JPS60224208A - Manufacture of transformer for noise interrupting - Google Patents

Abstract

PURPOSE:To reduce a production cost and to attain manufacturing with high reliability, by fitting primary and secondary coils which are magnetic-shielded by sealing the coils in the core pieces with covers, around annular magnetic core sections being cut at one or more portions, and by integrating the annular magnetic core sections. CONSTITUTION:Annular coils 1, 2 each having a hollow are fitted into core pieces 7, 8 each having an opening 9 at the central portion of the annular groove 11 and consisting of magnetic material with a high permeability at a higher frequency, with the each hollow and each opening 9 of the core pieces 7, 8 aligned. Thereafter, coil sealing bodies (a primary coil and a secondary coil) 17, 18 are constituted by sealing the annular grooves with covers 13, 14 each having the same material and the same shape as the core pieces 7, 8. In this case, lead wires are drawn out of the portions joining the core pieces 7, 8 and the covers 13, 14. Next, after the coil sealing bodies are fitted around the annular magnetic core sections 25, 26 being cut at one or more portions, the cut portions of the magnetic core sections 25, 26 are joined to integrate into the whole annular magnetic core.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a noise-blocking transformer that blocks noise that intrudes into electronic equipment, causes the equipment to malfunction, and in the worst case can lead to destruction of the equipment.

[Prior Art] Conventionally, noise generated by various causes spans a wide frequency band and has various energies, so it is almost impossible to uniformly remove all noise.

Moreover, with the progress of semiconductor technology, the processing speed of electronic devices has become faster and the signals handled have become smaller, so measures against noise have become particularly important in recent years.

Broadly speaking, these noises can be divided into two types: radiated noise that is emitted from the noise source into space and directly hits the electronic equipment, and noise that propagates from the noise source to the primary power supply and enters from the conductive path of the electronic equipment. Become. Among these, a method of electrostatically and magnetically shielding the entire electronic device individually is a common method for dealing with the radio noise, and countermeasures are taken depending on the usage status of the electronic device.

However, electronic equipment must always supply power to the noise that enters through the conductor, so only the necessary components are selected from the electrical energy propagating through the conductor.
Unnecessarily blocking noise components is complicated because noise has a wide range of energy distribution in a wide frequency band as described above.

As a device for removing noise propagating through this conductive line, a magnetic path for interference waves is disclosed in Japanese Patent Publication No. 56-35290.
Disconnect device is enabled.

However, since the above device has a complicated structure in which the circumferential surfaces of the primary and secondary coils of the transformer are wrapped in different magnetic materials, there are problems such as a large number of manufacturing steps and high manufacturing costs. It was something that I had.

[Object of the invention] The present invention has been made to solve the above problems,
To provide a method for manufacturing a noise-blocking transformer that can reduce production costs and achieve highly reliable commercialization by manufacturing a transformer having the above-described structure with good noise-blocking performance using a method most suitable for productivity. It is an object.

[Structure of the Invention] The structure of the present invention for achieving the above object includes a core piece made of a magnetic material with high high frequency permeability and having a through hole in the center of an annular groove, and a ring coil having a hollow portion. , the hollow part and the through hole of the core piece are aligned and loaded into the annular groove, and the cover piece is made of a magnetic material with high high frequency permeability and has a through hole in the center part; and the through-hole of the lid piece to seal the annular groove to form a coil seal, and then fit the coil seal together with other coils into the annular magnetic core that has been cut at one or more places. The gist of the present invention is a method of manufacturing a noise-blocking transformer, which is characterized in that the cut portions of the magnetic core are attached and assembled into an annular body.

The annular coil used in the present invention is formed by winding an ordinary lead wire insulated with a metal wire of good conductivity, such as a copper wire, around the circumferential surface of a cylinder or a prism.

The material used for the core piece is commercial frequency 5.
Magnetic permeability is low at low frequencies of several tens of H7 to several hundred H7, including the frequency band of about 0Hz to 60H2, and conversely, the permeability is low at frequencies of several hundred K1-12 to several hundred H7.
A material having high magnetic permeability at a high frequency of several MH7, such as a magnetic powdered iron plate, a plate-shaped body formed from a metal oxide fired magnetic material, a thin sheet body, and a sintered body mixed with magnetic powder, is used.

A core piece is made of these materials and has an annular groove formed to have a through hole in the center.

The cover piece is also made of a material with the same magnetic permeability as the core piece, and its shape is similar to that of the annular coil after the annular coil is loaded into the annular groove of the core piece.

The coil can be integrally attached to the annular groove so as to be completely sealed within the annular groove, and a through hole is provided in the center thereof to align with the through hole of the core piece after integral attachment.

Therefore, the coil sealed body consisting of the above-mentioned ring-shaped coil, core piece, and lid piece has a ring-shaped coil whose entire circumferential surface is shielded with a material having high high-frequency magnetic permeability, and which has a through hole in its center. It is.

Here, to connect the core piece and the lid piece, a hardening synthetic resin mixed with magnetic powder is applied as an adhesive to the mounting surfaces of both members so that it has almost the same magnetic permeability as the core piece and the lid piece. After bonding the two parts together, the hardening synthetic resin can be hardened by heat treatment or mixing a hardening agent depending on its properties, or similarly, rivets or the like made of a material with approximately the same magnetic permeability are formed and attached mechanically. It is possible to use techniques such as In addition, either chemical or mechanical attachment may be employed as long as the magnetic path between the core piece and the lid piece having high high frequency magnetic permeability is magnetically connected.

Note that it is preferable that the core piece and the lid piece have the same shape and the same material because this allows for more efficient parts management and simplification of the manufacturing process.

The magnetic core may be made of a material and shape that has high low-frequency magnetic permeability and low high-frequency magnetic permeability, such as a silicon steel laminate, or any material that can be formed into an annular shape, for example, by forming a part of the annular shape. A cut piece or a ring-shaped piece cut into two parts are used.

Preferably, a pair of mouth-shaped magnetic paths are integrated into an annular shape.

The above-mentioned technique for joining the core piece and the lid piece is used to join the cut surfaces when assembling it into an annular shape, thereby forming an annular magnetic path with high low frequency magnetic permeability as a whole.

Embodiments of the present invention will be described below with reference to the drawings.

[Example] FIG. 1 is an explanatory diagram showing all the components used in the method of manufacturing a noise-blocking transformer according to the present example so that the mutual relationships during assembly are clear.

In the figure, reference numeral 1.2 represents a coil, in which a lead wire 5 is wound at a predetermined winding ratio to form a hollow rectangular tube shape. 7 and 8 are core pieces into which the coils 1 and 2 are loaded, and FIG. 2A shows a plan view thereof, FIG. 2B shows a side view, and FIG. The core piece 7.8 is manufactured from a magnetic dust iron plate, which is a material with high magnetic permeability at high frequencies, and its center has a rectangular cylindrical through hole with an area slightly larger than the cross-sectional area of the magnetic core, which will be described later. In order to load the primary and secondary coils 1.2, the annular groove 11 has an outer circumference larger than the outer circumference of the coil and an inner circumference smaller than the inner circumference of the coil.

Numeral 13.14 is a cover piece made of a material having high magnetic permeability at high frequencies, like the coil piece 7.8. In this embodiment, the lid piece 13.1 is made of exactly the same material and the same shape as the core piece 7.8.
4, manufacturing is further simplified.

Therefore, as shown in FIG. 1, the coil 1.2 is connected to the core piece 7.
8, the annular groove 11 of the core piece 7.8 can be sealed with the cover piece 13.14, and the coil 1.2 is completely enclosed in a sealed space with a material having high high frequency magnetic permeability. . A synthetic resin adhesive mixed with ferrite powder is used to join these two members together.

In addition, at this time, the lead wire 5 is connected to the core piece 7.8 and the lid piece 1.
3. It is led out from the joint of 14.

The coil 1, core piece 7, and lid piece 13 configured by the above steps form a primary coil 17, and the coil 2, core piece 8, and lid piece 14 form a secondary coil 18. FIGS. 3A and 3B show a perspective view and a BB' cross-sectional view of the primary and secondary coils 17 and 18 formed in this manner.

As shown in the figure, the coil 1.2 formed by winding the lead wire 5 is sealed in a box body 21 (22) with high high frequency magnetic permeability, and is completely magnetically shielded from high frequency magnetic fields. .

25.26 in Fig. 1 is a mouth-shaped magnetic core made of a silicon steel laminate, which is a material that has high magnetic permeability at low frequencies and extremely low magnetic permeability at high frequencies compared to the box body 21.22. . A perspective view of only the magnetic cores 25 and 26 is shown in FIG. As shown in the figure, both have the same shape and are made of the same material, and together form an annular low-frequency magnetic path. 27 in the figure
is a thin silicon steel plate with a mouth shape. As is clear from the illustration in FIG. 1, the legs 23 of the magnetic cores 25, 26 are for inserting the primary and secondary coils 17, 18. Therefore, leg 2
The length of the through hole 3 is longer than at least the length of the through hole 9. To join the two magnetic cores, a commonly used method is used in which silicon steel plates in alternately protruding shapes are brought together and fitted together.

FIG. 5 is a perspective view of a noise isolation transformer completed by the method of this embodiment. As shown in the figure, the primary and secondary of this transformer have a core core 25.0 as a common low frequency magnetic path.
For example, the commercial frequency is 50Hz, 60Hz.
The Hz magnetic fields interlink with each other's coils, allowing energy to propagate.

However, all of the energy belonging to high frequency bands such as noise generates magnetic fields only in the boxes 21 and 22 of the primary and secondary coils 17 and 18, and is consumed only in these boxes as eddy currents, hysteresis losses, etc. Noise energy is not propagated between the primary and secondary coils 17, 18. That is, it exhibits all the effects of the conventional noise-blocking transformer.

As described above, according to the method of this embodiment, the coil 1.2 is combined with the core piece 7.8 and the lid piece 1, which are configured in exactly the same shape.
Completely sealed and magnetically shielded by 3.14,
Further, by a very simple method of fitting the magnetic cores 25 and 26 into the leg portions 23 having the same shape, it is possible to manufacture a transformer having the same effect as the conventional noise-blocking transformer.

Moreover, as is clear from FIG. 1, the components of the coil 1.2 include a core piece 7.8 made of the same material and the same shape;
Lid pieces 13 and 14 and magnetic core 2 made of exactly the same material and shape
It can basically be constructed from three types of parts: 5.26. Therefore, this is an excellent method for manufacturing a noise-blocking transformer that can simplify parts management, process management, quality control, etc. in manufacturing.

[Effects of the Invention] As described above with reference to examples, the method for manufacturing a noise isolation transformer according to the present invention includes loading two coils into annular core pieces each having a through hole, and using a lid piece. This is a method of integrating the annular magnetic core by fitting the primary and secondary coils 1, which have been magnetically shielded by sealing the coils in the core piece, into an annular magnetic core that has been cut at one or more points. .

Therefore, it is an excellent method that does not require the use of any special equipment during production and can be produced simply and quickly. Moreover, the noise-blocking transformer manufactured by this method has exactly the same functions and effects as conventional ones, and does not cause any deterioration in performance.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram of one embodiment, Figure 2 shows the core piece or cover piece, Figure (A) is a plan view, Figure 4 is a perspective view of the magnetic core, and Figure 5 is the completed version. The perspective view of the noise isolation transformer is shown. 1.2 Coil 7.8 Core piece 13.14 Lid piece 25.26 Magnetic core agent Patent attorney Tsutomu Sadatsu et al. Figure 1 5 78 Figure 2 77 9 77 77 9 77 Figure 3 Figure 4 - Average

Claims (1)

[Claims] 1. A circular coil having a hollow part is attached to a core piece made of a magnetic material with high high frequency permeability and has a through hole in the center of an annular groove, and a circular coil having a hollow part is inserted through the hollow part and the core piece. A lid piece made of a magnetic material with high high frequency permeability and having a through hole in the center is loaded into the annular groove with the core piece aligned with the through hole of the lid piece. to form a coil seal by sealing the annular groove, and then fitting the coil seal together with other coils into the annular magnetic core that has been cut at one or more points, and attaching the cut portion of the magnetic core. A method for manufacturing a noise-blocking transformer, characterized in that the transformer is assembled into a ring-like integral piece. 2. The noise isolation according to claim 1, wherein the annular magnetic core is cut into a pair of opening shapes, and the coil sealing body is fitted to both legs of the annular magnetic core. manufacturing method for transformers. 3. Any one of claims 1 to 2, wherein the other coil is the same as the coil sealing body.