JP6990554B2 - Static guidance device - Google Patents

Description

Embodiments of the present invention relate to stationary induction devices.

In a stationary induction device equipped with an iron core and a coil wound around an iron core leg and arranged, the leakage flux leaking from the coil or the like diffuses to the outside and migrates to a nearby member, which causes an eddy current. Heat generation and the like occur, and power loss occurs.

Japanese Unexamined Patent Publication No. 2013-93635

The embodiment has been made in view of the above problems, and provides a stationary induction device capable of reducing the diffusion of the leakage flux to the outside.

The stationary guidance device according to the embodiment is arranged on a pair of iron core legs, a window portion inside, and an iron core having a ring-shaped or tubular structure as a whole, and a pair of the iron core legs, respectively. A pair of coils composed of an inner winding and an outer winding, the inner winding and the outer winding, and a position where the pair of coils face each other when the extension direction of the iron core leg is the vertical direction. It is located above or below the coil and is arranged so as to cover the upper or lower portion of the window portion of the adjacent pair of the coils and to cover the upper side and the lower side of the adjacent pair of the coils in common. A first shield and a second shield located above or below the coil outside the window and arranged so as to commonly cover the upper or lower parts of the pair of adjacent coils. Be prepared.
The first shield is formed by stacking a plurality of thin plate square pillar-shaped unit magnetic members in the thickness direction to form a flat plate square pillar shape as a whole. Further, the first shield has a flat plate ring shape having a window portion in the center thereof, and is formed by winding a thin flat plate band-shaped magnetic material around the window portion and molding the first shield into a ring shape.

A perspective view schematically showing a schematic configuration of a transformer according to the first embodiment. A vertical cross-sectional view schematically showing a schematic configuration of a transformer cross section taken along the line AA of FIG. Top view schematically showing the schematic configuration of a transformer Perspective view schematically showing the schematic configuration of the iron core Perspective view schematically showing the schematic configuration of the first shield Perspective view schematically showing the schematic configuration of the second shield Top view schematically showing the schematic configuration of the transformer according to the second embodiment. Perspective view schematically showing the schematic configuration of the third shield

Hereinafter, embodiments will be described with reference to the drawings. In the description of the embodiment, substantially the same components are designated by the same reference numerals, and the description thereof will be omitted. In FIG. 1, the direction in which the leg portion 10c of the iron core 10 is extended, that is, the axial direction is defined as the vertical direction, and the direction in which the coil 11 and the coil 12 are arranged is described as the left-right direction. Also in other figures, the directions corresponding to the directions in FIG. 1 will be described as the vertical direction and the horizontal direction.

(First Embodiment)
The transformer 1 according to the first embodiment will be described with reference to FIGS. 1 to 6. 1 to 6 are diagrams showing a schematic configuration example of a transformer 1 as an example of a stationary induction device according to a first embodiment. FIG. 1 is a perspective view schematically showing a schematic configuration of a transformer 1, FIG. 2 is a vertical sectional view schematically showing a schematic configuration of the transformer 1 in the line AA of FIG. 1, and FIG. 3 is a vertical sectional view of the transformer 1. It is a top view which shows the schematic structure schematically. FIG. 1 mainly shows the iron core 10 and the coils 11 and 12. In FIG. 2, a clamp 18 or the like that does not actually appear in the cross section is shown by a two-dot chain line. In FIG. 3, the iron core 10 is omitted. FIG. 4 is a perspective view schematically showing a schematic configuration of the iron core 10. FIG. 5 is a perspective view schematically showing a schematic configuration of the first shield 14. FIG. 6 is a perspective view schematically showing a schematic configuration of the second shield 16.

As shown in the figure, the transformer 1 includes an iron core 10 and coils 11 and 12 wound around the outer periphery of the leg portion 10c of the iron core 10 and mounted. The coil 11 and the coil 12 are a pair of coils, for example, the coil 11 is a primary coil and the coil 12 is a secondary coil. When the transformer 1 is in operation, an alternating current is passed through the coil 11 which is the primary coil to generate a fluctuating magnetic field, which is transmitted to the coil 12 which is the secondary coil coupled by the mutual inductance of the iron core 10 and converted into a current again. Is output.

The iron core 10 has, for example, a rectangle having rounded corners, and is configured to include two long sides and short sides. The long side portion is a leg portion 10c, and the short side portion is an upper yoke 10a and a lower yoke 10b. The iron core 10 has a ring-shaped or cylindrical structure having a window portion 10d inside. Although FIG. 1 or FIG. 4 shows that the iron core 10 is integrally configured, the iron core 10 is actually configured by arranging a plurality of unit cores in parallel in the width direction. ing. The unit iron core is composed of a plurality of iron core materials wound around and has a window portion in the center, and is composed of, for example, a plurality of metal thin plates made of a silicon steel plate as a material. The iron core 10 is cut into upper and lower halves at the long side portion, and each has a substantially U-shape. The substantially U-shaped iron core 10 includes a leg portion 10c, and the leg portion 10c constitutes the iron core 10 by abutting the cut surfaces facing each other from above and below.

As shown in FIG. 2, the iron core 10 is clamped and fixed by clamps 18 in the upper yoke 10a and the lower yoke 10b. The clamp 18 functions as a tightening metal fitting for tightening and fixing the iron core 10. The coil 12 is fixed by the coil retainer 20 from above and below. The coil retainer 20 is made of an insulating material. The transformer 1 configured in this way is housed in a tank (not shown) filled with an insulating cooling medium such as insulating oil or insulating gas.

The coil 11 includes an inner winding 11a wound cylindrically around the outer circumference of the leg portion 10c of the iron core 10 and an outer winding 11b wound cylindrically around the outer circumference of the inner winding 11a. A gap 11c having a predetermined dimension is provided between the inner winding 11a and the outer winding 11b. The inner winding 11a is used as a low pressure coil, for example, and the outer winding 11b is used as a high pressure coil, for example.

The gap 11c is composed of, for example, a spacer (not shown) arranged between the inner winding 11a and the outer winding 11b. The gap 11c functions as a path through which the cooling medium that cools the coil 11 passes, for example, by passing through insulating oil, that is, cooling oil. When the transformer 1 is driven, a magnetic flux is generated in the gap 11c.

The coil 12 includes an inner winding 12a wound cylindrically around the outer circumference of the leg portion 10c of the iron core 10 and an outer winding 12b wound cylindrically around the outer circumference of the inner winding 12a. A gap 12c having a predetermined dimension is provided between the inner winding 12a and the outer winding 12b. The inner winding 12a is used as a low pressure coil, for example, and the outer winding 12b is used as a high pressure coil, for example.

The gap 12c is composed of, for example, a spacer (not shown) arranged between the inner winding 12a and the outer winding 12b. The gap 12c functions as a path through which the cooling medium that cools the coil 12 passes, for example, by passing through insulating oil, that is, cooling oil. When the transformer 1 is driven, a magnetic flux is generated in the gap 12c.

The coil 11 and the coil 12 are arranged on the leg portion 10c of the iron core 10 and function as a primary coil and a secondary coil which are a pair of coils of the transformer 1. A magnetic flux is also generated in the gap 12c of the coil 12 as in the gap 11c. When the transformer 1 is driven, the directions of the magnetic flux passing through the gap 11c and the direction of the magnetic flux passing through the gap 12c are opposite. For example, as shown in FIG. 3, when the coil 11 is a primary coil and an upward magnetic flux is generated in the gap 11c, a downward magnetic flux is generated in the gap 12c of the coil 12 which is a secondary coil. do.

A first shield 14 and a second shield 16 are arranged above and below the coil 12. The first shield 14 and the second shield 16 are fixed to, for example, the coil retainer 20 and are arranged so as not to come into contact with the iron core 10 and the coil 12. The first shield 14 and the second shield 16 are arranged so that the distance from the coil 12 is as small as possible. The first shield 14 and the second shield 16 are arranged so as to cover at least the upper part and the lower part of the gaps 11c and 12c, one at the upper part and the lower part of the gaps 11c and 12c.

As shown in FIG. 5, the first shield 14 has a flat plate square pillar shape as a whole. The first shield 14 is formed by stacking a plurality of unit magnetic members 14a made of a thin plate square pillar-shaped magnetic material having an insulating coating on the surface in the thickness direction. The unit magnetic member 14a has a longitudinal direction, and the first shield 14 is configured such that the longitudinal direction of the unit magnetic member 14a is directed in the same direction and the unit magnetic member 14a is oriented in the left-right direction in FIG. The first shield 14, that is, the unit magnetic member 14a is made of, for example, a silicon steel plate, and the thickness of the silicon steel plate is formed as thin as possible.

As shown in FIGS. 1 to 3, the first shield 14 is located in the window portion 10d of the iron core 10, and is above and below the pair of adjacent coils 11 and 12, more specifically, the window portion 10d. It is arranged so as to commonly straddle and cover the upper side and the lower side of the gap 11c of the coil 11 and the gap 12c of the coil 12 inside. That is, the first shield 14 is arranged so that the pair of adjacent coils 11 and 12 commonly straddle and cover the upper portions and the lower portions on the opposite sides. At this time, the longitudinal direction of the unit magnetic member 14a of the first shield 14 is arranged so that the coil 11 and the coil 12 are arranged adjacent to each other, that is, in the left-right direction in the drawing.

As shown in FIG. 6, the second shield 16 has a window portion 16a at the center thereof and has a flat plate ring shape as a whole. For example, a flat plate band-shaped band member 16b is provided around the window portion 16a. It is configured by winding and molding. The band member 16b is made of a magnetic material whose surface is coated with insulation. The band member 16b constituting the second shield 16 is made of, for example, a silicon steel plate, and is formed so as to be as thin as possible.

As shown in FIGS. 1 to 3, the second shield 16 and the band member 16b constituting the second shield 16 are outside the window portion 10d of the iron core 10, and are above and below the pair of adjacent coils 11 and 12 and below each other. More specifically, the coils 11 outside the window portion 10d are arranged so as to commonly straddle and cover the upper and lower portions of the gap 11c of the coil 11 and the gap 12c of the coil 12. At this time, the second shield 16 is arranged so as to surround the circumference of the iron core 10 above or below the coil 11 and the coil 12, and above the gap 11c and the gap 12c of the pair of adjacent coils 11 and the coil 12. They are arranged so as to cover each other or the lower parts in common.

The transformer 1 configured as described above has the following effects. In the following description, the magnetic flux generated in the gap 11c inside the window portion 10d of the coil 11 is referred to as 22a, and the magnetic flux generated in the gap 11c outside the window portion 10d of the coil 11 is referred to as the magnetic flux 22b. Further, the magnetic flux generated in the gap 12c inside the window portion 10d of the coil 12 is defined as 24a, and the magnetic flux generated in the gap 12c outside the window portion 10d of the coil 12 is defined as the magnetic flux 24b. Further, the magnetic fluxes 22a and 22b are collectively referred to as a magnetic flux 22, and the magnetic fluxes 24a and 22b are collectively referred to as a magnetic flux 24. Further, the magnetic flux flowing in the first shield 14 is referred to as a magnetic flux 26, and the magnetic flux flowing in the second shield 16 is referred to as a magnetic flux 28.

According to the transformer 1 according to the above configuration, the pair of iron cores 10 include a leg portion 10c and a window portion 10d inside. Further, the transformer 1 includes a pair of coils 11 and 12, and the pair of coils 11 and 12 are arranged on the legs 10c of the pair of iron cores 10. The pair of coils 11 and 12 each consist of an inner winding 11a and an outer winding 11b, an inner winding 12a and an outer winding 12b, and is between the inner winding 11a or 12a and the outer winding 11b or 12b. Is provided with a gap 11c or 12c. The transformer 1 further includes a first shield 14 and a second shield 16. The first shield 14 is a position above and below the position where the pair of coils 11 and 12 face each other when the extension direction of the leg portion 10c of the iron core 10 is the vertical direction, and the first shield 14 is a position above and below the position where the pair of coils 11 and 12 face each other. It is arranged so as to cover the upper or lower side of the gap 11c and 12c in the window portion 10d of the iron core 10 and to cover the upper side and the lower side of the gap 11c and 12c of the pair of adjacent coils 11 and 12 in common. The second shield 16 is located at the upper and lower positions of the coils 11 and 12 outside the window portion 10d of the iron core 10, and commonly covers the upper portions or the lower portions of the gaps 11c and 12c of the pair of adjacent coils 11 and 12. Arranged like this. The first shield 14 and the second shield 16 are arranged so that the distance from the coil 12 is as small as possible. The first shield 14 and the second shield 16 are arranged so as to cover at least the upper part and the lower part of the gaps 11c and 12c, one at the upper part and the lower part of the gaps 11c and 12c.

Further, the first shield 14 is formed by stacking a plurality of thin plate quadrangular prism-shaped unit magnetic members 14a whose surface is coated with insulation in the thickness direction to form a flat plate quadrangular prism shape as a whole. There is. The longitudinal direction of the unit magnetic member 14a of the first shield 14 is arranged so that the pair of coils 11 and 12 are arranged adjacent to each other. Further, here, the thickness of the unit magnetic member 14a is formed as thin as possible.

With this configuration, when the magnetic flux 22 generated in the gap 11c of one of the pair of coils 11 and 12 is in the upward direction as shown in FIG. 3, the other of the pair of coils 11 and 12 is operated. The magnetic flux 24 of the coil 12 is in the downward direction as shown in FIG.

At this time, the magnetic flux 22a travels upward through the gap 11c, protrudes upward from the upper end of the gap 11c, and is taken into the first shield 14 arranged so as to cover the upper part of the gap 11c. The magnetic flux entering the first shield 14 (hereinafter referred to as magnetic flux 26) is guided in the stretching direction of the unit magnetic member 14a of the first shield 14 in FIG. 3, that is, from the coil 11 in the coil 12 direction, that is, in the left direction in the figure. Proceed to reach the end of the 14th shield. The magnetic flux 26 that has reached the first shield 14 protrudes downward from the end of the first shield 14 and moves into the gap 12c. Since the magnetic flux in the gap 12c points downward, the magnetic flux transferred to the gap 12c merges with the magnetic flux 24b and proceeds downward. The magnetic flux 24b that has entered the gap 12c reaches the lower end of the gap 12c, then protrudes downward from the lower side of the gap 12c and is taken into the first shield 14 arranged so as to cover the lower side of the gap 12c. The magnetic flux, that is, the magnetic flux 26 transferred to the first shield 14, is guided from the extension direction of the unit magnetic member 14a of the first shield 14, that is, the coil 12 to the coil 11 direction, that is, to the right in the figure, and advances to the coil 11 of the first shield 14. It reaches the side end, the right end in the figure. After that, the magnetic flux 26 protrudes upward from the end of the first shield 14 and moves into the gap 11c. After that, by repeating this, the magnetic fluxes 22b and 24b generated in the gaps 11c and 12c of the coils 11 and 12 can be circulated in a loop between the gaps 11c and the gaps 12c.

Further, in the magnetic flux 22b of the gap 11c outside the window portion 10d of the coil 11 and the magnetic flux 24b of the gap 12c outside the window portion 10d of the coil 12, the magnetic flux behaves as follows. That is, when the magnetic flux 22 generated in the gap 11c of one of the pair of coils 11 and 12 is in the upward direction as shown in FIG. 3, the other coil is used during the operation of the transformer 1. The magnetic flux 24 of 12 is in the downward direction as shown in FIG.

At this time, in the gap 11c on the opposite side of the coil 12, that is, the gap 11c outside the window portion 10d of the coil 11, the magnetic flux 22b advances upward through the gap 11c, protrudes upward from the upper end of the gap 11c, and covers the upper part of the gap 11c. It is taken into the second shield 16 arranged so as to be. The magnetic flux entering the second shield 16 (hereinafter referred to as the magnetic flux 28) is guided by the band member 16b of the second shield 16 in FIG. 3, and is inside the second shield 16 arranged in the circumferential direction around the iron core 10. And reaches above the opposite side of the coil 11 of the coil 12. The magnetic flux 26 protrudes downward from the second shield 16 and shifts to the gap 12c. Since the magnetic flux in the gap 12c points downward, the magnetic flux transferred to the gap 12c merges with the magnetic flux 24b and proceeds downward.

The magnetic flux 24b that has entered the gap 12c reaches the lower end of the gap 12c, then protrudes downward from the lower side of the gap 12c and is taken into the second shield 16 arranged so as to cover the lower side of the gap 12c. The magnetic flux transferred to the second shield 16, that is, the magnetic flux 26, is guided in the stretching direction of the band member 16b of the second shield 16, that is, in the right direction in the figure, and is on the coil 11 side of the second shield 16 and opposite to the coil 12. It reaches the right end in the side, that is, in the figure. After that, the magnetic flux 26 protrudes upward from the second shield 16 and shifts to the gap 11c. After that, by repeating this, the magnetic fluxes 22b and 24b generated in the gaps 11c and 12c of the coils 11 and 12 can be circulated in a loop between the gaps 11c and the gaps 12c.

By circulating and confining the magnetic flux in a loop shape in this way, it is possible to prevent the magnetic flux generated in the gap 11c and the gap 12c of the coils 11 and 12 from leaking to the outside and diffusing. That is, it is possible to reduce the diffusion of the leakage flux of the coils 11 and 12 to the outside.

Therefore, it is possible to prevent the magnetic flux from migrating to the magnetic material near the coil, for example, the mounting bracket of the iron core or other members in the transformer 1, and the leakage flux causes eddy current loss in the member near the coil. Can be reduced. Further, the first shield 14 and the second shield 16 are arranged so that the distance from the coil 12 is as small as possible, and are arranged so as to cover the upper and lower portions of the gaps 11c and 12c. With this configuration, the magnetic flux passing through the gaps 11c and 12c can be efficiently transferred to the first shield 14 and the second shield 16, so that the leakage flux from the coils 11 and 12 can be suppressed more reliably. can.

Further, since the thickness of the unit magnetic member 14a constituting the first shield 14 and the band member 16b constituting the second shield 16 is formed as thin as possible, the magnetic flux passes through the first shield 14 and the second shield 16. It is possible to reduce the loss caused by the eddy current generated at that time, that is, the eddy current loss.

Further, with the above configuration, it is possible to suppress the diffusion of the leakage flux in the transformer 1, especially when the transformer 1 is operated in the high frequency region, which is caused by the eddy current loss generated by the leakage flux. The effect of suppressing heat generation becomes even greater.

(Second Embodiment)
Next, the transformer 1 according to the second embodiment will be described with reference to the drawings. 7 and 8 are diagrams schematically showing a schematic configuration of the transformer 1 according to the second embodiment. In FIG. 7, the iron core 10 is omitted. The transformer 1 according to the second embodiment is different from the first embodiment in that the first shield 14 in the first embodiment is changed to a third shield 30 having a different structure from the first shield 14. Other configurations are the same as those of the first embodiment.

As shown in FIG. 8, the third shield 30 has the same configuration as the second shield 16 in the first embodiment. That is, as shown in FIG. 8, the third shield 30 has a window portion 30a in the center portion and has a flat plate ring shape as a whole. It is configured by winding and molding. The band member 30b is made of a magnetic material whose surface is coated with insulation. The band member 30b constituting the third shield 30 is made of, for example, a silicon steel plate, and is formed so as to be as thin as possible.

With this configuration, the magnetic flux 22a of the gap 11c in the window portion 10d of the coil 11 is taken into the third shield 30, and the band member 30b of the third shield 30 guides the circumference of the window portion 30a in the circumferential direction to the window portion 10d of the coil 12. It is configured to merge with the magnetic flux 24a of the inner gap 12c, proceed in the same manner on the lower side of the coil, and return to the original state. As a result, the magnetic fluxes 22b and 24b generated in the gaps 11c and 12c of the coils 11 and 12 can be circulated in a loop between the gaps 11c and the gaps 12c.

According to the transformer 1 according to the second embodiment, the same effect as the effect in the first embodiment can be obtained. Further, according to the transformer 1 according to the second embodiment, the insulating oil can pass through the window portion 30a provided in the center of the first shield 30, so that the cooling efficiency of the transformer 1 can be improved. can.

Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and variations thereof are included in the scope and gist of the invention, and are also included in the scope of the invention described in the claims and the equivalent scope thereof.

1 ... Transformer (static induction device), 10 ... Iron core, 10c ... Leg, 10d ... Window, 11 ... Coil, 11a ... Inner winding, 11b ... Outer winding, 11c ... Gap, 12 ... Coil, 12a ... Inner winding, 12b ... Outer winding, 12c ... Gap, 14 ... First shield, 14a ... Unit magnetic member, 16 ... Second shield, 16a ... Window, 16b, 30b ... Band member, 22b, 24a, 24b, 26, 28, 32 ... Magnetic flux, 30 ... 3rd shield (1st shield)

Claims (4)

An iron core having a pair of iron core legs and a window inside, and having a ring-shaped or cylindrical structure as a whole.
A pair of coils arranged on the pair of iron core legs, each consisting of an inner winding and an outer winding, and the inner winding and the outer winding.
When the extension direction of the iron core leg is the vertical direction, the position above or below the coil at the position where the pair of the coils face each other, and above or below the window portion of the pair of adjacent coils. A first shield that covers and is arranged so as to commonly cover the upper and lower parts of the pair of adjacent coils.
A second shield, which is located above or below the coil outside the window and is arranged so as to commonly cover the upper or lower parts of the pair of adjacent coils, is provided .
The first shield is a static induction device configured to form a flat plate square pillar shape as a whole by forming a plurality of thin plate square pillar-shaped unit magnetic members in a stack in the thickness direction . The stationary induction device according to claim 1 , wherein the unit magnetic member of the first shield is arranged so that the pair of coils are arranged adjacent to each other in the longitudinal direction. An iron core having a pair of iron core legs and a window inside, and having a ring-shaped or cylindrical structure as a whole.
A pair of coils arranged on the pair of iron core legs, each consisting of an inner winding and an outer winding, and the inner winding and the outer winding.
When the extension direction of the iron core leg is the vertical direction, the position above or below the coil at the position where the pair of the coils face each other, and above or below the window portion of the pair of adjacent coils. A first shield that covers and is arranged so as to commonly cover the upper and lower parts of the pair of adjacent coils.
A second shield, which is located above or below the coil outside the window and is arranged so as to commonly cover the upper or lower parts of the pair of adjacent coils, is provided.
The first shield is a flat plate ring shape having a window portion in a central portion, and is a stationary induction device formed by winding a thin flat plate strip-shaped magnetic material around the window portion and molding it into a ring shape . The second shield has a flat plate ring shape having a window portion in the center thereof, and is formed by winding a thin flat plate strip-shaped magnetic material around the window portion and molding the second shield into a ring shape. The stationary induction device according to any one of the above.

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