JP5778401B2 - Core fixture and coil device - Google Patents

Description

  The present invention relates to a coil device such as a reactor in which a core is arranged in a coil, and a core fixing tool for fixing the core to a case.

(Definition of terms)
In the following description, a material that is relatively strongly magnetized in a magnetic field (for example, a ferromagnetic material, a ferrimagnetic material, and an antiferromagnetic material) is referred to as a magnetic material, and a material that is not strongly magnetized (for example, a paramagnetic material, an antiferromagnetic material). (Magnetic material) is called non-magnetic material.

(Background technology)
A reactor is a passive element that gives inductive reactance to an AC component, and is used in an inverter circuit, an active filter circuit, a DC booster circuit, and the like. In hybrid vehicles and electric vehicles that have been put into practical use in recent years, reactors are used for DC buck-boost converters and the like that are key devices of drive systems. Generally, a reactor having a relatively large capacity for an electric vehicle or the like has a structure in which a magnetic core (core) which is a magnetic material formed in an annular shape and a winding (coil) wound around the core are accommodated in a heat dissipation case. have. In order to prevent magnetic saturation, a structure (divided core) in which the core is divided into multiple pieces on a plane perpendicular to the magnetic flux, and a non-magnetic gap member is inserted between the divided surfaces is generally adopted. Has been.

  Since the core generates heat due to energy loss such as iron loss, it is important to secure sufficient heat conduction from the core to the heat dissipation case in attaching the core to the heat dissipation case. Further, in a reactor used for a DC step-up / step-down converter or the like, energy accumulation and release are repeated at a high rate, so that vibration and noise are generated due to core magnetostriction and electromagnetic attraction. When the split core is used, this vibration is strongly generated particularly in the direction perpendicular to the gap surface of the split core.

  Patent Document 1 discloses a leaf spring type fixture that clamps the core in the heat dissipation case by pressing the core against the bottom and side surfaces inside the heat dissipation case with an elastically deformable fixture formed of a metal plate. Has been. Adopting a fixing structure (metal touch structure) in which the core is in close contact with the heat radiating case as described above can ensure good heat radiating characteristics. However, the reactor of the metal touch structure has a drawback that since the core is in direct contact with the heat radiating case, vibration generated in the core is transmitted to the case with almost no attenuation, and a large noise is generated during operation.

  Therefore, as disclosed in Patent Document 2, a fixing structure (floating structure) that uses a stay to support the core without contacting the heat radiating case has been proposed. The conventional stay disclosed in Patent Document 2 is obtained by bending an elongated rectangular metal plate into an L shape. The core is a core in which a split core consisting of a plurality of core pieces (magnetic bodies) arranged in an annular shape is coated with resin by injection molding (insert molding), and one end of the stay is embedded in the resin when insert molding the core It is fixed to the core. In addition, a flat washer-like fixing part is formed at the other end of the stay. By fixing this fixing part to the heat dissipation case with a bolt, the core is fixed to the heat dissipation case via the stay while floating from the heat dissipation case. Is done. In this fixing structure, since the core is not brought into direct contact with the heat radiating case, the transmission of vibration from the core to the heat radiating case is small, and the noise generated by the reactor can be reduced.

JP 2010-123927 JP 2009-26952 A

  However, the stay disclosed in Patent Document 2 cannot allow a large displacement due to elastic deformation because the length (spring length) of the elastically deformable portion is short. Further, since it has a structure in which a relatively wide metal plate is bent in an L shape, only elastic deformation in the bending direction is allowed. Therefore, the range in which the position of the flat washer-like fixing portion can be adjusted by elastically deforming the stay is narrow, and high dimensional accuracy is required for each component. Therefore, the mold for forming the stay is also relatively expensive. It will be a thing. Further, since the number of parts to be assembled at the time of insert molding is large and high assembling accuracy is required, the insert molding setup process becomes complicated and careful. Therefore, the insert molding setup requires a very long working time and the processing cost is high.

  A floating structure can also be realized by a configuration in which the core is sandwiched from both sides in three directions by a fixture as disclosed in Patent Document 1. However, in order to arrange the core with high positional accuracy in the heat dissipation case by this fixing method, it is necessary to precisely adjust the balance of the load applied to the core by each fixing tool. For this reason, it is necessary to perform load calculation when designing the fixture, and there is a problem that the load calculation has to be performed again even when a slight structural change is made, and the design burden is heavy. In addition, since a high part accuracy is required for the fixture, the mold for producing the fixture is also relatively expensive.

  If the positioning accuracy of the core relative to the heat dissipation case is low, the relative positional accuracy between the coil fixed to the core and the bus bar fixed to the heat dissipation case via the terminal block also decreases, and the coil and the bus bar are welded. The problem that work becomes difficult arises. In particular, in the floating structure, the heat radiation characteristics vary greatly depending on the thickness of the filler filled between the core and the heat radiation case, and the performance of the reactor is affected accordingly. Therefore, in order to ensure the performance of the reactor, it is necessary to attach the core to the heat radiating case with a certain positioning accuracy.

  A core fixing structure that simultaneously solves these problems has not been proposed. The present invention has been made in view of such circumstances.

  A core fixture for fixing a core of a coil device to a case according to an embodiment of the present invention is provided. A core fixture according to an embodiment of the present invention includes a case fixing portion that is fixed to a case with a bolt, a core fixing portion that is fixed to the core with a bolt, and an arm portion that connects the core fixing portion and the case fixing portion. I have.

  The core fixture with such a configuration is positioned sufficiently to dissipate the core evenly without designing and adjusting the load balance like the leaf spring type core fixture that sandwiches and holds the core from both sides. The core can be mounted in the case with accuracy. In addition, the core fixing tool, which is a relatively large part, is not embedded in the core by insert molding, but is configured to be fixed to the core after molding with a bolt, so that the setup during core molding (parts to mold) Assembly) and production efficiency is improved.

  The arm part is elastically deformable so that the relative position between the core fixing part and the case fixing part changes.

  With this configuration, even if an error occurs in the dimensions of the core, the core can be easily mounted in the case by elastically deforming the arm portion. Further, since the propagation of the high frequency vibration in the audible range to the case is suppressed by the low natural frequency of the arm portion, noise generated when a voltage including a high frequency component is input to the coil device is reduced. .

  In the core fixing part and the case fixing part, it is desirable that a recess having a curved outline is formed near the base of the arm part.

  With this configuration, the case fixing portion is prevented from being damaged by stress concentration near the base of the arm portion.

  The core fixing part and the case fixing part are each arranged on a plane parallel to the XY plane, the first fixing hole through which the bolt passes is formed in the core fixing part, and the second through which the bolt passes. It is desirable that the first through hole and the second through hole are configured not to overlap each other in a projected view on a plane in which the through hole is formed and the core fixing portion is disposed.

  With such a configuration, the core can be easily fixed to the case with a bolt from one direction (Z-axis direction) perpendicular to the XY plane.

  Typically, the core fixture is formed by sheet metal processing from a single metal plate. In addition, one best form of core fixing tool includes one case fixing portion disposed on a first plane parallel to the XY plane and two core fixing portions disposed on a second plane parallel to the XY plane. A left core fixing portion and a right core fixing portion, which are core fixing portions, and a left arm portion and a right arm portion, which are two arm portions, are provided. The left arm when the positive direction in the X-axis direction is the front side, the negative direction in the X-axis direction is the back side, the positive direction in the Y-axis direction is the left side, and the negative direction in the Y-axis direction is the right side. Is connected to the left edge of the rear edge of the case fixing part and the right edge of the rear edge of the left core fixing part, and the right arm part is connected to the right and right edges of the rear edge of the case fixing part. The left end of the edge on the back side of the core fixing part is connected.

  Moreover, the coil apparatus by which the coil which distribute | arranged the core inside based on embodiment of this invention was accommodated in the case is provided. In the coil device according to the embodiment of the present invention, both ends of the core are fixed to the case by the above-described core fixing tool.

  Typically, the core is a split core in which a plurality of core pieces are stacked (stacked) in one direction and fixed together, and the core fixture has both ends in the stacking direction of the core (the direction in which the core pieces are stacked). Attached to.

  In this case, the core includes a pair of nuts that are disposed at both ends of the core in the stacking direction and the core fixing portions are fixed with bolts, and the core is continuously formed between the pair of nuts. It is desirable.

  In such a configuration, the force in the stacking direction applied from the core fixture to the core propagates as a compressive force or a tensile force in the core, so that a large shear force does not occur in the core. When this configuration is applied when using a core having low shear strength such as a dust core, cracks and the like are prevented from occurring in the core.

  Moreover, it is desirable that the core fixture is configured to contact the core only at the core fixing portion. With this configuration, the effective length of the arm portion that functions as a spring that supports the core can be increased, and a high noise reduction effect by the core fixture can be obtained.

  Moreover, you may further provide the terminal block. In this case, it is desirable that the bus bar and the lead portion extend in a direction connecting both ends of the core at a place where the bus bar of the terminal block and the lead portion of the coil are welded. With this configuration, even if a large error occurs in the position of the lead portion in the direction connecting both ends of the core, the bus bar and the lead portion can be welded as they are without using a spacer or deforming the lead portion or the bus bar. , Can improve the workability and quality of welding.

  By using the core fixture according to the embodiment of the present invention, there is an advantage that a low noise and low vibration floating structure can be realized in a compact and low cost.

It is an exploded view of the reactor which concerns on embodiment of this invention. It is a perspective view of the reactor main body which concerns on embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is an external view of the core fixing tool which concerns on embodiment of this invention; (a) Perspective view, (b) Top view, (c) Back view, (d) Side view It is a top view which shows the state which accommodated the reactor main body which concerns on embodiment of this invention in the case. It is A sectional drawing in FIG. It is a completed figure of the reactor which concerns on embodiment of this invention. It is an enlarged view which shows the positional relationship of the bus bar of a terminal block in this embodiment, and the lead part of a coil. It is an enlarged view which shows the positional relationship of the bus bar of the conventional terminal block, and the lead part of a coil.

  Hereinafter, the reactor 1 which concerns on embodiment of this invention is demonstrated in detail, referring drawings. FIG. 1 is an exploded view of the reactor 1, and FIG. 2 is a perspective view of the main body 1 a of the reactor before being housed in the case 50. In the following description, the direction from the lower left side to the upper right side in FIG. 1 is the width direction (X axis direction), the direction from the lower right side to the upper left side is the depth direction (Y axis direction), and from the lower side to the upper side. The direction to go is defined as the height direction (Z-axis direction). In addition, when using the reactor 1, you may arrange | position the reactor 1 toward what direction.

  The reactor 1 includes a pair of U-shaped core units 20a, two gap members 30, a coil 40, a case 50, and two core fixtures 10 for attaching the core unit 20a to the case 50, respectively.

  The pair of U-shaped core units 20 a form a ring-shaped core 20 by abutting two end surfaces of each of the U-shaped core units 20 a through the gap member 30. The gap member 30 is a plate material formed from non-magnetic ceramics or resin such as alumina. Engagement protrusions 24a and 24b and engagement recesses 24c and 24d for positioning and abutting the end faces are formed on the periphery of each end face of the U-shaped core unit 20a. The core 20 of the present embodiment is assembled from two identical U-shaped core units 20a, but two or more different structures (for example, the number of core pieces to be included and the shape of a resin molding portion described later) are different. A U-shaped core unit may be assembled, or a plurality of core pieces may be joined together with an adhesive to form a ring shape.

  The U-shaped core unit 20a is not a single magnetic member formed of only a magnetic material, but a plurality of core pieces 20c (magnetic material) stacked in the X-axis direction via the gap member 30 is a resin (non-magnetic material). Embedded in and made by injection molding (insert molding) (see FIG. 5). As the resin, a heat-resistant resin such as polyphenylene sulfide (PPS) is used. The core piece 20c used in the present embodiment is a dust core, but a silicon steel plate or ferrite may be used. The U-type core unit 20a of the present embodiment includes a pair of I-type core pieces arranged in parallel and one U-type core piece that connects adjacent end faces (gap surfaces) of the pair of I-type core pieces. They are arranged through gap members 30 having a predetermined plate thickness and molded by insert molding. In addition, at both end surfaces (gap surfaces) of the U-type core unit 20a, one end of the I-type core piece is exposed without being covered with resin.

  As shown in FIG. 1, a pair of brackets 21 (a left bracket 211 and a right bracket 212) for attaching the core fixture 10 are formed on the fixed surface 23 of the U-shaped core unit 20a. A nut 22 is embedded in each bracket 21 by insert molding.

  The coil 40 has a structure in which two winding portions having the same structure formed from a flat enameled wire are arranged in parallel and the winding starts are connected to each other. In addition, although the coil 40 of this embodiment is formed by processing one flat enameled wire, it may be formed by connecting two windings by welding or the like. After passing two winding portions of the coil 40 through two parallel straight portions (portions where the I-type core is embedded) of one U-type core unit 20a, the pair of U-type core units 20a correspond to each other. When each end face is abutted and bonded via the gap member 30, the reactor body 1a is formed.

  3A and 3B are projection views showing the appearance of the core fixture 10, wherein FIG. 3A is a perspective view, FIG. 3B is a plan view, FIG. 3C is a rear view, and FIG. In the following description, the upper, lower, left, and right directions of the core fixture 10 are defined by up, down, left, and right in the rear view of FIG. 3 (c), and the back side of the paper in FIG. 3 (c) rear view (upper side in FIG. 3 (b)). ) Is defined as the front, and the front side (the lower side in FIG. 3B) is defined as the rear.

  The core fixture 10 is a member for attaching the reactor main body 1a to the case 50 at both ends in the X-axis direction, and is formed by sheet metal working of a stainless steel plate. The core fixture 10 includes a case fixing part 11 fixed to the case 50 with bolts, two core fixing parts 12 (left core fixing part 121, right core fixing part 122) fixed to the core 20 with bolts, and case fixing. Two arms 13 (a left arm 131 and a right arm 132) for connecting the portion 11 and each core fixing portion 12 are provided.

  The case fixing part 11 and the core fixing part 12 are planar parts arranged in parallel to each other, and a through hole for bolting is formed in the approximate center.

  The case fixing portion 11 has a through hole 11h in the center, and is connected to the left arm 131 and the right arm 132 at the left and right ends of the edge on the back side. On the back side of the case fixing portion 11, a recess 11 a that is recessed forward is formed near the base of each arm 13. The concave portion 11a is formed by a curved line having a gentle outline, and relaxes the stress concentration near the base of each arm 13 to increase the strength of the core fixture 10.

  The left arm 131 and the right arm 132 extend downward from the back surface of the case fixing portion 11 and are connected to the left core fixing portion 121 and the right core fixing portion 122 at the lower ends, respectively. Each arm 13 is a rectangular portion that is long in the vertical direction, but the vicinity of the connection portion between the case fixing portion 11 and the core fixing portion 12 is gently curved surfaces 13a and 13b. The curved surfaces 13 a and 13 b alleviate stress concentration in the vicinity of the connection portion between the arm 13 and the case fixing portion 11 and the core fixing portion 12, thereby increasing the strength of the core fixing tool 10. The arm 13 that connects the case fixing portion 11 and the core fixing portion 12 (that is, the case 50 and the core 20 is connected) has a width that is less than half that of the conventional stay (the left and right sides in FIGS. 3B and 3C). The dimension in the direction) is long, and the elastically deformable part is also long. Specifically, the width of the arm 13 is 1/5 or less of the width of the case fixing portion 11 (the horizontal dimension in FIG. 3B) and the depth (the vertical dimension in FIG. 3B). 1/3 or less. The width of the arm 13 is 1/5 or less of the width of the core fixing part 12 and 1/3 or less of the depth. The length of the arm 13 is larger than the inner diameters of the through holes 11h and 12h and the outer diameters of the bolts 60 and 70, and is 1.5 times the outer diameter of the bolts 60 and 70 or more. Therefore, the arm 13 is sufficiently lower in rigidity than the case fixing part 11 and the core fixing part 12 (that is, the part having the lowest rigidity in the core fixing tool 10), and is more flexible than the conventional stay. . Further, the provision of the gently curved surfaces 13a and 13b at the connection portion between the case fixing portion 11 and the core fixing portion 12 also contributes to the improvement of flexibility. With this high flexibility, the relative positions of the case fixing portion 11 and the core fixing portion 12 can be changed in all directions by elastically deforming the arm 13. Further, this flexibility is configured to increase particularly in the X-axis direction.

  The left core fixing portion 121 and the right core fixing portion 122 have through holes 121h and 122h, respectively, at substantially the center. Further, the left core fixing portion 121 and the right core fixing portion 122 are respectively connected to the lower ends of the left arm 131 and the right arm 132 at the right end and the left end on the back side. Concave portions 121 a and 122 a that are recessed forward are also formed in the vicinity of the base of each arm 13 at the back side edge of each core fixing portion 12. The recesses 121a and 122a are also formed by curves with a gradual outline, which relieves stress concentration near the base of each arm 13 and increases the strength of the core fixture 10.

  Next, the assembly of the reactor main body 1a and the procedure for fixing the reactor main body 1a in the case 50 with the core fixture 10 will be described. FIG. 4 is a plan view showing a state in which the reactor main body 1 a is accommodated in the case 50. FIG. 5 is a cross-sectional view taken along the line AA in FIG. FIG. 6 is a perspective view showing the reactor 1 in a completed state by further filling the case with a filler 90.

  In assembling the reactor main body 1a, first, the two winding portions of the coil 40 are passed through each linear portion of one U-shaped core unit 20a, and the end surfaces of the pair of U-shaped core units 20a are bonded via the gap member 30. Bond together with the agent. Next, the pair of bonded U-shaped core units 20a is mounted on a dedicated jig (not shown) and held at a predetermined temperature for a predetermined time while applying a predetermined adhesive pressure in the X-axis direction (FIG. 1). To cure the adhesive. When the adhesive is cured, the core 20 is removed from the jig, and the core fixture 10 is attached to the core 20 with the bolt 60. Specifically, the bolt 60 was passed through the through hole 121h of the left core fixing portion 121 and the through hole 122h of the right core fixing portion 122 of the core fixture 10, respectively, and then embedded in the brackets 211 and 212 of the core 20. The core fixture 10 is attached to the core 20 by screwing into the nut 22.

  Next, the reactor main body 1 a to which the core fixture 10 is attached is attached to the case 50 with the bolts 70. Specifically, by passing the bolt 70 through the through hole 11 h provided in the case fixing portion 11 of each core fixture 10, the bolt 70 is screwed into the female screw 52 t provided in the mounting base 52 formed in the case 50. The reactor body 1a is attached to the case 50. Next, the terminal block 80 is fixed to the case 50 with bolts, and the bus bars 81 and 82 of the terminal block and the lead portions 41 and 42 of the coil 40 are joined by welding or the like, respectively. Finally, a filler 90 such as a silicone resin or an epoxy resin having insulating properties and high thermal conductivity is filled in the case 50, and the reactor 1 is completed.

  In the floating structure in which the reactor main body 1a is not brought into contact with the case 50 as in the present embodiment, the heat generated by the reactor main body 1a is transferred to the case 50 via the filler 90 filled in the gap between the reactor main body 1a and the case 50. Communicated. Although resin with relatively good thermal conductivity is used for the filler 90, it is necessary to set a narrow gap between the case 50 and the reactor body 1a in order to ensure sufficient heat dissipation characteristics. In addition, when the temperature distribution of the reactor main body 1a is large, the reactor characteristics are deteriorated. Therefore, it is necessary to uniformly dissipate the reactor main body 1a. In order to provide sufficiently uniform heat dissipation performance, it is necessary to attach the reactor main body 1a in the case 50 with an accuracy of less than 1 mm error in at least the X-axis direction and the Y-axis direction. By using the core fixture 10 according to the embodiment of the present invention and bolting the core 20 to the case 50, high mounting accuracy can be achieved particularly in the X-axis direction and the Y-axis direction, and the heat dissipation characteristics are excellent. A floating structure is realized.

  Further, as shown in FIG. 5, the U-shaped core unit 20a is formed by coating a plurality of core pieces 20c stacked in the X-axis direction via the gap member 30 with resin by insert molding. Directional dimensional accuracy is relatively low. Since the core 20 is formed by overlapping such a U-shaped core unit 20a in the X-axis direction via the gap member 30, the dimensional accuracy in the X-axis direction is, for example, compared with the dimensional accuracy in the Y-axis direction. Remarkably low. The amplitude of thermal expansion and vibration of the core 20 is also largest in the X-axis direction. As described above, the core fixture 10 is flexible with respect to displacement in all directions (particularly in the X-axis direction) of the relative positions between the respective fixed portions, and thus allows the core 20 to have a dimensional error. Can be accurately positioned. In addition, since the core fixture 10 that supports the core 20 functions as a spring having a low spring constant (that is, having a low natural frequency), vibration having a high frequency that is higher than the audible range generated in the core 20 is transmitted to the case 50. This makes it difficult to reduce the noise generated by the reactor 1. In addition, the core fixing tool 10 has a longer portion for connecting the fixing portions than the conventional stay, and the vibration propagation rate from the core 20 to the case 50 is long.

  Further, the core fixture 10 of the present embodiment is configured such that only the core fixing portion 12 is in contact with the core 20 and the case fixing portion 11 and the arm 13 are not in contact with the core 20. As a result, the length of the path through which the vibration propagates from the core 20 to the case 50 can be increased, and the vibration reducing action by the arm 13 can be increased. Moreover, since the effective length (spring length) of the arm 13 that functions as a spring that supports the core 20 can be increased by this configuration, a low natural frequency of the arm 13 is ensured, which causes noise. Propagation of frequency vibration to the case 50 is effectively suppressed.

  FIG. 5 is a cross-sectional view passing through the central axis of a set of nuts 22 arranged in the X-axis direction across the core 20 among the four nuts 22 with which the core 20 is bolted to the core fixture 10. As shown in FIG. 5, the core piece 20 c and the spacer member 30 are arranged without a gap on a line segment L connecting the centers of the set of nuts 22. Therefore, most of the force in the X-axis direction applied from the core fixture 10 to the core 20 via each nut 22 is transmitted as it is along the straight line L as a compressive force or tensile force. No strong shearing force is generated. Therefore, even if a dust core having a low shear strength is used, the core 20 is not cracked by the force received from the core fixture 10. If a set of nuts 22 arranged in the X-axis direction is provided at the center of the core 20 in the Y-axis direction, a region where the core 20 does not exist appears on a line segment connecting the centers of the set of nuts 22. . In such a structure, when the core fixture 10 applies a force in the X-axis direction to the core via the nut 22, a strong shear stress is applied to the core 20. Not suitable for.

  Next, the arrangement of the bus bars 81 and 82 of the terminal block 80 and the lead portions 41 and 42 of the coil 40 will be described with reference to FIGS. FIG. 7 is a diagram (XY plan view) schematically showing an arrangement relationship between the bus bar 81 of the terminal block 80 and the lead portion 41 of the coil 40 in the present embodiment. FIG. 8 is a diagram (ZX plan view) showing the positional relationship between bus bars 81a and lead portions 41a according to another embodiment of the present invention. In a conventional leaf spring type core fixture, there is a certain variation in the spring constant. Therefore, for example, in a configuration in which the core is clamped from both sides in the X-axis direction by a conventional leaf spring type core fixture, the core (and the coil fixed to the core) are caused by imbalance of the load applied to the core by each core fixture. ) In the X-axis direction is away from the original design position. Therefore, as shown in FIG. 8, when adopting a structure in which the tip portion for welding the bus bar 81 a and the lead portion 41 a is bent in the direction perpendicular to the X-axis direction (Z-axis direction in the example of FIG. 8), For example, when the position of the core moves away from the design position in the positive direction in the X-axis direction, the lead portion 41a is arranged at a position indicated by a broken line. In this case, since the lead part 41a cannot contact the bus bar 81a, both cannot be welded. Therefore, when a conventional leaf spring type core fixture is used, a configuration in which the tip end portion where the bus bar 81 and the lead 41 are welded extends in the X-axis direction as shown in FIG. Did not get. On the other hand, when the core 20 is attached to the case 50 using the core fixture 10 according to the embodiment of the present invention, the core fixture 10 does not apply a force in the X-axis direction to the core 20. Even if the spring constants of 10 are different, the position of the core does not greatly deviate from the design position. Therefore, when the core fixture 10 is used, a configuration in which the welded portion between the lead portion 41a and the bus bar 81a is extended in a direction perpendicular to the X-axis direction as shown in FIG. Can be obtained.

  Further, as shown in FIG. 3, the core fixture 10 of the present embodiment has a simple structure including only a case fixing portion 11, a pair of core fixing portions 12 and an arm 13, and has a predetermined shape. Since the metal plate punched in is bent by 90 degrees in a fixed direction at four locations, it can be manufactured at low cost. In addition, since the core can be mounted in the case 50 with a relatively high positional accuracy by simply bolting the three locations for one core fixing tool 10 in total, the processing cost required for assembling the reactor 1 is also reduced. can do. Further, since the core fixture 10 is normally attached without applying a load, it is not necessary to calculate a strict load balance at the time of designing, and excessive labor and time are not required for designing. Moreover, since it is not necessary to tighten the dimensional accuracy of the core fixture 10 in order to ensure the load balance, the core fixture 10 can also be manufactured at low cost.

  The above is the description of the exemplary embodiments of the present invention. Embodiments of the present invention are not limited to those described above, and can be arbitrarily changed within the scope of the technical idea expressed by the description of the scope of claims.

  For example, the core fixture 10 in the above embodiment has two core fixing parts (121, 122), one case fixing part (11), and two arms (131, 132). The number of each part is not limited to this, and can be any number of 1 or more. For example, in another embodiment, the core fixture 10 may have one core fixing part and two case fixing parts. Further, the case fixing part 11 and / or the core fixing part 12 may have a plurality of through holes 11h and / or 12h. However, when a material having low shear strength such as a dust core is used for the core, the corresponding core fixing portion 12 (specifically, the through-hole 12h) of each core fixing tool 10 facing the core 20 with the core 20 is not used. It is desirable to provide the core piece 20c and the spacer member 30 on the straight line L connecting the centers so as to be arranged without a gap.

  Further, the arrangement relationship of each part of the core fixture 10 is not limited to the configuration of the above embodiment. For example, in the above embodiment, the core fixing portion 12 is disposed at a position lower than the case fixing portion 11, but the core fixing portion may be disposed at a position higher than the case fixing portion 11. In the above embodiment, the case fixing part 11 is arranged on the inner side in the Y-axis direction, and the core fixing part 12 is arranged on the outer side in the Y-axis direction. For example, the core fixing part is arranged on the inner side in the Y-axis direction. And you may arrange | position a case fixing | fixed part to the Y-axis direction outer side. In the above embodiment, the case fixing part and the core fixing part are formed with through holes for bolting, but the through holes may be round holes or long holes, and a part of the edge of the through hole is opened. It is good also as a tip open shape which formed the U-shaped groove | channel.

  Moreover, in said embodiment, although the arm 13 connects the back side (core side) of the case fixing part 11 and the core fixing part 12, the arm 13 connects the front side of the case fixing part 11 and the core fixing part 12. You may make it a structure and you may make it the structure which connects one front side of the case fixing | fixed part 11 and the core fixing | fixed part 12, and the other back side. Moreover, the arm 13 is good also as a structure which does not connect the edge of the back side or the front side of the case fixing | fixed part 11 and the core fixing | fixed part 12, but connects the right and left edges of each part. For example, the left arm 131 connects the left side edge of the case fixing part 11 and the right side edge of the left core fixing part 121, and the right arm 132 connects the right side edge of the case fixing part 11 and the right core fixing part 122. You may connect with the left edge of.

  In the above embodiment, the lead portions 41 and 42 of the coil 40 are formed so as to extend in the X-axis direction after assembly, but the extension direction of the lead portion can be set to an arbitrary direction. Moreover, although the ring core is used in the above embodiment, a core having another shape such as an I-type core or an E-type core may be used. Moreover, although embodiment and modification which were demonstrated above are examples which applied this invention to the reactor, this invention is applicable also to another kind of coil apparatuses, such as a transformer, for example.

DESCRIPTION OF SYMBOLS 1 Reactor 10 Core fixing tool 11 Case fixing | fixed part 11a Recessed part 11h Through hole 12 Core fixed part 121 Left core fixing part 122 Right core fixing part 121h, 122h Through hole 121a, 122a Recessed part 13 Arm 131 Left arm 132 Right arm 13a, 13b Curved surface 20 core 20a U-shaped core unit 20c core piece 21 bracket 211 left bracket 212 right bracket 22 nut 23 fixing surface 24a, 24b engagement protrusion 24c, 24d engagement recess 30 gap member 40 coil 41, 42 lead portion 50 case 60, 70 Bolt 80 Terminal block 81, 82 Bus bar 90 Filler

Claims (12)

A core fixture for fixing the coil device core to the case so as not to contact the case ;
A case fixing portion fixed with a bolt to the case;
A core fixing part fixed to the core with a bolt;
An arm for connecting the core fixing part and the case fixing part;
The arm portion is formed with a narrower width than the core fixing portion and the case fixing portion, and is elastically deformable so that a relative position between the core fixing portion and the case fixing portion is changed. Ingredients. 2. The core fixture according to claim 1, wherein the core fixing part and the case fixing part are formed with a concave portion having a curved outline in the vicinity of a base of the arm part. The core fixing part and the case fixing part are arranged on a plane parallel to the XY plane,
The core fixing part is formed with a first through hole through which a bolt passes,
A second through hole through which the bolt passes is formed in the case fixing portion,
In a projection view to a plane the core fixing portion is disposed, the core fixing member according to claim 1 or claim 2, characterized in that said first through hole and the second through-hole do not overlap . The core fixture is formed by sheet metal processing from a single metal plate,
One case fixing portion disposed on a first plane parallel to the XY plane;
A left core fixing portion and a right core fixing portion which are the two core fixing portions disposed on a second plane parallel to the XY plane;
A left arm portion and a right arm portion which are the two arm portions;
When the positive direction in the X axis direction is the front side, the negative direction in the X axis direction is the back side, the positive direction in the Y axis direction is on the left side, and the negative direction in the Y axis direction is on the right side,
The left arm part connects the left end of the back side edge of the case fixing part and the right end of the back side edge of the left core fixing part,
The right arm portion, one of claims 1, characterized in that connecting the left end of the rear side of the edge of the right end and the right core fixing portion of the rear side of edge of the case fixing portion according to claim 3 The core fixture according to claim 1. The said coil apparatus is a reactor, The core fixing tool as described in any one of Claims 1-4 characterized by the above-mentioned. A coil device in which a coil having a core disposed therein is accommodated in a case,
A coil device, wherein both ends of the core are fixed to the case by the core fixing tool according to any one of claims 1 to 4 . 7. The core according to claim 6 , wherein the core is a split core in which the plurality of core pieces are stacked in one direction and fixed integrally, and the core fixing tool is attached to both ends of the core in the stacking direction. Coil device. The core includes a pair of nuts disposed at both ends of the core in the stacking direction, the core fixing portions being fixed with bolts,
The coil device according to claim 7 , wherein the core is continuously formed between the pair of nuts. The coil device according to claim 8 , wherein the core is a dust core. The coil device according to any one of claims 6 to 9 , wherein the core fixture is configured to contact the core only by the core fixing portion. A terminal block;
In place of welding the lead portion of the coil and the terminal base of the bus bar, the bus bar and the lead portion to any one of claims 10 claim 6, characterized in that extending in the direction connecting the both ends of the core one The coil device according to item. Coil apparatus according to any one of claims 11 claim 6, characterized in that the reactor.

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