CN206421899U - Multiphase reactor - Google Patents

Abstract

A polyphase reactor is provided. The multi-phase reactor is configured to include a first core (4) arranged at the center, and to be arranged outside the first core (4) in a ring shape with respect to a magnetic circuit of the first core (4). A plurality of second cores (1, 2, 3) and one or more winding wires (10, 20, 30) wound on the second cores (1, 2, 3). Thereby, a multi-phase reactor capable of unifying the inductance of each phase to a constant value is provided.

Description

Multi-phase reactor

technical field

The utility model relates to a multi-phase reactor capable of obtaining fixed inductance in each phase.

Background technique

Conventionally, for example, three-phase reactors are used in equipment such as industrial robots and machine tools, and are installed between the power supply side (primary side) and the inverter, or between the load side (secondary side) of a motor and the like and the inverter. between, used to reduce inverter faults and improve power factor.

Specifically, the three-phase reactor is installed on the primary side of the inverter to improve the power factor (to deal with harmonics), reduce the inrush current from the power supply, or install the three-phase reactor on the secondary side of the inverter, To reduce the motor noise when the inverter is running and deal with the inrush current. In addition, in this specification, three-phase reactors are mainly used as an example for description, but the application of the present invention is not limited to three-phase reactors, and multi-phase reactors other than three-phases may also be used.

In addition, conventionally, various proposals have been made as multi-phase reactors. For example, generally, a three-phase reactor has three cores (iron cores) and three winding wires (coils) wound around these cores. For example, Japanese Patent Application Laid-Open No. 2-203507 (Patent Document 1) discloses a three-phase reactor including three windings arranged in parallel.

In addition, International Publication No. 2014/033830 (Patent Document 2) discloses that the respective central axes of the plurality of windings are arranged around the central axis of the three-phase reactor. This can be considered as arranging the three winding parts of Patent Document 1 at the vertices of the equilateral triangle instead of being arranged side by side.

In addition, Japanese Patent Application Laid-Open No. 2008-177500 (Patent Document 3) discloses a varactor for variable reactance. The reactor includes six linear magnetic cores arranged in the radial direction, and these linear magnetic cores are Core-bonded bonded cores, and wires wound around linear cores and bonded cores. In addition, in order to make the reactance variable, no void is provided.

Conventionally, for example, as a three-phase reactor, generally, three cores ( winding core). Such a three-phase reactor is, for example, line-symmetrical with respect to the center line of the central winding core.

However, a three-phase reactor formed of three wire-symmetric winding cores has the following problem: the winding core (winding) in the center is unbalanced with the winding cores at both ends, so it is difficult to make R-phase, S-phase, and T-phase The inductances of these three phases are unified to a fixed value.

An object of the present invention is to provide a multi-phase reactor capable of unifying the inductance of each phase to a fixed value in view of the above-mentioned problems of the prior art.

Utility model content

According to one embodiment of the present invention, there is provided a multi-phase reactor comprising: a first core arranged at a central part; a plurality of second cores in which the magnetic circuit of the first core is annular; and one or more winding wires wound on the second cores.

Preferably, the second cores are formed in the same shape, and the second cores are arranged around the first core in rotational symmetry with respect to the center of the first core. Here, it is preferable that a predetermined gap is provided between the outer side of the first core and the second core. In addition, the multi-phase reactor may further include a gap member provided between the outer side of the first core and the second core and having a predetermined thickness.

It is also possible that the second core includes two radial legs and an outer peripheral part integrally formed, and one end of the two radial legs extends radially toward the outside of the first core, and the outer peripheral part The other ends of the two radial legs are connected, and each of the winding wires is wound around the corresponding radial legs. The outer shape of the first core can be a circular shape corresponding to the shape of one end of the radial leg of the plurality of second cores, or a circular shape corresponding to the shape of the radial leg of the plurality of second cores. The shape of one end corresponds to the shape of the polygon.

Preferably, the multiphase reactor further includes a core fixing member provided between outer peripheral portions of two adjacent second cores. In addition, the core fixing member may be formed of a material different from that of the plurality of second cores, or formed integrally with the second cores of the same material as that of the plurality of second cores. Furthermore, the core fixing member may be formed in a circular shape with the outer peripheral portion of the second core.

The core fixing member may be used for assembling or fixing the multiphase reactor. In addition, it is preferable that each of the core fixing members has predetermined holes. The multi-phase reactor may also be a three-phase reactor using three-phase AC. Here, an integer multiple of 3 is provided as a plurality of the second cores, and the winding wires wound on the integer multiples of 3 of the second cores can be aggregated into three.

Description of drawings

FIG. 1 is a diagram for explaining a first embodiment of a multiphase reactor according to the present invention.

Fig. 2 is a perspective view schematically showing the multiphase reactor of the first embodiment shown in Fig. 1 .

Fig. 3 is a diagram for explaining a second embodiment of the multi-phase reactor according to the present invention.

Fig. 4 is a diagram for explaining a third embodiment of the multiphase reactor according to the present invention.

Fig. 5 is a diagram for explaining a fourth embodiment of the multiphase reactor according to the present invention.

Fig. 6 is a diagram for explaining a fifth embodiment of the multiphase reactor according to the present invention.

Fig. 7 is a diagram for explaining a sixth embodiment of the multiphase reactor according to the present invention.

FIG. 8 is a waveform diagram showing an example of a three-phase AC supplied to the multiphase reactor shown in FIG. 7 .

Fig. 9 is a diagram (Part 1) for explaining the operation of the multi-phase reactor shown in Fig. 7 .

Fig. 10 is a diagram (part 2) for explaining the operation of the multiphase reactor shown in Fig. 7 .

Fig. 11 is a diagram (Part 3) for explaining the operation of the multi-phase reactor shown in Fig. 7 .

FIG. 12 is a diagram illustrating an example of a conventional multiphase reactor.

detailed description

First, before describing in detail an embodiment of the multiphase reactor according to the present invention, an example of a conventional multiphase reactor and its problems will be described with reference to FIG. 12 . FIG. 12 is a diagram for explaining an example of a conventional multi-phase reactor, and is used for explaining an example of a three-phase reactor.

As shown in FIG. 12 , the three-phase reactor includes an upper core 104 , a lower core 105 , and three winding cores 101 to 103 around which winding wires 110 to 130 for R phase, S phase, and T phase are respectively wound.

The winding cores 101 to 103 are respectively disposed between the upper core 104 and the lower core 105 with a gap d10 interposed therebetween. A winding 120 is wound around the winding core 102 , and a winding 130 is wound around the T-phase winding core 103 .

Here, in order to fix the inductance of each of the R-phase, S-phase, and T-phase, for example, the material, shape, and thickness of each of the winding cores 101 to 103 are made the same, and the winding cores 101 to 103 are arranged at equal intervals. . In addition, the number of turns of each of the winding wires 110 to 130 and the material, thickness, and the like of the wire rod are made the same.

That is, in a side view as shown in FIG. 12 , the winding cores 101 to 103 around which the winding wires 110 to 130 are wound are aligned with respect to the straight line L1-L1 connecting the centers of the central winding cores 102 in the vertical direction. symmetry.

However, in the three-phase reactor that is line-symmetrical with respect to the straight line L1-L1 as shown in FIG. The windings (110, 130) are unbalanced anyway, and it is difficult to make the inductances of the R-phase, S-phase, and T-phase constant.

Hereinafter, embodiments of the multi-phase reactor according to the present invention will be described in detail with reference to the accompanying drawings. In addition, in the following description, a three-phase reactor will be described as an example, but the application of the present invention is not limited to the three-phase reactor, and can be widely applied to multi-phase reactors requiring fixed inductance for each phase. In addition, the multiphase reactor according to the present invention is not limited to the primary side and the secondary side of inverters installed in industrial robots and machine tools, and can be applied to various devices.

FIG. 1 is a diagram for explaining a first embodiment of a multiphase reactor according to the present invention, and schematically shows an example of a three-phase reactor to which three-phase alternating current is applied. In FIG. 1 , reference numeral 1 denotes a core (winding core: second core) for the R phase in three-phase AC (R phase, S phase, and T phase), and 2 denotes a winding core for the S phase (the second core). 2 cores), 3 denotes a winding core (second core) for the T phase, and 4 denotes a center core (first core).

In addition, reference numeral 10 denotes a winding wire wound on the core 1 for the R phase, 20 denotes a winding wire wound around the core 2 for the S phase, and 30 denotes a winding wire wound around the core 3 for the T phase. Wire. That is, the three-phase (multi-phase) reactor of the first embodiment includes a central core 4 disposed at the central portion, three winding cores 1, 2, and 3 disposed outside the central core 4, and wound around Three winding wires 10 , 20 , 30 on these three winding cores 1 , 2 , 3 .

Here, the three winding cores 1 , 2 , and 3 are arranged with respect to the center core 4 such that respective magnetic paths MP1 , MP2 , and MP3 form ring shapes. In addition, a gap d is provided between the outer side of the center core 4 and both ends of the respective winding cores 1 , 2 , 3 . Here, when considered as a magnetic circuit, when the gap d is provided, the reluctance of the gap d is usually a dominant factor of the inductance of the reactor, and the inductance value is determined according to the gap d. In general, the inductance value is constant up to a large current. On the other hand, when the gap d is made small or zero, the reluctance of the iron constituting the iron core and the magnetic steel sheet becomes a dominant factor in the inductance, and generally speaking, it mainly applies to low current. In addition, the size of the reactor is also greatly different between the case where the gap d is provided and the case where the gap d is reduced or made zero.

In addition, the shapes of winding cores 1, 2, and 3 are the same, and the distances between adjacent two winding cores (1 and 2, 2 and 3, and 3 and 1) are made equal. That is, the three winding cores 1 , 2 , and 3 are arranged around the center core 4 so as to be rotationally symmetrical with respect to the center of the center core 4 . In addition, as a reactor, from the viewpoint of installing inductance, the shapes of winding cores 1, 2, and 3 do not have to be the same shape, and there is no physical problem even if they are not arranged in rotational symmetry. Also, of course, the size of the gap d is the same, and even if the gaps d of the winding cores 1, 2, and 3 are different, there is no physical problem.

In addition, the three winding cores 1, 2, and 3 can be formed from the same material (for example, by laminating electrical steel sheets such as silicon steel sheets), and the materials and thicknesses of the respective wire materials of the three windings 10, 20, and 30 can be adjusted. As well as the number of turns and winding spacing, etc. are the same. In addition, known various core materials and core shapes can be applied to form the winding cores 1 , 2 , 3 and the center portion core 4 . Thereby, three winding cores 1, 2, and 3 (three winding wires 10, 20, and 30) form equivalent winding cores, and have the same inductance value. In addition, when the gap is provided in the three winding cores 1, 2, 3, they have the same inductance value in the same manner. Here, it is only necessary for the air gap to exist in the magnetic circuit of the center core 4 , and, as described above, there may be no air gap. In addition, similarly to the winding cores 1, 2, and 3, even if the number of turns of the three winding wires 10, 20, and 30 is different, there is no physical problem.

FIG. 2 is a perspective view schematically showing the multi-phase reactor of the first embodiment shown in FIG. 1 , and schematically showing the three-phase reactor shown in FIG. 1 . As shown in FIG. 2 , for example, three wires with a central core 4 and three windings 10, 20, 30 (three winding cores 1, 2, 3) are held by an upper plate 51, a lower plate 52, and a case 53. phase reactor. Here, in the upper plate 51, the lower plate 52, and the casing 53, for example, a member ( Not shown), or heat dissipation slits (not shown) for dissipating heat from the three-phase reactor during use are naturally formed.

3 is a diagram for explaining a second embodiment of the polyphase reactor according to the present invention, showing six winding cores 1a, 2a, 3a, 1b, 2b, 3b (six windings 10a, 20a, 30a, 10b, 20b, 30b) are examples of three-phase reactors.

That is, as shown in FIG. 3 , the multiphase reactor of the second embodiment is, for example, wound on two winding cores 1a and 1b, 2a and 2b, 3a and 3b located on opposite sides of the central core 4. Three sets of lines 10a and 10b, 20a and 20b, and 30a and 30b correspond to R-phase, S-phase, and T, respectively, to form a three-phase reactor. Here, it goes without saying that the winding directions, connections, and the like of the respective sets of the two winding wires 10a and 10b, 20a and 20b, and 30a and 30b are all the same.

In this way, for example, a three-phase reactor is provided with an integer multiple of 3 (2 times in FIG. 3 ) winding cores, so that winding cores 1a, 2a, 3a, 1b, 2b, The windings 10a, 20a, 30a, 10b, 20b, and 30b on 3b are collectively divided into three of R phase, S phase, and T phase. Here, the multi-phase reactor shown in FIG. 3 can also directly make the six windings 10a, 20a, 30a, 10b, 20b, and 30b independent instead of using two windings as a set, thereby forming a six-phase reactor. Reactors are used.

Fig. 4 is a diagram for explaining a third embodiment of the multi-phase reactor according to the present invention, and schematically shows an example of a three-phase reactor. According to the comparison between Fig. 4 and the aforementioned Fig. 1, it is clear that in the three-phase reactor of the third embodiment, each winding core (second core) 1, 2 and 3 includes two radial leg portions 11, 1 and 3 respectively. 13, 21, 23 and 31, 33 and the outer peripheral parts 12, 22 and 32, one end of the two radial legs faces the outer side of the circular central part core (first core) 41 and extends radially. Connect the other ends of the 2 radial legs.

The end surface shape of one end of each radial leg part 11, 13, 21, 23 and 31, 33 is arc-shaped corresponding to the outer periphery of the circular center part core 41. As shown in FIG. In addition, a certain gap d is provided between one end of each radial leg and the outer periphery of the center core 41 .

Core fixing members 61 , 62 , 63 are respectively provided between outer peripheral portions 12 , 22 , 32 of two adjacent winding cores 1 , 2 , 3 . That is, the core fixing member 61 is provided between the outer peripheral portion 12 of the winding core 1 and the outer peripheral portion 22 of the winding core 2, and is provided between the outer peripheral portion 22 of the winding core 2 and the outer peripheral portion 32 of the winding core 3. There is a core fixing member 62 , and a core fixing member 63 is provided between the outer peripheral portion 32 of the winding core 3 and the outer peripheral portion 12 of the winding core 1 .

The winding wires 11c, 13c (21c, 23c, 31c, 33c) are respectively wound around the two radial leg portions 11, 13 (21, 23, 31, 33) of the winding core 1 (2, 3). In addition, the winding directions and connections of the winding wires 11c, 13c, 21c, 23c, 31c, and 33c on the respective winding cores 1, 2, and 3 are all made the same.

Here, as will be described later in detail with reference to FIGS. It needs to be made of the same material as the winding core (for example, electromagnetic steel plate), and it can also be made of plastic or the like. Furthermore, these core fixing members 61 , 62 , 63 are formed with predetermined holes ( 610 , 620 , 630 ), for example, and can be used to fix a three-phase reactor. In addition, a three-phase reactor can also be assembled using the core fixing members 61 , 62 , and 63 .

Fig. 5 is a diagram for explaining a fourth embodiment of a polyphase reactor according to the present invention, and the shape of the central core is different from that of the third embodiment described above. That is, as shown in FIG. 5, in the three-phase reactor of the fourth embodiment, the outer shape of the central core 42 is compatible with the radial leg portions 11, 13, 21, 23, The shape of one end of 31, 33 is a regular hexagon (hexagon) shape correspondingly. In addition, the shape of the end surface of one end of each radial leg part is a linear shape corresponding to each side of the center part core 42 of a regular hexagonal shape. In addition, a certain gap d is provided between one end of each radial leg and each side of the center core 42 .

In this way, the central portion core can have various shapes such as a circular shape and a polygonal shape based on the number of winding cores, the shape of the winding core, and the like. In addition, in the case of using electrical steel sheets such as silicon steel sheets to form the central core, for example, electrical steel sheets of the same shape can be laminated in thickness (for example, in the height direction in FIG. 2 ) to form the central core, as long as each winding core Given the same conditions (without breaking the symmetry), it is also possible to form the center core by using a cut core or the like.

FIG. 6 is a diagram for explaining a fifth embodiment of the multiphase reactor according to the present invention, in which a gap member 7 having a thickness d is provided with respect to the third embodiment described with reference to FIG. 4 . That is, it is also possible to make the gap member 7, for example, a cylindrical shape with a thickness d such as to wrap around the outer side of the cylindrical center core 41, and make the radial leg portions 11, 13, 21, One end of each of 23 , 31 , and 33 is in close contact with the outer side of the space member 7 .

Here, for example, when forming the center core 41 by laminating circular electrical steel sheets, the stacked plurality of circular electrical steel sheets are held by the gap member 7, and can be defined by the thickness of the gap member 7. The gap d between the center core 41 and each of the winding cores 1, 2, and 3 can reduce the burden on the assembly work of the reactor and stabilize the characteristics of the reactor. In addition, various materials including plastics can be applied as the gap member 7 .

In addition, in the third to fifth embodiments shown in FIGS. 4 to 6, when the core fixing members 61, 62, and 63 are formed of a material different from the winding cores 1, 2, and 3, such as plastic, Holes can be formed in the core fixing members 61 , 62 , 63 and utilized for assembling or fixing the three-phase reactor.

7 is a diagram for explaining the sixth embodiment of the polyphase reactor according to the present invention. In the third embodiment described with reference to FIG. 1, 2, and 3 form one. FIG. 8 is a waveform diagram showing an example of a three-phase AC supplied to the multiphase reactor shown in FIG. 7 . Here, in the multiphase reactor shown in FIG. 7 , the outer peripheral portions 12 , 22 , 32 and the core fixing members 61 , 62 , 63 form the same circular shape.

As explained with reference to FIG. 4 , winding wires 11c, 13c (21c, 23c, 31c, 33c), the winding directions and connections of these winding wires 11c, 13c, 21c, 23c, 31c, 33c are all the same.

Here, as shown in FIG. 8, the three-phase alternating currents for the R phase, S phase, and T phase whose phases (electrical angles) differ by 120° flow through the winding wires 11c, 13c, 21c, 23c and 31c, 33c. Thereby, a magnetic field as described with reference to FIGS. 9 to 11 is generated. FIGS. 9 to 11 are diagrams for explaining the operation of the multiphase reactor shown in FIG. 7 , and show the situation when the three-phase AC shown in FIG. 8 is supplied to the three-phase reactor of the sixth embodiment shown in FIG. 7 . situation.

(a) of Fig. 9 and (b) of Fig. 9 represent the situation that the electric angle in the waveform diagram of the three-phase alternating current (voltage, current) shown in Fig. 8 is 0 °, (a) of Fig. 10 and Fig. 10 (b) shows the case where the electrical angle is 60°, and FIG. 11(a) and FIG. 11(b) show the case where the electrical angle is 250°. In addition, (a) of FIG. 9, (a) of FIG. 10 and (a) of FIG. (b) shows the magnetic flux density diagram at each electrical angle. In addition, the magnetic flux diagram represents the flow of magnetic flux, and the interval between the lines of the magnetic flux diagram represents the intensity of magnetic flux. In addition, in FIG. 9(a), FIG. 9(b) to FIG. 11(a), and FIG. 11(b), each three-phase reactor and the three-phase reactor shown in FIG. 7 are clockwise The corresponding three-phase reactor obtained by rotating 30°.

First, in the three-phase AC shown in FIG. 8 , when the electrical angle is 0°, the magnetic flux line diagram and the magnetic flux density diagram are as shown in FIG. 9( a ) and FIG. 9( b ). That is, it can be seen that the magnetic flux density of the radial leg portions 11 and 13 is increased by the winding wires 11 c and 13 c of the winding core 1 , and that a large magnetic flux flows through the winding core 1 . In addition, it can be seen that a predetermined magnetic flux flows through the winding cores 2 and 3 , though it is smaller than the magnetic flux flowing through the winding core 1 .

In contrast, it can be seen that between the outer peripheral parts 12 and 22, 22 and 32, and 32 and 12 of two adjacent winding cores, that is, between the winding cores 1, 2, and 3, the core fixing member 61, The positions corresponding to 62 and 63 have no magnetic flux flow.

Next, in the three-phase AC shown in FIG. 8 , when the electrical angle is 60°, the magnetic flux line diagram and the magnetic flux density diagram are as shown in FIG. 10( a ) and FIG. 10 ( b ). That is, it can be seen that the magnetic flux density of the radial leg portions 31 and 33 is increased by the winding wires 31 c and 33 c of the winding core 3 , and that a large magnetic flux flows through the winding core 3 . In addition, it can be seen that a predetermined magnetic flux flows through the winding cores 1 and 2 , though it is smaller than the magnetic flux flowing through the winding core 3 .

In contrast, it can be seen that between the outer peripheral parts 12 and 22, 22 and 32, and 32 and 12 of two adjacent winding cores, that is, between the winding cores 1, 2, and 3, the core fixing member 61, The positions corresponding to 62 and 63 have no magnetic flux flow.

In addition, in the three-phase AC shown in FIG. 8 , when the electrical angle is 250°, the magnetic flux line diagram and the magnetic flux density diagram are as shown in FIG. 11( a ) and FIG. 11 ( b ). That is, it can be seen that the magnetic flux density of the radial leg portions 31 and 33 is increased by the winding wires 31 c and 33 c of the winding core 3 , and that a large magnetic flux flows through the winding core 3 . In addition, it can be seen that a predetermined magnetic flux also flows through the winding core 2, although it is smaller than the magnetic flux flowing through the winding core 3, and a certain degree of magnetic flux still flows through the winding core 1, although it is smaller than the magnetic flux flowing through the winding core 3. The magnetic flux of cores 2 and 3 is small.

In contrast, it can be seen that between the outer peripheral parts 12 and 22, 22 and 32, and 32 and 12 of two adjacent winding cores, that is, between the winding cores 1, 2, and 3, the core fixing member 61, The positions corresponding to 62 and 63 have no magnetic flux flow.

Fig. 9, Fig. 10 and Fig. 11 show the situation that electrical angle is 0 °, 60 ° and 250 °, but the situation that electrical angle is other angles is also the same, between the winding core 1, 2, 3 that is positioned at adjacent. The positions corresponding to the core fixing members 61, 62, and 63 between the cores always have no magnetic flux flow. In addition, in Fig. 9(a), Fig. 10(a) and Fig. 11(a), one magnetic flux line is included at the position corresponding to the core fixing members 61, 62, 63, but according to Fig. 9 (b), (b) of FIG. 10 , and (b) of FIG. 11 , it is clear that no magnetic flux flows even if this one wire enters.

As its first basis, it is based on the following physical law: As a whole reactor, the magnetic flux will pass through the path of the smallest magnetic energy formed by the magnetic flux (such as winding core 1, 2, 3), that is, if it is in the same On the core, the magnetic flux follows the shortest path. In addition, as the second basis, for example, in the case of three-phase AC, it is based on the physical characteristics of the following three-phase AC: if the central part core 4 is considered, it can be known that from the winding cores 1, 2, The total flux sum of 3 is always zero.

In this way, the sixth embodiment shown in FIG. 7, for example, forms the core fixing members 61, 62, 63 with the winding cores 1, 2, 3 (with the same material), even in this case, the core fixing member 61 , 62, 63 also has no magnetic flux flow all the time. Therefore, for example, holes 610 , 620 , 630 can also be formed in the core fixing members 61 , 62 , 63 and utilized for assembling or fixing a three-phase reactor.

Also, the above-described embodiments can be combined appropriately. For example, it is also possible to apply the fifth embodiment shown in FIG. 6 to the sixth embodiment shown in FIG. The fifth embodiment shown is applied to the fourth embodiment shown in FIG. 5 , and it goes without saying that the interstitial member 7 having a thickness d is provided outside the central core 42 of the hexagonal shape. As described above in detail, according to the multilayer reactors according to the embodiments of the present invention, it is possible to obtain constant inductance in each phase.

According to the multi-phase reactor according to the present invention, it is possible to unify the inductance of each phase to a fixed value.

The embodiments have been described above, but all the examples and conditions described here are written to help the understanding of the concept of the utility model applied in the utility model and technology, and it is not expected that the examples and conditions described in particular have any influence on the concept of the utility model. The scope is limited. In addition, such a description in the specification does not indicate the advantages and disadvantages of the utility model. It should be understood that, although the embodiments of the invention have been described in detail, various changes, substitutions, and deformations can be made without departing from the spirit and scope of the invention.

Claims (16)

1. A polyphase reactor, characterized in that, possesses: the first core configured in the central part; a plurality of second cores disposed outside the first core and arranged in a ring shape with respect to a magnetic circuit of the first core; and One or more windings wound on the second core. 2. The multi-phase reactor according to claim 1, characterized in that, The second cores are formed in the same shape. 3. The multiphase reactor according to claim 1, characterized in that, The second core is arranged around the first core in rotational symmetry with respect to the center of the first core. 4. The multi-phase reactor according to any one of claims 1 to 3, characterized in that, A predetermined gap is provided between the outer side of the first core and the second core. 5. The multiphase reactor according to any one of claims 1 to 3, characterized in that, A gap member is further provided. The gap member is provided between the outer side of the first core and the second core and has a predetermined thickness. 6. The multiphase reactor according to any one of claims 1 to 3, characterized in that, The second core integrally includes two radial legs and an outer peripheral portion, one end of the two radial legs radially extends outwardly of the first core, and the outer peripheral portion connects the two radial legs. The other end of the radial leg is connected, Each of the winding wires is wound on the corresponding radial leg. 7. The multiphase reactor according to claim 6, characterized in that, The outer shape of the first core is a circular shape corresponding to the shape of one end of the radial leg of the plurality of second cores. 8. The multiphase reactor according to claim 6, characterized in that, The outer shape of the first core is a polygonal shape corresponding to the shape of one end of the radial leg portions of the plurality of second cores. 9. The multiphase reactor according to claim 6, characterized in that, A core fixing member provided between the outer peripheral portions of two adjacent second cores is further provided. 10. The multiphase reactor according to claim 9, characterized in that, The core fixing member is formed of a material different from that of the plurality of second cores. 11. The multiphase reactor according to claim 9, characterized in that, The core fixing member is integrally formed with the second cores using the same material as the plurality of second cores. 12. The multiphase reactor according to claim 9, characterized in that, The core fixing member is formed in a circular shape with an outer peripheral portion of the second core. 13. The multi-phase reactor according to claim 9, characterized in that, The core fixing member is used for assembling or fixing the multiphase reactor. 14. The multiphase reactor according to claim 13, characterized in that, The core fixing members each have prescribed holes. 15. The multiphase reactor according to any one of claims 1 to 3, characterized in that, The multi-phase reactor is a three-phase reactor using three-phase AC. 16. The multiphase reactor according to claim 15, characterized in that, A plurality of said second cores are provided with integer multiples of 3, The number of winding wires wound on the second cores that are an integer multiple of 3 is 3 in total.