JPH11162748A - Electromagnetic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic device, by which a wire can be wound around a small-sized annular core without using partition plates, and insulation among multiple windings can be ensured. SOLUTION: An electromagnetic device is provided with an almost annular core 1, multiple windings 2 and 3 which are wound around the almost annular core 1 with a space between them and terminals 4a, 4b, 5a and 5b provided near the ends of the windings 2 and 3. The starting and finishing ends 2a, 2b, 3a and 3b of the windings 2 and 3 are respectively crossed and are connected to the terminals 4a, 4b, 5a and 5b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic device which is used for a current transformer or a noise filter of an electric device and has a ring-shaped core provided with a coil.

[0002]

2. Description of the Related Art As shown in FIGS. 7 and 8, a plurality of coils 51 and 52 are wound in a toroidal shape around a ring-shaped core 50 to form a transformer used for electric equipment and the like. As the windings 51 and 52 to be used, an enamel wire having an insulating coating is adopted, but the insulation performance between the windings 51 and 52 is deteriorated due to scratches on the insulating coating or pinholes.

In order to secure electrical insulation between the plurality of windings 51 and 52, a primary winding 51 and a secondary winding 52 are provided.
Generally, a partition plate 53 made of an insulating resin or the like is used between them. By using the partition plate 53, an insulation distance (creeping distance) between the primary winding 51 and the secondary winding 52 can be secured. Numeral 54 denotes a ring-shaped bobbin provided with a terminal 55, in which a partition plate 53 is provided and a ring-shaped core 50 is incorporated.

[0004]

SUMMARY OF THE INVENTION A conventional partition plate 5
In the case of the ring-shaped bobbin 54 having a core 3 having the partition 3, the number of components increases due to the presence of the partition 53, and the number of steps for installing the partition 53 increases, and the winding space is reduced by the presence of the partition 53. As a result, winding workability of the windings deteriorates, and it becomes difficult to adopt small ring-shaped bobbins and ring-shaped cores. Also had the problem of inequality.

Accordingly, it is an object of the present invention to provide an electromagnetic device which can be wound around a small ring-shaped core without using a partition plate, and which can ensure insulation between a plurality of windings.

[0006]

According to an aspect of the present invention, there is provided an electromagnetic device, comprising: a substantially ring-shaped core; a plurality of windings wound around the substantially ring-shaped core separately from each other; And a terminal provided closer to the terminal and connected to the terminal so that terminals at the beginning and end of winding of the winding cross each other.

According to the first aspect of the present invention, the windings are contracted in the axial direction by the tensions of the winding start terminal and the winding end terminal which intersect each other, so that a plurality of windings can be formed without using a partition plate. The insulation distance can be easily secured, and a partition plate is not required, so that the number of parts and the number of manufacturing steps can be reduced. The effect is particularly large in the case where the inner diameter of the substantially ring-shaped core is small.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIGS. That is, the transformer as the electromagnetic device has a substantially ring-shaped core 1, a plurality of windings 2, 3, and terminals 4a, 4b, 5a, 5b. The substantially ring-shaped core 1 is a toroidal core using a circular ring-shaped ferrite, and its surface is coated with an insulating film.

A plurality of windings 2 and 3 are wound around a substantially ring-shaped core 1 separately from each other. The winding 2 is, for example, a primary winding, and the winding 3 is a secondary winding. Terminals 4a, 4
b, 5a and 5b are arranged near the ends of the windings 2 and 3, that is, near the ends of the windings 2 and 3. In the embodiment, the leg of the bobbin 7 is also suspended from the lower surface of the corner of the rectangular bobbin 7 on which the substantially ring-shaped core 1 on which the windings 2 and 3 are wound is placed. A projection 6 is provided on the upper surface of the corner of the bobbin 7,
The substantially ring-shaped core 1 is prevented from falling off.

The terminals 2a, 2b, 3a, 3b at the beginning and end of winding of the windings 2, 3 are crossed and connected to terminals 4a, 4b, 5a, 5b. That is, the winding start terminal 2a and the winding end terminal 2b of the winding 2 are wound around the substantially ring-shaped core 1 and then crossed to form a winding start terminal 2a.
Is connected to the terminal 4b on the winding end side of the winding 2, and the winding end terminal 2b is connected to the terminal 4a on the winding start side. Similarly, the winding start terminal 3a and the winding end terminal 3b of the winding 3 are crossed after being wound on the substantially ring-shaped core 1, and the winding start terminal 3a is wound on the terminal 5b on the winding end side of the winding 2 again. The end terminal 3b is connected to the terminal 5a on the winding start side. With this connection, the terminal 2a (3
Due to the mutual tension of the terminal a and the end 2b (3b) at the end of the winding, the windings 2 (3) wound around the substantially ring-shaped core 1 each receive a contracting force in the axial direction to form a densely contracted coil. To prevent axial elongation, resulting in a plurality of windings 2,
3, particularly an insulation interval on the inner diameter side of the substantially ring-shaped core 1 can be secured.

According to the first embodiment, winding start terminals 2a, 3a and winding end terminals 2b, which cross each other,
Since the windings 2 and 3 are contracted in the axial direction by the tension of 3b, the insulation distance between the plurality of windings 2 and 3 can be easily secured without using a partition plate. Points and manufacturing steps can be reduced. The effect is particularly large in the case where the inner diameter of the substantially ring-shaped core 1 is small.

Also, the windings 2 and 3 around the substantially ring-shaped core 1 coated with the insulating resin are suitable for the downsizing of the substantially ring-shaped core 1, so that the effect is large. A second embodiment of the present invention will be described with reference to FIGS. That is, in the first embodiment, in order to fix and hold a portion where the winding start terminals 2a, 3a and the winding end terminals 2b, 3b cross in the first embodiment, the bobbin 7 has a winding terminal guiding and holding device. X-shaped cross groove 8 is provided.

By providing the cross grooves 8 on the bobbin 7, the winding ends 2a, 2b, 3a, 3b can be easily positioned and fixed. Others are the same as in the first embodiment. A third embodiment of the present invention will be described with reference to FIGS. That is, this transformer differs from the first embodiment in that three windings 2, 3, and 9 are provided, and six terminals 4a, 4b, 5a, 5b,
10a and 10b are disposed at positions near the ends of the windings 2, 3, and 9, that is, at positions near the ends. The terminals 2a, 2b, 3a, 3b, 9a, 0b of the windings 2, 3, 9
Are crossed and the terminals 4a, 4a, 4
b, 5a, 5b, 10a, and 10b. Others are the same as in the first embodiment.

[0014]

According to the first aspect of the present invention, since the winding is contracted in the axial direction by the tension at the winding start terminal and the winding end terminal crossing each other, a plurality of windings can be formed without using a partition plate. The insulation distance between them can be easily ensured, and a partition plate is not required, so that the number of parts and the number of manufacturing steps can be reduced. The effect is particularly large in the case where the inner diameter of the substantially ring-shaped core is small.

[Brief description of the drawings]

FIG. 1 is a side view of a first embodiment of the present invention.

FIG. 2 is a plan view thereof.

FIG. 3 is a side view of a bobbin according to a second embodiment.

FIG. 4 is a side view of the transformer.

FIG. 5 is a plan view of a third embodiment.

FIG. 6 is a side view thereof.

FIG. 7 is a plan view of a conventional example.

FIG. 8 is a side view thereof.

[Explanation of symbols]

 Reference Signs List 1 substantially ring-shaped core 2 winding 2a, 2b terminal 3 winding 3a, 3b terminal 4a, 4b terminal 5a, 5b terminal 7 bobbin 9 winding 9a, 9b terminal 10a, 10b terminal

Claims (1)

[Claims] 1. A winding comprising: a substantially ring-shaped core; a plurality of windings wound around the substantially ring-shaped core separately from each other; and a terminal provided near an end of the winding. An electromagnetic device characterized in that the terminals at the beginning and end of the winding are crossed and connected to the terminal.