JP2023097800A - Reactor - Google Patents

Abstract

To provide a reactor in which an auxiliary winding is fitted with high precision.SOLUTION: A reactor 1 comprises a main coil 2, a core 3, core coating resin 5, an auxiliary winding 4, and a fit-in part 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 has an annular part 42 where one or more windings are wound. The auxiliary winding generates a current when it receives a magnetic flux of the main coil 2. The fit-in part 6 extends from the core coating resin 5, and supports the auxiliary winding 4 when the auxiliary winding 4 is fitted therein.SELECTED DRAWING: Figure 5

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. This 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.

After the auxiliary winding is wound around the leg and pulled out, it is fixed to the resin with an adhesive tape or the like. As reactors become smaller, it is becoming more difficult to keep the auxiliary windings fixed at the desired position with adhesive tape in such a narrow area. Fear can also arise.

The present invention has been proposed to solve the above problems, and an object of the present invention is to provide a reactor in which an auxiliary winding is accurately attached.

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 having an annular portion wound with one or more turns and receiving the magnetic flux of the main coil to generate current, and the core coating resin an inserting portion that extends from and supports the auxiliary winding by inserting the auxiliary winding.

The fitting portion may have a pair of spaced-opposing sandwiching walls, and the auxiliary winding may have the annular portion sandwiched between the pair of sandwiching walls.

One of the pair of holding walls may be a partition wall separating the auxiliary winding and the main coil.

The insertion portions may be provided at two locations facing each other with the annular portion of the auxiliary winding interposed therebetween.

The auxiliary winding has lead wires extending in the same direction from both ends of the annular portion. A support wall may be provided for supporting a curved range of the annular portion that is 180 degrees opposite to the lead wire.

The auxiliary winding has lead wires extending in the same direction from the annular portion, and the core coating resin extends facing the annular portion of the auxiliary winding, It may have a contact wall facing a curved range 180 degrees opposite to the lead wire, and the contact wall may face the curved range on the lead wire side surface.

The core coating resin has an L-shaped portion that includes the support wall, and the L-shaped portion extends toward the annular portion of the auxiliary winding. The contact wall has a contact wall facing the opposite curved range, and the support wall bent and extending from the contact wall, and the contact wall faces the curved range on the lead wire side surface. , the support wall may be bent and extended from the contact wall toward the lead wire.

According to the present invention, the auxiliary winding is attached with high accuracy, and 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. It is a perspective view of a short leg resin portion. 4 is a plan view of the short leg resin portion viewed from a direction perpendicular to the length direction of the yoke accommodating portion, the main coil insertion portion, and the connecting leg accommodating portion; FIG. FIG. 5 is a side view of the short leg resin portion along the length direction of the yoke accommodating portion and viewed from a direction perpendicular to the length direction of the main coil insertion portion and the connecting leg accommodating portion; FIG. 10 is a front view of the short leg resin portion seen from a direction perpendicular to the length direction of the yoke housing portion and along the length direction of the main coil insertion portion and the connection leg housing portion; 4 is an enlarged view showing the vicinity of the boundary between the main coil and the auxiliary winding; FIG.

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 mounted 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 conductive wire of 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. be. As the main coil 2, for example, a flatwise coil can also be employed.

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 core 3 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 type 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 coated with a core coating resin 5 , and after being coated with the core coating resin 5 , the main coil 2 and the auxiliary winding 4 are attached to the core 34 . The core coating resin 5 protects the core 3 from mechanical impacts and covers at least the portions where the main coil 2 and the auxiliary winding 4 are close to the core 3, thereby 3 is insulated.

The core covering resin 5 has an auxiliary winding stopper 55 extending from the lattice-like surface 52a, and the lead wire 41 drawn out from the attached auxiliary winding 4 is locked so as not to come off. The lattice surface 52a is parallel to a plane including the yoke portion 31, the fitting leg portion 32, and the connection leg portion 33, and when the core coating resin 5 is viewed from a direction perpendicular to the lattice surface 52a, the surface looks like a lattice. is. 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.

Examples of the material of the core coating resin 5 include epoxy resin, unsaturated polyester resin, urethane resin, BMC (Bulk Molding Compound), PPS (Polyphenylene Sulfide), PBT (Polybutylene Terephthalate), and composites thereof. The coating resin 5 has insulation and heat resistance. A thermally conductive filler may be mixed in the core coating resin 5 .

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 . Also, the connecting leg portion 33 exposed from the connecting leg accommodating portion 59 is inserted into the connecting leg accommodating portion 54 . Then, the main coil inserting portion 53 of the short leg resin portion 51 and the main coil inserting 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 connection leg of the long leg resin portion 56 are arranged to face each other. The cores 3 are assembled in a closed loop with the accommodation portions 59 facing each other. 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, It is attached to the main coil insertion portion 53 so as to be pulled out from between the coil insertion portion 53 and the adjacent connecting leg housing portion 54 .

5 to 8 show how the auxiliary winding 4 is installed on the short leg resin portion 51. FIG. 5 is a perspective view of the short leg resin portion 51, and FIG. 7 is a plan view seen from a direction perpendicular to the length direction of the connecting leg accommodating portion 54, FIG. FIG. 8 is a side view seen from an orthogonal direction, and FIG. 8 is a front view seen from a direction perpendicular to the length direction of the yoke housing portion 52 and along the length direction of the main coil insertion portion 53 and the connection leg housing portion 54. is.

The length direction of the main coil insertion portion 53 and the connecting leg housing portion 54 is the direction along the winding axis of the main coil 2, and the length direction of the yoke housing portion 52 is the direction along which the main coil insertion portion 53 and the connection leg housing portion 54 are. It means the direction in which the leg accommodating portions 54 are arranged and the direction perpendicular to the winding axis of the main coil 2 .

As shown in FIGS. 5 and 6 , first holding walls 62 extend toward the main coil insertion portion 53 from the connecting leg housing portions 54 extending on both sides of the main coil insertion portion 53 . The first holding wall 62 is a plate piece extending from the outer surface of the connecting leg accommodating portion 54 to the insertion portion facing surface 54 a facing the main coil insertion portion 53 . The first holding wall 62 allows the auxiliary winding 4 whose thickness is elastically deformed to pass through the gap between the first holding wall 62 and the main coil insertion portion 53, and restores the diameter after elastic deformation. is so close to the main coil insertion portion 53 that the restored auxiliary winding cannot pass through.

In addition, the first holding wall 62 is narrower than the diameter of the auxiliary winding 4 when no external force is applied to reduce the diameter, and is larger than the diameter when the auxiliary winding 4 is elastically deformed to the maximum extent. , and extends apart from the inner side surface 52 b of the yoke housing portion 52 . The inner side surface 52b is the surface of the yoke housing portion 52 from which the main coil insertion portion 53 and the connecting leg portion housing portion 54 extend.

The auxiliary winding 4 is hooked on the main coil insertion portion 53 in a state of being wound so as to form an annular portion 42 which is a ring of one or more turns, and the first holding wall 62 and the main coil insertion portion 53 are connected. The first holding wall 62 and the inner side surface 52 b of the yoke accommodating portion 52 hold the yoke housing portion 52 . That is, the inner side surface 52b of the yoke accommodating portion 52 forms a second holding wall 61 facing the first holding wall 62 with a gap therebetween. The first holding wall 62 and the second holding wall 61 form a fitting portion 6 that supports the auxiliary winding 4 by fitting and holding the auxiliary winding 4 .

Since the first holding walls 62 extend to the connection leg accommodating portions 54 on both sides of the main coil insertion portion 53 , the fitting portions 6 are positioned on both sides of the main coil insertion portion 53 . The pair of fitting portions 6 support the annular portion 42 of the auxiliary winding 4 from two opposing positions. If the direction orthogonal to the direction from the connecting leg accommodating portion 54 toward the main coil inserting portion 53 and the extending direction of the connecting leg accommodating portion 54 and the main coil inserting portion 53 is called the vertical direction, the first narrow The retaining wall 62 may have a predetermined length in the vertical direction so that the auxiliary winding 4 does not come off easily.

Next, as shown in FIGS. 7 and 8, an L-shaped portion 7 is formed in the main coil insertion portion 53 of the short leg resin portion 51 of the core covering resin 5 . The L-shaped portion 7 has a contact wall 72 erected on the main coil insertion portion 53 and a support wall 71 extending from the tip of the contact wall 72 . It is letter-shaped. The L-shaped portion 7 is formed on a winding stopper opposite surface 53b of the main coil insertion portion 53 opposite to the winding stopper surface 53a. The winding stop surface 53a is a surface of the main coil insertion portion 58 facing in the same direction as the grid surface 52a from which the auxiliary winding stop 55 for holding the auxiliary winding 4 extends.

The abutment wall 72 rises from the surface 53 b of the main coil insertion portion 53 opposite to the winding stop to a height exceeding at least the diameter of the conductive wire of the auxiliary winding 4 . The support wall 71 extends in a direction perpendicular to or oblique to the rising direction of the contact wall 72, and has a length that is at least equal to or greater than the diameter of the conductive wire of the auxiliary winding 4 from the base connected to the contact wall 72 to the extended tip. is extended by

Here, of the directions from the contact wall 72 to the lead wires 41 of the auxiliary winding 4, the component along the extending direction of the main coil insertion portion 63 is called a lead wire direction 41a. Further, the contact surface 72a is the base end, the contact surface 72a extends perpendicularly to the contact surface 72a, and the direction away from the contact surface 72a is called the contact surface direction 72b. At this time, the contact surface 72a is set so that the component along the extending direction of the main coil insertion portion 63 in the contact surface direction 72b matches the lead wire direction 41a. That is, the surface of the contact wall 72 facing the lead wire 41 side is set as the contact surface 72a. When the contact wall 72 extends perpendicularly to the winding axis of the main coil insertion portion 53, the lead wire direction 41a and the contact surface direction 72b of the contact surface 72a face the same direction. When the contact wall 72 extends so as to obliquely cross the winding axis of the main coil insertion portion 53, the angle formed by the lead wire direction 41a and the contact surface direction 72b is at least less than 90 degrees.

Further, the support wall 71 is arranged so that, of the direction in which the support wall 71 extends with the contact wall 72 as the base end, the component along the extension direction of the main coil insertion portion 63 is the same direction as the lead wire direction 41a. , bend and extend. When the contact wall 72 extends perpendicular to the winding axis of the main coil insertion portion 53 and the support wall 71 extends in the direction perpendicular to the contact wall 72, the support wall 71 is aligned with the lead wire direction 41a. It bends and extends in the same direction. When the support wall 71 extends in a direction oblique to the contact wall 72, the angle between the direction in which the support wall 71 extends with the contact wall 72 as the base end and the lead wire direction 41a is less than 90 degrees at maximum. In addition, the support wall 71 bends and extends, preferably in the same direction as the lead wire direction 41a.

The auxiliary winding 4 is hooked on the main coil insertion portion 53 while being wound so as to form an annular portion 42 that is a ring of one or more turns. At this time, the annular portion 42 of the auxiliary winding 4 is L-shaped so that the curved range 42a of the annular portion 42, which is 180 degrees opposite to the lead wire 41, faces the contact surface 72a of the contact wall 72. Hook on 7.

When the lead wire 41 is pulled to tighten the annular portion 42 of the auxiliary winding 4 , the curved area 42 a is restricted by the contact wall 72 from moving in the direction opposite to the direction of the lead wire 41 a , thereby tightening the auxiliary winding 4 . The annular portion 42 is positioned. Also, the annular portion 42 is pressed against the pair of fitting portions 6 with the contact wall 72 as a fulcrum, and enters the gap between the first holding wall 62 of the fitting portion 6 and the main coil insertion portion 53, thereby It is fitted and held between 62 and the second holding wall 61 . After that, by hooking the lead wire 41 on the auxiliary winding stopper 55, the auxiliary winding 4 is installed at a position accurately positioned by the contact walls 72 of both the fitting portions 6 and the L-shaped portion 7. .

Further, the support wall 71 supports a curved range 42a that is 180 degrees opposite to the lead wire 41 from a direction perpendicular to the surface of the annular portion 42. As shown in FIG. Therefore, the auxiliary winding 4 is prevented from loosening so that the annular portion 42 expands in diameter.

FIG. 9 is an enlarged view showing the vicinity of the boundary between the main coil 2 and the auxiliary winding 4. As shown in FIG. After installing the auxiliary winding 4, while inserting the main coil 2 into the main coil insertion portion 58 of the long leg resin portion 56, the short leg resin portion 51 on which the auxiliary winding 4 is installed and the long leg resin portion 56 are connected. are connected to complete the core coating resin 5 . At this time, the main coil 2 contacts the first holding wall 62 of the fitting portion 6, as shown in FIG. That is, the first holding wall 62 of the fitting portion 6 serves as a partition, and the main coil 2 and the auxiliary winding 4 are separated so as to secure an insulation distance.

Therefore, the thickness of the first holding wall 62, i.e., the length of the main coil 2 in the winding axis direction, should be It may be a length that ensures an insulation distance between the coil 2 and the auxiliary winding 4 . Further, when the direction perpendicular to the direction from the connecting leg accommodating portion 54 toward the main coil inserting portion 53 and the extending direction of the connecting leg accommodating portion 54 and the main coil inserting portion 53 is referred to as the vertical direction, it is the first grip. The wall 62 may extend continuously from the upper end to the lower end of the connecting leg accommodating portion 54 in the vertical direction. You can line up. These lengths in the vertical direction are also required to secure strength for holding the auxiliary winding 4 without breaking the first holding wall 62, and also to ensure that the main coil 2 and the auxiliary winding 4 are separated from each other. It may be a length that ensures insulation between

In this manner, the reactor 1 includes the main coil 2 , the core 3 , the core coating resin 5 , the auxiliary winding 4 and the fitting portion 6 . A current is applied to the main coil 2 from the outside, and the main coil 2 is mounted on the core 3 containing a magnetic material. 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 has an annular portion 42 with one or more turns, into which the magnetic flux of the main coil 2 enters to generate current. The fitting portion 6 extends from the core coating resin 5 and supports the auxiliary winding 4 by fitting the auxiliary winding 4 therein.

As a result, when the auxiliary winding 4 is shaped so as to form an annular portion 42 having one or more turns, the annular portion 42 is hooked on the main coil insertion portion 53 and the lead wire 41 is pulled. can be attached at a desired position with high precision, the quality of the reactor 1 can be improved, and the auxiliary winding 4 can take in the magnetic flux of the main coil 2 with high precision.

For example, the fitting portion 6 has first and second spaced-opposed pinching walls 62 and 61, and the auxiliary winding 4 has a first pinching wall 62 and a second pinching wall 61. It is made to be pinched by the holding wall 61. - 特許庁In addition, the fitting portions 6 are provided at two locations facing each other with the annular portion 42 of the auxiliary winding 4 interposed therebetween.

The fitting portion 6 is not limited to this, and the first holding wall 62 may be erected on the main coil insertion portion 53 side, or a gap through which the auxiliary winding 4 whose diameter is reduced by applying an external force can pass is provided. Alternatively, the first holding wall 62 may stand on both the insertion portion facing surface 54 a of the connection leg housing portion 54 and the main coil insertion portion 53 . Further, as long as the auxiliary winding 4 can be supported, the insertion portion 6 may be provided at one position, or may be provided at three or more positions equidistantly arranged on the circumference.

The first holding wall 62 is a partition wall separating the auxiliary winding 4 and the main coil 2 . Thereby, it is possible to function not only as a member for supporting the auxiliary winding 4 but also as a member for insulating the auxiliary winding 4 and the main coil 2 .

In addition, the auxiliary winding 4 has lead wires 41 drawn out in the same direction from both ends of the annular portion 42 . The reactor 1 includes a support wall 71 that extends in a direction perpendicular to or oblique to the annular portion 42 and supports a curved range 42a of the annular portion 42 of the auxiliary winding 4 that is 180 degrees opposite to the lead wire 41. I made it

As a result, even if the annular portion 42 tries to expand, it is blocked by the support wall 71 . Therefore, the auxiliary winding 4 is wound with a specified radius, is prevented from expanding in the radial direction, and is prevented from loosening. Then, the auxiliary winding 4 can take in the magnetic flux of the main coil 2 with high accuracy, and the bulkiness of the reactor 1 can be prevented.

Further, the core coating resin 5 extends toward the annular portion 42 of the auxiliary winding 4, and has a contact wall 72 facing the curved range 42a of the annular portion 42, which is 180 degrees opposite to the lead wire 41. bottom. The contact wall 72 faces the curved range 42a at the contact surface 72a on the lead wire 41 side.

As a result, when the lead wire 41 is pulled to tighten the annular portion 42 of the auxiliary winding 4, the curved range 42a is restricted by the abutment wall 72 from moving in the direction opposite to the lead wire orientation 41a. The ring 42 of the wire 4 is positioned. Also, the annular portion 42 is pressed against the pair of fitting portions 6 with the contact wall 72 as a fulcrum, and enters the gap between the first holding wall 62 of the fitting portion 6 and the main coil insertion portion 53 . Therefore, the auxiliary winding 4 is easily and accurately supported by the insertion portion 6, the auxiliary winding 4 can take in the magnetic flux of the main coil 2 more accurately, and the quality of the reactor 1 is improved.

Although the L-shaped portion 7 composed of the support wall 71 and the contact wall 72 is provided upright in the main coil insertion portion 53, the support wall 71 and the contact wall 72 are provided at separate locations. may

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.

For example, the contact wall 72 of the L-shaped portion 7 may extend from the yoke housing portion 52 of the short leg resin portion 51 . Further, the curved range 42 a of the annular portion 42 may face the surface of the contact wall 72 opposite to the surface facing the lead wire 41 . At this time, the support wall 71 is arranged such that, of the direction in which the support wall 71 extends with the contact wall 72 as the base end, the component along the direction in which the main coil insertion portion 63 extends is exactly opposite to the lead wire direction 41a. Bend and extend.

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 41a lead wire direction 42 annular portion 42a bending range 5 core coating resin 51 Short leg resin portion 52 Yoke accommodating portion 52a Grid surface 52b Inner surface 53 Main coil insertion portion 53a Winding stopper surface 53b Winding stopper opposite surface 54 Connection leg accommodating portion 54a Insertion portion facing surface 55 Auxiliary winding stopper 56 Long leg resin Portion 57 Yoke housing portion 58 Main coil insertion portion 59 Connection leg housing portion 6 Fitting portion 61 Second holding wall 62 First holding wall 7 L-shaped portion 71 Support wall 72 Contact wall 72a Contact surface 72b Contact surface direction

Claims (7)

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 having an annulus of one or more turns and into which the magnetic flux of the main coil enters to generate a current;
an insertion portion extending from the core coating resin and supporting the auxiliary winding by being fitted with the auxiliary winding;
to provide
A reactor characterized by The fitting portion has a pair of holding walls facing each other with a gap therebetween,
The annular portion of the auxiliary winding is held between the pair of holding walls;
The reactor according to claim 1, characterized by: one of the pair of holding walls is a partition separating the auxiliary winding and the main coil;
The reactor according to claim 2, characterized by: The insertion portions are provided at two locations facing each other with the annular portion of the auxiliary winding interposed therebetween;
The reactor according to any one of claims 1 to 3, characterized by: The auxiliary winding has lead wires extending in the same direction from the annular portion,
The core coating resin is provided with a support wall that extends in a direction perpendicular to or oblique to the annular portion and supports a curved range of the annular portion of the auxiliary winding that is 180 degrees opposite to the lead wire,
The reactor according to any one of claims 1 to 4, characterized by: The auxiliary winding has lead wires extending in the same direction from both ends of the annular portion,
The core coating resin has an abutment wall that extends toward the annular portion of the auxiliary winding and faces a curved range of the annular portion that is 180 degrees opposite to the lead wire,
the contact wall faces the curved range on the lead wire side surface;
The reactor according to any one of claims 1 to 4, characterized by: The core coating resin has an L-shaped portion including the support wall,
The L-shaped portion is
an abutment wall that extends toward the annular portion of the auxiliary winding and faces a curved range of the annular portion that is 180 degrees opposite to the lead wire;
the support wall bent and extending from the contact wall;
has
The contact wall faces the curved range on the lead wire side surface,
the support wall extends from the contact wall while bending toward the lead wire;
The reactor according to claim 5, characterized by:

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