JP2023014683A - Wire wound device and manufacturing method of wire wound device - Google Patents

Abstract

To provide: a wire wound device which allows improvement in cooling performance; and a manufacturing method of the wire wound device.SOLUTION: A transformer (1) comprises: windings (3a, 3b); cooling jackets (4, 5) for cooling the windings (3a, 3b); high heat conductive resin (6) provided on the windings (3a, 3b) sides of the cooling jackets (4, 5); and sealing resin or varnish for sealing the windings (3a, 3b), the cooling jackets (4, 5), and the high heat conductive resin (6). The high heat conductive resin (6) has heat conductivity higher than that of the sealing resin or the varnish.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to a wound device and a method of manufacturing a wound device.

Winding devices such as transformers and reactors are required to efficiently cool Joule heat generated when current flows through the windings. In particular, in a high-frequency winding device used as a power electronic device, high-frequency current is supplied to the windings at a high output, so the loss density in the windings is high. Therefore, in such a high-frequency wire-wound device, there is a demand for efficient cooling of the high-frequency wire-wound device by efficiently dissipating the loss, that is, the heat generated in the high-potential portion to the outside.

A conventional winding device has a core that has a linear axis and is inserted into the wound coil, and a case that has a heat radiation fin portion and a gap formed in a shape along the outer circumference of the coil. , a core and a coil are inserted into a gap, and a case is filled with, for example, an epoxy resin (see Patent Document 1 below).

Patent No. 3814288

However, in the conventional wire-wound device as described above, the distance between the coil (winding) and the case (connected to the heat dissipation fins) is large, so the heat generated by the coil is efficiently dissipated. There is a limit to what can be done, and this sometimes causes a problem that it is difficult to improve the cooling performance of the wire-wound equipment.

The present disclosure has been made in view of the above problems, and an object thereof is to provide a wire-wound device capable of improving cooling performance, and a method of manufacturing the wire-wound device.

In order to solve the above problems, a winding device according to one aspect of the present disclosure includes a winding, a cooling jacket that cools the winding, and the cooling jacket that is integrally provided on the winding side A high thermal conductive resin and a sealing resin that seals the windings, the cooling jacket, and the high thermal conductive resin are provided, and the high thermal conductive resin has a higher thermal conductivity than the sealing resin.

Further, a method for manufacturing a wire wound device according to one aspect of the present disclosure is a method for manufacturing a wire wound device including a winding and a cooling jacket for cooling the winding, wherein the winding side of the cooling jacket is and forming a sealing resin that seals the winding, the cooling jacket, and the high thermal conductive resin, wherein the high thermal conductive resin is the sealing It has a higher thermal conductivity than the sealing resin.

According to one aspect of the present disclosure, it is possible to provide a wire wound device capable of improving cooling performance and a method for manufacturing the wire wound device.

It is a figure explaining the principal part composition of the transformer concerning Embodiment 1 of this indication. 2 is a diagram showing the appearance of an outer winding unit including the outer windings shown in FIG. 1; FIG. 3 is a diagram showing the internal configuration of the outer winding unit shown in FIG. 2; FIG. FIG. 2 is a diagram showing the appearance of an inner winding unit including the inner windings shown in FIG. 1; 5 is a diagram showing the internal configuration of the inner winding unit shown in FIG. 4; FIG. It is a figure explaining the principal part structure of the said outer winding unit. FIG. 7 is a front view showing the high thermal conductive resin shown in FIG. 6; 8 is a cross-sectional view taken along line VIII-VIII of FIG. 7; FIG. FIG. 8 is a cross-sectional view taken along line IX-IX of FIG. 7; 4 is a flow chart showing a method for manufacturing a transformer according to Embodiment 1 of the present disclosure; It is a figure explaining the manufacturing process of the said outer winding unit. It is a figure explaining the manufacturing process of the said inside coil|winding unit. FIG. 5 is a diagram illustrating a main configuration of a transformer according to Embodiment 2 of the present disclosure; FIG. 5 is a diagram illustrating a main configuration of a transformer according to Modification 1 of the present disclosure; FIG. 10 is a diagram illustrating a main configuration of a transformer according to Modification 2 of the present disclosure; FIG. 11 is a diagram illustrating a main configuration of a transformer according to Modification 3 of the present disclosure;

[Embodiment 1]
Embodiment 1 of the present disclosure will be described in detail below with reference to FIGS. 1 to 5. FIG. FIG. 1 is a diagram illustrating the main configuration of a transformer 1 according to Embodiment 1 of the present disclosure. FIG. 2 is a diagram showing the appearance of the outer winding unit 30 including the outer winding 3a shown in FIG. FIG. 3 is a diagram showing the internal configuration of the outer winding unit 30 shown in FIG. 2. As shown in FIG. FIG. 4 is a diagram showing the appearance of an inner winding unit 40 including the inner winding 3b shown in FIG. FIG. 5 is a diagram showing the internal configuration of the inner winding unit 40 shown in FIG.

In the following description, a case where the present invention is applied to a transformer having an outer winding and an inner winding will be exemplified as a winding device. However, the winding device of the present disclosure is not limited at all as long as it has a winding, a cooling jacket, a high thermal conductive resin, and a sealing resin. can also be applied to other winding devices.

<Transformer 1>
As shown in FIG. 1, a transformer 1 of this embodiment includes an iron core 2 and windings 3 wound around the left and right legs of the iron core 2 . The winding 3 has, for example, an outer winding 3a and an inner winding 3b. The transformer 1 includes a cooling jacket 4 that cools the outer winding 3a, a cooling jacket 5 that cools the inner winding 3b, and a It has a high thermal conductivity resin 6 provided. The transformer 1 is a so-called molded transformer in which the outer winding 3a and the inner winding 3b are individually sealed with sealing resin, which will be described later. However, in FIG. 1, illustration of each sealing resin is omitted for simplification of the drawing.

The iron core 2 is made of, for example, a ferromagnetic material such as silicon steel plate, ferrite, amorphous alloy, or nanocrystalline soft magnetic material. The iron core 2 can be divided into, for example, two U-shaped members, an outer winding unit 30 (FIG. 2) including the outer winding 3a and an inner winding unit 40 (FIG. 2) including the inner winding 3b. 4) can be arranged around the iron core 2. FIG.

The outer winding 3a and the inner winding 3b are each constructed using a coated conductive wire such as a Litz wire, for example. The inner winding 3b is wound close to the iron core 2 and wound around the legs of the iron core 2 with a predetermined number of turns. The outer winding 3a is wound around the legs of the iron core 2 with a predetermined number of turns so as to surround the inner winding 3b.

The cooling jacket 4 is, for example, a water cooling type water cooling jacket, and includes a jacket main body 4a in which a circulation flow path (not shown) for circulating a cooling medium (for example, water) is formed, and a circulation flow path of the jacket main body 4a. and a connected inlet/outlet 4b. Similarly, the cooling jacket 5 is, for example, a water cooling jacket, and includes a jacket body 5a in which a circulation channel (not shown) is formed, and an inlet/outlet 5b connected to the circulation channel of the jacket body 5a.

The jacket bodies 4a and 5a are made of, for example, a metal material with high thermal conductivity such as copper or aluminum alloy. The jacket bodies 4a and 5a can efficiently exchange the heat generated by the outer winding 3a and the inner winding 3b with the cooling medium, respectively, and can efficiently radiate the corresponding heat to the outside. there is

As shown in FIG. 2, the transformer 1 of this embodiment includes an outer winding unit 30 including an outer winding 3a. The outer winding unit 30 seals the components other than the inlet/outlet 4b, that is, the outer winding 3a, the cooling jacket 4, and the high thermal conductive resin 6, with the sealing resin 7. As shown in FIG. As shown in FIG. 3, the outer winding unit 30 includes an outer winding 3a wound in, for example, a rectangular frame shape along the winding frame 8a, and an outer winding unit 30 with a high thermal conductive resin 6 interposed therebetween. A cooling jacket 4 having a jacket body 4a provided to face the wire 3a.

As shown in FIG. 4, the transformer 1 of this embodiment includes an inner winding unit 40 including an inner winding 3b. In the inner coil unit 40 , the components other than the inlet/outlet 5 b , that is, the inner coil 3 b , the cooling jacket 5 , and the high thermal conductive resin 6 are sealed with the sealing resin 9 . In addition, as shown in FIG. 5, the inner winding unit 40 faces the cooling jacket 5 arranged outside the winding frame (not shown) and the jacket main body 5a of the cooling jacket 5 with the high thermal conductive resin 6 interposed therebetween. and an inner winding 3b wound in, for example, a square frame shape along the winding frame.

The sealing resins 7 and 9 contain, for example, a prescribed synthetic resin such as epoxy resin and a prescribed filler such as alumina or silica. The sealing resins 7 and 9 are formed by, for example, molding so as to form the outer wall portion of the outer winding unit 30 and the outer wall portion of the inner winding unit 40, respectively (details will be described later). By forming the outer wall portion of the outer winding unit 30 and the outer wall portion of the inner winding unit 40 using the sealing resins 7 and 9 in this way, the outer winding 3a and the inner winding 3b and the cooling jacket The adhesion between 4 and 5 can be maintained for a long period of time, improving the reliability of cooling performance.

In addition, since the sealing resins 7 and 9 are formed so as to form the outer wall portion of the outer winding unit 30 and the outer wall portion of the inner winding unit 40, respectively, insulation weakening such as triple junction in the transformer 1 is prevented. parts can be protected. Furthermore, it is possible to prevent impurities such as dust from adhering to the outer winding 3a and the inner winding 3b, so that the insulation reliability can be easily improved. As a result, the transformer 1 of this embodiment can easily cope with the increase in voltage.

Further, the thermal conductivity of the sealing resins 7 and 9 is, for example, about 0.2 W/m·K or more and 0.6 W/m·K or less, so it is not necessary to contribute to the improvement of the cooling performance of the transformer 1. . In addition to the above description, for example, in the low voltage transformer 1 of 1 kV or less, instead of the sealing resins 7 and 9, the outer winding 3a and the inner winding 3b and the cooling jackets 4 and 5 are varnished. Each may be cemented together. The thermal conductivity of the varnish is also approximately the same as that of the sealing resins 7 and 9.

<Main configuration of transformer 1>
Next, the main configuration of the transformer 1 of the present embodiment will be specifically described with reference to FIGS. 6 to 9 as well. FIG. 6 is a diagram for explaining the main configuration of the outer winding unit. 7 is a front view showing the high thermal conductive resin shown in FIG. 6. FIG. 8 is a cross-sectional view taken along line VIII-VIII of FIG. 7. FIG. 9 is a cross-sectional view taken along line IX-IX of FIG. 7. FIG. In the following description, the main configuration of the outer winding unit 30 will be described as an example. Further, since the essential part configuration of the inner winding unit 40 is configured in the same manner as the essential part configuration of the outer winding unit 30, redundant description thereof will be omitted.

As shown in FIGS. 6 to 9, in the outer winding unit 30, the high thermal conductive resin 6 is formed on the main surface 4a1 facing the outer winding 3a of the cooling jacket 4 and on the side surfaces 4a2 and 4a3. That is, the high thermal conductive resin 6 has a first surface 6a1 that contacts the cooling jacket 4 and a second surface 6a2 that faces the first surface 6a1 and contacts the outer winding 3a. , are sandwiched between the cooling jacket 4 and the outer winding 3a.

Specifically, the high thermal conductive resin 6 is integrally provided on the main surface 4a1 and the side surfaces 4a2 and 4a3 of the cooling jacket 4 so as to cover the corners 4c1 and 4c2 of the cooling jacket 4. As shown in FIG. Thereby, the high thermal conductive resin 6 can improve the insulation performance between the outer winding 3a and the main surface 4a1 and side surfaces 4a2 and 4a3 of the cooling jacket 4. FIG. In addition, since the high heat conductive resin 6 is provided so as to cover the corners 4c1 and 4c2, it is possible to reliably improve the insulation performance of the corners 4c1 and 4c2, which are prone to electric field concentration and dielectric breakdown. can.

6 is shorter than the length of the main surface 4a1 of the cooling jacket 4 indicated by L2 in FIG. 6, and a sufficient creepage distance can be secured. can also omit forming the high thermal conductive resin 6 on the side surfaces 4a2 and 4a3 of the cooling jacket 4.

The high thermal conductive resin 6 contains, for example, a predetermined synthetic resin such as epoxy resin and a predetermined filler such as alumina. The thickness of the high thermal conductive resin 6 may be, for example, a value within the range of 0.5 mm to 0.8 mm, and the dielectric breakdown voltage for the cooling jacket 4 is, for example, approximately 20 kVrms/mm on average. The thickness of the high thermal conductive resin 6 is not limited to this, and can be changed according to the required dielectric breakdown voltage. The high thermal conductive resin 6 is integrally provided so as to cover the main surface 4a1 and side surfaces 4a2 and 4a3 of the cooling jacket 4 by, for example, molding. In addition to this description, for example, a coating method or the like may be used to integrally form the high heat conductive resin 6 so as to cover the main surface 4a1 and side surfaces 4a2 and 4a3 of the cooling jacket 4. FIG.

The thermal conductivity of the high thermal conductive resin 6 is, for example, 1.0 W/m·K or more and 7.0 W/m·K so as to have a thermal conductivity higher than that of the sealing resins 7 and 9 or the varnish. It has been adjusted to a value within the following range. Specifically, in the high thermal conductive resin 6, a material such as alumina having a higher thermal conductivity is used as a filler. Further, the density of the filler in the high thermal conductive resin 6 is higher than the density of the filler in the sealing resins 7 and 9 . For example, it is sufficient if the amount of the filler in the high thermal conductive resin 6 (that is, the density of the filler in the synthetic resin) is higher than the amount of the filler in the sealing resins 7 and 9 by 10% or more. , the greater the amount of filler compounded, the higher the thermal conductivity.

Due to the above configuration, the high thermal conductive resin 6 can efficiently transmit the heat generated in the outer winding 3a to the cooling jacket 4, and the heat can be transferred to the cooling jacket 4. The cooling performance of the transformer 1 can be reliably improved by efficiently cooling it with the cooling jacket 4 .

Further, in the cooling jacket 4, for example, by performing a honing process, the arithmetic mean roughness Ra of the main surface 4a1 and the side surfaces 4a2 and 4a3 is in the range of 1.0 μm or more and 100 μm or less, preferably 2.0 μm. It is set to a value within the range of 10 μm or less. Thus, in the transformer 1 of the present embodiment, by adjusting the surface roughness of the contact surface of the cooling jacket 4 with the high thermal conductive resin 6, the adhesion between the cooling jacket 4 and the high thermal conductive resin 6 is improved. can be increased, the crack resistance of the transformer 1 can be improved, and a more practical transformer 1 can be easily configured.

Further, in the high thermal conductive resin 6, for example, by performing honing treatment, the arithmetic average roughness Ra of the contact surface with the sealing resin 7 such as the second surface 6a2 is in the range of 1.0 μm or more and 100 μm or less, Desirably, it is set to a value within the range of 2.0 μm or more and 10 μm or less. Thus, in the transformer 1 of the present embodiment, by adjusting the surface roughness of the contact surface of the high thermal conductive resin 6 with the sealing resin 7, the contact surface between the high thermal conductive resin 6 and the sealing resin 7 is Adhesion can be improved, crack resistance in the transformer 1 can be improved, and a more practical transformer 1 can be easily configured.

<Manufacturing method of transformer 1>
Next, referring also to FIGS. 10 to 12, a method for manufacturing the transformer 1 of this embodiment will be specifically described. FIG. 10 is a flow chart showing a method for manufacturing a transformer according to Embodiment 1 of the present disclosure. 11A and 11B are diagrams for explaining the manufacturing process of the outer winding unit. 12A and 12B are diagrams for explaining the manufacturing process of the inner winding unit. In addition, in the following description, the manufacturing method of the main configuration of the transformer 1 will be mainly described.

As shown in step S1 in FIG. 10, for example, in the cooling jacket 4, the entire surface (six surfaces) including the main surface 4a1 and the side surfaces 4a2 and 4a3, which are the contact surfaces with the high thermal conductive resin 6, are subjected to honing. By applying the treatment, the surface roughness of the entire surface is adjusted to a value within the above range.

Next, as shown in step S2, for example, a high thermal conductive resin 6 is formed on the main surface 4a1 and the side surfaces 4a2 and 4a3 of the cooling jacket 4 by performing mold casting. Subsequently, as shown in step S3, the contact surface of the high thermal conductive resin 6 with the sealing resin 7 is honed to adjust the surface roughness of the contact surface to a value within the above range. do.

Next, as shown in step S4, the outer winding 3a is brought into contact with the high thermal conductive resin 6 and placed inside the mold. Thereafter, as shown in step S5, the sealing resin 7 is formed by casting the sealing resin 7 into a mold.

Specifically, as shown in FIG. 11, the winding frame 8a, the outer winding 3a, the high thermal conductive resin 6, and the cooling jacket 4 are arranged inside the mold K1. After that, the outer winding unit 30 shown in FIG. 2 is formed by casting the sealing resin 7 into the mold K1.

Further, as shown in FIG. 12, the bobbin 8b, the cooling jacket 5, the high thermal conductive resin 6, and the inner winding 3b are arranged inside the mold K2. After that, the inner winding unit 40 shown in FIG. 4 is formed by casting the sealing resin 9 into the mold K2.

The transformer 1 of the present embodiment configured as described above includes the outer winding 3a and the inner winding 3b, the cooling jackets 4 and 5 for cooling the outer winding 3a and the inner winding 3b, respectively, the cooling jacket 4 and the The high thermal conductivity resin 6 integrally provided on the outer winding 3a and inner winding 3b side of 5, the outer winding 3a and inner winding 3b, the cooling jackets 4 and 5, and the high thermal conductivity resin 6 are sealed, respectively. The sealing resins 7 and 9 are provided. The high thermal conductive resin 6 has higher thermal conductivity than the sealing resins 7 and 9 or the varnish. Further, as described above, by forming the high thermal conductive resin 6 on the water cooling jackets 4 and 5 in advance, the resin surface of the high thermal conductive resin 6 can be formed thin. Thus, in this embodiment, unlike the conventional example, it is possible to configure the transformer 1 capable of improving the cooling performance.

Further, in the transformer 1 of the present embodiment, the high thermal conductive resin 6 has a first surface 6a1 that contacts the cooling jacket 4 or 5, and a first surface 6a1 that faces the first surface 6a1. Having a contacting second surface 6a2, the high thermal conductive resin 6 is provided so as to be sandwiched between the cooling jacket 4 or 5 and the outer winding 3a or the inner winding 3b. As a result, in the transformer 1 of the present embodiment, the heat generated in the outer winding 3a and the inner winding 3b can be efficiently transmitted to the cooling jackets 4 and 5 through the high thermal conductive resin 6, and the transformer 1 can be more reliably improved.

Instead of providing the high thermal conductive resin 6 integrally with the cooling jackets 4 and 5, it is also conceivable to construct a comparative example in which a high thermal conductive prepreg is placed on the cooling jackets. However, this highly thermally conductive prepreg is a sheet-like member obtained by impregnating glass cloth or the like with a resin and semi-curing it, and is a thin member having a thickness of about 0.2 mm. Therefore, in this comparative example, it is necessary to laminate a plurality of high thermal conductivity prepregs in order to ensure insulation resistance to the cooling jacket. As a result, voids such as air are generated in the laminated body of the high thermal conductive prepreg, and the voids partially deteriorate the insulation performance, and the thickness of the laminated body causes the problem that the cooling performance is deteriorated. something happened.

On the other hand, in the present embodiment, the high thermal conductive resin 6 is provided integrally with the cooling jackets 4 and 5 by molding or coating. can be suppressed. In addition, in the present embodiment, the thickness of the high thermal conductive resin 6 can be made thinner than that of the laminate, so that deterioration of the cooling performance can be suppressed. The high thermal conductive resin 6 is formed by solidifying from a liquid state on the cooling jackets 4 and 5 rather than a laminate (high thermal conductive prepreg) in which different members are alternately laminated. Therefore, since voids are less likely to occur, the high thermal conductive resin 6 can be made thinner while ensuring insulation performance.

[Embodiment 2]
Embodiment 2 of the present disclosure will be specifically described with reference to FIG. 13 . FIG. 13 is a diagram illustrating the main configuration of the transformer 1 according to Embodiment 2 of the present disclosure. For convenience of description, members having the same functions as those of the members described in the above embodiments are denoted by the same reference numerals, and description thereof will not be repeated.

The main difference between the second embodiment and the first embodiment is that an outer winding 31a and an inner winding 31b wound in a cylindrical shape are used for the iron core 2 .

In the transformer 1 of this embodiment, a cylindrical inner winding 31b is wound around the iron core 2, as shown in FIG. A substantially circular high heat conductive resin 6 is provided in contact with the inside of the inner winding 31 b , and a substantially circular cooling jacket 5 is provided in contact with the high heat conductive resin 6 .

A cylindrical outer winding 31a is wound around the core 2 so as to surround the inner winding 31b. A substantially circular high heat conductive resin 6 is provided in contact with the outside of the outer winding 31 a , and a substantially circular cooling jacket 4 is provided in contact with the high heat conductive resin 6 .

With the above configuration, the transformer 1 of the second embodiment has the same effects as those of the first embodiment.

[Modification 1]
Modification 1 of the present disclosure will be specifically described with reference to FIG. 14 . FIG. 14 is a diagram illustrating a configuration of main parts of the transformer 1 according to Modification 1 of the present disclosure. For convenience of description, members having the same functions as those of the members described in the above embodiments are denoted by the same reference numerals, and description thereof will not be repeated.

The main difference between Modification 1 and Embodiment 1 is that the outer winding 52 and the inner winding 52 using edgewise winding are replaced with the outer winding 3a and the inner winding 3b using litz wires. 51 is provided.

In the transformer 1 of Modification 1, as shown in FIG. 14, the outer winding 52 and the inner winding 51 each use a single covered conductive wire having a rectangular cross-sectional shape. It is composed of edgewise windings formed by winding in the width direction (edgewise; the long side direction of a rectangular cross section).

With the above configuration, the transformer 1 of Modification 1 has the same effects as those of the first embodiment.

[Modification 2]
Modification 2 of the present disclosure will be specifically described with reference to FIG. 15 . FIG. 15 is a diagram illustrating the main configuration of the transformer 1 according to Modification 2 of the present disclosure. For convenience of description, members having the same functions as those of the members described in the above embodiments are denoted by the same reference numerals, and description thereof will not be repeated.

The main difference between Modification 2 and Embodiment 1 is that an outer winding 62 and an inner winding 61 using disk windings are used instead of the outer winding 3a and inner winding 3b using litz wires. This is the point where

In the transformer 1 of Modification 2, as shown in FIG. 15, each of the outer winding 62 and the inner winding 61 uses a single covered conductive wire having a rectangular cross section. It is composed of a disk winding formed by winding in the thickness direction (short side direction of a rectangular cross section).

With the above configuration, the transformer 1 of Modification 2 has the same effects as those of the first embodiment.

[Modification 3]
Modification 3 of the present disclosure will be specifically described with reference to FIG. 16 . FIG. 16 is a diagram illustrating the main configuration of the transformer 1 according to Modification 3 of the present disclosure. For convenience of description, members having the same functions as those of the members described in the above embodiments are denoted by the same reference numerals, and description thereof will not be repeated. Also, in FIG. 16, for simplification of the drawing, only the inner winding 71 is illustrated, and the illustration of the outer winding is omitted.

The main difference between Modification 3 and Embodiment 1 is that an inner winding 71 using a cylindrical winding is provided instead of the inner winding 3b using a litz wire.

In the transformer 1 of Modification 3, as shown in FIG. 16, the inner winding 71 uses a single covered conductive wire (for example, a rectangular wire) having a rectangular cross-sectional shape. It is a cylindrical winding wound in the axial direction so that the width direction is parallel to the axis of the iron core 2 (not shown), and is formed in, for example, seven layers (seven layers) of cylindrical lairs. The inner winding 71 has its winding start end and winding end end connected to terminals 71a and 71b, respectively. Further, in the inner winding 71 , among the seven layers, the high thermal conductive resin 6 is provided between the cooling jacket 5 and the layer closest to the cooling jacket 5 . In the inner winding 71, since the voltage difference between the layers is small between the remaining layers, the layers are insulated by the high thermal conductivity prepreg Pr. heat transfer is facilitated.

With the above configuration, the transformer 1 of Modification 3 has the same effects as those of the first embodiment.

〔summary〕
In order to solve the above problems, a winding device according to one aspect of the present disclosure includes a winding, a cooling jacket that cools the winding, and the cooling jacket that is integrally provided on the winding side a high thermal conductive resin, and a sealing resin or varnish that seals the windings, the cooling jacket, and the high thermal conductive resin, wherein the high thermal conductive resin has higher thermal conductivity than the sealing resin or the varnish. have a rate.

According to the above configuration, it is possible to provide a wire-wound device capable of improving cooling performance.

In the wire-wound device according to the above aspect, the high thermal conductive resin and the sealing resin each contain a predetermined synthetic resin and a predetermined filler, and the density of the filler in the high thermal conductive resin is the same as that in the sealing resin. It may be higher than the density of the filler.

According to the above configuration, the heat generated by the windings can be efficiently transferred to the cooling jacket by the high thermal conductive resin, and the heat is efficiently cooled by the cooling jacket, thereby reliably improving the cooling performance of the winding device. be able to.

In the winding device according to the above aspect, the high thermal conductive resin has a first surface that contacts the cooling jacket and a second surface that faces the first surface and contacts the winding, A high thermal conductive resin may be provided so as to be sandwiched between the cooling jacket and the winding.

According to the above configuration, the heat generated by the winding can be more efficiently transferred to the cooling jacket via the high thermal conductive resin, and the cooling performance of the winding device can be more reliably improved.

In the wire-wound device according to the above aspect, the high thermal conductive resin may be formed on the main surface and side surfaces of the cooling jacket.

According to the above configuration, it is possible to improve the insulation performance between the windings and the main surface and the side surface of the cooling jacket by the high thermal conductive resin, thereby suppressing the occurrence of dielectric breakdown.

In the winding device according to the above one aspect, in the cooling jacket, the arithmetic mean roughness Ra of the contact surface with the high thermal conductive resin may be a value within the range of 1.0 μm or more and 100 μm or less.

According to the above configuration, it is possible to improve the adhesion between the cooling jacket and the high thermal conductive resin, and it is possible to improve the crack resistance in the wire wound device and easily configure a more practical wire wound device. .

In the wire-wound device according to the above aspect, in the high thermal conductive resin, a contact surface with the sealing resin may have an arithmetic mean roughness Ra within a range of 1.0 μm or more and 100 μm or less.

According to the above configuration, it is possible to improve the adhesion between the high thermal conductive resin and the sealing resin, and it is possible to improve the crack resistance in the winding device and easily configure a more practical winding device. can.

In the wire-wound device according to the above aspect, the high thermal conductive resin may contain a predetermined synthetic resin and a predetermined filler, and may have a thermal conductivity of 1.0 W/m·K or more.

According to the above configuration, it is possible to reduce the thickness of the high thermal conductive resin while ensuring the insulation performance between the winding and the cooling jacket by the high thermal conductive resin, thereby more reliably improving the cooling performance of the winding device. can be made

Further, a method for manufacturing a wire wound device according to one aspect of the present disclosure is a method for manufacturing a wire wound device including a winding and a cooling jacket for cooling the winding, wherein the winding side of the cooling jacket is and forming a sealing resin that seals the winding, the cooling jacket, and the high thermal conductive resin, wherein the high thermal conductive resin is the sealing It has a higher thermal conductivity than the sealing resin.

According to the above configuration, it is possible to provide a method for manufacturing a wire-wound device capable of improving cooling performance.

The present disclosure is not limited to each embodiment described above, various modifications are possible within the scope shown in the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments are also included in the technical scope of the present disclosure.

1 Transformer (winding device)
3 winding 3a outer winding 3b inner winding 4, 5 cooling jacket 4a1 main surface 4a2, 4a3 side surface 6 high thermal conductive resin 6a1 first surface 6a2 second surface 7, 9 sealing resin

Claims (8)

a winding;
a cooling jacket that cools the winding;
a high thermal conductive resin integrally provided on the winding side of the cooling jacket;
A sealing resin or varnish that seals the windings, the cooling jacket, and the high thermal conductive resin,
The winding device, wherein the high thermal conductive resin has higher thermal conductivity than the sealing resin or the varnish. The high thermal conductive resin and the sealing resin each contain a predetermined synthetic resin and a predetermined filler,
The winding device according to claim 1, wherein the density of filler in said high thermal conductive resin is higher than the density of filler in said sealing resin. The high thermal conductive resin has a first surface that contacts the cooling jacket and a second surface that faces the first surface and contacts the winding,
3. The winding device according to claim 1, wherein said high thermal conductive resin is provided so as to be sandwiched between said cooling jacket and said winding. The winding device according to any one of claims 1 to 3, wherein the high thermal conductive resin is formed on the main surface and side surfaces of the cooling jacket. The winding device according to any one of claims 1 to 4, wherein, in the cooling jacket, the arithmetic mean roughness Ra of the contact surface with the high thermal conductive resin is a value within the range of 1.0 µm or more and 100 µm or less. . The winding according to any one of claims 1 to 5, wherein the high heat conductive resin has an arithmetic mean roughness Ra of a contact surface with the sealing resin within a range of 1.0 µm or more and 100 µm or less. machine. The winding according to any one of claims 1 to 6, wherein the high thermal conductive resin contains a predetermined synthetic resin and a predetermined filler, and has a thermal conductivity of 1.0 W/m·K or more. machine. A method for manufacturing a winding device comprising a winding and a cooling jacket for cooling the winding,
integrally forming a high thermal conductivity resin on the winding side of the cooling jacket;
forming a sealing resin that seals the windings, the cooling jacket, and the high thermal conductive resin;
The method of manufacturing a wire-wound device, wherein the high thermal conductive resin has higher thermal conductivity than the sealing resin.

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