JP6397349B2 - Three-phase five-legged iron core and stationary electromagnetic equipment - Google Patents

Description

  The present invention relates to a three-phase five-legged iron core and a stationary electromagnetic device using the three-phase five-legged iron core.

  An iron core of a static electromagnetic device (transformer, reactor, etc.) is composed of a wound iron core using a thin ribbon-like magnetic material for the purpose of suppressing loss due to eddy current. Here, the ribbon-shaped magnetic material is obtained by forming a low-loss magnetic material such as an ultrathin electromagnetic steel sheet, amorphous, or nanocrystalline alloy into a ribbon having a thickness of 100 μm or less. Such a ribbon-shaped magnetic material is cut into a specified length and stacked in large numbers to form a U-shaped iron core having an open end such as a lap joint joint, and after inserting a coil from the open end, By closing the open end, a so-called wound iron core having a substantially circular ring shape or a substantially rectangular ring shape is formed.

  A three-phase static electromagnetic device is configured by arranging a plurality of wound cores having a three-phase coil as described above. The arrangement and configuration method includes two-phase three-legged type and three-phase five-legged type. There is one. A three-phase five-legged iron core provided with side legs on both sides of a three-phase coil can suppress the height of the case although the width of the housing is larger than a three-phase tripod type without side legs. For this reason, the three-phase five-legged iron core is used particularly for applications where it is desired to lower the casing, and because it is advantageous in terms of stability in installation, it is often used in large three-phase static electromagnetic devices. Patent Document 1 discloses an example of a method for manufacturing a transformer using a wound iron core (see FIGS. 1 to 19 of Patent Document 1).

  Also, in general static electromagnetic devices, not limited to three-phase five-legged cores, stray loss occurs due to leakage flux from the coils interlinking with peripheral structures such as iron core fixings and storage tanks. Many techniques have disclosed techniques for suppressing this. For example, in Patent Document 2, in order to reduce stray loss, “the magnetic shields 20 and 21 having high permeability on the surfaces of the L-shaped iron core clamps 17 and 18 and the flat core clamp 19 , 19 are respectively provided with high-permeability magnetic shields 22, 22, and the magnetic shields 20, 22, 21 form a closed magnetic circuit around the inner winding 15 and the outer winding 16. (See paragraph 0020 of FIG. 4 and FIG. 4).

JP 2003-133141 A JP 2002-075752 A

  A three-phase AC stationary electromagnetic device using a three-phase five-legged iron core has a feature that reluctance (magnetic resistance) of a magnetic circuit between U-phase and W-phase coils on both sides is large. For this reason, the magnetic flux generated by these coils does not flow between the U-phase and W-phase magnetic legs, and most of them flow into the central V-phase magnetic legs. As a result, the magnetic flux concentrates on the center V-phase magnetic leg, and the loss (no-load loss such as hysteresis loss) generated in the iron core increases. That is, in a conventional static electromagnetic device using a three-phase five-legged iron core, there is a technical problem to be solved that the central V-phase iron core is locally overheated due to an increase in no-load loss due to magnetic flux concentration. .

  However, Patent Documents 1 and 2 do not recognize any technical problem that the magnetic flux concentrates on the iron core of the center V-phase magnetic leg or the iron core locally overheats due to no-load loss. In Patent Document 2, magnetic shields 20, 22, and 21 are shown as components that are structurally similar to the additional iron core 2 (see FIG. 1 and the like) described in detail in the embodiment of the present invention. However, the magnetic shields 20, 22, and 21 are intended to reduce stray loss due to leakage magnetic flux and to prevent overheating of the iron core fasteners 17 and 18 and the like. It does not relieve the magnetic flux concentration to prevent overheating.

  In view of the above-described conventional technical problems, the present invention provides a three-phase five-legged core that can alleviate the concentration of magnetic flux generated by a three-phase AC coil on the central core and prevent overheating. It is another object of the present invention to provide a static electromagnetic device using the three-phase five-legged core.

  The three-phase five-legged iron core according to the invention has four substantially rectangular annular wound cores formed by stacking a plurality of thin strip-shaped magnetic materials, and the side surfaces of the rings of each wound iron core are in contact with substantially the same surface. And a set of wound cores arranged so that the outer peripheral portions of adjacent wound cores are in contact with each other, and among the core parts of the respective wound cores constituting the set of wound cores, The outer peripheral parts of the wound cores adjacent to each other are in contact with each other, and the coil is wound and fixed to the side part of the yoke part excluding the iron core part which becomes three magnetic legs, with an insulating material interposed therebetween. And an additional iron core.

  According to the present invention, a three-phase five-legged iron core and its three-phase five-legged iron core that can alleviate the concentration of magnetic flux generated by a three-phase AC coil on the central iron core and prevent the overheating thereof. The used static electromagnetic device can be provided.

The example of the perspective view which showed the structure of the three-phase pentapod type iron core which concerns on the 1st Embodiment of this invention. The example of the perspective view of the static electromagnetic device using the three-phase five-legged iron core of FIG. The figure which showed typically the example of the cross-section of the yoke part of the wound iron core including the additional iron core in the upper side of the static electromagnetic device of FIG. The figure which showed the other example which clamps and fixes a wound iron core and an additional iron core according to the example of the cross-section of the yoke part of the upper side of the static electromagnetic device of FIG. The example of the longitudinal cross-section of the upper half of the three-phase five-legged stationary electromagnetic device used as the object of the three-dimensional electromagnetic field analysis simulation. The figure which showed the example of the result of the three-dimensional electromagnetic field analysis simulation. The figure which showed the other example of the result of the three-dimensional electromagnetic field analysis simulation. The example of the perspective view which showed the structure of the three-phase pentapod type iron core which concerns on the 2nd Embodiment of this invention. The example of the perspective view which showed the structure of the three-phase five-legged type iron core which concerns on the 3rd Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, in each drawing, the same code | symbol is attached | subjected to a common component and the overlapping description is abbreviate | omitted.

(First embodiment)
FIG. 1 is an example of a perspective view showing the structure of a three-phase five-legged iron core 10 according to the first embodiment of the present invention, and FIG. 2 is a static electromagnetic using the three-phase five-legged iron core 10 of FIG. 3 is a diagram illustrating an example of a perspective view of the device 20. FIG. In the present embodiment, for convenience of explanation, the stationary electromagnetic device 20 is a three-phase AC transformer, but may be a three-phase AC reactor or the like.

  As shown in FIG. 1, a three-phase five-legged core 10 according to the present embodiment is configured in a ladder shape by arranging four substantially rectangular annular wound cores 1 side by side. Here, the wound iron core 1 is formed by stacking a plurality of ribbon-shaped magnetic materials made of an ultrathin electromagnetic steel sheet, amorphous, nanocrystalline alloy, or the like. At this time, the four wound cores 1 are arranged in a row so that the side surfaces of the rings of the respective wound cores 1 are in contact with substantially the same surface, and the outer peripheral portions of the wound cores 1 adjacent to each other in the left-right direction are Arranged to touch. That is, the four wound iron cores 1 are arranged in a ladder form in a horizontal line and on the same plane. In this specification, up, down, front, back, left, and right are used as terms indicating directions. These directions mean, for example, the arrow directions shown at the bottom left in FIG. In the present embodiment, the three-phase five-legged iron core 10 is further provided with the additional iron core 2 that is the second iron core. Details of the additional iron core 2 will be described later.

  In FIG. 1, each wound iron core 1 is drawn as an integrated unit in which two opposing side surfaces of the unit wound iron cores 1 a are joined via an insulating material 6. Thus, in this embodiment, the wound iron core 1 may be composed of a plurality of unit wound iron cores 1a whose side surfaces facing each other are joined via the insulating material 6, or one unit winding. It may be configured only from the iron core 1a.

  Here, among the core portions of the wound cores 1 juxtaposed in a row of four, the core portions where the outer peripheral portions of the adjacent wound cores 1 are in contact with each other (portions indicated as U phase, V phase and W phase in FIG. 1) ) Is called a magnetic leg because the low voltage coil 4b and the high voltage coil 4a are wound as shown in FIG. On the other hand, a portion that is not a magnetic leg among the core portions of the wound cores 1 juxtaposed in a row is called a yoke portion.

  In this embodiment, as shown in FIG. 1 and FIG. 2, a substantially rectangular annular additional iron core 2 is provided on the side surface portion of the yoke portion of the wound iron core 1 arranged in parallel in four rows. That is, the additional iron core 2 is provided so as to go around the yoke portions on the upper side and the lower side of the four wound cores 1 and the yoke portions on the left side and the right side of the wound core 1 at the two ends.

  Here, like the wound core 1, the additional iron core 2 is formed by stacking a plurality of thin strip-shaped magnetic materials made of ultrathin electromagnetic steel sheets, amorphous, nanocrystalline alloys, and the like. The ribbon of the ribbon-shaped magnetic material forming the yoke portion of the wound core 1 and the ribbon of the ribbon-shaped magnetic material forming the additional iron core 2 provided on the side surface of the yoke portion of the wound core 1 are respectively It is assumed that the direction of the ribbon is the same and the plane of the ribbon is substantially parallel. By doing so, the magnetic flux in the wound core 1 can easily flow into the additional core 2.

  Further, an insulating material 6a (see FIG. 3; not shown in FIGS. 1 and 2) is sandwiched between the additional iron core 2 and the side surface of the yoke portion of the wound iron core 1, and the wound iron core 1, the insulating material 6a and The additional iron core 2 is fastened and integrated by a string-like or tape-like bind material 3 (in FIG. 1 and the like, the bind material 3 is drawn in a string shape). The binding material 3 for fastening and fixing is made of nonmagnetic metal, resin, plastic, glass fiber, or the like.

  1 and 2, the binding material 3 is drawn at a total of twelve places, but has an appropriate strength according to the size of the stationary electromagnetic device 20 and the weight of the wound core 1, and an appropriate number The material and the number are not limited as long as they are fixed. Moreover, although the insulating material 6a is provided in order to suppress the eddy current etc. between the wound iron core 1 and the additional iron core 2, it is good also as a thing without the insulating material 6a.

  Further, as shown in FIG. 2, the stationary electromagnetic device 20 is configured by winding a low-voltage coil 4 b and a high-voltage coil 4 a around magnetic legs indicated as U phase, V phase, and W phase in FIG. 1. The low voltage coil 4b and the high voltage coil 4a are provided with a low voltage electrode 5b and a high voltage electrode 5a, respectively. However, in the perspective view of FIG. 2, the high-voltage electrode 5 a is arranged on the back side of the three-phase five-legged iron core 10 and is not drawn as invisible (see FIG. 3).

  The stationary electromagnetic device 20 includes, for example, four U-shaped wound cores 1 each having a joint such as a lap joint or a butt joint, and windings corresponding to the magnetic legs of the U phase, the V phase, and the W phase, respectively. After the low voltage coil 4b and the high voltage coil 4a are inserted from the open end of the iron core 1, the open ends of the respective wound iron cores 1 are closed (see Patent Document 1, etc.). Therefore, the three-phase five-legged iron core 10 and the stationary electromagnetic device 20 are completed almost simultaneously.

  FIG. 3 is a diagram schematically showing an example of a cross-sectional structure of the yoke portion of the wound core 1 including the additional iron core 2 on the upper side of the static electromagnetic device 20 of FIG. 2, for example, indicated as A in FIG. The example of the cross-sectional structure in the vicinity position in which the binding material 3 was provided is shown. In FIG. 3, the binding material 3 is drawn by a one-dot chain line, and the cross-sectional shapes of the low voltage coil 4 b and the high voltage coil 4 a located in front of or behind this cross sectional position are indicated by long broken lines, and the low voltage electrode 5 b and the high voltage The electrode 5a is indicated by a thick dotted line.

  The unit wound core 1a is configured by overlapping and winding a thin strip-shaped magnetic material having a width W2 so as to have a thickness C2, and the two unit wound cores 1a sandwich an insulating material 6 having a thickness G2 between each other. It is in close contact. Further, an additional iron core 2 formed by stacking a thin strip-like magnetic material having a width W to a thickness C is formed on both side surfaces of the wound iron core 1 composed of these two unit-wound iron cores 1a. The material 6a is in close contact with each other. The string-like or tape-like binding material 3 is provided so as to surround the wound iron core 1 and the additional iron core 2, and fastens and fixes the wound iron core 1 and the additional iron core 2.

  Here, if the width W of the additional iron core 2 is made smaller than the protruding amount D of the low voltage coil 4b and the high voltage coil 4a from the wound core 1, the housing volume of the stationary electromagnetic device 20 will not increase. 3 shows the case where the thickness C of the additional iron core 2 is the same as the thickness C2 of the wound iron core 1 and is equal to each other. However, if the insulation distance from the low-voltage electrode 5b can be secured appropriately, the thickness C2 If the size of the housing has room, the size may be increased.

  As shown in FIG. 3, the pair of low-voltage electrodes 5 b connected to the low-voltage coil 4 b is bent to ensure an insulation distance from the additional iron core 2, and the wound iron core 1 provided with the additional iron core 2. It is pulled out above the yoke part. Here, in order to reduce Joule heat due to a large current, the low voltage coil 4b is wound inside the high voltage coil 4a.

  FIG. 4 is a view showing another example of tightening and fixing the wound iron core 1 and the additional iron core 2 according to the example of the sectional structure of the yoke portion on the upper side of the stationary electromagnetic device 20 in FIG. In this example, as a member for fastening and fixing the wound iron core 1 and the additional iron core 2, not the binding material 3 but a plate-like fixing bracket 7 and stud bolt 8 are used.

  As shown in FIG. 4, a pair of fixing metal fittings 7 are provided on the outer side surfaces of the two additional iron cores 2 provided on both side surfaces of the two wound iron cores 1 via the insulating material 6a. The pair of fixing brackets 7 are connected by at least two stud bolts 8. Therefore, by tightening the stud bolt 8, the pair of fixing fittings 7 presses the additional iron core 2 from the outside, and the additional iron core 2 is fastened and fixed to the wound iron core 1.

  Next, the effect of this embodiment is demonstrated using the result of a three-dimensional electromagnetic field analysis simulation. FIG. 5 is an example of a vertical cross-sectional view of the upper half of a three-phase five-legged stationary electromagnetic device 20 used as a target for a three-dimensional electromagnetic field analysis simulation. Here, the stationary electromagnetic device 20 is a transformer. In the three-dimensional electromagnetic field analysis simulation, in consideration of the vertical symmetry of the shape of the three-phase five-legged stationary electromagnetic device 20, the electromagnetic field is measured for the ½ cut model of only the upper half from the center of the magnetic leg. Analytical calculations were performed. In the electromagnetic field analysis calculation, the leakage magnetic field at each point on the line segment B-B ′ drawn in FIG. 5 is calculated, and the result will be described later.

In this three-dimensional electromagnetic field analysis simulation, the material constituting the wound core 1 and the additional iron core 2 is a characteristic of an amorphous alloy having a saturation magnetic flux density of 1.63 T (specifically, 2605HB1M type amorphous alloy manufactured by Hitachi Metals, Ltd.). Was assumed to have The various dimensions that define the size of the wound iron core 1 and the additional iron core 2 constituting the stationary electromagnetic device 20 are as shown in Table 1 below.

  In Table 1 and FIG. 5, the symbol H representing the dimension represents a half value of the height of the wound core 1, and the symbol H2 represents the height of the low voltage coil 4b and the high voltage coil 4a wound around the three magnetic legs. The half value of. Moreover, the code | symbol E1 represents the internal dimension along the sequence direction of the two inner winding cores 1 among the four wound cores 1 shown in FIG. 5, and the code | symbol E2 is winding of two outer side (right end and left end). The inner dimension along the arrangement direction of the iron cores 1 is represented. Note that the dimension E1 is larger than the dimension E2 because the low voltage coil 4b and the high voltage coil 4a are wound around the inner three magnetic legs.

  Further, here, the outer peripheral portions of the four wound iron cores 1 are not in direct contact with each other, but are in contact with each other through a slight gap dimension G3. Therefore, the dimension L along the arrangement direction of the wound cores 1 of the three magnetic legs around which the low voltage coil 4b and the high voltage coil 4a are wound is expressed as L = 2 × C2 + G3. The total length S of the four wound cores 1 along the arrangement direction is expressed as S = 3 × L + 2 × (C2 + E1 + E2).

  In addition, the code | symbol showing the dimension which is not shown by FIG. 5 among the code | symbols shown in Table 3 is the same as the code | symbol shown by FIG. That is, symbol C is the thickness of the additional iron core 2, symbol W is the width of the additional iron core 2, symbol W2 is the width of the unit wound core 1a, and symbol G2 is insulation sandwiched between the two unit wound cores 1a. This represents the thickness of the material 6.

The excitation conditions for the high voltage coil 4a and the low voltage coil 4b set when performing the three-dimensional electromagnetic field analysis simulation are as shown in Table 2 below.

  FIG. 6 is a diagram illustrating an example of a result of a three-dimensional electromagnetic field analysis simulation. In FIG. 6, the result of the three-dimensional electromagnetic field analysis simulation is a vertical line segment BB ′ (length 400 mm) set above the central magnetic leg (the magnetic leg indicated as V phase in FIG. 1). : Refer to FIG. 5) It is shown as a graph showing the change in the magnitude of the leakage magnetic field at each position above. That is, the horizontal axis of the graph of FIG. 6 represents the position on the line segment B-B ′ above the central magnetic leg, and the vertical axis represents the leakage magnetic field strength H.

  In the graph of FIG. 6, the thickness W of the insulating material 6a sandwiched between the wound iron core 1 and the additional iron core 2 is used as the third variation parameter. That is, the broken line 50 shown in FIG. 6 represents the change of the leakage magnetic field when the additional iron core 2 is not provided as a comparative example, and the broken lines 50a, 50b, and 50c are when the additional iron core 2 is provided. The change in the leakage magnetic field when the thickness G of the insulating material 6a is 6.5 mm, 1 mm, and 0.2 mm, respectively.

  From the results of the three-dimensional electromagnetic field analysis simulation shown in FIG. 6 above, it can be seen that the leakage magnetic field is greatest at the point B closest to the wound core 1 and decreases as the distance from the wound core 1 increases. Moreover, when the additional iron core 2 is provided, it turns out that the leakage magnetic field has decreased to half or less compared with the case where the additional iron core 2 is not provided. Furthermore, it can be seen that the leakage magnetic field decreases as the thickness G of the insulating material 6a sandwiched between the wound iron core 1 and the additional iron core 2 decreases.

  Generally, in a stationary electromagnetic device such as a transformer, a large leakage magnetic field indicates that magnetic flux concentration is generated in an iron core used in the stationary electromagnetic device. That is, when the magnetic flux density in the iron core increases due to magnetic flux concentration and approaches magnetic saturation, the magnetic permeability decreases. As a result, the magnetic flux easily leaks out of the iron core, and the leakage magnetic field in the peripheral region of the iron core increases. That is, the result shown in FIG. 6 is nothing but the fact that the magnetic flux concentration on the center magnetic leg shown as the V phase in FIG. 1 is alleviated by providing the additional iron core 2.

  The relaxation of the magnetic flux concentration on the center V-phase magnetic leg can also be explained as follows. That is, by providing the additional iron core 2, the reluctance (magnetic resistance) between the magnetic legs indicated as the U phase and the W phase in FIG. 1 is lowered. Therefore, the magnetic flux generated at the magnetic legs of the U phase and the W phase easily flows not only to the magnetic legs of the center V phase but also to the magnetic legs of the W phase and U phase opposite to each other. Therefore, the magnetic flux concentration on the center V-phase magnetic leg is alleviated.

  Further, the smaller the thickness G of the insulating material 6a sandwiched between the wound core 1 and the additional iron core 2, the smaller the leakage magnetic field. The smaller the thickness G of the insulating material 6a, the smaller the wound core 1 and the additional iron core 2 It can be easily understood from the fact that the reluctance (magnetoresistance) between them becomes small. Therefore, it can be said that the smaller the thickness G of the insulating material 6a, the greater the effect of relaxing the magnetic flux concentration on the center V-phase magnetic leg.

  FIG. 7 is a diagram showing another example of the result of the three-dimensional electromagnetic field analysis simulation. In FIG. 7, the horizontal axis of the graph represents the thickness G of the insulating material 6a sandwiched between the wound iron core 1 and the additional iron core 2, and the vertical axis represents the static electromagnetic device 20 (transformer) according to the present embodiment. It represents no-load loss Wi. Here, the no-load loss Wi represents the magnetic flux density distribution in the entire iron core obtained by the three-dimensional electromagnetic field analysis simulation, the loss characteristics of the iron core material (the above-mentioned amorphous alloy), and the excitation conditions shown in Table 2 (however, The frequency of the coil current is 50 Hz), and the no-load loss generated in the entire iron core is calculated. However, the value of the no-load loss Wi on the vertical axis of the graph of FIG. 7 is expressed as a relative value when the no-load loss of the transformer of the comparative example without the additional iron core 2 is 100.

  In the stationary electromagnetic device 20 (transformer) provided with the additional iron core 2 according to the present embodiment, the weight increases as compared with the conventional transformer without the additional iron core 2, but as shown in FIG. The no-load loss Wi decreases. Incidentally, when the thickness G of the insulating material 6a is 0.2 mm, the no-load loss Wi decreases by about 10%.

  By the way, when the frequency of the coil current is constant, the no-load loss Wi is assumed to be large in proportion to the square of the magnetic flux. Therefore, it can be said that the reduction of the no-load loss Wi in the entire iron core due to the provision of the additional iron core 2 means that the magnetic flux concentration on some of the magnetic legs has been alleviated. In addition, it is clear from what has been described so far that some of the magnetic legs here are the magnetic legs at the center indicated as the V phase in FIG.

  As described above, according to the present embodiment, the magnetic flux concentration on the center V-phase magnetic leg can be alleviated. Therefore, it is possible to prevent overheating of the V-phase magnetic leg in the center caused by the magnetic flux concentration.

(Second Embodiment)
FIG. 8 is an example of a perspective view showing the structure of a three-phase five-legged iron core 10a according to the second embodiment of the present invention. As shown in FIG. 8, the three-phase five-legged iron core 10a according to the present embodiment is the three-phase five-legged type according to the first embodiment shown in FIG. 1 except that the structure of the additional iron core 2a is different. The same as the iron core 10. That is, similarly to the first embodiment, the three-phase five-legged iron core 10a is configured by juxtaposing four wound iron cores 1 configured in a substantially rectangular ring shape by stacking a plurality of thin ribbon magnetic materials. On the other hand, the additional iron core 2a is formed by stacking a plurality of ribbon-like magnetic materials, and the shape thereof is a square rod shape that is long in the band direction of the ribbon-like magnetic material.

  In this embodiment, four long square-shaped additional iron cores 2a as described above are used, and each of the additional iron cores 2a is a yoke portion of the wound iron core 1 constituting the U-phase, V-phase, and W-phase magnetic legs. Of these, the magnetic leg is provided on both side surfaces of the upper and lower yoke portions. At this time, an insulating material 6a having a thickness G (see FIG. 3; not shown in FIG. 8) is sandwiched between the wound iron core 1 and the additional iron core 2a, as in the first embodiment. The wound iron core 1 and the additional iron core 2a are fastened and fixed by a string-like or tape-like nonmagnetic binding material 3. In FIG. 8, the binding materials 3 are drawn in a total of eight places, but depending on the size of the stationary electromagnetic device using the three-phase five-legged core 10 a and the weight of the wound core 1, As long as it has strength and is fixed with an appropriate number, the material and the number are not limited.

  Even in the static electromagnetic device using the three-phase five-legged core 10a configured as described above, the additional iron core 2a has a reluctance between the magnetic legs indicated as the U-phase and the W-phase, to some extent. It does not change to reduce (magnetic resistance). That is, the additional iron core 2a disperses the magnetic flux flowing into the central V-phase magnetic leg to other magnetic legs, so that the effect of preventing overheating of the central V-phase magnetic leg can also be recognized in this embodiment. .

  Moreover, in this embodiment, the weight of the additional iron core 2a is reduced compared with the additional iron core 2 in 1st Embodiment. Therefore, this embodiment is suitable for the case where it is desired to suppress the weight of the static electromagnetic device or for a large capacity large size static electromagnetic device.

(Third embodiment)
FIG. 9 is an example of a perspective view showing the structure of a three-phase five-legged iron core 10b according to the third embodiment of the present invention. As shown in FIG. 9, the three-phase five-legged iron core 10b according to the present embodiment has the three-phase five-legged iron core 10b according to the first embodiment shown in FIG. 1 except that the structure of the additional iron core 2b is different. The same as the iron core 10. That is, as in the first embodiment, the three-phase five-legged iron core 10b and the eight wound iron cores 1 configured in a substantially rectangular ring shape by stacking a plurality of thin strip-shaped magnetic materials are arranged side by side. On the other hand, the additional iron core 2b is formed by stacking a plurality of thin ribbon magnetic materials, and the shape thereof is a rectangular parallelepiped.

  In the present embodiment, twelve rectangular parallelepiped additional iron cores 2b are used. And each additional iron core 2b comprises each of the two wound cores 1 on the side surfaces of the upper and lower yoke parts constituting the magnetic legs of the U phase, V phase and W phase and adjacent to each other. Are connected to each other. At this time, an insulating material 6a having a thickness G (see FIG. 3; not shown in FIG. 9) is sandwiched between the wound core 1 and the additional iron core 2b, as in the first embodiment. The wound iron core 1 and the additional iron core 2b are fastened and fixed by a string-like or tape-like nonmagnetic binding material 3. In FIG. 9, the binding material 3 is drawn at a total of twelve places. However, depending on the size of the stationary electromagnetic device using the three-phase five-legged core 10 b and the weight of the wound core 1, As long as it has strength and is fixed with an appropriate number, the material and the number are not limited.

  Even in the static electromagnetic device using the three-phase five-legged core 10b configured as described above, the additional iron core 2b has a reluctance between the magnetic legs indicated as the U-phase and the W-phase, to some extent. It does not change to reduce (magnetic resistance). In other words, the additional iron core 2b disperses the magnetic flux flowing into the central V-phase magnetic leg to other magnetic legs, so that the effect of preventing overheating of the central V-phase magnetic leg can be recognized also in this embodiment. .

  Moreover, in this embodiment, the weight of the additional iron core 2b is reduced not only in the additional iron core 2 in 1st Embodiment but compared with the additional iron core 2a in 2nd Embodiment. Therefore, this embodiment is suitable for the case where it is desired to suppress the weight of the static electromagnetic device or for a large capacity large size static electromagnetic device.

  The present invention is not limited to the above-described embodiments and modifications, and further includes various modifications. For example, the above-described embodiments and modifications have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. In addition, a part of the configuration of an embodiment or modification can be replaced with the configuration of another embodiment or modification, and the configuration of another embodiment or modification can be replaced with another embodiment or modification. It is also possible to add the following configuration. In addition, with respect to a part of the configuration of each embodiment or modification, the configuration included in another embodiment or modification may be added, deleted, or replaced.

1 Rolled iron core 1a Unit wound iron core 2, 2a, 2b Additional iron core (second iron core)
DESCRIPTION OF SYMBOLS 3 Binding material 4a High voltage coil 4b Low voltage coil 5a High voltage electrode 5b Low voltage electrode 6, 6a Insulation material 7 Fixing bracket 8 Stud bolt 10, 10a, 10b Three-phase five-legged iron core 20 Static electromagnetic device

Claims (9)

Four substantially rectangular annular wound cores configured by laminating a plurality of thin ribbon magnetic materials, and a set of wound cores arranged in a row so that the outer peripheral portions of the adjacent wound cores are in contact with each other;
Out of the core parts of the wound cores constituting the set of wound cores, the outer peripheral parts of the adjacent wound cores are in contact with each other, and the coils are wound to remove the core parts that are respectively three magnetic legs. A second iron core attached and fixed to the side surface of the yoke part with an insulating material interposed therebetween;
A three-phase five-legged iron core characterized by comprising 2. The three-phase five-legged core according to claim 1, wherein the second iron core is a substantially rectangular annular iron core, and is attached to a side surface portion of the yoke portion so as to go around the yoke portion. . The second iron core is a straight rectangular iron core, and continuously connects four yoke portions substantially perpendicular to the magnetic legs at the upper part or the lower part of the three magnetic legs among the yoke parts. The three-phase five-legged iron core according to claim 1, wherein the three-phase five-legged iron core is attached to side surfaces of the yoke portions. The second iron core is a rectangular parallelepiped iron core, and the yoke portions of the wound cores adjacent to each other at the upper part and the lower part of the three magnetic legs are respectively connected to the side parts of the yoke parts. The three-phase five-legged iron core according to claim 1, wherein the three-phase five-legged iron core is attached. 2. The three-phase five-legged core according to claim 1, wherein the second iron core is attached and fixed to a side surface portion of the wound iron core with a string-like or tape-like nonmagnetic binding material. The second iron core includes fixing metal fittings provided on both side surface portions of the second iron core disposed on both side surface portions of the wound iron core, and fixing metal fittings provided on both side surface portions of the second iron core. The three-phase five-legged iron core according to claim 1, wherein the three-phase five-legged iron core is fixed to a side surface portion of the wound core with a stat bolt that is connected and tightened. 2. The three-phase five-legged core according to claim 1, wherein the second iron core is an iron core formed by stacking a plurality of thin ribbon-like magnetic materials. The direction of the ribbon and the surface direction of the ribbon-shaped magnetic material constituting the second iron core are the direction of the ribbon of the ribbon-like magnetic material constituting the wound iron core in the vicinity where the second iron core is attached and The three-phase five-legged iron core according to claim 7, wherein the three-phase five-legged iron core is substantially the same as a surface direction. A static electromagnetic device comprising a three-phase alternating current coil wound around the three magnetic legs of the three-phase five-legged iron core according to any one of claims 1 to 8. .

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