 are larger than the widths of the extension parts 51 and 52, and the lengths of the recesses 53 and 54 are the lengths of the extension parts 51 and 52 that are bent and cover the top surface of the coil sealing body 3. Bigger than that. Furthermore, the depths of the recesses 53 and 54 may be approximately the same as the thickness of the metal wire 21 that is the base of the extension portions 51 and 52, and are preferably slightly smaller than the thickness.

  Next, the extending portions 51 and 52 are folded back toward the top surface of the coil sealing body 3, and are housed and placed in the recessed portions 53 and 54. As a result, the extended portions 51 and 52 can be directly used as electrode portions extended to the outside of the coil sealing body 3. When the extended portions 51 and 52 at both ends of the metal wire 21 constituting the spiral coil 24 are used as they are as the electrode portions as in the present embodiment, the electrode portions are separately manufactured using a lead frame or the like. There is a risk that the strength of the electrode part may be insufficient compared to the case where the extension parts 51 and 52 used as the electrode part are accommodated in the concave parts 53 and 54 and fixed in this embodiment. Misalignment, deformation, and twisting of the electrode portion are prevented. In particular, since the recesses 53 and 54 can be formed at the same time when the magnetic powder is molded, a separate process and members are not required to form the recesses 53 and 54, and the manufacturing process is simplified. And saving of material can be realized. The extending portions 51 and 52 may be fixed in the recesses 53 and 54 by fitting, or may be fixed in the recesses 53 and 54 with an adhesive or the like.

  As described above, the main feature of the inductance coil of the present invention is that the winding uses a metal wire having a small resistance temperature coefficient such as nickel copper alloy or manganese copper alloy instead of copper. According to such a configuration of the present invention, even if the current flowing through the coil body increases, the DC resistance of the coil body is less affected by temperature. Moreover, since the resistivity of such a coil material is stable, the DC resistance of the coil is more stable than a coil wound with a copper wire.

  The present invention can be implemented in other forms without departing from the technical idea of the present invention. The above-described embodiments are merely to clarify the technical contents of the present invention, and are not limited to such specific examples, and should not be interpreted in a narrow sense. Various modifications can be made within the scope of the claims.

It is an external view which shows an example of the conventional inductance coil. It is a figure which shows the structure and manufacturing method of the inductance coil shown by FIG. It is a figure which shows the structure and manufacturing method of the inductance coil shown by FIG. It is a perspective view of the state before the inductance coil in embodiment of this invention is sealed with a coil sealing body. It is an external view of the inductance coil in embodiment of this invention.

Explanation of symbols

3 coil sealing body,
21 metal wire,
24 spiral coil body,
51, 52 Extension part (electrode part),
53, 54 Recess.

Claims (4)

A coil body formed of a nickel copper alloy metal wire,
A coil sealing body for housing the coil main body,
An inductance coil capable of detecting a current, comprising: an electrode portion electrically connected to the coil main body portion and extending to the outside of the coil sealing body. A coil body formed of a manganese copper alloy metal wire;
A coil sealing body that houses the coil main body, and
An inductance coil capable of detecting a current, comprising: an electrode portion electrically connected to the coil main body portion and extending to the outside of the coil sealing body. The coil body portion is a winding portion in which the metal wire is wound spirally, and the coil sealing body is molded to wrap around the winding portion,
3. The inductance coil according to claim 1, wherein the electrode portions are both end portions of the metal wire that are exposed without the coil sealing body being molded. 4. A concave portion is formed on the top surface of the coil sealing body in parallel with the direction in which the electrode portion is extended,
The inductance coil according to claim 1, wherein the electrode part is folded and placed in the recess.

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