JP2023097799A - Reactor - Google Patents

Abstract

To provide a high-quality reactor by allowing easy installation of an auxiliary winding.SOLUTION: A reactor comprises a main coil 2, a core 3, core coating resin 5, an auxiliary winding 4, and an auxiliary winding support 6. The main coil 2 receives a current flowing from the outside. The core 3 contains a magnetic material, and the main coil 2 is fitted thereto. The core coating resin 5 coats the core 3, and is interposed between the core 3 and the main coil 2. The auxiliary winding 4 generates a current when it receives a magnetic flux of the main coil 2. The auxiliary winding support 6 supports the auxiliary winding 4, and is installed on the core coating resin 5 such that the auxiliary winding 4 may be fitted to the core 3. The auxiliary winding support is provided separately from the core coating resin 5.SELECTED DRAWING: Figure 7

Description

The present invention relates to reactors.

A reactor mainly consists of a coil and a core. When energized, the coil generates magnetic flux according to the number of turns. Hereinafter, a coil that functions as an inductive reactance by being energized from the outside to generate a magnetic flux will be referred to as a main coil. The core forms a closed magnetic circuit through which the magnetic flux generated by the coil passes according to a magnetic permeability higher than that of a vacuum. In other words, a reactor is an electromagnetic component that converts electrical energy into magnetic energy for storage and release.

Such reactors are used in a wide variety of applications. Typical reactors include step-up reactors, series reactors, parallel reactors, current limiting reactors, starting reactors, shunt reactors, neutral point reactors and arc extinguishing reactors.

A boost reactor is incorporated in a vehicle booster circuit such as a drive system for a hybrid vehicle or an electric vehicle. A series reactor is connected in series with the motor circuit to limit the current during a short circuit. A parallel reactor stabilizes current sharing between parallel circuits. A current limiting reactor is connected to limit the current during a short circuit. The starting reactor is connected in series with the motor circuit protecting the machine to limit the starting current. The shunt reactor is connected in parallel to the transmission line to compensate for phase-advancing reactive power and suppress abnormal voltage. The neutral point reactor is connected between the neutral point and the ground and used to limit the ground fault current that flows in the event of a ground fault in the power system. The arc extinguishing reactor automatically extinguishes an arc that occurs when a single-line ground fault occurs in a three-phase power system.

In such a reactor, an auxiliary winding may be provided in order to detect the state of the reactor. The auxiliary winding receives the magnetic flux generated by the main coil and supplies a current corresponding to the magnetic flux. By detecting the current value of the auxiliary winding, it can be used as a sensor for measuring the magnetic flux generated by the reactor, for example.

Japanese Patent No. 5267802

2. Description of the Related Art In recent years, miniaturization of reactors has been demanded due to progress of miniaturization of circuits and integration of electric parts. A reactor is formed by attaching a coil to a core. In order to form a closed magnetic circuit, the core has a leg to which the coil is mounted, another leg parallel to this leg, and a yoke that defines a closed ring shape by sandwiching each leg from both sides. The space between the legs is narrowed for the miniaturization of the reactor. Furthermore, the core is covered with a resin having insulating properties for insulation from the coil. Therefore, the space between the resin-coated legs is further narrowed.

The task of inserting the auxiliary winding into such a narrow area, winding it around the leg, and pulling it out has become more difficult as reactors have become smaller, and there is a risk that the auxiliary winding cannot be properly installed without bending. obtain.

The present invention has been proposed to solve the above problems, and an object of the present invention is to provide a high-quality reactor in which an auxiliary winding can be easily installed.

In order to achieve the above object, a reactor according to an embodiment of the present invention includes a main coil to which current flows from the outside, a magnetic body, a core to which the main coil is attached, a core that covers the core, and the A core coating resin interposed between the core and the main coil, an auxiliary winding into which the magnetic flux of the main coil enters to generate a current, and a support for the auxiliary winding so that the auxiliary winding is attached to the core. an auxiliary winding support separate from the core coating resin and matingly mounted on the core coating resin.

The core has a closed ring shape including a plurality of legs and a yoke portion connecting the legs, the core covering resin has a yoke housing portion covering the yoke portion, and the auxiliary winding is , may be sandwiched between the yoke receiving portion and the auxiliary winding support.

The auxiliary winding support has annular inner and outer frames and a groove between the inner and outer frames, and the auxiliary winding is wired in the groove. good too.

The outer frame of the auxiliary winding support may have corners spaced apart from the auxiliary winding.

The auxiliary winding has a lead wire drawn out from the auxiliary winding support and a curved region opposite to the lead wire by 180 degrees, and the outer frame of the auxiliary winding support A wall portion that faces the curved region of the auxiliary winding and regulates the position of the curved region may be provided.

According to the present invention, since the auxiliary winding can be easily installed, the quality of the reactor is improved.

It is a perspective view showing the main composition of a reactor. FIG. 4 is a perspective view of a core; It is a perspective view which shows the whole structure of a reactor. 1 is an exploded view of a core coating resin; FIG. Fig. 3 is a perspective view of an auxiliary winding support; FIG. 4 is a perspective view showing a state in which auxiliary windings are set on an auxiliary winding support; FIG. 3 is an exploded perspective view of an auxiliary winding support, core covering resin, and a main coil on which auxiliary windings are wired; FIG. 4 is a perspective view after assembling the auxiliary winding support and the core coating resin;

A reactor according to an embodiment of the present invention will be described below with reference to the drawings. In each drawing, the thickness, size, positional relationship, ratio, shape, etc. may be emphasized for easy understanding, and the present invention is not limited to such emphasis.

FIG. 1 is a perspective view showing the main configuration of the reactor of this embodiment. The reactor 1 is an electromagnetic component that converts electrical energy into magnetic energy for storage and release. A reactor 1 includes a main coil 2 , a core 3 and an auxiliary winding 4 . A main coil 2 and an auxiliary winding 4 are fitted on the core 3 . For example, reactor 1 has three main coils 2 and three auxiliary windings 4 for one core 3 .

The main coil 2 is an inductor that generates magnetic flux when a current flows from the circuit in which the reactor 1 is incorporated, and introduces inductive reactance into the circuit. The main coil 2 is a cylindrically wound body of a conductive wire coated with an insulating coating such as enamel coating, and is spirally wound along the winding axis while shifting the winding position for each turn. formed by The main coil 2 is, for example, a rectangular wire, and is a helical edgewise coil formed by winding the conductive wire so that the wide surface of the conductive wire spreads in the direction perpendicular to the winding axis of the main coil 2 . As the main coil 2, for example, a flatwise coil can also be adopted.

A lead wire 21 is drawn out from the winding start and winding end of the main coil 2 . The lead wire 21 is connected to a busbar (not shown). A bus bar is a connection conductor for connecting to other devices in a circuit, and is a long plate from which a conductor such as copper is pulled out. Each lead wire 21 is connected to each bus bar by welding or the like. A current is supplied to the main coil 2 from the outside by connecting a terminal of another device in the circuit to this bus bar.

In order to detect the state of the reactor 1, the auxiliary winding 4 receives the magnetic flux generated by the main coil 2 and passing through the core 3, generates an electromotive force corresponding to the magnetic flux, and is connected to the auxiliary winding 4. Current is applied to an external device such as a magnetic force sensor. The auxiliary winding 4 is a wound body in which a conductive wire is wound by one or more turns over approximately 360 degrees, and the lead wires 41 at the winding start and the winding end are drawn out side by side. The auxiliary winding 4 is, for example, a round wire coated with an insulating coating such as enamel coating. The auxiliary windings 4 are arranged in one-to-one correspondence with the main coils 2, and are arranged near the magnetic flux lead-out end surfaces of the corresponding main coils 2 in order to obtain magnetic flux that is less affected by magnetic flux leakage. .

The core 3 contains a magnetic material and forms a closed magnetic circuit through which the magnetic flux generated by the main coil 2 passes according to a magnetic permeability higher than that of a vacuum. Examples of the magnetic material include powder magnetic cores, ferrite magnetic cores, metal composite cores, laminated steel plates, and the like. A powder magnetic core is obtained by annealing a powder compact formed by compacting magnetic powder. The magnetic powder is mainly composed of iron, and includes pure iron powder, iron-based permalloy (Fe--Ni alloy), Si-containing iron alloy (Fe--Si alloy), sendust alloy (Fe--Si--Al alloy), Amorphous alloys, nanocrystalline alloy powders, mixed powders of two or more of these powders, and the like are included. A metal composite core is a core formed by kneading and molding magnetic powder and resin.

FIG. 2 is a perspective view of the core 3, omitting part of the main coil 2 for convenience of explanation. The core 3 is a longitudinal grid-like closed magnetic path including a yoke portion 31 , fitting leg portions 32 and connection leg portions 33 . The yoke portion 31 extends orthogonally to the winding axes of the main coil 2 and the auxiliary winding 4 and has a length that covers the entire main coil 2 . The core 3 has a pair of yoke portions 31 . The pair of yoke portions 31 sandwiches the entire main coil 2 from both end surfaces perpendicular to the winding axis of the main coil 2 .

The main coil 2 and the auxiliary winding 4 are fitted into the fitting leg portion 32 . The fitting leg portions 32 extend between the yoke portions 31 at intervals corresponding to the number of sets of the main coil 2 and the auxiliary winding 4 . The fitting leg portion 32 is a leg portion in which the inside of the main coil 2 is an air core, and is composed of a projection portion 32a and a discontinuous region 32b. The projecting portion 32a extends from each yoke portion 31 and is made of the same kind of magnetic material integrally molded with the yoke portion 31. The auxiliary winding 4 is hooked thereon, and the projecting portion 32a extends near the entrance of the annular surface of the main coil 2. ing. A discontinuous region 32b is provided between the pair of protrusions 32a, and in other words, the fitting leg 32 is discontinued between the protrusions 32a. The connecting leg portion 33 extends to both sides of the fitting leg portion 32 and connects the pair of yoke portions 31 .

Note that the fitting leg portion 32 is not limited to this, and may extend continuously between the yoke portions 31 without discontinuity. Further, the fitting leg portion 32 may have a magnetic gap that bridges between the yoke portions 31 and prevents a decrease in inductance. As the magnetic gap, non-magnetic material, ceramic, non-metal, resin, carbon fiber, or a synthetic material of two or more of these, gap paper, or air gap can be used.

FIG. 3 is a perspective view showing the overall configuration of the reactor 1. FIG. The core 3 is covered with a core coating resin 5 , and the main coil 2 and the auxiliary winding 4 are attached to the core 3 over the core coating resin 5 . The auxiliary winding 4 is attached to the core 3 by fixing it to an auxiliary winding support 6 which is separate from the core coating resin 5 and then attaching the auxiliary winding support 6 to the core coating resin 5 . An auxiliary winding stopper 55 extends from the core covering resin 5, and the lead wire 41 drawn out from the attached auxiliary winding 4 is locked so as not to come off. The auxiliary winding stopper 55 extends like a hook, and is fitted with the coating layer of the auxiliary winding 4 with its diameter reduced.

The core coating resin 5 protects the core 3 from mechanical impact and covers at least the portions where the main coil 2 and the auxiliary winding 4 are close to the core 3 to The core 3 is insulated. Auxiliary winding supports 6 facilitate mounting of the auxiliary windings 4 . Materials for the core coating resin 5 and the auxiliary winding support 6 include, for example, epoxy resin, unsaturated polyester resin, urethane resin, BMC (Bulk Molding Compound), PPS (Polyphenylene Sulfide), PBT (Polybutylene Terephthalate), or these. and the core coating resin 5 has insulating properties and heat resistance. A thermally conductive filler may be mixed in the core coating resin 5 and the auxiliary winding support 6 .

In addition, the reactor 1 is provided with a terminal block (not shown) for fixing the busbar and connecting the terminal of the external device and the busbar. The reactor 1 also includes a case (not shown) that houses a reactor body composed of a core 3 covered with a core coating resin 5, a main coil 2 fitted in the core 3, and an auxiliary winding 4. The case is made of a metal having high thermal conductivity and light weight, such as an aluminum alloy, and has heat dissipation properties. This case has a general box shape with an open top and a bottom.

The gap between the reactor body and the case may be filled with a filler and solidified. For the filler, relatively soft and highly thermally conductive resin is suitable for securing the heat radiation performance of the main coil 2 and core 3 and for reducing vibration propagation from the main coil 2 and core 3 to the case. Moreover, it is preferable that the filler has an insulating property. Examples of fillers include silicone resins, urethane resins, epoxy resins, and acrylic resins.

FIG. 4 is an exploded view of the core coating resin 5. As shown in FIG. As shown in FIG. 4 , the core coating resin 5 is divided into a short leg resin portion 51 and a long leg resin portion 56 . The short leg resin portion 51 includes a yoke housing portion 52 that covers the yoke portion 31 . A main coil insertion portion 53 that covers the fitting leg portion 32 and in which the main coil 2 is fitted extends from the yoke housing portion 52 . Furthermore, a connection leg accommodation portion 54 that covers the connection leg portion 33 extends from the yoke accommodation portion 52 .

The long leg resin portion 56 also includes a yoke housing portion 57 that covers the yoke portion 31 . A main coil insertion portion 58 that covers the fitting leg portion 32 and in which the main coil 2 is fitted extends from the yoke housing portion 57 . Furthermore, a connection leg accommodation portion 59 that covers the connection leg portion 33 extends from the yoke accommodation portion 57 . In the short leg resin portion 51 and the long leg resin portion 56 , the main coil insertion portion 53 and the connection leg accommodation portion 54 of the short leg resin portion 51 correspond to the main coil insertion portion 58 and the connection leg accommodation portion 59 of the long leg resin portion 56 . shorter.

In the short leg resin portion 51 , the main coil insertion portions 53 and the connection leg accommodation portions 54 are alternately arranged along the extending direction of the yoke accommodation portion 52 . In the long leg resin portion 56 , the main coil insertion portions 58 and the connection leg accommodation portions 59 are alternately arranged along the extending direction of the yoke accommodation portion 57 . The short leg resin portion 51 covers one yoke portion 31 from which the projecting portion 32a projects with the yoke housing portion 52 and the main coil insertion portion 53 . The long-leg resin portion 56 covers the other yoke portion 31 from which the projecting portion 32a protrudes with the yoke housing portion 57 and the main coil insertion portion 58 . Further, the long leg resin portion 56 covers the connecting leg portion 33 with the connecting leg accommodating portion 59 . The connection leg portion 33 is exposed from the tip of the connection leg accommodation portion 59 of the long leg resin portion 56 by the same length as the connection leg accommodation portion 54 of the short leg resin portion 51 .

Then, the main coil 2 is attached to the main coil insertion portion 58 of the long leg resin portion 56 . Next, the main coil insertion portion 53 and the main coil insertion portion 58 are butted against each other, and while the connection leg portion 33 exposed from the connection leg accommodation portion 59 is inserted into the connection leg accommodation portion 54, the connection leg accommodation portion 54 and the connection leg accommodation portion are separated from each other. By abutting 59, the core 3 is assembled into a closed ring. Here, the auxiliary winding 4 passes between the main coil insertion portion 53 of the short leg resin portion 51 and one of the adjacent connecting leg housing portions 54, goes around the main coil insertion portion 53, and is connected to the main coil. It can be quickly installed with high quality without bending so that it can be pulled out from the insertion portion 53 and the adjacent connection leg accommodation portion 54 on the other side. The work of mounting the auxiliary winding 4 is simplified by the work using the auxiliary winding support 6 .

5 is a perspective view of the auxiliary winding support 6. FIG. As shown in FIG. 5, the reactor 1 is provided with an auxiliary winding support 6 in order to quickly install the auxiliary winding 4 with high quality without bending. The auxiliary winding support 6 is a resin plate separate from the core covering resin 5, accommodates the auxiliary winding 4, and is attached to the core covering resin 5 by fitting.

The auxiliary winding support 6 has a flat portion 63 , an inner frame 61 , an outer frame 62 and a canopy portion 68 . The plane portion 63 is a ring-shaped flat plate, and the inside is open. The inner frame 61 rises endlessly along the inner edge of the flat portion 63 and extends vertically with the flat portion 63 as a reference. The height of the inner frame 61 from the plane portion 63 is at least equal to or greater than the wire diameter of the auxiliary winding 4 . The inner frame 61 has a generally chamfered rectangular shape, and a fitting claw 67 is formed on a part of the wall surface. The fitting claw 67 is a claw that fits into the core coating resin 5 and is elastically deformable and is disconnected from the other wall surface of the inner frame 61 .

The outer frame 62 rises vertically along the outer edge of the flat portion 63 with the flat portion 63 as a reference, and extends in the same direction as the inner frame 61 . The height of the outer frame 62 from the plane portion 63 is at least equal to or greater than the wire diameter of the auxiliary winding 4 . The outer frame 62 rises so as to surround the outer edge of the flat portion 63 in three directions and has a substantially U shape. That is, the outer frame 62 has side walls 621 facing each other and parallel to each other, and linear U-bottom side walls 622 extending between the side walls 621 at the ends of the side walls 621 and perpendicular to the side walls 621 . A chamfered curved corner portion 623 connects between the side wall portion 621 and the U-shaped bottom side wall portion 622 .

A flat portion 63 , an inner frame 61 and an outer frame 62 define a groove portion 64 in the auxiliary winding support 6 . The groove portion 64 has a U-shaped cross section, is bottomed with the flat portion 63 as the bottom, and has an exposed surface 65 at one end so that the auxiliary winding 4 can be inserted therein. A coil stop 66 for preventing the inserted auxiliary winding 4 from coming off projects from the top of the outer frame 62 with the flat portion 63 as the base end. The coil stop 66 extends, for example, from three sides of the two side wall portions 621 and the U-shaped bottom side wall portion 622 above the groove portion 64 , projects toward the inner frame 61 , and extends parallel to the plane portion 63 . Due to the temporary diameter reduction of the auxiliary winding 4 , the coil stopper 66 protrudes to such an extent that the auxiliary winding 4 can be inserted between the coil stopper 66 and the inner frame 61 .

The eaves portion 68 is a plate surface that crosses the open end of the outer frame 62 that extends in a U shape along the plane portion 63 . The eaves portion 68 rises from the remaining outer edge of the plane portion 63 other than the portion where the outer frame 62 extends. The eaves portion 68 rises higher than the inner frame 61 and the outer frame 62 , extends longer than the U-shaped bottom side wall portion 622 of the outer frame 62 , and protrudes outward beyond both side wall portions 621 of the outer frame 62 . Between the inner frame 61 and the eaves portion 68, a space equal to or larger than the conductor diameter of the auxiliary winding 4 is provided so that the auxiliary winding 4 can be wired.

FIG. 6 is a perspective view showing a state in which the auxiliary winding 4 is set on the auxiliary winding support 6. As shown in FIG. As shown in FIG. 6, the auxiliary winding 4 is pushed into the groove 64 from the exposed surface 65 of the auxiliary winding support 6 beyond the coil stop 66 . Then, starting from the eaves portion 68 side, the auxiliary winding 4 is wound along the inner frame 61 for one round so as to tighten the inner frame 61 , thereby forming an annular curved region 42 in the auxiliary winding 4 . produce. At this time, since the inside and outside of the outer frame 62 are separated by the curved corner portion 623, the curved region 42 of the auxiliary winding 4 deviates from the corner of the outer frame 62 to the outside of the outer frame 62, and the U-shaped bottom side wall is mistakenly bent. The curved region 42 of the auxiliary winding 4 passes through the portion 622 and the outer surface side, and the expansion of the winding radius of the auxiliary winding 4 is suppressed.

The lead wire 41 is pulled out from the eaves portion 68 side. On the opposite side of the lead wire 41 by 180 degrees, the curved region 42 of the auxiliary winding 4 tries to bulge toward the outer frame 62 , but the U-shaped bottom wall portion 622 prevents the bulging of the curved region 42 . Therefore, the auxiliary winding 4 is wound with a specified radius and prevented from expanding in the radial direction.

FIG. 7 is an exploded perspective view of the auxiliary winding support 6 to which the auxiliary winding 4 is wired, the core covering resin 5, and the main coil 2. As shown in FIG. As shown in FIG. 7 , the auxiliary winding support 6 is mounted on the main coil insertion portion 53 with the exposed surface 65 where the auxiliary winding 4 is exposed facing the yoke accommodating portion 52 of the short leg resin portion 51 . . The main coil 2 is also attached to the main coil insertion portion 53 of the short leg resin portion 51 and the main coil insertion portion 58 of the long leg resin portion 56 . Then, the main coil insertion portion 53 of the short leg resin portion 51 and the main coil insertion portion 58 of the long leg resin portion 56 face each other, and the connection leg housing portion 54 of the short leg resin portion 51 and the long leg resin portion 56 are connected. The core 3 is assembled into a closed ring so as to face the leg accommodating portion 59. - 特許庁

FIG. 8 is a perspective view after assembling the auxiliary winding support 6 and the core covering resin 5. As shown in FIG. As shown in FIG. 8, the auxiliary winding 4 is sandwiched between the yoke accommodating portion 52 of the core covering resin 5 and the auxiliary winding support 6, and leads to the auxiliary winding stop 55 formed in the core covering resin 5. A wire 41 is clamped. The slackness of the auxiliary winding 4 is suppressed by being sandwiched between the yoke accommodating portion 52 and the auxiliary winding support 6 . In addition, the restriction by the U-shaped bottom side wall portion 622 of the auxiliary winding support 6 prevents the auxiliary winding 4 from expanding beyond the U-shaped bottom side wall portion 622 , so that the auxiliary winding 4 expands in the direction orthogonal to the axis of the auxiliary winding 4 . The reactor 1 is prevented from becoming bulky.

Since the auxiliary winding 4 is located closer to the yoke accommodating portion 52 of the core covering resin 5 than the main coil 2 is, the bus bar extends over the auxiliary winding 4 and is pulled out to the outside of the reactor 1 . However, the auxiliary winding 4 is housed in the auxiliary winding support 6, and the eaves 68 of the auxiliary winding support 6 are hung over the auxiliary winding 4. As shown in FIG. Therefore, the auxiliary winding 4 and the busbar are separated by the eaves 68, and the insulation between the auxiliary winding 4 and the busbar is ensured.

As described above, the reactor 1 of the present embodiment includes the main coil 2, the core 3, the core coating resin 5, the auxiliary winding 4, and the auxiliary winding support 6. As shown in FIG. A current flows through the main coil 2 from the outside. The core 3 contains a magnetic material, and the main coil 2 is mounted thereon. A core covering resin 5 covers the core 3 and is interposed between the core 3 and the main coil 2 . The auxiliary winding 4 receives the magnetic flux of the main coil 2 and generates current. The auxiliary winding support 6 supports the auxiliary winding 4 and is installed on the core coating resin 5 so that the auxiliary winding 4 fits on the core 3 , and is separate from the core coating resin 5 .

As a result, there is no need to accurately push or pull out the auxiliary winding 4 into a narrow space with respect to the core coating resin 5, which has a complicated structure. In this reactor 1, the auxiliary winding 4 is installed on the auxiliary winding support 6 which is separate from the core coating resin 5 and has a simple structure, and the auxiliary winding support 6 is attached to the core coating resin 5 by simple work. , installation of the auxiliary winding 4 to the reactor 1 is completed. Therefore, the installation of the auxiliary winding 4 is facilitated, and the risk of bending the auxiliary winding 4 can be suppressed, so that the quality of the reactor 1 is improved.

Further, the auxiliary winding support 6 has an annular inner frame 61 and an outer frame 62 and a groove portion 64 between the inner frame 61 and the outer frame 62 . The auxiliary winding 4 is arranged to be wired in the groove portion 64 . As a result, it is sufficient to wind the auxiliary winding 4 around the inner frame 61 while applying tension, so that installation on the auxiliary winding support 6 is facilitated. Therefore, the installation of the auxiliary winding 4 becomes easier.

In addition, the core 3 has a closed ring shape including a plurality of legs such as the fitting leg 32 and the connection leg 33 and the yoke 31 connecting the legs, and the core coating resin 5 covers the yoke 31. It has a yoke housing portion 52 for covering. The auxiliary winding 4 is sandwiched between the yoke accommodating portion 52 and the auxiliary winding support 6 . As a result, the possibility that the auxiliary winding 4 is loosened is suppressed, there is no need to complicate the winding method to prevent the auxiliary winding 4 from being loosened, and the auxiliary winding 4 can accurately capture the magnetic flux. .

Further, the outer frame 62 of the auxiliary winding support 6 has curved corners 623 separated from the auxiliary winding 4 . This can prevent the auxiliary winding 4 from protruding from the corner of the outer frame 62 and passing through the outside of the U-shaped bottom side wall portion 622 while the auxiliary winding 4 is being wound around the auxiliary winding support 6 . . Therefore, loosening of the auxiliary winding 4 is suppressed. Moreover, the winding diameter of the auxiliary winding 4 does not increase, and the bulkiness of the reactor 1 can be prevented.

Further, the auxiliary winding 4 has a lead wire 41 drawn out from the auxiliary winding support 6 and a curved region 42 on the opposite side of the lead wire 41 by 180 degrees. The outer frame 62 of the auxiliary winding support 6 has a U-shaped bottom side wall portion 622 that faces the curved region 42 of the auxiliary winding 4 and regulates the position of the curved region 42 . As a result, even if the curved region 42 tries to bulge toward the outer frame 62 , the U-shaped bottom wall portion 622 prevents it. Therefore, the auxiliary winding 4 is wound with a specified radius, preventing radial expansion and preventing the reactor 1 from becoming bulky.

The above embodiments of the present invention are presented as examples, and are not limited to the above embodiments. The above embodiment can be implemented in various other forms, and various omissions, replacements, and modifications can be made without departing from the scope of the invention. The embodiments and modifications thereof are included in the scope of the present invention.

1 reactor 2 main coil 21 lead wire 3 core 31 yoke portion 32 fitting leg portion 32a protrusion 32b discontinuity region 33 connection leg portion 4 auxiliary winding 41 lead wire 42 bending region 5 core coating resin 51 short leg resin portion 52 yoke accommodation Portion 53 Main coil insertion portion 54 Connection leg accommodation portion 55 Auxiliary winding stopper 56 Long leg resin portion 57 Yoke accommodation portion 58 Main coil insertion portion 59 Connection leg accommodation portion 6 Auxiliary winding support 61 Inner frame 62 Outer frame 621 Side wall portion 622 U-shaped bottom side wall portion 623 curved corner portion 63 flat portion 64 groove portion 65 exposed surface 66 coil stopper 67 fitting claw 68 eaves portion

Claims (5)

a main coil through which current flows from the outside;
a core containing a magnetic material and to which the main coil is mounted;
a core-coating resin that coats the core and intervenes between the core and the main coil;
an auxiliary winding into which the magnetic flux of the main coil enters to generate a current;
an auxiliary winding support separate from the core covering resin, which supports the auxiliary winding and is installed on the core covering resin such that the auxiliary winding fits into the core;
to provide
A reactor characterized by the core has a closed ring shape including a plurality of legs and a yoke connecting the legs,
The core covering resin has a yoke accommodating portion that covers the yoke portion,
the auxiliary winding is sandwiched between the yoke housing and the auxiliary winding support;
The reactor according to claim 1, characterized by: The auxiliary winding support is
annular inner and outer frames;
a groove between the inner frame and the outer frame;
has
The auxiliary winding is wired in the groove,
The reactor according to claim 1 or 2, characterized by: the outer frame of the auxiliary winding support has a corner spaced apart from the auxiliary winding;
The reactor according to claim 3, characterized by: The auxiliary winding is
lead wires extending from the auxiliary winding support;
a curved region 180 degrees opposite to the lead wire;
has
the outer frame of the auxiliary winding support has a wall facing the curved region of the auxiliary winding and regulating the position of the curved region;
The reactor according to claim 3 or 4, characterized by:

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