JP2000124046A - Transformer wound core - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily manufacture a stepped core and miniaturize a coil and the core by improving the space factor of the core to the coil, and realize reduction in size, loss, and cost of a transformer. SOLUTION: In a transformer wound core 1, constituted of a plurality of unit wound iron cores 11, the unit wound core 11 is constituted as a structure having a plurality of steps where an inner core part 11a and an outer core part 11b are shifted from each other. The inner core part 11a of the unit wound core makes contact with the outer core part 11b of the adjacent unit wound core, and the outer core part 11b of the unit wound core makes contact with the inner core part 11a of the adjacent unit wound core.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transformer core, and more particularly to a transformer core having a plurality of unit cores each having a step.

[0002]

2. Description of the Related Art A transformer is a device for converting high-voltage / small-current AC power into low-voltage / high-current AC power and vice versa. And a constituent coil. In addition, an amorphous magnetic material is used as a material of the iron core other than the silicon steel plate, and a wound core obtained by winding an iron core material other than the laminated iron core as a structure of the iron core has been used.

[0003] A molded transformer for molding an iron core, a coil, and the like with resin is also known. In this molded transformer, cracks are generated due to electromagnetic mechanical force at the time of load-side short-circuit accident. Conventionally, in order to prevent this, a curved portion is provided at the corner of the coil. Then, in order to avoid interference between the curved portion of the coil and the iron core, the coil is expanded in the front-rear or left-right direction while the iron core cross section is rectangular.

Recently, it has been proposed to use an amorphous wound iron core for a three-phase large transformer. Amorphous ribbons are laminated and inserted into a coil as a U-shape, and the ends are joined together to form a unit wound core. A core coil assembly is formed by inserting a plurality of unit wound cores into the coil. As the amorphous wound core, two or more unit wound cores are used in combination in the width direction of the core material due to the limitation of the width dimension of the amorphous ribbon which can be easily obtained. FIGS. 7 and 8 show an iron core coil assembly and a cross section thereof in the amorphous wound iron core transformer. The core coil assembly 3 ′
It consists of a wound core 1 'and a coil 2'. The horizontal size of the entire wound core 1 is the sum of the horizontal sizes of all the unit wound cores 11 ′. Then, since two or more unit cores 11 ′ are combined in the core material width direction to form the wound core 1, the wound core 1 ′ and the coil 2 ′ become large, and since the number of core members increases, the forming and annealing of the wound core are performed. There has been a problem that the man-hour and time are required for the operation, and the space factor in the annealing furnace is also low.

[0005]

SUMMARY OF THE INVENTION The present invention solves the problems of the prior art, in which a stepped iron core can be easily manufactured, the space factor of the iron core with respect to the coil is improved, and the coil and the iron core are formed. It is possible to reduce the size of the transformer, reduce the loss, and reduce the cost.

[0006]

According to the present invention, there is provided a transformer winding core comprising a plurality of unit winding cores, wherein the unit winding core has a stepped structure in which an inner core portion and an outer core portion are displaced from each other. It is a transformer wound iron core.

[0007] The present invention is also a transformer wound core in which the above-mentioned unit wound cores are arranged such that an inner core portion and an outer core portion are shifted from each other.

In the present invention, the inner core of the unit core is in contact with the outer core of the adjacent unit core, and the outer core of the unit core is in contact with the inner core of the adjacent unit core. There is a transformer wound iron core.

Further, the present invention is a transformer wound iron core which is a three-phase five-leg iron core.

[0010] The present invention is also a transformer wound core which is an amorphous wound core.

Further, the present invention is a transformer wound core having two or more unit wound cores in the width direction of the iron core material.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described. Examples of transformer wound iron core of the present invention,
This will be described with reference to FIG. FIG. 1 is an explanatory diagram of a stepped structure in a transformer wound iron core according to a first embodiment. FIG. 2 is an explanatory diagram of an iron core coil assembly using the transformer wound iron core of the first embodiment. FIG. 3 is an explanatory cross-sectional view of an iron core coil assembly using the transformer wound iron core of the first embodiment. FIG. 4 is an explanatory diagram of a method of shifting the unit core used for the transformer core according to the first embodiment. FIG. 5 is an explanatory diagram of an iron core coil assembly using the transformer wound iron core of the third embodiment. FIG. 6 is an explanatory sectional view of an iron core coil assembly using a transformer wound iron core according to the third embodiment.

Embodiment 1 will be described. As shown in FIG. 1, the transformer wound core 1 of the present embodiment has four unit wound cores 11 and is a three-phase five-leg amorphous wound core. The transformer wound iron core 1 and the coil 2 constitute an iron core coil assembly 3 as shown in FIG. Unit winding core 1
Reference numeral 1 denotes a two-step structure having an inner core 11
a and the outer core portion 11b are shifted from each other.
The inner core 11a of the unit core is in contact with the outer core 11b of the adjacent unit core, and the outer core 11b of the unit core is in contact with the inner core 11a of the adjacent unit core. Thereby, as shown in FIG. 3, the size in the left-right direction of the entire transformer core 1 can be reduced by the thickness of the outer core part 11 b, and the unit cores 11 can be moved forward or rearward. , And in the left-right direction. The vertical movement is restricted by the coil 2.

Inner core 11a and outer core 1 of unit wound core
An example of a method of shifting from 1b will be described with reference to FIG. Laminate iron core material consisting of amorphous magnetic ribbon,
Deform into a U-shape and butt the ends. Inner core 11
The part to be a and the outer core part 11b are laminated, and simultaneously formed and annealed. Separators 11c are provided between the inner core 11a and the outer core 11b.
Is inserted to make it easy to shift the portion to be the inner core portion 11a or the outer core portion 11b (see FIG. 4A). And FIG.
As shown in (b), the inner core portion 11a or the outer core portion 11
b is shifted to a predetermined position, and the stepped structure unit wound core 11
To produce

The obtained unit-wound core 11 is opened in a U-shape with the butted ends open, and a predetermined number is collectively inserted into the coil 2 to form an iron core coil assembly 3 in the same manner as in the conventional example. And an amorphous wound iron core transformer.

If a stepped wound core is used to reduce the size and loss of the core and the coil, the number of core members such as the inner core portion and the outer core portion increases, so that the man-hours for forming / annealing and inserting the core increase. However, according to the present embodiment, the inner core 11
a and the outer core 11b are simultaneously formed and annealed, and
When the unit wound core 11 is inserted into the coil 2, the inner core 11
a and the outer core portion 11b are shifted to predetermined positions, then the stepped unit wound core 11 is inserted into the coil 2 so that the core and the coil are reduced in size and loss, and the space factor of the core inside the coil is reduced. Can be improved. or,
Forming and annealing the inner core portion 11a and the outer core portion 11b simultaneously has advantages such as improved work efficiency and improved space factor in the annealing furnace.

The separator 11c inserted between the inner core 11a and the outer core 11b has the same structure as the inner core 1a.
It is used to easily shift the outer core portion 1a or the outer core portion 11b, and can be omitted. Further, the inner core portion 11a does not need to be provided on all unit winding cores 11. Then, instead of inserting the stepped unit core 11 into the coil 2, the coil 2 may be wound around the unit core 11 to form the core coil assembly 3.

Embodiment 2 will be described. In the transformer core of the present embodiment, the unit core 11 is formed and annealed separately from the inner core 11a and the outer core 11b deformed into a U-shape. Then, when inserting the unit wound iron core 11 into the coil 2,
The inner core portion 11a and the outer core portion 11b of each step are inserted into predetermined positions, respectively, to form a unit wound core having a stepped structure. By inserting all unit wound cores 11, the same core coil assembly 3 as in the first embodiment can be obtained. By the inner core 11a and the coil 2 inserted earlier,
The insertion position of the outer core 11b to be inserted next can be determined.

Embodiment 3 will be described. As shown in FIG. 5, the transformer core of the present embodiment includes eight unit cores 11. The unit winding core 11 has a two-step structure, and is combined in the width direction of the core material. As shown in FIG. 6, a part of the inner core part 11a of the unit core is inserted into the outer core part 11b of the unit core in contact with the width direction of the core material. It is possible to prevent.

As described above, the number of steps in the unit core in each embodiment has been described in two steps, but it is possible to have three or more steps. Also, a core using silicon steel plate or the like as the core material can have a stepped wound core structure in the same manner.

[0021]

According to the present invention, the stepped iron core can be easily manufactured, and the space factor of the iron core with respect to the coil is improved, so that the coil and the iron core can be downsized. Pricing is achieved.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a stepped structure in a transformer wound iron core according to a first embodiment.

FIG. 2 is an explanatory diagram of an iron core coil assembly using the transformer wound iron core of the first embodiment.

FIG. 3 is an explanatory sectional view of an iron core coil assembly using a transformer wound iron core according to the first embodiment;

FIG. 4 is an explanatory diagram of a method of shifting a unit wound core used for a transformer wound core according to the first embodiment.

FIG. 5 is an explanatory diagram of an iron core coil assembly using a transformer wound iron core according to a third embodiment.

FIG. 6 is an explanatory sectional view of an iron core coil assembly using a transformer wound iron core according to a third embodiment;

FIG. 7 is an explanatory view of an iron core coil assembly using a conventional transformer wound iron core.

FIG. 8 is an explanatory sectional view of an iron core coil assembly using a conventional transformer wound iron core.

[Description of Signs] 1 Transformer wound core 11 Unit wound core 11a Inner core 11b Outer core 11c Separator 2 Coil 3 Iron core coil assembly

Claims (6)

[Claims] 1. A transformer core comprising a plurality of unit cores, wherein the unit core has a stepped structure in which an inner core part and an outer core part are displaced from each other. Transformer wound iron core. 2. The transformer core according to claim 1, wherein the unit core is arranged such that an inner core part and an outer core part are shifted from each other. 3. The transformer core according to claim 1, wherein an inner core of the unit core is in contact with an outer core of an adjacent unit core, and an outer core of the unit core is adjacent to the unit core. A transformer wound core, which is in contact with the inner core of the unit wound core. 4. The transformer core according to claim 1, wherein the core is a three-phase five-leg core. 5. The transformer wound iron core according to claim 1, wherein the transformer wound iron core is an amorphous wound iron core. 6. The transformer wound core according to claim 5, comprising two or more unit wound cores in a width direction of the core material.