JPH04357805A - 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:Aluminum shield plates 11a, 11b and 11c are allocated so as not to form a closed loop across a gapped iron-core leg 1 and a coil 3 and to encircle the gapped iron-core leg. Thus, the divergence of flux toward outside space is suppressed at the iron-core leg part for improved balance of the 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, magnetostriction refers to vibrations caused by magnetostriction caused by magnetic flux passing through the iron core, and this can be managed appropriately by increasing the cross-sectional area of the iron core to keep the magnetic flux density low. It can be reduced relatively easily by 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 imbalance 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 suppressed by the windings into the core;
This is a phenomenon that occurs when the magnetic flux spreads to the end of the winding at the end of the core leg.

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]

[0006]

[Means for Solving the Problems] The gapped core reactor of the present invention has an aluminum shield plate disposed between the gapped core leg and the winding so that the magnetic flux passing through the gapped core leg can be directed to the end of the core leg. This is to suppress the spread of the iron core leg to the outer space.

[0007]

[Operation] This makes it possible to equalize the magnetic flux density throughout the core leg, reduce the imbalance of magnetic attraction between the gaps, and reduce noise caused by mechanical vibration.

[0008]

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, aluminum shield plates 11a and 11b are arranged between the gapped core leg 1 and the winding 3, and at the upper and lower ends of the gapped core leg 1, respectively. As a result, it is possible to suppress the spread of the magnetic flux passing through the gapped core leg 1 to the outer space of the core leg at both ends of the core leg, and as shown by the arrow 10, the flow of the magnetic flux of the gapped core leg 1 is controlled between each gap. It becomes uniform at. Therefore, the unbalance of the magnetic attraction force is reduced, and noise caused by mechanical vibration can be reduced.

FIG. 2 shows another embodiment of the present invention.
An aluminum shield plate 11c is arranged between the gapped core leg 1 and the winding 3 without dividing it, so as to cover the entire gapped core leg 1 from the upper end to the lower end. It is clear that the same effect as described above can be obtained in this case as well. Note that the aluminum shield plates 11a, 1
1b and 11c are arranged so as to surround the outer periphery of the gapped core leg 1, but are configured so as not to form an electrically closed loop.

[0011]

As described above, according to the present invention, an aluminum shield plate is disposed between the gapped core leg and the winding, so that the magnetic flux passing through the gapped core leg is prevented from flowing through the gapped core leg at the end of the core leg. It is possible to obtain a gapped core reactor that suppresses spread to the outer space, uniformizes the magnetic flux distribution of the gapped core legs, suppresses mechanical vibration, and further reduces noise.

[Brief explanation of drawings]

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

FIG. 2 is a front view showing another embodiment of the 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. A gapped iron core reactor whose legs are integrally tightened, characterized in that an aluminum shield plate is arranged between the gapped iron core legs and the winding.