JP2002270434A - Core of transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a core of a transformer, which is compact and has im proved productivity. SOLUTION: The core of a transformer comprises I and E cores 1 and 2, and chamfered sections 5 are formed on the end faces of legs 3 of the E core 2. Recesses 6 and 7 for filling an insulator are formed at the inner surface side of the I core 1, and on the bottom surface between the legs of the E core 2, respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transformer core such as an EI type core or an EE type core.

[0002]

2. Description of the Related Art FIG. 4 is a configuration diagram of an EI type transformer core according to a conventional example. The EI type transformer core includes an I type core 1 and an E type core 2. The legs 3 of the E-shaped core 2 are inserted inside and outside the coil 4.

[0003]

In the conventional transformer core shown in FIG. 4, since the end of the leg 3 has a 90-degree edge, the leg 3 of the core 2 is inserted into the coil 4. Then, there is a problem that the coil 4 and the insulator are damaged by the edge of the leg 3 of the core 2. In order to solve this problem, it is necessary to design the coil 4 with a sufficient inner diameter and outer diameter. This applies to cores of other shapes to be inserted into the coil.

An object of the present invention is to solve the above-mentioned drawbacks of the prior art and to provide a small and highly productive transformer core.

[0005]

According to the present invention, in a transformer core (EI type, EE type, or the like), a round or rounded chamfering process is performed on a core leg to insert a core into a coil. In addition, the workability of core insertion is improved, and the coil and the insulator are not damaged by the core edge.

For this purpose, a first means of the present invention is characterized in that a rounded or inclined chamfered portion is formed at an end face corner of the core leg.

According to a second aspect of the present invention, in the first aspect, a concave portion for loading an insulator is formed at an arbitrary portion of the core.

[0008] A third means of the present invention is an I-type core and an E-type core.
A round core or an inclined chamfered portion is formed on an end face of a leg of the E-shaped core.

According to a fourth aspect of the present invention, in the third aspect, a concave portion for loading an insulator is formed on each of the inner surface of the I-shaped core and the bottom surface between the legs of the E-shaped core. It is assumed that.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram of an EI type transformer core according to a first embodiment of the present invention, and FIG. 2 is an enlarged view of the E type core. The EI type transformer core includes an I type core 1 and an E type core 2. Leg 3 of E-shaped core 2
Is inserted into the coil 4.

In the first embodiment, as shown in FIG.
A rounded or inclined chamfered portion 5 is formed at the corner of the end face of the leg 3 of the mold core 2. When the chamfering process is performed in this manner, when the leg 3 is inserted into the coil 4, the corner 4 of the leg 3 does not damage the coil 4. As a result, the workability of core insertion can be improved, and the production efficiency of transformer assembly is improved. The quality of the finished transformer will also be high.

FIG. 3 is a block diagram showing an E according to a second embodiment of the present invention.
It is a block diagram of the core for I type transformers. The EI type transformer core includes an I type core 1 and an E type core 2. E
The leg 3 of the mold core 2 is inserted into the coil 4. In the second embodiment, in addition to having a chamfered portion 5 in the leg portion 3, a concave portion 6 is provided on the inner surface of the I-shaped core 1 at a position facing the bottom surface between the legs 3, 3 of the E-shaped core 2. To form an E-shaped core 2
A recess 7 is also formed on the bottom surface between the legs 3 and 3 so as to face the recess 6.

By inserting or winding an insulator in the recesses 6 and 7, the spatial distance between the cores 1 and 2 and the coil 4 can be reduced. Therefore, coil 4
Can be reduced, for example, by about 10 to 15%.

Although the first and second embodiments have been described using an EI type core, the present invention can be applied to other shape cores such as an EE type core.

[0015]

According to the first and third aspects of the present invention, since the chamfered portion is formed at the end face corner of the core leg, for example, at the end face of the leg of the E-shaped core, the workability of core insertion is improved. And, as a result, the productivity of the transformer assembly can be improved. In addition, since it is not necessary to provide a margin for the dimensions of the coil, the size of the transformer can be reduced.

According to the second and fourth aspects of the present invention, recesses for loading an insulator are formed at arbitrary positions of the core, for example, on the inner surface of the I-shaped core and on the bottom surface between the legs of the E-shaped core. Therefore, in addition to the above-described effects, the spatial distance between the coil and the core can be reduced, and the weight of the electric wire forming the coil can be reduced.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an EI type transformer core according to a first embodiment of the present invention.

FIG. 2 is an enlarged view of the E-shaped core.

FIG. 3 is a configuration diagram of an EI type transformer core according to a second embodiment of the present invention.

FIG. 4 is a configuration diagram of an EI type transformer core according to a conventional example.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 I-shaped core 2 E-shaped core 3 Leg of E-shaped core 2 4 Coil 5 Chamfered part 6, 7 recess

Claims (4)

[Claims] 1. A transformer core wherein a chamfered portion is formed at a corner of an end face of a core leg. 2. The core for a transformer according to claim 1, wherein a concave portion for loading an insulator is formed at an arbitrary portion of the core. 3. A transformer core comprising an I-shaped core and an E-shaped core, wherein a chamfered portion is formed at a corner of an end face of a leg of the E-shaped core. 4. The transformer core according to claim 3, wherein concave portions for loading an insulator are respectively formed on an inner surface side of the I-shaped core and a bottom surface between legs of the E-shaped core. For core.