JP2019009277A - Core, core laminate, and stationary induction apparatus - Google Patents

Abstract

To provide a core, a core laminate, and a stationary induction apparatus, capable of preventing noise and positional deviation caused in a partial core.SOLUTION: A core 1 includes a plurality of partial cores 10 each including a magnetic body. End surfaces 11 and 12 of each partial core 10 have partial surfaces 11a, 11b, and 12a, 12b with different angles, respectively. The end surfaces 11, 12 of adjacent partial cores 10 have shapes that coincide with each other.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a core, a core laminate in which cores are laminated, and a static inductor having a core or a core laminate.

  A static inductor such as a transformer, a reactor, or an inductor includes a core including a magnetic material and a coil formed of a conductive wire wound around the core. For example, the core has an endless shape such as a ring shape or a track shape so as to form a closed magnetic circuit.

JP-A-2005-243805

  Here, the endless core may be configured to have a continuous configuration without a joint or may be configured by combining divided partial cores. In order to suppress leakage magnetic flux and the like, a continuous configuration is preferable. However, when a core is inserted later into a coil wound in advance, the core needs to be divided into a plurality of partial cores. Moreover, when it is desired to obtain a desired performance by providing a gap in the core, a divided configuration with a plurality of partial cores is used (see Patent Document 1).

  However, in such partial cores, end faces of adjacent partial cores are in direct contact with each other or face each other through a gap. At this time, if the positions of the end faces are not stable, noise generated by the magnetic attractive force and the repulsive force acting between the end faces increases. And when a shift | offset | difference generate | occur | produces between end surfaces, the overlapping area of end surfaces will reduce. Then, since the cross-sectional area of the magnetic path decreases, there is a possibility that the magnetic resistance increases and the desired performance cannot be obtained. In addition, the leakage magnetic flux increases in the portion that protrudes from the overlapping portion, resulting in a deterioration in characteristics.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a core, a core laminate, and a stationary inductor that can prevent noise and displacement generated in a partial core. is there.

  The core of the present invention has a plurality of partial cores containing a magnetic material, the end surfaces of the partial cores have partial surfaces with different angles, and the end surfaces of the adjacent partial cores have shapes that match each other. .

  In the core laminate of the present invention, one end surface of each partial core has a protruding portion protruding toward the adjacent partial core, and the other end surface of each partial core is the protruding portion of the adjacent partial core. A plurality of cores having recesses into which the cores fit are stacked, and in the cores adjacent in the stacking direction, the protrusions and the recesses are opposite to each other.

  Furthermore, the static inductor of this invention has the said core or the said core laminated body, and the coil wound around the said core or the said core laminated body.

  ADVANTAGE OF THE INVENTION According to this invention, the core which can prevent the noise and position shift which generate | occur | produce in a partial core, a core laminated body, and a stationary inductor can be provided.

It is a perspective view of the core which concerns on embodiment. It is a disassembled perspective view of the core which concerns on embodiment. It is a top view of the core concerning an embodiment. It is a perspective view of the core laminated body which laminated | stacked the core which concerns on embodiment. It is a disassembled perspective view of the core laminated body which laminated | stacked the core which concerns on embodiment. It is a perspective view showing a reactor using a core layered product concerning an embodiment. It is a perspective view which shows the coil of a reactor. It is a perspective view which shows insertion of the partial core to a coil. It is a partially transparent top view (A) of a reactor, and a side view (B). It is the top view (A) which shows the core laminated body of the comparative example 1, and a side view (B). 10 is a plan view showing a core of Comparative Example 2. FIG. FIG. 3 is a plan view (A) showing the core of Example 1 and a plan view (B) showing the core of Example 2. FIG. It is a top view which shows a track-shaped core. It is a top view which shows E core. It is a top view which shows the example of the end surface of a partial core. It is a top view which shows the example which provided the shoulder part of the end surface of a partial core. FIG. 17 is a partial perspective view of FIG. 16. It is a perspective view which shows the example which provided the shoulder part of the end surface of a partial core. It is a side view which shows the example of the end surface of a partial core.

Embodiments of the present invention will be described below with reference to the drawings.
[Constitution]
[core]
As shown in FIG. 1, the core 1 has a plurality of partial cores 10 including a magnetic body. As shown in FIG. 2, the plurality of partial cores 10 are endless when the end surfaces 11, 12 match each other. The endless shape is a closed shape having no end portion as a whole. In the present embodiment, the endless shape formed by the core 1 is a circular ring shape. Each partial core 10 has an arc shape with a substantially rectangular cross section.

  In the following description, the radial direction of the core 1 is the X direction, and the thickness direction of the core 1 orthogonal to the radial direction is the Y direction. The direction along the endless shape of the core 1, that is, the tangential direction of the circle is defined as the Z direction. When the core 1 is placed horizontally so that the radial direction is horizontal, the radial direction is the width direction and the thickness direction is the height direction. However, the direction when the core 1 is mounted on the actual machine is not limited to the horizontal orientation.

  The plurality of partial cores 10 constituting the core 1 are members including a magnetic body. In the present embodiment, the partial core 10 is a powder magnetic core. The dust core is manufactured by compressing and molding a material containing magnetic powder with a mold at a high pressure.

  Each partial core 10 has a substantially rectangular cross section, and has an arcuate upper surface 10a, bottom surface 10b, inner peripheral surface 10c, and outer peripheral surface 10d. The upper surface 10a refers to a surface far from the bottom surface of the case when the core 1 is accommodated in the case or the like, and the bottom surface 10b refers to a surface opposite to the upper surface 10a. However, the actual vertical and horizontal positional relationship between the top surface 10a and the bottom surface 10b of the partial core 10 varies depending on the direction in which the core 1 is mounted on the actual machine. The inner peripheral surface 10 c is a curved surface that forms the inner periphery of the core 1, and the outer peripheral surface 10 d is a curved surface that forms the outer periphery of the core 1. The corners of the top surface 10a, the inner peripheral surface 10c, and the outer peripheral surface 10d, and the corners of the bottom surface 10b, the inner peripheral surface 10c, and the outer peripheral surface 10d are chamfered.

  Each partial core 10 has end faces 11 and 12 at both ends. One end surface 11 has partial surfaces 11a and 11b having different angles, and the other end surface 12 also has partial surfaces 12a and 12b having different angles. In this embodiment, the partial surfaces 11a, 11b, 12a, and 12b having different angles are a plurality of planes having different angles. In the present embodiment, one end surface 11 of the partial core 10 has a protruding portion 110 protruding toward the adjacent partial core 10, and the other end surface 12 fits into the protruding portion 110 of the adjacent partial core 10. A recess 120 is provided.

  More specifically, the end surfaces 11 and 12 include partial surfaces 11a, 11b, 12a, and 12b that form a substantially V shape. The partial surfaces 11a and 11b that form one end surface 11 form a protruding portion 110 that protrudes so that the radial cross section is V-shaped. The partial surfaces 12a and 12b that form the other end surface 12 form a recessed portion 120 that is recessed so that the radial cross section is V-shaped. The angle formed by the V-shapes of the partial surfaces 11a and 11b and the angle formed by the partial surfaces 12a and 12b are substantially the same, and the areas of the partial surfaces 11a and 11b are substantially the same as the areas of the partial surfaces 12a and 12b. .

  The end faces 11 and 12 of the adjacent partial cores 10 have shapes that match each other. The shape that matches each other means a shape in which substantially the entire end surfaces 11 and 12 can overlap each other. It suffices that the end surfaces 11 and 12 are formed in a shape that allows the substantially entire surfaces to overlap each other, and when they are matched with reality, a slight protrusion or the like may occur. In addition, the case where substantially the entire surface overlaps includes a case where a portion that does not overlap slightly occurs due to chamfering or rounding of a corner, or a case where a slight difference occurs in the size of the overlapping surfaces due to a manufacturing error or the like. . In the present embodiment, the projecting portions 110 formed by the partial surfaces 11a and 11b are fitted into the recessed portions 120 formed by the partial surfaces 12a and 12b, so that the end surfaces 11 and 12 are matched.

  When the end surface 11 and the end surface 12 of the partial core 10 are matched, the top surface 10a, the bottom surface 10b, the inner peripheral surface 10c, and the outer peripheral surface 10d, which are the surfaces of the partial core 10, are high so that no leakage magnetic flux is generated. Is a continuous surface, so-called flush. However, since it is impossible to completely eliminate the boundary between the end faces 11 and 12, the presence of minute grooves and gaps is allowed. It is allowed that slight grooves or gaps are generated due to corner chamfering or rounding. As will be described later, when the core 1 is incorporated in a stationary inductor, the end surface 11 and the end surface 12 of the partial core 10 are bonded by an adhesive R (see FIG. 9).

  The end surfaces 11 and 12 of the adjacent partial cores 10 become regulation surfaces that regulate movement of the partial cores 10 by matching each other. That is, as shown in FIG. 3, when the end faces 11 and 12 are matched, movement in the direction in which the partial cores 10 collide, that is, the direction indicated by the white arrow is regulated. Further, as indicated by black arrows, the movement of the partial surface 11a inward and the movement of the partial surface 12a outward are restricted, and the movement of the partial surface 11b outward and the partial surface 12b Inward movement is restricted. For this reason, the shift | offset | difference to a XZ direction is prevented. Since this relationship occurs at both ends of the partial core 10, the position of the partial core 10 in the horizontal direction is more firmly maintained.

  As shown in FIG. 2, the end faces 11 and 12 of the partial core 10 are formed in parallel with the thickness direction, that is, the Y direction. That is, as described above, the partial surfaces 11a and 11b have different angles and the partial surfaces 12a and 12b have different angles, but all the partial surfaces 11a, 11b, 12a, and 12b are parallel to the Y direction. It is common in that. Therefore, for example, when the core 1 is placed horizontally, all the partial surfaces 11a, 11b, 12a, 12b are in the vertical direction. For example, when the partial core 10 is formed by a mold, the mold can be removed in the thickness direction.

  Furthermore, each partial core 10 has a common shape. For example, as described above, each of the partial cores 10 has the end surface 11 at one end as the protruding portion 110 and the other end surface 12 as the recessed portion 120 into which the protruding portion 110 fits. That is, the relationship between the concavities and convexities at both ends that are fitted to each other is reversed so that if one of the both ends of the partial core 10 is convex, the other is concave. Thereby, all the shape of the some partial core 10 can be made the same.

[Core laminate]
The core 1 as described above can be used alone or as a reactor core, but in the present embodiment, as shown in FIG. 4, the core 1 is used as a core laminate S in which a plurality of cores 1 are laminated. The core laminate S is configured by laminating three cores 1 coaxially in the Y direction. The plurality of cores 1 are laminated in this way even when it is difficult to form a single core 1 with a size for obtaining desired characteristics. This is because the same characteristics can be obtained.

  For example, when the core 1 is a dust core, in order to form the core 1 having a large thickness, a large press facility is required and costs are increased. In addition, when the thickness is large, when the core 1 is removed from the mold, the area in which the core 1 slides on the mold increases, and the sliding surface is more likely to be scratched compared with the case where the thickness is small, and the characteristics are improved. It will cause a drop. For this reason, although it is possible to make the core 1 with a large thickness, the single core 1 has a characteristic equivalent to the core 1 with a large thickness by suppressing the thickness to a certain extent and laminating them. A method of obtaining is conceivable. As an example, when the thickness is about 25 mm and the core 1 having a thickness of 50 mm or more is desired, two or more cores 1 are laminated.

  In the core laminated body S, as shown in FIG. 5, the cores 1 adjacent to each other in the laminating direction have the protruding portions 110 and the recessed portions 120 opposite to each other. That is, the direction of the protrusion 110 of the end surface 11 and the direction of the recess of the recessed portion of the end surface 12 are opposite in the overlapping direction.

[Static inductor]
A reactor using the core 1 as described above will be described with reference to FIGS. As shown in FIG. 6, the reactor includes coils 21 and 22 into which the core laminate S as described above is inserted.

  The coils 21 and 22 are linear or strip-shaped conductors that are wound with insulation coating. In the present embodiment, as shown in FIG. 7, edgewise coils are used as the coils 21 and 22. An edgewise coil is a coil in which a space factor and heat dissipation are improved by winding a strip-shaped rectangular wire in the width direction.

  It is difficult to wind the edgewise coil around the endless core 1 later. For this reason, as shown in FIG. 8, the laminated partial cores 10 are inserted into the coil 21 wound in advance. Similarly, the partial core 10 is also inserted into the coil 22. Then, as shown in FIG. 9, the core laminated body 10 is bonded by bonding with the adhesive R in a state where the end faces 11 and 12 of the pair of partial cores 10 are exposed from the coils 21 and 22. Form. The matched portion does not need to be exposed, and the coils 21 and 22 may be moved and accommodated in the coils 21 and 22.

  The core laminate 10 may be fixed in the coils 21 and 22 by filling with a resin. Moreover, the core laminated body 10 is good also as an aspect inserted in the coils 21 and 22 in the state accommodated in the cylindrical core case. In this case, in a state in which the three partial cores 10 are accommodated in one of the divided core cases, the core case is inserted into the coil 21, and the other three partial cores 10 are accommodated in the other of the core cases. The core case is inserted into the coil 22, the partial cores 10 are matched with each other through the adhesive R, and the core cases are combined.

[Function and effect]
(1) The core 1 which concerns on this embodiment has the some partial core 10 containing a magnetic body, and the end surfaces 11 and 12 of the partial core 10 have the partial surfaces 11a, 11b, 12a, and 12b of a different angle. The end faces 11 and 12 of the adjacent partial cores 10 have shapes that match each other.

  As a result, the end surface 11 having the partial surfaces 11a and 11b at different angles and the end surface 12 having the partial surfaces 12a and 12b are matched, so that the entire surface is matched with a flat cross section of one angle. Deviation in the direction of is prevented. Further, the overlapping area is enlarged as compared with the case where the cross section is not inclined. For this reason, the positions of the end surfaces 11 and 12 are stabilized, and noise generated by the magnetic attractive force and the repulsive force acting between the end surfaces 11 and 12 is reduced. Moreover, since it is difficult for the end faces 11 and 12 to deviate from each other, an increase in magnetic resistance due to a decrease in the overlapping area is prevented, and generation of leakage magnetic flux due to the occurrence of a protruding portion is prevented, thereby preventing deterioration in characteristics.

  For example, as shown in FIG. 10, a ring-shaped core C having the same size as that of the present embodiment is divided by partial cores C1 and C2, and end faces T1 and T2 of the cores C1 and C2 are along the diameter. In the case of flat surfaces cut in the thickness direction, the flat surfaces at one angle only touch each other. For this reason, movement in the X direction and the Y direction is allowed, and a shift is likely to occur.

  When the core C is inserted into the coils 21 and 22 and configured as a reactor, when the end surfaces 11 and 12 are as shown in FIG. 10, the overlapping area is small, and the positions of the end surfaces 11 and 12 are not stabilized. The noise generated by the magnetic attractive force and repulsive force acting on the surface increases. For example, noise generated when used at a frequency of 18 kHz to 20 kHz reaches about 60 dB to 70 dB. On the other hand, this embodiment can reduce the noise to about 40 dB in a state where it is configured as a reactor. As shown in FIGS. 11A and 11B, even when the end faces T1 and T2 are cut in a direction inclined with respect to the diameter, they are configured by one flat surface. Deviation in the direction along the flat surface is likely to occur and is not stable, leading to an increase in noise. On the other hand, in this embodiment, since the end surfaces 11 and 12 which have the partial surfaces 11a, 11b, 12a, and 12b of a different angle are matched, a position is stabilized and noise is reduced.

(2) The plurality of partial cores 10 are formed in an endless shape by matching with each other. For this reason, the plurality of partial cores 10 coincide with the adjacent partial cores 10 at both ends, and the positions of the partial cores 10 are more stable.

(3) The end face 11 is parallel to the thickness direction of the partial core 10. For this reason, when the partial core 10 is formed by a mold, the mold can be smoothly removed in the thickness direction, so that the mold can be simplified and the manufacturing cost can be suppressed.

  For example, when the partial core 10 is endless and a bent portion is generated in the partial core 10, it is not possible to perform die cutting in the radial direction of the partial core 10, and it is necessary to perform die cutting in the thickness direction. At this time, even if the end surfaces 11 and 12 have partial surfaces 11a, 11b, 12a, and 12b having different angles, the die can be removed because they are parallel to the thickness direction.

(4) The end surfaces 11 and 12 of the partial core 10 include partial surfaces 11a, 11b, 12a, and 12b that form a substantially V-shape. For this reason, when the end surfaces 11 and 12 of the pair of partial cores 10 are opposed to each other so that the substantially V-shaped unevenness is matched, the partial surfaces 11a are not affected even if the partial cores 10 are slightly displaced. , 11b and the slopes of the partial surfaces 12a, 12b are positioned and fitted together, so that the core component 1 can be assembled easily and accurately.

(5) A plurality of partial cores 10 having a common shape are included. For this reason, manufacture becomes easy and manufacturing cost can be held down. For example, when the partial core 10 is formed by a mold, it is only necessary to use a common mold, so that an increase in manufacturing cost can be suppressed.

(6) One end surface 11 of each partial core 10 has a protruding portion 110 protruding toward the adjacent partial core 10, and the other end surface 12 of each partial core 10 is the protruding portion 110 of the adjacent partial core 10. Has a recess 120 that fits in. For this reason, even when it is set as the structure assembled by the agreement of the protrusion part 110 and the hollow part 120, the one end surface 11 of the single partial core 10 is made into the protrusion part 110, and the other end surface 12 is made into the hollow part 120. By doing, the shape of the partial core 10 can be made common.

(7) In the core laminated body of the embodiment, a plurality of core parts 10 are laminated, and the core parts 10 adjacent in the laminating direction have protrusions and depressions opposite to each other. For example, when the protrusion 110 formed by the partial surfaces 11a and 11b of the end surface 11 and the recess 120 formed by the partial surfaces 12a and 12b of the end surface 12 coincide in the overlapping direction. The movement of the partial core 10 in the Y direction is not regulated, and there is a possibility that a deviation occurs. Therefore, by reversing the relationship between the projecting portion 110 and the recessed portion 120 in the overlapping direction, the boundaries between the end surfaces 11 and 12 do not coincide with each other, and therefore, the upper surface 10a and the bottom surface 10b of the partial core 10 move in the Y direction. Movement is restricted.

[Example]
The comparison of the cross-sectional area of the comparative example which made the end surface of the partial core a single flat surface, and the Example which made the partial surface from which an angle differs is shown. In Comparative Example 1, as shown in FIG. 10, the end surfaces T1 and T2 are flat cross sections cut in the Y direction along the diameter of the core C, and the cross sectional area is 249.98 mm ^2. . As shown in FIGS. 11 (A) and 11 (B), Comparative Example 2 is a core C having the same size and shape as FIG. 10 and has a single inclined surface with α = 130 ° with respect to the diameter. This is an example in which the cross-sectional area is 511.16 mm ² .

On the other hand, Example 1 is an example in which the end surface is a V-shaped partial surface whose inner angle is β = 56 °, as shown in FIG. In Example 1, the cross-sectional area was 606.88 mm ² , which was expanded to about 243% as compared with Comparative Example 1. Moreover, it expanded to about 119% compared with the comparative example 2. Further, in the second embodiment, as shown in FIG. 12B, the end surface is a V-shaped partial surface having an inner angle of 90 °. In Example 2, the cross-sectional area is 350 mm ² and the cross-sectional area is larger than that of Comparative Example 1, but the cross-sectional area is smaller than that of Comparative Example 2. However, as described above, the V-shaped shape restricts movement in directions in which the end faces are different from each other, and thus is less likely to be displaced. Thus, the inner angle of the V shape when the end surface is V-shaped is preferably 56 ° to 90 °. However, the present invention is not limited to this range.

[Other Embodiments]
The present invention is not limited to the above embodiment, and includes other embodiments described below. Moreover, the present invention also includes a form in which the above embodiment and the following other embodiments are all or any combination thereof. Furthermore, various omissions, replacements, and modifications can be made to these embodiments without departing from the scope of the invention, and modifications thereof are also included in the present invention.

(1) The shape of the core is not limited to the aspect shown in the above embodiment. The endless shape includes an annular shape or a cylindrical shape. The endless shape may be a shape having only a curved portion or a shape in which any of a curved portion, a corner portion, and a straight portion is combined. For example, an annular shape, a cylindrical shape, a polygonal annular shape, and a polygonal cylindrical shape are included in an endless manner. A track shape, an elliptical annular shape or a cylindrical shape is also included in an endless shape. The polygonal shape includes an aspect in which corners are rounded. As shown in FIG. 13, the track-shaped core 1 has a shape in which a pair of partial circles are opposed to each other with the convex side being opposed to each other, and both ends are connected by parallel straight lines. The endless shape may have legs that connect the inside. For example, as shown in FIGS. 14A and 14B, the core 1 may have a so-called E-core shape that forms a closed magnetic circuit.

  In addition, the endless shape should just be an endless core as a whole, and the partial core which comprises a core has an end surface. Moreover, even if it is a closed magnetic circuit, when the end surfaces of adjacent partial cores match, the end surfaces may be in contact, but a part or the whole of the end surfaces may not be in direct contact. Further, a gap that does not hinder the formation of the magnetic path of the core may be formed between the matched end faces. Other materials may be interposed in part or all between the matched end faces. For example, an insulating connecting member such as a spacer may be interposed, or an adhesive R may be interposed as shown in FIG.

(2) As for the shape of the partial core, various modes according to the shape of the core and the number of divisions can be considered. In the above embodiment, the shape is semicircular, but it may be U-shaped, E-shaped, or I-shaped. For example, in the case of the track-shaped core 1 as shown in FIG. 13, as shown in FIG. 13A, a combination of a pair of U-shaped partial cores 10 may be used, or as shown in FIG. Thus, a combination of the U-shaped and I-shaped partial cores 10 may be used. Also in this case, it is preferable that the U-shaped partial core 10 has a common shape and the I-shaped partial core 10 has a common shape.

  Further, in the case of the E core as shown in FIG. 14, as shown in FIG. 14 (A), a combination of a pair of E-shaped partial cores 10 may be used, or as shown in FIG. 14 (B), A combination of E-shaped and I-shaped partial cores 10 may be used.

(3) The end surface shape of the partial core 10 should just have the partial surface of a different angle. When the partial surface is a plurality of planes, the boundaries between the plurality of planes may form corners or may be rounded. Furthermore, the partial surfaces with different angles may be curved surfaces with continuously changing angles. For example, as shown in FIG. 15 (A), it may have a rectangular uneven shape that fits each other, or may have a stepped shape or a crank shape that fits each other as shown in FIG. 15 (B). However, as shown in FIG. 15C, it may be W-shaped or corrugated. A plurality of protrusions 110 and recesses 120 may have a plurality of unevenness relationships.

  Also, as shown in FIGS. 16 (A), (B), (C), and FIGS. 17 (A), (B), (C), both edge portions in the radial direction of the protruding portion 110 and the recessed portion 120 on the end surface Further, shoulder portions 11s and 12s, which are partial surfaces of a flat surface parallel to the radial direction, may be provided. As a result, the edge portions of the end surfaces 11 and 12 are not thin and sharpened, so that the edge portion is prevented from being chipped, and a surface having a continuous outer periphery is easily formed when they match.

  FIGS. 16A and 17A are examples of a shape in which a rectangular parallelepiped protrusion 110 and a recess 120 are fitted by three partial surfaces 11a, 11b, and 11c whose end surfaces 11 are orthogonal to each other. FIGS. 16B and 17B are examples of a shape in which the horizontal cross section of the end face is V-shaped, that is, the triangular columnar projection 110 and the recess 120 are fitted by the two partial surfaces 11a and 11b. FIG. 16C and FIG. 17C are examples in which the horizontal cross section of the end face is a semicircle, that is, the projecting portion 110 and the recessed portion 120 formed by the semicylindrical partial surface 11d are fitted. Since the entire end surfaces 11 and 12 are parallel to the thickness direction of the partial core 10, they have a shape that can be easily removed.

  As shown in FIGS. 18A and 18B, the shoulder portions 11s and 12s may be formed over the entire circumference of the end face. The example of FIG. 17 is superior. 16C, 17C, and 18B include a curved surface as a partial surface of the end surface. In this case, since both end surfaces easily slip along the curved surface, the angle of the pair of partial cores 10 is easily changed. For this reason, it is better to use a flat surface as the partial surface.

  Further, the plurality of partial cores 10 may have different shapes, for example, both ends of one partial core 10 may be protrusions 110, and both ends of the other partial core 10 may be depressions 120. However, the common shape has the advantage of reducing manufacturing costs, such as fewer molds to be prepared.

(4) The core is not limited to the dust core. Resin mold cores, ferrite cores, laminated steel plates, wound iron cores, and the like can also be applied. The number of core divisions, that is, the number of partial cores is not limited to two, and may be three or more. Also, the number of cores is not limited to three, and may be one, two, or four or more.

(5) The stationary inductor to which the core is applied is a reactor in the above embodiment. However, the present invention can be widely applied to any electrical device that uses electromagnetic induction generated by energizing a coil wound around a core. For example, it can be applied to a transformer and an inductor. In the above aspect, the core is inserted into the conductor wound in advance, but the winding may be an aspect in which the conductor is wound around the core. The number of coils is not limited to a specific number. A plurality of coils may or may not be connected. When connecting, they may be connected in series or in parallel.

DESCRIPTION OF SYMBOLS 1 Core 10 Partial core 10a Upper surface 10b Bottom surface 10c Inner peripheral surface 10d Outer peripheral surface 11 End surface 11a-11d Partial surface 11s Shoulder part 12 End surface 12a-12d Partial surface 12s Shoulder part 110 Protrusion part 120 Indentation part 21, 22 Coil R Adhesive S Laminated body

Claims (10)

Having a plurality of partial cores including a magnetic body;
The end surface of the partial core has partial surfaces with different angles;
End faces of the adjacent partial cores have shapes that match each other.   2. The core according to claim 1, wherein the plurality of partial cores form an endless shape by matching end surfaces with each other.   The core according to claim 1, wherein the partial surface includes planes having different angles.   The core according to any one of claims 1 to 3, wherein the end face is parallel to a thickness direction of the partial core.   5. The core according to claim 1, wherein the end surface includes a partial surface forming a substantially V-shape.   The core according to claim 1, comprising a plurality of partial cores having a common shape. One end face of each partial core has a protruding portion protruding toward the adjacent partial core,
The core according to any one of claims 1 to 6, wherein the other end face of each partial core has a hollow portion into which a protruding portion of an adjacent partial core is fitted. A plurality of cores according to claim 7 are laminated,
The cores adjacent to each other in the laminating direction have a protruding part and a recessed part opposite to each other. A core according to any one of claims 1 to 7;
A coil wound around the core;
A stationary inductor characterized by comprising: The core laminate according to claim 8,
A coil wound around the core laminate;
A stationary inductor characterized by comprising:

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