JPH02177409A - Manufacture of electrostatically shielded transformer - Google Patents

Abstract

PURPOSE:To electrostatically shield a coil easily in manufacturing it by relatively simple work by covering the outside of an insulating member on the surface of a coil with a shielding member, with space therein, which is in liquid form in coating and forms a conductive film after coating, and then covering the space with a conductive tape through an insulating tape. CONSTITUTION:The surface of a coil 11, which generates a magnetic field, is covered with an insulating member 12, and then the outside of the insulating member 12 is covered with a shielding member 13, which passes the magnetic field and shields an electric field that occurs incidentally to the magnetic field and is in liquid form in coating and forms a conductive film at the surface of the insulating member 12 after coating, such that the space 14 is provided in the shielding member 13 so that the short-circuit currents by inductive voltage generated by electromagnetic induction may not flow. Thereafter, at least one end of the shielding member 13, which is separated by said space 14, is covered with an insulating tape 15, and further said space 14 is covered with a conductive tape 16 through the insulating tape 15 so as to form at least one set or more of layers, consisting of the insulating members 12 and the shielding members 13, at the outside, thus the coil 11 is electrostatically shielded by the use of the shielding member 13.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method of manufacturing an electrostatic shield transformer that removes high frequency noise and the like that invades due to supplied power.

(Prior Art) In general, a transformer uses an electromagnetic induction effect of a primary coil wound around an iron core to manually apply voltage from the outside of the secondary coil or from the secondary coil wound around the same iron core to the secondary coil. It is designed to output an electromotive force according to the

In such a transformer, for example, the primary coil is connected to an external power transmission line, etc., and the secondary coil is connected to equipment, etc., so that a predetermined voltage for operating equipment, etc. from the voltage during power transmission can be obtained. It can be transformed into a voltage, and the resulting power can be supplied to equipment, etc.

However, in such transformers, high-frequency noise may enter the primary coil via power transmission lines, etc., and such noise is transmitted to the secondary coil, causing equipment to malfunction. There is a possibility.

Therefore, conventionally, as shown in FIGS. 5 and 6, there is an electrostatic shield transformer in which a secondary coil is electrostatically shielded by a conductive member such as a copper plate.

The electrostatic shielding transformer 1 shown in FIG. 5 has a coil 3 partially wound around an annular iron core 2, and a conductive member 4 for electrostatically shielding a portion of the coil 3 on the outer side of the secondary coil 3. It is manufactured by winding a secondary coil 5 around the outer side surface of the conductive member 4.

In addition, the electrostatic shield transformer 1 shown in FIG.
It is manufactured by wrapping the secondary coil 5 around the iron core 2 in close contact with the other surface of the conductive member 4.

In this way, the conventional electrostatic shield transformer 1 has a conductive member 4 attached to the surface where the secondary coil 3 and the secondary coil 5 come into contact, and the conductive member 4 partially transmits electricity from the coil 3 to the secondary coil 5. It is designed to electrostatically shield high frequency noise etc.

(Problem to be Solved by the Invention) However, in transformers manufactured by such conventional manufacturing methods, noise may enter the secondary coil from the exposed portion of the secondary coil, and the was not electrostatically shielded.

In order to completely provide electrostatic shielding, it is necessary to cover the negative and secondary coils with metal foil, insulating cloth, etc. to remove such noise, but such work is complicated, so Conventionally, it has been difficult to automate this process.

Therefore, in the past, such work had to be done manually, resulting in poor productivity and difficulty in uniformly coating the coil with metal foil, etc., making it difficult to achieve uniformity of the product. Ta.

Furthermore, it is difficult to shield the coil from the outside with metal foil or the like due to such manual work, and as a result, it is not possible to completely eliminate such noise, etc.
There was a risk that malfunctions of equipment, etc. would occur.

The present invention has been made to solve these conventional problems, and provides a method for manufacturing an electrostatic rolled transformer that can easily manufacture and electrostatically shield a coil through relatively simple operations. The purpose is to provide.

(Means for Solving the Problems) In order to achieve the above object, the present invention covers the surface of a coil that generates a magnetic field with an insulating member that electrically insulates the coil from the outside, and then The shielding member passes through the magnetic field and shields the electric field generated incidentally to the magnetic field, and forms a conductive film on the surface of the insulating member, which is liquid at the time of coating and is conductive after coating. The outside of the insulating member is coated with a gap so that a short circuit current due to the induced voltage generated by the shielding does not flow, and then at least one end of the shielding member separated by the gap is covered with an insulating tape having an insulating property. Then, the gap is covered with a conductive tape having conductivity through the insulating tape, and at least one set of layers consisting of the insulating member and the shielding member is formed on the outside of the coil. The coil is characterized in that the coil is electrostatically shielded by the shielding member in an easy-to-manufacture manner.

(effect) The present invention, which has the features listed in item L, operates as follows.

A coil is previously formed into a shape suited to the intended use, and the surface of the coil is, for example, molded with resin and covered with an insulating member.

Next, masking tape is pasted on a part of the surface of this insulating member perpendicular to the winding direction of the coil, and this coil is
At the time of coating, it is in a liquid state, and after coating, it is dipped into a shielding member that forms a conductive film on the surface of the insulating member.

After that, the coil is taken out, a shielding member is formed into a film, and the masking tape is peeled off.
The shielding member can cover the surface of the insulating portion H by providing a gap that prevents the flow of a short circuit current due to an induced voltage generated by electromagnetic induction.

Furthermore, by covering this gap with a conductive tape via an insulating tape, the coil can be electrostatically shielded.

Therefore, it is possible to cover the coil with the shielding member relatively easily, and the shielding member and the conductive tape can provide reliable electrostatic shielding.

(Example) Below, a method for manufacturing an electrostatic shield transformer according to the present invention will be explained in detail based on the drawings.

FIG. 1 is an external view of an electrostatic shielding coil 10 manufactured by the method for manufacturing an electrostatic shielding transformer according to the present invention, and FIG. 2 is a sectional view taken along line AA in FIG.

The electrostatic shielding coil 10 shown in FIG. 1 has an insulating film 12 and a conductive film 13 on the surface of the coil 11, as shown in FIG.
, and an insulating film 12 in this order.

This insulating film 12 is made of an electrically insulating material, for example,
BMC, epoxy resin, etc. are molded with so-called resin,
It is formed on the surface of the coil 11.

The conductive film 13 is formed by attaching a conductive material having conductivity, for example, by plating a metal material, or by attaching a liquid conductive paint and then curing it. etc., and grounded.

Furthermore, as shown in the figure, the conductive film 13 covers the surface of the coil 11 with a gap 14 formed therein, so that even if the conductive film 13 is electromagnetically induced by the coil 11,
This prevents short-circuit current from flowing due to the induced voltage caused by this electromagnetic induction.

A strip-shaped insulating tape 15 is pasted to one end of the conductive film 13 in this gap 14 in a direction perpendicular to the winding direction of the coil 11. A conductive tape 16 is pasted.

The insulating tape 15 is a strip-shaped tape made of an electrically insulating material and easily attached with an adhesive, and serves to insulate the conductive film 13 and the conductive tape 16. There is.

The conductive tape 16 is a strip-shaped tape made of a conductive material and coated with a conductive adhesive that is also easy to apply.

The conductive tape 16 is connected to the end of the conductive film 13 to which the insulating tape 15 is not attached, and
It is pasted onto an insulating tape 15 so as to completely enclose the gap 14, and is designed to reliably block high frequency noise etc. passing through the gap 14.

Further, an insulating film 12 is formed on the surface of the coil 11 to which these tapes are attached and a conductive film 13 is formed, thereby completely insulating the conductive film 13 and the conductive tape 16 from the outside.

Therefore, the coil 11 is reliably electrostatically shielded by the conductive film 13 and the conductive tape 16.

Next, the manner in which such an electrostatic shielding coil 10 is manufactured will be explained based on FIG. 3.

FIG. 3 is a diagram showing the process of manufacturing the electrostatic shielding coil 10 by the method of manufacturing an electrostatic shielding transformer according to the present invention.

First, the conductive wire forming the coil 11 is wound around a jig having a shape (prismatic in this example) according to the application, and after this winding is completed, the jig is removed and the coil 11 is
form 1.

Then, the surface of the coil 11 thus formed is molded with a resin and the insulating material is attached thereto, thereby forming the coil 11 whose surface is covered with an insulating film 12, as shown in FIG.

The surface of this insulating film 12 is subjected to so-called masking treatment in order to form the gap in the next step.
At a minimum, the masking part should be made as flat as possible.

This is because if the surface is uneven, there is a risk that a gap will be formed between the masking tape 20 and the surface, and the liquid conductive material may enter this gap, making it impossible to form the gap 14. This is because there is.

Next, as shown in FIG. 2B, a masking tape 20 is attached to a part of the surface of the insulating film 12.

This masking tape 20 is attached in a direction that prevents the conductive film 13 to be attached in the next step from flowing a short circuit current due to an induced voltage caused by electromagnetic induction, that is, in a direction perpendicular to the winding direction of the coil 11. The position where this masking tape 20 is pasted corresponds to the gap 14.

Note that forming the gap 14 is not limited to pasting the masking tape 20; for example, a solvent that repels metal plating material, conductive paint, etc. may be applied.

Then, as shown in FIG. 3C, the coil 11 masked in this manner is coated with the liquid conductive material on its surface to form a conductive film 13.

This conductive film 13 is applied to the coil 1 after the masking process has been completed.
1 is immersed in a conductive film such as a metal plating solvent or a conductive paint, and then taken out, the conductive material is cured to form on the surface of the insulating film 12.

That is, the conductive film 13 can be formed by a relatively simple operation of just immersing the coil 11 in the conductive layer H.

Then, as shown in FIG. 2D, the masking tape 20 is peeled off to form a gap 14 in which the insulating film 12 is exposed.

Next, as shown in FIG. 2E, the insulating tape 15 is attached to the surface of the coil 11 so as to cover one end of the conductive film 13 separated by the gap 14.

Furthermore, as shown in FIG.
Paste it over the .

This conductive tape 16 is connected to one end of the conductive film 13 and is pasted with the insulating tape 15 so as not to contact both ζ:1 portions.

Note that the insulating tape 15 may be attached across both ends of the conductive film 13, and one end of the conductive tape 16 may be kept from contacting the conductive film 13.

Therefore, the conductive tape 16 can cover the gap 14 without causing a short circuit to the conductive film 13 with the insulating tape 15, as shown in FIG.

Furthermore, as shown in FIG. 2H, an insulating material is again applied to the surface of the coil 11 which has been electrostatically shielded by the conductive film 13 and the conductive tape 16, and the insulating film 12 is formed to conduct the coil 11. Perfect insulation between the membrane 13 and the conductive tape 16 and the outside.

At this time, the insulating film 12 does not need to have a flat surface because it is only necessary to insulate it from the outside.

The electrostatic shielding coil 10 manufactured in this way is
As in the conventional case, an electrostatic shield transformer is assembled by inserting an iron core (not shown) formed in advance according to the application.

Therefore, the conductive film 13 can be formed by a relatively simple operation of just immersing the coil 11 in a conductive material, and the coil 11 can be effectively electrostatically shielded by the conductive film 13 and the conductive tape 16. Since this work can be easily automated, the electrostatic shielding transformer can be manufactured easily.

Next, the manner in which a so-called toroidal coil is electrostatically shielded by the method of manufacturing an electrostatically shielded transformer according to the present invention will be explained based on FIG.

First, the toroidal coil 30 is formed by winding a conductive wire around an annular core made of a material with high magnetic permeability or an annular jig.

Then, the insulating material is resin-molded and adhered to the surface of this toroidal coil 30, and as shown in FIG.
form 0.

Next, as shown in FIG. 2B, a masking tape 20 is applied to the surface of the insulating film 12 in a direction perpendicular to the winding direction of the coil 11 to form a gap 14.

And toroidal coil 3 with this masking
0 is immersed in a metal plating solvent and a conductive material, and after being taken out, the conductive material is cured to form a conductive film 13, as shown in FIG.

Furthermore, as shown in FIG. 2D, the masking tape 20 is peeled off to form a gap 14 in which the insulating film 12 is exposed.

Next, as shown in FIG. 2E, the insulating tape 15 is attached to the surface of the coil 11 so as to cover at least one end of the conductive film 13 separated by the gap 14.

Further, as shown in FIG. 2F, the conductive tape 16 is pasted over the insulating tape 15 so as to cover the gap 14 and not to contact both ends of the conductive film 13.

Therefore, the conductive tape 16 can cover the gap 14 without short-circuiting the conductive film 13 with the insulating tape 15, as shown in FIG.

Furthermore, as shown in FIG. 1H, an insulating material is again attached to the surface of the coil 11 which has been electrostatically shielded by the conductive film 13 and the conductive tape 16, and the insulating film 12 is formed, thereby forming a conductive film. 13 and the conductive tape 16 and the outside are completely insulated.

In this way, even in the toroidal coil 30, the conductive film 13 and the conductive tape 16 can be coated reliably and easily, and electrostatic shielding can be reliably achieved.

(Effect of the invention) As is clear from the above explanation, the present invention has the following features:
It has the following effects.

The coil is in liquid form during coating, and after coating, the coil can be electrostatically shielded by simply attaching a shielding material that forms a conductive film to the coil and pasting conductive tape through insulating tape. , such work can be easily automated, improving productivity and
Product uniformity can be achieved.

In addition, since the coil can be reliably shielded from the outside with these shielding parts and conductive tape, it is possible to reliably remove high frequency noise, etc., and we can manufacture coils with high electrostatic shielding effects. can do.

[Brief explanation of the drawing]

FIG. 1 is an external view of an electrostatic shielding coil 10 manufactured by the method for manufacturing an electrostatic shielding transformer according to the present invention, FIG. 2 is a sectional view taken along line AA in FIG. 1, and FIG. FIG. 4 is an explanatory diagram of the manufacturing process of the electrostatic shield transformer according to the present invention.
Figure 5 showing the process of electrostatic shielding a toroidal coil by the method of manufacturing an electrostatic shield transformer according to the present invention.
6 are explanatory diagrams of a conventional electrostatic shield transformer. 10... Electrostatic shielding coil, 11... Coil, 1
2... Insulating film (insulating member), 13... Conductive film (shielding member), 14... Gap, 15... Insulating tape, 16
... Conductive tape patent applicant Akzo Comma Co., Ltd. agent Patent attorney 8 1) Mikio (other names) Figure 1 Figure 2 Figure 4 Figure 5 Figure 6150

Claims (1)

[Claims] The surface of a coil that generates a magnetic field is coated with an insulating member that electrically insulates the coil from the outside, and then the magnetic field passes through and shields the electric field generated incidentally to the magnetic field. A liquid shielding member that forms a conductive film on the surface of the insulating member after coating is placed outside the insulating member with a gap provided so that a short circuit current due to an induced voltage generated by electromagnetic induction does not flow. coated with
Thereafter, at least one end of the shielding member separated by the gap is covered with an insulating tape having insulation properties, and further thereafter, the gap is covered with a conductive tape having conductivity through the insulating tape. An electrostatic shield, characterized in that at least one set of layers consisting of the insulating member and the shielding member is formed on the outside of the coil, and the coil is electrostatically shielded by the shielding member in an easy to manufacture manner. Method of manufacturing transformers.