JP2018182183A - Reactor and reactor bobbin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thin-shape reactor of which size in a longitudinal direction is made small and in which a winding wire is wound in the vicinity of a core and a length of the winding wire may also be shortened.SOLUTION: The present invention relates to a reactor 1a comprising: a core 10 including a gap 13 in a middle leg 12; and a coil 20 configured by winding a winding wire 21 with the middle leg defined as a winding shaft. The core includes outer legs 11 extending in a longitudinal direction at both right and left ends of a rectangular and tabular base part 14 which is flat in a vertical direction and defines a lateral direction and the longitudinal direction as faces. The middle leg is formed in a lateral center by extending in the longitudinal direction. The winding wire is wound around the middle leg within a region in which the core is disposed in a view in the vertical direction. The winding wire that is led out of the region of the core in the middle of winding is guided in the lateral direction along front and rear end faces 15 of the base part.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a reactor and a bobbin for the reactor.

  The reactor is a passive element using an inductor, and is used, for example, in a vehicle having a motor drive system such as a hybrid car or an electric car, as a voltage converter for boosting a battery voltage. In addition, noncontact power feeding technology for electrically powered vehicles such as electric vehicles and plug-in hybrid vehicles is being developed, and a reactor is also used in this noncontact power feeding device. In addition, since the electrically powered vehicle capable of external charging charges the battery mounted on itself by the power from the noncontact power feeding device installed under the vehicle, the noncontact power feeding device is required to be thinner. Therefore, a thin reactor (hereinafter, also referred to as a thin reactor) is used for this non-contact power feeding device. Of course, thin reactors are used not only for non-contact power feeding devices for electric vehicles, but also for various thin devices.

  An example of the core 10 of the thin reactor is shown in FIG. The core 10 shown in FIG. 1 is an EE-type core 10 in which E-type cores (10a, 10b) made of two ferrites are disposed to face each other. The two E-shaped cores (10a, 10b) are such that the end faces of the outer leg 11 are in contact with each other, and the end faces of the middle leg 12 face each other with the gap 13. Here, the extension direction of each leg (11, 12), that is, the opposing direction of the two E-shaped cores (10a, 10b) is the vertical direction (or height direction), and each E-shaped core (10a, 10b) The left and right directions are defined as the outer legs 11 are formed symmetrically with respect to the middle leg 12, and the direction perpendicular to the vertical and horizontal directions is the front and rear direction.

  Each leg of the E-shaped core is short, and when viewed from the front and rear direction, a magnetic path which is flat in the vertical direction and wide in the left and right direction is formed. When viewed from the up and down direction, in the rectangular flat plate-like portion (hereinafter also referred to as the base portion), the outer legs are formed along the two opposing sides extending in the front-rear direction, and the middle leg is outer at the middle of the two sides It is formed parallel to the legs.

  FIG. 2 is a view showing a winding state of the winding 21 in the thin-type reactor 101 provided with the core 10 shown in FIG. In the following, as shown in the figure, the directions of upper, lower, front, rear, left, and right are defined for convenience. And FIG. 2 (A) is a top view when the thin-shaped reactor 101 is seen from upper direction, FIG. 2: (B) is an aa arrow directional cross-sectional view in FIG. 2 (A). Moreover, FIG.2 (C) is a rear view when the thin-shaped reactor 101 is seen from back, FIG.2 (D) is bb arrow sectional drawing in FIG. 2 (A). As shown in FIG. 2A, in the thin reactor 101 shown in the figure, the winding start portion 21a of the winding 21 is introduced from the front toward the rear into the area of the core 10 and wound with the middle leg 12 as a winding axis After being turned, the winding end portion 21b is derived from the rear to the front. Also, in this example, a single winding is wound in a spiral around the winding axis to form a single-layer coil 20. Of course, if the winding 21 is thin, two or more layers of coils 20 may be formed. In any case, the winding 21 is wound in the core 10 over the height of the middle leg 12 which is narrow in the vertical direction. The thin reactor is also described in Non-Patent Document 1 below.

Kitagawa Electric Co., Ltd., "thin high-frequency reactor", [online], [search on February 14, 2017], Internet <URL: http://www.kitagawa-denki.co.jp/img/pdf/reactor- flat_type.pdf>

  As described above, since the thin reactor winds the winding around the middle leg of the flat core at the top and bottom, when the winding is thick, the winding is wound around multiple layers in a spiral like a general coil. It is difficult to do. Especially in thin reactors handling large currents (for example, 40A), such as the non-contact power supply described above, a "wire" with a large diameter is used for the winding, and the wire is formed into a single-layer coil with respect to the winding axis It will be wound like a spiral. Therefore, as shown in FIG. 2, the winding is greatly extended in the longitudinal direction of the core. That is, the size of the conventional thin-type reactor increases in size in the front-rear direction in exchange for thinning in the vertical direction. Further, there is a problem in that the inductance value is reduced because the windings protruding to the front and back of the core are far from the region where the core is disposed. Furthermore, if the number of turns is the same, the length of the spirally wound winding is longer than that of the spirally wound winding, and the DC resistance also increases.

  Then, this invention aims at providing the bobbin used for the thin reactor in which the size of the front-back direction is small, the winding is wound in the vicinity of the core, and the length of the winding can be shortened. There is.

One aspect of the present invention to achieve the above object is a reactor including a core having a gap in an intermediate leg, and a coil formed by winding a winding with the intermediate leg as a winding axis,
The core is flat in the vertical direction, and has outer legs extending in the front and rear direction at the left and right ends of a rectangular flat base having a horizontal direction and the front and rear direction, and the middle leg is in the front and rear direction in the horizontal center It is extended and formed,
The winding is wound around the middle leg in a region where the core is disposed, as viewed from the upper and lower direction, and a winding drawn out of the region of the core from the middle of winding is the winding. It is guided in the lateral direction along the front and rear end faces of the base portion,
The reactor is characterized by

In addition, it has a flat box shape in the upper and lower sides, and a bobbin formed by connecting the upper and lower surfaces and through which the middle leg of the core is inserted,
The bobbin has grooves formed on the left and right sides with bottom surfaces on the left and right sides of the hole as bottom surfaces, and also includes guide portions for guiding the winding in the left and right directions at predetermined vertical positions on both front and rear surfaces.
The guide portion is a first guide portion for guiding the winding in a range of predetermined lateral width at the upper and lower positions between the upper end and the lower end of the middle leg, and the front and rear end surfaces of the base portion of the core And a second guide portion for guiding the winding over the lateral width of the bobbin at corresponding upper and lower positions, the winding being wound along the groove and the first guide portion from the winding start After being turned, it is wound along the second guide portion along the front and rear end faces of the upper base portion of the core and along the front and rear end faces of the lower base portion.
It can also be set as the reactor characterized by the above.

The first guide portion is constituted by a pair of tongue pieces which have a predetermined lateral width, project in the front-rear direction, and face in the vertical direction.
The second guide portion has a normal in the front-rear direction, extends in the left-right direction, and is in contact with the front and rear end faces of the base portion of the core, and from the upper edge and the lower edge of the wall forward It has a pair of upper and lower guide plates that project like a bowl,
The second guide portion is configured by the upper guide plate and the upper tongue piece, and the lower guide plate and the lower tongue piece.
It is good also as a reactor characterized by the above.

Furthermore, the bobbin holds a winding start portion of the winding and introduces the winding into the groove, and a winding end portion of the winding holds the winding outward. And a winding lead-out portion for leading in a predetermined direction of
The winding introduction portion is formed on any one of the front and rear guide portions, and includes a guide plate which constitutes a pair of upper and lower second guide portions and a notch formed at a predetermined left and right position of the tongue piece.
The winding lead-out portion is formed on any one of the front and rear guide portions, and includes a notch formed on the upper or lower guide plate.
It can also be set as the reactor characterized by the above.

In the reactor described in any of the above,
The winding comprises two or more windings connected in parallel, and each of the two or more windings maintains the inner and outer circumferential sides at the upper and lower center positions. The inner circumferential side and the outer circumferential side are interchanged on the way of being guided by the second guide portion so that the total extension of the two or more plurality of windings becomes equal after being turned,
It can also be set as the reactor characterized by the above.

A bobbin for a reactor comprising a core having a gap in the middle leg and a coil formed by winding a winding with the middle leg as a winding shaft is also within the scope of the present invention, and the bobbin is
It is a flat box shape up and down, extending in the front and back direction while connecting both the upper and lower sides, a hole through which the middle leg of the core is inserted, and a groove formed on the left and right side surfaces And a guide portion for guiding the winding in the left and right directions at predetermined vertical positions on both front and rear sides,
The guide portion is a first guide portion for guiding the winding in a range of predetermined lateral width at the upper and lower positions between the upper end and the lower end of the middle leg, and the front and rear end surfaces of the base portion of the core And a second guide for guiding the winding over the width of the bobbin at corresponding upper and lower positions.
It is set as the bobbin for reactors characterized by the above.

  The reactor which concerns on this invention can make small the width | variety which a coil protrudes from the arrangement | positioning area | region of a core, and it can achieve size reduction with thickness reduction. Further, since the winding of the coil is wound in the vicinity of the core, it is possible to suppress a decrease in the inductance value. Further, the DC resistance value of the winding can be reduced, and the loss of the reactor can be reduced.

  According to the bobbin for reactor according to the present invention, the winding of the coil in the reactor according to the present invention can be easily wound. In addition, the winding state of the winding can be reliably fixed, the insulation performance between the core and the winding can be strengthened, and the withstand voltage performance can be improved. Other effects will be clarified in the following description.

It is a figure which shows the core used for a thin-shaped reactor. It is a figure which shows the structure of the conventional thin reactor. It is a figure showing the reactor concerning the 1st example of the present invention. It is a figure showing the reactor concerning the 2nd example of the present invention. It is a figure which shows the arrangement | positioning relationship between the bobbin in the reactor which concerns on the said 2nd Example, and a core. It is a perspective view which shows the bobbin with which the reactor which concerns on the said 2nd Example is equipped. It is a three-sided figure which shows the bobbin with which the reactor which concerns on the said 2nd Example is equipped. It is a figure which shows the winding state of the winding in the reactor which concerns on the 3rd Example of this invention. It is a figure which shows the structure of the guide part in the reactor which concerns on the other Example of this invention.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. In the drawings used in the following description, the same or similar parts may be denoted by the same reference numerals and redundant description may be omitted. In the drawings, unnecessary reference numerals may be omitted depending on the drawing.

=== First Example ===
As a reactor which concerns on a 1st Example, the thin-shaped reactor provided with the basic structure common to the reactor which concerns on all the Examples of this invention is mentioned. FIG. 3 shows the structure of the reactor 1a according to the first embodiment. Also in the following drawings including FIG. 3, the directions of upper, lower, front, rear, left, and right defined in FIGS. 1 and 2 are adopted. 3 (A) is a plan view of the reactor 1a of the first embodiment as viewed from above, and FIG. 3 (B) is a cross-sectional view taken along the line cc in FIG. 3 (A). Fig. 3 (C) is a front view of the reactor 1a when viewed from the rear, and Fig. 3 (D) is a cross-sectional view taken along the line d-d in Fig. 3 (A).

  As shown in FIG. 3 (A), reactor 1a is counterclockwise viewed from above as shown by the thick dotted arrow in the figure, similarly to the conventional thin type reactor 101 shown in FIG. A winding 21 is wound around the middle leg 12 of the core 10. However, the coil 20 does not project largely in the front-rear direction with respect to the region in which the core 10 is disposed, and the size in the front-rear direction is smaller than that of the conventional thin-type reactor 101.

  As shown in (B) and (C) of FIG. 3, the reactor according to the first embodiment is wound around the winding 21 only in the upper and lower center region where the middle leg 12 of the core is disposed. There is a portion 21c and portions (21d, 21e) disposed along the front and rear end faces 15 of a rectangular flat plate-like portion (hereinafter also referred to as a base portion 14) connecting the outer leg 11 and the middle leg 12. Referring to FIG. 3C, the portions (21d, 21e) of the winding 21 disposed along the front and rear end faces 15 of the base portion 14 are shown in FIG. It is guided outward along the end face 15 of the base portion 14 after being bent in either the upper or lower direction after being drawn out. Then, after being bent again in the other direction, it is guided to the inside of the core 10 and wound around the middle leg 12 which becomes a winding shaft again. That is, as shown in FIG. 3 (D), in the arrangement area of the core 10, a coil 20 of one layer is formed with the middle leg 12 as a winding axis.

  As described above, according to the reactor 1a of the present embodiment, since the winding 21 has a multi-layered winding structure (three-layer structure in this example) outside the arrangement region of the core 10, the core is different from the conventional thin reactor 101. The protrusion width w of the winding 21 in the front-rear direction outside the arrangement region of 10 becomes short, and the size in the front-rear direction of the reactor 1a can be reduced. In addition, since the winding 21 is wound around the entire area of the core 10 over the entire length, the coupling ratio between the winding 21 and the core 10 is increased, and the leakage flux is reduced. That is, the decrease in the inductance value can be suppressed. Furthermore, since the winding 21 is wound in the vicinity of the region of the core 10, the overall length of the winding 21 is shortened, the resistance value is lowered, and the loss of the coil can be reduced.

=== Second Example ===
The reactor 1a according to the first embodiment of the present invention has a basic structure in which a part of the winding 21 is disposed along the front and rear end faces 15 of the base portion 14 outside the region where the core 10 is disposed. There is. In order to fix the winding 21 at a predetermined upper and lower position outside the arrangement region of the core 10, a tape may be used, or the winding 21 may be molded with a resin or the like. However, it is conceivable to use a bobbin because a complicated process for fixing the winding 21 is separately required. Therefore, as a reactor according to the second embodiment of the present invention, a thin-type reactor provided with a bobbin capable of easily fixing the winding 21 to the front and rear end surfaces 15 of the base portion 14 in the core 10 will be mentioned.

  The perspective view of the reactor 1b which concerns on FIG. 4 at 2nd Example was shown. Two E-shaped cores (10a, 10b) which are flat in the vertical direction are disposed so as to sandwich the bobbin 30 in the vertical direction. Then, the winding start portion 21 a of the winding 21 is introduced into the bobbin 30, and the winding end portion 21 b of the winding 21 is led out of the bobbin 30. A part (21d, 21e) of the winding 21 is guided in the lateral direction along the front and rear end faces 15 of the base portion 14 while being wound around the winding shaft of the bobbin 30. And, at the front and rear end portions of the bobbin 30, when the winding wire 21 is led out of the arrangement region of the core 10 in the middle of winding, a guide for guiding the winding wire 21 in the left and right direction at a predetermined vertical position. The part 40 is formed. Further, in the reactor 1b according to the second embodiment, the winding start portion 21a and the winding end portion 21b of the winding 21 are introduced to the bobbin 30 from predetermined positions in the front guide portion 40a of the bobbin 30, and from the bobbin 30 Notches (47a to 47c) are formed for derivation.

  FIG. 5 is a view showing the arrangement of the bobbin 30 and the core 10 in the reactor 1b according to the second embodiment. The bobbin 30 is in the form of a flat rectangular flat plate, and the bobbin 30 is sandwiched by the flat E-shaped cores (10a, 10b) from the upper side and the lower side. In addition, the core 10 illustrated in FIG. 5 has a front-rear length of about 15 cm and a left-right width of about 10 cm as a whole. And, since it is difficult to integrally mold the core 10 having a flat area of this size, in this example, the E-shaped cores (10a, 10b) disposed above and below the bobbin 30 are respectively back and forth It is divided into four in the direction.

  The structure of the bobbin 30 is shown in FIG. 6 and FIG. FIG. 6A is a perspective view when the bobbin 30 is viewed from the upper left rear, and FIG. 6B is a perspective view when the bobbin 30 is viewed from the upper left front. 7A is a plan view of the bobbin 30 as viewed from above, and FIG. 7B is a rear view of the bobbin 30 as viewed from the rear. FIG. 7C is a side view of the bobbin 30 as viewed from the right. Hereinafter, the specific structure of the reactor 1 which concerns on a 2nd Example is demonstrated, referring FIGS. 4-7.

  As shown in FIG. 6, the bobbin 30 is in the form of a rectangular flat plate that is flat at the top and bottom, and grooves 31 extending in the front-rear direction are formed on the left and right side surfaces. Further, the bobbin 30 is formed with a hole 32 having a strip-like planar shape extending in the front-rear direction to connect the upper surface and the lower surface, and the bobbin 30 is flat E-shaped core (10a, When nipped by 10b), as shown in FIG. 5, the middle leg 12 of the core 10 is inserted into the above hole (hereinafter also referred to as middle leg insertion hole 32). And as shown to (A) and (C) of FIG. 7, the inner surface 33 of the right and left in the middle leg penetration hole 32 and the bottoms 34 of the groove 31 are formed by the common wall part 35, and the relationship of front and back mutually. It has become.

  The guide portion 40 also has a first guide portion 41 for guiding the winding portions (FIGS. 3 and 4, reference numeral 21c) disposed at the upper and lower center positions, and the base portions 14 above and below the core 10, respectively. The second guide portion 42 guides the winding portions (FIGS. 3 and 4, reference numerals 21d and 21e) disposed at positions along the front and rear end surfaces 15 of the second embodiment.

  As shown in FIGS. 5 to 7, the guide portion 40 has a pair of upper and lower guide plates 43 projecting like a hook over the left and right width of the bobbin 30 in the front and rear direction on the front and rear upper and lower end sides of the bobbin 30; A pair of upper and lower guide pieces 44 project like tongues in the front-rear direction from positions corresponding to the upper end and the lower end of the middle leg 12, respectively. The guide plate 43 is formed on the upper edge and the lower edge of the wall surface 37 whose normal direction is the front and rear direction, and the core 10 is formed in the base portion 14 while the middle leg 12 is inserted into the middle leg insertion hole 32. The front and rear end surfaces 15 abut the wall surface 37 so that the bobbin 30 is mounted.

  As shown in (A) and (C) of FIG. 7, the guide piece 44 is formed at the left and right center over a predetermined left and right width. The right and left width of the guide piece 44 is set to be the width when winding the winding 21 of a predetermined thickness around the middle leg insertion hole 32 a predetermined number of times. A groove-shaped gap extending in the left and right direction, which is formed by the pair of guide pieces 44 facing in the vertical direction, is the first guide portion 41. In addition, a groove-shaped gap extending in the left and right direction formed by the upper or lower guide plate 43 and the upper or lower guide piece 44 is the second guide portion 42.

  The winding 21 is wound up to the left-right width of the guide piece 44 while being guided by the first guide portion 41 from the winding start portion 21a. When the winding 21 exceeds the lateral width of the guide piece 44 in the process of winding, the winding 21 is bent upward or downward while being drawn out from the arrangement region 36 of the core 10 and then upward. Alternatively, it is guided by the lower second guide portion 42 and bent downward or upward at the left and right ends of the guide piece 44 and then introduced into the groove 31.

  In the reactor 1b according to the second embodiment, as shown in FIG. 4, the winding 21 is placed in the placement area 36 of the core 10 along the bottom surface 34 of the groove 31 from the upper front at the winding start portion 21a. In the end of winding 21b, it is led from the open end side of the groove 31 on the right side toward the upper front. And as shown in FIG. 4, FIG. 6 (B), and FIG. 7 (A), in the front guide part 40a, it winds by the notch (47a-47c) provided in the guide plate 43a or the guide piece 44a. A winding introduction portion 45 for holding the winding start portion 21a of the wire 21 from the predetermined direction into the groove 31 of the bobbin 30, and the winding end portion 21b of the winding 21 A winding lead-out 46 is formed which holds in a guided manner. Specifically, notches (47a, 47b) are provided at the same left and right positions along the bottom of the groove 31 of the upper guide plate 43a and the upper guide piece 44a in the front guide portion 40a, and this notch (47a, A winding lead-in portion 45 is formed by 47b), and the winding start portion 21a of the winding 21 is held by these notches (47a, 47b).

  Further, a notch 47c is also formed on the right end side of the upper guide plate 43a in the front guide portion 40a, and the notch 47c serves as a winding lead-out portion 46, and the winding end portion 21b of the winding 21 is formed by the notch 47c. It is held. In addition, the reactor 1b is fixing the core 10 to the bobbin 30 using a tape, an exterior case for exclusive use, etc., when it incorporates in various apparatuses (non-contact charger etc.) and is actually used. In addition, the surplus space in the groove 31 is filled with a buffer material, a resin or the like to fix the winding in the correct winding state more firmly. Also, the insulation performance between the core and the winding can be enhanced.

  Thus, in the reactor 1b according to the second embodiment, by providing the above-described bobbin 30, the winding 21 protruding in the front-rear direction with respect to the core 10 can be located at the upper and lower center positions corresponding to the middle leg 12; While being smoothly guided to the positions on the upper and lower end sides corresponding to the front and rear end faces 15 of the base portion 14, the base portion 14 can be easily fixed at these positions. Therefore, the reactor 1b can be provided at lower cost. In addition, since the winding 21 is held by the bobbin 30, the winding 21 can be wound in an orderly manner, and characteristic variations among individuals can be reduced. In addition to this, the presence of the bobbin between the core and the winding makes it possible to strengthen the core-winding insulation and improve the withstand voltage performance.

=== Third Example ===
In a reactor that handles a large current, it is necessary to increase the cross-sectional area of the winding, and the diameter of a single winding increases, making it difficult to reduce the thickness. Therefore, in some cases, the diameter thickness, that is, the thickness in the vertical direction may be reduced without changing the substantial cross-sectional area by using two windings connected in parallel. However, when a single-layer coil is formed by two windings, the lengths of the windings differ between the inner and outer circumferential sides, and the resistance value and the inductance value change between the inner and outer circumferential windings. It will Therefore, the intended characteristics may not be obtained. Therefore, as a third embodiment of the present invention, a reactor capable of reducing the difference between the characteristics of the inner and outer coils while using two windings will be described.

  FIG. 8 shows an example of a winding procedure of the windings (121a, 121b) in the reactor 1c according to the third embodiment. Here, the winding procedure of winding (121a, 121b) was shown in order of FIG. 8 (A)-(D). The reactor 1c according to the third embodiment is obtained by winding two windings (121a, 121b) connected in parallel to the same bobbin 30 as the reactor 1b of the second embodiment. 8A and 8B show the bobbin 30 so that the positional relationship between the bobbin 30 and the winding (121a, 121b) can be seen in FIGS. 8A and 8B, and FIGS. The bobbin 30 is omitted so that the winding state of the winding (121a, 121b) can be well understood, and the winding (121a) wound as the coil 120a for one layer via the first guide portion 41 , 121 b) are shown in a simplified manner.

  First, as shown in FIG. 8A, the winding start portion 121c of the two windings (121a, 121b) is inserted through the winding introduction portion 45 formed on the front guide portion 40a of the bobbin 30. The wire (121a, 121b) is introduced into the groove of the bobbin and wound around the middle leg insertion hole 32. Then, as shown in FIG. 8B, the winding (121a, 121b) is wound until the left and right width of the rear guide piece 44 is reached, and the winding (121a, 121b) is formed along the first guide portion 41. To form a single-layer coil 120a. Then, as shown in FIG. 8C, the winding (121 a, 121 b) finished to be wound around the first guide portion 41 is guided to the second guide portion 42. At this time, in the first guide portion 41, the winding 121a located on the inner peripheral side and the winding 121b located on the outer peripheral side are interchanged so as to be located on the outer peripheral side and the inner peripheral side. Then, after appropriately replacing the outer circumference side and the inner circumference side in the process of winding the windings (121a, 121b) so that the total extension of the two windings (121a, 121b) becomes equal, the winding is derived The winding end portion 121d of the winding (121a, 121b) is led out in a predetermined direction via the portion 46.

  The characteristics of the reactor according to the third example are shown in Table 1 below.

表１では、内周側と外周側の巻線の入れ替えを行わなかったリアクトルと、入れ替えを行ったリアクトルの特性が示されている。表中の「外周側」と「内周側」は、それぞれ巻き始めにおける巻回状態を示しており、巻線の入れ替えを行わなかったリアクトルでは、各巻線は、巻き終わりまで、その巻回状態を維持する。巻線の入れ替えを行ったリアクトルでは、巻回途上で、内周側と外周側とで入れ替わる。

In Table 1, the characteristic of the reactor which did not replace the winding of the inner peripheral side and the outer peripheral side and the reactor which replaced is shown. The “outer side” and “inner side” in the table respectively indicate the winding state at the beginning of the winding, and in the reactor in which the winding was not replaced, each winding has the winding state until the winding end. Maintain. In the reactor in which the winding has been replaced, the inner circumferential side and the outer circumferential side are interchanged while winding.

  And as Table 1 showed, the reactor which did not replace | exchanged the direct current resistance value of the winding of the outer periphery side with a long total extension longer than the DC provision value of the winding of an inner peripheral side was 0.28 m ohms. The inductance value of the winding on the outer peripheral side was 4.78 μH greater. On the other hand, in the reactor according to the third embodiment in which the windings were replaced, the difference in DC resistance value was only 0.1 mΩ, and the difference in inductance value was 1.91 μH, and from the reactor which was not replaced. The difference between the inductance values of the windings on the inner and outer circumferential sides could be significantly reduced. As described above, in the reactor according to the third embodiment, the difference between the DC resistance value and the inductance value between the two windings can be reduced, and it has been confirmed that the loss of the reactor can be reduced. In the reactor according to the third embodiment, the length position at which the winding 121a on the outer circumferential side and the winding 121b on the inner circumferential side are interchanged is the thickness of the winding (121a, 121b) and the lateral width of the guide piece 44 It may be set according to the situation. Of course, even if the inner and outer circumferential sides are interchanged at every opportunity when the winding (121a, 121b) is derived from the arrangement region 36 of the core 10 in the bobbin 30, the total extension of the inner and outer circumferential windings is It will be the same. In any case, the outer circumferential side and the inner circumferential side of the winding (121a, 121b) in the process of winding so that the total extension of the two windings (121a, 121b) connected in parallel becomes equal. You can replace the. Of course, the number of windings may be two or more.

=== Other Examples ===
In each of the above embodiments, the core structure is EE type, but as long as the core has a gap 13 in the middle leg, it may be core of other structure such as EI type.

  In the second embodiment, the guide portion of the bobbin is formed of a plate-like or tongue-like protrusion, but the winding is at upper and lower positions corresponding to the front and rear end faces of the base portion of the core at the front and rear ends of the core, Any structure may be used as long as it can be distributed and guided to the upper and lower positions corresponding to the middle legs. For example, as shown in FIG. 9, pins (48a, 49a, 48b, 49b) projecting in the front-rear direction are provided at positions corresponding to the four corners of the region where the pair of upper and lower guide pieces 44 are formed. The region of the upper and lower center sandwiched between the upper and lower two sets of pins (48a-49a, 48b-49b) is used as a first guide portion 41, with two adjacent pins (48a and 49a, 48b and 49b) as one set. The upper and lower sets of upper and lower sets can also be used as the second guide portion 42.

  In the reactor according to each of the above embodiments, coils for one layer are formed around the winding axis, and three lead wires in the vertical direction are guided on the front and rear end sides of the core. If the winding is thin, a plurality of windings may be arranged in the vertical direction in the first and second guide portions.

  In the reactor in each of the above embodiments, the winding is introduced from the upper front into the arrangement region of the core and is derived toward the same direction, but the winding may be introduced and derived in any direction. . Further, in the reactor using the same bobbin as that of the second embodiment, a notch for holding the winding may be formed according to the introduction and lead-out position of the winding.

1a, 1b, 101 reactors, 10 cores, 10a, 10b E core, 11 outer legs, 12 middle legs, 13 gaps, 14 bases, 15 base portions, front and rear end faces, 20 coils 21, 121a, 121b windings, 30 Bobbin, 31 groove, 32 middle leg insertion hole, 36 core arrangement area, 40, 40a guide portion, 41 first guide portion, 42 second guide portion, 43, 43a guide plate, 44, 44a guide piece, 45 Winding introduction part, 46 winding lead-out part, 47a to 47c notches

Claims (6)

A reactor comprising: a core having a gap in an intermediate leg; and a coil formed by winding a winding with the intermediate leg as a winding axis,
The core is flat in the vertical direction, and has outer legs extending in the front and rear direction at the left and right ends of a rectangular flat base having a horizontal direction and the front and rear direction, and the middle leg is in the front and rear direction in the horizontal center It is extended and formed,
The winding is wound around the middle leg in a region where the core is disposed, as viewed from the upper and lower direction, and a winding drawn out of the region of the core from the middle of winding is the winding. It is guided in the lateral direction along the front and rear end faces of the base portion,
A reactor characterized by In the reactor according to claim 1,
It has a flat box-like top and bottom, and a bobbin having a hole formed therein for connecting the top and bottom and through which the middle leg of the core is inserted,
The bobbin has grooves formed on the left and right sides with bottom surfaces on the left and right sides of the hole as bottom surfaces, and also includes guide portions for guiding the winding in the left and right directions at predetermined vertical positions on both front and rear surfaces.
The guide portion is a first guide portion for guiding the winding in a range of predetermined lateral width at the upper and lower positions between the upper end and the lower end of the middle leg, and the front and rear end surfaces of the base portion of the core And a second guide portion for guiding the winding over the lateral width of the bobbin at corresponding upper and lower positions, the winding being wound along the groove and the first guide portion from the winding start After being turned, it is wound along the second guide portion along the front and rear end faces of the upper base portion of the core and along the front and rear end faces of the lower base portion.
A reactor characterized by In the reactor according to claim 2,
The first guide portion is constituted by a pair of tongue pieces which have a predetermined lateral width, project in the front-rear direction, and face in the vertical direction.
The second guide portion has a normal in the front-rear direction, extends in the left-right direction, and is in contact with the front and rear end faces of the base portion of the core, and from the upper edge and the lower edge of the wall forward It has a pair of upper and lower guide plates that project like a bowl,
The second guide portion is configured by the upper guide plate and the upper tongue piece, and the lower guide plate and the lower tongue piece.
A reactor characterized by In claim 3,
The bobbin holds a winding start portion of the winding and introduces a winding into the groove, and a winding end portion of the winding holds the winding outward. And a winding lead-out portion for leading in the direction of
The winding introduction portion is formed in any one of the front and rear guide portions, and includes the guide plate constituting the upper and lower one of the second guide portions and a notch formed at a predetermined left and right position of the tongue piece.
The winding lead-out portion is formed on any one of the front and rear guide portions, and includes a notch formed on the upper or lower guide plate.
A reactor characterized by In the reactor according to any one of claims 2 to 4,
The winding comprises two or more windings connected in parallel, and after each of the two or more windings is wound while maintaining the inner peripheral side and the outer peripheral side at the upper and lower center positions The inner circumferential side and the outer circumferential side are interchanged while being guided by the second guide portion such that the total extension of the two or more windings is equal.
A reactor characterized by A bobbin for a reactor comprising: a core having a gap in an intermediate leg; and a coil formed by winding a winding with the intermediate leg as a winding axis,
It is a flat box shape up and down, extending in the front and back direction while connecting both the upper and lower sides, a hole through which the middle leg of the core is inserted, and a groove formed on the left and right side surfaces And a guide portion for guiding the winding in the left and right directions at predetermined vertical positions on both front and rear sides,
The guide portion is a first guide portion for guiding the winding in a range of predetermined lateral width at the upper and lower positions between the upper end and the lower end of the middle leg, and the front and rear end surfaces of the base portion of the core And a second guide for guiding the winding over the width of the bobbin at corresponding upper and lower positions.
A bobbin for a reactor characterized by

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