JP6360086B2 - Three-phase reactor with iron core and coil - Google Patents

Description

  The present invention relates to a three-phase reactor including an iron core and a coil.

  Usually, a three-phase reactor has three iron cores and three coils wound around these iron cores. Patent Document 1 discloses a three-phase reactor including three coils arranged in parallel. Patent Document 2 discloses that the central axes of the plurality of coils are arranged around the central axis of the three-phase reactor. Further, Patent Document 3 discloses a three-phase reactor including a plurality of linear magnetic cores arranged in the radial direction, a connecting magnetic core that connects these linear magnetic cores, and a linear magnetic core and a coil wound around the connecting magnetic core. ing.

JP-A-2-203507 International Publication No. 2014/033830 JP 2008-177500 A

  Here, a three-phase alternating current flows through the coils of each phase of the three-phase reactor. In the three-phase reactor according to the prior art, the length of the magnetic path through which the magnetism generated when a current flows through an arbitrary two-phase coil may vary depending on the combination of phases. Therefore, even when a balanced three-phase AC current is passed through each phase of the three-phase reactor, there is a problem that the magnetic flux density flowing through the iron core of each phase is different and the inductance is also unbalanced.

In the three-phase reactor of the prior art, there may not be a phase of the iron core coil symmetrically arranged. For this reason, the magnetic flux generated from the iron core coil causes the inductance to become unbalanced. Thus, when the inductance is unbalanced in the three-phase reactor, even if there is an ideal input of three-phase alternating current, an ideal output of three-phase alternating current cannot be obtained.

  In the three-phase reactor of the prior art, the gap size (gap thickness) depends on the size of the gap material available on the market. For this reason, when determining the structure of a three-phase reactor, the number of turns of a coil and a cross-sectional area may be restricted by the dimension of a gap material. In addition, the accuracy of inductance in the three-phase reactor is determined according to the accuracy of the thickness of the gap material. Since the accuracy of the thickness of the gap material is generally about ± 10%, the accuracy of the inductance in the three-phase reactor is determined accordingly. Although it is possible to create a gap material having a desired size, the cost for the gap material increases.

  Further, when assembling the three-phase reactor, it is necessary to perform a step of assembling one core member of the three-phase reactor one by one and a step of connecting several core members to each other a plurality of times. For this reason, there exists a problem that the dimension management of a gap is difficult. Further, the manufacturing cost is further increased by improving the accuracy of the thickness of the gap material.

  Moreover, a core member is normally formed by laminating | stacking a some laminated steel plate. And a three-phase reactor requires the part which a core member and a core member contact mutually. And in order to raise the precision of the part which contacts, it may be necessary to mutually superimpose a laminated steel plate, and such an operation | work was very complicated.

  Moreover, in the three-phase reactor of the prior art, since the coil is exposed to the outside, there is a problem that the magnetic field leaks to the air portion around the coil of the three-phase reactor. The leaked magnetic field may affect the operation of the heart pacemaker or may heat the magnetic material around the three-phase reactor. Furthermore, in recent years, since there is a tendency to drive amplifiers, motors, etc. by higher frequency switching, the frequency of high frequency noise also tends to be higher, and the influence of the leaked magnetic field on the outside is expected to be greater. The

  Further, the problem that the inductance is unbalanced can be solved by expanding only the gap of the central phase. However, if the gap is enlarged, the magnetic field will leak further.

  The present invention has been made in view of such circumstances, and an object thereof is to provide a three-phase reactor in which inductance is not unbalanced and a magnetic field is not leaked to the outside.

In order to achieve the above-described object, according to the first invention, the central core, the outer peripheral core that surrounds the central core, and the central core and the outer core are magnetically coupled to each other. Comprising at least three connecting parts, wherein the connecting part is composed of one or more connecting iron cores, one or more coils wound around the connecting iron core, and one or more gaps. The connecting portion is in contact with only the central core, the connecting portion is integrated with only the central core, or the connecting portion is on both the central core and the outer core. Three-phase in which the connecting portion is integrated with both the central core and the outer peripheral core, or the connecting portion is separated from both the central core and the outer peripheral core. Reactor provided That.
According to a second aspect of the present invention, the apparatus includes a central core, an outer peripheral core that surrounds the central core, and at least three connecting portions that magnetically connect the central core and the outer core. The connecting portion includes one or a plurality of connecting iron cores, one or a plurality of coils wound around the connecting iron core, and one or a plurality of gaps. A three-phase reactor is provided that extends only in the radial direction.
According to a third aspect of the present invention, there is provided a central core, an outer peripheral core that surrounds the central core, and at least three connecting portions that magnetically connect the central core and the outer core. The connecting portion includes one or a plurality of connecting iron cores, one or a plurality of coils wound around the connecting iron core, and one or a plurality of gaps. The central core and the outer peripheral core are connected to the connection so that the magnetic flux generated by the plurality of coils becomes approximately zero in the central core through a magnetic path passing through each of the connection and the central core. A three-phase reactor is provided in which a part is arranged.
According to a fourth invention, in any one of the first to third inventions, the number of the connecting portions is a multiple of three.
According to a fifth invention, in any one of the second to fourth inventions, the connecting portion is separated from both the central core and the outer peripheral core.
According to a sixth invention, in any one of the second to fourth inventions, the connecting part is in contact with both the central core and the outer peripheral core, or the connecting part is the central part. It is united with both an iron core and the said outer peripheral part iron core.
According to a seventh invention, in any one of the second to fourth inventions, the connecting portion is in contact with only one of the central core and the outer peripheral core, or the connecting portion is the One of the central core and the outer peripheral core is integrated.
According to an eighth invention, in any one of the first to seventh inventions, the coil is concentrated winding.
According to a ninth invention, in any one of the first to seventh inventions, the coil is a distributed winding.
According to a tenth invention, in any one of the first to ninth inventions, a plurality of the coils are present and are connected by at least one of series and parallel.
According to the eleventh invention, in any one of the first to tenth inventions, an extension portion extending in the circumferential direction is provided at the tip of at least one of the connecting portions.
According to a twelfth invention, in any one of the first to eleventh inventions, the three-phase reactor includes a first group consisting of at least three coupling parts and a second group consisting of at least three other coupling parts. Contains. There may be two or more pairs.
According to the thirteenth invention, in any one of the first to twelfth inventions, the connection portion of the three-phase reactor is disposed rotationally symmetrically with respect to the central core.
According to a fourteenth aspect, in any one of the first to thirteenth aspects, the outer peripheral core is composed of a plurality of outer peripheral core portions.
According to a fifteenth aspect, in the fourteenth aspect, an outer peripheral gap is formed between adjacent outer peripheral core portions of the plurality of outer peripheral core portions.

In the first to fourth inventions, since the connecting portions are arranged around the central core, the magnetic flux of the coil is concentrated from each connecting portion toward the central core, and becomes almost zero in the central core. High frequency noise can be greatly reduced. In addition, the difference in magnetic path length between the phases is smaller than that in the conventional structure, and the inductance imbalance caused by the difference in magnetic path length can be reduced. Furthermore, since the connecting portion is disposed around the central core, the magnetic flux generated from the connecting portion coil is less balanced than the conventional structure, and the inductance unbalance caused by the magnetic flux unbalance can be reduced. . Furthermore, since the central core is surrounded by the outer peripheral core, the magnetic field does not leak to the outside of the outer peripheral core.
In the fifth aspect, a cylindrical central core and an outer peripheral core that can be easily created can be employed.
In 6th invention, a structural member can be reduced by integrating a part of connection part with a center part iron core or an outer peripheral part iron core.
In the seventh aspect of the invention, since either or both of the central core and the outer peripheral core that are not integrated with the connecting portion can be formed into a cylindrical shape, a simple configuration can be achieved.
In the eighth or ninth invention, a three-phase reactor can be created with a simple configuration.
In the tenth aspect, the inductance value of the three-phase reactor can be adjusted by combining series and / or parallel.
In the eleventh aspect , the gap area can be easily increased.
In the twelfth aspect , by configuring a plurality of reactors in one reactor in a structure of one reactor, it becomes possible to arrange the reactors in a narrower installation space, or to connect the plurality of reactors in series. Alternatively, the inductance value can be adjusted by connecting them in parallel.
In the thirteenth invention, by arranging the coupling portion rotationally symmetrically with respect to the center core, the effect of reducing the inductance imbalance due to the length of the magnetic path length in the first invention, and the coil The effect of reducing the inductance imbalance caused by the arrangement is maximized.
In the fourteenth invention, the manufacturability and assemblability are improved by dividing the outer peripheral iron core into a plurality of outer peripheral iron core portions.
In the fifteenth invention, adjustment of the inductance is facilitated by providing the outer peripheral gap.

  These and other objects, features and advantages of the present invention will become more apparent from the detailed description of exemplary embodiments of the present invention illustrated in the accompanying drawings.

It is sectional drawing of the three-phase reactor based on 1st embodiment of this invention. It is the perspective view which removed the coil from the three-phase reactor shown by FIG. 1A. It is sectional drawing of the three-phase reactor based on 2nd embodiment of this invention. It is sectional drawing of the other three-phase reactor based on 2nd embodiment of this invention. It is sectional drawing of the three-phase reactor based on 3rd embodiment of this invention. It is sectional drawing of the other three-phase reactor based on 3rd embodiment of this invention. It is sectional drawing of the three-phase reactor based on 4th embodiment of this invention. It is a 1st sectional view of a three phase reactor based on a 5th embodiment of the present invention. It is a 2nd sectional view of the three phase reactor based on a 5th embodiment of the present invention. It is a 3rd sectional view of the three phase reactor based on a 5th embodiment of the present invention. It is sectional drawing of the three-phase reactor based on 6th embodiment of this invention. It is other sectional drawing of the three-phase reactor based on 6th embodiment of this invention. It is a circuit diagram of the three-phase reactor based on 6th embodiment of this invention. It is another circuit diagram of the three-phase reactor based on the 6th embodiment of this invention. It is sectional drawing of the three-phase reactor based on 7th embodiment of this invention. It is sectional drawing of the three-phase reactor based on 8th embodiment of this invention. It is sectional drawing of the three-phase reactor based on 9th embodiment of this invention. It is a figure which shows the magnetic field of the three-phase reactor shown by FIG. 3B. It is a figure which shows the magnetic field of the three-phase reactor in a prior art. It is a 1st figure which shows the direction of the magnetic flux in a three-phase reactor. It is a 2nd figure which shows the direction of the magnetic flux in a three-phase reactor. It is sectional drawing of the three-phase reactor based on 10th Embodiment of this invention. It is sectional drawing of the three-phase reactor based on 11th embodiment of this invention.

Embodiments of the present invention will be described below with reference to the accompanying drawings. In the following drawings, the same members are denoted by the same reference numerals. In order to facilitate understanding, the scales of these drawings are appropriately changed.
FIG. 1A is a cross-sectional view of a three-phase reactor according to a first embodiment of the present invention. 1B is a perspective view of the three-phase reactor shown in FIG. 1A. As shown in FIGS. 1A and 1B, the three-phase reactor 5 includes a central core 10, an outer peripheral core 20 that surrounds the central core 10, and the central core 10 and the outer peripheral core 20 that are magnetically coupled to each other. It includes at least three connecting portions 31 to 33 to be connected. In FIG. 1A, the central core 10 is arranged at the center of the annular outer peripheral core 20. Thus, in the present invention, the central core 10 and the outer peripheral core 20 are significantly different in shape.

  In addition, the center part iron core 10, the outer peripheral part iron core 20, and the connection parts 31-33 laminate | stack a some iron plate, a carbon steel plate, an electromagnetic steel plate, or are produced from magnetic materials, such as a ferrite or a dust core. Moreover, the outer peripheral part iron core 20 may be integral and the outer peripheral part iron core 20 may be divided | segmented into a some small part. Further, the number of the connecting portions 31 to 33 may be a multiple of three. For example, as described later, the number of connecting portions may be six.

  As shown in FIG. 1, each of the connecting portions 31 to 33 includes connecting iron cores 11 to 13 that are in contact with the central core 10. These connecting cores 11 to 13 are arranged at equal intervals in the circumferential direction. Further, each of the connecting portions 31 to 33 has connecting iron cores 21 to 23 that are in contact with the inner peripheral surface of the outer peripheral portion iron core 20. These connecting iron cores 21 to 23 are also arranged at equal intervals in the circumferential direction. Therefore, the connection parts 31-33 are arrange | positioned at equal intervals mutually in the circumferential direction. In addition, each of the connecting iron cores 21 to 23 faces each other of each of the connecting iron cores 11 to 13. The connecting iron cores 11 to 13 may be separate members from the central core 10 or may be integrated members. Similarly, the connecting iron cores 21 to 23 may be separate members from the outer peripheral core 20 or may be integrated members. The same applies to other embodiments described later.

  The connecting portion 31 described above can be magnetically connected between the connecting core 11 in contact with the central core 10, the connecting core 21 in contact with the outer peripheral core 20, and the connecting core 11 and the connecting core 21. The gap 101 is formed.

  Similarly, the connecting portion 32 can be magnetically connected between the connecting core 12 that contacts the central core 10, the connecting core 22 that contacts the outer peripheral core 20, and the connecting core 12 and the connecting core 22. And the gap 102 formed in the above. Further, the connecting portion 33 can be magnetically connected between the connecting core 13 in contact with the central core 10, the connecting core 23 in contact with the outer peripheral core 20, and the connecting core 13 and the connecting core 23. The gap 103 formed is included as well. As shown in FIG. 1A, in the first embodiment, the front end surface of the connecting iron core 11 and the front end surface of the connecting iron core 21 are both flat. As a result, the gap 101 is linear or rectangular. The other gaps 102 and 103 have the same configuration. In addition, the gap material which consists of an insulator may be inserted in the gaps 101-103 of the three-phase reactor 5 in this invention.

  Further, as shown in FIG. 1A, coils 51 and 41 are wound around the connecting cores 11 and 21 of the connecting portion 31, respectively. Similarly, coils 52 and 42 are wound around the connecting cores 12 and 22 of the connecting portion 32, respectively. Similarly, coils 53 and 43 are wound around the connecting iron cores 13 and 23 of the connecting portion 33, respectively. In FIG. 1B, these coils are not shown for the sake of brevity.

  In addition, in the both end surfaces of the three-phase reactor 5, the center part iron core 10 and the outer peripheral part iron core 20 are mutually fastened. In this case, both end surfaces of the three-phase reactor 5 are magnetically shielded depending on the purpose. When magnetically shielded, the coil cannot be visually recognized from both end faces of the three-phase reactor 5. On the other hand, when it is not magnetically shielded, the coil can be visually recognized from both end faces of the three-phase reactor 5.

  In this invention, while arrange | positioning the center part core 10 in the center of the outer peripheral part core 20, the connection parts 31-33 are arrange | positioned at equal intervals mutually in the circumferential direction. Therefore, in the present invention, the coils 41 to 53 and the gaps 101 to 103 in the connecting portions 31 to 33 are also equally spaced in the circumferential direction, and the three-phase reactor 5 itself has a rotationally symmetric structure.

  For this reason, the magnetic flux is typically concentrated in the center of the three-phase reactor 5, and in the three-phase AC, the total magnetic flux in the center of the three-phase reactor 5 becomes zero. Therefore, in the present invention, there is no difference in magnetic path length between phases, and inductance imbalance due to the difference in magnetic path length can be eliminated. Furthermore, since the magnetic flux unbalance generated from the coil can be eliminated, the inductance imbalance caused by the magnetic flux unbalance can be eliminated.

  Furthermore, in the present invention, the steel sheet is punched with high precision using a mold and is laminated with high precision by caulking or the like, whereby the central core 10, the outer peripheral core 20, and the connecting parts 31 to 33 are highly accurately formed. Can be created. As a result, the central iron core 10, the outer peripheral iron core 20, and the connecting portions 31 to 33 can be assembled to each other with high accuracy, and the gap dimension can be managed with high accuracy.

  In other words, in the present invention, gaps of arbitrary dimensions can be formed with high accuracy at low cost in the connecting portions 31 to 33 between the central core 10 and the outer peripheral core 20. Therefore, in this invention, the freedom degree of design of the three-phase reactor 5 improves, As a result, the precision of an inductance also improves.

  Furthermore, in this invention, the connection parts 31-33 containing the coils 41-53 and the gaps 101-103 are enclosed by the outer peripheral part core 20. As shown in FIG. For this reason, in this invention, a magnetic field and magnetic flux do not leak to the exterior of the outer peripheral part core 20, but can reduce a high frequency noise significantly.

  FIG. 2A is a cross-sectional view of a three-phase reactor according to the second embodiment of the present invention. In FIG. 2A, the connecting iron cores 11 to 13 included in the connecting portions 31 to 33 are longer than the connecting iron cores 11 to 13 included in the connecting portions 31 to 33 shown in FIG. And the connecting iron cores 21-23 contained in the connection parts 31-33 are shorter than the connecting iron cores 21-23 contained in the connection parts 31-33 shown by FIG. Furthermore, although the coils 51-53 are wound around the connecting iron cores 11-13, no coil is wound around the connecting iron cores 21-23.

  FIG. 2B is a cross-sectional view of another three-phase reactor according to the second embodiment of the present invention. 2B, the connecting iron cores 11 to 13 of the connecting portions 31 to 33 are shorter than the connecting iron cores 11 to 13 of the connecting portions 31 to 33 shown in FIG. And the connection iron cores 21-23 of the connection parts 31-33 are longer than the connection iron cores 21-23 of the connection parts 31-33 shown by FIG. Further, in FIG. 2B, no coils are wound around the connecting iron cores 11 to 13, and coils 41 to 43 are wound around the connecting iron cores 21 to 23.

  In the configuration shown in FIGS. 2A and 2B, since the number of coils is small, the structure of the three-phase reactor 5 becomes simple and the manufacture becomes easy. It will be clear that the same effect as described above can be obtained.

  FIG. 3A is a cross-sectional view of a three-phase reactor according to a third embodiment of the present invention. 3A includes only connecting iron cores 11 to 13 and does not include connecting iron cores 21 to 23. The connecting iron cores 11 to 13 are in contact with the central core 10 and extend to the vicinity of the inner peripheral surface of the outer peripheral core 20. The connecting iron cores 11 to 13 are not in contact with the outer peripheral iron core 20. Therefore, the outer peripheral core 20 in FIG. 3A is cylindrical. Furthermore, the front end surfaces of the connecting cores 11 to 13 in FIG. 3A are curved in a convex shape along the inner peripheral surface of the outer peripheral core 20. Furthermore, coils 51 to 53 are wound around the connecting cores 11 to 13 included in the connecting portions 31 to 33.

  FIG. 3B is a cross-sectional view of another three-phase reactor according to the third embodiment of the present invention. 3B includes only the connecting iron cores 21 to 23 and does not include the connecting iron cores 11 to 13. The connecting iron cores 21 to 23 are in contact with the outer peripheral iron core 20 and extend to the vicinity of the outer peripheral surface of the central iron core 10. The connecting iron cores 21 to 23 are not in contact with the central core 10. Accordingly, the central core 10 in FIG. 3B is cylindrical. Further, the front end surfaces of the connecting cores 21 to 23 in FIG. 3B are curved in a concave shape along the outer peripheral surface of the central core 10. Further, coils 41 to 43 are wound around the connecting cores 21 to 23 that are in contact with the outer peripheral core 20.

  As shown in FIG. 3A and FIG. 3B, the connecting portion 31 may include any one of the connecting core 11 in contact with the central core 10 and the connecting core 21 in contact with the outer peripheral core 20. The same applies to the other connecting portions 32 and 33. However, even in such a case, the dimensions of the gaps 101 to 103 do not change.

  In FIG. 3A, a cylindrical outer peripheral core 20 can be adopted, and in FIG. 3B, a cylindrical central core 10 can be adopted. In other words, in the third embodiment, the central core 10 or the outer peripheral core 20 can be cylindrical. Therefore, the three-phase reactor 5 can be simplified and the manufacturing cost can be reduced. It will be clear that the same effect as described above can be obtained.

  FIG. 4 is a sectional view of a three-phase reactor based on the fourth embodiment of the present invention. The three-phase reactor 5 shown in FIG. 4 includes six connecting portions 31 to 36. These connecting portions 31 to 36 include six connecting iron cores 11 to 16 in contact with the central iron core 10 and six connecting iron cores 21 to 26 in contact with the outer peripheral iron core 20 surrounding the central iron core 10. Therefore, as described above, the connecting iron cores 11 to 16 and the connecting iron cores 21 to 26 are arranged at equal intervals in the circumferential direction. Further, gaps 101 to 106 that can be magnetically connected are formed between the connecting iron cores 11 to 16 and the connecting iron cores 21 to 26.

  As shown in FIG. 4, a three-phase reactor can be formed by appropriately connecting the coils as will be described later. Moreover, the front end surface of the connecting core 11 included in the connecting portion 31 shown in FIG. 4 is curved in a convex shape along the circumferential direction, and the front end surface of the connecting core 21 is curved in a concave shape along the circumferential direction. doing. The same applies to the other connecting portions 32 to 36. In this case, it is obvious that the same effect as described above can be obtained.

  FIG. 5A is a first cross-sectional view of a three-phase reactor according to a fifth embodiment of the present invention. The three-phase reactor 5 shown in FIG. 5A includes three connecting portions 31 to 33. In FIG. 5A, the connecting portions 31 to 33 include connecting iron cores 11 to 13 that are in contact with the central core 10, connecting iron cores 21 to 23 that are in contact with the outer peripheral iron core 20, connecting iron cores 11 to 13, and connecting iron cores. And connecting iron cores 61 to 63 arranged between 21 to 23. As illustrated, the connecting iron cores 61 to 63 are separated from both the connecting iron cores 11 to 13 and the connecting iron cores 21 to 23. A magnetically connectable gap is formed between the connecting iron cores 11 to 13 and the connecting iron cores 61 to 63 and between the connecting iron cores 61 to 63 and the connecting iron cores 21 to 23. Yes.

  Further, the coils 51 to 53 are wound around the connecting cores 11 to 13 that are in contact with the central core 10, but the coils are not wound around the connecting cores 21 to 23 that are in contact with the outer peripheral core 20. Instead, the coils 71 to 73 are wound around the connecting iron cores 61 to 63. In such a configuration, the inductance of the reactor 5 can be easily changed by replacing the connecting iron cores 61 to 63 provided with the coils 71 to 73 having different winding numbers and cross-sectional areas with the existing connecting iron cores 61 to 63. You will understand. It will be clear that the same effect as described above can be obtained.

  FIG. 5B is a second cross-sectional view of the three-phase reactor according to the fifth embodiment of the present invention. The reactor 5 shown by FIG. 5B contains the six connection parts 31-36. As can be seen from FIG. 5B, the connecting portions 31 to 36 include connecting iron cores 61 to 66 located in the vicinity of the central core 10 and connecting iron cores 81 to 86 located in the vicinity of the outer peripheral iron core 20. Furthermore, the coils 71-76 are wound around the connecting iron cores 61-66, and the coils 91-96 are wound around the connecting iron cores 81-86.

  Both of the connecting iron cores 61 to 66 and the connecting iron cores 81 to 86 are disposed between the central core 10 and the outer peripheral core 20. The connecting cores 61 to 66 and the connecting cores 81 to 86 are not in contact with both the central core 10 and the outer peripheral core 20. And between the core iron core 10 and the connecting iron cores 61-66, between the connecting iron cores 61-66 and the connecting iron cores 81-86, and between the connecting iron cores 81-86 and the outer peripheral iron core 20. Is formed with a magnetically connectable gap. Therefore, both the central core 10 and the outer peripheral core 20 shown in FIG. 5B are cylindrical. As can be seen from FIG. 5B, the connecting iron cores 61 to 66 and the connecting iron cores 81 to 86 are arranged at equal intervals in the circumferential direction. A larger number of connecting iron cores may be included.

  FIG. 5C is a third cross-sectional view of the three-phase reactor according to the fifth embodiment of the present invention. 5C is different from FIG. 5B in that common coils 71 to 76 are wound around the connecting iron cores 61 to 66 and the connecting iron cores 81 to 86. In other points, FIG. 5C is the same as FIG. 5B. It is.

  In the embodiment shown in FIG. 5B and FIG. 5C, the central core 10 and the outer peripheral core 20 may be cylindrical, and the configuration of the central core 10 and the outer peripheral core 20 can be simplified. Moreover, the inductance of the reactor 5 can be easily changed by replacing | exchanging the connection iron cores 61-66 and the connection iron cores 81-86 provided with the coil from which a winding number or a cross-sectional area differs with the existing connection iron core. It will be clear that the same effect as described above can be obtained.

  FIG. 6A is a cross-sectional view of a three-phase reactor based on the sixth embodiment of the present invention, and FIG. 6B is another cross-sectional view of the three-phase reactor based on the sixth embodiment of the present invention. In these drawings, the three-phase reactor 5 has six connecting portions. These connecting portions include six connecting iron cores 21 to 26 in contact with the outer peripheral iron core 20. Coils 41 to 46 are wound around the connecting iron cores 21 to 26, respectively. Moreover, the front end surfaces of the connecting iron cores 21 to 26 are concavely curved.

  In FIG. 6A, each coil is concentrated winding. Therefore, the coils 41 and 44 shown in FIG. 6A are the R-phase coils R1 and R2, the coils 42 and 45 are the T-phase coils T1 and T2, and the coils 43 and 46 are the S-phase coils S1 and S2.

  In contrast, in FIG. 6B, each coil is distributed winding. Therefore, as shown in FIG. 6B, the first R-phase coil is wound between the connecting iron cores 21 and 26, and the second R-phase coil is wound between the connecting iron cores 23 and 24. Yes. Similarly, the first T-phase coil is wound between the connecting iron cores 24 and 25, and the second T-phase coil is wound between the connecting iron cores 21 and 22. Similarly, the first S-phase coil is wound between the connecting iron cores 25 and 26, and the second S-phase coil is wound between the connecting iron cores 22 and 23.

  7A and 7B are circuit diagrams of a three-phase reactor according to the sixth embodiment of the present invention. In FIG. 7A, the aforementioned R-phase coil R1 and R-phase coil R2 are connected in series. Two T-phase coils T1, T2 and two S-phase coils S1, S2 are similarly connected in series. In FIG. 7B, the aforementioned R-phase coil R1 and R-phase coil R2 are connected in parallel. Two T-phase coils T1, T2 and two S-phase coils S1, S2 are similarly connected in parallel.

  In this way, the inductance value of the three-phase reactor 5 can be adjusted by changing the coil connection method in series or in parallel. Further, for example, when the three-phase reactor 5 has six connecting portions 31 to 36, the coils in the connecting portions 31, 33, and 35 are connected in series, and the coils in the connecting portions 32, 34, and 36 are connected in parallel. It may be. It will be understood that the inductance value can be adjusted in this case as well.

  FIG. 8 is a cross-sectional view of a three-phase reactor based on the seventh embodiment of the present invention, and is substantially the same as FIG. 3B. In FIG. 8, extending portions 21 a to 23 a extending in the circumferential direction are formed at the distal ends of the connecting cores 21 to 23 that are in contact with the outer peripheral core 20. The dimension of the gap between these extension parts 21a-23a and the center part iron core 10 is mutually equal. As shown in the figure, in the eighth embodiment, the gaps 101 to 103 are curved in the circumferential direction.

When such extending portions 21a to 23a are provided, the areas of the gaps 101 to 103 in the connecting iron cores 21 to 23 can be easily increased. In addition, the structure which equips the front-end | tip of the connection cores 11-13 which contact | connect the center part iron core 10 with the extension part similar to what was mentioned above may be sufficient, and the extension core 11 which connects the center part core core 10 may be sufficient as it. ˜13 and the connecting cores 21 to 23 in contact with the outer peripheral core 20 may be provided. It will be clear that the same effect as described above can be obtained.

  FIG. 9 is a sectional view of a three-phase reactor based on the eighth embodiment of the present invention. The three-phase reactor 5 shown in FIG. 9 includes six connecting portions 31 to 36. These connecting portions 31 to 36 include three connecting iron cores 11, 13, and 15 that are in contact with the central core 10 and six connecting iron cores 21 to 26 that are in contact with the outer peripheral iron core 20. The three connecting iron cores 11, 13, 15 and the six connecting iron cores 21 to 26 are arranged at equal intervals in the circumferential direction. Further, as can be seen from FIG. 9, the three connecting cores 21, 23, and 25 that contact the outer peripheral core 20 face the three connecting cores 11, 13, and 15 that contact the central core 10, respectively.

  In the embodiment shown in FIG. 9, the connecting portions 31, 33, 35 and the connecting portions 32, 34, 36 are alternately arranged. The connecting portions 31, 33, and 35 include connecting cores 11, 13, and 15 that are in contact with the central core 10 and connecting iron cores 21, 23, and 25 that are in contact with the outer peripheral core 20. On the other hand, the connecting portions 32, 34, and 36 include only connecting cores 22, 24, and 26 that are in contact with the outer peripheral core 20.

  Since only the connecting cores 11, 13, 15 are in contact with the central core 10, the dimensions of the gaps 101, 103, 105 of the connecting portions 31, 33, 35 are the gaps 102, 104, of the connecting portions 32, 34, 36, It is smaller than the dimension of 106. Furthermore, as can be seen from FIG. 9, the cross-sectional areas of the coils 41, 43, 45 wound around the connecting iron cores 21, 23, 25 are equal to the coils 42, 44 wound around the connecting iron cores 22, 24, 26. , 46 is smaller than the cross-sectional area. Further, the number of turns of the coils 41, 43, 45 is different from the number of turns of the coils 42, 44, 46.

  Further, as can be seen from FIG. 9, the dimensions of the gaps 101, 103, and 105 of the connecting portions 31, 33, and 35 are equal to each other, and the dimensions of the gaps 102, 104, and 106 of the connecting portions 32, 34, and 36 are Equal to each other. Similarly, the number of turns and the cross-sectional area of the coils 41, 43, and 45 of the connecting portions 31, 33, and 35 are equal to each other, and the number of turns and the cross-sectional area of the coils 42, 44, and 46 of the connecting portions 32, 34, and 36 are equal to each other.

  In such a case, for example, the connecting portions 31, 33, and 35 indicated by broken lines are set as the first set, and the connecting portions 32, 34, and 36 indicated by alternate long and short dash lines are set as the second set. That is, the three-phase reactor 5 shown in FIG. 9 has two sets of connecting portions. In each of the first set and the second set, R-phase, T-phase, and S-phase coils may be determined.

  FIG. 10 is a cross-sectional view of another three-phase reactor based on the ninth embodiment of the present invention. The three-phase reactor 5 shown in FIG. 10 includes six connecting portions 31 to 36. These connecting portions 31 to 36 include only six connecting cores 11 to 16 that are arranged at equal intervals in the circumferential direction and are in contact with the central core 10.

  In the embodiment shown in FIG. 10, the connecting portions 31, 33, and 35 and the connecting portions 32, 34, and 36 are alternately arranged. And the connecting iron cores 11, 13, 15 in the connecting parts 31, 33, 35 are longer than the connecting iron cores 12, 14, 16 in the connecting parts 32, 34, 36.

  Accordingly, the dimensions of the gaps 101, 103, 105 of the connecting portions 31, 33, 35 are smaller than the dimensions of the gaps 102, 104, 106 of the connecting portions 32, 34, 36. Further, as can be seen from FIG. 10, the cross-sectional areas of the coils 51, 53, 55 wound around the connecting iron cores 11, 13, 15 are equal to the coils 52, 54 wound around the connecting iron cores 12, 14, 16. , 56 is smaller than the cross-sectional area. Furthermore, the number of turns of the coils 51, 53, and 55 is different from the number of turns of the coils 52, 54, and 56.

  Even in such a case, for example, the connecting portions 31, 33, and 35 indicated by broken lines are set as the first set, and the connecting portions 32, 34, and 36 indicated by alternate long and short dash lines are set as the second set. As described above, the R-phase, T-phase, and S-phase coils may be determined in each of the first group and the second group. Also, it will be apparent that the same effects as described above can be obtained in the configurations shown in FIGS.

  FIG. 13 is a cross-sectional view of another three-phase reactor based on the tenth embodiment of the present invention. The three-phase reactor 5 shown in FIG. 13 has substantially the same configuration as that shown in FIG. 3B. However, the outer peripheral core 20 is divided into a plurality of outer peripheral cores 20a, 20b, 20c, 20d, 20e, 20f, 20g, 20h, and 20i connected to each other. By dividing the outer peripheral iron core into a plurality of parts at an arbitrary location, there is an effect of reducing the material cost and reducing the material cost during manufacturing. Moreover, since the some outer peripheral part core parts 20a-20i are used, even if it is a case where the large-sized outer peripheral part core 20 is created, there exists an effect which becomes easy to assemble.

  FIG. 14 is a cross-sectional view of another three-phase reactor based on the eleventh embodiment of the present invention, and is the same view as FIG. In FIG. 14, the outer peripheral iron core 20 is divided into a plurality of outer peripheral iron core portions 20a, 20b, 20c, 20d, 20e, 20f, 20g, 20h, and 20i. Between the outer peripheral core portions 20b and 20c, between the outer peripheral core portions 20e and 20f, and between the outer peripheral core portions 20h and 20i, outer peripheral gaps 111, 112, and 113 that can be magnetically coupled are provided. Each is formed. Providing the outer peripheral gaps 111, 112, and 113 in the outer peripheral core 20 has an effect of facilitating adjustment of inductance imbalance.

  Here, FIG. 11A is a diagram showing the magnetic field of the three-phase reactor shown in FIG. 3B, and FIG. 11B is a diagram showing the magnetic field of the three-phase reactor in the prior art. In FIG. 11A, the magnetic field leaks in the vicinity of the respective base ends of the connecting cores 21 to 23 and between the central core 10 and the tip of the connecting core 23. However, any leakage of such a magnetic field is inside the outer peripheral core 20, and no magnetic field leaks outside the outer peripheral core 20.

  A three-phase reactor 90 shown in FIG. 11B has two iron core portions 98 and 99 each having a recess. As shown in FIG. 11B, the magnetic field leaks not only inside the concave portions of the iron core portions 98 and 99 but also outside the iron core portions 98 and 99. In other words, in the prior art, a magnetic field leaks outside the three-phase reactor 90. Therefore, it will be understood that the three-phase reactor 5 in the present invention has a remarkable effect of preventing leakage of the magnetic field.

  12A and 12B are diagrams showing the direction of magnetic flux in still another three-phase reactor. The three-phase reactor 5 shown in these drawings has a substantially cylindrical central core 10 and an outer peripheral core 20 in contact with six connecting cores arranged at equal intervals in the circumferential direction. In addition, coils 41 to 46 are wound around six connecting iron cores.

  In FIG. 12A, coils 41 and 44 are T-phase coils, coils 42 and 45 are R-phase coils, and coils 43 and 46 are S-phase coils. In the three-phase alternating current, the maximum current flows through the S-phase coils 43 and 46, and (−½) times the maximum current flows through the T-phase coils 41 and 44 and the R-phase coils 42 and 45. In FIG. 12A, the magnetic fluxes of the two S-phase coils 43 and 46 are directed toward the center of the three-phase reactor 5. In other words, the three-phase reactor 5 of the present invention typically has a magnetic flux concentrated at its center. And in three-phase alternating current, if the magnetic flux of the center part of the three-phase reactor 5 is totaled, it will become zero.

  In FIG. 12B, the coil 41 is a T-phase coil, the coil 42 is an -R phase coil, the coil 43 is an -S phase coil, the coil 44 is a -T phase coil, and the coil 45 is an R phase coil. And the coil 46 is an S-phase coil. In the three-phase alternating current, the maximum current flows through the S-phase coil 46, and (−½) times the maximum current flows through the T-phase coil 41 and the R-phase coil 45. In addition, it is assumed that the same current flows in the reverse direction in the coils with the sign “−”. As shown in FIG. 12B, the magnetic flux of the coil 43 that is the “−S phase coil” faces the center of the three-phase reactor 5. The magnetic flux of the coil 46, which is the “S phase coil”, is directed outward in the radial direction of the three-phase reactor 5.

  Since the three-phase reactor 5 is a stationary unit, the order of the coils may be changed as shown in FIGS. 12A and 12B. That is, the order of the coils can be appropriately selected according to the characteristics required for the three-phase reactor 5.

  Although the present invention has been described using exemplary embodiments, those skilled in the art can make the above-described changes and various other changes, omissions, and additions without departing from the scope of the invention. You will understand. The rotational symmetry described here refers to a symmetrical shape or arrangement that can solve the problem.

DESCRIPTION OF SYMBOLS 5 Three-phase reactor 10 Center part core 11-16 Connection core 20 Outer part core 20a-20i Outer part core part 21-26 Connection core 21a-23a Extension part 31-36 Connection part 41-46 Coil 51-56 Coil 61-66 Connecting iron core 71-76 Coil 81-86 Connecting iron core 91-96 Coil 101-106 Gap 111-113 Outer peripheral gap

Claims (15)

A central core (10);
An outer peripheral core (20) surrounding the central core;
Comprising at least three connecting portions (31 to 33) for magnetically connecting the central core and the outer peripheral core to each other;
The connecting portions (31-33) include one or more connecting iron cores (11-13, 21-23) and one or more coils (41-43, 51) wound around the connecting iron core. -53) and one or a plurality of gaps (101-103),
Whether the connecting portion is in contact with only the central core, the connecting portion is integral with only the central core, or the connecting portion is in contact with both the central core and the outer peripheral core, The connection part is a three-phase reactor in which the connection part is integrated with both the center part core and the outer periphery part core, or the connection part is separated from both the center part core and the outer periphery part core. A central core (10);
An outer peripheral core (20) surrounding the central core;
Comprising at least three connecting portions (31 to 33) for magnetically connecting the central core and the outer peripheral core to each other;
The connecting portions (31-33) include one or more connecting iron cores (11-13, 21-23) and one or more coils (41-43, 51) wound around the connecting iron core. -53) and one or a plurality of gaps (101-103),
The connecting portion is a three-phase reactor that extends only in a radial direction. A central core (10);
An outer peripheral core (20) surrounding the central core;
Comprising at least three connecting portions (31 to 33) for magnetically connecting the central core and the outer peripheral core to each other;
The connecting portions (31-33) include one or more connecting iron cores (11-13, 21-23) and one or more coils (41-43, 51) wound around the connecting iron core. -53) and one or a plurality of gaps (101-103),
The central core and the outer peripheral portion are configured such that the magnetic flux generated by the one or more coils becomes approximately zero in the central core through a magnetic path passing through each of the coupling portions and the central core. A three-phase reactor in which an iron core and the connecting portion are arranged.   The number of the said connection parts is a multiple of 3, The three-phase reactor as described in any one of Claim 1 to 3.   The said connection part is a three-phase reactor as described in any one of Claim 2 to 4 spaced apart from both the said center part iron core and the said outer peripheral part iron core.   The connecting portion is in contact with both the central core and the outer peripheral core, or the connecting portion is integrated with both the central core and the outer peripheral core. The three-phase reactor according to any one of 4.   The connecting portion is in contact with only one of the central core and the outer peripheral core, or the connecting portion is integrated with one of the central core and the outer peripheral core. Item 5. The three-phase reactor according to any one of Items 2 to 4.   The three-phase reactor according to any one of claims 1 to 7, wherein the coil is concentrated winding.   The three-phase reactor according to any one of claims 1 to 7, wherein the coil is a distributed winding. The three-phase reactor according to any one of claims 1 to 9 , wherein a plurality of the coils exist and are connected by at least one of series and parallel.   The three-phase reactor as described in any one of Claims 1 thru | or 10 with which the extension part (21a-23a) extended in the circumferential direction is provided in the front-end | tip of at least one of the said connection parts. The three-phase reactor includes a first set (31, 33, 35) composed of at least three connecting portions and a second set (32, 34, 36) composed of at least three other connecting portions,
The three-phase reactor according to any one of claims 1 to 11.   The connection part of the said three-phase reactor is a three-phase reactor as described in any one of Claims 1 thru | or 12 arrange | positioned rotationally symmetrically with respect to center part iron core.   The three-phase reactor according to any one of claims 1 to 13, wherein the outer peripheral core is composed of a plurality of outer peripheral core portions.   The three-phase reactor according to claim 14, wherein an outer peripheral gap is formed between adjacent outer peripheral core portions of the plurality of outer peripheral core portions.