CN105895328B - Three-phase five-limb iron core and stationary electromagnetic equipment - Google Patents

Abstract

The present invention provides a three-phase five-column type iron core and a static electromagnetic device capable of alleviating flux concentration in the central iron core, thereby preventing the iron core from overheating. The four winding iron cores (1) constituting the three-phase five-pillar type iron core (10) are arranged in a row in such a manner that the outer peripheries of the adjacent winding iron cores (1) are in contact with each other. The coils are wound on the iron core parts where the outer peripheral parts of the wound cores (1) are in contact with each other, and respectively constitute U-phase, V-phase, and W-phase magnetic columns, and in the four wound cores (1) as these magnetic The yoke part other than the column is provided with a substantially rectangular ring-shaped additional core (2) that wraps around the side of the yoke part, and the winding core (1) and the additional core (2) pass through the rope. Shape or tape-like binding parts (3) are clamped and fixed.

Description

Three-phase five-column iron core and static electromagnetic equipment

technical field

The invention relates to a three-phase five-column iron core and a static electromagnetic device using the three-phase five-column iron core.

Background technique

The iron cores of static electromagnetic equipment (transformers, reactors, etc.) are composed of wound iron cores using thin strip-shaped magnetic materials in order to suppress losses due to eddy currents. Here, the thin strip-shaped magnetic material is obtained by forming a low-loss magnetic material such as an ultra-thin electrical steel sheet, amorphous, or nanocrystalline alloy into a thin strip with a thickness of 100 μm or less. Such a thin strip-shaped magnetic material is cut to a predetermined length and stacked in multiple layers to form a U-shaped iron core with an open end such as a lap joint. After inserting a coil from the open end, the open end is closed to form a substantially circular core. A so-called wound core in the shape of a ring or a substantially rectangular ring.

Three-phase stationary electromagnetic equipment is constructed by arranging a plurality of the above-mentioned wound iron cores having three-phase coils, and there are two types of three-phase three-column type and three-phase five-column type in the configuration method. The three-phase five-pillar type core having side columns on both sides of the three-phase coil can suppress the height although the width of the frame is larger than the three-phase three-pillar type core having no side columns. Therefore, the three-phase five-pillar core can be particularly used in applications requiring a lower frame, and because it has an advantage in stability during installation, it is often used in large-scale three-phase static electromagnetic equipment. In addition, Patent Document 1 discloses an example of a method of manufacturing a transformer using a wound core (see FIGS. 1 to 19 of Patent Document 1, etc.).

In addition, it is not limited to three-phase five-pillar cores. In general static electromagnetic equipment, stray loss occurs due to the leakage flux from the coil interlinking with the fixing parts of the core and surrounding structures such as storage boxes. Techniques for suppressing this are disclosed in many documents. For example, in Patent Document 2, in order to reduce stray loss, it is described that "the magnetic shields 20, 21 with high magnetic permeability are provided on the surfaces of the cross-sectional L-shaped iron core clamps 17, 18, and the flat iron core clamps Magnetic shields 22, 22 with high magnetic permeability are arranged on the surfaces of the tight parts 19, 19, and the magnetic shields 20, 22, 21 form a closed magnetic circuit around the inner winding 15 and the outer winding 16." (Referring to Patent Document 2 Paragraph 0020, Figure 4).

A three-phase AC stationary electromagnetic device using a three-phase five-column iron core is characterized by a large reluctance of a magnetic circuit between U-phase and W-phase coils on both sides. Therefore, the magnetic flux generated by these coils does not flow between the U-phase and W-phase magnetic columns, but mostly flows into the central V-phase magnetic column. As a result, the magnetic flux concentrates on the central V-phase magnetic column, and the loss (no-load loss such as hysteresis loss) generated in the core increases. That is, in conventional static electromagnetic equipment using three-phase five-leg cores, there is a technical problem of partial overheating of the center V-phase core in particular due to increase in no-load loss due to concentration of magnetic flux.

On the other hand, in Patent Documents 1 and 2, there is no description about the core of the magnetic column whose magnetic flux is concentrated in the center of the V-phase and the technical problem of local overheating of the core due to no-load loss. In addition, Patent Document 2 discloses magnetic shields 20 , 22 , and 21 as components structurally similar to the additional iron core 2 (see FIG. 1 , etc.) described in detail in the embodiment of the present invention. However, the magnetic shields 20, 22, and 21 are used to reduce stray loss caused by leakage flux and prevent overheating of the iron core clamps 17, 18, etc., and are not used to relax the magnetic flux to three-phase five The central core of the column core concentrates and prevents it from overheating.

prior art literature

patent documents

Patent Document 1: Japanese Patent Laid-Open No. 2003-133141

Patent Document 2: Japanese Unexamined Patent Publication No. 2002-075752

Contents of the invention

The technical problem to be solved by the invention

In view of the problems of the prior art as above, the object of the present invention is to provide a three-phase five-leg type iron core capable of alleviating the concentration of magnetic flux generated by a three-phase AC coil on the central iron core and preventing the iron core from overheating. And a static electromagnetic device using the three-phase five-column iron core.

Technical solutions for problem solving

The invention's three-phase five-column iron core is characterized in that it includes: a winding iron core group, which is composed of four substantially rectangular ring-shaped winding iron cores formed by overlapping layers of thin strip-shaped magnetic materials, so as to mutually adjacent winding iron cores are arranged in a row so that their outer peripheral portions are in contact with each other; and a second iron core is attached and fixed to a side surface portion of a yoke portion via an insulating member, wherein the yoke portion It refers to the parts other than the iron core parts constituting the three magnetic columns among the iron core parts of the individual wound iron cores constituting the above-mentioned wound iron core group. The outer peripheral parts of the cores are in contact with each other and coils are wound.

The effect of the invention

According to the present invention, it is possible to provide a three-phase five-leg type iron core and a static electromagnetic device using the three-phase five-leg type iron core, which can relax the concentration of the magnetic flux generated by the three-phase alternating current coil on the central iron core, The iron core can thereby be prevented from overheating.

Description of drawings

FIG. 1 is an example of a perspective view showing the structure of a three-phase five-leg type iron core according to a first embodiment of the present invention.

FIG. 2 is an example of a perspective view of a static electromagnetic device using the three-phase five-leg iron core of FIG. 1 .

3 is a diagram schematically showing an example of a cross-sectional structure of a yoke portion of a wound iron core including an additional iron core located at the upper edge of the stationary electromagnetic device in FIG. 2 .

4 is a view showing another example of clamping and fixing the wound core and the additional core based on the example of the cross-sectional structure of the yoke portion at the upper edge of the stationary electromagnetic device in FIG. 3 .

5 is an example of a vertical cross-sectional view of the upper half of a static electromagnetic device with a three-phase five-leg type iron core used as an object of three-dimensional electromagnetic field simulation analysis.

FIG. 6 is a diagram showing an example of the results of three-dimensional electromagnetic field simulation analysis.

FIG. 7 is a diagram showing another example of the results of three-dimensional electromagnetic field simulation analysis.

8 is an example of a perspective view showing the structure of a three-phase five-leg type iron core according to a second embodiment of the present invention.

9 is an example of a perspective view showing the structure of a three-phase five-leg type iron core according to a third embodiment of the present invention.

Explanation of reference signs

1 wound core,

1a unit wound core,

2, 2a, 2b additional iron core (second iron core),

3 strapping parts,

4a high voltage coil,

4b Low voltage coil,

5a high voltage electrodes,

5b low voltage electrodes,

6, 6a insulating parts,

7 fixing parts,

8 studs,

10, 10a, 10b Three-phase five-column iron core,

20 Stationary electromagnetic equipment.

detailed description

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 the common component, and the overlapping description is abbreviate|omitted.

(first embodiment)

1 is an example of a perspective view showing the structure of a three-phase five-leg type iron core 10 according to the first embodiment of the present invention, and FIG. 2 is a perspective view showing a stationary electromagnetic device 20 using the three-phase five-leg type iron core 10 of FIG. 1 . example of. In addition, in the present embodiment, for convenience of description, the stationary electromagnetic device 20 is a transformer for three-phase AC, but it may be a reactor or the like for three-phase AC.

As shown in FIG. 1 , the three-phase five-pillar core 10 of the present embodiment is configured in a ladder shape by arranging four substantially rectangular ring-shaped wound cores 1 . Here, the wound iron core 1 is formed by laminating thin strip-shaped magnetic materials made of ultra-thin electrical steel sheets, amorphous, nanocrystalline alloys, etc. in multiple layers. 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 wound cores 1 adjacent to each other in the left-right direction are arranged in a row. The outer peripheral parts are arranged so as to be in contact with each other. That is, four wound iron cores 1 are arranged on one surface in a row in the horizontal direction in a ladder shape. In addition, in this specification, up, down, front, back, left, and right are used as a term which shows a direction, and these directions refer to the direction of the arrow shown to the lower left in FIG. 1, for example. In addition, in the present embodiment, the three-phase five-leg type iron core 10 is characterized by further including the additional iron core 2 as the second iron core, and details of the additional iron core 2 will be described later.

In addition, in FIG. 1 , each wound core 1 is shown as a structure in which two unit wound cores 1 a have side surfaces facing each other joined via an insulating member 6 to form an integrated structure. Thus, in the present embodiment, the wound core 1 may have a structure in which a plurality of unit wound cores 1a are joined with the side faces facing each other via the insulating member 6, or may be formed by only one unit wound core 1a. A structure consisting of a unit wound core 1a.

Here, among the core parts of the four wound cores 1 arranged in a row, the core parts (indicated as U phase, V phase and The W-phase part) is called a magnetic column because the low-voltage coil 4b and the high-voltage coil 4a are wound around it as shown in FIG. 2 . On the other hand, among the core portions of the four wound cores 1 arranged in a row, the portion that is not a magnetic column is called a yoke portion.

In the present embodiment, as shown in FIGS. 1 and 2 , an approximately rectangular ring-shaped additional core 2 is provided on the side surface of the yoke portion of four wound cores 1 arranged in a row. That is, the additional iron core 2 is provided so as to make one round around the upper and lower edge yoke portions of the four wound iron cores 1 and the left and right yoke portions of the two end portions of the wound iron core 1 .

Here, like the wound core 1, the additional iron core 2 is formed by laminating a plurality of strip-shaped magnetic materials made of ultra-thin electrical steel sheets, amorphous, nanocrystalline alloys, and the like. Furthermore, the thin strip of the thin strip-shaped magnetic material forming the yoke portion of the wound iron core 1 and the thin strip-shaped magnetic material forming the additional iron core 2 provided on the side surface of the yoke portion of the wound iron core 1 In the thin strips, the directions of the respective thin strips are the same and the surfaces of the thin strips are substantially parallel. In this way, the magnetic flux in the wound core 1 easily flows into the additional core 2 .

Further, an insulating member 6a (refer to FIG. 3, not shown in FIG. 1 and FIG. 2 ) is interposed between the additional iron core 2 and the side surface of the yoke part of the wound iron core 1, and the wound iron core 1 and the insulated The member 6a and the additional iron core 2 are integrally clamped and fixed by a rope-shaped or tape-shaped binding member 3 (in FIG. 1 and the like, the binding member 3 is shown in the form of a rope). The binding member 3 for clamping and fixing is made of non-magnetic metal, resin, plastic, glass fiber, or the like.

In addition, in Fig. 1 and Fig. 2, there are 12 binding parts 3 in total, but in fact, as long as the binding parts are fixed in an appropriate number according to the size of the static electromagnetic device 20 and the weight of the wound iron core 1, the appropriate strength can be maintained. That is, the material and quantity thereof are not limited. In addition, the insulating member 6a is provided in order to suppress the eddy current between the wound core 1 and the additional iron core 2, and the insulating member 6a may not be necessary.

Further, as shown in FIG. 2 , the stationary electromagnetic device 20 is constituted by winding a low-voltage coil 4 b and a high-voltage coil 4 a with magnetic columns indicated as U-phase, V-phase, and W-phase in FIG. 1 . Moreover, the voltage electrode 5b and the high voltage electrode 5a are provided in these low voltage coil 4b and the high voltage coil 4a, respectively. However, in the perspective view of FIG. 2, the high-voltage electrodes 5a are arranged on the inner side of the three-phase five-leg type iron core 10, and are not shown because they cannot be seen (refer to FIG. 3).

In addition, the stationary electromagnetic device 20 is fabricated, for example, by arranging four wound iron cores 1 having junctions such as lapping/butting, and starting from the wound iron cores corresponding to the magnetic columns of the U-phase, V-phase, and W-phase. The open end of the core 1 is inserted into the low-voltage coil 4b and the high-voltage coil 4a, and then the open end of each wound core 1 is closed (see Patent Document 1, etc.). Therefore, the three-phase five-column iron core 10 and the static electromagnetic device 20 are manufactured almost simultaneously.

3 is a diagram schematically showing an example of the cross-sectional structure of the yoke portion of the wound iron core 1 including the additional iron core 2 at the upper edge of the stationary electromagnetic device 20 of FIG. An example of the cross-sectional structure of the vicinity of the binding member 3. In Fig. 3, the binding member 3 is indicated by a dotted line, and the cross-sectional shape of the low-voltage coil 4b and the high-voltage coil 4a located in the front or rear of the cross-sectional position is indicated by a long dotted line, and the voltage electrode 5b and the high-voltage electrode 5a are indicated by a thick line. Dotted lines indicate.

The unit wound core 1a is constituted 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 are in close contact with each other via an insulating member 6 having a thickness G2. Furthermore, the additional iron core 2 formed by stacking thin strip-shaped magnetic materials with a width W so as to have a thickness C is in close contact with the two unit wound cores 1 a via an insulating member 6 a with a thickness G. Two sides of the iron core 1 are wound. Moreover, the binding member 3 of rope shape or tape shape is provided so that the wound iron core 1 and the additional iron core 2 may be surrounded, and these wound iron core 1 and the additional iron core 2 are pinched and fixed.

Here, as long as the width W of the additional core 2 is smaller than the protruding amount D of the low-voltage coil 4b and the high-voltage coil 4a from the wound core 1, the volume of the housing of the static electromagnetic device 20 will not increase. In addition, in FIG. 3 , although the thickness C of the additional iron core 2 is shown as being equal to the winding thickness C2 of the wound iron core 1, as long as the insulation distance from the low-voltage electrode 5b can be appropriately ensured, it can also be compared to The winding thickness C2 may be smaller than the winding thickness C2 conversely if there is a margin in the size of the housing.

In addition, as shown in FIG. 3, a pair of low-voltage electrodes 5b connected to the low-voltage coil 4b are bent in order to ensure an insulating distance from the additional iron core 2. The yoke portion is drawn upward compared to the yoke portion. In addition, here, in order to reduce Joule's heat caused by a large current, the low-voltage coil 4b is wound inside the high-voltage coil 4a.

FIG. 4 is a diagram showing another example of clamping and fixing the wound core 1 and the additional core 2 based on the example of the cross-sectional structure of the yoke portion at the upper edge of the stationary electromagnetic device 20 in FIG. 3 . In this example, a plate-shaped fixture 7 and a stud bolt 8 are used instead of the binding member 3 as members for clamping and fixing the wound core 1 and the additional core 2 .

As shown in FIG. 4 , a pair of stators 7 are provided on the outer side surfaces of the two additional iron cores 2 provided on the two side surfaces of the two wound iron cores 1 via the insulating member 6 a. Moreover, the pair of fixing pieces 7 are connected by at least two stud bolts 8 . Therefore, by clamping the stud bolts 8 , a pair of fixtures 7 press the additional iron core 2 from the outside, and the additional iron core 2 is clamped and fixed to the wound iron core 1 .

Next, the effects of the present embodiment will be described using the results of three-dimensional electromagnetic field simulation analysis. FIG. 5 is an example of a vertical cross-sectional view of the upper half of a static electromagnetic device 20 of a three-phase five-leg type iron core used as an object of three-dimensional electromagnetic field simulation analysis. In addition, the so-called three-phase five-column core 20 here is a transformer. In addition, in this three-dimensional electromagnetic field simulation analysis, considering the vertical symmetry of the shape of the static electromagnetic device 20 of the three-phase five-column type iron core, a 1/2 cut-away model of only the upper half from the center of the magnetic column is implemented. Electromagnetic field analysis and calculation. In addition, in this 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 simulation analysis, it is assumed that the material constituting the wound core 1 and the additional core 2 is an amorphous alloy with a saturation magnetic flux density of 1.63T (specifically, 2605HB1M type amorphous alloy manufactured by Hitachi Metals, Ltd.) characteristics. In addition, various dimensions which define the sizes of the wound core 1 and the additional core 2 constituting the stationary electromagnetic device 20 are as shown in Table 1 below.

[Table 1]

reference sign Dimensions (mm) reference sign Dimensions (mm) C 104 L 216 C2 104 G2 25 W 50 G3 8 W2 171 S 1,790 h 532 E1 284 H2 397 E2 183

In the above Table 1 and FIG. 5 , the reference symbol H representing the dimension represents the half value of the thickness of the wound iron core 1, and the reference symbol H2 represents the height of the low-voltage coil 4b and the high-voltage coil 4a wound on three magnetic columns. placement. In addition, the reference sign E1 indicates the internal dimensions along the arrangement direction of the inner two wound iron cores 1 among the above-mentioned four wound iron cores 1 shown in FIG. ) The internal dimensions of the winding direction of the iron core 1 in the arrangement direction. In addition, since it is necessary to wind the low-voltage coil 4b and the high-voltage coil 4a on the inner three magnetic columns, the dimension E1 is larger than the dimension E2.

Furthermore, here, the outer peripheral parts of the four wound cores 1 are not in direct contact with each other, but are connected with a slight gap G3 therebetween. Therefore, the dimension L along the arrangement direction of the wound core 1 of the three magnetic columns wound around the low-voltage coil 4b and the high-voltage coil 4a is expressed as L=2×C2+G3. Furthermore, 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, among the code|symbol shown in Table 3, the code|symbol which shows the dimension which is not shown in FIG. 5 is the same as the code|symbol shown in FIG. That is, the reference sign C indicates the thickness of the additional iron core 2, the reference sign W indicates the width of the additional iron core 2, the reference sign W2 indicates the width of the unit wound core 1a, and the reference sign G2 indicates the width between two units. The thickness of the insulating member 6 between the wound cores 1a.

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

[Table 2]

project High voltage (primary) coil Low voltage (secondary) coil Voltage 6,600V 240V electric current 50.5A 1,391A Number of turns 358 13 resistance 0.48Ω 0.0005Ω

FIG. 6 is a diagram showing an example of the results of three-dimensional electromagnetic field simulation analysis. In Fig. 6, the results of three-dimensional electromagnetic field simulation analysis are shown as a vertical line segment BB' (length 400mm: refer to Fig. 5) set above the central magnetic column (indicated as a V-phase magnetic column in Fig. 1). A graph showing the change in the magnitude of the leakage magnetic field at each position on the That is, the horizontal axis of the graph in FIG. 6 represents the position on the line segment B-B' above the central magnetic column, and the vertical axis represents the intensity H of the leakage magnetic field.

In the graph of FIG. 6 , the thickness W of the insulating member 6 a sandwiched between the wound core 1 and the additional core 2 is used as a third variable parameter. That is, the broken line 50 shown in FIG. 6 shows 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 show the thickness of the insulating member 6a when the additional iron core 2 is provided. G is the variation of the leakage magnetic field when G is 6.5mm, 1mm, and 0.2mm, respectively.

From the results of the three-dimensional electromagnetic field simulation analysis shown in FIG. 6 above, it can be known that the leakage magnetic field is the largest at point B closest to the wound core 1 , and decreases as it moves away from the wound core 1 . In addition, it can be seen that when the additional iron core 2 is provided, the leakage magnetic field is reduced to half or less compared to the case where the additional iron core 2 is not provided. Furthermore, it can be seen that the smaller the thickness G of the insulating member 6a sandwiched between the wound core 1 and the additional iron core 2, the smaller the leakage field is.

Generally, a large leakage magnetic field in static electromagnetic equipment such as a transformer indicates that magnetic flux concentration occurs in the iron core used in the static electromagnetic equipment. That is, when the magnetic flux density in the iron core increases due to concentration of magnetic flux and approaches magnetic saturation, the magnetic permeability decreases. As a result, magnetic flux easily leaks out of the iron core, and the leakage magnetic field in the peripheral region of the iron core becomes large. That is, the results shown in FIG. 6 necessarily indicate that the concentration of magnetic flux in the central magnetic column shown as the V phase in FIG. 1 is alleviated by providing the additional iron core 2 .

In addition, relaxation of the magnetic flux concentration in the central V-phase magnetic column can also be explained as follows. That is, by providing the additional iron core 2 , the magnetic resistance (reluctance) between the magnetic columns shown as the U phase and the W phase in FIG. 1 is reduced. Therefore, the magnetic flux generated in each of the U-phase and W-phase magnetic columns easily flows not only to the central V-phase magnetic column but also to the W-phase and U-phase magnetic columns on opposite sides. Thereby, the concentration of magnetic flux in the central V-phase magnetic column is alleviated.

In addition, the thinner the thickness G of the insulating member 6a sandwiched by the wound core 1 and the additional iron core 2, the smaller the leakage field. The increased reluctance is smaller, so it can be easily understood. Therefore, the smaller the thickness G of the insulating member 6a, the greater the effect of alleviating the concentration of magnetic flux in the central V-phase magnetic column.

FIG. 7 is a diagram showing another example of the results of three-dimensional electromagnetic field simulation analysis. In FIG. 7 , the horizontal axis of the graph represents the thickness G of the insulating member 6 a sandwiched between the wound core 1 and the additional core 2 , and the vertical axis represents the no-load loss Wi of the static electromagnetic device 20 (transformer) of this embodiment. Here, the no-load loss Wi is based on the magnetic flux density distribution in the whole iron core obtained by the three-dimensional electromagnetic field simulation analysis, the loss characteristics of the iron core material (the above-mentioned amorphous alloy) and the excitation conditions shown in Table 2 (where , the frequency of the coil current is 50Hz) to calculate the no-load loss generated in the entire iron core. 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 taken as 100.

The static electromagnetic device 20 (transformer) provided with the additional iron core 2 of this embodiment is heavier than the conventional transformer without the additional iron core 2 , but as shown in FIG. 7 , the no-load loss Wi is reduced. Furthermore, when the thickness G of the insulating member 6 a is 0.2 mm, the no-load loss Wi is also reduced by about 10%.

However, when the frequency of the coil current is constant, the portion of the no-load loss Wi proportional to the square of the magnetic flux is large. Therefore, it can be said that the reduction of the no-load loss Wi of the entire iron core realized by providing the additional iron core 2 means that the concentration of magnetic flux in a part of the magnetic column is alleviated. It should be noted that the part of the magnetic column referred to here is the central magnetic column shown as the V phase in FIG. 1 , as is also clear from the previous description.

As described above, according to the present embodiment, it is possible to alleviate the concentration of magnetic flux in the central V-phase magnetic column. Therefore, it is possible to prevent overheating of the central V-phase magnetic column due to concentration of magnetic flux.

(second embodiment)

Fig. 8 is an example of a perspective view showing the structure of a three-phase five-leg type iron core 10a according to a second embodiment of the present invention. As shown in FIG. 8 , the three-phase five-leg type iron core 10 a of this embodiment is the same as the three-phase five-leg type iron core 10 of the first embodiment shown in FIG. 1 except that the structure of the additional iron core 2 a is different. That is, as in the first embodiment, the three-phase five-leg core 10a is configured by arranging four winding cores 1 formed by stacking thin strip-shaped magnetic materials in multiple layers to form a substantially rectangular ring shape. On the other hand, the additional iron core 2a is formed by laminating thin strip-shaped magnetic materials in multiple layers, but has a shape of a square bar long in the strip direction of the thin strip-shaped magnetic material.

In this embodiment, four or more long square bar-shaped additional iron cores 2a are used, and each additional iron core 2a is installed on the yoke of the wound iron core 1 constituting the U-phase, V-phase, and W-phase magnetic columns. Two sides of the yoke part, the upper edge and the lower edge of the magnetic column. At this time, in the gap between the wound iron core 1 and the additional iron core 2a, an insulating member 6a (see FIG. 3, not shown in FIG. The iron core 1 and the additional iron core 2a are clamped and fixed by a rope-shaped or tape-shaped non-magnetic binding member 3 . In addition, in Fig. 8, there are 8 binding parts 3 in total, but in fact, as long as the size of the static electromagnetic equipment using the three-phase five-column type iron core 10a and the weight of the wound iron core 1 maintain an appropriate strength An appropriate number of binding members may be used, and the material and number thereof are not limited.

In the static electromagnetic equipment using the three-phase five-leg type iron core 10a configured as above, even if there is a difference in degree, the additional iron core 2a makes the reluctance between the magnetic legs shown as U-phase and W-phase Lowering this doesn't change at all. That is, since the additional iron core 2 a disperses the magnetic flux flowing into the central V-phase magnetic column to other magnetic columns, an effect of preventing overheating of the central V-phase magnetic column can be obtained also in this embodiment.

In addition, in this embodiment, the weight of the additional iron core 2a is lighter than the additional iron core 2 in 1st Embodiment. Therefore, the present embodiment is suitable for the case where the weight of stationary electromagnetic equipment is to be suppressed and for large-capacity and large-sized stationary electromagnetic equipment.

(third embodiment)

Fig. 9 is an example of a perspective view showing the structure of a three-phase five-leg type iron core 10b according to a third embodiment of the present invention. As shown in FIG. 9 , the three-phase five-leg type iron core 10 b of this embodiment is the same as the three-phase five-leg type iron core 10 of the first embodiment shown in FIG. 1 except that the structure of the additional iron core 2 b is different. That is, like the first embodiment, the three-phase five-leg type iron core 10b is configured by arranging eight wound iron cores 1 formed in a substantially rectangular ring shape by stacking thin strip-shaped magnetic materials in multiple layers. On the other hand, the additional iron core 2b is formed by laminating thin strip-shaped magnetic materials in multiple layers, but its shape is a rectangular parallelepiped.

In this embodiment, 12 additional iron cores 2b in the shape of a cuboid are used. Furthermore, each additional iron core 2b is provided on the side surface of the yoke portion of the upper edge and the lower edge of the two adjacent wound iron cores 1 constituting the U-phase, V-phase, and W-phase respective magnetic columns. The two wound cores 1 are connected to each other. At this time, in the gap between the wound iron core 1 and the additional iron core 2b, an insulating member 6a (see FIG. 3, not shown in FIG. The iron core 1 and the additional iron core 2b are clamped and fixed by a rope-shaped or tape-shaped non-magnetic binding member 3 . In addition, in Fig. 9, there are 12 binding parts 3 shown in total. In fact, as long as the size of the static electromagnetic equipment using the three-phase five-column iron core 10b and the weight of the winding iron core 1 maintain an appropriate strength, the A fixed number of binding parts can be used, and its material and quantity are not limited.

In the static electromagnetic equipment using the three-phase five-leg type iron core 10b configured as above, even if there is a difference in degree, the addition of the iron core 2b reduces the reluctance between the magnetic legs shown as the U phase and the W phase. Nothing has changed. That is, since the additional iron core 2 b disperses the magnetic flux flowing into the central V-phase magnetic column to other magnetic columns, an effect of preventing overheating of the central V-phase magnetic column can be obtained also in this embodiment.

In addition, in this embodiment, the weight of the additional iron core 2b is lighter than not only the additional iron core 2 in the first embodiment but also the additional iron core 2a in the second embodiment. Therefore, the present embodiment is suitable for reducing the weight of stationary electromagnetic equipment and for large-capacity and large-sized stationary electromagnetic equipment.

In addition, the present invention is not limited to the embodiments and modifications described above, and includes various modifications. For example, the above-mentioned embodiments and modified examples have been described in detail in order to clarify the present invention, but are not necessarily limited to include all the configurations described. In addition, a part of the structure of one embodiment/modification can be replaced with the structure of another embodiment/modification, and the structure of another embodiment/modification can also be added to the structure of one embodiment/modification. . In addition, it is possible to add, delete, or replace a part of the configuration of each embodiment/modification with respect to the configuration included in the other embodiment/modification.

Claims (6)

1. A kind of 1. three-phase five-limb iron core, it is characterised in that including：

   Wound core group, it is the winding iron for the substantially rectangular ring-type for being made up of 4 thin ribbon shaped magnetic material overlying multiple layers Core, configure in a manner of the peripheral part of mutually adjacent Wound core is in contact with each other in a row and formed；With

   Second iron core, it is mounted on the side surface part in yoke portion across insulating element, wherein, the yoke portion is composition The part in addition to the core portion for forming 3 magnetic poles in the core portion of each Wound core of the Wound core group, 3 magnetic poles are to be in contact with each other by the peripheral part of the mutually adjacent Wound core and convolute coil is formed respectively ,

   Second iron core is the iron core of rectangular-shape, will be mutually adjacent in the upper portion of 3 magnetic poles and lower section The mode that the yoke portion of the Wound core is connected to each other two-by-two, the side surface part in these yoke portions have been disposed separately 12 each other It is individual.
2. 2. three-phase five-limb iron core as claimed in claim 1, it is characterised in that：

   Second iron core is fixed on the Wound core using the nonmagnetic strapping elements of rope form or adhesive tape-like Side surface part.
3. 3. three-phase five-limb iron core as claimed in claim 1, it is characterised in that：

   The second iron core utilization is respectively arranged at the outer of second iron core of 2 side surface parts of the configuration in the Wound core The fixture of 2 side surface parts of side, and by the fixture for being arranged at 2 side surface parts of second iron core connects and clamps double Hook bolt, it is fixed on the side surface part of the Wound core.
4. 4. three-phase five-limb iron core as claimed in claim 1, it is characterised in that：

   Second iron core is the iron core for forming thin ribbon shaped magnetic material overlying multiple layers.
5. 5. three-phase five-limb iron core as claimed in claim 4, it is characterised in that：

   Form the direction of strip and the direction in face of the thin ribbon shaped magnetic material of second iron core, with composition be mounted with this second The direction of the strip of the thin ribbon shaped magnetic material of the Wound core of the near sites of iron core and the direction in face are roughly the same.
6. A kind of 6. stationary electromagnetic equipment, it is characterised in that：

   The line of three-phase alternating current is wound in 3 magnetic poles of three-phase five-limb iron core according to any one of claims 1 to 5 Enclose and form.