JP2014053335A - Reactor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sensor mounting structure in which mounting is facilitated and detection accuracy is also improved.SOLUTION: A center leg 11a of a core is disposed in a central portion of a reactor, tubular bobbins 20a, 20b are mounted to the center leg 11a, and a coil 30 is wound around the outer circumferences of the bobbins 20a, 20b. On outer circumferential surfaces of coil wound portions 21a, 21b in the bobbins, temperature sensor mounting recesses 25a, 25b extending in an axial direction of the coil are formed. End face plates 22a, 22b are integrally formed in end portions of the bobbins, and insertion holes 26a, 26b inclined in an axial direction of the recesses are formed on the end face plates. Lock parts 27a, 27b are formed in a portion of edges of the insertion holes. A temperature sensor 60 mounted into the recesses 25a, 25b is positioned by an inner circumferential surface of the coil 30 wound around the outer circumferences of the bobbins and the lock parts 27a, 27b.

Description

  The present invention relates to a magnetic core and a reactor formed by winding a coil around the magnetic core, and more particularly, to a technique in which a temperature sensor such as a thermistor is disposed close to the core and the coil.

  A reactor in which a coil is wound around the left and right legs of a magnetic core is also called a core coil, and has a higher inductance than an air-core (air-core coil) that does not have a core. Therefore, it has been widely used for applications such as filters, boost chokes, or power factor correction.

  As a reactor used in an in-vehicle booster circuit, a reactor part in which a coil is formed by winding a coil around a resin bobbin arranged around the core is made of metal to dissipate heat generated from the coil and the core. After being housed in this case, a material in which a filler is poured into the case and hardened is often used (for example, see Patent Document 1).

  In this type of reactor, if a high current continues to flow, the coil will overheat and exceed the heat resistance temperature of the component parts, so the internal temperature is measured by a temperature sensor such as a thermistor, and the coil and core generate heat above a certain temperature. Energization control is performed so as not to occur.

  When arranging a temperature sensor in a reactor, in order to perform accurate temperature detection, it is necessary to arrange a temperature sensor in the vicinity of a coil or a core serving as a heating element. Therefore, in a reactor in which coils are wound around the left and right legs of the core, a configuration in which a temperature sensor is disposed between the left and right coils as in Patent Document 1 and Patent Document 2 has been conventionally employed. According to this prior art, since the temperature sensor can be arranged in the central portion of the reactor, this type of reactor has the advantage of excellent temperature detection accuracy.

JP 2008-98209 A JP 2010-203998 A JP 2010-186766 A

  In the reactor, as described in Patent Document 2 and Patent Document 3, the entire coil has a rectangular frame shape, and in addition to the coils wound around the left and right legs, respectively, A combination of split cores to form three legs is also known. In the reactor having these three legs, a coil is wound around only the central leg or all three legs.

  In such a reactor having three legs, a central leg and a coil are present at the central portion thereof, and therefore it is difficult to arrange a temperature sensor at the central portion of the reactor by means such as magnetism. Therefore, the temperature sensor must be arranged avoiding the center leg of the core and the coil wound around it, and the position of the sensor is biased or away from the heat generating part, and the temperature detection cannot be performed accurately. there were.

  This type of problem is not limited to temperature sensors, but is also applicable to sensors that detect other states of the reactor, and it has been difficult to arrange various sensors in the vicinity of the coil or core in the prior art. .

  The present invention has been proposed to solve the above-described problems of the prior art. That is, an object of the present invention is to provide a sensor arrangement structure in which a core and a coil are arranged in a central portion, and the temperature and the like of that portion can be detected with high accuracy.

The reactor of 1st invention has the following characteristics.
(1) A cylindrical bobbin is attached to the leg portion of the core of the reactor, and a coil is wound around the outer periphery of the bobbin.
(2) The coil winding portion of the bobbin is formed with a sensor mounting recess extending in the axial direction of the coil.
(3) The sensor mounted in the recess is positioned in the recess by at least one of the inner peripheral surface of the coil wound around the outer periphery of the bobbin and the outer peripheral surface of the core inserted inside the bobbin. Yes.

The reactor of the second invention has the following characteristics.
(1) A core leg is disposed at the center of the reactor, a cylindrical bobbin is mounted on the leg, and a coil is wound around the outer periphery of the bobbin.
(2) A sensor mounting recess that extends in the axial direction of the coil is formed on the outer peripheral surface of the coil winding portion of the bobbin.
(3) The sensor mounted in the recess is pressed by the inner peripheral surface of the coil wound around the outer periphery of the bobbin so as not to jump out from the recess toward the outer periphery of the bobbin.

In each of the above inventions, it is desirable to adopt the following configuration.
(4) An end plate protruding from the surface of the winding part is integrally formed at the end of the coil winding part in the bobbin.
(5) The end face plate is formed with an insertion hole penetrating from the outer surface toward the opening at one end of the recess from a direction inclined with respect to the axial direction of the recess.
(6) The insertion hole has a size that allows the sensor to be inserted, and a locking portion that overlaps a cross section perpendicular to the axial direction of the recess is formed at a part of the edge.
(7) The sensor mounted in the concave portion is positioned in the axial direction of the concave portion by engaging an end portion of the sensor with a locking portion provided at an edge of the insertion hole.

  In the present invention, the sensor can be mounted between the core and the coil by providing a recess in the outer periphery of the coil winding bobbin mounted on the outer periphery of the core and mounting the sensor in the recess. As a result, the temperature of the reactor can be detected with high accuracy.

The perspective view of the reactor of 1st Embodiment. The perspective view which decomposes | disassembles and shows a part of core and bobbin in the reactor of 1st Embodiment, and a temperature sensor part. The perspective view which decomposes | disassembles and shows all the core, the bobbin, and temperature sensor part in the reactor of 1st Embodiment. The perspective view which shows one of the division | segmentation bobbins in 1st Embodiment. The perspective view which shows the state which mounted | wore the temperature sensor with respect to the division | segmentation bobbin of 1st Embodiment. Sectional drawing which shows sequentially the process of mounting | wearing a reactor with a temperature sensor in 1st Embodiment.

[1. First Embodiment]
[1-1. Constitution]
As shown in FIGS. 1 to 4, the reactor according to the present embodiment includes a core formed by combining two E-shaped split cores 10 a and 10 b and two split bobbins attached to the center legs 11 a and 11 b of the core. 20a and 20b, and a coil 30 mounted on the outer periphery of the divided bobbins 20a and 20b.

  In the present embodiment, the two reactors R1 and R2 are housed in the case 40 so that the directions of the legs are the same. The gap between the case 40 and the two reactors R1, R2 is filled with an insulating resin 50.

  Temperature sensors 60 are respectively disposed between the bobbins 20a and 20b and the coils 30 in the two reactors R1 and R2. The temperature sensor 60 has a cylindrical bar shape as a whole, and a lead 61 is connected to one end thereof. An external connection connector 62 is provided at the end of the lead 61.

  Resin holding members 31a and 31b are fixed to the outside of the case 40, and between the windings of the two reactors are electrically connected by energizing bars 32a and 32b molded on the holding members 31a and 31b. ing. The energization bars 32a and 32b are connected to terminals 33a and 33b molded on the holding members 31a and 31b, and the terminals 33a and 33b are connected to a power supply and other circuits provided outside the reactors R1 and R2.

  As shown in the exploded perspective views of FIGS. 2 and 3, in this embodiment, the cores of the reactors R <b> 1 and R <b> 2 are two E-shaped split cores 10 a and 10 b that are butted against the three legs. As shown in FIG. In this case, a sheet-like or plate-like spacer (not shown) for gap formation is sandwiched between the opposing surfaces of the two 10a and 10b.

  Each of the divided bobbins 20a and 20b mounted on the outer periphery of the center legs 11a and 11b includes cylindrical coil winding portions 21a and 21b, and end face plates 22a and 22b provided at one end thereof. Yes. The center legs 11a and 11b of the split cores 10a and 10b are inserted into the coil winding portions 21a and 21b. Therefore, the inner circumferences of the coil winding portions 21a and 21b are in the shape of the center legs 11a and 11b. It is a square along.

  Locking members 23 and 24 for fixing the divided cores 20a and 20b so as not to come off when the divided cores 20a and 20b are combined are provided at the contact portions of the divided bobbins 20a and 20b with the opposing bobbins. In the present embodiment, one locking member 23 is a tongue piece protruding from the edge of the coil winding portions 21a and 21b toward the other split core, and the other locking member 24 is a coil winding portion. It is a recessed part formed in the surface of 21a, 21b, and the said tongue-shaped locking member 23 fits.

  Groove-shaped recesses 25a and 25b extending along the axial direction of the coil are provided on the upper surfaces of the coil winding portions 21a and 21b. The groove-like recesses 25a and 25b are portions for mounting the temperature sensor 60 having a round bar shape in this embodiment, and have a U-shaped cross section having a dimension corresponding to the outer shape of the temperature sensor 60. The width of the opening above the recesses 25a and 25b is larger than the width of the temperature sensor 60, and is a dimension that allows the temperature sensor 60 to be fitted into the recesses 25a and 25b from above.

  The ends of the concave portions 25a and 25b on the side of the opposed divided bobbins are exposed in a U-shaped cross-sectional shape, and the concave portions 25a and 25b of the opposed divided bobbins 21a and 21b continuously form one groove-shaped concave portion. To do. On the other hand, insertion holes 26a and 26b penetrating from the outer surfaces of the end surface plates 22a and 22b toward the recesses 25a and 25b are provided at the end portions of the recesses 25a and 25b on the end surface plates 22a and 22b side.

  The insertion holes 26a and 26b are provided in a direction inclined with respect to the axial direction of the recesses 25a and 25b (in this embodiment, obliquely upward from below the reactor). The insertion holes 26a and 26b have a size that allows the temperature sensor 60 to be inserted, and locking portions 27a and 27b that overlap with the U-shaped cross sections of the recesses 25a and 25b are formed in part of the edges (FIG. 6). reference). The locking portions 27a and 27b engage with the end portions of the temperature sensor 60 mounted in the recesses 25a and 25b.

  Brackets 28a and 28b projecting in the horizontal direction toward the outside of the reactor are integrally formed on the upper portions of the two end face plates 22a and 22b provided to face each other. Screw insertion holes 29 are provided at both ends of the bracket 28a located outside the case. A set screw 41 is inserted into the screw insertion hole 29. By tightening the tip of the set screw 41 to the corner portion of the case 40, the divided bobbins 20a positioned outside the case 40 of the two reactors R1 and R2 are It is fixed to the case 40.

  In the divided bobbins 20b located inside the case 40 of the two reactors R1 and R2, a bracket 28b formed on the end face plate 22b extends to the upper edge of the case 40. An elongated plate-shaped stopper 42 extending along the edge of the case 40 is superposed on the upper portion of the extended portion of the bracket 28b. By fastening the stopper 42 to the case 40 with a set screw 41, a divided bobbin is provided. 20 b is fixed to the case 40.

  A locking portion 63 for fixing the connector 62 of the temperature sensor 60 is provided on the split bobbin 20b inside the case in one of the reactors R1 and R2. The locking portion 63 is formed integrally with the bracket 28b and engages with a hook portion 64 provided on the bottom of the connector 62, thereby fixing the connector 62 to the divided bobbin 20b.

[1-2. Action]
In order to assemble the reactor of this embodiment having such a configuration, first, as shown in FIG. 5, the temperature sensor 60 is mounted in the recessed portion 25 b of one divided bobbin 20 b positioned inside the case 40. This mounting process is shown in FIGS.

  6 (a) to 6 (d) also show the divided bobbin 20a on the opposite side, the two divided bobbins 20a and 20b are integrated after the coil 30 is mounted on the outside of the bobbin. It is. In these drawings, the divided bobbin 20a on the opposite side is shown for comparison with FIG. 6 (e) showing the state after the coil 30 is mounted.

  In order to mount the temperature sensor 60 in the recess 25b, as shown in FIG. 6A, the tip of the temperature sensor 60 is inserted from an insertion hole 26b provided in a direction inclined with respect to the axial direction of the recess 25b. Is inserted toward the recess 25b. Next, as shown in FIGS. 6B and 6C, the tip of the temperature sensor 60 inserted to the inside of the end face plate 22b is tilted, and the temperature sensor 60 is fitted into the recess 25b.

  In this way, as shown in FIG. 6D, the temperature sensor 60 is set in the recess 25b, and at the same time, the end of the temperature sensor 60 on the lead 61 side protrudes to the edge of the insertion hole 26b. Engages with the locking portion 27b. As a result, the temperature sensor 60 is positioned in the axial direction in the recess 25b without coming out of the insertion hole 26b.

  After setting the temperature sensor 60 on one divided bobbin 20b, the coil 30 is fitted on the outer periphery of the coil winding portion 21b of the divided bobbin 20b, and the other divided bobbin 20a is inserted into the coil 30 from the opposite side. The divided bobbins 20a and 20b are integrated by abutting the tips of the two divided bobbins 20a and 20b and fitting the locking portions 23 and 24 together.

  When the other divided bobbin 20a is inserted into the coil 30 from the opposite side, the tip of the temperature sensor 60 already set in the concave portion 25b of the one divided bobbin 20b is connected to the end of the concave portion 25a of the opposite divided bobbin 20a. Insert into the part. Thereby, even if the temperature sensor 60 is longer than the coil winding part 21b of one division | segmentation bobbin 20b, it can be accommodated in the recessed part 25a, 25b of the two division | segmentation bobbin 20a, 20b combined.

  When the coil 30 is set on the divided bobbins 20a and 20b in this way, the temperature sensor 60 set in the recesses 25a and 25b has an inner peripheral surface of the coil 30 from above as shown in FIG. 6 (e). Will not be lifted from the top openings of the recesses 25a, 25b.

  Thereafter, from both sides of the divided bobbins 20a and 20b, the center legs 11a and 11b of the divided cores 10a and 10b are inserted inside the coil winding portions 21a and 21b, and the tips of the cores are abutted with each other via a spacer. A reactor in which a coil is wound around the outer periphery is constructed.

  After the second reactor is assembled in the same manner, the two reactors R1 and R2 are accommodated in the case 40, and the brackets 28a and 28b of the divided bobbin are attached to the case 40 by using the set screw 41 and the set metal fitting 42. Secure to. Thereafter, the gap between the reactors R1 and R2 and the case 40 is filled with the resin 50, and the energization bars 32a and 32b are connected to the coil 30 to complete the reactor.

[1-3. effect]
The reactor of the present embodiment is provided with recesses 25a and 25b on the outer periphery of the coil winding split bobbins 20a and 20b to be mounted on the outer periphery of the core, and the temperature sensor 60 is mounted in the recesses 25a and 25b. A temperature sensor 60 can be mounted between the coil and the coil. As a result, the temperature of the reactor can be detected with high accuracy.

  In particular, in a reactor in which a coil is wound around a central leg by providing a recess on the outer periphery of the coil winding split bobbins 20a and 20b to be mounted on the outer periphery of the core, and mounting the temperature sensor 60 in the recess A temperature sensor 60 can be mounted between the center legs 11 a and 11 b and the coil 30. As a result, it becomes possible to accurately detect the temperature at the center of the reactor.

  Further, since the insertion holes 26a and 26b of the temperature sensor 60 are provided so as to be inclined with respect to the axial direction of the recesses 25a and 25b, the temperature sensor 60 is obliquely inserted into the recesses 25a and 25b through the insertion holes 26a and 26b. be able to. After the temperature sensor 60 inserted obliquely into the recesses 25a and 25b is set in the recesses 25a and 25b in parallel with the axial direction, the locking portions 27a and 27b formed at the edges of the insertion holes 26a and 26b are used. Since the temperature sensor 60 is prevented from being pulled out, the temperature sensor 60 is reliably positioned with respect to the axial direction of the recesses 25a and 25b.

  As a result, the temperature sensor 60 mounted in the recesses 25a and 25b is pressed by the coil 30 on the outer periphery of the bobbin and is not likely to jump out of the recesses 25a and 25b. Since the positioning is performed by the locking portions 27a and 27b, the temperature sensor 60 can be reliably held in both the outer circumferential direction and the axial direction of the coil 30.

  Furthermore, since the core center legs 11a and 11b are inserted inside the coil winding portions 21a and 21b of the bobbin, the temperature sensor 60 set in the recesses 25a and 25b is supported by the core. The positioning of the bottoms of the recesses 25a and 25b is also reliable.

[2. Other Embodiments]
The present invention is not limited to the above embodiment, and includes other embodiments as described below.

(1) In this specification, up, down, left and right are directions given for convenience in order to make the positional relationship between the members easy to understand, and do not limit the arrangement direction of the members. When the actual reactor is used, it is naturally arranged in various directions.

(2) As a material constituting the magnetic core, ferrite and ferrite, ferrite and sendust, FeSi-based dust core, and a combination of dust core and dust core can be used. A reactor having the following reactor characteristics can be obtained.

(3) In the above embodiment, two E-shaped split cores are used. However, even if one E-shaped core having three long legs and one I-shaped yoke are combined, two E-shaped split cores are used. It is also possible to configure the core by combining an I-shaped yoke and three I-shaped legs.

(4) The present invention is not limited to a reactor having three legs, but can be applied to a reactor having two legs as described in the prior art. In that case, it is possible to detect the temperature of each coil by providing recesses in the bobbins of the coils wound around the two leg portions and mounting a temperature sensor in each recess.

(5) In the illustrated embodiment, the end face plate of the bobbin is provided with a locking portion, and the temperature sensor is axially positioned in the recess. However, the axial positioning means is not limited to such a configuration. For example, the bobbin and the temperature sensor may be fixed with an adhesive or an adhesive tape, or positioning may be performed by providing a protrusion that engages with the temperature sensor on the inner surface of the recess.

(6) In the illustrated embodiment, the temperature sensor is inserted into the recess from the insertion hole provided in the end surface plate of the bobbin, but instead of the insertion hole, a groove portion having an open upper end is formed in the end surface plate of the bobbin. The temperature sensor can be fitted into the recess from above by passing the lead through the groove. Even when the insertion hole is provided, it may be provided only on one of the split cores, and the end of the concave portion of the other split core may be closed by the surface of the end face plate.

(7) It is not necessary to provide the temperature sensor mounting recesses on both of the divided bobbins, and may be provided only on one of the divided cores depending on the size of the temperature sensor. Further, the present invention can be applied to a reactor in which one bobbin is mounted on the outer periphery of the core, instead of the divided bobbin.

(8) In the illustrated embodiment, two reactors are mounted in one case, but the number of reactors mounted in the case may be one, or a plurality of three or more. However, when using two reactors as a set, it is desirable to draw out the leads of the temperature sensors of the reactors on the opposing surfaces of the two reactors as in the illustrated embodiment. Of course, the present invention includes a configuration in which the leads are drawn out of the two reactors instead of the facing surfaces.

(9) In the illustrated embodiment, a gap-forming spacer is sandwiched between the opposing surfaces of the legs, but this spacer may not be provided. Further, by providing a difference in the length of each leg portion, it is possible to form an air gap between the opposing surfaces of the leg portions, or to interpose an adhesive instead of the spacer.

(10) In addition to the temperature sensor, the present invention can be applied even when other types of sensors such as a vibration sensor and a magnetic sensor are arranged in the reactor.

R1, R2 ... reactors 10a, 10b ... split cores 11a, 11b ... center legs 20a, 20b ... split bobbins 21a, 21b ... coil winding portions 22a, 22b ... end plates 23, 24 ... locking members 25a, 25b ... temperature sensors Mounting recesses 26a, 26b ... insertion holes 27a, 27b ... locking portions 28a, 28b ... brackets 29 ... screw insertion holes 30 ... coils 31a, 31b ... holding members 32a, 32b ... energizing bars 33a, 33b ... terminals 40 ... cases 41 ... Set screw 50 ... Resin 60 ... Temperature sensor 61 ... Lead 62 ... Connector

Claims (7)

In a reactor in which a cylindrical bobbin is attached to the leg of the reactor core and a coil is wound around the outer periphery of the bobbin,
The coil winding part in the bobbin is formed with a sensor mounting recess extending in the axial direction of the coil,
The sensor mounted in the recess is positioned in the recess by at least one of the inner peripheral surface of the coil wound around the outer periphery of the bobbin and the outer peripheral surface of the core inserted inside the bobbin. Characteristic reactor. In the reactor in which the core leg portion is arranged at the center portion of the reactor, a cylindrical bobbin is mounted on the leg portion, and a coil is wound around the outer periphery of the bobbin,
On the outer peripheral surface of the coil winding portion in the bobbin, a sensor mounting recess extending in the axial direction of the coil is formed,
The sensor mounted in the recess is pressed by an inner peripheral surface of a coil wound around the outer periphery of the bobbin so as not to protrude from the recess toward the outer periphery of the bobbin. At the end of the coil winding part in the bobbin, an end face plate protruding from the surface of the winding part is integrally formed,
In the end face plate, an insertion hole penetrating from a direction inclined with respect to the axial direction of the recess is formed from the outer surface toward the opening at one end of the recess.
The insertion hole has a size that allows the sensor to be inserted, and a locking portion that overlaps a cross section perpendicular to the axial direction of the recess is formed at a part of the edge of the insertion hole.
The sensor mounted in the recess is positioned in the axial direction of the recess by engaging an end portion of the sensor with a locking portion provided at an edge of the insertion hole. The reactor according to claim 1 or claim 2.   The core is composed of a center leg and left and right legs by abutting two E-shaped split cores, and a coil is wound around at least the center leg via the bobbin. The reactor of Claim 2 or Claim 3 characterized by these.   The bobbin attached to the outer periphery of the center leg is composed of two divided bobbins attached to the center legs of the two E-shaped split cores, and in the state where the two E-shaped split cores are abutted, The reactor according to claim 4, wherein the split core is abutted to form a cylindrical bobbin on the outer periphery of the center leg.   The two reactors according to any one of claims 2 to 5 are housed in one case so that the center leg of each reactor is in the same direction, and the case and the two reactors Are filled with resin, and the leads of the sensors attached to the reactors are pulled out from the opposing portions of the two reactors, so that the sensors of the reactors are centered on the opposing surfaces of the two reactors. A reactor that is arranged symmetrically.   The reactor according to any one of claims 1 to 6, wherein the sensor is a temperature sensor.