Polyphase reactor

Abstract

Provided is a polyphase reactor capable of suppressing temperature deviation. A polyphase reactor (1) includes a first outer coil (11), a second outer coil (13), at least one inner coil (12) disposed between the first outer coil (11) and the second outer coil (13), a core (20) including a first outer core portion (21), a second outer core portion (23), and an inner core portion (22), and a cooling portion (30). The length (Lb2) of an opposing surface (22a) of the inner core portion (22) that opposes the cooling portion (30) is greater than the length (Lb1) of an opposing surface (21a) of the first outer core portion (21) that opposes the cooling portion (30) and greater than the length (Lb3) of an opposing surface (23a) of the second outer core portion (23) that opposes the cooling portion (30).

Description

TECHNICAL FIELD

[0001] The present application relates to a multiphase reactor. BACKGROUND

[0002] In a DC-DC converter of an electric vehicle, a HEV (Hybrid Electrical Vehicle), and the like, a reactor configured by mounting a coil around a core is used. In recent years, in order to adjust fluctuation of an output current of the DC-DC converter, a multiphase reactor of a multiphase system is known.

[0003] For example, a three-phase reactor is disclosed in Patent Literature 1, and a four-phase reactor is disclosed in Patent Literature 2. The reactor is a heat generating component, and thus cooling needs to be appropriately performed.

[0004] PRIOR ART DOCUMENTS

[0005] PATENT LITERATURE

[0006] Patent Literature 1: Japanese Patent Application Laid-Open No. 2002-208519

[0007] Patent Literature 2: Japanese Patent No. 6518603 SUMMARY

[0008] PROBLEMS TO BE SOLVED BY THE INVENTION

[0009] However, in the multiphase reactor of three phases or more, there is a problem that heat is more likely to accumulate in the inner coil and the inner core portion in which the inner coil is wound, compared to the pair of outer coils and the outer core portion in which the outer coils are wound, and thus a temperature deviation occurs in the multiphase reactor.

[0010] The present application provides a multiphase reactor capable of suppressing a temperature deviation.

[0011] MEANS FOR SOLVING THE PROBLEMS

[0012] The present application provides a multiphase reactor including:

[0013] a first outer coil;

[0014] a second outer coil;

[0015] at least one inner coil disposed between the first outer coil and the second outer coil;

[0016] a core including a first outer core portion in which the first outer coil is wound, a second outer core portion in which the second outer coil is wound, and an inner core portion in which the at least one inner coil is wound, and

[0017] cooling portion,

[0018] The first outer coil, the second outer coil, and the at least one inner coil are respectively arranged in a first direction and arranged in a second direction orthogonal to the first direction,

[0019] The cooling portion is arranged on one side of the first outer coil, the second outer coil, and the at least one inner coil in a third direction orthogonal to the first direction and the second direction,

[0020] In a cross section orthogonal to the first direction,

[0021] A length of an opposite surface of the at least one inner core portion opposite to the cooling portion is greater than a length of an opposite surface of the first outer core portion opposite to the cooling portion and greater than a length of an opposite surface of the second outer core portion opposite to the cooling portion.

[0022] In addition, the present application provides a multi-phase reactor including:

[0023] A first outer coil;

[0024] A second outer coil;

[0025] At least one inner coil arranged between the first outer coil and the second outer coil;

[0026] A core including a first outer core portion in which the first outer coil is wound, a second outer core portion in which the second outer coil is wound, and an inner core portion in which the at least one inner coil is wound, and

[0027] A cooling portion,

[0028] The first outer coil, the second outer coil, and the at least one inner coil are respectively arranged in a first direction and arranged in a second direction orthogonal to the first direction,

[0029] The cooling portion is arranged on one side of the first outer coil, the second outer coil, and the at least one inner coil in a third direction orthogonal to the first direction and the second direction,

[0030] In a cross section orthogonal to the first direction,

[0031] A length of an opposite surface of the at least one inner coil opposite to the cooling portion is greater than a length of an opposite surface of the first outer coil opposite to the cooling portion and greater than a length of an opposite surface of the second outer coil opposite to the cooling portion.

[0032] Effects of the Invention

[0033] According to the present application, the cooling of the inner coil and the inner core portion, which are subject to temperature rise due to heat accumulation, is facilitated, and temperature deviation can be suppressed. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 is a circuit diagram showing one example of a three-phase interleaved DC-DC converter of a multiphase reactor 1 to which an embodiment of the present application can be applied.

[0035] Figure 2 is a perspective view of the multiphase reactor 1.

[0036] Figure 3 is a view showing a core 20 of the multiphase reactor 1.

[0037] Figure 4 is a cross-sectional view of the multiphase reactor of the first embodiment taken along line A-A of Figure 3

[0038] Figure 5 is a cross-sectional view of the multiphase reactor of the second embodiment taken along line A-A of Figure 3

[0039] Figure 6 is a cross-sectional view of the multiphase reactor of the prior art taken along line A-A of Figure 3

[0040] REFERENCE NUMERALS

[0041] 1 multiphase reactor

[0042] 11 first outer coil

[0043] 11a opposing surface of the first outer coil

[0044] 12 inner coil

[0045] 12a opposing surface of the inner coil

[0046] 13 second outer coil

[0047] 13a opposing surface of the second outer coil

[0048] 20 core

[0049] 21 first outer core portion

[0050] 21a opposing surface of the first outer core portion

[0051] 22 inner core portion

[0052] 22a opposing surface of the inner core portion

[0053] 23 second outer core portion​​​

[0054] 23a opposing surface of the second outer core portion

[0055] 30 cooling portion

[0056] 40 housing

[0057] 41 bottom portion

[0058] 42 side wall portion

[0059] 43 opening portion DETAILED DESCRIPTION

[0060] Hereinafter, an embodiment of the present application will be described with reference to the drawings.

[0061] Figure 1 is a circuit diagram showing an example of a three-phase reactor as a multi-phase reactor of an embodiment of the present application.

[0062] Figure 1 The three-phase interleaved DC-DC converter 10 shown in the figure is provided with a smoothing capacitor Cl, a multi-phase reactor 1 having three coils 11 to 13, switching sections SW1, SW2, SW3, SW4, SW5, SW6, and a smoothing capacitor C2.

[0063] The DC-DC converter steps up the input voltage VI when operating with the voltage VI on the smoothing capacitor Cl side as the input voltage and the voltage V2 on the smoothing capacitor C2 side as the output voltage.

[0064] The output terminal of the coil 11 of the multi-phase reactor 1 is connected to the intermediate node of the switching section SW1 and the switching section SW2 connected in series, constituting a first voltage conversion section 14. The output terminal of the coil 12 of the multi-phase reactor 1 is connected to the intermediate node of the switching section SW3 and the switching section SW4 connected in series, constituting a second voltage conversion section 15. The output terminal of the coil 13 of the multi-phase reactor 1 is connected to the intermediate node of the switching section SW5 and the switching section SW6 connected in series, constituting a third voltage conversion section 16. The switching sections SW1, SW2, SW3, SW4, SW5, SW6 each have a switching element such as an IGBT (Insulated Gate Bipolar Transistor) and a freewheeling diode connected in parallel to the switching element.

[0065] The switching elements of the switching sections SW1 to SW6 are controlled to be turned on and off in accordance with signals from a not-shown switching control section. The three voltage conversion sections 14, 15, 16 of the DC-DC converter 10 are connected in parallel, and by switching the switching elements of at least one of the voltage conversion sections 14, 15, 16 to be turned on and off at a desired timing, the voltage VI is boosted in a direct current state and the voltage V2 is output. The switching elements of the voltage conversion sections 14, 15, 16 are switched to be turned on and off by switching signals that are pulsed and have a prescribed duty ratio from the switching control section to the DC-DC converter 10.

[0066] When the switching elements of the voltage conversion sections 14, 15, 16 are switched to be turned on and off, in the on operation, the input current to the DC-DC converter 10 flows to the switching element side, and the polyphase reactor 1 accumulates energy, and in the off operation, the input current to the DC-DC converter 10 flows to the diode side, and the polyphase reactor 1 discharges the accumulated energy. When only one of the three voltage conversion sections 14, 15, 16 of the DC-DC converter 10 is driven, a current that flows through the voltage conversion section of the DC-DC converter 10 in the off operation is output. Also, in the case where two of the three voltage conversion sections 14, 15, 16 of the DC-DC converter 10 are driven, interlaced control is performed in which the switching phases of the driven voltage conversion sections 14, 15, 16 are each shifted by 180 degrees. In the case where all of the three voltage conversion sections 14, 15, 16 of the DC-DC converter 10 are driven, interlaced control is performed in which the switching phases of the voltage conversion sections 14, 15, 16 are each shifted by 120 degrees.

[0067] The polyphase reactor 1 is a heating component that generates heat during operation by winding the coils 11 to 13 around the core 20. Therefore, when the polyphase reactor 1 is used, it is necessary to maintain the temperature below a heat-resistant temperature and to cool it appropriately. Hereinafter, the structure and the cooling action of the polyphase reactor 1 will be described. In the following description, the coils 11, 13 disposed on the outer side of the three coils 11 to 13 will be referred to as first outer side coils 11, second outer side coils 13, and the coil 12 sandwiched by the first outer side coils 11 and the second outer side coils 13 will be referred to as an inner side coil 12. Also, as shown in FIG. 1, the positional relationship of the parts of the polyphase reactor 1 is described using an orthogonal coordinate system of X, Y, Z axes. Figures 2 to 5

[0068] The polyphase reactor 1 is provided with the first outer side coils 11, the second outer side coils 13, the inner side coil 12, the core 20, the cooling section 30, and a housing 40 that accommodates them.

[0069] ​The iron core 20 is, for example, constructed by stacking thin sheet-like electromagnetic steel plates. Figure 3 As shown, the core 20 includes: a first outer core portion 21, an inner core portion 22, and a second outer core portion 23, which extend along the X-axis and are arranged parallel to each other along the Y-axis; a first connecting portion 24, which extends along the Y-axis at one end in the X-axis direction and connects the first outer core portion 21, the inner core portion 22, and the second outer core portion 23; and a second connecting portion 25, which extends along the Y-axis at the other end in the X-axis direction and connects the first outer core portion 21, the inner core portion 22, and the second outer core portion 23. The X-axis direction is the first direction of the present invention, and the Y-axis direction is the second direction of the present invention.

[0070] A first outer coil 11 is wound on the first outer core portion 21, a second outer coil 13 is wound on the second outer core portion 23, and an inner coil 12 is wound on the inner core portion 22. Therefore, the first outer core portion 21, the inner coil 12, and the second outer coil 13 are respectively arranged along the X-axis direction and are arranged along the Y-axis direction.

[0071] In this multiphase reactor 1, even with any combination, the magnetic flux generated by each coil 11, 12, and 13 is in opposite directions, and the magnetic flux cancels each other out. Therefore, the amount of magnetic flux cancellation generated by each coil 11, 12, and 13 is equal, which can suppress the magnetic saturation of the iron core 20.

[0072] The housing 40 includes: a generally rectangular bottom 41 disposed on one side in the Z-axis direction and extending along the X-axis and Y-axis directions; a side wall portion 42 extending from the outer edge of the bottom 41 to the other side in the Z-axis direction; and an opening portion 43 surrounded by the side wall portion 42 and opening on the other side in the Z-axis direction opposite to the bottom 41.

[0073] The cooling section 30 is disposed between the bottom 41 and the core 20, and is arranged on one side of the first outer coil 11, the second outer coil 13, and the inner coil 12 in the Z-axis direction along the X-axis and Y-axis directions. The cooling section 30 may be a circulating cooling section with a refrigerant passage for refrigerant flow, or it may be a storage cooling section.

[0074] Figure 6is a sectional view of the existing polyphase reactor. The core of the existing ordinary polyphase reactor 1P is composed of outer core portions 21P, 23P having the same shape of square or rectangular cross section with the same length (L) of upper and lower sides, and an inner coil 12P. In such an existing polyphase reactor, heat is more likely to accumulate in the inner coil 12P and the inner core portion 22P in which the inner coil 12P is wound, compared with a pair of outer coils 11P, 13P and the outer core portions 21P, 23P in which the outer coils 11P, 13P are wound, thereby causing a temperature deviation in the polyphase reactor 1P.

[0075] Therefore, in the present embodiment, in Figure 4 and Figure 5 the cross section shown, the shape of the core 20 is set such that the length Lb2 of the opposing surface 22a of the inner core portion 22 opposing the cooling portion 30 is greater than the length Lbl of the opposing surface 21a of the first outer core portion 21 opposing the cooling portion 30, and greater than the length Lb3 of the opposing surface 23a of the second outer core portion 23 opposing the cooling portion 30. Thus, the area of the inner core portion 22 opposing the cooling portion 30 is greater than the areas of the first outer core portion 21 and the second outer core portion 23 opposing the cooling portion 30. Therefore, cooling of the inner core portion 22, which is temperature- raised due to heat accumulation, is promoted, and a temperature deviation among the first outer core portion 21, the second outer core portion 23, and the inner core portion 22 can be suppressed.

[0076] Likewise, when the relationship is expressed in terms of coils, the shape of the core 20 is set such that the length of the opposing surface 12a of the inner coil 12 opposing the cooling portion 30 is greater than the length of the opposing surface 11a of the first outer coil 11 opposing the cooling portion 30, and greater than the length of the opposing surface 13a of the second outer coil 13 opposing the cooling portion 30. Thus, the area of the inner coil 12 opposing the cooling portion 30 is greater than the areas of the first outer coil 11 and the second outer coil 13 opposing the cooling portion 30. Therefore, cooling of the inner coil 12, which is temperature- raised due to heat accumulation, is promoted, and a temperature deviation among the first outer coil 11, the second outer coil 13, and the inner coil 12 can be suppressed.

[0077] Further, the opposing surfaces 11a, 12a, 13a can or can not directly abut the cooling portion 30. When not directly abutting the cooling portion 30, they can be separated by an adhesive having good thermal conductivity, a thermally conductive sheet, or the like. As a structure that embodies such a relationship, two embodiments are described below.

[0078] [First Embodiment]

[0079] In Figure 4In the first embodiment shown, the cross section of the inner core portion 22 has a trapezoidal shape, and is configured so that the opposing surface 22a of the inner core portion 22 opposite the cooling portion 30 becomes the lower base of the trapezoidal shape, and the upper surface 22b becomes the upper base of the trapezoidal shape. More specifically, the inner core portion 22 is formed so as to be linearly symmetrical with respect to the center in the Y-axis direction. Figure 6 In the existing polyphase reactor 1P shown, the length Lb2 of the opposing surface 22a of the inner core portion 22 is lengthened by 2A (L+2A) in the Y-axis direction, and correspondingly, the length Lu2 of the upper surface 22b is shortened by 2A (L-2A) in the Y-axis direction, and is formed linearly symmetrical with respect to the center in the Y-axis direction.

[0080] The first outer core portion 21 and the second outer core portion 23 are configured so that the lengths Lu1, Lu3 of the upper surfaces 22b are lengthened by A (L+A) in the Y-axis direction, and the lengths Lb1, Lb3 of the opposing surfaces 21a are shortened by A (L-A) in the Y-axis direction, and the inner side surface adjacent to the inner core portion 22 is substantially parallel to the outer side surface of the inner core portion 22. In the case of the existing polyphase reactor 1P shown, Figure 4 In the core 20 shown, the first outer coil 11, the second outer coil 13, and the inner coil 12 each have the same area. Also, if the height (length in the Z-axis direction) of the core is made the same as that of the existing polyphase reactor 1P, the first outer coil 11, the second outer coil 13, and the inner coil 12 also have the same area.

[0081] [Second Embodiment]

[0082] In the case of the existing polyphase reactor 1P shown, Figure 5 In the second embodiment shown, the cross section of the inner core portion 22 has a trapezoidal shape, and is configured so that the opposing surface 22a of the inner core portion 22 opposite the cooling portion 30 becomes the lower base of the trapezoidal shape, and the upper surface 22b becomes the upper base of the trapezoidal shape. More specifically, the inner core portion 22 is formed so as to be linearly symmetrical with respect to the center in the Y-axis direction. Figure 6 In the core of the existing polyphase reactor 1P shown, the length Lb2 of the opposing surface 22a of the inner core portion 22 is lengthened by 2A (L+2A) in the Y-axis direction, and correspondingly, the length Lu2 of the upper surface 22b is shortened by 2A (L-2A) in the Y-axis direction, and is formed linearly symmetrical with respect to the center in the Y-axis direction.

[0083] The first outer core portion 21 and the second outer core portion 23 have a trapezoidal shape in cross section, and are configured so that the opposing surfaces 21a, 23a of the first outer core portion 21 and the second outer core portion 23 opposite the cooling portion 30 become the upper base of the trapezoidal shape, and the upper surfaces 21b, 23b become the lower base of the trapezoidal shape. More specifically, the first outer core portion 21 and the second outer core portion 23 are formed so as to be linearly symmetrical with respect to the center in the Y-axis direction. Figure 6In the illustrated existing polyphase reactor 1P, the lengths Lb1, Lb3 of the opposing surfaces 21a, 23a of the first and second outer core portions 21, 23 are shortened by 2A (L-2A) in the Y-axis direction, the lengths Lu1, Lu3 of the upper surfaces 21b, 23b are correspondingly lengthened by 2A (L+2A) in the Y-axis direction, and the center with respect to the Y-axis direction is formed linearly symmetrically.

[0084] In the illustrated core 20, the first outer coil 11, the second outer coil 13, and the inner coil 12 also each have the same area. In addition, even if the height (length in the Z-axis direction) of the core is made the same as that of the existing coil, the first outer coil 11, the second outer coil 13, and the inner coil 12 also have the same area. Figure 5

[0085] Thus, in any of the embodiments, the length Lb2 of the opposing surface 22a of the inner core portion 22, which opposes the cooling portion 30, can be easily made longer than the lengths Lb1, Lb3 of the opposing surfaces 21a, 23a of the first and second outer core portions 21, 23, which oppose the cooling portion 30, and thus the temperature deviation of the first outer coil 11, the second outer coil 13, and the inner coil 12 can be suppressed.

[0086] The various embodiments have been described above with reference to the accompanying drawings, but the present application is of course not limited to these examples. It will be apparent to those skilled in the art that various modifications or corrections can be made within the scope of the claims, and it should be understood that these modifications or corrections also belong to the technical scope of the present application. Furthermore, the constituent elements in the above-described embodiments can be arbitrarily combined within the scope of the present application.

[0087] In the present specification, at least the following matters are described. Furthermore, the corresponding constituent elements and the like in the above-described embodiments are shown in parentheses, but the present application is not limited thereto.

[0088] (1) A polyphase reactor (polyphase reactor 1) comprising:

[0089] a first outer coil (first outer coil 11);

[0090] a second outer coil (second outer coil 13);

[0091] at least one inner coil (inner coil 12) disposed between the first outer coil and the second outer coil;

[0092] ​A core (core 20) includes: a first outer core portion (first outer core portion 21) in which the first outer coil is wound; a second outer core portion (second outer core portion 23) in which the second outer coil is wound; and an inner core portion (inner core portion 22) in which the at least one inner coil is wound; and

[0093] A cooling portion (cooling portion 30),

[0094] The first outer coil, the second outer coil, and the at least one inner coil are respectively provided in a first direction (X-axis direction) and arranged in a second direction (Y-axis direction) orthogonal to the first direction,

[0095] The cooling portion is arranged on one side of the first outer coil, the second outer coil, and the at least one inner coil in a third direction (Z-axis direction) orthogonal to the first direction and the second direction,

[0096] In a cross section orthogonal to the first direction,

[0097] A length (length Lb2) of an opposite surface (opposite surface 22a) of the at least one inner core portion opposite to the cooling portion is greater than a length (length Lb1) of an opposite surface (opposite surface 21a) of the first outer core portion opposite to the cooling portion and greater than a length (length Lb3) of an opposite surface (opposite surface 23a) of the second outer core portion opposite to the cooling portion.

[0098] According to (1), the area of the inner core portion opposite to the cooling portion is greater than the areas of the first outer core portion and the second outer core portion opposite to the cooling portion, and thus, cooling of the inner core portion, which is likely to increase in temperature due to heat accumulation, is promoted, and temperature deviation among the first outer core portion, the second outer core portion, and the inner core portion can be suppressed.

[0099] (2) A multiphase reactor (multiphase reactor 1) includes:

[0100] A first outer coil (first outer coil 11);

[0101] A second outer coil (second outer coil 13);

[0102] At least one inner coil (inner coil 12) arranged between the first outer coil and the second outer coil;

[0103] A core (core 20) includes: a first outer core portion (first outer core portion 21) in which the first outer coil is wound; a second outer core portion (second outer core portion 23) in which the second outer coil is wound; and an inner core portion (inner core portion 22) in which the at least one inner coil is wound; and

[0104] A cooling portion (cooling portion 30),

[0105] The first outer coil, the second outer coil, and the at least one inner coil are respectively provided extending in a first direction (X-axis direction) and arranged in a second direction (Y-axis direction) orthogonal to the first direction,

[0106] The cooling portion is arranged on one side of the first outer coil, the second outer coil, and the at least one inner coil in a third direction (Z-axis direction) orthogonal to the first direction and the second direction,

[0107] In a cross section orthogonal to the first direction,

[0108] A length of an opposite surface (opposite surface 12a) of the at least one inner coil opposite to the cooling portion is greater than a length of an opposite surface (opposite surface 11a) of the first outer coil opposite to the cooling portion and greater than a length of an opposite surface (opposite surface 13a) of the second outer coil opposite to the cooling portion.

[0109] According to (2), the area of the inner coil opposite to the cooling portion is greater than the areas of the first outer coil and the second outer coil opposite to the cooling portion, and thus cooling of the inner coil, which is likely to increase in temperature due to heat accumulation, is promoted, and temperature deviation among the first outer coil, the second outer coil, and the inner coil can be suppressed.

[0110] (3) The multiphase reactor according to (1) or (2), wherein

[0111] In the cross section,

[0112] The inner core portion has a trapezoidal shape,

[0113] The opposite surface of the inner core portion opposite to the cooling portion is a lower base of the trapezoidal shape.

[0114] According to (3), it is easy to make the length of the opposite surface of the inner core portion opposite to the cooling portion greater than the lengths of the opposite surfaces of the first outer core portion and the second outer core portion opposite to the cooling portion.

[0115] (4) The multiphase reactor according to any one of (1) to (3), wherein

[0116] In the cross section,

[0117] The first outer core portion and the second outer core portion have a trapezoidal shape,

[0118] The opposing surface of the first outer core portion and the opposing surface of the second outer core portion, which are opposite the cooling portion, are upper bases of the trapezoidal shape.

[0119] According to (4), it is possible to easily make the length of the opposing surface of the inner core portion, which is opposite the cooling portion, longer than the length of the opposing surface of the first outer core portion and the second outer core portion, which are opposite the cooling portion.

[0120] (5) The polyphase reactor according to any one of (1) to (4), wherein,

[0121] Further, a housing (housing 40) that houses the first outer coil, the second outer coil, the inner coil, the core, and the cooling portion is provided,

[0122] The housing has:

[0123] a bottom portion (bottom portion 41);

[0124] a side wall portion (side wall portion 42) that is provided standing from the bottom portion; and

[0125] an opening portion (opening portion 43) that is surrounded by the side wall portion and is opposite the bottom portion,

[0126] The cooling portion is provided between the bottom portion and the core.

[0127] According to (5), the operability of the polyphase reactor is improved.

Claims

1. A multiphase reactor, comprising: First outer coil; Second outer coil; At least one inner coil is disposed between the first outer coil and the second outer coil; A core comprising: a first outer core portion on which the first outer coil is wound; a second outer core portion on which the second outer coil is wound; and an inner core portion on which at least one inner coil is wound; and... Cooling section The first outer coil, the second outer coil, and the at least one inner coil each extend along a first direction and are arranged along a second direction orthogonal to the first direction. The cooling section is disposed on one side of the first outer coil, the second outer coil, and the at least one inner coil in a third direction orthogonal to the first and second directions. in, In the cross section orthogonal to the first direction, The length of at least one of the inner core portions facing the cooling portion is greater than the length of the first outer core portion facing the cooling portion, and also greater than the length of the second outer core portion facing the cooling portion. The inner core portion has a trapezoidal shape. The opposing surface of the inner core, which is opposite to the cooling section, is the lower base of the trapezoidal shape. The first outer core portion and the second outer core portion have a trapezoidal shape. The opposing surfaces of the first outer core and the second outer core that are opposite to the cooling portion are the upper bases of the trapezoidal shape.

2. A multiphase reactor, comprising: First outer coil; Second outer coil; At least one inner coil is disposed between the first outer coil and the second outer coil; A core comprising: a first outer core portion on which the first outer coil is wound; a second outer core portion on which the second outer coil is wound; and an inner core portion on which at least one inner coil is wound; and... Cooling section The first outer coil, the second outer coil, and the at least one inner coil each extend along a first direction and are arranged along a second direction orthogonal to the first direction. The cooling section is disposed on one side of the first outer coil, the second outer coil, and the at least one inner coil in a third direction orthogonal to the first and second directions. in, In the cross section orthogonal to the first direction, The length of the opposing surface of the at least one inner coil opposite the cooling section is greater than the length of the opposing surface of the first outer coil opposite the cooling section, and also greater than the length of the opposing surface of the second outer coil opposite the cooling section. The inner core portion has a trapezoidal shape. The opposing surface of the inner core, which is opposite to the cooling section, is the lower base of the trapezoidal shape. The first outer core portion and the second outer core portion have a trapezoidal shape. The opposing surfaces of the first outer core and the second outer core that are opposite to the cooling portion are the upper bases of the trapezoidal shape.

3. The multiphase reactor according to claim 1 or 2, wherein, It also includes a housing that houses the first outer coil, the second outer coil, the inner coil, the core, and the cooling section. The housing includes: bottom; The sidewall portion, which is erected from the bottom; and The opening is surrounded by the sidewall portion and faces the bottom. The cooling section is disposed between the bottom and the core.

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