JP2019029505A - Core support structure of transformer - Google Patents

Abstract

To reduce the iron loss on a support plate while manufacturing the support plate inexpensively.SOLUTION: A transformer (1) includes an iron core (10) in which an opening portion (103) is formed by winding an amorphous alloy ribbon, a winding (20) inserted in the iron core, and a support plate (40) for supporting the iron core. The iron core includes a plurality of leg portions (11 to 13), an upper yoke portion (14) connecting the upper end portions of the plurality of leg portions, and a lower yoke portion (15) connecting the lower end portions. The support plate (40) is provided with a flat plate portion (401) in each of a portion in contact with the inner surface (103c) of the upper yoke portion in the opening portion and a portion in contact with the inner surface of the lower yoke portion. A slit (405) serving as a blocking portion for blocking eddy current generated by leakage magnetic flux from the iron core is formed in the flat plate portion.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a core support structure for a transformer, and more particularly to a core support structure for a transformer including an iron core in which amorphous alloy ribbons are wound in multiple layers.

  The transformer is a device that converts the voltage of AC power using electromagnetic induction, and includes an iron core that forms a magnetic circuit and a winding (coil) that forms an electric circuit. In such a transformer, what employ | adopted the wound iron core which wound the amorphous alloy ribbon in multiple layers as an iron core is known (for example, refer patent document 1). By using the amorphous alloy ribbon as described above, it is possible to configure an iron core with low loss and excellent magnetic characteristics. The wound iron core of Patent Document 1 includes two leg portions and two yoke portions that connect between one end portion and the other end portion of these leg portions, and is surrounded by each leg portion and each yoke portion. An opening is formed.

  Here, the amorphous alloy ribbon has a very thin plate thickness for manufacturing reasons, and has a low rigidity. For this reason, in a wound iron core in which amorphous alloy ribbons are wound in multiple layers, the yoke portion is not sufficiently supported by the leg portions and deformation or distortion occurs, and the magnetic properties of the wound iron core are likely to deteriorate. Then, the structure which provides a plate-shaped support member so that it may be along the inner surface side of a yoke part inside an opening part, and the shape of maintaining a wound iron core is known.

JP 2000-21642 A

  However, in the configuration in which the support member is provided as described above, since the leakage magnetic flux generated from the wound iron core is linked to the support member, an eddy current is generated at the linked position and the iron loss is increased. There is. In particular, wound cores using amorphous alloy ribbons have less loss, so iron loss in the support member accounts for a large percentage of the overall transformer loss, and it is important to reduce iron loss in the support member Increases nature. Further, if a nonmagnetic material is used for the support member, the iron loss of the support member can be reduced, but there is a problem that the material cost of the support member increases.

  This invention is made | formed in view of this point, and it aims at providing the iron core support structure of the transformer which can reduce the iron loss in a support member, manufacturing a support member cheaply. .

  The transformer core support structure according to the present invention includes a wound core in which an opening is formed, a winding inserted in the wound core, and a support member that supports the wound core. A flat plate portion disposed in the opening of the wound core and in contact with the inner side surface of the wound core is provided with a blocking portion for blocking eddy current generated by leakage magnetic flux from the wound core. It is characterized by being.

  The transformer core support structure according to the present invention includes a wound core in which an opening is formed, a winding inserted in the wound core, and a support member that supports the wound core. , Disposed in the opening of the wound core, and a portion that contacts the inner surface of the opening of the wound core and a portion of the wound core that contacts the inner surface of the opening facing the inner surface, respectively. A flat plate portion is provided, and at least one of the flat plate portions is formed with a blocking portion for blocking eddy current generated by leakage magnetic flux from the wound core.

  According to such a structure, since the interruption | blocking part was formed in the flat plate part of a supporting member, a flat plate part can be divided | segmented by a interruption | blocking part and an eddy current can be interrupted | blocked by an interruption | blocking part. Thereby, the amount of eddy current with respect to the interlinkage magnetic flux can be reduced, and iron loss in the support member can be reduced. As a result, it is possible to suppress a relatively large loss in the support member, particularly in an iron core made of an amorphous alloy ribbon with little loss, and to support deformation caused by the low rigidity of the amorphous alloy ribbon. Can be suppressed. In addition, since it is only necessary to perform a process for forming a blocking part at a position where eddy currents are generated, the blocking part can be formed by a simple additional process, and it is not necessary to use an expensive nonmagnetic material. Can be suppressed.

  According to the iron core support structure of the transformer of the present invention, since the blocking portion is formed in the flat plate portion of the support member, the iron loss in the support member can be reduced while the support member is manufactured at low cost.

It is a front view which shows the principal part of the transformer with which the iron core support structure which concerns on this Embodiment is applied. 2A to 2C are explanatory diagrams of a support plate included in the transformer according to the present embodiment. 3A is a cross-sectional view taken along the two-dot chain line AA shown in FIG. 1, and FIG. 3B is an enlarged view of a fixing portion of the support plate. It is explanatory drawing of the manufacturing process of the transformer which concerns on this Embodiment. It is explanatory drawing of the manufacturing process of the transformer which concerns on this Embodiment. It is explanatory drawing of the manufacturing process of the transformer which concerns on this Embodiment. It is explanatory drawing of the manufacturing process of the transformer which concerns on this Embodiment. FIG. 8A is an explanatory diagram schematically showing eddy currents in the flat plate portion according to the present embodiment, and FIG. 8B is an explanatory diagram schematically showing eddy currents in the flat plate portion of the conventional structure.

  Hereinafter, a transformer core support structure according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. In addition, below, the case where the iron core support structure which concerns on this invention is applied to a mold transformer is demonstrated. However, the application target of the iron core support structure according to the present invention is not limited to the mold transformer, and can be appropriately changed. For example, the present invention can be applied to dry transformers other than mold transformers (for example, Class H dry transformers), gas-insulated transformers, and oil-filled transformers.

  FIG. 1 is a front view showing a main part of a transformer to which the iron core support structure according to the present embodiment is applied. A transformer 1 shown in FIG. 1 includes an iron core 10 that forms a magnetic circuit, a winding (coil) 20 that forms an electric circuit, and a frame 30 that houses a part of the iron core 10. FIG. 1 shows a transformer 1 having a three-phase three-leg structure in which a part of an iron core 10 inserted into three windings 20 is fixed to a pair of upper and lower frames 30 (301, 302). In addition, about the structure of the transformer used as the application object of this invention, it is not limited to this, It is applicable to the transformer 1 which has arbitrary structures, such as a 3 phase 5 leg structure.

  The iron core 10 is formed of a wound iron core in which amorphous alloy ribbons are wound in multiple layers and are generally rectangular in a front view. More specifically, the iron core 10 is composed of a wound iron core wound with a 25 μm amorphous alloy ribbon. As shown in FIG. 1, the iron core 10 has a pair of inner iron core portions 101 arranged on the inner side and an outer iron core portion 102 arranged on the outer side (outer peripheral side) of the inner iron core portions 101. . Each inner iron core portion 101 is individually wound with an amorphous alloy ribbon.

  An opening 103 is formed at the center of each inner iron core portion 101 constituting the iron core 10. That is, the iron core 10 is formed with a pair of openings 103a and 103b penetrating perpendicularly to the lamination direction of the electromagnetic steel sheets. These openings 103 may be called window portions of the iron core 10. The iron core 10 includes a plurality of (in this embodiment, three) leg portions 11 to 13 extending in the vertical direction and an upper iron portion (first portion) that connects between upper end portions that are one end portions of the leg portions 11 to 13. The yoke portion 14 is provided in a shape including a lower yoke portion (second yoke portion) 15 that connects the lower end portions that are the other end portions of the leg portions 11 to 13. In addition, on the inner periphery of the inner iron core portion 101 and the outer periphery of the outer iron core portion 102, electromagnetic steel plates are disposed to maintain the shape of the iron core 10 and reinforce the iron core 10 itself.

  The winding 20 has, for example, an inner winding 201 and an outer winding 202 (not shown in FIG. 1, refer to FIG. 5), and the entire surface of these windings 20 is covered with resin or an insulating material containing resin. Has been. For example, an epoxy resin excellent in heat resistance and electrical insulation is used as the resin that covers the winding 20. Each winding 20 is arranged around each leg 11 to 13 of the iron core 10. These windings 20 are positioned with respect to the frame 30 (301, 302) via a spacer member (not shown).

  The frame 30 has an upper frame 301 and a lower frame 302. The upper frame 301 has a box shape opened to the lower side, and is configured to accommodate the upper iron part 14 of the iron core 10 therein. On the other hand, the lower frame 302 has a box shape opened to the upper side, and is configured to accommodate the succeeding iron portion 15 of the iron core 10 therein. These frames 30 function as a jig when the transformer 1 is assembled, and also protect the iron core 10 and the winding 20 after the assembly is completed.

  A plurality of (four in the present embodiment) support plates 40 constituting the support member are fixed to the frame 30. These support plates 40 are disposed in the opening 103 of the iron core 10 and are fixed to the frame 30 from the inside of the iron core 10. More specifically, these support plates 40 are fixed to the frame 30 in a state where the iron core 10 is supported while being in surface contact with the inner side surface 103 c of the opening 103. These support plates 40 are fixed to a flange portion 30a (see FIG. 3) of the frame 30 described later. These support plates 40 function as an example of a support member that supports the iron core 10.

  The support plate 40 is formed by, for example, punching and bending a metal plate material such as mild steel. In the present embodiment, the support plate 40 includes a pair of upper support plates 41 and 42 and a pair of lower support plates 43 and 44. The pair of upper support plates 41 and 42 are fixed to the upper frame 301. On the other hand, the pair of lower support plates 43 and 44 are fixed to the lower frame 302. Moreover, the upper side support plate 41 and the lower side support plate 43 are arrange | positioned in the opening part 103a. On the other hand, the upper support plate 42 and the lower support plate 44 are disposed in the opening 103b.

  FIG. 2 is an explanatory diagram of the support plate 40 included in the transformer 1 according to the present embodiment. FIG. 2 shows a plan view (FIG. 2A), a side view (FIG. 2B), and a front view (FIG. 2C) of the support plate 40. The upper support plates 41 and 42 and the lower support plates 43 and 44 constituting the support plate 40 have a common configuration.

  As shown in FIG. 2A, the support plate 40 has a flat plate portion 401 whose main surfaces on both sides in the thickness direction, that is, the front and back surfaces are generally rectangular. In the flat plate portion 401, the vertical direction in FIG. 2A is the longitudinal direction, and the horizontal direction in FIG. 2A is the short direction. The flat plate portion 401 has tongue pieces 402 formed in the vicinity of the four corners. These tongue pieces 402 constitute a part of the flat plate portion 401 and are formed to extend in the longitudinal direction of the flat plate portion 401. The dimension L1 in the longitudinal direction of the flat plate part 401 (including the tongue piece part 402) is configured to be wider than the dimension L2 in the width direction of the iron core 10 in a side view (see FIG. 3A). That is, the flat plate portion 401 has a width wider than the width of the iron core 10.

  A shaft portion 403 is provided on the upper surface of each tongue piece portion 402. These shaft portions 403 extend in a direction orthogonal to the tongue piece portion 402 (flat plate portion 401) (see FIGS. 2B and 2C). A screw groove (not shown) is formed around these shaft portions 403. In the following, for convenience of explanation, the tongue piece portion 402 extending upward of the flat plate portion 401 shown in FIG. 2A is referred to as a “tongue piece portion 402 a”, and the tongue piece portion 402 extending downward of the flat plate portion 401. Is referred to as "tongue piece 402b". Further, the shaft portion 403 provided on the tongue piece portion 402a is referred to as “shaft portion 403a”, and the shaft portion 403 provided on the tongue piece portion 402b is referred to as “shaft portion 403b”. These shaft portions 403 function as an example of a fixing portion that fixes the support plate 40 to the frame 30.

  A pair of hanging portions 404 is formed on the side edge of the flat plate portion 401. These hanging portions 404 are formed on the side of the flat plate portion 401 where the tongue piece portion 402 is not formed. Each drooping portion 404 extends in a direction orthogonal to the flat plate portion 401 (a direction opposite to the shaft portion 403). The hanging portion 404 is used for positioning the support plate 40 in the horizontal direction (left-right direction shown in FIG. 1A) when the support plate 40 is disposed in the opening 103 of the iron core 10.

  Furthermore, a plurality of (four in this embodiment) slits 405 extending in the longitudinal direction are formed in the flat plate portion 401. The slit 405 is formed as an opening having a predetermined width dimension orthogonal to the extending direction and penetrating the flat plate portion 401 in the thickness direction. The plurality of slits 405 are formed in parallel to each other and have the same length. In the plurality of slits 405, the intervals between the slits 405 adjacent in the short direction of the flat plate portion 401 are uniform, that is, the slits 405 are formed at equal intervals. Note that the function exhibited by the slit 405 will be described later.

  With such a configuration, the support plate 40 is disposed in the opening 103 of the iron core 10 and is fixed to the frame 30 from the inside of the iron core 10. Hereinafter, the fixing mode of the support plate 40 will be described with reference to FIGS. 1 and 3. 3 is a cross-sectional view (FIG. 3A) taken along a two-dot chain line AA shown in FIG. 1 and an enlarged view (FIG. 3B) of a fixed portion of the support plate 40. FIG. 3B shows an enlarged view of the configuration within the two-dot chain line shown in FIG. 3A. In FIG. 3A, the winding 20 is omitted for convenience of explanation.

  As shown in FIG. 3A, a flange portion 30 a is provided at the lower end portion of the upper frame 301 and the upper end portion of the lower frame 302. The flange portion 30a is provided to extend from the lower end portion of the upper frame 301 and the upper end portion of the lower frame 302 to the side shown in FIG. 3A. The lower surface (upper surface) of the flange portion 30a disposed on the opposite side across the iron core 10 is disposed on the same plane. A through hole 30b through which the shaft portion 403 of the support plate 40 is inserted is formed at a predetermined position of the flange portion 30a (see FIG. 3B).

  The upper support plate 42 is disposed in the opening 103 b of the iron core 10 so as to be in surface contact with the upper inner surface 103 c of the opening 103 b on the upper surface of the flat plate portion 401. At this time, the upper support plate 42 is disposed such that the shaft portion 403 (403a, 403b) of the tongue piece portion 402 (402a, 402b) is inserted into the through hole 30b of the flange portion 30a. More specifically, the shaft portion 403 is inserted through the through hole 30b in a state where the nut N1 is mounted in the thread groove (see FIG. 3B). Then, a plurality (two in this embodiment) of nuts N2 and N3 are attached to the shaft portion 403 protruding from the through hole 30b. The upper support plate 42 is fixed to the upper frame 301 by tightening these nuts N1 to N3.

  The lower support plate 44 is fixed to the lower frame 302 in the same manner as the upper support plate 42. The method of fixing the lower support plate 44 to the lower frame 302 is the same as that of the upper support plate 42 except that the vertical direction is reversed. For this reason, the fixed state is shown in FIG. 3A, and the description thereof is omitted. In addition, as a supplement, the lower support plate 44 is disposed so as to be in surface contact with the inner side surface 103c on the lower side of the opening 103b (the side facing the upper inner side surface 103c) on the lower surface of the flat plate portion 401. Moreover, since the fixing mode of the support plate 40 in the opening 103a of the iron core 10 is the same as the fixing mode in the opening 103b, the description thereof is omitted.

  Hereinafter, the process of manufacturing the transformer 1 having the above configuration will be described with reference to FIGS. 4-7 is explanatory drawing of the manufacturing process of the transformer 1 which concerns on this Embodiment. In addition, in the manufacturing process of the transformer 1 shown below, the process before the opening operation of the iron core 10 and the process after the closing operation are omitted for convenience of explanation. 4 to 7, a part of the rail R arranged along the production line of the transformer 1 and a lower surface of the lower frame 302 are provided, and the movement of the transformer 1 on the rail R is illustrated. The moving mechanism M to support is shown.

  In the opening operation of the iron core 10, as shown in FIG. 1, the central portion of the rectangular iron-shaped inner core portion 101 and the outer iron core portion 102 that extends in the horizontal direction at the upper iron portion 14 is opened. It is generally U-shaped when viewed from the front (see FIG. 4). In addition, in the manufacturing process shown in FIGS. 4-7, although the case where an overlap system is applied in the opening operation | work and closing operation | work of the iron core 10 is demonstrated, it is not limited to this, A step lap system etc. Other schemes may be applied.

  The opening operation of the iron core 10 is performed in a state where the iron core 10 is fixed to the lower frame 302 (see FIG. 4). In this case, the iron core 10 is fixed to the lower frame 302 via the lower support plates 43 and 44. The lower support plates 43, 44 are the inner side surface of the inner iron core portion 101 (the lower inner surface that defines the opening 103) and are in the state of being in surface contact with the inner surface (upper surface) of the lower iron portion 15. It is fixed to the frame 302 (see FIG. 1). As shown in FIG. 4, the iron core 10 whose opening operation has been completed is in a state in which the inner iron core portion 101 and the outer iron core portion 102 extend upward on the lower frame 302.

  The winding 20 is attached to the iron core 10 so that the iron core 10 (the inner iron core portion 101 and the outer iron core portion 102) thus opened is inserted into the winding wire 20 (iron core insertion step). In this iron core insertion step, the iron core 10 (the inner iron core portion 101 and the outer iron core portion 102) is inserted into the through-hole 203 inside the inner winding 201 constituting the winding 20. Thereby, as shown in FIG. 5, the winding 20 is arranged at a predetermined position on the lower frame 302. At this time, the iron core 10 protrudes upward from the through hole 203 of the winding 20.

  And the upper side support plates 41 and 42 are arrange | positioned so that it may be located between the iron cores 10 which protrude upwards rather than the coil | winding 20 (refer FIG. 6). In this case, the upper support plates 41 and 42 are arranged in a state where the shaft portions 403 (403a and 403b) protrude upward. The upper support plates 41 and 42 are temporarily disposed on a spacer member (not shown). This spacer member is placed on the upper end surface of the winding 20. By mounting on the winding 20 in this manner, the upper support plates 41 and 42 are disposed in the opening 103 of the iron core 10.

  In the state where the upper support plates 41 and 42 are disposed on the winding 20, as shown in FIG. 6, the inner core portion 101 and the outer core portion 102 disposed on the outer side do not interfere with the closing operation. The outer side of the transformer 1 is bent.

  The inner iron core 101 and the outer iron core 102 bent outward are bent inward, and the inner iron core 101 arranged in the center is bent outward. And these inner side iron core part 101 and the outer side iron core part 102 are closed (closing process). In this closing process, as shown in FIG. 7, the end surfaces of the amorphous alloy ribbons constituting the inner core portion 101 and the outer core portion 102 are joined. Through this closing process, the iron core 10 returns to the state before opening. Note that the closing operation of the iron core 10 is sometimes referred to as a joining operation or a re-joining operation of the iron core 10. In FIG. 7, for convenience of explanation, the center of the closing position of the outer iron core portion 102 is indicated by a broken line C. .

  After completing the closing process, the upper frame 301 is disposed on the iron core 10. The upper frame 301 is disposed so as to accommodate the upper end portion of the iron core 10 exposed from the winding 20 (see FIG. 1). In this case, the upper frame 301 is disposed on a spacer member (not shown). This spacer member is placed on the upper end surface of the winding 20.

  After the upper frame 301 is disposed, the upper support plates 41 and 42 placed on the upper end surface of the winding 20 are fixed to the upper frame 301. In this case, the upper support plates 41 and 42 are fixed to the upper frame 301 while supporting the iron core 10 from the inside. More specifically, it is fixed to the upper frame 301 in a state where it is in surface contact with and supported by the upper inner surface that defines the opening 103 of the iron core 10 (see FIG. 1). Through the series of steps as described above, the transformer 1 according to the present embodiment is completed.

  Next, an eddy current generated in the flat plate portion 401 of the support plate 40 will be described. By supplying a predetermined power to the completed transformer 1, a current flows through the winding 20 to generate a main magnetic flux (not shown) and a leakage magnetic flux L in the iron core 10, and the leakage magnetic flux L is, for example, It occurs in the position and direction indicated by the dotted line in FIG. Such leakage magnetic flux enters the support plate 40 and is linked in the thickness direction of the flat plate portion 401, and an eddy current is generated around the leakage magnetic flux L. If an eddy current is generated, it causes iron loss. Therefore, it is necessary to suppress the amount of eddy current. At the same time, there is a demand for reducing the manufacturing cost of the transformer 1 by reducing material costs and reducing the burden of processing work. Therefore, in the present embodiment, the slit 405 shown in FIG. 3A is formed in the flat plate portion 401.

  Here, the eddy current generated in the flat plate portion will be described by comparing the type of the present embodiment in which the slit 405 is formed and the conventional structure type in which the slit 405 is not formed. FIG. 8A is an explanatory diagram schematically showing eddy currents in the flat plate portion according to the present embodiment, and FIG. 8B is an explanatory diagram schematically showing eddy currents in the flat plate portion of the conventional structure. The support plate 40A having the conventional structure in FIG. 8B is configured in the same manner as the support plate 40 of the embodiment, except that the slit 405 of the above embodiment is not formed on the flat plate portion 401A. When the leakage magnetic flux L is linked to the flat plate portion 401A of FIG. 8B, eddy currents E are generated at a plurality of locations. The eddy current E is generated in a region where the outermost peripheral portion reaches the outer edge of the flat plate portion 401A or the outermost peripheral portion of the adjacent eddy current E. In the example of the conventional structure in FIG. 8B, eddy currents E having substantially the same magnitude are generated so that the flat plate portion 401A is equally divided into three in the longitudinal direction.

  On the other hand, in the present embodiment of FIG. 8A, the slit 405 is formed to divide the flat plate portion 401, and the eddy current E can be prevented from flowing at the position where the slit 405 is formed. In other words, the slit 405 is formed to function as a blocking space (blocking portion) that blocks eddy current. Thereby, in comparison with the conventional structure, in this embodiment, the region where the eddy current E of the flat plate portion 401 flows is narrowed in the short direction of the flat plate portion 401, and the eddy current E is divided in the short direction. it can. As a result, the diameter of each eddy current E is reduced, and even if the same leakage magnetic flux L as that in the conventional structure is linked, the region through which the eddy current E flows can be reduced to reduce the current amount of the eddy current E. it can.

  For example, in the present embodiment in FIG. 8A, the flat plate portion 401 is equally divided into three in the short direction in the formation region by four slits 405. Thereby, although the number of eddy currents E formed is three times that of the conventional structure of FIG. 8B, the diameter dimension of the eddy currents E can be reduced to about 1/3. As a result, in this embodiment, the total area through which the eddy current E flows can be reduced to about 1/3 of the conventional structure, and the amount of eddy current E is proportional to the area of the eddy current E. The iron loss caused by the eddy current E can be reduced.

  As described above, in the present embodiment, since the slit 405 is formed as a blocking space (blocking portion) that blocks eddy current in the flat plate portion 401, the interlinkage leakage magnetic flux L compared to the case where the slit 405 is not formed. The iron loss at the flat plate portion 401 can be reduced by reducing the amount of eddy current E with respect to the plate portion 401. And in contrast with the iron core 10 using the amorphous alloy ribbon with few losses, it can avoid that the loss in the flat plate part 401 becomes large and the performance as the whole transformer 1 falls.

  In addition, since the iron loss can be reduced by a simple process of forming the slit 405, it is not necessary to use an expensive nonmagnetic material for the support plate 40 or to make the support plate 40 have a complicated laminated structure. Thereby, in order to reduce the iron loss of the support plate 40, it can suppress that a manufacturing cost raises and can implement | achieve the cheap support plate 40. FIG.

  In addition, since the slit 405 extends in the longitudinal direction of the flat plate portion 401, the length of one slit 405 can be secured long, and the area and width of the divided region can be reduced with respect to the number of slits 405 formed. can do. Thereby, it is possible to reduce the number of times the slit 405 is processed or shorten the processing time while maintaining the effect of reducing the iron loss, and it is also possible to suppress the manufacturing cost.

  Furthermore, since the adjacent slits 405 are formed at equal intervals, the magnitude of the eddy current E generated between the slits 405 can be made uniform. As a result, the amount of iron loss caused by the eddy current E can be easily calculated, and the design according to the specifications of the transformer 1 as a whole can be facilitated.

  In addition, this invention is not limited to the said embodiment, It can implement variously. In the above-described embodiment, the size, shape, and the like illustrated in the accompanying drawings are not limited thereto, and can be appropriately changed within a range in which the effect of the present invention is exhibited. In addition, various modifications can be made without departing from the scope of the object of the present invention.

  For example, in the above embodiment, the slits 405 are formed on the four support plates 40 (the upper support plates 41 and 42 and the lower support plates 43 and 44). It may be formed only on the side support plates 43 and 44. When the slit 405 is formed only in the lower support plates 43 and 44, one end of each leg portion 11 to 13 is a lower end portion, the other end portion is an upper end portion, and the lower yoke portion 15 is the first yoke portion, The upper yoke portion 14 becomes the second yoke portion.

  Moreover, the interruption | blocking part which interrupts | blocks an eddy current in the flat plate part 401 is not limited to said slit 405, A various change is possible. For example, the flat plate portion 401 may be divided and formed in the short-side direction, and a gap may be provided between them so as to be a blocking portion. In addition, the length of the slit 405 is extended in the short direction, for example, the length of the slit 405 is changed in the extending direction, such as changing the direction in which the slit 405 is formed, For example, a rectangular or circular opening may be formed to form a blocking portion. Moreover, the interruption | blocking part does not need to be a space and it is good also as a structure provided with the nonelectroconductive member etc. which have the property which interrupts | blocks an eddy current in a slit.

  Moreover, in the said embodiment, the case where the iron core 10 is fixed to the upper side frame 301 and the lower side frame 302 via the upper side support plates 41 and 42 and the lower side support plates 43 and 44 is demonstrated. However, the manner of fixing the iron core 10 by the support plate 40 is not limited to this and can be changed as appropriate. For example, it is good also as an aspect fixed to the upper flame | frame 301 using only the upper side support plates 41 and 42. FIG.

  In the present embodiment, the configuration in which the present invention is applied to a transformer has been described. However, as long as the above-described effects can be obtained, the present invention can be applied to other power stationary devices and power conversion devices. is there.

  According to the iron core support structure of the transformer of the present invention, the transformer including the wound iron core wound with the amorphous alloy ribbon is produced while producing the support plate at a low cost while reducing the iron loss in the support plate. Can be suitably used.

DESCRIPTION OF SYMBOLS 1 Transformer 10 Iron core 103, 103a, 103b Opening part 103c Inner side surface 11-13 Leg part 14 Upper yoke part (1st yoke part)
15 Relay part (second yoke part)
20 Winding 40 Support plate 401 Flat plate portion 405 Slit (opening, blocking portion)
41, 42 Upper support plate 43, 44 Lower support plate E Eddy current L Leakage flux

Claims (7)

A wound core formed with an opening; a winding inserted into the wound core; and a support member that supports the wound core;
The support member includes a flat plate portion that is disposed in the opening of the wound core and contacts an inner surface of the wound core;
2. A transformer core support structure according to claim 1, wherein the flat plate portion is formed with a blocking portion for blocking eddy current generated by leakage magnetic flux from the wound core. A wound core formed with an opening; a winding inserted into the wound core; and a support member that supports the wound core;
The support member is disposed in the opening of the wound core and contacts a portion that contacts the inner surface of the opening of the wound core and an inner surface of the wound core that faces the inner surface of the opening. Each part has a flat plate part,
The transformer core support structure according to claim 1, wherein a blocking portion that blocks eddy current generated by leakage magnetic flux from the wound core is formed on at least one of the flat plate portions.   3. The transformer core support structure according to claim 1, wherein the blocking portion is formed by an opening penetrating the flat plate portion. 4.   4. The transformer core support structure according to claim 1, wherein the blocking portion is formed by a slit formed in the flat plate portion. 5. The flat plate portion is provided in a shape in which the main surfaces on both sides in the thickness direction have a longitudinal direction and a short direction,
The transformer core support structure according to claim 4, wherein the slit extends in the longitudinal direction.   6. The transformer core support structure according to claim 4, wherein a plurality of the slits are formed in parallel, and the adjacent slits are formed at equal intervals.   The transformer core support structure according to any one of claims 1 to 6, wherein the wound iron core is formed by winding an amorphous alloy ribbon.

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