JP3441734B2 - Coil winding, transformer using the same, and method of manufacturing coil winding - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a coil winding, a transformer using the same, and a method for manufacturing the coil winding, and in particular, it facilitates heat dissipation and can be cooled well, and can be used up to a high voltage. Can coil winding,
The present invention relates to a transformer using the same, and a method for manufacturing a coil winding.

BACKGROUND ART A molded coil formed by molding a conductor winding with epoxy resin has excellent mechanical strength, insulation performance, and moisture resistance, and has many disaster-prevention advantages such as flame retardancy. Demand is increasing. A mold transformer using this mold coil has recently been required to have a smaller size and a lower price. In order to meet this demand, a structure with more excellent heat dissipation characteristics is indispensable.

The winding structure of the conventional mold coil is roughly divided into the following structures. One is, for example, as described in JP-A-63-72106 (hereinafter, known example), a round wire or a rectangular wire is wound in a cylindrical shape in the axial direction, and an insulating material is provided on the outer peripheral side thereof. And a winding conductor is further wound thereon. This is repeated a predetermined number of times to form a winding unit, and a required number of winding units are connected in series in the axial direction to form a coil winding.

The other is, for example, JP-A-54-104529 (hereinafter,
As described in (Publication example), a strip-shaped conductor is wound in a tubular shape with an insulating material interposed to form a winding unit, which is arranged in the required number in the axial direction and connected in series. A coil winding is formed.

The heat generated in the coil (mainly the Joule heat generated by the resistance of the winding) is finally dissipated from the outer surface of the coil, that is, the inner and outer peripheral surfaces, and the end in the axial direction. Since it has a cylindrical shape which is long in the axial direction as seen in known examples and the like, a large amount of heat is radiated to the outside of the coil from the inner and outer peripheral surfaces having a remarkably large area as compared with the axial end portion.

Therefore, the heat generated inside the coil mainly flows in the radial direction, but in the conventional coil structure as described above, an insulator having a small heat conduction (about three digits compared to the heat conduction of the conductor) is used. (Small) are arranged so as to divide a large number of radial directions. Therefore, in these coil structures, the flow of heat in the radial direction is blocked and the temperature difference between the temperature inside the coil and the temperature on the coil surface is large, resulting in a poor heat dissipation characteristic.

As a proposal for improving the heat dissipation characteristics of such a conventional coil structure, there is Japanese Utility Model Laid-Open No. 56-63030 (hereinafter, referred to as a known example).

This is to wind while winding the strip-shaped conductors while stacking them in the axial direction through the insulators, and since the strip-shaped conductors are continuous from the inner peripheral side to the outer peripheral side without interposing an insulator that divides the radial direction, This has the advantage of efficiently transferring the heat generated inside the coil to the inner and outer peripheral surfaces. As a result,
A coil with excellent heat dissipation characteristics can be obtained.

Further, regarding the above-mentioned method for manufacturing the molded coil, as described in, for example, a known example and JP-A-56-161625 (hereinafter referred to as a known example), etc., it is formed as described above. A method in which a coil winding is fixed at a predetermined position in a mold, a thermosetting resin is injected, and this is heat-cured to form a molded coil has been used as a powerful molding means.

However, in the known example, there is a drawback that due to the winding structure, leakage flux generated between the low-voltage coil and the high-voltage coil is interlinked, and the eddy current loss at the coil end increases.

Further, in all of these publicly known examples, and since the conductor winding is molded with epoxy resin or the like, not only the entire apparatus becomes large, but also work such as resin injection is required, and it takes time to manufacture the coil. In addition, it is troublesome, and a new mold is required for each coil having a different shape or size, so that the number of molds increases, and there is a problem that the storage and maintenance thereof are troublesome.

The present invention has been made in view of the above points. A first object of the present invention is not only to have excellent heat dissipation characteristics, but also to make the coil winding that is easy to manufacture and small, and It is to provide a transformer used and a method of manufacturing a coil winding.

A second object of the present invention is to provide a coil winding capable of reducing eddy current loss at the end of the coil as well as excellent heat dissipation characteristics, and a transformer using the coil winding. It is in.

DISCLOSURE OF THE INVENTION The first object of the present invention is to use a prepreg tape as an insulating material that insulates the band-shaped conductors or is interposed between the band-shaped conductors to insulate each other, and the band-shaped conductors are fixed to each other via the prepreg tape. The coil windings that are integrated with each other, the low-voltage coil that is arranged around the iron core, or the high-voltage coil that is mounted around this low-voltage coil are wound a predetermined number of times while the band-shaped conductor and the prepreg tape are stacked in the axial direction. A transformer in which the band-shaped conductors are wound and fixed to each other via the prepreg tape, and the first end insulator is fitted to the insulating cylinder, and then the band-shaped conductor wound with the prepreg tape is corrugated. And then winding it around the insulating cylinder, and when it reaches the center in the axial direction, an intermediate insulator is provided, after which the direction in which the wavy convex portion of the band-shaped conductor projects is changed. Then, after further winding a predetermined number and attaching the second end insulating material on the side opposite to the first end insulating material, the outer layer insulation is applied, and then the whole is heated while being pressed from above and below to be cured. This is achieved by a method of manufacturing a coil winding formed by

The second purpose is that at each of the coil axial ends, the cross-section inner diameter side end of the strip-shaped conductor is inclined so as to be on the axial center side as compared with the outer diameter side end, or at both ends in the coil axial direction. Whether the cross section of the strip-shaped conductor is inclined so as to be substantially parallel to the direction of the leakage magnetic flux at both ends in the coil axial direction,
Alternatively, the coiled winding is characterized in that the bent protrusions of the strip-shaped conductor are arranged so as to be on the axial center side at both ends in the coil axial direction, and the strip-shaped conductor of the high-voltage coil is formed at each end in the coil axial direction. The inner diameter side end of the is inclined so as to be on the axial center side compared to the outer diameter side end, or the cross section of the band-shaped conductor at both axial ends of the high voltage coil occurs between the low voltage coil and the high voltage coil. Is it inclined so as to be substantially parallel to the direction of the leakage magnetic flux at both ends in the coil axial direction, or is the bent convex portion of the strip-shaped conductor of the high-voltage coil arranged on the axial center side at both ends in the coil axial direction? , At each of the coil axial ends, the cross-sectional outer diameter side end of the strip conductor of the low-voltage coil is inclined so as to be on the axial center side compared to the inner-diameter side end, or both ends of the low-voltage coil in the axial direction Obi in This is achieved by using a transformer in which the cross section of the conductor is inclined so as to be substantially parallel to the directions of the leakage magnetic flux at both ends in the coil axial direction generated between the low voltage coil and the high voltage coil.

In the present invention, the band-shaped conductors are stacked in the axial direction and wound around the prepreg tape, so that the band-shaped conductors are continuous from the inner peripheral side to the outer peripheral side without interposing an insulator that divides the radial direction in the radial direction. Since the heat generated inside the coil is efficiently transmitted to the inner and outer peripheral surfaces, it has excellent heat dissipation characteristics, and of course, because prepreg tape is used, it is possible to fill and cure with a thermosetting resin as in the past. The above first object can be achieved because the resin flowing from the prepreg tape can bond and integrate not only the band-shaped conductors but also other insulators.

Further, in the present invention, the heat dissipation characteristics are excellent for the same reason as described above, and the leakage magnetic flux generated between the low-voltage coil and the high-voltage coil and the band-shaped conductor are almost parallel to each other. Since the eddy current loss generated inside the line conductor can be reduced, the second object can be achieved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing an embodiment of the coil winding of the present invention, FIG. 2 is a partial perspective view showing a strip conductor adopted in FIG. 1, and FIG. FIG. 4 is a plan view showing a bent state of a strip-shaped conductor used, FIG. 4 is a sectional view taken along the line AA ′ in FIG. 3, FIG. 5 is a sectional view taken along the line BB ′ in FIG.
FIG. 7 is a cross-sectional view showing another embodiment of the coil winding of the present invention, FIG. 7 is a schematic perspective view showing a manufacturing method of the coil winding of the present invention, and FIG. 8 is pressurization of the coil winding of the present invention. FIG. 9 is a perspective view showing a state, FIG. 9 is a cross-sectional view showing still another embodiment of the coil winding of the present invention, FIG. 10 is a partial perspective view showing another example of the band-shaped conductor used in the present invention, and FIG. Is a partial plan view showing a bent state of another example of the strip-shaped conductor used in the present invention, FIG. 12 is a partial plan view showing a bent state of still another example of the strip-shaped conductor used in the present invention, and FIG. A plan view showing how to bend the strip conductor when the present invention is applied to a rectangular coil, FIG. 14 is a schematic configuration diagram of a transformer showing the distribution of leakage flux in a low voltage and high voltage coil of the transformer of the present invention, FIG. 15 is an explanatory view showing an example of a method of interlinking the band-shaped conductor and the leakage magnetic flux in the present invention, and FIG. 16 is shown in FIG. Fig. 17 is an explanatory view showing how eddy currents flow, Fig. 17 is an explanatory view showing an example of how the conventional band-shaped conductor and leakage flux are interlinked, and Fig. 18 shows how eddy currents flow in Fig. 17. Explanatory drawing, FIG. 19 is a partial perspective view showing a conductor shape used in another embodiment of the coil winding of the present invention, FIG.
FIG. 1 is a sectional view showing another embodiment of the coil winding of the present invention,
FIG. 21 is a partial perspective view showing an example in which slits are provided in a band-shaped conductor adopted in the present invention, and FIG. 22 is a sectional view showing an example of a coil winding formed using the prepreg tape of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be specifically described below with reference to the drawings.

FIG. 1 shows an embodiment of the coil winding of the present invention, which is an example in which the present invention is applied to the high voltage coil 22 of the transformer configuration shown in FIG.

As shown in FIG. 14, the transformer is roughly configured by arranging a low voltage coil 21 around an iron core 23 and a high voltage coil 22 around the iron core 23. The low-voltage coil 21 and the high-voltage coil 22 are formed by winding a strip conductor such as a metal strip or a metal foil such as copper or aluminum with an insulator interposed therebetween, and electrically connecting them in series. .

As shown in FIG. 1, as the conductor in the coil winding of the present embodiment, for example, as shown in FIG.
A prepreg tape 2 wound as an insulator is used. The prepreg tape 2 is, for example, a glass tape base material impregnated with a thermosetting resin such as an epoxy resin, and a curing reaction is promoted to some extent to form a semi-cured state. As this prepreg tape, it is also possible to use a glass tape as a base material, to which a mica piece is attached to improve the insulating property, or to add an inorganic powder to the impregnated resin to improve the thermal conductivity. it can. Further, as will be described later, it is also a promising means to use a prepreg tape containing a large amount of resin, using a porous base material such as a glass nonwoven fabric in order to fill a gap formed in the vicinity of the conductor. In short,
A woven cloth of glass fiber, polymer fiber or natural fiber is used as a base material, which is impregnated with a thermosetting resin to advance a curing reaction to a certain degree to form a semi-cured prepreg tape, glass fiber, polymer fiber, or natural fiber. Based on a non-woven fabric of fibers,
This is impregnated with a thermosetting resin, and the curing reaction proceeds to a certain extent to make it a semi-cured prepreg tape or film material as a base material. It may be a prepreg tape.

As one method for winding the strip-shaped conductor 1 into a disc shape, there is a method described in the above-mentioned known example, which is shown in FIG. As shown in FIG. 3, this is a method in which the strip-shaped conductor 1 is rolled up while forming a convex portion 8 that is bent at the fold line 7 (either travels vertically to the paper surface or is dented). In this case, the cross section taken along the line AA 'in FIG. 3 is as shown in FIG. 4 and the horizontal view taken along the line BB' is as shown in FIG. By making the convex portions 8 exactly overlap with each other, a compact winding can be performed in the axial direction.

In FIG. 1 showing an embodiment of the present invention, the cross section on the right side shows the AA 'cross section and the left side shows the BB' cross section. As can be seen from the cross-sectional view on the left side of FIG. 1, in the present invention, the bending convex portion 8 formed by bending is configured so that both ends thereof are on the axial center side.

FIG. 6 shows a special case of FIG. 1, which is AA ′ of FIG.
FIG. 4 showing the cross section is an example in the case of being horizontal (in FIG. 1, the inner peripheral side is inclined so as to fall).

By doing so, the direction of the leakage magnetic flux generated by the load current of the winding and the width direction of the strip conductor 1 become close to parallel, so that the eddy current loss generated in the strip conductor 1 can be reduced.

This effect will be described with reference to the drawings. FIG. 14 shows an iron core 23, a low voltage coil 21, and a high voltage coil 22 which constitute the transformer of the present invention.
And the general direction of the leakage flux 24. As is clear from FIG. 14, at the axial end of the high voltage coil 22, the high voltage coil 22 and the leakage magnetic flux 24 are diagonally linked.

Now, assuming that the leakage magnetic flux 24 is interlinked with the strip-shaped conductor that constitutes the high-voltage coil 22 that is considerably wider than the thickness, FIG.
And consider the case of Fig. 17 and compare the eddy current loss.
FIG. 16 shows a conductor cross section in a plane perpendicular to the leakage magnetic flux 24 in FIG.

As shown in FIG. 15, when the leakage magnetic flux 24 and the strip conductor 1 are substantially parallel to each other, the eddy current 25 has its flow limited by the thin conductor thickness as shown in FIG. It will flow in the specified cross section. In contrast, the 17th
As shown in the figure, when the leakage magnetic flux 24 interlinks in a state of being almost perpendicular to the surface of the strip-shaped conductor 1, the conductor cross section perpendicular to the leakage magnetic flux 24 is wide as shown in FIG. Flows over the entire surface of the strip conductor 1 and the eddy current loss increases.
Now, comparing the eddy current loss when the thickness of the strip conductor 1 is 0.5 mm and the width is 40 mm, FIG. 15 shows 1/50 to 1/10 of the case of FIG.
It becomes as small as 0.

That is, the present invention utilizes this relationship, and is characterized in that the coil winding is formed by inclining the strip-shaped conductor cross-sections at both ends in the coil axial direction so as to be close to parallel to the direction of the leakage magnetic flux 24. . Since this corresponds to FIG. 15 described above, a large effect of reducing eddy current loss can be obtained as in the above description.

Further, as shown in the right cross section of FIG. 6, in the horizontal portion of the strip conductor 1, the leakage magnetic flux 24 interlinks with the strip conductor 1 at an angle, so that the intermediate portion between FIG. 15 and FIG. However, the shape of the bent portion is close to the direction of the leakage magnetic flux 24 shown on the left side of FIG. Therefore, the value of the eddy current loss can be reduced as compared with the case where no consideration is given.

Further, as shown in FIG. 1, by tilting the entire winding (because bending is performed, the angle of inclination on the right side is different from the angle on the left side), the deviation between the width direction of the strip-shaped conductor 1 and the direction of the leakage magnetic flux is further reduced. Therefore, there is an effect that the eddy current loss can be further reduced.

Next, a coil forming method using a prepreg tape, which is a main forming means in the present invention, will be described with reference to FIG.

As shown in FIG. 22, the band-shaped conductor 1 in which the prepreg tape 2 is wound around the insulating tube 3 is axially wound up as shown in the drawing, and after the end insulating ring 5 is attached to the axial end, the outer insulating layer is formed. Wrap 4 Insulation tube 3 is strip conductor 1
After winding up, it may be inserted on the inner peripheral side. The prepreg tape 2 may be wound while being sandwiched between the band-shaped conductors 1 instead of being wound. A prepreg tape may be used as the outer insulating layer 4.

The coil winding wound in this manner is heated and, at the same time, is pressurized with a pressing force P from above and below as shown in the figure. In prepreg molding, by heating and applying pressure to the prepreg tape 2 to cause the resin in the prepreg tape 2 to flow, the defects such as the air layer remaining around the conductor are extruded to obtain an insulating layer with few defects. Is. Further, as a result, the prepreg material and the conductor are brought into close contact with each other, so that the adhesive force between them can be improved. if,
If the pressure is not sufficiently transmitted to the prepreg tape 2,
There is concern that defects may occur in the insulating layer.

However, the structure of the present invention as shown in FIG.
Since the band-shaped conductor 1 provided with the prepreg tape 2 is only spirally wound in the axial direction, the pressure can be easily transmitted in the axial direction, and the pressing force from above and below is sufficiently transmitted to the inside of the coil. . Further, the resin extruded by the pressure fills the gap between the strip-shaped conductors 1 and also penetrates into the insulating cylinder 3 and the end insulating ring 5 on the inner peripheral side and hardens, so that these are integrated. Stuck to.

As described above, according to the structure of the present invention, the prepreg tape 2 can be used to form an insulating layer having few defects and a mechanically strong coil.

Next, the method for manufacturing the coil winding of the present invention will be specifically described.

The coil winding of the present invention is manufactured, for example, by the procedure as schematically shown in FIG. That is, after the end insulating ring 5 which is the end insulating material is fitted into the insulating tube 3, the band-shaped conductor 1 around which the prepreg tape 2 is wound is processed into a wave shape.
The band-shaped conductor 1 is deformed (forms the bent convex portion 8 shown in FIG. 3) through the space between 9, 10 and, as shown in FIG.
It is wrapped around the insulating cylinder 3 set on the turntable 11. Axial center (not necessarily center)
The intermediate insulating ring 6 is provided at the point where the winding has advanced to the point where the protruding direction of the bending convex portion 8 is changed (winding so as to project to the axial end side), and the winding is further performed a predetermined number of times, and then the opposite end insulation Install ring 5. After winding the winding while mounting the plurality of insulating rings in this manner, the outer insulating layer 4 is wound. The insulating cylinder 3 may be prepared by winding a prepreg around a separately prepared mandrel (winding frame) and heat-curing it. Alternatively, the insulating cylinder 3 may be separately cast using a filler-containing epoxy resin and the outer surface may be shot-blasted. Good. Alternatively, in FIG. 1, FIG. 6, or FIG. 7, a mandrel may be separately prepared, and a prepreg may be wound on the mandrel, and the mandrel may be simultaneously cured during the curing process of the winding portion described later.

One surface of the end insulating ring 5 (on the side of the winding in the axial direction) and both surfaces of the intermediate insulating ring 6 in the axial direction need to have a shape corresponding to the bent convex portion 8 of the winding. For that purpose, using a gear device shown in FIG. 7 and the like, a mold material having an appropriate thickness is bent into the same shape and pitch as the winding, and for example, a filler-containing epoxy resin is cast. it can. In this case, the surface is preferably subjected to shot blast treatment or the like in order to improve the adhesive strength. Of course, it may be manufactured by another method such as machining.

As the outer insulating layer 4, a prepreg material similar to that used for the interlayer insulating material of the winding may be used, or a film material to which an adhesive is applied may be wound. It is also possible to wind a resin-impregnated glass tape or the like and absorb the resin flowing out from the prepreg in the curing process described later to this portion to form the insulating layer. In this case, it is necessary to carry out after sufficiently grasping the amount of resin flowing out from the prepreg and the amount absorbed by the outer insulating layer 4.

As shown in FIG. 1, the winding wound in this manner is heated while being pressed by a pressing force P from above and below to harden the winding. During this temperature raising process, the semi-cured resin of the prepreg material is in a fluidized state again, and pressure is applied from above and below, so that it flows out from the prepreg material and the upper and lower portions of the winding, the winding and the end insulating ring 5, The gaps remaining between the winding and the insulating cylinder 3 and between the winding and the outer insulating layer 4 are filled.

The simplest method for realizing this state is shown in FIG.
The bolts 13 and nuts 14 shown in the external drawing are for applying pressure from above and below, and when they are tightened, pressure is applied to the winding through the end holding plate 12. The pressing force is applied when the temperature is raised to an appropriate temperature for softening the prepreg (nut
14 is tightened), compressed to a predetermined dimension (design coil height) (coil height is reduced), and held in that state until the end of curing. In the case of actually mass-producing coils, it is possible to use a device having a press mechanism capable of controlling the pressing force and the amount of coil deformation. Further, when the prepreg material is also used for the outer insulating layer 4, it is necessary to provide an outer mold from the outer peripheral side as well, or apply heat by winding a heat-shrinkable tape.

In such a molding method, the resin flowing out from the prepreg is used to bond the end insulating ring 5, the insulating cylinder 3 on the inner peripheral side, etc., and to fill the gap generated in the winding portion. Therefore, it may be appropriate that the amount of resin contained in the prepreg is larger than usual. In that case, the prepreg may be formed using a porous base material such as a glass non-woven fabric as touched a little before. When it is desired to obtain a resin having an intermediate amount of these, a substrate such as a glass non-woven fabric or a glass woven fabric may be appropriately combined and used. Furthermore, by adding an inorganic filler to the resin impregnated in these prepreg materials, the thermal conductivity of this portion can be increased.

By doing so, the winding conductor (strip-shaped conductor 1), the end insulating ring 5, the insulating tube 1, and the outer insulating layer 4 are integrated, so that a robust and compact coil winding can be obtained. it can. Further, in the coil winding having this structure, the band-shaped conductor 1 having a high thermal conductivity is continuous from the inner peripheral side to the outer peripheral side, so that an extremely good heat dissipation characteristic can be obtained.

Further, as described above, the strip-shaped conductor 1 is inclined at both ends in the coil axial direction, so that the eddy current loss caused by interlinking with the leakage magnetic flux can be significantly reduced. In addition, this manufacturing method also has an effect of facilitating coil manufacturing, such as a step of winding resin and a heating and pressurizing step for hardening the resin, which does not require resin injection.

Up to now, the manufacturing method in which the prepreg tape 2 is used as the outer insulating layer and the temperature is raised under pressure to be cured is explained, but as shown in FIG. 9, the inner peripheral die 15, the outer peripheral die 16,
Alternatively, the container may be constituted by the bottom plate 17 and the winding block described with reference to FIG. 1 may be placed therein, and the periphery thereof may be filled with an epoxy resin 18 mixed with an inorganic powder such as a feller and cured by heating.

In this case, the end insulating ring is not necessary,
The winding may be floated at a predetermined position with an appropriate spacer. Further, in FIG. 9, an interlayer insulating material is wound around the winding wire as in FIG. 1, but as shown in FIG. 10, an insulating material wider than the strip conductor 1 (prepreg tape 2 ) May be used in combination. However, in this case, in order to facilitate bending and the like of the strip-shaped conductor 1 described above, it is preferable to previously integrate the insulating agent and the strip-shaped conductor 1 with an adhesive or an adhesive. .

Although the method described in FIG. 3 is shown as a method of bending the strip-shaped conductor when winding the strip-shaped conductor in a spiral shape while bending the strip-shaped conductor, one point of the fold of the bending convex portion 8 as shown in FIG. Alternatively, the bending method as shown in FIG. 11 or FIG.

In coil winding, a rectangular coil that matches the cross-sectional shape of the iron core is often used.
As shown in FIG. 13, processing may be performed so that the bent convex portion is located at the curved portion of the strip-shaped conductor.

FIG. 20 shows another embodiment of the present invention, in which the spirally wound coil winding is formed while the strip-shaped conductor 1 is inclined. FIG. 19 shows a strip-shaped conductor 1 provided with insulation (prepreg tape 2) for use in this.

This embodiment shows an example in which the strip-shaped conductor 1 is used in a state of being bent edgewise (while extending the outer peripheral side) to some extent. Usually, when winding a strip conductor in an edgewise manner, the strip conductor is bent while being extended, and the strip conductor is wound into a flat and flat disc shape until the radius of the strip conductor is the same as the radius of the winding. In the case of FIG. 20, the strip conductor 1 after bending
The inner radius of the coil is set to be larger than the radius of the coil winding. By winding it while tilting the cross section of the strip-shaped conductor 1 as shown in FIG. 20, a coil winding having a predetermined radius can be obtained.

It goes without saying that even with such a winding method, the eddy current loss caused by the interlinkage with the leakage magnetic flux can be reduced for the reason described with reference to FIGS. 14 to 18.

The above description has been made symmetrically with respect to the high voltage coil 22 in FIG. 14, but when applied to a low voltage coil,
Considering the direction of the leakage magnetic flux in the low voltage coil 21 shown in the figure, it may be tilted in the opposite direction to the high voltage coil 22.

FIG. 21 shows an example of a case where eddy current loss needs to be further reduced in addition to the above-mentioned means. That is, when it is necessary to further reduce the eddy current loss, a plurality of slits 26 are provided alternately in the width direction of the strip-shaped conductor 1 in parallel with the lengthwise direction of the strip-shaped conductor 1 to substantially reduce the surface area of the strip-shaped conductor 1. It is good to disperse.

By doing so, the path through which the eddy current flows can be further restricted, which is effective in reducing the eddy current.

Although FIG. 21 shows the shape of a complete slit, it is not always necessary to cut the conductor, and for example, a V-shaped groove is embossed to limit the thickness (for example, about 1/10). ) Can also be effective. When a complete slit is provided, the heat conduction in the radial direction is slightly hindered by it, but the method of limiting the thickness can alleviate the problem of reduced heat conduction.

Various embodiments of the present invention have been described above. To summarize the effects of the invention, first, the thermal conductivity in the radial direction can be increased, so that the size and weight of the coil can be reduced, and the increase in eddy current loss can be reduced. A winding and a transformer using the winding can be provided.

Further, in the coil winding structure of the present invention, since the voltage between the upper and lower ends of the winding wound in the axial direction is only one turn (usually about several tens of volts), partial discharge is not generated inside the coil winding. There is an effect that the insulation characteristics are excellent such that it is almost unthinkable.

INDUSTRIAL APPLICABILITY According to the coil winding of the present invention described above, the transformer using the same, and the method of manufacturing the coil winding, the strip conductor is subjected to an insulation treatment or is interposed between the strip conductors. A coil winding in which an insulating material that insulates each other is used as a prepreg tape, and the band-shaped conductors are fixed and integrated via the prepreg tape, a low-voltage coil arranged around an iron core, or this low-voltage coil A transformer in which a high-voltage coil mounted around the coil is wound a predetermined number of times while a band-shaped conductor and a prepreg tape are stacked in the axial direction, and the band-shaped conductors are fixed to each other via the prepreg tape. After fitting the first end insulator on the insulating tube, the band-shaped conductor wound with the prepreg tape is processed into a wavy shape, which is wound around the insulating tube, which is centered in the axial direction. The intermediate insulating material is provided at the time of winding up, and then the protruding direction of the wavy convex portion of the band-shaped conductor is changed and further wound up by a predetermined number, and the second end portion is opposite to the first end insulating material. After the insulation is attached, the outer layer insulation is applied, and then the coil winding is manufactured by heating and curing the whole while applying pressure from the top and bottom. Since it is continuous without an insulator that divides the radial direction up to the side, the heat generated inside the coil is efficiently transmitted to the inner and outer peripheral surfaces, so of course it has excellent heat dissipation characteristics, as well as prepreg tape. Since it is used, it is not necessary to fill and cure the thermosetting resin as in the past, and the resin flowing from the prepreg tape fixes not only the band conductors but also other insulators. Because it can be integrated, heat Not only the emission characteristics are excellent, but also the production is simple and a small device can be obtained.

Also, at each of the coil axial ends, the cross-section inner diameter side end of the strip-shaped conductor is inclined so as to be on the axial center side compared to the outer diameter side end, or the cross-section of the strip-shaped conductor at both ends in the coil axial direction is , Being inclined so as to be substantially parallel to the direction of the leakage magnetic flux at both ends in the coil axial direction, or being configured so that the bent convex portions of the strip-shaped conductor are on the axial center side at both ends in the coil axial direction. In each of the coil winding and the coil axial end portion, the cross-section inner diameter side end portion of the strip conductor of the high-voltage coil is inclined so as to be on the axial center side as compared with the outer diameter side end portion, The cross section of the strip-shaped conductor at both ends of the high-voltage coil in the axial direction is inclined so as to be substantially parallel to the direction of the leakage flux at both ends in the axial direction of the coil generated between the low-voltage coil and the high-voltage coil, or the strip-shaped conductor of the high-voltage coil is folded. The bending protrusions are configured so as to be on the axial center side at both ends in the coil axial direction, or at each of the coil axial ends, the cross-sectional outer diameter side end of the strip conductor of the low-voltage coil is the inner diameter side end. Is inclined so as to be closer to the center side in the axial direction than the section, or the cross section of the band-shaped conductor at both axial ends of the low-voltage coil corresponds to the direction of the leakage magnetic flux at both ends in the coil axial direction generated between the low-voltage coil and the high-voltage coil. Since it is a transformer that is inclined so as to be substantially parallel, it is of course excellent in heat dissipation characteristics for the same reason as above, as well as the leakage flux and the strip shape generated between the low-voltage coil and the high-voltage coil. Since the conductor and the conductor are almost parallel to each other, the eddy current loss generated inside the winding conductor can be reduced. Therefore, not only the heat dissipation characteristic is excellent, but also the eddy current loss at the coil end can be reduced. The effect of saying is there.

Front page continuation (72) Inventor Izuna Tomomi 4-6-24, Toyohashi, Shibata, Niigata (56) References JP-A-55-50924 (JP, A) JP-A-57-149702 (JP, A) JP-A-56-35403 (JP, A) JP-A-1-309309 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) H01F 27/28 H01F 27/32 H01F 41 / 06

Claims (13)

(57) [Claims] 1. An insulating tube, a band-shaped conductor wound around the insulating tube a predetermined number of times, an insulating material applied to the band-shaped conductor, or an insulator interposed between the band-shaped conductors to insulate each other. End insulators provided at both ends in the axial direction of the strip conductor wound a predetermined number of times, intermediate insulators provided at substantially central portions in the axial direction of the strip conductor wound a predetermined number of turns, and the predetermined number of turns An outer layer insulator provided on the outer side of the strip-shaped conductor to be formed, in a coil winding formed by winding a predetermined number while stacking the strip-shaped conductor and the insulator in the axial direction, the insulator is a prepreg tape, A coil winding characterized in that the band-shaped conductors are fixed to each other via the prepreg tape, and the end insulating material, the intermediate insulating material, and the outer layer insulating material are also fixed and integrated. 2. A strip-shaped conductor, an insulator for insulating the strip-shaped conductor or interposed between the strip-shaped conductors to insulate each other, an inner peripheral side of the strip-shaped conductor wound a predetermined number of times, and In a winding provided with an insulator arranged on the outer peripheral side, the width direction end portion of the strip-shaped conductor is wound a predetermined number of times in the axial direction so as to reach the inner peripheral side insulator and the outer peripheral side insulator, respectively, A coil winding characterized in that the strip-shaped conductor is inclined at each of axial end portions of the coil such that a cross-sectional inner diameter side end portion of the strip conductor is on an axial center side as compared with an outer diameter side end portion. line. 3. A strip-shaped conductor, an insulator for insulating the strip-shaped conductor or interposed between the strip-shaped conductors to insulate each other, an inner peripheral side of the strip-shaped conductor wound a predetermined number of times, and A coil winding comprising an insulator arranged on the outer peripheral side, and a predetermined number of turns in the axial direction so that the widthwise end portions of the strip conductor reach the inner peripheral insulator and the outer peripheral insulator, respectively. A coil winding, wherein the cross section of the strip-shaped conductor at both ends in the coil axial direction is inclined so as to be substantially parallel to the direction of the leakage magnetic flux at each end in the coil axial direction. 4. A belt-shaped conductor, and an insulating material which performs an insulating treatment on the belt-shaped conductor or which is interposed between the belt-shaped conductors to insulate each other, and the belt-shaped conductor is formed with a bent convex portion at a fold. Also, in a coil winding formed by winding a predetermined number of turns in the axial direction so that the bending protrusions between the turns overlap, the bending protrusions of the strip-shaped conductor are located on the axial center side at both ends in the coil axial direction. The coil winding is characterized in that 5. The coil winding according to claim 2, wherein the insulator is formed of a prepreg tape, and the band-shaped conductors are fixed and integrated via the prepreg tape. line. 6. A transformer comprising an iron core, a low-voltage coil placed around the iron core, and a high-voltage coil mounted around the low-voltage coil, wherein the high-voltage coil has a belt-shaped conductor and a prepreg tape as an axis. A transformer characterized in that it is wound a predetermined number of times while being stacked in the direction, and the band-shaped conductors are fixed to each other via the prepreg tape to be integrally formed. 7. A transformer comprising an iron core, a low-voltage coil placed around the iron core, and a high-voltage coil mounted around the low-voltage coil, wherein the low-voltage coil comprises a strip-shaped conductor and a prepreg tape. A transformer characterized in that it is wound a predetermined number of times while being stacked in the direction, and the band-shaped conductors are fixed to each other via the prepreg tape to be integrally formed. 8. An iron core, a low-voltage coil placed around the iron core, and a high-voltage coil mounted around the low-voltage coil, wherein the high-voltage coil is subjected to an insulation treatment or an insulator is interposed. In a transformer formed by winding a predetermined number of turns in the axial direction so that the end portions in the axial direction of the band-shaped conductor wound by a predetermined number of turns reach the inner-side insulator and the outer-side insulator, respectively. Is a transformer characterized in that at each of the coil axial end portions, the cross-section inner diameter side end portion of the strip-shaped conductor is inclined so as to be on the axial center side as compared with the outer diameter side end portion. 9. An iron core, a low-voltage coil placed around the iron core, and a high-voltage coil mounted around the low-voltage coil, wherein the high-voltage coil is subjected to an insulation treatment or an insulator is interposed. A predetermined number of turns of the strip-shaped conductor are wound a predetermined number of times in the axial direction so that the end portions in the axial direction reach the insulator on the inner peripheral side and the insulator on the outer peripheral side, respectively. A transformer, wherein the cross sections of the strip-shaped conductors at both ends are inclined so as to be substantially parallel to the directions of the leakage magnetic fluxes at both ends in the coil axis direction generated between the low-voltage coil and the high-voltage coil. 10. An iron core, a low-voltage coil placed around the iron core, and a high-voltage coil mounted around the low-voltage coil, wherein the high-voltage coil is subjected to an insulation treatment or an insulator is interposed. In a transformer formed by winding a predetermined number of turns in a band-shaped conductor at a fold to form a bent convex portion, and winding a predetermined number of turns in the axial direction so that the bent convex portions between respective turns overlap, A transformer characterized in that the bent protrusions of the strip-shaped conductor are arranged so as to be on the axial center side at both ends in the axial direction of the coil. 11. An iron core, a low-voltage coil placed around the iron core, and a high-voltage coil mounted around the low-voltage coil, wherein the low-voltage coil is subjected to an insulation treatment or an insulator is interposed. In a transformer formed by winding a predetermined number of turns in the axial direction so that axial end portions of the band-shaped conductor wound by a predetermined number of turns reach the inner-side insulator and the outer-side insulator, respectively. Is a transformer characterized in that at each of the coil axial ends, the cross-section outer diameter side end of the strip-shaped conductor is inclined so as to be on the axial center side as compared with the inner diameter side end. 12. An iron core, a low-voltage coil placed around the iron core, and a high-voltage coil mounted around the low-voltage coil, wherein the low-voltage coil is subjected to an insulation treatment or an insulator is interposed. A predetermined number of turns of the strip-shaped conductor are wound in the axial direction so that the end portions in the axial direction reach the insulator on the inner circumference side and the insulator on the outer circumference side, respectively. A transformer, wherein the cross sections of the strip-shaped conductors at both ends are inclined so as to be substantially parallel to the directions of the leakage magnetic fluxes at both ends in the coil axis direction generated between the low-voltage coil and the high-voltage coil. 13. After fitting the first end insulator to the insulating cylinder,
A band-shaped conductor wound with a prepreg tape is processed into a wavy shape, which is wound around the insulating cylinder, an intermediate insulator is provided when the band-shaped conductor is wound up to the axial center, and then the wavy convex portion of the band-shaped conductor is projected. And then winding up a predetermined number of times to attach the second end insulating material to the side opposite to the first end insulating material and then performing outer layer insulation, and then heating the whole while applying pressure from above and below. A method for manufacturing a coil winding, which is characterized in that it is formed by curing.