JPH08203722A - Coil device - Google Patents

Abstract

PURPOSE: To increase the number of turns of a coil without lowering dielectric strength. CONSTITUTION: In a coil device which is provided with an iron core 1, an insulating tape 2 which is pasted with and wound up around the middle part 1a of the iron core 1, a coil 4 wound up on the insulating tape 2 and a coil frame 3 formed on both ends of the iron core 1 so as to regulate a coil winding pace in the longitudinal direction, the coil frame 3 is formed in such a structure that it may cover both ends 2d along the wining direction of the insulating tape 2. Therefore, since the coil 4 is wound up around the iron core 1 by way of the insulating tape 2 whose thickness is reducible than a molded body, the number of turns of the coil is increased while both ends of the insulating tape 2 in the winding direction is buried inside the coil frame 3, which prevents the generation of a separated space in a boarding area with the coil frame 3 and maintaining an insulation distance between the coil 4 and the iron core 1 with its internal embedded area.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coil device in which a coil is wound on an insulating tape wound around an intermediate portion of an iron core.

[0002]

2. Description of the Related Art In the conventional coil device, as shown in FIGS. 7 and 8, when a coil B is wound around an intermediate portion A ₁ of an iron core A, it is usually formed by covering the intermediate portion A _1. The coil frame C is wound via the winding barrel C ₁ .

In this case, the coil frame C is a molded body,
Therefore, the winding body C ₁ needs to have a wall thickness of at least about 0.3 mm or more so that the molding resin can flow, and the number of windings of the coil B is reduced by the wall thickness so that the so-called magnetic efficiency is poor. Becomes

Therefore, as shown in FIGS. 9 and 10, the coil frame C is integrally formed on both ends of the iron core A so as to regulate the winding space of the coil B in the longitudinal direction of the iron core A. In addition, the insulating tape D having a thickness of about 0.05 mm is wound around the exposed middle portion of the iron core A, and the coil B is attached to the insulating tape D.
There is a structure that is wound on top.

[0005]

9 and 10 described above.
In the conventional coil device shown in, coil B is an iron core.
Since it is wound on the insulating tape D having a thickness of about 0.05 mm, which is affixed to the middle part of A, the coil frame C of the molded body having a wall thickness of at least about 0.3 mm or more is wound. The number of turns is increased by about 0.25 mm, which is the difference in thickness, compared with the conventional one shown in FIGS. 7 and 8 which is wound via the body C ₁ , and the so-called magnetic efficiency is improved.

However, when the insulating tape D is wound and pasted on the exposed middle portion of the iron core A, both end edges D ₁ along the winding direction are superposed on the coil frame C so that no exposed portion remains. Even when wound, as shown in FIG. 9, both end edges D ₁ are coil frames.
If there is a part that peels off at the boundary with C, the insulation distance between the coil B wound around the insulation tape D and the iron core A may be insufficient, and the dielectric strength performance may not be ensured. .

The present invention has been made in view of the above circumstances, and an object thereof is to provide a coil device capable of increasing the number of coil windings without deteriorating the dielectric strength performance.

[0008]

In order to solve the above-mentioned problems, according to a first aspect of the present invention, an iron core, an insulating tape wound around an intermediate portion of the iron core, and wound on the insulating tape. A coil device comprising: a coil to be rotated; and coil frames respectively formed at both ends of the iron core so as to regulate a coil winding space in a longitudinal direction of the iron core, wherein the coil frame is the insulating tape. Is formed so as to cover both edges along the winding direction.

According to a second aspect of the present invention, in the first aspect, the iron core has a substantially circular cross section.

According to a third aspect of the present invention, in the first aspect, the coil is wound in the same direction as the winding direction of the insulating tape.

According to a fourth aspect of the present invention, in the first aspect, the coil frame is integrally formed with the insulating tape wound around the iron core. .

According to a fifth aspect of the present invention, in the coil frame according to the fourth aspect, the resin molding direction at the winding end edge of the insulating tape in the coil frame is the same as the winding direction of the insulating tape. They have the same configuration.

[0013]

According to the first aspect of the present invention, the coil is wound around the iron core through the insulating tape which can be made thinner than the molded body, so that the number of windings increases and the winding of the insulating tape increases. Since both edges along the direction are buried inside the covered coil frame, there is no place where it peels off at the boundary with the coil frame, and the insulation distance between the coil and the iron core Is also secured by the part buried inside.

According to the second aspect of the present invention, the insulating tape has a cross section different from that of a rectangular cross section in which the outer peripheral surfaces of the iron cores to be wound and attached suddenly change at the portions orthogonal to each other. Since it is applied by winding along a substantially circular outer peripheral surface with a certain gradual change, it is difficult to peel off in the middle of the winding direction.

According to the third aspect of the present invention, the winding end edge of the insulating tape is adapted to follow the winding tension of the coil and therefore cannot be peeled off.

According to the fourth aspect of the present invention, the coil frame is integrally molded and simultaneously covers both end edges along the winding direction of the insulating tape, without being purposely manufactured as a separate member.

According to the fifth aspect of the present invention, when the coil frame is integrally molded, the winding end edge of the insulating tape follows the flow of the molding resin in the same direction as the winding direction of the insulating tape. It does not come off because it is

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. The coil device 10 in this example is used for an electromagnetic relay and includes an iron core 1 and an insulating tape.
2. It has a coil frame 3 and a coil 4.

The iron core 1 is made of a magnetic material and is formed in a U-shape with an intermediate portion 1a having a rectangular cross section and opposing portions 1b and 1c.

As shown in FIG. 3, the insulating tape 2 is composed of an insulating sheet 2a formed of an insulating material such as polyester resin and having a plate thickness of about 0.025 mm, and one of the insulating sheet 2a. It is composed of an adhesive layer 2b applied on the side of the winding with a thickness of about 0.025 mm. As shown in FIG. 2, the winding end edge 2c is superposed on the winding start edge, and the middle portion of the iron core 1 is attached.
One turn is attached to 1a, and the total thickness of the insulating sheet 2a and the adhesive layer 2b is about 0.05 mm except for the winding end edge 2c which is attached by superposition.

The coil frame 3 is integrally formed with the insulating tape 2 wound around the iron core. Specifically, the coil frame 3 is embedded while covering both end edges 2d along the winding direction of the insulating tape 2, and Exposing the ends of the opposing parts 1b and 1c of the core 1,
The iron core 1 is formed at each of both ends of the intermediate portion 1a so as to regulate the winding space of the coil 4 in the longitudinal direction.

At the time of integrally molding, as shown by the arrow in FIG. 2, the iron core 1 is so arranged that the direction of the molding resin at the winding end edge 2c of the insulating tape 2 is the same as the winding direction of the insulating tape 2. A concave portion 3a for forming a mold for narrowing the resin flow path on the opposite side of the winding end edge 2c with respect to the intermediate portion 1a is formed, whereby the winding end edge 2c of the insulating tape 2 is made of resin. It is designed so that it cannot be peeled off by injection pressure.

The coil 4 is wound on the insulating tape 2 in the winding space regulated by the coil frames 3 and 3, and the winding direction is the same as the winding direction of the insulating tape 2. As a result, the insulating tape 2 is more strongly attached to the outer peripheral surface of the iron core 1.

As shown in FIG. 5 (a), the coil device 10 has a rectangular parallelepiped permanent magnet between the facing portions 1b and 1c of the iron core 1.
5, the coil 4 is integrally molded together with the terminal block 6 so as to be covered with the molded body 7 made of synthetic resin, as shown in FIG.

The terminal block 6 is a common contact terminal 62 having a fixed contact terminal 61 having a fixed contact 61a at its base end and a fixing piece 62a for fixing a hinge spring piece 9a of a contact spring 9 which will be described later. And a coil terminal 63 for energizing the coil 4, and two fixed contact terminals 61, 1 on both sides of the molded body 7.
Two common contact terminals 62 and two coil terminals 63 are respectively implanted. At this time, fixed contact 61a and common contact terminal
The fixed piece 62a of 62 is exposed from the molded body 7. Then, after the integral molding, the terminals exposed from the molded body 7 are bent along the side surface of the molded body 7.

Then, as shown in FIG. 6, an armature block 11 is provided. In this armature block 11, contact springs 9 are integrally formed on both sides of a plate-shaped armature 8 via synthetic resin. A movable contact 9b is fixed to both ends of the contact spring 9, and a hinge spring piece 9a projects from one side portion of the central portion. And armature 8
On the permanent magnet 5 with a ridge formed in the center of the lower surface as a fulcrum, and both ends are sucked and released by the facing portions 1b and 1c of the iron core 1 to move. The contact point 9b contacts and separates from the fixed contact point 61a, and the hinge spring piece 9a is fixed to the fixing piece 62a of the common contact terminal 62, whereby the contact spring 9 is electrically connected to the common contact terminal 62. At this time, as described above, since the coil 4 is covered with the molded body 7, the coil 4 is sufficiently insulated from the charged portion such as the contact spring 9 and the armature block 11 is provided. When doing so, do not damage the coil 4 and disconnect it. Then, when the cover 12 is attached, an electromagnetic relay can be formed.

In the coil device 10, as described above, the coil 4 is the insulating tape 2 which can be made thinner by about 0.25 mm than that of the molded body having a wall thickness of at least about 0.3 mm. Since it is wound around the intermediate portion 1a of the iron core 1 by increasing the number of windings, the magnetomotive force per unit power consumption applied to the coil 4, so-called magnetic efficiency, is improved and the winding direction of the insulating tape 2 is increased. Since both end edges 2d along the line are embedded in the covered coil frame 3, there is no place where they are peeled off at the boundary with the coil frame 3, and moreover, the coil 4 and the iron core 1 are not separated from each other. The insulation distance between them is also secured by the portion buried inside, and the dielectric strength performance can be maintained.

Further, the coil frame 3 is integrally molded at the same time as an insulating tape without being purposely manufactured as a separate member.
It covers both edges 2d along the winding direction of 2.

In addition, when the coil frame 3 is integrally molded, the flow direction of the molding resin and the winding direction of the coil 4 are the insulating tape 2.
Since the winding direction is the same as the winding direction, the winding end edge 2c of the insulating tape 2 follows the flow of the molding resin and the winding tension of the coil 4, and is more difficult to peel off.

In the present embodiment, the cross section of the intermediate portion 1a of the iron core 1 is rectangular, and when the insulating tape 2 is wound and attached, the outer peripheral surfaces of the intermediate portion 1a suddenly change at the portions orthogonal to each other. However, if the cross section of the intermediate portion 1a is substantially circular, the tape is wound and adhered with a constant gradual change along the outer peripheral surface, so that it is more difficult to peel off in the middle of the winding direction.

Further, in this embodiment, the flow direction of the molding resin and the winding direction of the coil 4 when the coil frame 3 is integrally molded are the same as the winding direction of the insulating tape 2. When the number of windings of the coil 4 is large and the number of windings of the insulating tape 2 is 2 turns or more and the thickness may be slightly thick, the winding end edge 2c of the insulating tape 2 is easily peeled off, The winding direction of the insulating tape 2 may be opposite to the winding direction.

Further, in this embodiment, the coil frame 3 is an iron core.
It is formed by integral molding together with the insulating tape 2 that is wound and affixed to 1.However, for example, when the mold becomes complicated, the iron core 1 that is affixed with the insulating tape 2 is applied in the plate thickness direction. Alternatively, the pair of coil frames that are fitted to each other in a state of being sandwiched from both sides and are in the state shown in FIG. 1 may be separately molded as separate members.

[0033]

According to the present invention, since the coil is wound around the iron core through the insulating tape which can be made thinner than the molded body, the number of windings is increased and the insulating tape is wound. Since both edges along the direction are buried inside the covered coil frame, there is no place where it peels off at the boundary with the coil frame, and the insulation distance between the coil and the iron core Is also secured by the part buried inside, and the dielectric strength performance can be maintained.

In addition to the effect of the first aspect, the insulating tape of the second aspect has a rectangular cross section in which the outer peripheral surfaces of the iron cores to be wound and attached suddenly change at the portions orthogonal to each other. Unlike such a case, since the tape is wound and attached along the outer peripheral surface having a substantially circular cross-section with a constant gradual change, it is difficult to peel off in the middle of the winding direction.

According to a third aspect of the present invention, in addition to the effect of the first aspect, the winding end edge of the insulating tape is
It follows the winding tension of the coil and does not come off easily.

Further, in addition to the effects of the first aspect, the coil frame according to the fourth aspect is integrally formed at the same time as the winding direction of the insulating tape, without the purpose of producing the coil frame as a separate member. It will cover both edges.

According to a fifth aspect of the invention, in addition to the effects of the fourth aspect, when the coil frame is integrally molded,
The winding end edge of the insulating tape follows the flow of the molding resin in the same direction as the winding direction of the insulating tape, and is difficult to peel off.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part showing an embodiment of the present invention.

FIG. 2 is an X-X sectional view of the above.

FIG. 3 is an enlarged sectional view of a main part of the above.

FIG. 4 is a perspective view of the above.

FIG. 5 is a perspective view showing a block state during assembly into the above electromagnetic relay.

FIG. 6 is an exploded perspective view of the above electromagnetic relay.

FIG. 7 is a cross-sectional view of a main part of a conventional example.

FIG. 8 is a perspective view of the above.

FIG. 9 is a sectional view of a main part of another conventional example.

FIG. 10 is a perspective view of the same.

[Explanation of symbols]

 1 Iron core 1a Middle part 2 Insulation tape 2c Winding end edge 2d End edge 3 Coil frame 4 Coil

Claims (5)

[Claims] 1. An iron core, an insulating tape wound around an intermediate portion of the iron core, a coil wound on the insulating tape, and an iron core for controlling a coil winding space in the longitudinal direction of the iron core. A coil device comprising: coil frames formed at both ends of a core, wherein the coil frame is formed so as to cover both end edges along the winding direction of the insulating tape. Coil device. 2. The coil device according to claim 1, wherein the iron core has a substantially circular cross section. 3. The coil is wound in the same direction as the winding direction of the insulating tape.
The described coil device. 4. The coil device according to claim 1, wherein the coil frame is integrally formed with the insulating tape wound around the iron core. 5. The coil device according to claim 4, wherein in the coil frame, a resin flow direction of integrally molding at a winding end edge of the insulating tape is the same as a winding direction of the insulating tape.