JPH0632656Y2 - Toroidal coil device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial field of application) The present invention is, for example, an electromagnetic interference noise generated in an electronic device and transmitted to a power supply line, or an electromagnetic interference noise penetrating into the electronic device from the power supply line. The present invention relates to a toroidal coil device used for a line filter used for a device using a three-phase power source, among the line filters used for suppressing the noise.

(Prior Art) For example, in the field of electromagnetic interference noise prevention line filters, a toroidal coil in which a winding is wound around an annular magnetic core is placed in a vertical position, and then the toroidal coil is semi-submerged in a box-shaped storage case. There is known a toroidal coil device which is stored and mounted on another circuit board through the housing case.

As a toroidal coil device of such a type, there is one shown in FIG. 5 (a). In the figure, 1 is an annular core,
3 is a storage case.

The illustrated annular magnetic core 1 is provided with flange portions 1a and 1b projecting at positions where the annular magnetic core 1 is divided into two parts.
Two windings 2 and 4 are respectively wound in the section divided by b.

On the other hand, the storage case 3 is formed with a semicircular recess 3e corresponding to the outer shape of the annular magnetic core 1, and both ends 2a, 2b, 4a, 4b of the windings 2, 4 are formed at the bottom of the recess 3e. It is assumed that the through holes 3a to 3d to be penetrated are formed. In this way, both ends of the winding are led out from inside the storage case to outside the storage case.

(Problems to be Solved by the Invention) By the way, the collar portions 1a and 1b formed on the annular magnetic core 1 are described.
Is an essential element in the sense that the insulation distance between the windings 2 and 4 is ensured. Therefore, when it is desired to increase the number of windings to be wound around the annular magnetic core 1, The number also needs to increase accordingly.

However, when the annular magnetic core 4 having the three collar portions 4a to 4c as shown in FIG. 4B is combined with the above-mentioned storage case, the collar portions 4b and 4c become obstacles.
There arises a problem that the end of the winding cannot be penetrated into the through hole formed in the bottom of the recess of the storage case. In this case, it is necessary to cover the ends of the windings 4d and 4e with an insulating tube or to wire the ends of the windings outside the storage case. However, this causes a decrease in workability and the reliability of the device. It may cause a decline.

Further, since the annular magnetic core and the storage case are fixed with an adhesive, there is a problem that they are peeled off by vibration or the like.

Therefore, an object of the present invention is to provide a toroidal coil device in which the end of each winding can be derived from the housing case even when three windings are wound, and the annular magnetic core does not separate from the housing case due to vibration or the like.

[Structure of the Invention] (Means for Solving the Problems) According to the structure of the present invention for achieving the above-mentioned object, a collar portion is provided at a position where the annular magnetic core is divided into three parts, and windings are respectively provided between the collar portions. A toroidal coil around which a wire is wound and a part of an annular magnetic core including the at least two collars are housed,
In addition, the coil storage case is characterized in that the coil storage case is formed on a side wall of a winding terminal lead-out portion that positions the terminal of each winding and draws it out in one direction. In this case, the winding terminal lead-out portion preferably includes a guide portion for guiding the end portion of each winding and a support portion for each of the guided windings. Further, it is preferable that the coil storage case is provided with a separation preventing portion that prevents separation of the stored toroidal coil.

(Operation) The operation of the present invention having the above-described configuration is that the winding terminal lead-out portion is provided on the side wall of the coil housing case that houses the three-divided annular magnetic core, and Each terminal can be drawn out in one direction from the coil storage case. In this case, if the winding terminal lead-out portion includes a guide portion that guides the terminal portion of each winding and a support portion for each of the guided windings, the winding terminal can be easily led out. Further, the disengagement prevention portion provided on the coil storage case enables the toroidal coil and the coil storage case to be engaged easily and reliably.

(Example) Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 is an external perspective view of a toroidal coil device as one embodiment, and FIG. 2 is an exploded perspective view of the toroidal coil device shown in FIG.

The toroidal coil device shown in FIGS. 1 and 2 is provided with collar portions 5a to 5c at positions where the annular magnetic core 5 is divided into three parts, and windings 6 to 8 are respectively provided between the collar portions 5d to 5f. The wound toroidal coil 9 and a part of the annular magnetic core 5 including the at least two collar portions 5b and 5c are housed, and each end of each winding 6 to 8 is positioned and led out in one direction. The winding terminal lead-out portions 10 and 11 have a coil storage case 12 formed on the side walls 12e and 12g.

The toroidal coil 9 has an annular ferrite core 13
And core cases 14 and 15 made of synthetic resin for accommodating the ferrite core 13 therein, and the core case 1
The windings 6 to 8 are wound in the toroidal direction in a combined state of 4 and 15.

Of these, the core cases 14 and 15 are annular cases capable of sealing the ferrite core 13 inside when they are coupled to each other, and the core case 14 and 15 are centered on a hole 16 formed in the center.
The two collar portions 5a to 5c are formed so as to radially project at intervals of 120 degrees. This secures the insulation distance between the windings 6 to 8 wound between the collar portions 5d to 5f.

On the other hand, the coil housing case 12 is formed of a substantially rectangular parallelepiped whose upper end in the drawing is an open end, and the ends 7a, 7b of the winding 7 are positioned on the inner wall surface 12a of the coil housing case 12 and are drawn out in one direction. The wire terminal lead-out portion 10 is formed, and the outer wall surface 1 is formed.
Winding end lead-out portions 11 for positioning the ends of the windings 6 and 8 and leading them out in one direction are formed on 2i and 12i.

3 (a) is a sectional view taken along the arrow AA 'shown in FIG. 2, and FIG. 3 (b) is a half sectional view taken along the arrow BB' in FIG. 3 (a).

First, as shown in detail in FIG. 1A, the winding terminal lead-out portion 10 includes a guide portion 10a for guiding both ends of the winding 7 (not shown), and a support portion 10 for the guided winding terminal.
and b.

The illustrated guide portion 10a is a semicircular recess corresponding to the shape of the winding wire 7 formed on the inner wall surface 12a of the side wall 12g, and the support portion 10b is formed at the intersection of the recess 10a and the bottom surface 12b. It is a formed cylindrical through hole. By inserting the terminals 7a and 7b of the winding wire 7 into the through hole 10b, the winding wire 7 is positioned at a fixed position.

On the other hand, the positioning of each end of the windings 6 and 8 is performed via the winding terminal lead-out portion 11 including the guide portion 18 and the support portion 11b.

The guide portion 18 includes the side walls 12e and 12g and the side walls 12e and 12g.
e, 12g is an outer wall surface 12i, and is a gap 18 formed by the projecting pieces 12c having a substantially triangular shape which are formed so as to project toward the lower end portions on the lower side, and the supporting portion 11b is formed on each projecting piece 12c. It is a groove. The groove 11b is provided so that the inserted terminals can be held when the terminals of the windings 6 and 8 are inserted.

Therefore, by inserting the ends of the windings 6 and 8 led out along the guide portion 18 into the groove 11b,
Each of the terminals is positioned in place.

In this way, each end of each winding is inserted into the support portion while being guided by each guide portion, and is led out from the inside of the coil storage case.

By the way, the other side wall 12 of the illustrated coil storage case 12
At the open ends of f and 12f, separation preventing portions 17 and 17 that prevent the stored annular magnetic core 5 from separating are formed.

In the present embodiment, the separation preventing portions 17 and 17 are protrusions that come into contact with the upper surfaces of the collar portions 5b and 5c when the annular magnetic core 5 is inserted into the coil housing case. Also, the side walls 12e, 12g
Projecting portions 12h, 12h are formed on the inner wall surfaces 12a, 12a so as to project inward, and the lower surfaces of the collar portions 5b, 5c contact the upper surfaces of the projecting portions 12h, 12h. Therefore, the housed annular magnetic core 5 is easily and reliably fixed in the coil housing case 12 by the projections 17, 17 and the projections 12h, 12h.

Next, an assembly process of the toroidal coil device having the above configuration will be described with reference to FIG.

The ferrite core 13 is housed in the core cases 14 and 15 and then connected to form the annular magnetic core 5, and the three windings 6 to 8 are wound to form the toroidal coil 9. The ends 6a, 6b, 7a, 7b, 8 of each winding are
Align a and 8b in one direction.

Then, the toroidal coil 9 and the coil storage case 12 are joined together.

In this case, in this embodiment, both ends 7a and 7b of the winding 7 are supported along the guide portions 10a and 10a by the support portions 10b and 10b.
It is inserted in and supported by the windings 6, but both ends of the windings 6 and 8
a, 8b, 6a, 6b are detoured along the upper surfaces of the collar portions 5b, 5c, and further bent to pass through the gaps 18, 18 as the upper portions of the projecting pieces 12c, 12c, that is, the guide portions, and the supporting portions 11b, 11b. I am trying to get them to support me.

In this way, the ends of each winding are positioned at fixed positions, so that, for example, when the device is mounted on another circuit board, its automation is easy.

Further, the coil storage case 12 and the toroidal coil 9 are securely and easily coupled and fixed by the disengagement prevention portions 17 and 17, and the toroidal coil 9 is prevented from being disengaged from the coil storage case 12 due to vibration or the like. . Further, since no adhesive is required, the material cost can be reduced and the assembly process can be simplified, which can contribute to cost reduction.

Assembling is completed by the simple steps as described above, and the toroidal coil device as shown in FIG. 1 is completed.

It should be noted that the present invention is not limited to the above-described embodiment, but can be variously modified and implemented within the scope of the invention.

For example, in the illustrated embodiment, the coil storage case that stores a part of the annular magnetic core including the two flange portions is shown. However, even when the coil storage case that can store the entire annular magnetic core is used, the same effect as described above is obtained. Obtainable.

[Effect of the Invention] According to the present invention described in detail above, even when three windings are wound, the end of each winding can be derived from the coil storage case, and the toroidal coil can be removed from the coil storage case due to vibration or the like. A toroidal coil device that does not separate can be provided.

[Brief description of drawings]

1 is an external perspective view of a toroidal coil device as an embodiment of the present invention, FIG. 2 is an exploded perspective view of the same device shown in FIG. 1, and FIG. 3 (a) is an arrow AA shown in FIG. 3'is a cross-sectional view, FIG. 3 (b) is a half-sectional view taken along the arrow BB 'shown in FIG. 3 (a), FIG. 4 is an assembly explanatory view of a toroidal coil and a coil storage case, and FIG. FIG. 5A is an explanatory diagram of a conventional toroidal coil device, and FIG. 5B is an explanatory diagram of an annular magnetic core in which three flange portions are formed. 5 ... Annular magnetic core, 5a to 5c ... Collar portion, 5e to 5f ... Between collar portions, 6 to 8 ... Winding, 9 ... Toroidal coil, 6a, 6b, 7a, 7b, 8a, 8b ... Winding end, 10 , 11 ... Winding end lead-out portion, 12 ... Coil storage case, 12a ... Inner wall surface, 12e, 12g ... Side wall.

Claims (4)

[Scope of utility model registration request] 1. A toroidal coil in which a collar portion is provided at a position where the annular magnetic core is divided into three parts, and a winding is wound between the respective collar portions, and an annular magnetic core including the at least two collar portions. A toroidal coil device, comprising: a coil housing case having a winding wire terminal lead-out portion that houses a portion and positions the terminal of each of the windings to lead out in one direction. 2. The toroidal coil device according to claim 1, wherein the winding terminal lead-out portion includes a guide portion for guiding the end portion of each winding and a support portion for each of the guided windings. 3. The toroidal coil device according to claim 1, wherein the coil housing case is provided with a separation preventing portion for preventing separation of the stored toroidal coil. 4. The toroidal coil device according to claim 3, wherein the separation preventing portion is a projection portion that engages with a flange portion of the accommodated annular magnetic core.