JP6460168B1 - Coil device - Google Patents

Abstract

A coil device that can be miniaturized and that can suitably ensure insulation characteristics is provided.
[Solution]
A hollow cylindrical first hollow cylinder portion 22 around which the first coil 72 is wound on the outer periphery, a first terminal flange portion 26 projecting from one end of the first hollow cylinder portion 22 in the outer direction, and a first terminal flange portion A first bobbin 20 having side walls 291 and 292 having wall surfaces protruding from the inner periphery of the first terminal 72 and extending from the inner periphery to the outer periphery, and a first hollow cylinder And a side wall portion 291, 292 having a core 60 a having a shaft leg portion 62 a inserted through the inside of the portion 22 and a connection portion 64 a passing through the outer peripheral side of the first bobbin 20 and connected to one end of the shaft leg portion 62 a. In the coil device 10, unevenness is repeatedly formed on the opposing surfaces 291 a and 292 a from the inner periphery to the outer periphery of the side wall portions 291 and 292.
[Selection] Figure 2

Description

  The present invention relates to a coil device suitably used as a power transformer or the like.

  In a coil device used as a transformer or the like, it is necessary to appropriately ensure insulation between the primary coil and the secondary coil and between the primary coil and the secondary coil and the core. On the other hand, from the viewpoint of miniaturization of the power supply equipment, miniaturization of the coil device included in the power supply equipment is also required. For example, in large power transformers used in fields such as large-scale solar power generation, the voltage applied to the coil device is high, so the required value of the insulation distance expressed by creepage distance and spatial distance also increases. The conventional structure has been difficult to reduce in size.

JP2013-58528A

  This invention is made | formed in view of such a subject, The objective is to provide the coil apparatus which can be reduced in size and can ensure the insulation distance between a coil and a core suitably.

The coil device according to the present invention includes:
A hollow cylindrical first hollow tube portion around which a first coil is wound on the outer periphery, a terminal flange projecting outward from one end of the first hollow tube portion, and from the terminal flange, the first coil A first bobbin having a side wall portion protruding in the winding axis direction and having a wall surface extending from the inner periphery of the terminal flange toward the outer periphery;
A shaft leg portion inserted through the inside of the first hollow cylinder portion, and a core having a connection portion connected to one end of the shaft leg portion through an outer peripheral side of the first bobbin;
Concavities and convexities are repeatedly formed on the wall surface of the side wall portion from the inner periphery to the outer periphery of the side wall portion.

  In the coil device according to the present invention, unevenness is repeatedly formed on the wall surface of the side wall portion from the inner periphery to the outer periphery of the side wall portion. Therefore, the insulation distance (creeping distance and spatial distance) between the first coil and the core (shaft leg) can be extended on the wall surface of the side wall. Therefore, the insulation distance between the first coil and the core can be appropriately ensured without increasing the outer shape of the side wall, and the insulation between the first coil and the core can be suitably ensured. Can do. Therefore, according to the present invention, it is possible to provide a coil device that can be miniaturized and that can suitably ensure an insulation distance between the coil and the core.

  Preferably, an end cover member having a vertical portion disposed between the side wall portion and the connection portion is further provided, and a side surface of the vertical portion facing the side wall portion is provided with a wall surface of the side wall portion. Concavities and convexities that engage with the concavities and convexities formed on are repeatedly formed. With such a configuration, the insulation distance (creeping distance and spatial distance) between the first coil and the core (shaft leg) can be extended on the side surface of the vertical portion. Therefore, it is possible to appropriately ensure the insulation distance between the first coil and the core without enlarging the outer shape of the vertical portion, and suitably ensure the insulation between the first coil and the core. Can do. Further, the core can be disposed on the first bobbin via the end cover member, and the core can be effectively protected by the end cover member.

  Preferably, the end cover member has an end plate disposed between the terminal flange and the connection portion, and is provided on a first facing surface of the terminal flange facing the end plate. Are unevenly formed from the inner periphery to the outer periphery of the terminal flange, and the end facing surface of the end plate facing the terminal flange is formed on the first facing surface. Concavities and convexities that engage with the irregularities are repeatedly formed.

  By adopting such a configuration, the insulation distance (creeping distance and spatial distance) between the first coil and the core (shaft leg) on the first facing surface of the terminal flange and the end facing surface of the end plate. Can be extended. Therefore, it is possible to appropriately secure the insulation distance between the first coil and the core without increasing the outer shape of the terminal flange and the end plate, and the insulation between the first coil and the core can be ensured. It can be suitably secured.

  Preferably, it further includes a center cover member having a partition plate having a through hole formed in the center, and the first bobbin protrudes from the other end of the first hollow cylinder portion in the outer direction, and one of the partition plates The first collar portion has a first flange portion, and the second facing surface facing the partition plate in the first collar portion is repeatedly formed with irregularities from the inner periphery to the outer periphery of the first flange portion. And the unevenness | corrugation which engages with the unevenness | corrugation currently formed in the said 2nd opposing surface is repeatedly formed in the partition opposing surface facing the said 1st collar part in the said partition plate.

  By adopting such a configuration, the insulation distance (creeping distance and spatial distance) between the first coil and the core (shaft leg portion) on the second facing surface of the first flange and the partition facing surface of the partition plate is set. Can be extended. Therefore, it is possible to appropriately secure the insulation distance between the first coil and the core without increasing the outer shape of the first flange and the partition plate, and the insulation between the first coil and the core can be ensured. It can be suitably secured.

  The side wall may be formed on a terminal block provided with a terminal for fixing an end of the first coil. Or the said side wall part may be formed in the core fixing | fixed part which opposes the said connection part and fixes the said core.

FIG. 1A is an overall perspective view of a coil device according to an embodiment of the present invention. FIG. 1B is an overall perspective view of the coil device viewed from another angle. FIG. 2 is an exploded perspective view of the coil device. FIG. 3A is a cross-sectional view of the coil device taken along line IIIA-IIIA shown in FIG. 1A. 3B is a cross-sectional view of the coil device taken along the line IIIB-IIIB shown in FIG. 1A. FIG. 3C is a cross-sectional view of the coil device taken along line IIIC-IIIC shown in FIG. 1A. 3D is a cross-sectional view of the coil device taken along line IIID-IIID shown in FIG. 1A. FIG. 4A is an overall perspective view of a first bobbin included in the coil device. FIG. 4B is a plan view of the first bobbin (terminal flange) viewed from the IVB direction shown in FIG. 4A. FIG. 4C is a bottom view of the first bobbin (first brim portion) viewed from the IVC direction shown in FIG. 4A. FIG. 5 is an overall perspective view of a central cover member included in the coil device. FIG. 6A is an overall perspective view of an end cover member included in the coil device. 6B is a bottom view of the end cover member viewed from the VIB direction shown in FIG. 6A. 6C is a cross-sectional view of the same end cover member along the VIC-VIC line shown in FIG. 6B.

  FIG. 1A is a perspective view of a coil device 10 according to an embodiment of the present invention. The coil device 10 includes a first bobbin 20, a second bobbin 30, a center cover member 40, an end cover member 50, and a core 60. An insulating tape 12 is wound around the surface of the core 60.

  As for the coil device 10 according to the embodiment, as shown in FIG. 1A, the direction perpendicular to the mounting surface on which the coil device 10 is mounted is parallel to the Z-axis direction and the mounting surface, and is shown in FIG. Thus, the direction connecting the two side leg portions 64ab and 64bb of the core 60 passing through both sides of the first bobbin 20 and the second bobbin 30 is the Y-axis direction, and the direction perpendicular to the Z-axis direction and the Y-axis direction is the X-axis direction. Will be described. The direction away from the mounting surface is the upper side of the Z axis, and the opposite is the lower side. Furthermore, in the X-axis and the Y-axis, the direction toward the center of the coil device 10 is the inside, and the opposite is the outside.

  FIG. 2 is an exploded perspective view of the coil device 10 shown in FIG. 1A. The core 60 is formed by assembling a first core 60a and a second core 60b, which are two parts molded separately. The first core 60a and the second core 60b have a substantially symmetrical shape with an E-shaped cross section (EE core), the end cover member 50, the first bobbin 20, the central cover member 40, and The second bobbin 30 is attached so as to be sandwiched from above and below the Z axis. The insulating tape 12 wound around the outer periphery of the core 60 supports the joining of the first core 60a and the second core 60b.

  3A is a cross-sectional view of the coil device 10 shown in FIG. 1A. The core 60 includes shaft leg portions 62 a and 62 b that pass through the inside of the first hollow cylinder portion 22 of the first bobbin 20 and the second hollow cylinder portion 32 of the second bobbin 30, and the first bobbin 20 and the second bobbin 30. It has connection parts 64a and 64b which connect to the both ends of the Z-axis direction of the shaft leg parts 62a and 62b through the outer peripheral side. As shown in FIGS. 2 and 3A, the connecting portions 64a and 64b of the core 60 have side leg portions 64ab and 64bb extending in the Z-axis direction in parallel with the shaft leg portions 62a and 62b, and the side portions of the shaft leg portions 62a and 62b. It has an upper end portion 64aa and a lower end portion 64ba that connect the leg portions 64ab, 64bb in the Y-axis direction.

  As shown in FIGS. 2 and 3A, the shaft leg portions 62 a and 62 b of the core 60 have end through-holes in the end cover member 50 in addition to the insides of the first hollow cylinder portion 22 and the second hollow cylinder portion 32. 54c and the central through hole 44c of the central cover member 40 are also inserted. The shaft leg part 62a and the shaft leg part 62b are opposed to each other with a gap in the center of the coil device 10 in the Z-axis direction. Note that the presence or absence of a gap between the shaft leg portion 62a and the shaft leg portion 62b and the size of the gap are appropriately adjusted according to the characteristics required of the coil device 10.

  As shown in FIG. 2, in the coil device 10, the first bobbin 20 and the second bobbin 30 can be separated in the Z-axis direction, and the central cover member 40 is interposed between the first bobbin 20 and the second bobbin 30. Is placed. Further, an end cover member 50 is attached to the first bobbin 20 from the upper side of the Z axis with respect to the first bobbin 20.

  As shown in FIG. 5, the center cover member 40 extends in the Z-axis upward direction perpendicular to the partition plate 44 from the outer peripheral edge of the partition plate 44 and the ring-shaped partition plate 44 having a central through hole 44 c formed in the center. And a ring-shaped outer peripheral cover portion 42. As shown in FIG. 3A, many parts of the first bobbin 20 are accommodated in the center cover member 40.

  As shown in FIG. 2, the end cover member 50 is disposed in the Z-axis upward direction with respect to the first bobbin 20 and has an end plate 54 in which an end through hole 54 c is formed, and the end plate 54. And a side cover portion 52 extending downward from a part of the outer peripheral edge in the Z-axis direction. The end plate 54 faces the first terminal flange 26 of the first bobbin 20, and the end through hole 54 c is the shaft leg of the core 60 in the same manner as the first hollow cylinder portion 22 of the first bobbin 20. It is inserted through the part 62a.

  As shown in FIG. 2, the side cover portion 52 extends in the Z-down direction from two locations on both sides in the Y-axis direction close to the connection portions 64 a and 64 b of the core 60 on the outer peripheral edge of the end plate 54. ing. As shown in FIG. 3A, the side cover portion 52 is disposed on the outer peripheral side of the outer peripheral cover portion 42 extending in the Z-axis upward direction from the partition plate 44 so as to overlap the outer peripheral cover portion 42. Due to such an arrangement, the side cover portion 52 is disposed between the side leg portion 64ab and the outer peripheral cover portion 42 in the connection portion 64a.

  Further, as shown in FIG. 3A, the side cover portion 52 is disposed on the outer peripheral side of a second cover member 92a described later so as to overlap the second cover member 92a. Due to such an arrangement, the side cover portion 52 is also arranged between the side leg portion 64bb and the second cover member 92a in the connection portion 64b.

  As shown in FIG. 2, the end cover member 50 extends from the other part of the outer peripheral edge of the end plate 54 in the Z-axis upward direction to separate the terminal 82 and the core 60 from the terminal protection portion 56 (vertical portion). )have. The terminal protection part 56 is disposed between the first side wall part 291 (see FIG. 4A) and the connection part 64a of the core 60a. The terminal protection portion 56 has a terminal protection facing surface 56a (side surface of the vertical portion) that faces the first side wall portion 291 of the terminal block 27 formed on the first bobbin 20 described later. The terminal protection part 56 is provided on the X-axis side close to the terminal 82 in the outer peripheral edge of the end plate 54.

  Further, on both sides in the Y-axis direction of the terminal protector 56, between the side leg portion 64ab of the core 60 and the terminal 82 and the first coil end portion 72a (see FIG. 3A), or on the side leg portion 64bb of the core 60 and the terminal. A side core guard portion 58a is provided for separating the space 80 and the second coil end portion 74a (see FIG. 1A). The side core guard part 58a extends from the vicinity of the end part in the Z-axis lower direction of the coil device 10 to the end part in the Z-axis upper direction along the YZ plane.

  Further, as shown in FIG. 2, the end cover member 50 is provided on one side in the X-axis direction on the outer peripheral edge of the end plate 54, and on the Z-axis from another part of the end plate 54 An upper core guard portion 57 (vertical portion) extending in the direction and side core guard portions 58b connected to both sides of the upper core guard portion 57 in the Y-axis direction are provided. The upper core guard portion 57 has a core guard facing surface 57a (side surface of the vertical portion) facing the second side wall portion 292 of the core fixing portion 25 formed on the first bobbin 20 described later.

  As shown in FIGS. 2 and 3A, the first bobbin 20 includes a ring-shaped first flange 24 disposed at an end of the first bobbin 20 in the Z-axis lower direction, and an inner peripheral edge of the first flange 24. And a first hollow cylinder portion 22 projecting upward in the Z-axis and communicating with the central through hole 44c. Further, the first bobbin 20 has a first terminal flange portion 26 that protrudes in the outer diameter direction from the end in the Z-axis upward direction of the first hollow cylinder portion 22, and further, in the first hollow cylinder portion 22. An intermediate flange 28 protruding in the outer diameter direction from the first outer peripheral wall 22a is provided at the center in the Z-axis direction (between the first flange 24 and the first terminal flange 26).

  The intermediate collar part 28 includes a first intermediate collar part 281, a second intermediate collar part 282, and a third intermediate collar part 283. In the illustrated example, the second intermediate collar 282 protrudes farther than the first intermediate collar 281 and the second intermediate collar 283, but the radial length of the second intermediate collar 282 is equal to this. It is not limited.

  As shown in FIG. 3A, a first coil 72 is wound around a first outer peripheral wall 22 a that is an outer peripheral wall of the first hollow cylinder portion 22.

  As shown in FIG. 2, the first facing surface 26 a of the first terminal collar 26 in the first bobbin 20 faces the end facing surface 54 a that is one surface of the end plate 54 in the end cover member 50. . The first facing surface 26a is a surface facing the Z-axis upward direction in the first terminal flange 26, and the end facing surface 54a is a surface facing the Z-axis downward direction in the end plate 54.

  As shown to FIG. 4A, the 1st opposing surface 26a which opposes the edge part board 54 in the 1st terminal collar part 26 is repeatedly formed with the unevenness | corrugation from the inner periphery toward the outer periphery. More specifically, the first facing surface 26a is formed with a first recess 26aa that is a ring-shaped or partial ring-shaped recess surrounding the outer periphery of the shaft leg portions 62a and 62b of the core 60. Six first concave portions 26aa having different inner diameters are formed concentrically on the first facing surface 26a.

  Further, as shown in FIGS. 6A and 6B, an end convex portion 54aa that is a convex portion that engages with the first concave portion 26aa is formed on the end facing surface 54a that faces the first opposing surface 26a. . As shown in FIG. 3D and FIG. 6C, the end convex portion 54aa is formed to correspond to the first concave portion 26aa, and the end facing surface 54a has six end convex portions 54aa having different inner diameters. It is formed concentrically.

  As shown in FIGS. 2 and 4A, a terminal block 27 is formed at one end in the X-axis direction of the first terminal collar 26 in the first bobbin 20. The terminal block 27 protrudes from the first terminal flange 26 in the winding axis direction (Z-axis upward direction) of the first coil 72, and has a wall surface formed from the inner periphery to the outer periphery of the first terminal flange 26. A first side wall portion 291 is provided.

  As shown in FIG. 4A, the first side wall facing surface 291 a of the first side wall portion 291 in the first bobbin 20 faces the terminal protection facing surface 56 a of the terminal protection portion 56 in the end cover member 50. The first side wall facing surface 291a is a surface facing the X axis inward direction in the terminal block 27, and the terminal protection facing surface 56a is a surface facing the X axis outward direction in the terminal protection portion 56.

  As shown in FIG. 4A, unevenness is repeatedly formed on the first side wall facing surface 291a of the first side wall portion 291 facing the terminal protection portion 56 (see FIG. 2) from the inner periphery toward the outer periphery. More specifically, a first side wall recess 291aa is formed on the first side wall facing surface 291a so as to be connected (continuous) to the second recess 26aa. The first side wall recess 291aa is formed from one end in the Z-axis direction to the other end in the Z-axis direction of the first side wall facing surface 291a.

  Four first side wall recesses 291aa having different inner diameters are formed on the first side wall facing surface 291a in a substantially concentric shape (from the inner diameter toward the outer periphery). Further, as shown in FIGS. 6A and 6B, a terminal protection convex portion 56aa that is a convex portion that engages with the first side wall concave portion 291aa is formed on the terminal protection opposing surface 56a that faces the first side wall opposing surface 291a. ing. As shown in FIG. 3C, the terminal protection convex portion 56aa is formed so as to correspond to the first side wall concave portion 291aa, and the terminal protection facing surface 56a has four terminal protective convex portions 56aa having different inner diameters. It is formed concentrically (from the inner periphery toward the outer periphery).

  The depth (circumferential direction) of each first side wall recess 291aa formed on the first side wall facing surface 291a is preferably the same, but may be different and is not particularly limited, but preferably 1 mm or more. More preferably, it is 1-100 mm. The radial widths of the first side wall recesses 291aa are preferably all the same, but may be different and are not particularly limited, but are preferably 1 mm or more, more preferably 1 to 100 mm. The number of first side wall recesses 291aa formed on the first side wall facing surface 291a is not particularly limited, but is preferably 3 to 10 from the inside to the outside. As shown in FIG. 4A, the number of first recesses 26aa in the radial direction is larger than the number of first side wall recesses 291aa.

  It is preferable that the depth (circumferential direction) and the radial width of each first side wall recess 291aa are approximately the same as the Z-axis direction depth and the radial width of the first recess 26aa. 6A is designed in accordance with the depth (circumferential direction) and radial width of each first side wall concave portion 291aa shown in FIG. 4A. is there.

  Furthermore, the Z-axis protruding height and the radial width of the end protrusion 54aa shown in FIG. 6A are designed according to the Z-axis depth and the radial width of each first recess 26aa shown in FIG. 4A. Note that the relationship between the second side wall recess 292aa shown in FIG. 4A described later and the core guard projection 57aa shown in FIG. 6B is the relationship between the first side wall recess 291aa shown in FIG. 4A and the terminal protection projection 56aa shown in FIG. 6A. It is the same.

  As shown in FIG. 2 and FIG. 4A, a core fixing portion 25 is formed at the other end in the X-axis direction of the first terminal collar 26 in the first bobbin 20. The core fixing portion 25 protrudes from the first terminal flange portion 26 in the winding axis direction (Z-axis upward direction) of the first coil 72 and is formed from the inner periphery toward the outer periphery of the first terminal flange portion 26. The second side wall portion 292 having The core fixing portion 25 has a role of fixing the core 60a shown in FIG. 2 so as not to be displaced in the X-axis outward direction via the second side wall portion 292.

  As shown in FIG. 4A, the second side wall facing surface 292a of the second side wall portion 291 of the first bobbin 20 faces the core guard facing surface 57a (see FIG. 2) of the upper core guard portion 57 of the end cover member 50. The second side wall facing surface 292a is a surface facing the X-axis inner side in the core fixing portion 25, and the core guard facing surface 57a shown in FIG. 2 is a surface facing the X-axis outer side in the upper core guard portion 57.

  As shown to FIG. 4A, the 2nd side wall opposing surface 292a which opposes the upper core guard part 57 (refer FIG. 2) in the 2nd side wall part 292 has repeatedly formed the unevenness | corrugation from the inner periphery to the outer periphery. More specifically, a second side wall recess 292aa is formed on the second side wall facing surface 292a so as to be connected (continuous) to the second recess 26aa. The second side wall recess 292aa is formed from one end in the Z-axis direction to the other end in the Z-axis direction of the second side wall facing surface 292a.

  On the second side wall facing surface 292a, four second side wall recesses 292aa having different inner diameters are formed substantially concentrically (from the inner diameter toward the outer periphery). Further, as shown in FIG. 6B, a core guard convex portion 57aa which is a convex portion engaging with the second side wall concave portion 292aa is formed on the core guard opposing surface 57a facing the second side wall opposing surface 292a (FIG. 4A). Yes. The core guard convex portion 57aa is formed so as to correspond to the second side wall concave portion 292aa. On the core guard facing surface 57a, four core guard convex portions 57aa having different inner diameters are substantially concentric (from the inner circumference toward the outer circumference). ).

  As shown in FIG. 2, the second facing surface 24 a of the first flange 24 in the first bobbin 20 faces the partition facing surface 44 a that is one surface of the partition plate 44 in the center cover member 40. The second facing surface 24a is a surface facing the Z-axis downward direction in the first flange 24, and the partition facing surface 44a is a surface facing the Z-axis upward direction in the partition plate 44.

  As shown in FIG. 4C, unevenness is repeatedly formed on the second facing surface 24 a facing the partition plate 44 in the first flange portion 24 from the inner periphery toward the outer periphery. More specifically, the second facing surface 24a is formed with a second recessed portion 24aa which is a ring-shaped recessed portion surrounding the outer periphery of the shaft leg portions 62a and 62b of the core 60. Six second concave portions 24aa having different inner diameters are formed concentrically on the second facing surface 24a.

  In addition, as shown in FIG. 5, a partition convex portion 44aa that is a convex portion that engages with the second concave portion 24aa is formed on the partition facing surface 44a that faces the first facing surface 24a. The partition convex portion 44aa is formed to correspond to the second concave portion 24aa, and six partition convex portions 44aa having different inner diameters are formed concentrically on the partition facing surface 44a. The relationship between the second concave portion 24aa shown in FIG. 4C and the partition convex portion 44aa shown in FIG. 5 is the same as the relationship between each first concave portion 26aa shown in FIG. 4A and the end convex portion 54aa shown in FIG. 6A. .

  As shown in FIG. 3A, the outer periphery of the first cover 24, the intermediate cover 28, the first hollow tube portion 22, and the first coil 72 wound around the first outer peripheral wall 22 a It is surrounded by the outer peripheral cover part 42 which protrudes from the outer periphery of the 1st collar part 24 to Z-axis upper direction. Accordingly, the arrangement space 72b in which the first coil 72 is arranged is defined by the outer peripheral cover portion 42 with respect to the connection portions 64a and 64b of the core 60 passing through the outer periphery of the first bobbin 20 and the space outside the coil device 10. Separated.

  As shown in FIG. 5, outer peripheral openings 42 a and 42 b that connect from the space outside the coil device 10 to the arrangement space 72 b of the first coil 72 are formed in the outer peripheral cover portion 42 of the center cover member 40. The outer periphery cover part 42 is formed with an outer periphery opening 42a and an outer periphery opening 42b that open to the outside of the X axis.

  As shown in FIG. 5, a plurality of protrusions 42 c are formed around the outer peripheral openings 42 a and 42 b so as to protrude in the outer diameter direction from other portions of the outer peripheral cover portion 42. The protrusion 42c has a partial ring shape that is continuous in the outer circumferential direction. It is preferable that a plurality of protrusions 42 c are formed along the Z-axis direction between the outer peripheral openings 42 a and 42 b and the outer peripheral edge of the partition plate 44. A gap is formed between adjacent protrusions 42c.

  As shown in FIG. 1B, the first coil end portion 72a, which is the end portion of the first coil 72, passes through the outer peripheral opening 42a provided in one portion of the outer peripheral cover portion 40 in the X-axis direction and is disposed in the space. 72b (see FIG. 3A). As shown in FIG. 2, the terminal block 27 of the first bobbin 20 is provided with a terminal 82 for fixing the first coil end 72a, and the first coil end 72a drawn from the outer peripheral opening 42a is Connected and fixed to terminal 82.

  As shown in FIG. 1B, the first coil end 72a can be fixed, for example, by crimping the terminal 82 to the first coil end 72a, but the first coil end 72a and the terminal 82 are fixed. Is not particularly limited. As shown in FIG. 2, the terminal 82 is fixed to the first terminal flange 26 with a bolt, a nut, or the like, but the method of attaching the terminal 82 to the first bobbin 20 is not particularly limited.

  As shown in FIG. 2, the second bobbin 30 includes a ring-shaped second collar 34 disposed at the end of the second bobbin 30 in the Z-axis upward direction, and the Z-axis from the inner periphery of the second collar 34. It has the 2nd hollow cylinder part 32 which protrudes below and is connected to the center through-hole 44c. Further, the second bobbin 30 has a second terminal flange 36 that protrudes in the outer diameter direction from the end of the second hollow cylindrical portion 32 in the Z-axis lower direction.

  Further, an intermediate flange portion 38 protruding in the outer diameter direction from the second outer peripheral wall 32a is provided at the center portion (between the second flange portion 34 and the second terminal flange portion 36) in the Z-axis direction of the second hollow cylinder portion 32. Is provided. The intermediate collar part 38 includes a first intermediate collar part 381, a second intermediate collar part 382, a third intermediate collar part 383, and a fourth intermediate collar part 384.

  As shown in FIG. 3A, a second coil 74 is wound around a second outer peripheral wall 32 a that is an outer peripheral wall of the second hollow cylinder portion 32.

  As shown in FIG. 3B, the second flange 34 in the second bobbin 30 faces the partition plate lower surface 44 b that is the other surface of the partition plate 44 in the center cover member 40. The partition plate lower surface 44b is a surface of the partition plate 44 that faces downward in the Z-axis. Although the second flange 34 is in contact with the partition plate 44, unlike the first flange 24 of the first bobbin 20, the outer periphery is not surrounded by the central cover member 40.

  On the other hand, as shown in FIGS. 2 and 3A, a second cover member 92 a that separates the second coil 74 and the connection portion 64 b of the core 60 is attached to the outer periphery of the second bobbin 30. The second cover member 92 a is provided at two locations on both sides in the Y-axis direction close to the connection portion 64 b of the core 60 on the outer periphery of the second bobbin 30.

  As shown in FIG. 3B, the second coil end 74 a that is the end of the second coil 74 is connected and fixed to a terminal 84 provided on the second terminal flange 36 of the second bobbin 30. The fixing method for fixing the second coil end portion 74a to the terminal 84 is not particularly limited as is the case with the first coil end portion 72a.

  Although the manufacturing method of the coil apparatus 10 is not specifically limited, For example, it manufactures with the following method.

  First, the first bobbin 20 having the terminal 82 provided on the terminal block 27 of the first terminal collar 26 shown in FIG. 2 is prepared, and the first coil 72 is formed by winding a wire around the first outer peripheral wall 22a. The first coil end 72 a is fixed to the terminal 82. Separately, a second bobbin 30 having a terminal 84 provided on the second terminal flange 36 is prepared, and a second coil 74 is formed by winding a wire around the second outer peripheral wall 32a. The end 74 a is fixed to the terminal 84.

  Although it does not specifically limit as a material of the 1st bobbin 20 and the 2nd bobbin 30, It forms with insulating materials, such as resin, For example, it is preferable from viewpoints, such as heat resistance and intensity | strength, using a phenol resin. The wire used to form the first coil 72 and the second coil 74 is not particularly limited as long as the surface is a covered wire with an insulation coating. For example, the coil device 10 is used as a step-up transformer. Is the secondary coil on the high voltage side and the second coil 74 is used as the primary coil on the low voltage side, the first coil 72 having a relatively high voltage and low current uses a wire having a smaller diameter than the second coil 74. Can be formed.

  Next, the first bobbin 20 formed with the first coil 72 is inserted into the central cover member 40, and the first flange 24 of the first bobbin 20 is placed on the Z axis with respect to the partition plate 44 of the central cover member 40. Contact from the direction side. Then, the second recess 24aa formed on the second facing surface 24a of the second collar 24 is engaged with the partition projection 44aa formed on the partition facing surface 44a of the partition plate 44, and the first collar 24 is fixed to the partition plate 44.

  Further, the second bobbin 30 on which the second coil 74 is formed is brought closer to the central cover member 40 from the lower side of the Z collar, and the second flange 34 of the second bobbin 30 is moved to the partition plate 44 of the central cover member 40. Against the lower side of the Z axis. Thereby, the 1st bobbin 20 and the 2nd bobbin 30 are connected on both sides of the center cover member 40.

  Further, the end cover member 50 is brought closer to the center cover member 40 containing the first bobbin 20 from the upper side of the Z axis, and the end plate 54 of the end cover member 50 and the first terminal collar of the first bobbin 20 are moved. 26 is brought into contact.

  Then, the first recess 26aa formed on the first facing surface 26a of the first terminal collar 26 is engaged with the end convex portion 54aa formed on the end facing surface 54a of the end cover member 50. . Further, a first side wall recess 291aa formed on the first side wall facing surface 291a of the first side wall portion 291 in the terminal block 27 is formed on the terminal protection facing surface 56a of the terminal protecting portion 56 in the end cover member 50. It is made to engage with a certain terminal protection convex part 56aa.

  Further, a second side wall recess 292aa formed on the second side wall facing surface 292a of the second side wall portion 292 in the core fixing portion 25 is formed on the core guard facing surface 57a of the upper core guard portion 57 in the end cover member 50. Engage with a certain core guard projection 57aa. As described above, the end cover member 50 is fixed to the first terminal flange 26.

  A second cover member 92 a is attached to the second bobbin 30. The materials of the center cover member 40, the end cover member 50, and the second cover member 92a are not particularly limited, and are formed of an insulating material such as a resin.

  Next, with respect to the combined first bobbin 20 and second bobbin 30, the shaft leg portion 62 a of the first core 60 a of the core 60 is moved from the upper side of the Z axis to the first hollow cylinder portion 22 of the first bobbin 20. The shaft leg portion 62b of the second core 60b is inserted into the second hollow cylinder portion 32 from the lower side of the Z collar, thereby allowing the shaft leg portions 62a and 62b and the side leg portions 64ab and 64bb to be centered. Match. Finally, the coil device 10 shown in FIG. 1A is obtained by winding the insulating tape 12 around the outer periphery of the core 60.

  In the coil device 10 according to the present embodiment, as shown in FIGS. 4A and 6A, the first side wall facing surface 291a of the first side wall portion 291 in the first terminal collar portion 26 and the terminal protection facing surface in the terminal protection portion 56 are provided. Concavities and convexities (a first side wall concave portion 291aa and a terminal protection convex portion 56aa) that engage with each other are formed between the concave portions 56a. Further, the concave and convex portions (second side wall concave portion 292aa and core guard) that engage with each other between the second side wall facing surface 292a of the second side wall portion 292 in the first terminal collar portion 26 and the core guard facing surface 57a in the upper core guard portion 57. Convex part 57aa) is formed.

  Therefore, in the side wall facing surfaces 291a and 292a or the terminal protection facing surface 56a and the core guard facing surface 57a, the insulation distance (creeping distance and spatial distance) between the first coil 72 and the (shaft leg 62a) of the core 60a is extended. be able to. Therefore, the insulation distance between the first coil 72 and the core 60a can be appropriately ensured without increasing the outer shape of the side wall portions 291, 292 or the terminal protection portion 56 and the upper core guard portion 57. The insulation between the one coil 72 and the core 60a can be suitably secured.

  Further, in the coil device 10 according to the present embodiment, as shown in FIGS. 4A and 6B, a gap is formed between the first facing surface 26 a of the first terminal collar 26 and the end facing surface 54 a of the end plate 54. The concave and convex portions (the first concave portion 26aa and the end convex portion 54aa) that engage with each other are formed. Therefore, the insulation distance (creeping distance and spatial distance) between the first coil 72 and the core 60a (shaft leg portion 62a) can be extended on the first facing surface 26a and the end facing surface 54a. Therefore, it is possible to appropriately secure an insulation distance between the first coil 72 and the core 60a without increasing the outer shape of the first terminal flange 26 and the end plate 54. The insulation between the cores 60a can be suitably secured.

  Further, in the coil device 10 according to the present embodiment, as shown in FIGS. 4C and 5, there is a mutual engagement between the second facing surface 24 a in the first flange portion 24 and the partition facing surface 44 a in the partition plate 44. Concavities and convexities (second concave portion 24aa and partition convex portion 44aa) to be combined are formed. Therefore, the insulation distance (creeping distance and spatial distance) between the first coil 72 and the core 60a (shaft leg portion 62a) can be extended on the second facing surface 24a and the partition facing surface 44a. Therefore, it is possible to appropriately secure an insulation distance between the first coil 72 and the core 60a without increasing the outer shape of the first flange 24 and the partition plate 44, and the first coil 72 and the core 60a. It is possible to suitably ensure insulation between the two.

  In the present embodiment, since the center cover member 40 is disposed between the first bobbin 20 and the second bobbin 30, the insulation distance between the first coil 72 and the second coil 74 is effectively extended. Small size and excellent insulation properties. Thereby, the coil apparatus 10 can realize a small coil apparatus having a large potential difference between the first coil 72 and the second coil 74. For example, in the conventional bobbin structure in which the first bobbin and the second bobbin are continuous, even if the cover is attached from the outer peripheral side of the coil, a path is formed in the gap between the flange and the cover. Therefore, it has been difficult to extend the insulation distance between the first coil and the second coil unless the collar portion is enlarged to sacrifice the size reduction of the coil device 10.

  However, in the central cover member 40 of the coil device 10, as shown in FIGS. 3A and 3B, a partition plate 44 extending in the outer diameter direction, and an outer peripheral cover portion 42 extending in the Z-axis upward direction from the outer peripheral edge of the partition plate 44. Is continuous without gaps. Therefore, the first coil 72 and the second coil can be obtained without increasing the outer diameters of the first flange 24 and the second flange 34 by the center cover member 40 having the partition plate 44 and the outer peripheral cover 42. It is possible to extend the insulation distance (especially the spatial distance) from 74. Further, by providing the plurality of protrusions 42 c on the outer peripheral cover part 42, the insulation distance (particularly the creepage distance) between the first coil 72 and the second coil 74 can be further extended.

  Also, as shown in FIGS. 3B and 5, the first coil end 72a of the first coil 72 is wired to the terminal 82 through the outer peripheral opening 42a, whereby the first coil 72 and the second coil 74 are connected. An insulation distance can be secured appropriately. Further, the outer peripheral openings 42 a and 42 b have an effect of promoting the heat radiation of the first coil 72.

  In the present embodiment, as shown in FIG. 2, the center cover member 40 has a hollow cylindrical portion 46 that protrudes in the Z 舳 upward direction and the Z 舳 downward direction from the edge of the central through hole 44c. The hollow cylinder portion 46 contributes to the extension of the insulation distance between the shaft leg portion 62 a of the core 60 and the first coil 72.

  Further, as shown in FIG. 3B, the outer peripheral cover portion 42 extending in the Z-axis upward direction from the outer peripheral edge of the partition plate 44 between the first coil 72 and the connecting portion 64 a (particularly the side leg portion 64 ab) of the core 60. And the side cover part 52 extended in the Z-axis lower side from the outer periphery of the end part board 54 is arrange | positioned. With such a structure, the coil device 10 extends the insulation distance between the first coil 72 and the connecting portion 64a of the core 60, and exhibits good insulation characteristics.

  The coil device 10 shown in the embodiment is a step-up transformer in which the second coil 74 is a low-voltage-side primary coil and the first coil 72 is a high-voltage-side secondary coil. Is longer than the insulation distance between the second coil 74 and the core 60. However, the vertical positional relationship (in the Z-axis direction) between the first bobbin 20 and the first coil 72, the second bobbin 30 and the second coil 74 in the coil device 10 may be reversed.

  Further, as shown in FIG. 3B, the end cover member 50 attached from the upper side of the Z-axis to the first bobbin 20 has a terminal protection part 56 that separates the terminal 82 and the core 60. The coil device 10 can extend the insulation distance between the core 60, the first coil 72, and the terminal 82, and exhibits suitable insulation characteristics.

  Although the coil device according to the present invention has been described with reference to the embodiment, the above-described embodiment is merely an example of the present invention, and the first bobbin 20, the second bobbin 30, the center cover member 40, and the end cover member 50 are described. The shape can be changed as appropriate according to the application of the coil device and the like.

  For example, in the coil device 10 described above, as shown in FIGS. 4A and 6A, the side wall recess 291aa is formed on the first side wall facing surface 291a, and the terminal protection convex portion 56aa is formed on the terminal protection facing surface 56a. However, the convex portion and the concave portion may be reversed. That is, in the coil device according to another embodiment, a side wall convex portion that is a substantially concentric convex portion may be formed on the first side wall facing surface 291a, and the side wall convex portion engages with the terminal protection facing surface 56a. A terminal protection recess may be formed.

  Further, in the coil device 10 described above, as shown in FIGS. 4A and 6B, the first concave surface 26aa is formed on the first opposing surface 26a, and the end convex portion 54aa is formed on the end opposing surface 54a. However, the convex portion and the concave portion may be reversed. That is, in the coil device according to another embodiment, a first convex portion that is a substantially concentric convex portion may be formed on the first facing surface 26a, and the first convex portion is engaged with the end facing surface 54a. An end recess may be formed.

  In the coil device 10 described above, as shown in FIGS. 4C and 5, the second concave surface 24aa is formed on the second facing surface 24a, and the partition convex portion 44aa is formed on the partition facing surface 44a. The convex part and the concave part may be reversed. That is, in the coil device according to another embodiment, a second convex portion that is a ring-shaped convex portion that surrounds the shaft leg portions 62a and 62b may be formed on the second opposing surface 24a, and the second opposing surface 44a may include a second convex portion. The partition recessed part which 2 convex parts engage may be formed.

  As shown in FIG. 3A, in the coil device 10, an uneven shape is not formed between the second flange portion 34 of the second bobbin 30 and the partition plate 44, but the second flange portion 34 and the partition plate are not formed. An uneven shape similar to the facing surface of the first flange 24 and the partition plate 44 may be formed between the first flange 24 and the partition plate 44.

DESCRIPTION OF SYMBOLS 10 ... Coil apparatus 12 ... Insulating tape 20 ... 1st bobbin 22 ... 1st hollow cylinder part 24 ... 1st collar part 24a ... 1st opposing surface 24aa ... 1st recessed part 25 ... Core fixing | fixed part 26 ... 1st terminal collar part 26a ... 1st opposing surface 26aa ... 1st recessed part 291 ... 1st side wall part 291a ... 1st side wall opposing surface 291aa ... 1st side wall recessed part 292 ... 2nd side wall part 292a ... 2nd side wall opposing surface 292aa ... 2nd side wall recessed part 30 ... 2nd bobbin 32 ... 2nd hollow cylinder part 34 ... 2nd collar part 36 ... 2nd terminal collar part 28, 38 ... Intermediate collar part 281, 381 ... 1st intermediate collar part 282,382 ... 2nd intermediate collar part 283, 383 ... Third intermediate flange 40 ... Center cover member 42 ... Outer cover portions 42a, 42b ... Outer opening 42c ... Projection 44 ... Partition plate 44a ... Partition facing surface 44aa ... Partition convex portion 44b ... Partition plate lower surface 44c ... Center through DESCRIPTION OF SYMBOLS 50 ... End part cover member 52 ... Side cover part 54 ... End part plate 54a ... End part opposing surface 54aa ... End part convex part 54c ... End part through-hole 56 ... Terminal protection part 56a ... Terminal protection opposing surface 56aa ... Terminal protection Convex part 57 ... Upper core guard part 57a ... Core guard facing surface 57aa ... Core guard convex part 60 ... Core 72 ... First coil 72a ... First coil end part 74 ... Second coil 74a ... Second coil end part 92a ... Second cover member

Claims (6)

A hollow cylindrical first hollow tube portion around which a first coil is wound on the outer periphery, a terminal flange projecting outward from one end of the first hollow tube portion, and from the terminal flange, the first coil A first bobbin having a side wall portion protruding in the winding axis direction and having a wall surface extending from the inner periphery of the terminal flange toward the outer periphery;
A shaft leg portion inserted through the inside of the first hollow cylinder portion, and a core having a connection portion connected to one end of the shaft leg portion through an outer peripheral side of the first bobbin;
The wall surface of the side wall portion, toward the outer periphery from the inner periphery of the side wall portion, Ri irregularities repeatedly formed tare,
The coil device , wherein the unevenness is formed from one end of the side wall portion to the other end along the winding axis direction . An end cover member having a vertical portion disposed between the side wall portion and the connection portion;
2. The coil device according to claim 1, wherein unevenness engaging with the unevenness formed on the wall surface of the side wall portion is repeatedly formed on a side surface of the vertical portion facing the side wall portion. The end cover member has an end plate disposed between the terminal flange and the connection portion;
On the first facing surface facing the end plate in the terminal collar, irregularities are repeatedly formed from the inner periphery to the outer periphery of the terminal collar,
The end surface facing said terminal flange portion of the end plate, to claim 2, characterized in that irregularities which engages with irregularities is formed on the first opposing surface are repeatedly formed The coil apparatus of description. It further has a center cover member having a partition plate with a through hole formed in the center,
The first bobbin has a first flange portion that protrudes from the other end of the first hollow cylinder portion in the outer shape direction and faces one surface of the partition plate;
On the second facing surface that faces the partition plate in the first flange, irregularities are repeatedly formed from the inner periphery to the outer periphery of the first flange,
4. The unevenness engaging the unevenness formed on the second facing surface is repeatedly formed on the partitioning facing surface of the partitioning plate facing the first flange portion. The coil device according to claim 1.   The coil device according to any one of claims 1 to 4, wherein the side wall portion is formed on a terminal block provided with a terminal for fixing an end portion of the first coil.   The coil device according to any one of claims 1 to 5, wherein the side wall portion is formed in a core fixing portion that faces the connecting portion and fixes the core.

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