JPH08264315A - Support body for coil which can be brought into magnetism and/or magnetized - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a manufacturing mechanical tolerance of an iron core and a winding frame from causing an adverse effect by a method wherein the winding frame and the open-type iron core formed of magnetic or magnetizable material are formed in one piece. SOLUTION: A winding support 1 is provided with two projections 2 and 3, the projections 2 and 3 are made to surround a room 4, and a coil winding is housed in the room 4. It is preferable that the winding support 1 is manufactured at the same time when the iron core and the winding frame are formed through injection molding. It is preferable that the winding support 1 is formed of a single ingredient, for instance, composite material composed of ferrite and polymer. Or, the winding support body 1 is composed of, at least, two different ingredients and can be turned magnetic or magnetizable, and at least one of them is turned to an electrically insulating and non-magnetic material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coil magnetic and / or magnetizable winding support comprising a winding frame and an open core made of a magnetic material or a magnetizable material.

[0002]

2. Description of the Related Art When an open type iron core is used, the coil winding is wound on a winding frame made of a plastic material and is entirely fitted on the iron core, as in the case of a closed type iron core. . The coil thus produced is then molded to secure and protect its components. If maintaining a certain inductance value or external magnetic field distribution is a problem in its use, this depends on the exact positioning of the winding with respect to the core. In the case of short coils, this placement effect is even greater than the effect caused by variations in the material permeability. This disposition variation actually occurs during winding and during assembly of the components due to mechanical tolerances in the manufacture of the core and reel.

[0003]

SUMMARY OF THE INVENTION It is an object of the invention to provide a magnetically or magnetizable winding support in which the disadvantages indicated with regard to the above-mentioned layout influence are largely eliminated.

[0004]

In order to solve this problem, according to the present invention, the winding frame and the iron core are integrally formed in the winding support member mentioned at the beginning.

This has the advantage that the coil windings are positioned in a fixed relationship with respect to the iron core.

Preferably, the winding support is at least partially composed of a ferrite-polymer composite (FPC). In this case, the winding carrier may consist entirely of one component, namely the FPC, or have at least two different components.

The winding support is advantageously made by injection molding.

[0008]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 shows a cross-sectional view of a winding support, and FIGS. 2 and 3 show the magnetic field strength distribution of a coil with a winding support according to the invention, with a conventional split winding support. Shown in comparison with the coil.

FIG. 1 shows a cross section of the winding support 1. The winding support 1 is in this case formed with two protrusions 2, 3 which surround a chamber 4 in which the winding of the coil is mounted.
Since the winding is directly attached by forming the winding support 1 with a coil integrated in the iron core, there is no effect on the consistency of the magnetic action of the mechanical tolerances of the divided components. The winding support 1 is produced by simultaneous production of the iron core and the winding frame, preferably by known injection molding.

The winding support 1 is preferably formed of one component, for example FPC. However, the winding support 1 can also consist of at least two different constituents, all of which are magnetic or magnetizable, at least one of which is an electrically insulating, non-magnetic material.

In a conventional winding support consisting of two parts, one of the protrusions 2 or 3 belongs to the winding frame and is therefore made of a non-magnetic material. Therefore, the magnetic field distribution around the coil made of the winding support according to the invention should normally be considered less favorable than in the case of a conventional winding support consisting of two parts.
This is because by forming both protrusions with a magnetic material or a magnetizable material, concentration of lines of magnetic force, and thus attenuation of the magnetic field, is expected.

Surprisingly, however, it has been found that the integral winding support according to the invention provides a magnetic field strength distribution in the periphery which is better than in conventional winding supports.

2 and 3, the magnetic field strength Bz (T) in the case of a coil mounted around a metal cylinder.
Indicates. 2 relates to a measurement radius r of 5 mm, and FIG. 3 shows a case where the measurement radius r is 15 mm. Curve A
In that case relates to a conventional coil with a winding wound on a bobbin and an open core, the curve B being a coil made with a winding support made according to the invention. It is about.

As is apparent from FIGS. 2 and 3, surprisingly, a higher magnetic field strength is obtained around the coil provided with the winding support according to the invention than in the case of a conventionally shaped coil. To be

This is of particular advantage in applications where the transfer of energy is to be effected by a magnetic field, such as when operating without batteries, as is the case, for example, in the case of start blocking in motor vehicles.

[Brief description of drawings]

1 is a cross-sectional view of a winding support according to the present invention.

FIG. 2 is a diagram comparing the magnetic field strength distribution of a coil provided with a winding support between the case of the present invention and the conventional case.

FIG. 3 is a diagram comparing the magnetic field strength distribution of a coil provided with a winding support between the case of the present invention and the conventional case.

[Explanation of symbols]

 1 Winding support 2, 3 Projection 4 chamber

Front Page Continuation (71) Applicant 390041508 Siemens, Matsushita, Components, Gezershyaft, Mitt, Besilyenktel, Haftung, und, Companion, Komandite, Geemshyaft Siemens AFAT COGUSKH CONTACT Miyun Heng (No house number) (72) Inventor Mauricio Esguera Federal Republic of Germany 82008 Unterhatsu Hing Walberg Syutrase 16

Claims (5)

[Claims] 1. A magnetic and / or magnetizable coil comprising a winding frame and an open-type iron core made of a magnetic material or a magnetizable material, wherein the winding frame and the iron core are integrally formed. Winding support. 2. Winding support according to claim 1, characterized in that the winding support (1) consists at least partly of a composite material of ferrite and polymer. 3. Winding support according to claim 2, characterized in that the winding support (1) consists of one component. 4. Winding support according to claim 2, characterized in that the winding support (1) consists of at least two different constituents. 5. The winding support (1) is produced by injection moulding.
Winding support according to item 1.