JP7651885B2 - Transformers - Google Patents

Description

The present invention relates to a transformer.

As transformers, three-leg core transformers including an iron core with three legs and five-leg core transformers including an iron core with five legs are known. Patent Document 1 discloses a three-phase three-leg core transformer. In a three-leg core transformer, windings (conductors) are wound around all three legs. Patent Document 2 discloses a three-phase five-leg core transformer. In a five-leg core transformer, for example, two return legs corresponding to the return path of the magnetic circuit are arranged on both sides of the three main legs around which windings are wound. In a five-leg core transformer, since return legs are arranged on both sides of the three main legs, the width is larger than that of a three-leg core transformer, but the height can be smaller than that of a three-leg core transformer. For example, in a five-leg core transformer, the height (thickness) of the yoke connecting the legs can be smaller than the height of the yoke of a three-leg core transformer.

JP 2017-208454 A JP 2002-025834 A

The iron core of the transformer is supported by a frame arranged below the iron core. In a conventional frame, when the gap between the frame and the winding is small, the frame height is smaller than when the gap between the frame and the winding is large, and the strength of the frame is reduced. The gap between the frame and the winding is smaller, for example, when the height of the yoke connecting the legs is small, than when the height of the yoke connecting the legs is large. Therefore, for example, in a transformer in which the height of the yoke connecting the legs is small, the frame strength may be insufficient if a frame of the same structure as a transformer in which the height of the yoke connecting the legs is large is used. In consideration of the above circumstances, the present invention aims to improve the strength of the frame that supports the iron core of the transformer.

A preferred embodiment of the transformer of the present invention includes an iron core including a plurality of legs extending in the direction of gravity, a first yoke portion connecting the lower ends of the plurality of legs, and a second yoke portion connecting the upper ends of the plurality of legs, a plurality of coils surrounding at least two of the plurality of legs, a frame supporting the iron core from below, and a plurality of coil support members supported by the frame and supporting the plurality of coils, the frame including a surface facing the bottom surface of the first yoke portion, a support portion extending in a first direction in which the plurality of legs are arranged and supporting the first yoke portion from below, two side portions arranged to sandwich the first yoke portion in a second direction perpendicular to both the direction of gravity and the first direction, each protruding upward from the support portion, and a seat portion protruding from a position between the upper edge and lower edge of each of the two side portions in a direction away from the first yoke portion, on which at least one of the plurality of coil support members is placed.

A transformer according to another preferred embodiment of the present invention comprises an iron core including a plurality of legs extending in the direction of gravity, a first yoke portion connecting the lower ends of the plurality of legs, and a second yoke portion connecting the upper ends of the plurality of legs, a plurality of coils surrounding at least two of the plurality of legs, a frame supporting the iron core from below, and a plurality of coil support members supported by the frame and receiving the plurality of coils, the frame including a surface facing the bottom surface of the first yoke portion, a support portion extending in a first direction which is the arrangement direction of the plurality of legs and supporting the first yoke portion from below, two side portions arranged to sandwich the first yoke portion in a second direction perpendicular to both the direction of gravity and the first direction, each protruding upward from the support portion, a seat portion protruding from the upper edge of each of the two side portions in a direction away from the first yoke portion and on which at least one of the plurality of coil support members is placed, and a first reinforcing portion protruding downward from the support portion and extending in the first direction.

The transformer of the present invention can improve the strength of the frame that supports the transformer's iron core.

FIG. 1 is a schematic diagram of a transformer according to a first embodiment. FIG. 2 is an explanatory diagram for explaining the iron core and the molded coil shown in FIG. 1 . 2 is a schematic diagram of the transformer shown in FIG. 1 as viewed from the +X direction. 2 is an explanatory diagram for explaining the effect of the first frame shown in FIG. 1; FIG. 11 is a schematic diagram of a transformer according to a second embodiment, viewed from the +X direction. FIG. 6 is a schematic diagram of the transformer shown in FIG. 5 as viewed from the +Z direction. FIG. 6 is a schematic diagram of the transformer shown in FIG. 5 as viewed from the −Y direction. FIG. 11 is a schematic diagram of a transformer according to a third embodiment, viewed from the +X direction. FIG. 11 is an explanatory diagram for explaining an example of a first frame according to a first modified example. FIG. 13 is an explanatory diagram for explaining another example of the first frame according to the first modified example. FIG. 13 is an explanatory diagram for explaining another example of the first frame according to the first modified example. FIG. 13 is an explanatory diagram for explaining another example of the first frame according to the first modified example. FIG. 13 is an explanatory diagram for explaining another example of the first frame according to the first modified example. FIG. 13 is an explanatory diagram for explaining another example of the first frame according to the first modified example. FIG. 13 is an explanatory diagram for explaining another example of the first frame according to the first modified example.

Below, the embodiments for carrying out the present invention will be described with reference to the drawings. However, in each drawing, the dimensions and scale of each part are appropriately different from the actual ones. In addition, the embodiments described below are preferred specific examples of the present invention, and therefore various technically preferable limitations are applied, but the scope of the present invention is not limited to these embodiments unless otherwise specified in the following description to the effect that the present invention is limited.

A. Embodiments Hereinafter, embodiments of the present invention will be described. First, an example of an outline of a transformer 10 according to a first embodiment will be described with reference to FIG.

A1: First Embodiment FIG. 1 is a schematic diagram of a transformer 10 according to a first embodiment.

For the sake of convenience, a three-axis Cartesian coordinate system having mutually orthogonal X, Y, and Z axes is introduced below. Hereinafter, the direction indicated by the X-axis arrow is referred to as the +X direction, and the opposite direction of the +X direction is referred to as the -X direction. Hereinafter, the direction indicated by the Y-axis arrow is referred to as the +Y direction, and the opposite direction of the +Y direction is referred to as the -Y direction. Hereinafter, the +Y direction and the -Y direction may be referred to as the Y direction without any particular distinction, and the +X direction and the -X direction may be referred to as the X direction without any particular distinction. Hereinafter, the +Z direction and the -Z direction may be referred to as the Z direction without any particular distinction. Hereinafter, the +Y direction may be referred to as the upward or upper side, and the -Y direction may be referred to as the downward or lower side. Hereinafter, the -Y direction corresponds to the "gravity direction". Additionally, the X direction is an example of a "first direction," and the Z direction is an example of a "second direction perpendicular to both the direction of gravity and the first direction." However, "perpendicular" does not only mean strictly perpendicular, but also includes substantially perpendicular (for example, perpendicular within a margin of error).

In the following, viewing an object from a specific direction may be referred to as a planar view. For example, Figure 1 shows a transformer 10 viewed from the +Z direction.

In this embodiment, it is assumed that the transformer 10 is a three-phase, five-legged iron core transformer. For example, the transformer 10 has an iron core 100, three molded coils 200, a plurality of first spacers 300, a plurality of second spacers 400, a first frame 500, a second frame 600, a third frame 700, and a fourth frame 800, and is installed on an installation stand 900. The iron core 100 is an example of an "iron core", and the three molded coils 200 are an example of "a plurality of coils". The plurality of first spacers 300 are an example of "a plurality of coil support members", and the first frame 500 is an example of a "frame".

Details of the iron core 100 and the molded coils 200 will be described later in FIG. 2, but for example, the iron core 100 is a five-legged iron core having five legs 102. Furthermore, the three molded coils 200 surround, for example, three legs 102a (see FIG. 2) that correspond to the main legs of the five legs 102 of the iron core 100, and are arranged along the X direction. One of the three molded coils 200 is connected to the other molded coils 200 by wiring WI. Note that the method of connecting the multiple molded coils 200 is not particularly limited.

The first frame 500 is disposed below the molded coil 200 (in the -Y direction relative to the molded coil 200) and supports the iron core 100 from below (in the -Y direction). For example, the first frame 500 is fixed to two pedestal portions 902, which will be described later, so that the transformer 10 is mounted on the mounting base 900. Details of the first frame 500 will be described later in FIG. 3. The second frame 600 is disposed above the molded coil 200 (in the +Y direction relative to the molded coil 200), for example.

The third frame 700 and the fourth frame 800 are disposed between the first frame 500 and the second frame 600 so as to sandwich the iron core 100 in the X direction, and are connected to the first frame 500 and the second frame 600. For example, the first frame 500 is connected to the third frame 700, the fourth frame 800, and the installation stand 900, etc., by screw fastening, welding, etc. Similarly, the second frame 600 is connected to the third frame 700 and the fourth frame 800, etc., by screw fastening, welding, etc. Note that screw fastening refers to connecting multiple elements to each other using screws SC such as bolts and nuts, for example.

The materials of the first frame 500, the second frame 600, the third frame 700, the fourth frame 800, and the installation base 900 are not particularly limited. For example, the first frame 500, the second frame 600, the third frame 700, the fourth frame 800, and the installation base 900 may be formed from a metal material such as iron.

The multiple first spacers 300 are supported by the first frame 500 and receive the three molded coils 200. The multiple second spacers 400 are disposed between the second frame 600 and the molded coils 200. The materials of the first spacers 300 and the second spacers 400 are not particularly limited, but the first spacers 300 and the second spacers 400 may be formed of an elastic body such as rubber.

The installation base 900 has two base parts 902 extending in the Z direction and arranged in the X direction, and a connecting part 904 extending in the X direction and connecting the two base parts 902. Since the first frame 500 is supported by the two base parts 902 arranged at a distance from each other in the X direction, if the strength of the first frame 500 against the load in the gravity direction is insufficient, the first frame 500 may be deformed by the weight of the transformer 10. For example, when the distance D1 between the two base parts 902 is large, it is desirable to increase the strength of the first frame 500 compared to when the distance D1 is small. For this reason, in this embodiment, the strength of the first frame 500 is improved by devising the structure of the first frame 500. Before describing the structure of the first frame 500, an example of the configuration of the iron core 100 will be described with reference to FIG. 2.

Figure 2 is an explanatory diagram for explaining the iron core 100 and molded coil 200 shown in Figure 1. Note that Figure 2 shows the iron core 100 and molded coil 200 viewed in a plan view from the +Z direction. In Figure 2, wiring WI and the like are omitted in order to make the drawing easier to see. Also, in Figure 2, in order to make the explanation easier to understand, the parts of the iron core 100 that are hidden by the molded coil 200 when the iron core 100 is viewed in a plan view from the +Z direction are shown by dotted lines.

In this embodiment, it is assumed that the core 100 is a laminated core formed by stacking multiple electromagnetic steel sheets. Note that the core 100 is not limited to a laminated core. The core 100 includes, for example, five legs 102 extending in the direction of gravity (-Y direction) and arranged in the X direction, a first yoke portion 104, and a second yoke portion 106. The five legs 102 are an example of "multiple legs", the first yoke portion 104 is an example of a "first yoke portion", and the second yoke portion 106 is an example of a "second yoke portion".

The five legs 102 include three legs 102a corresponding to the main legs and two legs 102b (i.e., side legs) corresponding to the return legs that function as the return legs of the magnetic circuit. The three legs 102a (main legs) are located between the two legs 102b (side legs). The three legs 102a are surrounded by three molded coils 200, respectively. In addition, for example, the first yoke portion 104 is a yoke that connects the lower ends of the five legs 102, and the second yoke portion 106 is a yoke that connects the upper ends of the five legs 102.

The surface BTy is the surface that is recognized when the first yoke part 104 is viewed in a plane from the -Y direction, i.e., the lower surface of the first yoke part 104. The surface SDy is the surface that is recognized when the first yoke part 104 is viewed in a plane from the +Z direction or the -Z direction, i.e., the side surface of the first yoke part 104 along the X direction. Hereinafter, the symbols BTy and SDy may not be used, and the surface BTy may be referred to as the bottom surface of the first yoke part 104, and the surface SDy may be referred to as the side surface of the first yoke part 104.

The three molded coils 200 correspond one-to-one to the three legs 102a (main legs) of the iron core 100. For example, each molded coil 200 includes a cylindrical first molded coil (not shown) whose winding surrounding the corresponding leg 102a is molded with insulating resin, and a cylindrical second molded coil (not shown) whose winding surrounding the first molded coil is molded with insulating resin.

Figure 3 is a schematic diagram of the transformer 10 shown in Figure 1 as viewed from the +X direction. In Figure 3, the structure of the first frame 500 is mainly described. Also, in order to make the description easier to understand, in Figure 3, the iron core 100 hidden by the third frame 700 when the transformer 10 is viewed in a plan view from the +X direction is shown by a dotted line.

The first frame 500 includes frame body members 520a and 520b extending in the X direction, and seat members 540a and 540b extending in the X direction. The configuration of the frame body member 520a is similar to that of the frame body member 520b, and the configuration of the seat member 540a is similar to that of the seat member 540b. Hereinafter, the frame body members 520a and 520b may be collectively referred to as the frame body member 520, and the seat members 540a and 540b may be collectively referred to as the seat member 540. In the first frame 500 shown in FIG. 3, when the first frame 500 is viewed in a plan view from the +X direction, each of the frame body member 520 and the seat member 540 is perceived as being L-shaped.

Each of the frame body members 520a and 520b includes a surface BTf facing the bottom surface of the first yoke portion 104, a bottom surface portion 532 extending in the X direction, and a surface SDf facing the side surface of the first yoke portion 104, and has a side surface portion 534 protruding upward from the bottom surface portion 532. For example, the surface SDf of the side surface portion 534 of the frame body member 520a faces the +Z side surface of the first yoke portion 104, and the surface SDf of the side surface portion 534 of the frame body member 520b faces the -Z side surface of the first yoke portion 104. In other words, the side surface portion 534 of the frame body member 520a and the side surface portion 534 of the frame body member 520b are arranged to sandwich the first yoke portion 104 in the Z direction.

The bottom surface portion 532 of the frame main body member 520a and the bottom surface portion 532 of the frame main body member 520b are disposed below the first yoke portion 104 and support the first yoke portion 104 from below. Therefore, the frame main body members 520a and 520b are disposed such that the bottom surface portion 532 is located below the first yoke portion 104 and the side surface portion 534 is located in the +Z direction and -Z direction relative to the first yoke portion 104. The bottom surface portion 532 including the bottom surface portion 532 of the frame main body member 520a and the bottom surface portion 532 of the frame main body member 520b is an example of a "support portion". The two side surface portions 534 of the side surface portion 534 of the frame main body member 520a and the side surface portion 534 of the frame main body member 520b are an example of "two side surface portions".

Each of the seat members 540a and 540b includes a seat portion 552 on which the first spacer 300 is placed, and a connection portion 554 connected to the side portion 534 of the frame main body member 520. For example, the seat member 540a is connected to the side portion 534 of the frame main body member 520a by screw fastening, welding, or the like so that the seat portion 552 protrudes in the +Z direction from a position between the upper edge and the lower edge of the side portion 534 of the frame main body member 520a. Also, for example, the seat member 540b is connected to the side portion 534 of the frame main body member 520b by screw fastening, welding, or the like so that the seat portion 552 protrudes in the -Z direction from a position between the upper edge and the lower edge of the side portion 534 of the frame main body member 520b.

That is, the seating surface portions 552 of each of the seating surface members 540a and 540b protrude in a direction away from the first yoke portion 104 from a position between the upper and lower edges of the side surface portions 534 of each of the frame body members 520a and 520b. Note that, for example, the positions in the Y direction of the seating surface portions 552 of the seating surface members 540a and 540b are the same or nearly the same. Hereinafter, the direction away from the first yoke portion 104 may be simply referred to as the outside.

The configuration of the transformer 10 is not limited to the examples shown in Figures 1 to 3. For example, the third frame 700 and the fourth frame 800 may be omitted. Next, the effect of the structure of the first frame 500 will be explained with reference to Figure 4.

Figure 4 is an explanatory diagram for explaining the effect of the first frame 500 shown in Figure 1. In Figure 4, the effect of the first frame 500 is explained in comparison with the comparative first frame 500EX. Note that in Figure 4, the third frame 700 and the like shown in Figure 3 are omitted in order to make the figure easier to see. First, the structure of the comparative first frame 500EX will be explained.

In the comparative example, one frame body member 528 including a bottom surface portion 532, two side surface portions 534, and two seat surface portions 552 extending in the X direction is formed as the first frame 500EX. For example, the two side surface portions 534 protrude upward from two edges along the X direction of the bottom surface portion 532. Also, the two seat surface portions 552 protrude outward (in a direction away from the first yoke portion 104) from the upper edges of the two side surface portions 534. Therefore, in the first frame 500EX, the distance D3 from the lower surface of the bottom surface portion 532 to the upper surface of the seat surface portion 552 corresponds to the length LYex (height of the side surface portion 534) along the gravity direction (-Y direction) of the side surface portion 534. The lower surface of the bottom surface portion 532 is, for example, a surface grasped when the bottom surface portion 532 is viewed in a plan view from the -Y direction. Furthermore, the upper surface of the seat portion 552 is the surface that can be seen when the seat portion 552 is viewed in a plan view from the +Y direction, for example.

Here, the distance D3 from the lower surface of the bottom portion 532 to the upper surface of the seat portion 552 is limited, for example, by the distance D2 from the lower surface of the bottom portion 532 to the lower surface of the molded coil 200 and the height of the first spacer 300. Furthermore, the distance D2 from the lower surface of the bottom portion 532 to the lower surface of the molded coil 200 is smaller, for example, when the thickness T1 (height) of the first yoke portion 104 is small, compared to when the thickness T1 of the first yoke portion 104 is large. Therefore, in the first frame 500EX, for example, when the thickness T1 of the first yoke portion 104 is small, the length LYex of the side portion 534 in the gravity direction is smaller, compared to when the thickness T1 of the first yoke portion 104 is large.

In contrast, in the first frame 500 of this embodiment, the seating surface 552 protrudes outward from a position between the upper edge and the lower edge of the side surface portion 534. In the first frame 500 shown in FIG. 4, it is assumed that the seating surface 552 is provided at a position distance D4 below the upper edge of the side surface portion 534. In this case, the length LY1 in the direction of gravity of the side surface portion 534 can be made longer by the distance D4 than the distance D3 from the lower surface of the bottom surface portion 532 to the upper surface of the seating surface portion 552. That is, in the first frame 500, the length LY1 in the direction of gravity of the side surface portion 534 in the first frame 500EX can be made longer than the length LYex in the direction of gravity of the side surface portion 534 in the first frame 500EX. Hereinafter, the lengths LY1 and LYex in the direction of gravity of the side surface portion 534 may be collectively referred to as the length LY in the direction of gravity of the side surface portion 534.

The strength of the first frame 500 against a load in the direction of gravity is lower when the length LY of the side portion 534 in the direction of gravity is small compared to when the length LY of the side portion 534 in the direction of gravity is large. In the first frame 500, the length LY of the side portion 534 in the direction of gravity can be made larger than in the comparative first frame 500EX, so that the strength of the first frame 500 can be increased. Furthermore, in the first frame 500, the connection portion 554 is connected to the side portion 534, so that the thickness in the Z direction of the connection portion between the side portion 534 and the connection portion 554 is larger than the thickness in the Z direction of the side portion 534 of the first frame 500EX. Therefore, in the first frame 500, the strength of the first frame 500 can be increased.

Furthermore, in the first frame 500, the side portion 534 is formed so that the upper edge of the side portion 534 is located between the upper surface of the seat portion 552 and the lower surface of the molded coil 200. Therefore, the height of the transformer 10 is the same as the height of the transformer 10EX in which the comparative first frame 500EX is used. That is, in this embodiment, the strength of the first frame 500 can be improved while preventing the height of the transformer 10 from increasing.

As described above, in this embodiment, the transformer 10 has an iron core 100, a plurality of molded coils 200, a first frame 500 that supports the iron core 100 from below, and a plurality of first spacers 300 that are supported by the first frame 500 and receive the plurality of molded coils 200. The iron core 100 includes a plurality of legs 102 extending in the direction of gravity (-Y direction), a first yoke portion 104 that connects the lower ends of the plurality of legs 102, and a second yoke portion 106 that connects the upper ends of the plurality of legs 102. The plurality of molded coils 200 each surround two or more legs 102b of the plurality of legs 102.

The first frame 500 includes a bottom surface portion 532 that supports the first yoke portion 104 from below, two side surface portions 534 that each protrude upward from the bottom surface portion 532, and a seat surface portion 552 provided on each of the two side surface portions 534. The bottom surface portion 532 includes a surface BTf that faces the bottom surface of the first yoke portion 104, and extends in the X direction, which is the arrangement direction of the multiple legs 102. The two side surface portions 534 are arranged to sandwich the first yoke portion 104 in the Z direction that is perpendicular to both the gravity direction and the X direction. The seat surface portion 552 protrudes from a position between the upper edge portion and the lower edge portion of the side surface portion 534 in a direction away from the first yoke portion 104. At least one of the multiple first spacers 300 is placed on the seat surface portion 552.

As described above, in this embodiment, the seating portion 552 of the first frame 500 is provided at a position between the upper edge and lower edge of the side portion 534. Therefore, in this embodiment, the length LY of the side portion 534 in the direction of gravity can be made longer than the distance D3 from the lower surface of the bottom portion 532 to the upper surface of the seating portion 552. As a result, in this embodiment, the strength of the first frame 500 can be increased compared to, for example, the first frame 500EX in which the seating portion 552 is provided at the upper edge of the side portion 534. In other words, in this embodiment, the strength of the first frame 500 that supports the iron core 100 of the transformer 10 can be improved.

A2: Second embodiment Figures 5, 6, and 7 are schematic diagrams of a transformer 10 according to a second embodiment. For example, Figure 5 is a schematic diagram of the transformer 10 according to the second embodiment as viewed from the +X direction. Also, Figure 6 is a schematic diagram of the transformer 10 shown in Figure 5 as viewed from the +Z direction. And, Figure 7 is a schematic diagram of the transformer 10 shown in Figure 5 as viewed from the -Y direction. Note that in Figures 5, 6, and 7, the first frame 500 is referred to as a first frame 500A. Elements similar to those described in Figures 1 to 4 are denoted by the same reference numerals, and detailed description thereof will be omitted.

The transformer 10 shown in Figures 5 to 7 is similar to the transformer 10 shown in Figure 1, etc., except that it has a first frame 500A instead of the first frame 500 shown in Figure 1, etc. In Figures 5, 6, and 7, the main differences between the first frame 500A and the first frame 500 shown in Figure 1, etc. are mainly described. The main difference between the first frame 500A and the first frame 500 shown in Figure 1, etc. is that the first frame 500A has a protruding portion 536 that protrudes downward from the bottom surface portion 532. The protruding portion 536 is an example of a "first reinforcing portion."

As shown in FIG. 5, the first frame 500A includes frame body members 522a and 522b extending in the X direction, and seat members 540a and 540b extending in the X direction. The seat members 540 (540a and 540b) are similar to the seat member 540 shown in FIG. 3. The configuration of the frame body member 522a is similar to the configuration of the frame body member 522b. Hereinafter, the frame body members 522a and 522b may be collectively referred to as the frame body member 522.

The frame body member 522 is similar to the frame body member 520 shown in FIG. 3, except that it includes a protrusion 536 that protrudes downward from the bottom surface portion 532 along the direction of gravity. For example, each of the frame body members 522a and 522b has a bottom surface portion 532 extending in the X direction, a side surface portion 534 that protrudes upward from the bottom surface portion 532, and a protrusion 536 that extends in the X direction and protrudes downward from the bottom surface portion 532. The protrusion 536 is provided, for example, on one of two edges of the bottom surface portion 532 extending in the X direction where the side surface portion 534 is not provided.

For example, the protrusion 536 of the frame main body member 522a is connected to the protrusion 536 of the frame main body member 522b by screw fastening, welding, or the like. That is, the protrusion 536 is disposed between two edges on which the two side portions 534 are provided, in the bottom surface portion 532 including the bottom surface portion 532 of the frame main body member 522a and the bottom surface portion 532 of the frame main body member 522b. In other words, the protrusion 536 is disposed between two edges along the X direction of the bottom surface portion 532 including the bottom surface portion 532 of the frame main body member 522a and the bottom surface portion 532 of the frame main body member 522b. For example, when the protrusion 536 is disposed near the center between two edges along the X direction of the bottom surface portion 532 including the bottom surface portion 532 of the frame main body member 522a and the bottom surface portion 532 of the frame main body member 522b, the strength near the two edges can be made the same or almost the same. In other words, when the protrusion 536 is disposed near the center between two edges along the X direction of the bottom surface portion 532 including the bottom surface portion 532 of the frame main body member 522a and the bottom surface portion 532 of the frame main body member 522b, the overall strength of the first frame 500A can be efficiently improved.

The seat member 540a is connected to the side surface portion 534 of the frame main body member 522a by screw fastening, welding, or the like, for example, so that the seat portion 552 protrudes in the +Z direction from a position between the upper and lower edges of the side surface portion 534 of the frame main body member 522a. The seat member 540b is connected to the side surface portion 534 of the frame main body member 522b by screw fastening, welding, or the like, for example, so that the seat portion 552 protrudes in the -Z direction from a position between the upper and lower edges of the side surface portion 534 of the frame main body member 522b.

The first frame 500A has a protrusion 536 that protrudes downward from the bottom surface 532 in the direction of gravity, so that the strength of the first frame 500 against loads in the direction of gravity can be increased compared to a first frame 500 that does not have a protrusion 536.

Furthermore, the protrusion 536 is disposed in the gap between the first frame 500 and the installation stand 900 that occurs when the first frame 500 that does not include the protrusion 536 is installed on the installation stand 900, as shown in, for example, Figures 5 to 7. Therefore, the height of the transformer 10 in which the first frame 500A is used is the same as the height of the transformer 10 in which the first frame 500 that does not include the protrusion 536 is used. That is, in this embodiment, the strength of the first frame 500A can be improved while preventing the height of the transformer 10 from increasing.

As described above, in this embodiment, the first frame 500A has, in addition to the bottom surface portion 532, the side surface portion 534, and the seat surface portion 552, a protrusion portion 536 that protrudes downward from the bottom surface portion 532 and extends in the X direction. In this manner, in this embodiment, the protrusion portion 536 that protrudes downward from the bottom surface portion 532 is provided on the first frame 500A, and therefore the strength of the first frame 500A can be improved.

In addition, in this embodiment, the protrusion 536 is disposed between two edges along the X direction of the bottom surface portion 532, including the bottom surface portion 532 of the frame main body member 522a and the bottom surface portion 532 of the frame main body member 522b. For example, when the protrusion 536 is disposed near the center between two edges along the X direction of the bottom surface portion 532, including the bottom surface portion 532 of the frame main body member 522a and the bottom surface portion 532 of the frame main body member 522b, the overall strength of the first frame 500A can be efficiently improved.

A3: Third embodiment Fig. 8 is a schematic diagram of a transformer 10 according to a third embodiment as viewed from the +X direction. In Fig. 8, the first frame 500 is referred to as a first frame 500B. Elements similar to those described in Figs. 1 to 7 are denoted by the same reference numerals, and detailed description thereof will be omitted.

The transformer 10 shown in FIG. 8 is similar to the transformer 10 shown in FIG. 5, etc., except that it has a first frame 500B instead of the first frame 500A shown in FIG. 5, etc. In FIG. 8, the main differences between the first frame 500B and the first frame 500A will be mainly described. The main difference between the first frame 500B and the first frame 500A is that a seat portion 552 is provided on the upper edge of the side portion 534.

The first frame 500B includes frame body members 524a and 524b extending in the X direction. The configuration of the frame body member 524a is similar to the configuration of the frame body member 524b. Hereinafter, the frame body members 524a and 524b may be collectively referred to as the frame body member 524. The frame body member 524 is similar to the frame body member 522 shown in FIG. 5, except that a seat portion 552 is formed that protrudes outward (away from the first yoke portion 104) from the upper edge of the side portion 534.

For example, each of the frame body members 524a and 524b has a bottom surface portion 532 extending in the X direction, a side surface portion 534 protruding upward from the bottom surface portion 532, a protruding portion 536 protruding downward from the bottom surface portion 532, and a seat surface portion 552 protruding outward from the upper edge of the side surface portion 534. Since the first frame 500B also has the protruding portion 536, the strength of the first frame 500B can be improved compared to a configuration in which the protruding portion 536 is not provided (for example, the first frame 500EX shown in FIG. 4).

As described above, in this embodiment, the transformer 10 has an iron core 100, a plurality of molded coils 200, a first frame 500B that supports the iron core 100 from below, and a plurality of first spacers 300 that are supported by the first frame 500B and receive the plurality of molded coils 200. The iron core 100 includes a plurality of legs 102 extending in the direction of gravity (-Y direction), a first yoke portion 104 that connects the lower ends of the plurality of legs 102, and a second yoke portion 106 that connects the upper ends of the plurality of legs 102. The plurality of molded coils 200 each surround two or more legs 102b of the plurality of legs 102.

The first frame 500B includes a bottom surface portion 532 that supports the first yoke portion 104 from below, two side surface portions 534 that each protrude upward from the bottom surface portion 532, a seat surface portion 552 provided on each of the two side surface portions 534, and a protrusion portion 536. The bottom surface portion 532 includes a surface BTf that faces the bottom surface of the first yoke portion 104, and extends in the X direction, which is the arrangement direction of the multiple legs 102. The two side surface portions 534 are arranged to sandwich the first yoke portion 104 in the Z direction that is perpendicular to both the gravity direction and the X direction. The seat surface portion 552 protrudes from the upper edge portion of the side surface portion 534 in a direction away from the first yoke portion 104. At least one of the multiple first spacers 300 is placed on the seat surface portion 552. The protrusion portion 536 protrudes downward from the bottom surface portion 532 and extends in the X direction.

In this manner, in this embodiment, the first frame 500B is provided with a protrusion 536 that protrudes downward from the bottom surface portion 532, thereby improving the strength of the first frame 500B.

B: Modifications The above-described embodiment may be modified in various ways. Specific modifications that may be applied to the above-described embodiment are illustrated below. Two or more of the following examples may be combined together as long as they are not mutually contradictory.

B1: First Modification In the above embodiment, three types of first frames 500, 500A, and 500B are exemplified as the first frame 500, but the present invention is not limited to such an embodiment. Several examples of the first frame 500 according to the first modification will be described with reference to Figs. 9 to 15.

Figure 9 is an explanatory diagram for explaining an example of the first frame 500 according to the first modified example. Also, each of Figures 10 to 15 is an explanatory diagram for explaining another example of the first frame 500 according to the first modified example. In each of Figures 9 to 15, the first frame 500 is referred to by adding any of the letters "C" to "I" to the end of the reference numeral.

For example, as shown in FIG. 9, the first frame 500C may have one frame body member 526 including a bottom surface portion 532 and two side surfaces 534 extending in the X direction, and two seat members 540 (540a and 540b). The seat members 540a and 540b are respectively connected to the two side surfaces 534 of the frame body member 526 by, for example, screw fastening or welding. That is, in the first frame 500C, the frame body members 520a and 520b shown in FIG. 3 are formed as one frame body member 526. The first frame 500C can also achieve the same effects as the first embodiment described above.

For example, as shown in FIG. 10, the first frame 500D may have a frame body member 526, two seat members 540 (540a and 540b), and a reinforcing member 537 extending in the X direction. The reinforcing member 537 is another example of a "first reinforcing portion". The reinforcing member 537 is connected to the lower surface of the bottom surface portion 532 by screw fastening, welding, or the like so as to protrude downward from the bottom surface portion 532 along the direction of gravity. The number of reinforcing members 537 connected to the lower surface of the bottom surface portion 532 may be two or more, as shown in FIG. 11. The strength of the first frame 500D is improved by the reinforcing member 537 connected to protrude downward from the bottom surface portion 532. Therefore, the first frame 500D can also obtain the same effect as the second embodiment described above.

For example, as shown in FIG. 11, the first frame 500E may have a frame main body member 528 and a plurality of reinforcing members 537 extending in the X direction and arranged along the Z direction. The plurality of reinforcing members 537 are an example of a "plurality of reinforcing parts". For example, the plurality of reinforcing members 537 are connected to the lower surface of the bottom surface portion 532 by screw fastening, welding, or the like so as to protrude downward from the bottom surface portion 532. Note that there may be only one reinforcing member 537 connected to the lower surface of the bottom surface portion 532. The strength of the first frame 500E is improved by the reinforcing member 537 connected to protrude downward from the bottom surface portion 532. In addition, when a plurality of reinforcing members 537 are provided, the strength of the first frame 500E can be further improved compared to when one reinforcing member 537 is provided.

Also, for example, as shown in FIG. 12, the first frame 500F may have a frame main body member 528 and two side members 535 (535a and 535b) extending in the X direction. The two side members 535 are an example of "two side portions". The side member 535a is connected, for example, by screw fastening, welding, etc. to the side portion 534 located in the +Z direction and the bottom portion 532 of the two side portions 534 of the frame main body member 528. Also, the side member 535b is connected, for example, by screw fastening, welding, etc. to the side portion 534 located in the -Z direction and the bottom portion 532 of the two side portions 534 of the frame main body member 528. Also, the side members 535 (535a and 535b) are formed so that when connected to the side portion 534 of the frame main body member 528, the upper edge portion is located in the +Y direction from the seat portion 552 of the frame main body member 528. This allows the length LY1 of the side member 535 in the direction of gravity to be longer than the length LYex of the side portion 534 of the frame main body member 528 in the direction of gravity. Therefore, the first frame 500F can also achieve the same effects as the first embodiment described above.

Also, for example, as shown in FIG. 13, the first frame 500G may have a frame main body member 528, two side members 535 (535a and 535b), and a reinforcing member 537. For example, the reinforcing member 537 is connected to the underside of the bottom portion 532 by screw fastening, welding, or the like so as to protrude downward from the bottom portion 532. That is, in the first frame 500G, the reinforcing member 537 is connected to the first frame 500F shown in FIG. 12. Therefore, the first frame 500G can also achieve the same effects as the second embodiment described above.

Also, for example, as shown in FIG. 14, the first frame 500H may have two frame body members 524 (524a and 524b) and two side members 535 (535a and 535b). The side member 535a is connected, for example, to the side portion 534 and the bottom portion 532 of the frame body member 524a by screw fastening, welding, or the like. The side member 535b is connected, for example, to the side portion 534 and the bottom portion 532 of the frame body member 524b by screw fastening, welding, or the like. The side member 535 is formed so that, when connected to the side portion 534 of the frame body member 524, the upper edge portion is located in the +Y direction from the seat portion 552 of the frame body member 524. Therefore, the first frame 500H can also obtain the same effect as the second embodiment described above.

15, the first frame 500I may have a frame main body member 526 and two seat members 542 (542a and 542b). Each of the seat members 542a and 542b has a seat portion 552 and a reinforcing portion 556 including a portion connected to the side portion 534 of the frame main body member 526. For example, each of the seat members 542a and 542b is connected to the side portion 534 of the frame main body member 526 by screw fastening, welding, or the like so that the seat portion 552 protrudes outward from a position between the upper edge portion and the lower edge portion of the side portion 534 of the frame main body member 526. The reinforcing portion 556 of the seat member 542 is formed so that the lower edge portion of the reinforcing portion 556 is located in the -Y direction from the bottom portion 532 of the frame main body member 526 when the seat member 542 is connected to the frame main body member 526. That is, a part of the reinforcing portion 556 protrudes downward from the bottom surface portion 532 of the frame main body member 526 in the direction of gravity. As a result, the reinforcing portion 556 of the seat member 542 functions as a reinforcing portion that reinforces the strength of the first frame 500I against loads in the direction of gravity. Therefore, the first frame 500I can also achieve the same effects as the second embodiment described above.

In the first embodiment described above, the seat member 542 may be connected to the frame body member 520 instead of the seat member 540. Alternatively, in the second embodiment described above, the seat member 542 may be connected to the frame body member 522 instead of the seat member 540.

B2: Second Modification In the above-described embodiment and the first modification, the case where the transformer 10 is a three-phase five-leg core transformer has been exemplified, but the present invention is not limited to such an embodiment. For example, the transformer 10 may be a transformer including a core 100 having three or more legs 102. Alternatively, the transformer 10 may be composed of two or more single-phase transformers.

10, 10EX... transformer, 100... core, 102... legs, 104... first yoke part, 106... second yoke part, 200... molded coil, 300... first spacer, 400... second spacer, 500, 500A-500I, 500EX... first frame, 520, 522, 524, 526, 528... frame body member, 532... bottom surface part, 534... side surface part, 535... side surface member, 536... protrusion part, 537... reinforcing member, 540, 542... seat member, 552... seat surface part, 556... reinforcing part, 600... second frame, 700... third frame, 800... fourth frame, 900... installation stand, SC... screws, WI... wiring.

Claims (5)

an iron core including a plurality of legs extending in a gravity direction, a first yoke portion connecting lower ends of the plurality of legs, and a second yoke portion connecting upper ends of the plurality of legs;
A plurality of coils each surrounding two or more of the plurality of legs;
A frame supporting the iron core from below;
a plurality of coil receiving members supported by the frame and receiving the plurality of coils;
Equipped with
The frame includes:
a support portion including a surface facing a bottom surface of the first yoke portion, extending in a first direction which is an arrangement direction of the plurality of legs, and supporting the first yoke portion from below;
two side surfaces that are disposed on either side of the first yoke portion in a second direction perpendicular to both the direction of gravity and the first direction, and each protrude upward from the support portion;
a plurality of bearing surface portions protruding from positions between upper and lower edges of each of the two side surface portions in a direction away from the first yoke portion along the second direction ;
A plurality of first reinforcing parts protruding downward from the support part, extending in the first direction, and arranged along the first direction;
Including ,
At least one of the coil receiving members is placed on each of the seating portions,
the frame is supported by two pedestals disposed at positions spaced apart from each other in the first direction,
Each of the plurality of first reinforcing parts is disposed between two edges of the support part along the first direction at a position avoiding the two pedestal parts.
A transformer characterized by: The frame includes:
a first frame body member and a second frame body member extending in the first direction and arranged along the second direction and connected to each other;
The support portion is
a first support portion and a second support portion that extend in the first direction and are disposed along the second direction and are included in the first frame body member and the second frame body member, respectively;
The two side portions are
a first side portion and a second side portion provided on two edges of the support portion along the first direction,
Each of the plurality of first reinforcing portions is
a first protruding portion that protrudes downward from an edge portion, of two edge portions along the first direction of the first support portion, where the first side surface portion is not provided, and extends in the first direction;
a second protruding portion that protrudes downward from an edge portion, of two edges along the first direction of the second support portion, on which the second side surface portion is not provided, extends in the first direction, and is connected to the first protruding portion;
The first protrusion and the second protrusion are connected to each other by screw fastening or welding, thereby connecting the first frame body member and the second frame body member to each other.
2. The transformer of claim 1. an iron core including a plurality of legs extending in a gravity direction, a first yoke portion connecting lower ends of the plurality of legs, and a second yoke portion connecting upper ends of the plurality of legs;
A plurality of coils each surrounding two or more of the plurality of legs;
A frame supporting the iron core from below;
a plurality of coil receiving members supported by the frame and receiving the plurality of coils;
Equipped with
The frame includes:
a support portion including a surface facing a bottom surface of the first yoke portion, extending in a first direction which is an arrangement direction of the plurality of legs, and supporting the first yoke portion from below;
two side surfaces that are disposed on either side of the first yoke portion in a second direction perpendicular to both the direction of gravity and the first direction, and each protrude upward from the support portion;
a plurality of bearing surface portions protruding from upper edges of the two side surface portions along the second direction in a direction away from the first yoke portion;
A plurality of first reinforcing parts protruding downward from the support part, extending in the first direction, and arranged along the first direction ;
Including ,
At least one of the coil receiving members is placed on each of the seating portions,
the frame is supported by two pedestals disposed at positions spaced apart from each other in the first direction,
Each of the plurality of first reinforcing parts is disposed between two edges of the support part along the first direction at a position avoiding the two pedestal parts.
A transformer characterized by: The frame includes:
a first frame body member and a second frame body member extending in the first direction and arranged along the second direction and connected to each other;
The support portion is
a first support portion and a second support portion that extend in the first direction and are disposed along the second direction and are included in the first frame body member and the second frame body member, respectively;
The two side portions are
a first side portion and a second side portion provided on two edges of the support portion along the first direction,
Each of the plurality of first reinforcing portions is
a first protruding portion that protrudes downward from an edge portion, of two edge portions along the first direction of the first support portion, where the first side surface portion is not provided, and extends in the first direction;
a second protruding portion that protrudes downward from an edge portion of the second support portion along the first direction where the second side surface portion is not provided, extends in the first direction, and is connected to the first protruding portion;
The first protrusion and the second protrusion are connected to each other by screw fastening or welding, thereby connecting the first frame body member and the second frame body member to each other.
4. The transformer according to claim 3 . The frame includes:
a plurality of second reinforcing parts arranged along the first direction between one of the two edge parts of the frame and the first reinforcing part ;
a plurality of third reinforcing parts disposed along the first direction between the other edge part of the two edge parts of the frame and the first reinforcing parts ,
Each of the plurality of second reinforcing portions is
a support portion that protrudes downward from the support portion and extends in the first direction;
Each of the plurality of third reinforcing portions is
A protruding portion protrudes downward from the support portion and extends in the first direction.
4. A transformer according to claim 1 or 3.

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