JP7479966B2 - Static induction motor - Google Patents

Description

An embodiment of the present invention relates to a static induction device.

A static induction electric device such as a transformer or a reactor includes a static induction electric device body composed of a winding, an iron core, etc., and a container that houses the static induction electric device body. The container is filled with a cooling medium for insulation and cooling. In recent years, there are gas-insulated static induction electric devices that use a non-flammable insulating gas such as _SF6 as a cooling medium instead of the conventional insulating oil.
For example, it is difficult to house three-phase static induction devices for underground substations in one container due to restrictions imposed by the installation location and the route to the installation location, so it is common to house the devices for each phase in a separate container, a so-called special three-phase configuration.

A special three-phase gas-insulated static induction motor requires high gas pressure for insulation and cooling purposes, and is equipped with a cylindrical container that can withstand the gas pressure. An iron core and windings are housed inside the container. The size of the container is determined by the size of the iron core. The iron core has side legs that extend parallel to the axial direction along the central axis of the container. The side legs have a rectangular cross-sectional shape when viewed from the axial direction. In this case, there is a large surplus space between the inner surface of the cylindrical container and the side legs with rectangular cross-sections. There is a demand for a static induction motor that can reduce the surplus space and be made smaller.

Japanese Patent Application Laid-Open No. 7-161538 Japanese Patent Application Laid-Open No. 2-181407

The problem that this invention aims to solve is to provide a stationary induction device that can be made compact.

The stationary induction motor of the embodiment has a container and an iron core. The container has a cylindrical shape. The iron core is housed in the container. The iron core includes one main leg and two side legs. The main leg has a circular cross-sectional shape when viewed from the axial direction of the container. A winding is wound around the main leg. The side leg has an outer shape in which a corner facing the inner peripheral surface of the container when viewed from the axial direction is cut off, and has a cross-sectional shape that is convex with respect to the inner peripheral surface of the container . The side legs are arranged outside the winding.

FIG. 2 is a front view of the stationary induction motor according to the first embodiment. FIG. 2 is a diagram showing the internal configuration of the stationary induction motor of the first embodiment as viewed from the axial direction. FIG. 2 is a perspective view of an iron core according to the first embodiment. FIG. 4 is a cross-sectional view of the side leg of the first embodiment as viewed from the axial direction. FIG. 4 is an explanatory diagram of a cross-sectional shape of a side leg according to the first embodiment. FIG. 11 is a cross-sectional view of a side leg of a second embodiment as viewed from the axial direction. FIG. 11 is a cross-sectional view of a side leg of a third embodiment as viewed from the axial direction. FIG. 13 is a front view of the stationary induction motor according to the fourth embodiment. FIG. 13 is a cross-sectional view of a connecting portion of the lower flange according to the fourth embodiment.

Hereinafter, a static induction motor according to an embodiment will be described with reference to the drawings.
First, the first embodiment will be described with reference to FIG. 1 to FIG.
1 is a front view of a static induction device 1 according to a first embodiment. For example, the static induction device 1 is a gas-insulated static induction device having a special three-phase configuration. For example, the static induction device 1 is a shunt reactor.
1, the stationary induction electric device 1 includes a stationary induction electric device body 2 and a container 3. The stationary induction electric device body 2 includes an iron core 4 and a winding 5. The container 3 houses the stationary induction electric device body 2. For example, the container 3 is filled with a non-flammable insulating gas (not shown) such as _SF6 .

The container 3 will now be described.
The container 3 is a tank for one phase of a special three-phase gas-insulated stationary induction electric device. The container 3 has a cylindrical shape. Hereinafter, the direction along the central axis CL of the container 3 is referred to as the "axial direction", the direction perpendicular to the central axis CL is referred to as the "radial direction", and the direction around the central axis CL is referred to as the "circumferential direction". The axial direction is the direction along the up-down direction. Hereinafter, the direction V1 parallel to the axial direction is referred to as the "first direction V1", the direction V2 perpendicular to the first direction V1 is referred to as the "second direction V2", and the direction V3 perpendicular to each of the first direction V1 and the second direction V2 is referred to as the "third direction V3".

For example, the vessel 3 is formed of a metal such as stainless steel, etc. The vessel 3 includes an upper vessel 10 and a lower vessel 20.
The upper casing 10 constitutes an upper part of the casing 3. The lower casing 20 constitutes a lower part of the casing 3. The lower casing 20 has an accommodation space 19 that accommodates the iron core 4 and the windings 5. The lower casing 20 includes a side plate 21, a bottom plate 22, and a lower flange 23 (flange).

The side plate 21 extends in the up-down direction and has an annular shape when viewed in the up-down direction (see FIG. 2 ).
Fig. 2 is a view of the internal configuration of the stationary induction electric appliance 1 of the first embodiment as viewed from the axial direction. Fig. 2 corresponds to a view of the stationary induction electric appliance 1 as viewed from above with the upper container 10 removed. As shown in Fig. 2, the side plate 21 has an inner circumferential circle 24 and an outer circumferential circle 25 as viewed from the top-bottom direction. The inner circumferential circle 24 is a circle on the radially inner side of the side plate 21 as viewed from the top-bottom direction. The outer circumferential circle 25 is a circle on the radially outer side of the side plate 21 as viewed from the top-bottom direction.

As shown in FIG. 1, the bottom plate 22 is connected to the lower end of the side plate 21. When viewed from the top-bottom direction, the bottom plate 22 has a circular shape concentric with the side plate 21. When viewed from the top-bottom direction, the bottom plate 22 has the same diameter as the outer circumferential circle 25 of the side plate 21. The stationary induction electric device body 2 is fixed onto the bottom plate 22.

The lower flange 23 is connected to the upper end of the side plate 21. As shown in FIG. 2, the lower flange 23 has a circular ring shape concentric with the side plate 21 when viewed from the top-bottom direction. The lower flange 23 protrudes radially outward from the upper end of the side plate 21. When viewed from the top-bottom direction, the lower flange 23 has an inner diameter equal to the inner circumferential circle 24 of the side plate 21 and an outer diameter larger than the outer circumferential circle 25 of the side plate 21. The lower flange 23 has a through hole 26 (hereinafter referred to as the "lower through hole 26") that opens in the top-bottom direction. The lower through hole 26 has a size that allows the shaft portion of the bolt 15 (see FIG. 1) to pass through. A plurality of lower through holes 26 are arranged at intervals in the circumferential direction of the lower flange 23.

As shown in FIG. 1 , the upper vessel 10 includes a top plate 11 (end plate) and an upper flange 12 .
The top plate 11 has a dome shape that is convex upward. The top plate 11 has a circular shape that is concentric with the bottom plate 22 when viewed from the top-bottom direction.
The upper flange 12 is connected to the lower end of the top plate 11. When viewed from the top-bottom direction, the upper flange 12 has an annular shape concentric with the lower flange 23. When viewed from the top-bottom direction, the upper flange 12 has the same inner diameter as the lower flange 23 and the same outer diameter as the lower flange 23. The upper flange 12 has a through hole (hereinafter referred to as "upper through hole 13") that opens in the top-bottom direction. The upper through hole 13 has a size that allows the shaft portion of the bolt 15 to pass through. A plurality of upper through holes 13 are arranged at intervals in the circumferential direction of the upper flange 12. A plurality of upper through holes 13 are arranged at the same intervals as the lower through holes 26.

The upper flange 12 is connected to the lower flange 23 via a sealing member such as an O-ring (not shown). For example, first, the upper flange 12 is opposed to the lower flange 23 via a sealing member (not shown). At this time, the upper flange 12 is overlapped with the lower flange 23 when viewed from the top-bottom direction, and the upper through-hole 13 and the lower through-hole 26 are communicated with each other. Next, the bolt 15 is inserted from above the upper flange 12 through the upper through-hole 13 and the lower through-hole 26, and the shaft portion of the bolt 15 is protruded below the lower flange 23. Next, the nut 16 is screwed onto the protruding shaft portion of the bolt 15. This allows the upper container 10 to be fastened to the lower container 20.

The iron core 4 will now be described.
FIG. 3 is a perspective view of the iron core 4 of the first embodiment.
As shown in Fig. 3, the iron core 4 is formed by stacking a plurality of electromagnetic steel plates in the third direction V3. As shown in Fig. 2, the iron core 4 has an outer shape in which both corners facing the inner peripheral surface of the container 3 when viewed from the top-bottom direction are cut off. In other words, the iron core 4 has an outer shape in which both corners in the third direction V3 of a portion facing the inner peripheral circle 24 of the side plate 21 in the second direction V2 are cut off. The iron core 4 includes a main leg 30, a side leg 31, and yokes 32A and 32B.

As shown in FIG. 1, the main leg 30 extends in the vertical direction (axial direction). The main leg 30 has a cylindrical shape along the vertical direction. When viewed from the vertical direction, the main leg 30 has a circular shape concentric with the side plate 21 (see FIG. 2). The winding 5 is wound around the main leg 30. When viewed from the vertical direction, the winding 5 has an annular shape concentric with the main leg 30 (see FIG. 2).

The side legs 31 extend in the vertical direction (first direction V1). A pair of side legs 31 are arranged on both sides of the main leg 30 and the winding 5 in the second direction V2. As shown in FIG. 2, the side legs 31 have an outer shape in which both corners that face the inner peripheral surface of the container 3 when viewed from the vertical direction are cut off.

4 is a cross-sectional view of the side leg 31 of the first embodiment as viewed from the axial direction, which corresponds to the cross section taken along line IV-IV in FIG.
As shown in FIG. 4, the surface of the side leg 31 facing the winding 5 in the second direction V2 is referred to as the "first surface 35", and the surface opposite the first surface 35 in the second direction V2 is referred to as the "second surface 36". The side leg 31 has a shape in which the first surface 35 is flat and the second surface 36 is convex toward the inner circumferential surface of the container 3 (the inner circumferential circle 24 of the side plate 21). The side leg 31 has a convex cross-sectional shape when viewed from the top-bottom direction. The cross-sectional shape of the side leg 31 means the shape of a cross section obtained by cutting the side leg 31 at a plane perpendicular to the central axis CL (see FIG. 1). The side leg 31 has the same convex cross-sectional shape throughout the entire direction in which the side leg 31 extends (the entire vertical direction).

Fig. 5 is an explanatory diagram of the cross-sectional shape of the side leg 31 of the first embodiment. Fig. 5 is a diagram for explaining the cross-sectional shape of the side leg 31 using a rectangular imaginary cross section. As shown in Fig. 5, the side leg 31 has a pair of rectangular notches 39 (voids) formed by cutting off both corners facing the inner peripheral surface of the container 3 in the rectangular imaginary cross section when viewed from the top and bottom.

Here, the length L1 of the notch 39 in the second direction V2 is the "first length L1", the length L2 of the notch 39 in the third direction V3 is the "second length L2", the total length X1 of the short side of the rectangular imaginary cross section is the "short side length X1", and the total length X2 of the long side of the rectangular imaginary cross section is the "long side length X2".
For example, from the viewpoint of not affecting the magnetic flux passing through the side leg 31, it is preferable to satisfy X1/5≦L1≦X1/3 and X2/5≦L2≦X2/3. In this embodiment, L1=X1/3 and L2=X2/3 are satisfied.

As shown in FIG. 3, the yokes 32A and 32B extend along the second direction V2 so as to connect both ends of the main leg 30 and the pair of side legs 31. The yokes 32A and 32B are arranged in pairs on both axial sides of the main leg 30 and the pair of side legs 31. When viewed from the second direction V2, the yokes 32A and 32B have the same cross-sectional shape as the side leg 31 (specifically, the cross-sectional shape of the side leg 31 when viewed from the first direction V1). The yokes 32A and 32B have the same convex cross-sectional shape as the side leg 31 throughout the entire direction in which the yokes 32A and 32B extend (the entire second direction V2).

Here, of the pair of yokes 32A, 32B, the yoke 32A connecting the upper ends of the main leg 30 and the pair of side legs 31 is referred to as the "upper yoke 32A", and the yoke 32B connecting the lower ends of the main leg 30 and the pair of side legs 31 is referred to as the "lower yoke 32B".
The upper yoke 32A has a cross-sectional shape that is convex upward over the entire direction in which the upper yoke 32A extends. The lower yoke 32B has a cross-sectional shape that is convex downward over the entire direction in which the lower yoke 32B extends. In other words, the yokes 32A and 32B have a convex shape that is convex toward the side opposite to the surface facing the winding 5 (see FIG. 1 ), and have the same convex cross-sectional shape as the side leg 31.

As described above, the stationary induction electric device 1 of the embodiment has a container 3 and an iron core 4. The container 3 has a cylindrical shape. The iron core 4 is housed in the container 3. The iron core 4 has an outer shape in which both corners facing the inner peripheral surface of the container 3 as viewed in the axial direction are cut off. The above configuration provides the following effects.
The inner diameter of the container 3 can be reduced by the amount of both corners of the iron core 4 cut off, and the excess space between the inner peripheral surface of the container 3 and the iron core 4 can be reduced. Therefore, the static induction machine 1 can be made smaller.

However, it is difficult to house three-phase static induction devices for underground substations in a single container due to restrictions imposed by the installation location and the route to the installation location. For this reason, it is common to house the devices for each phase in a separate container, a so-called special three-phase configuration. According to the embodiment, it is possible to make the gas-insulated static induction device with a special three-phase configuration smaller than the conventional configuration (where the side legs of the core have a rectangular cross-sectional shape when viewed from the axial direction). Therefore, it is possible to provide a gas-insulated static induction device that can be installed in underground substations with significant dimensional restrictions.

If the static induction device is a transformer with on-load tap changer, etc., the excess space can be reduced by storing multiple wires, including those for the tap windings, in the excess space. However, if the static induction device is a shunt reactor, etc., the excess space tends to be large because there are fewer windings and wires compared to a transformer with on-load tap changer, etc. According to the embodiment, even if the static induction device 1 is a shunt reactor, the excess space can be reduced by the above-mentioned configuration, which is of great practical benefit.

The yokes 32A, 32B have the same cross-sectional shape as the side leg 31 when viewed in the second direction V2, thereby providing the following effects.
The magnetic flux densities of the side legs 31 and the yokes 32A and 32B can be made the same, and local heat generation can be suppressed.

The side leg 31 has a convex cross-sectional shape when viewed in the axial direction, which provides the following effects.
By fitting the convex shape of the side legs 31 to the inner peripheral surface of the container 3, it is possible to increase the utilization efficiency of the volume inside the container 3 and reduce the inner diameter of the container 3. Therefore, it is possible to provide a more compact static induction device 1.

When the length of the notch 39 in the second direction V2 is L1, the length of the notch 39 in the third direction V3 is L2, the total length of the short sides of the rectangular imaginary cross section is X1, and the total length of the long sides of the rectangular imaginary cross section is X2, satisfying L1 = X1/3 and L2 = X2/3 provides the following effects.
It is possible to minimize the excess space between the inner circumferential surface of the container 3 and the side leg 31 while suppressing the influence on the magnetic flux passing through the side leg 31. Therefore, it is possible to provide a more compact static induction device 1 while maintaining the excitation characteristics of the iron core 4.

Next, a second embodiment will be described with reference to Fig. 6. In the second embodiment, the description of the same configuration as in the first embodiment will be omitted.
The side legs are not limited to having a convex cross-sectional shape when viewed in the axial direction. The second embodiment differs from the first embodiment in that the side legs have a semi-cylindrical cross-sectional shape when viewed in the axial direction.

FIG. 6 is a cross-sectional view of a side leg 231 of the second embodiment as viewed from the axial direction.
6, the side leg 231 has a shape in which the first surface 235 is a flat surface and the second surface 236 is a curved surface that is convex toward the inner peripheral surface of the container 3. The side leg 231 has a cross-sectional shape that is semi-cylindrical when viewed from the axial direction. The second surface 236 has a smaller radius of curvature than the inner peripheral surface of the container 3. Note that the second surface 236 may have a radius of curvature equal to or greater than that of the inner peripheral surface of the container 3.

According to the second embodiment, the side leg 231 has a semi-cylindrical cross-sectional shape when viewed in the axial direction, thereby achieving the following effects.
By arranging the second surface 236 (the arc-shaped curved surface) of the side leg 231 along the inner peripheral surface of the container 3, it is possible to increase the utilization efficiency of the volume inside the container 3 and reduce the inner diameter of the container 3. Therefore, it is possible to provide a more compact static induction device.

Next, a third embodiment will be described with reference to Fig. 7. In the third embodiment, the description of the same configuration as in the first embodiment will be omitted.
The side legs are not limited to having a convex cross-sectional shape when viewed in the axial direction. The third embodiment differs from the first embodiment in that the side legs have an arc-shaped rectangular cross-sectional shape when viewed in the axial direction.

FIG. 7 is a cross-sectional view of a side leg 331 of the third embodiment as viewed from the axial direction.
As shown in FIG. 7, the side leg 331 has a first surface 335 that is an arc-shaped curved surface that follows the outer shape of the winding 5, and a second surface 336 that is an arc-shaped curved surface that is convex toward the inner peripheral surface of the container 3. The side leg 331 has a third surface 337 that connects both ends of the first surface 335 and the second surface 336 and is a flat surface that follows the second direction V2. The side leg 331 has a cross-sectional shape of an arc-shaped strip when viewed from the axial direction. The first surface 335 and the second surface 336 have the same radius of curvature. The second surface 336 has a radius of curvature smaller than that of the inner peripheral surface of the container 3. The second surface 336 may have a radius of curvature equal to or greater than that of the inner peripheral surface of the container 3.

According to the third embodiment, the side legs 331 have a cross-sectional shape of an arc-shaped strip when viewed in the axial direction, thereby achieving the following effects.
By arranging the second surface 336 (the arc-shaped curved surface) of the side leg 331 along the inner peripheral surface of the container 3, it is possible to increase the utilization efficiency of the volume inside the container 3 and reduce the inner diameter of the container 3. Therefore, it is possible to provide a more compact static induction device.

Next, a fourth embodiment will be described with reference to Figures 8 and 9. In the fourth embodiment, the description of the same configuration as in the first embodiment will be omitted.
The lower flange is not limited to protruding radially outward from the upper end of the side plate 21 (being an outward flange). The fourth embodiment differs from the first embodiment in that the lower flange protrudes radially inward from the upper end of the side plate 21 (being an inward flange).

FIG. 8 is a front view of a stationary induction motor 401 according to the fourth embodiment.
As shown in Fig. 8, the lower flange 423 is connected to the upper end of the side plate 21. When viewed from the top-bottom direction, the lower flange 423 has an annular shape concentric with the side plate 21. The lower flange 423 protrudes radially inward from the upper end of the side plate 21. When viewed from the top-bottom direction, the lower flange 423 has an outer diameter that is the same as the outer circumferential circle 25 of the side plate 21 and an inner diameter that is smaller than the inner circumferential circle 24 of the side plate 21. The lower flange 423 of the fourth embodiment has an annular shape that is smaller than the lower flange 23 of the first embodiment (see Fig. 1).

9 is a cross-sectional view of the connecting portion of the lower flange 423 in the fourth embodiment.
9, the lower flange 423 has an upwardly opening female thread 426. The female thread 426 has a size that allows the shaft portion of the bolt 415 to be screwed thereinto. A plurality of female threads 426 are arranged at intervals in the circumferential direction of the lower flange 423.

8, the upper container 10 includes a top plate 11 and an upper flange 412. The upper container 10 has a circular shape with the same diameter as the outer circumferential circle 25 of the side plate 21 when viewed in the up-down direction.
The upper flange 412 is connected to the lower end of the top plate 11. The upper flange 412 has an annular shape concentric with the lower flange 423 when viewed from the top-bottom direction. The upper flange 412 has the same inner diameter as the lower flange 423 and the same outer diameter as the lower flange 423 when viewed from the top-bottom direction. The upper flange 412 of the fourth embodiment has an annular shape smaller than the upper flange 12 of the first embodiment (see FIG. 1 ).

As shown in FIG. 9, the upper flange 412 has through holes 413 that open in the vertical direction. The through holes 413 are large enough to allow the shafts of the bolts 415 to pass through. A plurality of through holes 413 are arranged at intervals in the circumferential direction of the upper flange 412. A plurality of through holes 413 are arranged at the same intervals as the female threads 426.

The upper flange 412 is connected to the lower flange 423 via a sealing member such as an O-ring (not shown). For example, first, the upper flange 412 is opposed to the lower flange 423 via a sealing member (not shown). At this time, the upper flange 412 is overlapped with the lower flange 423 when viewed from the top-bottom direction, and the through-hole 413 and the female thread 426 are communicated with each other. Next, the bolt 415 is inserted into the through-hole 413 from above the upper flange 412, and the shaft of the bolt 415 is screwed into the female thread 426 of the lower flange 423. This allows the upper container 10 to be fastened to the lower container 20.

As shown in FIG. 8 , the container 3 includes a partition plate 440 that divides the storage space 419 into two vertically, and a connection flange 450 (joint) for joining the partition plate 440 to the inner surface of the side plate 21.
The accommodation space 419 is divided into an upper space 419A and a lower space 419B by a partition plate 440. A large part of the stationary induction electric device body 2 (a part other than the lower yoke 32B) is mainly accommodated in the upper space 419A. The lower space 419B mainly accommodates the lower yoke 32B.

The partition plate 440 is disposed between the upper yoke 32A and the lower yoke 32B. The partition plate 440 is disposed closer to the lower yoke 32B than to the upper yoke 32A. When viewed from the top-bottom direction, the partition plate 440 has an annular shape concentric with the side plate 21. When viewed from the top-bottom direction, the partition plate 440 has the same outer diameter as the inner circumferential circle 24 of the side plate 21 and the same inner diameter as the outer diameter of the winding 5.

The partition plate 440 has a through hole (not shown) for inserting the side leg 31 of the core 4, and a through hole 441 (hereinafter referred to as the "first bolt hole 441") for inserting the shaft portion of the bolt 445. The first bolt hole 441 has a size that allows the shaft portion of the bolt 445 to pass through. A plurality of first bolt holes 441 are arranged at intervals in the circumferential direction of the partition plate 440.

The connection flange 450 is disposed between the partition plate 440 and the lower yoke 32B. The connection flange 450 is disposed radially outward from the side leg 31. The connection flange 450 protrudes radially inward from the inner peripheral surface of the side plate 21. When viewed from the top-bottom direction, the connection flange 450 has an annular shape concentric with the side plate 21. The connection flange 450 is provided directly below the lower flange 423. When viewed from the top-bottom direction, the connection flange 450 is provided so as to fit within the radial width of the lower flange 423.

The connection flange 450 has a through hole 451 (hereinafter referred to as the "second bolt hole 451") for inserting the shaft portion of the bolt 445. The second bolt hole 451 has a size that allows the shaft portion of the bolt 445 to pass through. The second bolt holes 451 are arranged at intervals in the circumferential direction of the connection flange 450. The second bolt holes 451 are arranged at the same intervals as the first bolt holes 441.

The partition plate 440 is connected to the connection flange 450 by a plurality of bolts 445. For example, first, the partition plate 440 is installed on the connection flange 450. At this time, when viewed from the top-bottom direction, the partition plate 440 is overlapped on the connection flange 450, and the first bolt hole 441 and the second bolt hole 451 are communicated with each other. Next, the bolt 445 is inserted from above the partition plate 440 through the first bolt hole 441 and the second bolt hole 451, and the shaft portion of the bolt 445 is protruded below the connection flange 450. Next, the nut 446 is screwed onto the shaft portion of the protruding bolt 445. This allows the partition plate 440 to be fastened to the connection flange 450.

According to the fourth embodiment, the lower flange 423 protrudes radially inward from the upper end of the side plate 21. When viewed from the top-bottom direction, the lower flange 423 has an outer diameter equal to that of the outer circumferential circle 25 of the side plate 21, and an inner diameter smaller than that of the inner circumferential circle 24 of the side plate 21. When viewed from the top-bottom direction, the upper container 10 has a circular shape with the same diameter as that of the outer circumferential circle 25 of the side plate 21. The above-mentioned configuration provides the following effects.
In comparison with a case in which the lower flange protrudes radially outward from the upper end of the side plate 21, the stationary induction motor 401 can be made smaller.
In addition, it is possible to effectively utilize the space immediately below the lower flange 423. For example, wiring, shielding, and the like (not shown) can be disposed in the space immediately below the lower flange 423.

The container 3 has the partition plate 440 that divides the storage space 419 into two vertically, thereby achieving the following effects.
In order to cool the iron core 4 and the windings 5 (most part of the stationary induction body 2), which are heating elements, pressurized gas can be forcibly circulated in the space (in the upper space 419A) partitioned by the partition plate 440. For example, the cooling gas can be made to flow from the bottom to the top of the container 3 through a communication hole (not shown) provided in the stationary induction body 2.

The connection flange 450 is provided directly below the lower flange 423, thereby providing the following effects.
The space directly below the lower flange 423 can be effectively utilized as a space for arranging the connection flange 450. Therefore, the utilization efficiency of the volume inside the container 3 can be further improved.

Next, a modification of the embodiment will be described.
The iron core 4 of the embodiment has an outer shape in which both corners facing the inner peripheral surface of the container 3 as viewed in the axial direction are cut off. In contrast, the iron core 4 may have an outer shape in which only one corner facing the inner peripheral surface of the container 3 as viewed in the axial direction is cut off. In other words, it is sufficient for the iron core 4 to have an outer shape in which at least one of both corners facing the inner peripheral surface of the container 3 as viewed in the axial direction is cut off. For example, the shape of the portion of the iron core 4 facing the inner peripheral surface of the container 3 can be changed according to the required specifications.

The iron core 4 of the embodiment includes a main leg 30, a pair of side legs 31, and a pair of yokes 32A and 32B. In contrast, the iron core 4 does not have to include the main leg 30. For example, the iron core 4 may include a pair of side legs 31 around which the winding 5 is wound, and a pair of yokes 32A and 32B. For example, the configuration of the iron core 4 can be changed according to the required specifications.

In the embodiment, the yokes 32A and 32B have the same cross-sectional shape as the side leg 31 when viewed from the second direction V2. In contrast, the yokes 32A and 32B may have a cross-sectional shape different from that of the side leg 31 when viewed from the second direction V2. For example, the cross-sectional shapes of the yokes 32A and 32B can be changed according to the required specifications.

The container 3 in the embodiment has a cylindrical shape extending in the vertical direction. In contrast, the container 3 may have a cylindrical shape extending in a direction intersecting the vertical direction (e.g., the horizontal direction). For example, the shape of the container 3 can be changed according to the required specifications.

The static induction device 1 in the embodiment is a shunt reactor. In contrast, the static induction device 1 may be a transformer with an on-load tap changer. For example, the configuration of the static induction device 1 can be changed according to the required specifications.

According to at least one of the embodiments described above, the inner diameter of the container 3 can be reduced by the amount of the corners of the iron core 4 that are cut off, and the excess space between the inner surface of the container 3 and the iron core 4 can be reduced. Therefore, the static induction device 1 can be made smaller.

Although several 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 embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the gist of the invention. These embodiments and their modifications are within the scope of the invention and its equivalents as set forth in the claims, as well as the scope and gist of the invention.

1...static induction device, 3...container, 4...iron core, 5...winding, 10...upper container, 19...accommodation space, 20...lower container, 21...side plate, 22...bottom plate, 23...lower flange (flange), 24...inner circumference, 25...outer circumference, 30...main leg, 31...side leg, 32A...upper yoke (yoke), 32B...lower yoke (yoke), 35...first surface, 36...second surface, 231...side leg, 235...first surface, 236...second surface, 331...side leg, 335...first surface, 336...second surface, 337...third surface, 401...static induction device, 419...accommodation space, 423...lower flange (flange), 440...partition plate, 450...connection flange (joint), V1...first direction, V2...second direction

Claims (6)

A cylindrical container;
a main leg that is housed in the container, has a circular cross-sectional shape when viewed in the axial direction of the container, and has a winding wound thereon, and two side legs that have a convex cross-sectional shape with respect to the inner circumferential surface of the container, an outer shape obtained by cutting off corners that face the inner circumferential surface of the container when viewed in the axial direction, and are arranged outside the winding . The stationary induction motor according to claim 1 , wherein the side legs have an outer shape in which both corners facing the inner peripheral surface of the container when viewed in the axial direction are cut off. The iron core is
The main leg extends along the axial direction;
a pair of side legs extending along a first direction parallel to the axial direction, arranged on both sides of the main leg and the winding in a second direction perpendicular to the first direction, and having an outer shape in which both corners facing the inner circumferential surface of the container as viewed from the axial direction are cut off;
The stationary induction motor according to claim 2 , further comprising: a pair of yokes extending along the second direction so as to connect both ends of the main leg and the pair of side legs, and having the same cross-sectional shape as the side legs when viewed from the second direction. 4. The stationary induction motor according to claim 3, wherein the side leg has a cross-sectional shape that is convex when viewed from the axial direction, with a first surface that faces the winding in the second direction being flat and a second surface that is opposite the first surface in the second direction being convex toward the inner peripheral surface of the container. The axial direction is a direction along the up-down direction,
The container comprises:
a lower container including: an annular side plate extending along the vertical direction and having an inner circumferential circle and an outer circumferential circle as viewed in the vertical direction; a circular bottom plate connected to a lower end of the side plate and having the same diameter as the outer circumferential circle of the side plate as viewed in the vertical direction; and an annular flange connected to an upper end of the side plate and having the same outer diameter as the outer circumferential circle of the side plate as viewed in the vertical direction and an inner diameter smaller than the inner circumferential circle of the side plate, the lower container having an accommodation space for accommodating the iron core and the windings;
The stationary induction electric device according to claim 1 , further comprising: an upper container connected to an upper end of the lower container via the flange and having a circular shape with the same diameter as the outer circumferential circle of the side plate when viewed from the vertical direction. The container comprises:
A partition plate that divides the storage space into two in the vertical direction;
The stationary induction device according to claim 5 , further comprising: a joint portion provided immediately below the flange for joining the partition plate and an inner peripheral surface of the side plate.

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