JP2017050405A - Coil support - Google Patents

Abstract

PROBLEM TO BE SOLVED: To support a core of different size on a bobbin, by means of one kind of coil support.SOLUTION: A coil support 8 has a cylindrical support 12 projecting from one surface of a tabular base 10, and a cylindrical support 16 projecting from the other surface. The inner peripheral surface of the cylindrical support 12 is flush with the outer peripheral surface at one end of the core 2a around which a primary winding 4a is wound, and the inner peripheral surface of the cylindrical support 16 is flush with the outer peripheral surface of a core 2b having a diameter different from that of the core 2a. The outer peripheral surface of the base 10 is flush with the inner peripheral surface of a bobbin 6. The bobbin 6 houses the core 2a or 2b in the length direction, the opposite ends of the bobbin are opened, and a secondary winding 20 is wound around the outer peripheral surface.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a coil support that supports a core around which a winding is wound on a bobbin around which the winding is wound.

  Conventionally, as a coil in which two windings wound around a core are mutually inductively coupled, there is a transformer as disclosed in Patent Document 1, for example. According to the technique of Patent Document 1, a secondary winding is wound around the outer peripheral surface of a cylindrical bobbin, and the primary winding is wound on the outer side of the secondary winding, approaching the secondary winding. A cylindrical core is inserted into the bobbin. No separate insulator is disposed between the primary winding and the secondary winding.

JP 2007-149797 A

  In the technique of Patent Document 1, for example, the primary winding and the secondary winding may be appropriately selected to generate a high voltage in the secondary winding. In this case, according to the technique of Patent Document 1, since the primary winding and the secondary winding are arranged close to each other on the bobbin, a sufficient insulation distance cannot be ensured. Since an insulator is not disposed between the secondary winding and the secondary winding, the two cannot be sufficiently insulated. In addition, a core is inserted in the bobbin to increase the magnetic flux interlinking with the primary and secondary windings. If the positional relationship between the core and the two windings changes, mutual inductive coupling Changes and stable operation cannot be performed. There is no specific disclosure in Patent Document 1 on how to fix the core.

  In order to improve this point, the applicant of the present application is to place a core around which at least one first winding is wound around the outer circumference along a length direction inside a bobbin having both ends made of an insulator. The core dimensions are selected so that both ends of the core are located inside the both ends of the bobbin, and the closing members are respectively inserted into both ends of the bobbin to close both ends of the bobbin. A coil was proposed that was supported in a non-contact manner with the inner peripheral surface of the bobbin and was wound around at least one second winding on the outer peripheral surface of the bobbin.

  According to this technique, since the closing member supports the core in the bobbin at a predetermined distance from the bobbin, the at least one first winding and the at least one second winding have a sufficient insulation distance. The core is held in the bobbin by the closing member so that the position of the core does not change, and the core and the first and second windings can be secured. The positional relationship of is not changed.

  In this technique, a support provided with a cylindrical body support body having an inner peripheral surface coinciding with the outer peripheral surface of the core on one surface of the base portion having an outer peripheral surface coinciding with the inner peripheral surface of the cylindrical body is closed. It has also been proposed to use the core as a member to support the core at the end of the cylindrical body. However, cores having different sizes may be used depending on the coil specifications. Therefore, when using the above-mentioned support tool, it is necessary to prepare a plurality of types of support tools in advance according to the size of the core, and the plurality of types of support tools must be manufactured in advance. In addition, the multiple types of support tools must be individually managed, which is troublesome.

  The present invention can be used in common for a plurality of types of cores by preparing only one type of coil support for supporting the core on which the winding is wound on the bobbin on which the winding is wound. The purpose is to do.

  The coil support of one embodiment of the present invention has a plate-like base portion. A first cylindrical support is formed on one surface of the base portion so as to protrude from the base portion. A second cylindrical support is formed on the other surface of the base portion so as to protrude from the base portion. The 2nd cylindrical support body is located inside the inner peripheral surface of the 1st cylindrical support mode. The base portion and the first and second cylindrical supports can be made of, for example, a synthetic resin. The first cylindrical support has an inner peripheral surface that coincides with an outer peripheral surface of one end of the first core, and the first core has at least one first winding wound around the outer periphery. Yes. The second cylindrical support body has an inner peripheral surface that coincides with the outer peripheral surface of the second core having an outer peripheral surface smaller than the first core. The outer peripheral surface of the base portion coincides with the inner peripheral surface of the bobbin. The bobbin accommodates the first or second core along the length direction, has both ends opened, and at least one second winding is wound around the outer peripheral surface. The first and second cores can be, for example, cylindrical or prismatic. At least one first winding wound around the first and second cores can be a primary winding or a secondary winding. One first winding may be used as a primary winding, and the other first winding may be used as a secondary winding and wound on the core. The at least one first winding may have a circular or square longitudinal cross-sectional shape. The bobbin can be a cylindrical shape or a rectangular tube shape. The at least one second winding wound around the bobbin can be a secondary winding when the at least one first winding is a primary winding, and the at least one first winding is In the case of a secondary winding, it can be a primary winding. One second winding may be a primary or secondary winding, and another second winding may be another secondary winding. As the at least one second winding, one having a circular or square longitudinal section can be used, or one having an insulating coating can be used.

  When the first core is fixed to the bobbin with the coil support tool configured as described above, two coil support bodies are prepared, and the first cylindrical body periphery on one surface of the base portion is prepared. The first cores are respectively inserted into the two first cylindrical bodies so that the outer peripheral surfaces of both ends of the first core are in contact with the surface. The bobbin is disposed so that the two coil support tools and the first core are accommodated therein, and the outer peripheral surfaces of the base portions of the two coil support tools are in contact with the inner peripheral surfaces of both ends of the bobbin. The first core is fixed.

  When the second core is fixedly supported on the bobbin, the two outer peripheral surfaces of the second core are in contact with the second cylindrical body peripheral surface on the other surface of the base portion of the coil support. The second core is inserted into each of the two second cylindrical bodies so that the outer peripheral surfaces of both ends of the second bobbin are in contact with the inner peripheral surface of the second cylindrical body. The bobbin is disposed so as to accommodate the two coil support tools and the second core inside, and the outer peripheral surfaces of the base portions of the two coil support tools are in contact with the inner peripheral surfaces of both ends of the bobbin. The second core is fixed.

  In this way, by using one type of coil support tool, the first and second cores having outer peripheral surfaces of different sizes can be attached to the bobbin.

  In the coil support according to the above aspect, the bobbin can be prevented from coming off on the outer peripheral surface of the base portion so as to protrude outward. One or more stoppers can be provided. When the retaining member is provided in this manner, the retaining member comes into contact with the inner peripheral surface of the bobbin, so that the coil support can be firmly fixed to the bobbin.

  In the coil support according to the above aspect, the cylindrical support may be arranged such that the central axis thereof coincides with the central axis of the base portion. In this case, a hole is formed in the center of the base portion so as to penetrate between one surface and the other surface. With this configuration, the distance between the first or second core and the bobbin can be maintained uniformly, and the inside of the bobbin can be observed through the through-hole, so that the core is accurately positioned at the center of the base portion. It can be confirmed whether it is attached or not.

  In the coil support tool according to the above aspect, a cut is formed from the outer peripheral surface of the base portion to the inner peripheral surface of the second cylindrical support. The number of cuts is an arbitrary number. If comprised in this way, even when using either the 1st and 2nd cylindrical support bodies and fixing the 1st or 2nd core to a bobbin, at least 1 1st wound around a core The end of the winding can be easily led out through the notch to the outside of the bobbin.

  In the coil support according to the above aspect, the second cylindrical support may be configured such that an outer peripheral surface thereof coincides with an inner peripheral surface of another bobbin smaller than the bobbin. If comprised in this way, when using a 2nd bobbin, another bobbin with an outer peripheral surface smaller than said bobbin can also be used.

  In the coil support of the above aspect, the outer peripheral surface of the base portion can be the outer peripheral surface of the first cylindrical support. If comprised in this way, since the outer peripheral surface of a base part and the outer peripheral surface of a 1st cylindrical support body correspond, even when using any of the 1st and 2nd bobbins, the inside of a bobbin The coil support tool can be inserted up to an arbitrary position, and even when there are a plurality of first and second bobbins having different lengths, these can be attached to the bobbin.

  As described above, when the coil support tool according to the present invention is used, it is possible to attach the core to the bobbin in common with at least two types of cores by preparing only one type of coil support tool. As a result, only one type of coil support is prepared in advance, which facilitates manufacture and facilitates inventory management.

It is a vertical side view of the state where different cores were respectively attached to different bobbins using the coil support of one embodiment of the present invention. It is the vertical side view, front view, and rear view of the coil support tool of FIG. It is sectional drawing which follows the 3-3 line shown to the front view of FIG. It is a vertical side view which shows another use condition of the coil support tool of FIG.

  The coil support of one embodiment of the present invention is used for a coupling coil, for example. For example, in an electric arc welder, a coupling coil temporarily applies a high-frequency, high-frequency voltage to a welding load to break the insulation and generate an arc in the welding load. Therefore, it is used to boost the high frequency voltage and supply it to the welding load.

  In this coupling coil, at least one first winding, for example, a primary winding wound around the peripheral surface of the core is accommodated inside the bobbin 2, and at least one second winding is disposed on the outer peripheral surface of the bobbin. The secondary winding is wound, and the primary winding and the secondary winding are mutually inductively coupled. In order to support the core on the bobbin, the coil support of one embodiment of the present invention is used. Further, as the core, the first and second cores, for example, one of the two types having different sizes is used, and the same coil supporter is used regardless of which core is used. Can be used.

  FIGS. 1A and 1B show a state in which cores 2a and 2b each having a columnar shape having a different size, for example, a columnar shape, are supported on a bobbin 6 by using the same coil support 8. ing. Compared to the core 2a, the core 2b has a smaller outer diameter and a shorter length.

  In the coupling coil shown in FIG. 1A, at least one first winding, for example, a primary winding 4a is wound around the outer peripheral surface of the core 2a. The primary winding 4a is wound in a predetermined number of turns at a predetermined pitch along the length direction of the core 2a. As the primary winding 4a, for example, an insulation-coated wire having a predetermined diameter with a circular longitudinal section is used.

  A cylindrical bobbin 6, for example, a cylindrical bobbin 6 is disposed so as to surround the core 2a around which the primary winding 4a is wound. The bobbin 6 is made of an insulator having both ends opened, and the inner diameter is selected so that the core 2a around which the primary winding 4a is wound can be accommodated. The length dimension of the bobbin 6 is larger than the length dimension of the core 4a so that all the cores 2a are located inside the bobbin 6 and both ends of the core 2a are located somewhat inside the both open ends of the bobbin 6a. Has also been selected for a long time.

  In order to hold and fix the core 2a around which the primary winding 4a is wound in the bobbin 6, the coil support 8 according to the embodiment of the present invention is used. The coil support 8 is made of a synthetic resin, such as polyethylene terephthalate, and is somewhat flexible. As shown in FIG. 2A, the coil support 8 is provided with a plate-like base portion 10. Yes. The base portion 10 has a diameter equal to the inner diameter of the bobbin 6.

  A first cylindrical body, for example, a cylindrical support body 12 for supporting the bobbin 2a protrudes perpendicularly to the one surface from the periphery of one surface of the base portion 10. This cylindrical support 12 is formed in a substantially cylindrical shape, and its protruding tip is open. The cylindrical support 12 is formed concentrically with the base 10 and, as shown in FIG. 2 (c), a part of the cylindrical support 12 is missing at a predetermined angle in the circumferential direction from the base 10 to the protruding tip, for example, every 90 degrees. Has been removed. The cylindrical support 12 is selected to have an outer diameter equal to the diameter of the base portion 6 so that the outer peripheral surface is in surface contact with the inner peripheral surface of the bobbin 6 as shown in FIG. Further, the inner diameter is selected so that the inner peripheral surface of the cylindrical support 12 is in surface contact with the outer peripheral surface of the core 2a.

  As shown in FIG. 3, a retainer 14 is formed across a part of the outer peripheral surface of the base portion 10 and a part of the outer peripheral surface of the cylindrical support 12 connected to the base portion 10. The stopper 14 is formed in a protruding shape that protrudes further outward from the outer peripheral surface of the base portion 10 and the outer peripheral surface of the cylindrical support 12, and a part thereof is omitted as shown in FIG. Two pieces are formed on each of the remaining cylindrical supports 12. These retainers 14 press the inner peripheral surface of the bobbin 6 when the cylindrical support 12 and the base portion 10 are inserted into the inner peripheral surface of the bobbin 6, and the coil support 8 is difficult to come off from the bobbin 6. Is to do.

  Both ends of the core 2a are respectively inserted into the cylindrical bodies 12 of the two coil supports 8, the bobbins 6 are arranged so as to cover the core 2a, and the inner peripheral surfaces of both ends of the bobbin 6 support the two coils. The core 2 a is attached to the bobbin 6 so as to be in contact with the base portion 10 of the tool 8.

  As shown in FIG. 1A, at least one second winding, for example, a secondary winding 22 is wound around the outer peripheral surface of the bobbin 6. This secondary winding 22 is also wound in two layers with an insulation covered wire having a circular longitudinal cross-sectional shape and having a predetermined diameter, and an insulating tube 24 is disposed between the first layer and the second layer. The number of turns of the secondary winding 22 is larger than the number of turns of the primary windings 4a and 4b. Accordingly, the high frequency voltage applied to the primary winding 4 a or 4 b is boosted and generated across the secondary winding 22.

  From the other surface of the base portion 10 of the coil support 8, a second cylindrical body, for example, a cylindrical support body 16 for the core 2 b, protrudes perpendicularly to the other surface. The cylindrical support body 16 is also formed in a substantially cylindrical shape, its protruding tip is opened, and a part thereof is omitted at the same place where a part of the cylindrical support body 12 is omitted. The cylindrical support body 16 is also formed concentrically with the base portion 10. As shown in FIG. 1B, the cylindrical support 16 is for supporting a core 2b having a smaller length and diameter than the core 2a by a bobbin 6, and its inner peripheral surface is the outer periphery of the core 2b. The inner diameter is selected to match the surface. The outer diameter of the cylindrical support 16 is selected to be smaller than the inner peripheral surface of the cylindrical support 12. Supporting the core 2b with the bobbin 6 by the coil support 8 will be described later.

  As shown in FIG. 1A, when the core 2 a is attached to the bobbin 6 by the coil support 8, both ends 41 a and 41 a of the primary winding 4 a wound around the core 2 a are led out of the bobbin 6. Or both ends 42a and 42a of the primary winding 4b wound around the core 2b as shown in FIG. 1 (b) must be led out of the bobbin 6. Therefore, the coil support 8 is formed with a notch 18 for winding winding. As shown in FIGS. 2B and 2C, a plurality of the notches 18 are formed, and for example, four notches are formed at intervals of 90 degrees, for example, at intervals in the circumferential direction of the base portion 10. The positions where these notches 18 are formed correspond to the positions where the cylindrical supports 12 and 16 are removed. The four notches 18 have the same shape and are formed in an arc shape from the outer peripheral portion of the base portion 10 to the inner peripheral surface of the cylindrical support 16.

  When the core 2a is attached to the bobbin 6 as shown in FIG. 1 (a), or when the core 2b is attached to the bobbin 6 as shown in FIG. 1 (b), the inner peripheral surface of the cylindrical support 16 Since the notch 18 is formed so as to reach the end, the diameter inserted into the bobbin 6 is small even when the core 2a having a large diameter inserted into the bobbin 6 is supported as shown in FIG. Even in the support state of the core 2 b, both ends 41 a and 41 a of the primary winding 4 a or both ends 42 a and 42 a of the primary winding 4 b are led out of the bobbin 6 through any notch 18 of the coil support 8. be able to. The plurality of cutouts 18 are formed in order to lead out both ends 41a, 41a of the primary winding 4a and both ends 42a, 42a of the primary winding 4b from the cutout 18 at the closest position. . The notch 18 has a shape in which the outer peripheral side of the thin plate-like base portion 10 is narrowed. When the coil support 8 is inserted into the bobbin 6, the notch 18 is deformed so that the outer peripheral side of the notch 18 is further narrowed and is derived from the notch 18. Since both ends 41a and 41a of the primary winding 4a or both ends 42a and 42a of the primary winding 4b are held on the inner peripheral side in the notch 18, both ends 41a, 41a or 1 of the primary winding 4a Both ends 42a and 42a of the next winding 4b can be prevented from rubbing against the bobbin 6, and the occurrence of abnormal noise that may occur due to the breakage of the wire or the bobbin 6 can be suppressed.

  A through hole 20 is formed at the center of the base portion 10 so as to penetrate one surface and the other surface of the base portion 10. Whether or not the inside of the bobbin 6 can be observed through the through hole 20 in a state where the coil support 8 is attached to the bobbin 6 and during the attaching operation, and the core 2a is located in the cylindrical support 12 Whether or not the core 2b is located in the cylindrical support 16 can be confirmed.

  The coil support 8 attaches the core 2a to the bobbin 6 as shown in FIG. For example, one end of the core 2a, that is, the left end of the core 2a in FIG. 1A is inserted into the inner peripheral surface of the cylindrical support 12 of one coil support 8, and one end 41a of the primary winding 4a is inserted. Is led out to the cylindrical support 16 side through the notch 18. The other end of the core 2a to which the coil support 8 is not attached, that is, the right end is inserted into the bobbin 6 from one end of the bobbin 6a, that is, the left end side, and a cylindrical body is formed at the left end of the core 2a. The outer peripheral surface of the base portion 10 of the coil support 8 to which the coil support 16 is attached is brought into surface contact with the inner peripheral surface of the left end portion of the bobbin 6 to fix one coil support 8 to the bobbin 6a.

  Thereafter, another coil support 8 is inserted into the bobbin 6 from the right end of the bobbin 6, and the outer periphery of the right end of the core 2a is formed on the inner peripheral surface of the cylindrical body 12 of the other coil support 8. The surface is brought into surface contact and the outer peripheral surface of the base portion 10 is brought into surface contact with the inner peripheral surface of the right end portion of the bobbin 6. In this manner, the bobbin 2a can be attached to the bobbin 6 by the two coil supports 8. At this time, another coil support 8 is inserted from the right end of the bobbin 6 while observing the inside of the bobbin 6 from the through-hole 20 of the other coil support 8, so that the other coil support The outer peripheral surface of the core 2 a can be easily brought into surface contact with the inner peripheral surface of the cylindrical body 12 of the support 8. Before the attachment, the other end 41a of the primary winding 4a is inserted into the notch 18 of the other coil support 8 and the other coil support 8 is connected to the other end of the bobbin 6. The other end 41a of the primary winding 4a can be led out of the bobbin 6 in a state of being attached to the part.

  Thereafter, the secondary winding 20 is wound around the bobbin 6. Alternatively, the secondary winding 20 may be wound around the bobbin 6a before the core 2a is attached to the bobbin 6a. Since the stopper 14 is formed on the cylindrical body 12 and the base portion 10, the coil support 8 is firmly attached to the bobbin 6, and the coil support 8 does not come off the bobbin 6. When removing the core 2 a from the bobbin 6 for maintenance and inspection, an operator puts a finger on the through-hole 20 of the coil support 8 and removes the coil support 8 from the bobbin 6. Thus, the through hole 20 is also used for pulling out the coil support 8. FIG. 1A shows an example in which the cylindrical support 16 of the coil support 8 protrudes outside the bobbin 6, but when the length of the core 2a is short, the cylindrical support 16 Can be used by being pushed into the bobbin 6 so as to fit into the bobbin 6.

  In FIG. 1B, the core 2b is attached to the bobbin 6b by using the cylindrical body 16 side of the coil support 8. As described above, the cylindrical support 16 has an inner diameter selected so that the inner peripheral surface thereof coincides with the outer peripheral surface of the core 2 b, and the outer diameter of the cylindrical support 16 is the inner periphery of the cylindrical support 12. Since it is selected to be smaller than the surface, the core 2b having a diameter smaller than that of the core 2a can be supported on the bobbin 6 by using the cylindrical body 16. However, since the length of the core 2b is shorter than that of the core 2a, both ends of the core 2b are inserted into the cylindrical body 16, so that the coil support 8 is not only the outer periphery of the base portion 10, but also the cylindrical shape. The outer peripheral surface of the body 12 is also penetrated into the bobbin 6, and the outer peripheral surface of the cylindrical body 12 is also in contact with the inner peripheral surface of the bobbin 6. Therefore, as long as the length of the core to be used is shorter than the bobbin 6, the core can be attached to the bobbin 6 regardless of the length. If the core 2a has a short length such as the bobbin 2b, the base portion 10 is connected to the bobbin so that the end of the core 2a can be inserted into the cylindrical body 12 in FIG. 6 is disposed at an inner position than the end of 6.

  In the state shown in FIG. 1B, since the base portion 10 and the cylindrical body 12 have entered the bobbin 6, the retaining member 14 formed on these contacts the inner peripheral surface of the bobbin 6, and the coil The support 8 does not come off from the bobbin 6. Since the attachment of the core 2b to the bobbin 6 is performed in the same manner as the attachment of the core 2a to the bobbin 6, except that the coil support 8 is inserted into the bobbin 6, a detailed description thereof will be omitted.

  4 shows a state in which the core 2b shown in FIG. 1B is attached to the bobbin 6a having a smaller inner diameter than the bobbin 6 and matches the outer diameter of the cylindrical body 16 by using the coil support 8. Show. In this case, the inner diameter of the bobbin 6a coincides with the outer diameter of the cylindrical support 16, and the outer peripheral surface of the cylindrical support 16 of the coil support 8 is inserted into the inner peripheral surfaces of both ends of the bobbin 6a. The core 2b is supported by the bobbin 6a. As described above, when the outer peripheral surface of the cylindrical support 16 is brought into contact with the inner peripheral surface of the bobbin, the core 2b can be attached to the bobbin 6a having a diameter different from that of the bobbin 6.

  In the coupling coil using the coil support 8, the core 2 a around which the primary winding 4 a is wound or the core 2 b around which the primary winding 4 b is wound is disposed in the bobbin 6, and the secondary winding. Since the wire 20 is disposed outside the bobbin 6, the physical distance between the primary windings 4a and 4b and the secondary winding 20 is increased, and the insulation distance between them can be increased. As a result, sufficient insulation between the two can be ensured. In addition, since the cores 2a and 2b having a length shorter than that of the bobbin 6 are used and the cores 2a and 2b are held in the bobbin 6 by the coil support 8, the secondary winding 20 of the cores 2a and 2b. The insulation can be kept constant without the distance between the primary windings 4a and 4b being changed. Further, only by attaching the coil support 8 to both ends of the core 2a or 2b and attaching the coil support 8 to the bobbin 6, the work of attaching the core to the bobbin becomes easy. Moreover, since the coil support 8 can be used in common for the cores 2a and 2b having different sizes, only one type of the coil support 8 needs to be manufactured, and the manufacture becomes easy. Inventory management is also easy.

  In said embodiment, although the coil support tool of this invention was implemented in the coupling coil, it is not restricted to this, For example, the coil support tool of this invention can also be implemented in a transformer.

  Only the primary winding 4a or 4b is wound around the core 2a or 2b as the first winding, but another primary winding is wound around the core 2a or 2b in addition to the primary winding 4a or 4b. It is also possible to turn and use another first winding as another secondary winding. Similarly, the secondary winding 20 is wound around the outer peripheral surface of the bobbin 6a or 6b as the second winding. However, the present invention is not limited to this and the outer peripheral surface of the bobbin 6 is not limited to this. It is also possible to wind another second winding and use this second winding as another secondary winding. As the primary windings 4a, 4b, and the secondary winding 20, an insulation-coated wire having a predetermined longitudinal diameter and a circular cross-sectional shape is used. However, the present invention is not limited to this. For example, a flat rectangular wire should be used. You can also.

  The cores 2a and 2b are cylindrical, but prismatic ones can be used. Similarly, the bobbins 6a and 6b are cylindrical, but rectangular tubes can also be used. Further, although four cuts 18 are provided, at least one cut may be provided. Moreover, although the cylindrical support bodies 12 and 16 were divided | segmented and formed so that it might be divided | segmented in the position of the notch | incision 18, they can also be formed integrally. Insulating tube 24 was used, but this is not necessary in some cases. Although the stopper 14 is formed on the base 10 and the cylindrical body 12, it can be formed only on the base 10 at least. In some cases, the retainer 14 can be omitted.

2a 2b Core 4a 4b Primary winding (at least one first winding)
6 Bobbin 8 Coil support 10 Base 12 Tubular support (first tubular support)
16 cylindrical support (second cylindrical support)
22 Secondary winding (at least one second winding)

Claims (6)

A plate-like base,
A first cylindrical support formed on one surface of the base portion so as to protrude from the base portion;
A second cylindrical support body formed in a protruding state from the base portion inside the inner peripheral surface of the first cylindrical support body on the other surface of the base portion;
The first cylindrical support has an inner peripheral surface that coincides with an outer peripheral surface of one end of the first core around which at least one first winding is wound on the outer periphery; The cylindrical support body of 2 has an inner peripheral surface coinciding with an outer peripheral surface of the second core having an outer peripheral surface smaller than the first core,
The outer peripheral surface of the base portion accommodates the first or second core along the length direction, both end portions are opened, and at least one second winding is wound on the outer peripheral surface. A coil support that matches the inner peripheral surface of the bobbin.   The coil support according to claim 1, wherein the bobbin is prevented from coming off on the outer peripheral surface of the base portion so as to protrude outward.   2. The coil support according to claim 1, wherein the first and second cylindrical supports are arranged such that a central axis thereof coincides with a central axis of the base portion, and one of the first and second cylindrical supports is provided at the center of the base portion. The coil support tool which formed the hole which penetrated between the surface of this and the other surface.   The coil support according to claim 1, wherein a notch reaching the inner peripheral surface of the second cylindrical support from the outer peripheral surface of the base portion is formed.   2. The coil support according to claim 1, wherein the second cylindrical support is configured such that an outer peripheral surface thereof coincides with an inner peripheral surface of another bobbin smaller than the bobbin. 3. .   The coil support according to claim 1, wherein an outer peripheral surface of the base portion is an outer peripheral surface of the first cylindrical support.

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