JP6513956B2 - Magnetic coupling type reactor - Google Patents

Description

  The present invention relates to a reactor in which a core is insulated and coated, and more particularly to a reactor used for a vehicle or the like.

  Reactors are used in various applications, including drive systems for hybrid vehicles, electric vehicles, and fuel cell vehicles. For example, as a reactor used for a booster circuit for vehicles, after winding a coil on a resin bobbin disposed around an annular core, these are accommodated in a metal case, and a filling material is poured into the case. Hardened ones are often used.

  A magnetically coupled reactor is known as this type of reactor. The magnetically coupled reactor makes it difficult for the core to saturate by generating magnetic flux in a canceling direction, and enables miniaturization by suppressing ripples using leakage inductance. As shown in FIG. 11, the magnetically coupled reactor includes an annular core 101 and a pair of coils 105 mounted on opposing legs of the annular core 101. The magnetically coupled reactor has the above-mentioned advantages, but generates a magnetic flux in the canceling direction, so that the passage of the magnetic flux passing through the annular core 101 is eliminated. Therefore, as shown in FIG. 12, a large amount of magnetic flux leaks to the outside of the reactor.

JP 2011-124267 A

  When two or more magnetically coupled reactors are arranged, the leakage magnetic fluxes interfere with each other. Therefore, as shown, for example, in a portion surrounded by a broken line in FIG. 13, distortion of ripples occurs, leading to deterioration of the reactor performance. In order to suppress the interference of the magnetic flux, the distance between the reactors has to be separated as much as possible, and the size of the reactor has to be increased.

  By the way, the technique which accommodates two reactors in one case, and provides a central barrier as a partition between these reactors is known (refer patent document 1). However, this central barrier is to form a space for accommodating the reactor, and no consideration was given to magnetic interference.

  The present invention has been made to solve the problems as described above, and an object thereof is to provide a reactor capable of suppressing magnetic interference of an adjacent reactor.

The magnetically coupled reactor of the present invention is characterized by having the following configuration.
(1) a plurality of reactor bodies obtain Bei a plurality of coils mounted on the annular core and the annular core.
(2) The case where the accommodating part which accommodates the said reactor main body was provided in multiple parallel.
(3) The reactor main body is accommodated in the accommodation portion.
(4) A wall separating the reactor main body is provided between the reactor main bodies of the case.
(5) The wall has a height from the bottom of the housing of the case to 50% to 100% of the height from the bottom of the housing of the case to the top of the coil of the reactor body.
(6) The magnetic flux generated from the coils of the plurality of coils in the direction to cancel each other leaks out of the reactor body.

In the present invention, the following configuration may be provided.
( 7 ) The wall may be provided with a slit communicating between the accommodating portions.
( 8 ) The reactor main body is disposed adjacent to the other reactor main body on the left and right, the slit is provided in the wall between the coils of the reactor main body, and the end of the slit from the end of the coil The length of the wall up to 20 mm or more.
( 9 ) The reactor main body is disposed adjacent to the other reactor main body on the left and right, the slit is provided in the wall between the coils of the reactor main body, and the axial length of the coil; The ratio of the length from the end of the coil to the end of the slit is 30% or more.

  ADVANTAGE OF THE INVENTION According to this invention, the reactor which can suppress the magnetic interference of an adjacent reactor can be obtained.

It is a perspective view which shows the whole structure of the magnetic coupling type reactor which concerns on 1st Embodiment. It is a disassembled perspective view which shows the whole structure of the magnetic coupling type reactor which concerns on 1st Embodiment. It is a top view of the case concerning a 1st embodiment. It is a figure which shows the height of a reactor main body and a wall. It is a graph which shows the relation of the ratio of the height of the wall to the main part of a reactor, and an interference rate. (A) is an interference waveform, (b) is a figure which shows an ideal waveform. It is an upper surface schematic diagram of the magnetic coupling type reactor concerning a 2nd embodiment. It is a graph which shows the relationship between the distance from a coil end to a slit end, and an interference rate. It is a graph which shows the relationship between the ratio of the coil length and the length from a coil end to a slit, and an interference rate. (A)-(d) is a figure which shows other embodiment of the wall provided in a case. It is a figure which shows the conventional magnetic coupling type reactor. It is a schematic diagram which shows the leakage flux of the conventional magnetic coupling type reactor. It is a figure which shows the ripple which generate | occur | produces by interference of leakage magnetic flux.

  Hereinafter, a magnetic coupling type reactor according to an embodiment of the present invention will be described with reference to the drawings.

[1. First embodiment]
[1-1. Outline configuration]
The magnetically coupled reactor (hereinafter, also simply referred to as “reactor”) of the present embodiment is a large-capacity reactor used, for example, in a drive system of a hybrid vehicle, an electric vehicle, or a fuel cell vehicle. The reactor is a main component of the electric circuit mounted on these vehicles. This electric circuit has a semiconductor switching element such as an IGBT in addition to the reactor. The reactor converts electric energy supplied from an external power source into magnetic energy by turning on and off the semiconductor switching element at high speed, and repeatedly stores and releases the energy to suppress current and voltage.

  FIG. 1 is a perspective view showing the entire configuration of the magnetic coupling type reactor according to the present embodiment, and FIG. 2 is an exploded perspective view thereof. In addition, since the two reactor main bodies 10 of FIG. 1 are the same structures in all, only one is shown in FIG. 2, and the other is abbreviate | omitted.

  The magnetically coupled reactor according to the present embodiment includes a plurality of reactor bodies 10 and a case 40 for housing the plurality of reactor bodies 10. In the present embodiment, the number of reactor bodies 10 is two, but may be three or more. As shown in FIG. 1 and FIG. 2, the reactor main body 10 covers the outer periphery of the annular core 1, the coil 5 mounted on the outer periphery of a portion of the annular core 1, and the outer periphery of the annular core 1. And the resin member 2 which insulates.

  The annular core 1 is an annular magnetic body, and has a pair of parallel linear portions in a part of an annular shape and a U-shaped connecting portion connecting these linear portions. Of the annular core 1, the straight portion around which the coil 5 is wound is a leg portion where magnetic flux is generated. The leg portions of the annular core 1 of the present embodiment are a pair of linear portions wound around a pair of parallel arranged coils 51a and 51b shown in FIG. The magnetic flux is generated in the legs because a magnetic flux linking the coil 5 is generated when a current flows in the coil 5. The U-shaped connecting portion in which the coil 5 is not wound is a yoke portion through which the magnetic flux generated in the leg passes. That is, the yoke portion connects the pair of straight portions. As will be described later, in the annular core 1, the magnetic flux generated in each leg passes so as to cancel each other through the yoke part.

  The resin member 2 is a molded article in which the outer periphery of the annular core 1 is covered with a resin, and has an annular shape like the annular core 1 as a whole. The resin member 2 insulates the annular core 1 and the coil 5.

  The coil 5 has a pair of coils 51a and 51b, and the coils 51a and 51b are mounted on the outer periphery of the annular core 1 via the resin member 2 with their axial directions parallel to each other. The two coils 51a and 51b are mounted in such a direction that the direct current magnetic fluxes generated therefrom are canceled each other. In order to generate the direct current magnetic fluxes in mutually canceling directions, in the present embodiment, the winding direction and the energization direction of the coils 51a and 51b are the same, but may be reversed.

  The case 40 is a container having an open upper surface and a substantially rectangular parallelepiped shape as a whole, and includes a plurality of housing portions 41 which are spaces for housing the reactor main body 10. In the present embodiment, there are two accommodating portions 41, which are provided in parallel. In the present embodiment, the housing portions 41 are provided on the left and right. Between the accommodating portions 41, walls 42 which separate the accommodating portions 41 are provided. The wall 42 of the present embodiment is provided to traverse the inside of the case 40. When reactor body 10 is accommodated in each accommodation portion 41, reactor body 10 is disposed adjacent to the left and right, and a total of four coils 51a and 51b have their winding axes arranged parallel to each other and in a direction orthogonal to the winding axes. It becomes arrangement.

  Reactor main body 10 accommodated in accommodation portion 41 is fixed to case 40. For this fixing, fixing portions 23a, 23b, 24a, 24b are provided in the connecting portions 21c, 22d of the resin member 2, and screws are fastened to the fixing portions 23a, 23b, 24a, 24b to make the reactor body 10 Is fixed to the case 40.

  A filler is filled and solidified in the gap between the reactor main body 10 and the case 40 to form the filling portion 6. For the filler, a resin that is relatively soft and has a high thermal conductivity is suitable for securing the heat dissipation performance of the reactor body 10 and reducing the vibration propagation from the reactor body 10 to the case 40.

[1-2. Detailed configuration]
Next, each composition of reactor main part 10 of this embodiment is explained in detail.

(Annular core)
The annular core 1 is a magnetic body such as a dust core, a ferrite core, or a laminated steel plate. The annular core 1 has a plurality of core members, and the core members are connected to form an annular shape via the adhesive layer 1e. In the present embodiment, no spacer is provided between the core members, but a spacer may be interposed between the core members.

  The core members of this embodiment are I-shaped cores 1a and 1b constituting left and right leg portions and two U-shaped cores 1c and 1d constituting yoke portions. The I-shaped cores 1a and 1b and the U-shaped cores 1c and 1d have adhesive surfaces to which other core members adhere at both ends. The I-shaped cores 1a and 1b and the U-shaped cores 1c and 1d are annularly connected and fixed by an adhesive layer 1e interposed between their adhesive surfaces.

  The adhesive layer 1 e is made of an adhesive. Although it does not specifically limit as an adhesive agent, A thermosetting type adhesive agent can be used, For example, an epoxy type, silicone type, an acrylic type adhesive agent is mentioned. Epoxy adhesives are preferred because of their high strength.

(Resin member)
The resin member 2 is a member covering the outer periphery of the annular core 1 with a resin, and has an annular shape following the annular core 1 as a whole. That is, the resin member 2 has a pair of linear portions and a connecting portion connecting the pair of linear portions. A coil 5 is wound around the outer periphery of a part of the resin member 2, and the resin member 2 insulates the annular core 1 and the coil 5.

  Examples of the resin include epoxy resin, unsaturated polyester resin, urethane resin, BMC (Bulk Molding Compound), PPS (Polyphenylene Sulfide), and PBT (Polybutylene Terephthalate). These resins have strength not to be broken by pressing of the core members added at the time of assembling the annular core 1. In the present embodiment, the resin member 2 is described as a member made of resin, but the material having the insulating property is not limited to the resin, and another material may be used as long as it has the insulating property.

  The resin member 2 is divided into two. That is, the resin member 2 is configured by separately molding the substantially U-shaped first resin body 21 and the substantially C-shaped second resin body 22 and bringing the end portions into abutment with each other. Be done. The first resin body 21 and the second resin body 22 are separately molded in order to accommodate the I-shaped cores 1a and 1b inside and to fit and attach the coil 5.

  Specifically, the first resin body 21 has a pair of cylindrical linear portions 21a and 21b, and a connecting portion 21c connecting the linear portions 21a and 21b. The second resin body 22 has a pair of cylindrical linear portions 22a and 22b, and a connecting portion 22d connecting the linear portions 22a and 22b. The straight portions 21 a and 21 b of the first resin body 21 are longer than the straight portions 22 a and 22 b of the second resin body 22.

  U-shaped cores 1c and 1d are embedded in the connecting portions 21c and 22d by a molding method. In other words, the outer peripheral portions of the U-shaped cores 1c and 1d covered by the connecting portions 21c and 22d fit with the inner peripheries of the connecting portions 21c and 22d.

  I-shaped cores 1a and 1b are disposed inside the straight portions 21a, 21b, 22a and 22b. Openings are respectively provided at the tips of the straight portions 21a, 21b, 22a, 22b. When assembling the reactor main body 10, one end of the I-shaped cores 1a and 1b is inserted from the opening of the straight portions 21a and 21b, and the other end of the I-shaped cores 1a and 1b is inserted into the openings of the straight portions 22a and 22b The opening portions of the first resin body 21 and the second resin body 22 are butted to constitute the resin member 2 covering the annular core 1.

  As shown in FIG. 2, the connecting portions 21 c and 22 d are provided with fixing portions 23 a, 23 b, 24 a and 24 b for fixing the annular core 1 to the case 40. The fixing portions 23a, 23b, 24a, 24b protrude from the surfaces of the connecting portions 21c, 22d, and screw insertion holes 25a, 25b, 26a, 26b are provided at the tips thereof. Collars 28a and 28b are fitted in the screw insertion holes 26a and 26b. The reactor main body 10 is fixed to the case 40 by inserting a screw into the screw insertion holes 25 a, 25 b, 26 a, 26 b and fastening the screw in the screw hole of the case 40.

  The fixing portions 23a and 23b of the connecting portion 21c are metal fittings, and one end portion thereof is embedded in the connecting portion 21c so that the screw insertion holes 25a and 25b are exposed by a molding method together with the U-shaped core 1c. On the other hand, the fixing portions 24a and 24b of the connecting portion 22d are made of resin. In the present embodiment, the fixing portions 24 a and 24 b are formed by pouring a resin into a mold for forming the second resin body 22, and are configured seamlessly and continuously from the connecting portion 22 d.

  The connector 8 which can connect another member is provided in the surface of the connection part 21c. In the present embodiment, the temperature sensor 9 is attached. The temperature sensor 9 includes a temperature detection unit 9a and a lead wire 9b connected to the temperature detection unit 9a. The temperature detection unit 9a is disposed, for example, between the coils 51a and 51b, and detects the temperature inside the reactor main body 10. The lead wire 9b is attached to the connector 8, and transmits the temperature information detected by the temperature detection unit 9a to the outside of the reactor. As the temperature sensor 9, for example, a thermistor whose electric resistance changes with temperature change can be used, but it is not limited thereto.

(coil)
The coil 5 is a conducting wire having an insulating coating. In the present embodiment, the coil 5 is an edgewise coil of a flat wire. However, the wire material and winding method of the coil 5 are not limited to the edgewise coil of a flat wire, You may be another form. In the present embodiment, the coil 5 includes left and right coils 51a and 51b, and the coils 51a and 51b are wound around the outer periphery of the pair of straight portions 21a, 21b, 22a and 22b of the resin member 2. Accordingly, the four coils 51a and 51b are parallel to each other in the winding axis direction, and are aligned in the direction orthogonal to the winding axis direction.

  The coils 51a, 51b are respectively constituted by one enameled copper wire and wound in the same direction. One end 52a, 52b of the coil 51a and the coil 51b is drawn to the first resin body 21 side, and the other end 53a, 53b is drawn to the second resin body 22 side. End portions 52a, 52b, 53a, 53b are joined to a bus bar (not shown) and connected to an external power supply (not shown) via the bus bar. When power is supplied from this external power supply, for example, when power is supplied from the end portions 53a and 53b, the coils 51a and 51b receive the first resin body 22 from the second resin body 22 so as to cancel each other through the U-shaped core 1c. Magnetic flux is generated in the direction of the resin body 21.

  In the present embodiment, both ends 52a, 52b, 53a, 53b of the coils 51a, 51b are drawn out, but may be connected to the end of one coil 51a and the end of the other coil 51b. . In this case, the winding directions are reversed.

(Case)
Next, the case 40 will be described in detail. FIG. 3 is a top view of the case 40 of the present embodiment. FIG. 4 is a view showing the heights of the reactor main body 10 and the wall 42, and is a view of the left side of the reactor main body 10 in FIG. 1 as viewed from the side thereof. However, the cross section of the wall 42 of the case 40 and the case 40 is also shown.

  As shown in FIGS. 1 to 3, the case 40 has a bathtub shape with an opening on the top surface, and accommodates and supports the reactor main body 10. The material of the case 40 may be any material that can obtain a magnetic shielding (magnetic shielding) effect, such as aluminum, an aluminum alloy, a metal / resin composite material that is a resin containing a filler made of metal. Metals having high thermal conductivity and light weight such as aluminum alloys are preferred.

  The case 40 includes two housings 41 and a wall 42 provided between the housings 41. The housing portion 41 is a space for housing and supporting the reactor main body 10. The housing portion 41 is formed by the outer side wall, the bottom surface, and the wall 42 of the case 40, and the shape of the housing portion 41 conforms to the shape of the reactor main body 10. Screw holes 411 to 414 are provided at the four corners of the housing portion 41, and the fixing portions 23a, 23b, 24a, 24b of the reactor main body 10 are mounted at the places, and the reactor main body 10 is supported. Moreover, as shown in FIG. 4, in the state which accommodated and supported the reactor main body 10 in the accommodating part 41, there is some clearance from the bottom face of the accommodating part 41 to the bottom face of coil 51a, 51b. In the present specification, the “bottom surface of the housing portion 41” refers to the plane of the deepest portion facing the bottom surfaces of the coils 51a and 51b unless otherwise specified.

  The wall 42 is provided to cross the inside of the case 40 and separates the reactor main bodies 10 housed in the housing portion 41. That is, the wall 42 divides the housing portions 41. The wall 42 is continuous with the bottom and side of the housing portion 41 of the case 40 and is made of the same material as the case 40.

  The height of the wall 42 is 50% or more with respect to the height of the reactor body 10. In detail, as shown in FIG. 4, the height H1 of the wall 42 is the height from the bottom of the housing portion 41 of the case 40, and the height H2 of the reactor main body 10 is from the bottom of the housing portion 41 of the case 40 It is the distance to the upper surface of the coil 51a or the coil 51b. The height of the wall 42 is not particularly limited as long as it is 50% or more as described above, but is appropriately designed in consideration of the required magnetic shielding effect, the space where the reactor is installed, and the like. The height of the wall 42 can be, for example, 50% to 120%. In particular, when the height of the wall 42 is set to 50% to 100%, not only the magnetic shielding effect can be obtained, but also the overall size of the reactor can be reduced.

  FIG. 5 is a graph showing the relationship between the ratio (H1 / H2) of the height of the wall 42 to the reactor main body 10 and the interference rate. The graph in FIG. 5 is a result obtained by measuring the current as described below and calculating the interference rate, with the height from the bottom of the housing portion 41 to the top surface of the coil 51a or 51b being 47.22 mm.

  That is, the voltage of the same value was periodically applied to a total of four coils 51a and 51b with respect to the ratio of the height of each wall 42, and the current flowing in the coils 51a and 51b was measured. When the current waveform at this time is referred to as an interference waveform, the interference waveform is, for example, as shown in FIG. The average current value is, for example, 100 A or more. The interference rate is {(interference waveform / ideal waveform) -1 from this interference waveform and an ideal waveform obtained by linearly approximating each section between the peak and the bottom of the interference waveform shown in FIG. 6 (b). Calculated based on the equation of}. Specifically, the interference rate indicates the maximum deviation rate of the interference waveform from the ideal waveform at the same time, and the “interference waveform” and the “ideal waveform” in the above equation each have a maximum deviation time. The current value of was substituted.

  As shown in FIG. 5, the curve of the interference ratio to the ratio of heights tends to decrease as the ratio of heights increases. The curve also has an inflection point at a height ratio of 50%. That is, the degree of decrease in the interference rate changes when the ratio of heights reaches 50%. If the height ratio is less than 50%, the interference rate increases by more than about 0.5%, and the magnetic shielding effect of the wall 42 is low. On the other hand, when the ratio of the height is 50% or more, the interference rate decreases, and it can be seen that the magnetic shielding effect of the wall 42 is high.

[1-3. Action effect]
(1) The magnetically coupled reactor according to the present embodiment includes the annular core 1 and the plurality of coils 51a and 51b attached to the annular core 1, and the plurality of coils 51a and 51b generate magnetic fluxes in directions in which the magnetic fluxes cancel each other. The reactor main body 10 is provided with a case 40 in which a plurality of housing portions 41 for housing the reactor main body 10 are provided in parallel, and the reactor main body 10 is housed in the housing portion 41. , The wall 42 which separates the reactor main body 10 was provided. The wall 42 has a height H1 from the bottom of the housing portion 41 of the case 40 to 50% or more of the height H2 from the bottom of the housing portion 41 of the case 40 to the top surface of the coil 51a or 51b of the reactor body 10. It was made to become.

  Thereby, the magnetic interference to the adjacent reactor main body 10 can be suppressed. That is, if reactor body 10 is disposed adjacent to one another, the end of coil 51 b of one of the reactor bodies 10 is adjacent to the end of coil 51 a of the other reactor body 10. Since the leakage flux is generated from the ends of the coils 51a and 51b, interference of the leakage flux with each other occurs. In the present embodiment, by providing the wall 42 of about half or more of the height of the reactor body 10 between the reactor bodies 10, the influence of most of the leakage flux can be suppressed.

  From this, according to the present embodiment, the arrangement space of the reactor is restricted, and even when the reactor bodies 10 are arranged side by side, the influence of the leakage flux can be reduced, so that the overall size can be reduced. For example, since it is not necessary to provide a case for each reactor body 10 and a plurality of reactor bodies 10 can be installed with one case 40, it is possible to miniaturize and reduce the number of parts.

[2. Second embodiment]
[2-1. Constitution]
A second embodiment will be described using FIGS. 7 to 9. The second embodiment has the same basic configuration as the first embodiment. Therefore, only differences from the first embodiment will be described, and the same parts as those of the first embodiment are denoted by the same reference numerals and detailed description thereof will be omitted.

  FIG. 7 is a schematic top view of the magnetically coupled reactor according to the second embodiment. The second embodiment differs in the structure of the wall of the case 40. That is, the wall 43 of the second embodiment is provided with a slit 44 communicating between the accommodating portions 41 at the central portion thereof. In other words, the central portion of the wall 43 is cut away to form a slit 44, and the slits 44 communicate the housing portions 41 with each other. The slits 44 are provided in the wall 43 between the coils 51 b and 51 a of the two reactor bodies 10. Although the slit 44 in the present embodiment is cut out to the same height as the bottom surface of the housing portion 41, the present invention is not limited to this. In addition, although the wall 43 is comprised by the wall of one end side and the other end side of a coil, and two sheets, the height H1 is the same.

  Furthermore, in the present embodiment, as shown in FIG. 7, the distance from the end (hereinafter also referred to as “coil end”) CE of the coil 51 a or 51 b to the end SE of the slit 44 is 20 mm or more. The coil end CE means the end of the wound portion of the coils 51a and 51b. The slit 44 end SE means the one closest to the coil end CE.

  FIG. 8 is a graph showing the relationship between the distance from the coil end CE to the slit 44 end SE and the interference rate. In the figure, when the height ratio (H1 / H2) of the wall 43 is 50%, 100% and 120%, the interference ratio when the distance from the coil end CE to the slit 44 end SE is changed The results are shown. As shown in FIG. 7, the distance from the coil end CE to the slit 44 end SE is such that the direction of the slit 44 end SE is a positive direction (+ direction) with respect to the coil end CE, and the opposite direction is a negative direction (- Direction). The interference rate is the same as the calculation method of the first embodiment.

  As shown in FIG. 8, it can be seen that the interference ratio tends to decrease as the distance from the coil end CE to the slit 44 end SE becomes longer regardless of the height ratio of the wall 43 in any case. Also, it can be seen that the interference ratio decreases as the height ratio of the wall 43 increases.

  In detail, when the height ratio of the wall 43 is 50% and 120%, it can be seen that the reduction rate of the interference rate decreases when the distance from the coil end CE to the slit 44 end SE is 20 mm. That is, it is understood that magnetic interference can be efficiently suppressed if the distance is 20 mm or more. From this result, it is understood that the leakage magnetic flux from the vicinity of the coil end CE affects the magnetic interference, and the magnetic shielding effect is thin even if it is made longer than necessary. Further, in the case where the height ratio of the wall 43 is 100%, the same can be said with the distance from the coil end CE to the slit 44 end SE being 15 mm. From the above, if the distance from the coil end CE to the slit 44 end SE is at least 20 mm or more, magnetic interference can be efficiently suppressed.

  Furthermore, in the case where the height ratio of the wall 43 is 100% and 120%, the interference rate is 0.3% or less, and the magnetic shielding effect is remarkable as compared with 0.5% at 50%.

[2-2. Action effect]
In the present embodiment, by providing the slits 44 in the wall between the reactor bodies 10, it is possible to improve the filling work efficiency of the filler to the gap between the case 40 and the reactor bodies 10. That is, if the slits 44 were not provided in the wall between the reactor main bodies 10, it was necessary to divide the filling work into the respective accommodating portions 41, but the slits 44 are provided. Since the filled filler material advances into the other accommodation part 41 through the slit 44, it is not necessary to divide the filling operation.

  Further, the slits 44 are provided in the wall 43 between the coils 51 b and 51 a of the reactor main body 10, and the length of the wall 43 from the coil end CE to the slit end SE is 20 mm or more. Thereby, it is possible to efficiently shield the leakage flux from the vicinity of the coil end CE, and it is possible to properly suppress the magnetic interference. Furthermore, since the width of the slits 44 in the axial direction of the coils 51a and 51b can be increased, the filler easily advances into the other accommodation portion 41, and the filling operation efficiency is improved.

[3. Third embodiment]
The third embodiment will be described with reference to FIG. The third embodiment is the same as the second embodiment in basic configuration. Therefore, only differences from the second embodiment will be described, and the same parts as those of the second embodiment will be assigned the same reference numerals and detailed explanations thereof will be omitted.

  In the third embodiment, the ratio of the axial length of the coils 51a and 51b (hereinafter also referred to as "coil length") and the length from the coil end CE to the slit 44 end SE is 30% or more. . In addition, the length of the axial direction of a coil means the length between the coil end CE in the same coil. In the present embodiment, the axial length of the coil is 67.12 mm, but it is not limited to this.

  FIG. 9 is a graph showing the relationship between the ratio of the coil length and the length from the coil end CE to the slit 44 and the interference rate. In the figure, when the height ratio (H1 / H2) of the wall 43 is 50%, 100%, and 120%, the ratio of the coil length and the length from the coil end CE to the slit 44 is changed The interference rate results are shown. The distance from the coil end CE to the slit end SE is such that the direction of the slit 44 end SE is positive with reference to the coil end CE. The interference rate is the same as the calculation method of the first embodiment.

  As shown in FIG. 9, the interference ratio tends to decrease as the ratio of the coil length and the length from the coil end CE to the slit 44 end SE increases, regardless of the height ratio of the wall 43 in any case. I understand. Also, it can be seen that the interference ratio decreases as the height ratio of the wall 43 increases.

  Specifically, when the height ratio of the wall 43 is 50% and 120%, the reduction rate of the interference rate decreases when the ratio of the coil length and the length from the coil end CE to the slit 44 end SE is 30%. I understand that That is, it is understood that magnetic interference can be efficiently suppressed if the ratio is 30% or more. From this result, it is understood that the leakage magnetic flux near the coil end CE affects the magnetic interference, and the magnetic shielding effect is thin even if the ratio is increased more than necessary. Further, in the case where the height ratio of the wall 43 is 100%, the same can be said with the ratio of the coil length and the length from the coil end CE to the slit 44 end SE being about 22%. From the above, if the ratio of the coil length and the length from the coil end CE to the slit 44 end SE is at least 30% or more, magnetic interference can be efficiently suppressed.

  Furthermore, in the case where the height ratio of the wall 43 is 100% and 120%, the interference rate is 0.3% or less, and the magnetic shielding effect is remarkable as compared with 0.5% at 50%.

  As described above, in the present embodiment, the ratio of the coil length and the length from the coil end CE to the slit 44 end SE is 30% or more. Thereby, it is possible to efficiently shield the leakage flux from the vicinity of the coil end CE, and it is possible to properly suppress the magnetic interference. Furthermore, since the width of the slits 44 in the axial direction of the coils 51a and 51b can be increased, the filler easily advances into the other accommodation portion 41, and the filling operation efficiency is improved.

[4. Other embodiments]
The present invention is not limited to the first to third embodiments, and includes the other embodiments described below. Furthermore, the present invention also encompasses a combination of at least any two of the first to third embodiments and the other embodiments described below.

(1) In the first to third embodiments, the walls 42 and 43 are made of the same material as the main body constituting the housing portion 41 of the case 40, but even if a material having a higher magnetic shielding effect than that main body is used good.

(2) In the first to third embodiments, the walls 42 and 43 are formed to be continuous with the bottom and the side of the case 40, but the walls 42 and 43 are separately formed, and the housing portion 41 is formed. It may be provided between them.

(3) In the first to third embodiments, the walls 42 and 43 have the same height in the axial direction of the coil, but even if the height near the coil end is higher than other locations good. In addition, the walls 42 and 43 may have any shape as well as the height, the arrangement location of the slits 44, the number, the depth, the shape, and the like. For example, a wall 45 as shown in FIGS. 10 (a) to 10 (d) may be used. The depth of the slits 44 may be reduced as shown in FIG. 10A, or a plurality of slits 44 may be provided as shown in FIG. 10B. Further, as shown in FIG. 10 (c), the shape of the slit 44 may be a triangle, or may be a round shape as shown in FIG. 10 (d). It should be noted that changing the arrangement location, number, depth and shape of the slits 44 can also change the view as changing the shape or height of the walls 42 and 43.

(4) In the first to third embodiments, the U-shaped core and the I-shaped core are used as core members in order to form the annular core 1, but the present invention is not limited to this. In addition to these, as the core member, a core having a shape capable of forming an E-shaped core, a T-shaped core, a C-shaped core, a J-shaped core or other annular cores 1 can be used. Moreover, the annular core 1 may not necessarily be configured by a divided core member, and may be a single annular core.

(5) In the first to third embodiments, the reactor bodies 10 are arranged in the left-right direction as shown in FIG. 1 as being arranged in parallel, but may be arranged in parallel in the front-rear direction. For example, in the case of two reactor bodies 10, the coils 51a of both reactor bodies 10 are arranged on the same straight line so that the winding axes are common, and the coils 51b are also identical so that the winding axes of the coil 51b are common. Arrange on the line. Also, the plurality of reactor bodies 10 may be arranged in parallel in the vertical direction in addition to the left-right direction or the front-rear direction.

(6) In the first to third embodiments, the walls 42 and 43 are provided longitudinally in the case 40 so as to extend in parallel with the winding axis direction of the coils 51a and 51b, but the invention is limited thereto Alternatively, they may be provided obliquely with respect to the winding axis direction of the coils 51a and 51b.

(7) In the first to third embodiments, the walls 42 and 43 are vertically provided from the bottom of the case 40 as shown in FIG. 2, but the present invention is not limited thereto. It may be provided to be inclined toward 10.

DESCRIPTION OF SYMBOLS 1 cyclic core 1a, 1b I-shaped core 1c, 1d U-shaped core 1e adhesive layer 10 reactor body 2 resin member 21 first resin body 21a, 21b straight portion 21c connecting portion 23a, 23b fixing portion 25a, 25b screw insertion Hole 22 second resin body 22a, 22b straight portion 22d connecting portion 24a, 24b fixing portion 26a, 26b screw insertion hole 28a, 28b collar 40 case 41 housing portion 411 to 414 screw hole 42, 43 wall 44 slit 45 wall 5 coil 51a, 51b Coil 52a, 52b End 53a, 53b End 6 Filled part 8 Connector 9 Temperature sensor 9a Temperature detection part 9b Lead wire CE Coil end SE Slit end H1 Case height of wall H2 from bottom of case Height of reactor main body (distance from bottom of housing of case to top of coil)

Claims (4)

A plurality of reactor bodies obtain Bei a plurality of coils mounted in the annular core and the annular core,
A case in which a plurality of accommodating portions for accommodating the reactor main body are provided in parallel;
Equipped with
The reactor body is housed in the housing portion,
Between the reactor bodies of the case, there is provided a wall separating the reactor bodies,
Said wall has a height from the housing section bottom surface of the case, Ri the Der 100% to 50% relative to the height of the coil upper face of the reactor body from the accommodating portion bottom surface of the case,
The magnetic flux generated from the respective coils of the plurality of coils in a direction to cancel each other leaks out of the reactor main body,
Magnetically coupled reactor characterized by The wall is provided with a slit for communicating between the housing portions,
The magnetically coupled reactor according to claim 1, characterized in that The reactor main body is disposed adjacent to the other reactor main body on the left and right,
The slit is provided in the wall between the coils of the reactor body,
The length of the wall from the end of the coil to the end of the slit is at least 20 mm,
Magnetically coupled reactor according to claim 2, characterized in that The reactor main body is disposed adjacent to the other reactor main body on the left and right,
The slit is provided in the wall between the coils of the reactor body,
The ratio of the axial length of the coil to the length of the slit from the end of the coil is 30% or more.
Magnetically coupled reactor according to claim 2 or 3, characterized in that

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