JP2011204946A - Three-phase magnetic coupling reactor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a three-phase magnetic coupling reactor which can further improve space utilization efficiency while equalizing magnetic path lengths.SOLUTION: The three-phase magnetic coupling reactor 10 is structured by including a hexahedral core 20, and a body 30 housed therein. The hexahedral core 20 is structured by including a tetrahedral cylindrical core 22 having through square holes with opening parts at both ends, and two cover part cores 26, 28 for magnetically closing the opening parts at both ends of the tetrahedral cylindrical core 22. A cubic space surrounded by the through square holes and the two cover part cores 26, 28 is a housing space 24. The body 30 is structured by including a triaxial core 40, phase coils 50 wound around the triaxial core 40, and a common gapping member 60. The triaxial core 40 is formed by arranging and integrating three shaft bodies along three axes orthogonal to each other, and includes projection parts respectively projecting from a common center part in six directions.

Description

  The present invention relates to a three-phase magnetically coupled reactor, and more particularly to a three-phase magnetically coupled reactor configured by magnetically coupling three-phase reactors to each other.

  For example, laminated iron cores used in three-phase transformers are generally arranged in the same row because of the arrangement of the coils and the like, and are therefore arranged symmetrically with respect to the three-phase coils wound for that purpose. Not. For this reason, the inductance of each phase is not the same. Therefore, various configurations for aligning the inductance and magnetic path length of each phase have been proposed.

  In Patent Document 1, as a three-phase transformer capable of reducing iron loss, three annular unit cores are arranged symmetrically about the same axis, and the other two iron cores are in contact with a part of the outer periphery. Thus, a configuration is described in which one phase winding is performed for each of two of the three annular cores, and a total of three-phase windings are described.

  In Patent Document 2, as a three-phase coil, three columnar legs are not arranged in a straight line, but are erected so as to be on the apex of a regular triangle, and each phase is placed on each of the three legs. A configuration is described in which the lengths of the magnetic paths of the three leg portions are made equal by winding a coil.

  In Patent Document 3, as a three-phase electromagnetic device, one end of six linear magnetic cores is gathered to form a star-like arrangement in a plane, and the other end is connected with an annular connecting magnetic core to form a window portion, and three directions A configuration is described in which a three-phase main winding is wound around each of the linear magnetic cores extending in a straight line and a control winding is wound around the connecting magnetic core.

JP 2005-333057 A JP 2000-150269 A JP 2008-177500 A

  In the prior art, when a three-phase reactor is magnetically coupled using a common iron core, various ideas have been made to make the inductance and magnetic path length the same. By the way, in the structure of patent document 1, it is necessary to prepare three cyclic | annular iron cores, a useless space arises, and volume efficiency or space utilization efficiency is not good. Even in the configuration of Patent Document 2, useless space is generated, and space utilization efficiency is not good. Although the configuration of Patent Document 3 is considered effective when a planar arrangement is adopted, there is a drawback in that the plane area becomes large. Thus, there is still room for improvement in improving the space utilization efficiency of the magnetically coupled reactor.

  An object of the present invention is to provide a three-phase magnetically coupled reactor that makes it possible to further improve space utilization efficiency while maintaining the same magnetic path length.

  A three-phase magnetically coupled reactor according to the present invention is wound around a triaxial core having projecting portions that project in six directions from the center along three axes orthogonal to each other, and each axis of the triaxial core. A hexahedron having a storage space capable of storing three respective phase coils and a three-axis core around which each phase coil is wound, and six inner wall surfaces facing the six projecting portions of the three-axis core And a core.

  Further, in the three-phase magnetic coupling reactor according to the present invention, the hexahedral core magnetically closes the four-sided cylindrical core including a through-square hole having openings at both ends and the openings at both ends of the four-sided cylindrical portion. And including two lid cores.

  Further, in the three-phase magnetically coupled reactor according to the present invention, six common gap bodies arranged between each of the six inner wall surfaces of the hexahedral core and each of the tip surfaces of the six projecting portions of the triaxial core. It is preferable to provide.

  With the above configuration, in the three-phase magnetically coupled reactor, each phase coil is wound around each axis of a three-axis core having projecting portions that project in six directions from the center along three axes orthogonal to each other. And the triaxial core around which each phase coil was wound is stored in the storage space of the hexahedron core, and each protrusion is arranged so as to face the six inner wall surfaces of the hexahedron core. According to such a configuration, by making the length of each axis of the three-axis core the same, the magnetic path length of each phase reactor can be made the same, and the three-dimensional space can be used effectively. Can be improved.

  Further, in the three-phase magnetically coupled reactor, the hexahedral core includes a four-surface cylindrical core including a through-square hole having openings at both ends, and two lid portions that magnetically close the openings at both ends of the four-surface cylindrical portion. Since the configuration includes the core, the operation of storing the triaxial core is easy.

  Further, in the three-phase magnetically coupled reactor, since six common gap bodies are arranged between each of the six inner wall surfaces of the hexahedral core and each of the tip surfaces of the six projecting portions of the triaxial core, It becomes easy to make the magnetic resistance including the gap of the phase reactor the same.

It is a perspective view explaining the structure of the three-phase magnetic coupling reactor of embodiment which concerns on this invention. It is a three-plane figure explaining the structure of the three-phase magnetic coupling reactor of embodiment which concerns on this invention. It is an exploded view explaining the structure of the hexahedral core of the three-phase magnetic coupling reactor of embodiment which concerns on this invention. It is an exploded view explaining the structure of the main-body part in the three-phase magnetic coupling reactor of embodiment which concerns on this invention. It is a figure explaining the mode of magnetic coupling in the three phase magnetic coupling reactor of embodiment which concerns on this invention. It is a figure explaining the mode of the magnetic coupling in the three-phase magnetic coupling reactor of a prior art.

  Embodiments according to the present invention will be described below in detail with reference to the drawings. The shapes, dimensions, materials, and the like described below are examples for explanation, and can be appropriately changed according to the specifications of the three-phase magnetic coupling reactor.

  Below, the same code | symbol is attached | subjected to the same element in all the drawings, and the overlapping description is abbreviate | omitted. In the description in the text, the symbols described before are used as necessary.

  FIG. 1 is a perspective view showing a configuration of a three-phase magnetically coupled reactor 10. FIG. 2 is a three-plane view showing the configuration of the three-phase magnetically coupled reactor 10. In these drawings, the directions of the X axis, the Y axis, and the Z axis are shown as directions of three orthogonal axes. The three-phase magnetically coupled reactor 10 includes a hexahedral core 20 and a main body 30 accommodated therein.

  In this three-phase magnetically coupled reactor 10, three reactors 32, 34, and 36 of three phases of U phase, V phase, and W phase use a triaxial core 40 and a hexahedral core 20 as a common core. Each of the phase coils 50 is wound around 40, and the triaxial core 40 and the hexahedron core 20 are magnetically integrated via a common gap body 60 to form a magnetic coupling between the three phases.

  The hexahedral core 20 is made of a magnetic material, has a cubic outer shape, and a box-shaped core having a storage space 24 in which a triaxial core 40 around which each phase coil 50 is wound can be stored. It is. FIG. 3 is an exploded view of the hexahedral core 20.

  As shown in FIG. 3, the hexahedral core 20 includes a tetrahedral cylindrical core 22 including through-holes having openings at both ends, and magnetically closes the openings at both ends of the tetrahedral cylindrical core 2. Two lid cores 26 and 28 are included. A cubic space surrounded by the penetrating square hole and the two lid cores 26 and 28 is a storage space 24.

  Since the outer shape of the hexahedral core 20 is a cube, the length of each side is the same. For example, if the length of each side of the cube is L, the length of each side of the ceiling surface or the bottom surface parallel to the XY plane of the two lid cores 26 and 28 is L, respectively. When the thickness along the Z direction of the two lid cores 26 and 28 is H, the length along the X direction and the length along the Y direction of the outer shape of the four-surface cylinder core 22 are both L. However, the height along the Z direction is (L-2H). The thicknesses of the four-side walls surrounding the storage space 24 are each H. Accordingly, the storage space 24 has the same dimension (L-2H) in the X direction, the Y direction, and the Z direction. That is, the storage space 24 is a cubic space in which each side has a dimension of (L-2H). In other words, the storage space 24 is a space surrounded by six square inner walls each having a dimension of (L-2H).

  As the four-surface cylindrical portion core 22, a laminate in which a plurality of electromagnetic steel sheets formed into a square frame shape are stacked can be used. In addition, the two lid cores 26 and 28 may be formed by laminating a plurality of electromagnetic steel plates formed in a square shape.

  The main body 30 includes a triaxial core 40, each phase coil 50 wound around the triaxial core 40, and a common gap body 60 disposed between the triaxial core 40 and the hexahedral core 20. Is done. FIG. 4 is an exploded view of the main body 30.

  The triaxial core 40 is formed by arranging and integrating three shaft bodies along three axes orthogonal to each other. In FIG. 4, a cylindrical shaft is used as three shaft bodies, and a three-axis core 40 in which the three cylindrical shafts are arranged along the X axis, the Y axis, and the Z axis is shown. Therefore, the triaxial core 40 has projecting portions 42, 43, 44, 45, 46, and 47 that project in six directions from a common central portion.

  As shown in FIG. 4, the protrusions 42 and 43 are arranged along the X axis, the protrusions 44 and 45 are arranged along the Y axis, and the protrusions 46 and 47 are along the Z axis. Be placed. The length along the X direction between the tip surfaces of the protrusions 42 and 43 on both sides across the central portion, and the length along the Y direction between the tip surfaces of the protrusions 44 and 45 on both sides across the center portion And the length along the Z direction between the front end surfaces of the projecting portions 46 and 47 on both sides across the central portion is the same. This length dimension is set to be shorter than (L-2H), which is the distance between the inner walls facing each other in the storage space 24 of the hexahedral core 20.

  By setting the dimensions of the storage space 24 of the hexahedral core 20 and the dimensions of the triaxial core 40 in this way, the triaxial core 40 can be stored in the storage space 24 of the hexahedral core 20. it can. At this time, the six inner wall surfaces of the storage space 24 of the hexahedral core 20 face the six projecting portions 42, 43, 44, 45, 46, 47 with a certain gap therebetween. This fixed gap corresponds to the thickness of the common gap body 60.

  Here, the three shaft bodies of the triaxial core 40 have been described as cylinder axes, but axes other than cylinders may be used. For example, it may be a rectangular axis, a polygonal axis, an elliptical axis, or the like. Whatever the axial shape is used, the cross-sectional shapes perpendicular to the axial direction of the six protrusions 42, 43, 44, 45, 46, 47 are all the same.

  The triaxial core 40 can be formed by laminating electromagnetic steel plates formed in a disk shape to have the outer shape described above. In addition to this, a powder molding technique using a magnetic powder as a raw material can be used. It is also possible to use one that is integrally formed with the outer shape described above. Alternatively, a magnetic material having the outer shape described above by cutting can be used.

  Each phase coil 50 is three each phase coil wound around each axis of the three-axis core 40. If these three phase coils are distinguished and referred to as U-phase coil 52, V-phase coil 54, and W-phase coil 56, they are wound around protrusions 42 and 43 along the X-axis direction in the example of FIG. The coil to be wound is the U-phase coil 52, the coil wound around the protrusions 44, 45 along the Y-axis direction is the coil wound around the V-phase coil 54, and the protrusions 46, 47 along the Z-axis direction. W-phase coil 56.

  The common gap body 60 is a non-magnetic plate material disposed on the front end surfaces of the projecting portions 42, 43, 44, 45, 46, and 47 that project in six directions. In FIG. 4, common gap bodies 62, 63, 64, 65, 66, and 67 are shown corresponding to the protrusions 42, 43, 44, 45, 46, and 47, respectively. Here, since the cross section perpendicular | vertical to the axial direction of each protrusion part is circular, the common gap body 60 has disk shape. The diameter of the disc is the same as the diameter of the axial section of each protrusion.

  As described above, when the triaxial core 40 is stored in the storage space 24 of the hexahedral core 20, the six inner wall surfaces of the hexahedral core 20 have six protrusions 42, 43, 44, 45, 46, 47, Oppose each other with a certain gap. The thickness of the common gap body 60 is set so as to correspond to this constant gap size. Thus, the triaxial core 40 can firmly contact the inner wall surface of the storage space 24 of the hexahedral core 20 with the common gap body 60 interposed therebetween. Therefore, the tip surfaces of the six projecting portions 42, 43, 44, 45, 46, 47 of the triaxial core 40 are finished to be flat surfaces, and the disk surfaces on both sides of the common gap body 60 are also finished to flat surfaces. .

  An example of the manufacturing procedure of the three-phase magnetically coupled reactor 10 having the above configuration will be described below. First, the electromagnetic steel plates punched and formed into a predetermined shape are laminated to produce the four-surface cylindrical core 22 and the two lid cores 26 and 28. The four-sided cylinder core 22 and the bottom-side lid core 28 are integrated by an appropriate coupling means. The coupling means may be mechanical coupling such as screwing or may use an adhesive. When an insulating material adhesive is used, the adhesive layer serves as a gap layer, and therefore an adhesive mixed with an appropriate magnetic powder may be used.

  Next, the triaxial core 40 is manufactured by a powder molding technique. Then, each phase coil 50 is wound around the triaxial core 40. Specifically, the U-phase coil 52 is wound around the protrusions 42 and 43, the V-phase coil 54 is wound around the protrusions 44 and 45, and the W-phase coil 56 is wound around the protrusions 46 and 47.

  A corresponding common gap body 62, 63, 64, 65, 66, 67 is attached to each tip surface of each of the six projecting portions 42, 43, 44, 45, 46, 47 of the triaxial core 40. Attach and fix with. As a suitable adhesive material, the same material as that used for coupling the four-surface cylindrical core 22 and the lid core 28 on the bottom surface side can be used.

  And each phase coil 50 was wound by the opening part of the four-surface cylinder part core 22 integrated with the cover part core 28 of the bottom face side, and the common gap body 60 was attached to the front end surface of each protrusion part, respectively. The triaxial core 40 is inserted and arranged. And the cover core 26 corresponding to the ceiling surface side is covered. At that time, each common gap body 60 is disposed so as to oppose each of the six inner wall surfaces of the storage space 24, and therefore, using a suitable adhesive, the front-side surface of each common gap body 60, Fix the space between the inner wall of the storage space. As a suitable adhesive material, the same material as that used for coupling the four-surface cylindrical core 22 and the lid core 28 on the bottom surface side can be used. In this way, the three-phase magnetically coupled reactor 10 can be assembled and manufactured.

  The operation of the above configuration will be described using FIG. 5 and FIG. 6 in comparison with the prior art. The three-phase magnetically coupled reactor 10 has a cubic outer shape having the same dimensional relation in three orthogonal axes, and has a cubic storage space having the same dimensional relation in the three orthogonal directions inside. In addition, a triaxial core having the same dimensional relation in the three axial directions orthogonal to each other is disposed. Therefore, if each phase coil having the same number of turns is wound around three orthogonal axes of the three-axis core, the magnetic coupling between the phases can be easily made the same.

  FIG. 5 is a diagram illustrating a state of magnetic coupling between the phases using a cross section passing through the center point of the three-phase magnetic coupling reactor 10. In a cross section parallel to the XY plane, magnetic couplings 72 and 73 are generated between the magnetic field of the U-phase coil 52 arranged parallel to the X-axis and the magnetic field of the V-phase coil 54 arranged parallel to the Y-axis. . A mutual inductance between the U phase and the V phase is formed by the magnetic couplings 72 and 74, so that a high inductance can be realized as a reactor as compared with a case where these magnetic couplings do not occur.

  Similarly, the cross section parallel to the XZ plane has a magnetic coupling between the magnetic field of the U-phase coil 52 arranged parallel to the X-axis and the magnetic field of the W-phase coil 56 arranged parallel to the Z-axis. 74,75 occur. Thereby, a mutual inductance between the U phase and the W phase is formed. Further, in the cross section parallel to the YZ plane, magnetic coupling 76, 77 between the magnetic field of the V-phase coil 54 arranged in parallel to the Y-axis and the magnetic field of the W-phase coil 56 arranged in parallel to the Z-axis. Occurs. Thereby, a mutual inductance between the U phase and the W phase is formed. As a result, a higher inductance can be realized as a reactor.

  By utilizing the mutual inductance formed in this way, a high inductance can be realized as a reactor, and thus the reactor can be further reduced in size. Moreover, from the above dimension setting relationship, these magnetic couplings 72, 73, 74, 75, 76, 77 have exactly the same action. That is, there is no difference in size, bias, distortion, non-uniformity, etc. between the magnetic couplings between the phases. Thus, the magnetic path length between the phases is the same, and the inductance between the phases is the same. As can be understood from FIG. 1, the three-phase reactor is properly stored in the volume of the cube, there is no useless space, and the space utilization efficiency is high. As described above, the three-phase magnetically coupled reactor 10 can further improve the space utilization efficiency as compared with the configuration of the prior art while maintaining the same magnetic path length.

  FIG. 6 shows an example of a conventional three-phase magnetically coupled reactor 80. Here, the iron cores for each phase are arranged in a straight line in a plane. Here, as the iron core, an upper iron core 82 having five legs and a lower iron core 83 are connected with a gap body 84 interposed therebetween to form four hand windows. And the U-phase coil 92, the V-phase coil 94, and the W-phase coil 96 are wound around every other leg for the five legs.

  In such a configuration, the magnetic coupling between the magnetic field 102 of the U-phase coil 92 and the magnetic field 104 of the V-phase coil 94 is such that the leg around which the U-phase coil 92 is wound and the leg around which the V-phase coil 94 is wound. It occurs at the intermediate leg 93 between the two parts. Similarly, the magnetic coupling between the magnetic field 106 of the V-phase coil 94 and the magnetic field 108 of the W-phase coil 96 is between the leg around which the V-phase coil 94 is wound and the leg around which the W-phase coil 96 is wound. In the middle leg 95 in between. As shown in FIG. 6, these magnetic couplings exhibit the same action as each other because the magnetic path lengths are interaction of the same magnetic field.

  However, the magnetic coupling between the U-phase coil 92 and the W-phase coil 96 is complicated. That is, the magnetic coupling between the magnetic field 102 of the U-phase coil 92 and the magnetic field 107 of the W-phase coil 96 occurs at the intermediate leg 93, and between the magnetic field 103 of the U-phase coil 92 and the magnetic field 108 of the W-phase coil 96. The magnetic coupling occurs at the intermediate leg 95. Thus, the magnetic coupling between the U-phase coil 92 and the W-phase coil 96 can occur at the two intermediate legs 93 and 95. As shown in FIG. 6, the magnetic field 102 and the magnetic field 107 have different magnetic path lengths, and the magnetic field 103 and the magnetic field 108 have different magnetic path lengths.

  Thus, in the configuration of the conventional three-phase magnetically coupled reactor 80, the magnetic path lengths between the phases are different, and the inductances between the phases are not the same. Then, a difference in size, bias, distortion, non-uniformity, and the like occur between the magnetic couplings between the phases.

  The three-phase magnetic coupling reactor according to the present invention can be used for a three-phase voltage converter, a three-phase transformer, and the like.

  10 three-phase magnetic coupling reactor, 20 hexahedron core, 22 4-sided cylinder core, 24 storage space, 26, 28 lid core, 30 main body, 32, 34, 36 reactor, 40 triaxial core, 42, 43, 44, 45, 46, 47 Protruding part, 50 Each phase coil, 52 U phase coil, 54 V phase coil, 56 W phase coil, 60, 62, 63, 64, 65, 66, 67 Common gap body, 72, 73 , 74, 75, 76, 77 Magnetic coupling, 80 (prior art) three-phase magnetic coupling reactor, 82 Upper iron core, 83 Lower iron core, 84 Gap body, 92 U phase coil, 93, 95 Intermediate leg, 94 V Phase coil, 96 W phase coil, 102, 103, 104, 106, 107, 108 magnetic field.

Claims (3)

A triaxial core having projecting portions projecting in six directions from the central portion along three axes orthogonal to each other;
Each of the three phase coils wound around each axis of the three-axis core;
A hexahedral core having a storage space capable of storing therein a triaxial core around which each phase coil is wound, and having six inner wall surfaces facing the six projecting portions of the triaxial core;
A three-phase magnetically coupled reactor comprising: The three-phase magnetically coupled reactor according to claim 1,
The hexahedral core is
A four-sided cylindrical core including a through-hole having openings at both ends;
Two lid cores that magnetically close the openings at both ends of the four-sided cylinder,
A three-phase magnetically coupled reactor. The three-phase magnetically coupled reactor according to claim 1,
A three-phase magnetically coupled reactor, comprising six common gap bodies arranged between each of six inner wall surfaces of a hexahedral core and each of tip surfaces of six projecting portions of the triaxial core.

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