JP2504968Y2 - Resin mold transformer - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spacer for positioning an iron core and a coil in a resin mold transformer.

[0002]

2. Description of the Related Art FIGS. 7 and 8 are a front view including a partial cross section and a side view including a partial cross section of a conventional resin mold transformer disclosed in, for example, Japanese Utility Model Publication No. 61-25227, and FIG. It is a perspective view of the spacer used for the resin mold transformer. In the figure, 1 is a casing, 2 is a coil,
Reference numeral 4 is a cast insulator such as an epoxy resin. 6 is an iron core, 5
Is a substantially conical spacer made of an insulating material, and the coil 2
Also, the insulation thickness is secured by setting the spatial positions of the casing 1, the coil 2 and the iron core 6 which are bonded to the iron core 6 and casting the casting insulator 4.

In the resin mold transformer as described above, the casing 1 is often used as a molding die 7 (not shown) in which the outer shape of the mold transformer is shaded so that the casting insulator 4 is exposed as it is. . Hereinafter, a resin mold transformer for casting the casting insulator 4 using the molding die 7 will be described.

The production of such a resin mold transformer is
First, the wound coil 2 is combined with the iron core 6. Then, the spacer 5 is adhered to the coil 2 and the iron core 6 at a predetermined position with an adhesive, and the spacer 5 is incorporated into the molding die 7. At this time, the coil 2 and the iron core 6 are supported by the spacer 5 and the molding die 7
It is floating inside. Next, the coil 2, the iron core 6 and the molding die 7 are preheated and the casting insulator 4 is injected into the molding die 7. After the casting insulator 4 is hardened, the molding die 7 is cured.
A resin mold transformer is manufactured by taking it out from.
Here, the coil 2 is wound in several layers to obtain the required number of turns, and the wire diameter and the number of turns are changed according to the rating, so that the outer dimensions of the coil 2 vary greatly. Spacer 5
Since the bonding area is small, the bonding strength is weak and the spacer 5 is likely to fall off due to an external force.

[0005]

As described above, in the conventional resin mold transformer, since the spacer 5 is bonded to the coil 2 having a non-uniform outer dimension, it is bonded to the coil 2 on the inner surface of the molding die 7. In order to bring the spacers 5 into uniform contact, the workability is poor, such as shaving the tips of the spacers 5 or replacing them with spacers 5 of different dimensions. Further, since the adhesive force of the spacer 5 is weak , the mold die 7 is moved when the coil 2, the iron core 6 and the mold die 7 are preheated .
The vibration during this movement causes the spacer 5 to fall off, causing the coil 2 and the iron core 6 to become eccentric.

The present invention has been made to solve the above problems, and uses a spacer which stabilizes the coil 2 and the iron core 6 in the molding die 7 and has a good adhesiveness to the coil 2 or the iron core 6. The purpose is to provide the former resin mold transformer.

[0007]

The resin mold transformer according to the present invention comprises a coil 2 in a casting insulator 4 and an iron core 6.
Flat base that is wider than the conical bottom area provided in the lower part of the cone integrally with the substantially conical spacer 3 used for setting the position of the
3a, the bottom of the base 3a is fixed to the iron core 6 and the spacer 3
Is attached.

[0008]

[Action] Resin molded transformer according to this invention, the wide base 3a of the bottom area is secured to firmly core 6 the spacer 3.

[0009]

EXAMPLES Example 1. 1 is a front view including a partial cross section of a resin mold transformer showing an embodiment of the present invention, FIG. 2 is a perspective view of a spacer used in the resin mold transformer of the present invention, and FIGS. It is a figure which shows the Example of. In the figure,
2, 4, 6 and 7 are the same as those described in the above conventional device. 3 is a spacer made of a substantially conical insulator, and has a flat base 3a at the bottom of the cone that is wider than the conical bottom area, and the bottom of the base 3a is flat. Is provided with a convex portion 3b. A plane exists between the convex portion 3b and the lower part of the cone. The spacer 3 having such a large bottom area
Since the placement is stable, the conical portion can be formed long. Therefore, as shown in FIG. 1, the spacer 3 having a long conical portion is used.
It is possible to secure an insulation distance between the coil 2 and the inner surface of the molding die 7 by directly fixing the to the iron core 6. Since the spacer 3 is fixed to the iron core 6 whose dimensions are stable, the coil 2
Since the position of the iron core 6 in the molding die 7 is stable, workability is improved.

The spacers 3 are fixed to the iron core 6 by binding the flat plate portion of the base 3a to the iron core 6 with an insulative thread string 8 as shown in FIG. 3, or as shown in FIG. It is possible to use means such as winding the flat plate portion around the iron core 6 with the insulating tape 9, or adhering the bottom surface of the base 3a to the iron core 6 with the adhesive 10 as shown in FIG. is there. Tying in Itohimo 8, the convex portions 3b is a solid spacer 3 in means of winding a tape 9
Make sure that the string 8 or tape 9 is wrapped around when wearing
As a result, the movement of the thread string 8 or the tape 9 is prevented.
Further, in the means for winding in tie or tape 9 Itohimo 8 can be more firmly fixed when combined the adhesive 10.

The iron core wrapped with the casting insulator 4 such as epoxy resin is generally wrapped with a magnetostrictive cushioning material in order to prevent the magnetic characteristics from changing due to shrinkage of the casting resin during curing. In the means for winding with the tape 9, the magnetostrictive buffering material can be used as the tape 9 and can be realized at the same time as the fixing of the spacer 3.

[0012]

As described above, in the present invention, since the spacer 3 is integrally provided with the base 3a at the lower part of the cone, a long spacer can be stably placed, so that the spacer 3 is fixed to the iron core 6. Make an insulation distance casting insulator 4 by
Can coercive be Rukoto, coils 2 and the iron core 6 is stable in the sticking property is good mold 7 to core 6 can be obtained good workability resin molded transformer.

[Brief description of drawings]

FIG. 1 is a front view including a partial cross section of a resin mold transformer showing an embodiment of the present invention.

FIG. 2 is a perspective view of a spacer used in the resin mold transformer of the present invention.

FIG. 3 is a view showing an embodiment of fixing the spacer of the present invention.

FIG. 4 is a view showing an embodiment of fixing a spacer according to the present invention.

FIG. 5 is a view showing an embodiment of fixing the spacer of the present invention.

FIG. 6 is a perspective view of a spacer used in a conventional resin mold transformer.

FIG. 7 is a front view including a partial cross section of a conventional resin mold transformer.

FIG. 8 is a side view including a partial cross section of a conventional resin mold transformer.

[Explanation of symbols]

 2 Coil 3 Spacer 3a Base 4 Cast insulator 5 Spacer 6 Iron core 7 Mold

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References Japanese Patent Laid-Open No. 59-75612 (JP, A) Actual No. 59-107125 (JP, U)

Claims (1)

(57) [Scope of utility model registration request] 1. A resin-molded transformer in which a coil 2 and an iron core 6 are enclosed by a casting insulator 4, and a substantially conical shape used for setting the position of the coil 2 and the iron core 6 in the casting insulator 4. A spacer 3 made of an insulating material, a flat plate-shaped base 3a which is integrally provided with the spacer 3 in the lower part of the cone and has a larger conical bottom area, and the bottom of the base 3a is fixed to the iron core 6 to fix the spacer 3 to the iron core. A resin mold transformer characterized in that it is attached to 6.