JP2014204002A - Resin mold coil, manufacturing method therefor and mold transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin mold coil in which occurrence of partial discharge is suppressed sufficiently around a coil conductor by enhancing the impregnation properties of a thermosetting resin, and to provide a manufacturing method therefor and a mold transformer.SOLUTION: When manufacturing a resin mold coil having a cylindrical core 2, a coil conductor 3 wound on the outer periphery of the core 2 in multilayer, and an insulating sheet 4 for insulating between the layers of the coil conductor 3, a linear object 11 thinner than the coil conductor 3 is wound spirally on the outer periphery of the coil conductor 3 at a pitch of not bringing the linear objects into contact with each other. Thereafter, the coil conductor 3 is wound on the outer periphery of the core 2, and after interposing the insulating sheet 4 between the inner peripheral side conductor and the outer peripheral side conductor of the coil conductor 3, the circumference of the coil conductor 3 is molded of a thermosetting resin 5.

Description

  The present invention relates to a resin molded coil used for a molded transformer, an instrument transformer, an instrument transformer (PT), an instrument transformer (PC), a manufacturing method thereof, and a mold transformer.

  In a molded transformer that transforms an alternating voltage, a resin molded coil having a structure shown in FIG. 8, for example, is used as a coil mounted on an iron core. This resin-molded coil includes a core portion 2 in which a protective film is formed in a cylindrical shape, a coil conductor 3 wound in multiple layers around the outer periphery of the core portion 2, and a plurality of insulating sheets 4 that insulate between the layers of the coil conductor 3. And the periphery of the coil conductor 3 is covered and molded with a thermosetting resin 5 such as an epoxy resin.

When manufacturing such a resin mold coil, as shown in FIG. 9, first, a core film 2 is formed by winding a protective film in a cylindrical shape on the outer peripheral surface of an inner mold 6 formed in a columnar shape. . Next, the coil conductor 3 is wound in multiple layers around the outer periphery of the core portion 2, and the insulating sheet 4 is interposed between the inner peripheral conductor and the outer peripheral conductor of the coil conductor 3.
Thereafter, the inner mold 6 is set inside the outer mold 7, and the uncured thermosetting resin 5 is injected into the outer mold 7 from the resin injection port 8 formed in the outer mold 7. At this time, the thermosetting resin 5 injected inside the outer mold 7 flows into the gap 9 formed by the core portion 2 and the coil conductor 3 and the gap 10 formed by the coil conductor 3 and the insulating sheet 4. The periphery of the coil conductor 3 is molded.

  The coil conductor 3 of the resin mold coil manufactured by such a method is usually wound around the outer periphery of the core part 2 by the winding method shown in FIG. For this reason, there is a potential difference corresponding to the number of turns of two layers between the folded portions (between the layers). In order to insulate this potential difference, the coil conductor 3 is provided between the inner peripheral conductor and the outer peripheral conductor. An insulating sheet 4 is interposed.

  The coil conductor 3 generally has a circular cross section in order to secure a conduction area. Therefore, when the coil conductor 3 is wound around the outer periphery of the cylindrical core portion 2 and the insulating sheet 4 is interposed between the inner peripheral conductor and the outer peripheral conductor of the coil conductor 3, the corners of the gaps 9 and 10 described above are obtained. The part has a wedge shape. For this reason, it becomes difficult to impregnate the cast thermosetting resin 5 to the corners of the gaps 9 and 10, and if the non-impregnated portions of the thermosetting resin 5 remain in the corners of the gaps 9 and 10, the gaps 9 and 10. There is a problem that partial discharge occurs at the corners of the metal and erodes the insulating material between the layers, causing the deterioration of insulation.

  As a method of suppressing the occurrence of partial discharge, a method of winding the coil conductor 3 around the outer periphery of the core portion 2 by the winding method shown in FIG. 11 or FIG. 12, and suppressing the interlayer potential difference of the coil conductor 3 below the Paschen voltage, A foil-shaped coil conductor is used, and this is wound around the outer periphery of the core portion 2 by the winding method shown in FIG. 13 so that no potential difference is generated between the layers of the coil conductor 3, and the rectangular coil conductor 3 as shown in FIG. There is a method of manufacturing a resin-molded coil by wrapping around the outer periphery of the portion 2.

The method shown in FIGS. 11 to 13 eliminates the need for an insulating sheet that insulates the layers of the coil conductors, and can suppress the occurrence of partial discharge between the coil conductors. A winding jig is required, and there is a problem that the winding process takes longer than the normal winding method shown in FIG.
Further, the method shown in FIG. 14 also requires a dedicated winding machine, and there is a problem that the winding process takes time. Further, the coil conductor having a square cross section has a problem that the conductive area is smaller than that of the coil conductor having a circular cross section.
As a technique for improving the impregnation property of the thermosetting resin, a linear insulator formed by twisting a plurality of glass fibers is interposed between the superconducting wires of the superconducting coil, and the thermosetting resin is impregnated between the superconducting wires. The technique is described in Patent Document 1.

JP-A-6-251935

However, if the technique described in Patent Document 1 is applied to a method of manufacturing a resin molded coil, there is a problem that it is difficult to insulate the layers of the coil conductor wound around the outer periphery of the core portion with an insulating sheet. is there. As long as the gap formed by the core and the coil conductor or the corner of the gap formed by the coil conductor and the insulating sheet has a wedge shape, a linear insulator formed by twisting a plurality of glass fibers is used as a gap. It is difficult to impregnate the thermosetting resin up to the corners of the gap even if it is interposed in the gap.
The present invention has been made in view of the above-described problems, and a resin molded coil in which the occurrence of partial discharge around the coil conductor is sufficiently suppressed by improving the impregnation property of the thermosetting resin, and its An object is to provide a manufacturing method and a molded transformer.

  In order to solve the above problems, the invention of claim 1 includes a cylindrical core portion, a coil conductor wound in multiple layers on the outer periphery of the core portion, and an insulating sheet that insulates the layers of the coil conductor. A method of manufacturing a resin-molded coil in which a periphery of the coil conductor is molded with a thermosetting resin, and a linear body having a diameter smaller than that of the coil conductor is brought into contact with an outer periphery of the coil conductor. Winding in a spiral shape with a pitch that does not fit, and then winding the coil conductor around the outer periphery of the core, and after interposing the insulating sheet between the inner and outer conductors of the coil conductor, The periphery of the coil conductor is molded with the thermosetting resin.

The invention according to claim 2 is characterized in that the linear body is made of a heat-resistant insulating material.
The invention according to claim 3 is characterized in that a linear body made of the heat-resistant insulating material has a diameter of the linear body of 1/3 or less of the diameter of the coil conductor.
The invention of claim 4 is characterized in that a linear metal conductor provided with an insulating coating is used as the linear body.
The invention of claim 5 is characterized in that the linear body has a diameter of 100 μm or more.
The invention of claim 6 is characterized in that the linear body is wound in a spiral shape around the outer periphery of the coil conductor at a pitch of 60 times or less the diameter of the coil conductor.

According to the seventh aspect of the present invention, a thermosetting resin is cast in a winding in which a coil conductor is wound in multiple layers on the outer periphery of a cylindrical core portion and an insulating sheet is interposed between layers of the coil conductor. A linear molded body having a diameter smaller than that of the coil conductor is spirally wound around the outer periphery of the coil conductor at a pitch at which the linear bodies do not contact each other.
The invention according to claim 8 is characterized in that the linear body is made of a heat-resistant insulating material.
The invention of claim 9 is characterized in that the diameter of the linear body made of the heat-resistant insulating material is 1/3 or less of the diameter of the conductor.

The invention according to claim 10 is characterized in that the linear body is obtained by applying an insulating coating to a linear metal conductor.
The invention of claim 11 is characterized in that a diameter of the linear body is 100 μm or more.
According to a twelfth aspect of the present invention, the linear body is spirally wound around the outer periphery of the coil conductor at a pitch of 60 times or less the diameter of the coil conductor.
A thirteenth aspect of the present invention is a molded transformer comprising the resin molded coil according to any one of the seventh to twelfth aspects and an iron core inserted through the core portion.

  According to the first aspect of the present invention, the core portion and the coil are formed by winding a linear body having a diameter smaller than that of the coil conductor in a spiral shape at a pitch at which the linear bodies do not contact each other on the outer periphery of the coil conductor. The corners of the gap formed by the conductor and the coil conductor and the insulating sheet do not have a wedge shape, and the thermosetting resin is easily impregnated to the corner of the gap. The resin impregnation property can be improved, whereby a resin molded coil in which the occurrence of partial discharge around the coil conductor is sufficiently suppressed can be manufactured.

According to the second aspect of the present invention, when the linear body is made of a heat-resistant insulating material, the linear body thermally expands in the radial direction to increase the temperature, whereby the thermosetting resin becomes a coil conductor. It can suppress peeling from.
According to the invention of claim 3, by using the linear body made of the heat-resistant insulating material having a diameter of the linear body of 1/3 or less of the diameter of the coil conductor, a wire is formed on the outer periphery of the coil conductor. The impregnation property of the thermosetting resin can be improved without greatly reducing the conductive area of the coil conductor as compared with the configuration in which the shape body is not wound.

  According to the invention of claim 4, by using a linear metal conductor having an insulating coating as the linear body, it is possible to pass a current through the linear body in addition to the coil conductor. Compared with a configuration in which a linear body made of a heat-resistant insulating material is wound around the outer periphery of the conductor, the current conduction cross-sectional area is increased by the cross-sectional area of the metal conductor portion of the linear body, and the impregnation property of the thermosetting resin Improvements can be made.

According to the invention of claim 5, by using the linear body having a diameter of 100 μm or more, the linear body is embedded in the insulating sheet and fills the gap formed by the insulating sheet and the coil conductor. Can be suppressed.
According to the invention of claim 6, the wire is wound around the outer periphery of the coil conductor by spirally winding the linear body around the outer periphery of the coil conductor at a pitch of 60 times or less the diameter of the coil conductor. It can suppress that the impregnation property of a thermosetting resin is impaired by a coil conductor contacting a core part and an insulation sheet between linear bodies.

  According to the invention of claim 7, the linear body having a diameter smaller than that of the coil conductor is wound spirally at a pitch at which the linear bodies do not come into contact with each other on the outer periphery of the coil conductor. The gap formed by the coil conductor and the corner of the gap formed by the coil conductor and the insulating sheet do not have a wedge shape, and the cast thermosetting resin can be easily impregnated to the corner of the gap. Therefore, it is possible to improve the impregnation property of the thermosetting resin, thereby realizing a resin mold coil in which the occurrence of partial discharge around the coil conductor is sufficiently suppressed.

According to invention of Claim 8, when the said linear body consists of a heat resistant insulating material, a thermosetting resin peels from a coil conductor when a linear body thermally expands to radial direction for a temperature rise. This can be suppressed.
According to the ninth aspect of the present invention, the diameter of the linear body made of the heat-resistant insulating material is 1/3 or less of the diameter of the conductor, so that the linear body is not wound around the outer periphery of the coil conductor. Thus, the impregnation of the thermosetting resin can be improved without greatly reducing the conductive area of the coil conductor.

According to the invention of claim 10, since the linear body is obtained by applying an insulating coating to the linear metal conductor, it is possible to pass a current through the linear body in addition to the coil conductor. Compared with a configuration in which a linear body made of a heat-resistant insulating material is wound around the outer periphery of the wire, the conduction cross-sectional area of the current is increased by the cross-sectional area of the metal conductor portion of the linear body, and the impregnation of the thermosetting resin is improved. Can be achieved.
According to the invention of claim 11, when the diameter of the linear body is 100 μm or more, the linear body is prevented from being embedded in the insulating sheet and filling a gap formed by the insulating sheet and the coil conductor. can do.

According to the invention of claim 12, the linear body is wound around the outer periphery of the coil conductor at a pitch of 60 times or less the diameter of the coil conductor, thereby being wound around the outer periphery of the coil conductor. It can suppress that the impregnation property of a thermosetting resin is impaired by a coil conductor contacting a core part or an insulating sheet between the linear bodies.
According to the invention of claim 13, by providing the resin mold coil according to any one of claims 7 to 12, a molded transformer in which occurrence of partial discharge around the coil conductor is sufficiently suppressed. Can be realized.

It is a figure which shows the axial direction cross section of the resin mold coil which concerns on one Embodiment of this invention. It is a figure which shows the state which wound the linear body around the coil conductor of the resin mold coil in spiral shape. A state in which a coil conductor, in which a linear body is wound in a spiral shape, is wound in multiple layers around the outer periphery of a cylindrical core and an insulating sheet is interposed between the inner and outer conductors of the coil conductor. FIG. It is a figure which shows the state which set the inner metal mold | die used at the time of manufacture of a resin mold coil to the outer metal mold | die. It is a figure which shows the shape of the space | gap formed with the protective film of a resin mold coil, and a coil conductor by one Embodiment of this invention. It is a figure which shows the shape of the space | gap formed with the coil conductor and resin sheet of a resin mold coil by one Embodiment of this invention. It is a partial fracture front view showing the example of composition of the mold transformer concerning one embodiment of the present invention. It is a figure which shows the axial direction cross section of the conventional resin mold coil. It is a figure for demonstrating the conventional manufacturing method of a resin mold coil. It is a figure which shows how to wind the coil conductor wound by the outer periphery of a core part at the time of manufacture of a resin mold coil. It is a figure which shows an example of the winding method of the coil conductor for suppressing the interlayer electric potential difference of a coil conductor below to a Paschen voltage. It is a figure which shows the other example of the winding method of the coil conductor for suppressing the interlayer electric potential difference of a coil conductor below to a Paschen voltage. It is a figure which shows how to wind a coil conductor at the time of using a foil-like conductor as a coil conductor of a resin mold coil. It is a figure which shows how to wind a coil conductor at the time of using a square conductor as a coil conductor of a resin mold coil.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows an axial cross section of a resin molded coil according to an embodiment of the present invention. As shown in FIG. 1, a resin molded coil 1 according to an embodiment of the present invention is wound in multiple layers around a core portion 2 in which an insulating protective film is formed in a cylindrical shape and the outer periphery of the core portion 2. A coil conductor 3 such as enameled wire and a plurality of insulating sheets 4 that insulate between the layers of the coil conductor 3, and the periphery of the coil conductor 3 is molded with a thermosetting resin 5 such as an epoxy resin cast. It has a structure.

The coil conductor 3 is a conductor coated with an insulator, and examples of the material for the resin coating of the enamel wire applied to the coil conductor 3 include polyurethane and polyester, but are not limited thereto. . Moreover, as a metal material which forms the coil conductor 3, aluminum, copper, etc. are used, for example.
Examples of the protective film forming the core 2 include those made of an insulating material such as PET (polyethylene terephthalate), PEN (polyethylene naphthalate), which is an inexpensive polyethylene resin material, and glass fiber mat, which is a heat-resistant material. Although used, it is not limited to this. The insulating sheet 4 is made of an insulating material such as an aramid (fully aromatic polyamide) polymer, PET (polyethylene terephthalate), PEN (polyethylene naphthalate), but is not limited thereto.

The resin molded coil 1 has a linear body 11 having a diameter smaller than that of the coil conductor 3. The linear body 11 is made of a heat-resistant insulating material such as polypropylene or Teflon (registered trademark), and is wound around the outer periphery of the coil conductor 3 in a spiral shape at a pitch at which the linear bodies 11 do not contact each other.
In addition, the linear body 11 is not limited to what consists of the above-mentioned heat resistant insulating material, As what is mentioned later, what provided the insulation coating to the linear metal conductor can also be used.

  As described above, the resin molded coil 1 according to an embodiment of the present invention includes the coil conductor 3 wound in multiple layers on the outer periphery of the core portion 2 in which an insulating protective film is formed in a cylindrical shape, and the coil conductor. 3 is a resin-molded coil in which a thermosetting resin 5 is cast in a winding in which an insulating sheet 4 is interposed between three layers, and a linear body 11 having a diameter smaller than that of the coil conductor 3 is the outer periphery of the coil conductor 3 The linear bodies 11 are wound in a spiral shape at a pitch at which the linear bodies 11 do not contact each other.

  For this reason, in the resin mold coil 1, the gap formed by the core portion 2 and the coil conductor 3 and the corner portion of the gap formed by the coil conductor 3 and the insulating sheet 4 were cast without being wedge-shaped. Since the thermosetting resin 5 is easily impregnated to the corners of the gap and the impregnation property of the thermosetting resin 5 around the coil conductor 3 is improved, the thermosetting resin 5 is not impregnated. Since the remaining part is sufficiently suppressed, the occurrence of partial discharge around the coil conductor 3 can be sufficiently suppressed.

Next, the manufacturing method of the resin mold coil 1 which concerns on one Embodiment of this invention is demonstrated. 2-4 is a figure which shows the procedure for manufacturing the resin mold coil 1. FIG. When manufacturing the resin mold coil 1 described above, as shown in FIG. 2, first, the linear body 11 having a diameter smaller than that of the coil conductor 3 is formed at a pitch P at which the linear bodies do not contact each other. Wrap in a spiral around the periphery.
Here, when the diameter of the linear body 11 is less than 100 μm, the linear body 11 wound around the outer periphery of the coil conductor 3 may be buried in the insulating film or the insulating sheet 4 of the coil conductor 3. Therefore, the diameter of the linear body 11 is preferably 100 μm or more.

  Further, when the linear body 11 is made of a heat-resistant insulating material, if the diameter of the linear body 11 is larger than 1/3 of the diameter of the coil conductor 3, the overall dimensions of the resin molded coil 1 are the same under the same conditions. Compared with a configuration in which the linear body 11 is not wound around the outer periphery of the conductor 3, the conductive area of the coil conductor 3 is greatly reduced. For this reason, in order to ensure the conduction area of the coil conductor 3, it is desirable that the diameter of the linear body 11 is 1/3 or less of the diameter of the coil conductor 3.

When the winding pitch P of the linear body 11 is larger than 60 times the diameter of the coil conductor 3, the insulating sheet 4 contacts the surface of the coil conductor 3 between the adjacent linear bodies 11, and the thermosetting resin Therefore, the winding pitch P of the linear body 11 is preferably 60 times or less the diameter of the coil conductor 3.
If the linear body 11 is wound around the outer periphery of the coil conductor 3, then, as shown in FIG. 3, the outer periphery of the core 2 formed by winding a protective film around the outer peripheral surface of the inner mold 6 in a cylindrical shape. The coil conductor 3 is wound in multiple layers by the normal winding method shown in FIG. 9, and the insulating sheet 4 is interposed between the inner and outer conductors of the coil conductor 3 to insulate the layers of the coil conductor 3 from each other. To do.

  Thereafter, as shown in FIG. 4, for casting the thermosetting resin 5, the inner mold 6 is set inside the outer mold 7, and the resin is injected from the resin inlet 8 formed in the outer mold 7. An uncured thermosetting resin 5 is injected inside the mold 7. At this time, the thermosetting resin 5 injected into the inner side of the outer mold 7 is formed in the gap 9 formed by the core portion 2 and the coil conductor 3 and the gap 10 formed by the coil conductor 3 and the insulating sheet 4. It flows in and flows in the circumferential direction and the axial direction of the inner mold 6 to mold the periphery of the coil conductor 3.

  As described above, the linear body 11 having a diameter smaller than that of the coil conductor 3 is spirally wound around the outer periphery of the coil conductor 3 at a pitch at which the linear bodies do not come into contact with each other, and then the protective film is wound in a cylindrical shape. When the coil conductor 3 is wound in multiple layers around the outer periphery of the core part 2 and the insulating sheet 4 is interposed between the inner peripheral conductor and the outer peripheral conductor of the coil conductor 3, the core part 2 and the coil conductor 3 are 5 is formed at the time of manufacturing the resin molded coil, and the coil conductor 3 and the insulating sheet 4 form the void 10 having the shape as shown in FIG. 6 at the time of manufacturing the resin molded coil. Thereby, since the corners of the gaps 9 and 10 do not have a wedge shape, it is possible to improve the impregnation property of the thermosetting resin cast when the resin mold coil is manufactured.

Further, since the cast thermosetting resin 5 can be impregnated to the corners of the gaps 9 and 10, the remaining of the non-impregnated portion of the thermosetting resin 5 is sufficiently suppressed, so that In the resin molded coil 1 manufactured by the manufacturing method described with reference to FIGS. 2 to 6, it is possible to sufficiently suppress the occurrence of partial discharge around the coil conductor 3.
Further, since the linear body 11 is made of a heat-resistant insulating material such as polypropylene, the linear body 11 thermally expands in the radial direction due to a temperature rise, so that the thermosetting resin 5 becomes the coil conductor 3. It can suppress peeling from.

In addition, by setting the diameter of the linear body 11 to 100 μm or more, it is possible to prevent the linear body 11 from being embedded in the insulating sheet 4 and filling the gap formed by the insulating sheet 4 and the coil conductor 3. it can.
Further, by setting the winding pitch P of the linear body 11 to 60 times or less of the diameter of the coil conductor 3, the insulating sheet 4 comes into contact with the surface of the coil conductor 3 between the adjacent linear bodies 11, and thermosetting is performed. That the impregnation property of the conductive resin 5 is impaired can be suppressed.

  In the above-described embodiment of the present invention, the linear body wound around the outer periphery of the coil conductor is made of a heat-resistant insulating material, but the linear metal conductor is coated with an insulating coating. It may be used. As the material of the linear metal conductor, for example, aluminum or copper can be used. Unlike the case of using a heat-resistant insulating material by using an insulating coating on a linear metal conductor as a linear body, current flows through the linear body in addition to the coil conductor. Compared to a configuration in which a linear body made of a heat-resistant insulating material is wound around the outer periphery of the coil conductor, the current conduction cross-sectional area is increased by the cross-sectional integral of the metal conductor portion of the linear body, and thermosetting is performed. The impregnation property of the conductive resin can be improved.

Here, for example, an enameled wire can be used as a linear body wound around the outer periphery of the coil conductor, but the present invention is not limited thereto. .
This resin mold coil 1 can be suitably used for electrical devices such as a mold transformer, an instrument transformer, and an instrument current transformer. In particular, it is suitable for a high voltage device having a primary coil side voltage of 3.3 kV or higher. For example, if a primary coil and a secondary coil are constituted by the resin mold coil 1 of the present embodiment and an iron core is inserted through the core portion 2 of each coil, a molded transformer having excellent long-term reliability can be obtained.

FIG. 7 is a partially fragmented front view showing a configuration example of a molded transformer according to an embodiment of the present invention. The crushing part on the right side of FIG. 7 is a cross-sectional view. As shown in FIG. 7, in a molded transformer 21 according to an embodiment of the present invention, reference numeral 22 denotes an iron core formed by laminating steel plates, and the iron core 22 is resin-molded with a high-voltage winding 23A and a low-voltage winding. 23B are wound coaxially with each other. The high voltage winding 23 </ b> A and the low voltage winding 23 </ b> B are sandwiched between the upper frame 25 and the lower frame 26 via an insulating coil receiver 24. The windings 23 composed of the high-voltage windings 23A and the low-voltage windings 23B are arranged side by side for three phases. An insulating spacer 27 is interposed between the high-voltage winding 23A and the low-voltage winding 23B, and an insulating gap member 28 is interposed between the low-voltage winding 23B and the main leg of the iron core 22. It is disguised.
Of the high-voltage winding 23A and the low-voltage winding 23B in such a molded transformer 21, a partial discharge is generated around the coil conductor, particularly by using the resin mold coil 1 of the present embodiment as the high-voltage winding 23A. Can be realized.

  An enameled wire having a diameter of 1.0 mm was used as a coil conductor, and two sheets of NOMEX (registered trademark) manufactured by DuPont, product number 410 (thickness: 180 μm) were used as insulating sheets. And the resin mold coil was produced using the enamel wire of diameter 0.2mm as a linear body, and the partial discharge extinction voltage of the coil conductor was measured. As a result, the partial discharge extinction voltage is 1.4 kVrms when the coil conductor is a single enameled wire, and the partial discharge extinction voltage is 5.2 kVrms when a linear body is spirally wound around the outer periphery of the coil conductor. The partial discharge characteristics were improved by about 3.7 times compared to the above. In addition, when the spirally wound linear body was wound around the outer periphery of the coil conductor, the gap formed by the core portion and the coil conductor and the gap formed by the coil conductor and the insulating sheet were observed. It was confirmed that the thermosetting resin was impregnated up to the corners.

DESCRIPTION OF SYMBOLS 1 ... Resin mold coil 2 ... Core part 3 ... Coil conductor 4 ... Insulation sheet 5 ... Thermosetting resin 6 ... Inner metal mold 7 ... Outer metal mold 8 ... Resin injection port 9, 10 ... Air gap 11 ... Linear body 21 ... Molded transformer

Claims (13)

A cylindrical core, a coil conductor wound in multiple layers on the outer periphery of the core, and an insulating sheet that insulates between the layers of the coil conductor, and the periphery of the coil conductor is molded with a thermosetting resin. A method for producing a resin molded coil,
A linear body having a diameter smaller than that of the coil conductor is spirally wound around the outer periphery of the coil conductor at a pitch at which the linear bodies do not contact each other, and then the coil conductor is wound around the outer periphery of the core portion. A method for producing a resin-molded coil, comprising: interposing the insulating sheet between an inner circumferential conductor and an outer circumferential conductor, and then molding the periphery of the coil conductor with the thermosetting resin.   The method for producing a resin-molded coil according to claim 1, wherein the linear body is made of a heat-resistant insulating material.   The method for producing a resin-molded coil according to claim 2, wherein the linear body made of the heat-resistant insulating material has a diameter of the linear body of 1/3 or less of the diameter of the coil conductor.   The method for producing a resin-molded coil according to claim 1, wherein a linear metal conductor provided with an insulating coating is used as the linear body.   The method for producing a resin-molded coil according to any one of claims 1 to 4, wherein the linear body has a diameter of 100 µm or more.   The resin-molded coil manufacturing method according to any one of claims 1 to 5, wherein the linear body is wound in a spiral shape around an outer periphery of the coil conductor at a pitch of 60 times or less the diameter of the coil conductor. Method. A coil-molded coil in which a coil conductor is wound in multiple layers on the outer periphery of a cylindrical core and a thermosetting resin is cast in a winding in which an insulating sheet is interposed between the layers of the coil conductor. ,
A resin-molded coil, wherein a linear body having a diameter smaller than that of the coil conductor is spirally wound around the outer periphery of the coil conductor at a pitch at which the linear bodies do not contact each other.   The resin-molded coil according to claim 7, wherein the linear body is made of a heat-resistant insulating material.   9. The resin molded coil according to claim 8, wherein a diameter of the linear body made of the heat resistant insulating material is 1/3 or less of a diameter of the coil conductor.   8. The resin molded coil according to claim 7, wherein the linear body is a linear metal conductor provided with an insulating coating.   The diameter of the said linear body is 100 micrometers or more, The resin mold coil as described in any one of Claims 7-10 characterized by the above-mentioned.   The resin mold according to any one of claims 7 to 11, wherein the linear body is spirally wound around the outer periphery of the coil conductor at a pitch of 60 times or less the diameter of the coil conductor. coil.   A molded transformer comprising the resin molded coil according to any one of claims 7 to 12 and an iron core inserted through the core portion.

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