JPH04357804A - Gapped iron-core reactor - Google Patents

Abstract

PURPOSE:To reduce noise generated by mechanical vibration of a gapped iron- core reactor by uniforming the entire magnetic induction of a gapped iron-core leg and suppressing unbalance of magnetic attracting force between gaps. CONSTITUTION:The material whose magnetic permeability is higher than that of a block iron-core 1b positioned in the central part in terms of height is used for a block ironcore 1a positioned both the top and bottom ends of a gapped iron-core leg 1. Therefore, flux easily converges on the block iron-core 1a at both ends for improved balance of magnetic attracting force of the entire iron-core leg.

Description

[Detailed description of the invention]

[Purpose of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gapped core reactor, and more particularly to an improvement in the core structure for making the magnetic flux density distribution of gapped core legs uniform.

0002

2. Description of the Related Art Conventionally, a gapped iron core type reactor has been generally used as a reactor used as a shunt reactor or the like. This gapped core reactor has an insulating gap member sandwiched between multiple block cores with approximately circular cross-sections, which are formed by laminating radially cut grain-oriented silicon steel sheets with the main magnetic flux and directionality aligned. The block cores are stacked together via a plurality of magnetic gaps to form a gapped core leg, and a yoke core with a rectangular cross section formed by laminating silicon steel plates is placed above and below the core,
It is constructed by winding a winding around the gapped core leg.

0003

However, in the gapped iron core reactor constructed as described above, one major problem is the reduction of noise generated from the reactor body. Noise causes can be broadly classified into those caused by mechanical vibration and those caused by magnetostriction. The mechanical vibration is caused by the magnetic flux passing through the gap that causes a magnetic attraction force to act between the block cores above and below the gap.
This is a phenomenon in which noise is generated due to vibration. Therefore, a configuration is required in which the yoke core and block core are integrally tightened firmly through a gap, but the tightening force decreases due to changes over time and is difficult to manage. On the other hand, magnetostrictive vibrations are vibrations caused by magnetostriction caused by magnetic flux passing through the iron core, and this can be reduced by increasing the core cross-sectional area, keeping the magnetic flux density low, and managing it appropriately. Can be easily reduced. However, the mechanical vibration may be further increased by the magnetic flux distribution of the gapped core legs. In other words, the magnetic flux density is generally lower at both ends of the gapped core leg than at the center in the height direction, which causes an imbalance in the magnetic attraction force in each gap along the height direction of the core leg. This is a phenomenon in which the entire core leg vibrates greatly as a result. This unbalance in magnetic flux distribution is caused by the relative positional relationship between the windings and the core legs. In other words, at the center of the core leg in the height direction, the magnetic flux is firmly held down by the windings into the core, but at the ends of the core leg, the magnetic flux is firmly held down by the windings. This is a phenomenon that occurs when magnetic flux spreads to the ends of the winding.

The present invention eliminates the above-mentioned drawbacks, uniformizes the magnetic flux distribution in the gapped core legs, and reduces mechanical vibration.
The purpose of the present invention is to provide an iron core reactor with a gap that further reduces noise. [Structure of the invention]

[0005]

[Means for Solving the Problems] The gapped core type reactor of the present invention has a material of the block cores located at both ends in the height direction of the gapped core legs in contact with the yoke core, which is made of a material that is lower than that of the block core located at the center. A material with high magnetic permeability is used.

[0006]

[Effect] This makes it easier for magnetic flux to gather at the upper and lower ends of the gapped core legs, making the magnetic flux density uniform throughout the core legs, reducing the imbalance of magnetic attraction between each gap, and machine noise caused by mechanical vibration can be reduced.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings in the case of a single-phase three-leg core reactor with a gap. In FIG. 1, a plurality of block cores 1a each having a substantially circular cross section formed by stacking blanks of silicon steel plates are stacked together with a magnetic gap 2 made of an insulating gap member interposed therebetween to form a gapped core leg 1. A winding wire is wound around this core leg 1 with a gap. Upper and lower yoke cores 4 with a rectangular cross section are constructed by stacking silicon steel plates on the upper and lower sides of the gapped core leg 1.
, 5 are arranged, and the upper and lower yoke cores 4 are connected via the upper and lower clamping plates 6 to the clamping studs 7 and clamping nuts 8.
, 5. The gapped iron core leg 1 is integrally tightened. 9 is the side leg. In the present invention, the punched material of the block core 1a located at the upper and lower ends of the gapped core leg 1 in contact with the upper and lower yoke cores 4 and 5 in the height direction is changed from the material of the punched block core 1a at the center in the height direction. The material of the block iron core 1b at the center in the height direction is a oriented or non-oriented silicon steel plate. As a result, the flow of magnetic flux in the gapped core leg 1 shown by the arrow 10 becomes uniform between the gaps, the imbalance of magnetic attraction force is reduced, and noise due to mechanical vibration can be reduced.

[0008]

As described above, according to the present invention, the material of the block core blanks located at the upper and lower ends in the height direction of the gapped core legs in contact with the yoke core is made of a material with high magnetic permeability. It is possible to obtain a gapped core reactor that suppresses mechanical vibration and further reduces noise by making it easier for magnetic flux to gather than in the block core and making the magnetic flux density uniform in the gapped core legs. .

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of the present invention.

[Explanation of symbols]

1... Core leg with gap
1a...Block core 2...Gap
3...Winding 4, 5...Yoke iron core
6...Tightening plate 7...Stud
8...Tightening nut 9...Side leg
10...Flow of magnetic flux

Claims (1)

[Claims] Claim 1: A gapped core leg is constructed by stacking a plurality of block cores each having a substantially circular cross section formed by stacking punched silicon steel plates radially through a magnetic gap. A winding is wound around the core leg, and a yoke core with a rectangular cross section formed by laminating silicon steel plates is placed above and below the gapped core leg, and the yoke core and gapped core are connected by tightening studs. In a gapped core type reactor in which the legs are integrally tightened, the material of the punched block cores located at the upper and lower ends of the gapped core legs in the height direction is compared with that of the block core located at the center in the height direction. An iron core reactor with a gap characterized by the use of a material with high magnetic permeability.