JPH06267758A - Core-type reactor with gap - Google Patents

Abstract

PURPOSE:To improve quality by reducing vibration and noise by adjusting the natural frequency of an entire of a core to deviate from a resonance frequency during operation. CONSTITUTION:A winding is mounted on a main core leg formed by laminating a plurality of circular radial core blocks 3 through a gap material therebetween. In a core type reactor with a gap which is formed by containing a reactor body which is assembled by joining the main core leg to a yoke through a gap material inside a container and by filling an interior thereof with insulating medium, at least a gap material 1a of a junction part with a yoke core of gap materials provided between core block 3 and of a junction part with a yoke is formed of a material whose modulus of elasticity is relatively larger than that of a gap material 1b of other parts.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cored reactor with a gap in which the structure of the gap material of the core is improved.

[0002]

2. Description of the Related Art An iron core type reactor with a gap has several gaps in its iron leg due to its characteristics. This gap portion is generated by a magnetic attraction force of a magnetic flux 2 passing through the gap 1 as shown in FIG. , A major source of vibration and noise. Therefore, for the purpose of particularly reducing vibration and noise, a strong gap material having a large elastic coefficient, for example, porcelain is arranged in the gap 1.

In a conventional radial core type reactor, for example, a plurality of columnar gap members 4 are arranged on the circumference of the core block 3 on the core block 3 which is formed by radially arranging core punching plates and adhesively molded. They are arranged at equal intervals, and iron core blocks are stacked on it to form the main landing gear. In this case, an adhesive is applied to both surfaces of the gap member 4 and adhered to the upper and lower iron core blocks 3 to enhance the rigidity of the whole iron core leg.

Looking at the magnetic flux densities of the gaps of the main landing iron core, the magnetic flux density of the gap at the joint with the yoke iron core is generally higher than the magnetic flux density of the gaps at other portions because of the positional relationship with the windings. Are relatively high. Also,
The magnetic attraction force generated in each gap is proportional to the square of the magnetic flux density there, and the vibration and noise are proportional to the imbalance amount of the magnetic attraction force between the gaps.

To cope with such a phenomenon, conventionally, it is considered that a material having a large elastic coefficient as a gap material can reduce vibration and noise, and ceramics having a large elastic coefficient are uniformly used.

[0006]

However, when a material having a large elastic coefficient is used as the gap material as described above, vibration occurs in the gap at the joint with the yoke iron core,
Although it is effective in reducing noise, not only is it not so effective in the gap in the center of the main landing gear, but in some cases, the natural frequency of the entire iron core approaches the resonance frequency during operation.

The present invention has been made in consideration of the above points, and its purpose is to reduce vibration and noise by appropriately adjusting the natural frequency of the entire iron core so as to deviate from the resonance frequency during operation. It is to provide an iron core reactor with a gap and good quality.

[0008]

In order to achieve the above object, the present invention mounts a winding on a main core leg formed by stacking a plurality of circular radial core blocks with a gap material interposed between them. Further, in a cored reactor with a gap in which a reactor main body assembled by joining a main iron core leg to a yoke via a gap material is housed in a container and filled with an insulating medium, the core block and joint Among the gap members provided at the joint with iron, at least the gap member at the joint with the yoke core is made of a material having a relatively large elastic coefficient compared with the gap members at other portions.

[0009]

In the cored reactor with a gap having such a structure, by providing a gap member having a larger elastic coefficient at the joint with the yoke core than other portions, the natural frequency of the entire core can be controlled. Since it is possible to appropriately adjust the frequency to deviate from the resonance frequency, it is possible to suppress the generation of vibration and noise.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a structural example of an iron core reactor with a gap according to the present invention. The same parts as those in FIG. In FIG. 1, a plurality of iron core blocks 3 are stacked with a gap material, for example, a columnar gap material 4 to form a gap portion 1 having a height G, and a main leg 5 is formed. It is mounted and combined with a yoke core consisting of side legs 7 and yoke 8 to form a reactor body, which is housed in a container (not shown) and filled with an insulating medium such as insulating oil or insulating gas to form a core with a gap. Make up a reactor.

When the iron core block 3 is a radial iron core, for example, core punched plates of silicon steel strip are laminated in the radial direction via an adhesive to form a cylindrical block. Further, an adhesive is applied to both sides of a plurality of gap materials, for example, a cylindrical gap material 4 between the core blocks 3 being stacked, and the core materials are fixed to the upper and lower core blocks by adhesion. Then, the gap material is bonded to at least the yoke core 1
a, that is, composed of a material having a relatively large elastic coefficient at two locations, such as a ceramic material.

In the iron core reactor with a gap having such a configuration, the gap material has a relatively large elastic coefficient as compared with at least the joint portion with the yoke iron core, in this example, the upper and lower two portions are larger than the other gap portions. Since the iron core is made of a material, the natural frequency of the entire iron core can be appropriately adjusted so as to deviate from the resonance frequency during operation, and vibration and noise can be reduced and good quality can be achieved.

Needless to say, the present invention is not limited to the embodiments described above and shown in the drawings, and various modifications can be made without departing from the scope of the invention such as the shape and configuration of the iron core.

[0015]

As described above, according to the present invention, since the natural frequency of the entire iron core is properly adjusted so as to deviate from the resonance frequency during operation, vibration and noise are reduced and good quality is achieved. A cored reactor with a gap can be provided.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a cored reactor with a gap according to the present invention.

FIG. 2 is a front view showing a conventional core-reactor with a gap.

[Explanation of symbols]

1 ... Gap, 1a ... Joint gap, 1b ... Gap between core laminations, 2 ... Magnetic flux, 3 ... Iron core block, 4 ... Gap material, 5 ... Main leg, 6 ... Winding, 7 ... Side leg, 8 ... Joint iron.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location H01F 27/33 8123-5E 37/00 8834-5E 8834-5E H01F 27/24 A

Claims (1)

[Claims] 1. A winding is mounted on a main iron core leg formed by stacking a plurality of circular radial iron core blocks with a gap member interposed therebetween, and the main iron core leg is joined to a yoke via the gap member. In a cored reactor with a gap in which the assembled and assembled reactor body is housed in a container and an insulating medium is filled in the container, at least a yoke among the gap members provided between the core blocks and the joint portion with the yoke. A cored reactor with a gap, characterized in that the gearup material at the joint with the iron core is made of a material having a relatively larger elastic coefficient than the gap material at other portions.