JP3357706B2 - Iron core type reactor with gap - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gapped iron core type reactor having a gapped iron core leg, and more particularly, to a magnetic gap material used for the gapped iron core leg by improving the material thereof. The present invention relates to a core-reactor with a gap that reduces noise.

[0002]

2. Description of the Related Art As a reactor used for a shunt reactor or the like, a cored reactor with a gap is generally used. This gapped iron core reactor includes a gapped iron core leg having a circular cross section, and is configured as shown in FIGS. 3 and 4. First, as shown in FIG.
The iron core leg 1 with a gap has a plurality of block iron cores 2 having a circular cross section, and a plurality of magnetic gaps formed by sandwiching a magnetic gap material 3 made of an insulator therebetween. It is constructed by stacking. In this case, as shown in FIG. 4, the block core 2 is formed by laminating annularly shaped punched plates of silicon steel plates 2 a in a radial pattern. In order to form each magnetic gap between the block cores 2, a plurality of gap members 3 are used for one magnetic gap. As shown in FIG. 3, a winding 4 is wound around the iron core leg 1 with a gap. Further, yoke iron cores 5 and 6 having a rectangular cross section are tightly arranged and integrally fixed above and below the iron core leg 1 with a gap so that the iron core legs 1 and 6 are sandwiched therebetween. Are laminated.

[0003] In the iron core reactor with the gap configured as described above, reduction of noise generated from the reactor body is an important issue. Such noise can be roughly classified into noise due to mechanical vibration and noise due to magnetostriction according to the factors. Among them, the noise due to the mechanical vibration is the vibration noise generated by the vibration caused by the magnetic attraction force between the block cores 2 above and below the magnetic gap due to the magnetic flux passing through the magnetic gap. is there. In order to prevent such vibration noise, the block core 2 of the iron core with gap 1 is tightened via a magnetic gap, and the iron core with gap 1 and the yoke cores above and below the iron core are firmly integrated. A tightening structure for tightening is required.
The noise due to the magnetostriction is a magnetostriction noise generated due to a magnetic flux flowing inside the iron core and a magnetostriction noise further enhanced as a result of an unreasonable compressive force acting inside the iron core by the above-described tightening structure. Among such magnetostrictive noises, in the iron core reactor with the gap, the effect of the magnetostrictive noise caused by the compressive force is particularly large.

[0004]

The above-described vibration noise and magnetostrictive noise generated in the conventional iron core reactor with a gap as shown in FIGS. 3 and 4 are uniformly applied to all the magnetic gap portions. Since a gap material such as ceramics having a high Young's modulus is used, the material of the gap material tends to be further enhanced.

First, vibration noise is promoted as follows. That is, in the above-described iron core reactor with a gap, as shown in FIG. 4, a plurality of gap members 3 are used for one magnetic gap.
Are manufactured one by one, and a small error occurs in the dimensions during the manufacturing process. When a plurality of gap members 3 having a minute dimensional error are arranged between the block cores 2, the gap members 3 have a high Young's modulus and are hard, so that some gap members among many gap members 3 are formed. In some cases, the material 3 cannot be adapted to the block core 2 and acts to further promote vibration noise.

[0006] Magnetostrictive noise is promoted as follows. That is, in the cored reactor with a gap as described above, the magnetic flux causes fringing in the magnetic gap portion, so that the magnetic flux concentrates on the inner and outer peripheral portions of the block core 2, and as shown in FIG. The temperature rise value of the inner and outer peripheral portions becomes considerably high locally. In this case, FIG.
4 is a graph showing a relationship between a radial position R of the block core 2 in FIG. 3 and a temperature rise value θ. For this reason, as shown by the broken lines in FIG. 5, the inner and outer peripheral portions of the block core 2 tend to expand in the vertical direction by δh due to thermal expansion. However, since the upper and lower sides of the block core 2 are both firmly fixed by the gap material 3 having a high Young's modulus, the elongation δh cannot be absorbed. As a result, excessive compressive stress is generated in the inner and outer peripheral portions of the block core 2, and the magnetostriction is further increased accordingly, and the magnetostrictive noise caused by the above-described compressive force is further promoted.

[0007] The present invention has been proposed to solve the above-mentioned problems of the prior art, and has the following objects.
Improving the material of the gap material that forms the magnetic gap between the block cores, reducing vibration noise by adapting the gap material to the block core, and magnetostrictive noise caused by excessive compression force generated in the block core To reduce
An object of the present invention is to provide a cored reactor with a gap capable of reducing noise.

[0008]

In order to achieve the above-mentioned object, a gapped iron core reactor according to the present invention comprises a plurality of silicon steel plates which are radially arranged in a ring shape to form a plurality of circular sections. A block core is formed, the block cores are stacked via a magnetic gap material to form a gapped core leg, and a winding is wound around the gapped core leg. And a cored reactor with a gap formed by integrally fixing a yoke core having a rectangular cross section with the following features. That is, the cored reactor with a gap according to claim 1 is:
The gap material disposed at the center in the stacking direction has a lower Young's modulus than the gap material disposed at both ends in the stacking direction of the block core among the gap materials. The gap core reactor according to claim 2, wherein the Young's modulus of the gap member disposed at the inner and outer peripheral portions of the block core is set in the other portion of the block core. Is characterized by being lower than the Young's modulus.

[0009]

The operation of the cored reactor with a gap according to the present invention having the above-described structure is as follows. First, in the structure of the first aspect, among the gap members, the Young's modulus of the gap member at the center in the stacking direction is reduced, so that the flexibility of the gap member at this portion is increased. Therefore, even when the gap material in this portion has the small dimensional error as described above, the adaptability of the gap material in this portion to the block core can be improved, and vibration noise can be suppressed. . In addition, the gap material at both ends in the stacking direction has a high Young's modulus, and the vibration due to the magnetic attraction force particularly acting on the gap material at this portion can be reduced as much as possible, so that the vibration noise can be suppressed.
This will be described below.

That is, generally, in a cored reactor with a gap, since the magnetic flux densities of the respective magnetic gaps are equal, the magnetic attraction F acting on the block cores 2 is, as shown in FIG. While a large magnetic attraction force F acts on the gap members 3a at both ends (upper and lower ends) in the stacking direction of the iron core leg 1 with a gap, the block iron core 2 at the center of the iron core leg 1 with a gap.
The magnetic attraction force F hardly acts on the gap material 3b sandwiched therebetween. Therefore, by increasing the Young's modulus of the gap members 3a at both ends in the stacking direction, vibrations due to magnetic attraction that largely act on the gap members 3a at this portion can be reduced as much as possible.

According to the second aspect of the present invention, since the Young's modulus of the gap material disposed at the inner and outer peripheral portions of the block iron core among the gap materials is low, the flexibility of the gap material in this portion is high. Has become. Therefore, when the above-described thermal expansion occurs in the inner and outer peripheral portions of the block core, the elongation can be absorbed by the flexibility of the gap material, and this is caused by an excessive compression force generated in the block core. An increase in magnetostrictive noise can be suppressed.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Two embodiments in which the present invention is applied to a single-phase three-legged cored reactor with a gap will be specifically described below with reference to FIGS. Here, FIG. 1 is a front view showing a first embodiment of a cored reactor with a gap according to the present invention, and FIG. 2 is a diagram showing a second embodiment of a cored reactor with a gap according to the present invention. It is explanatory drawing which shows arrangement | positioning of the gap material with respect to FIG.

(1) First Embodiment FIG. 1 As shown in FIG. 1, the iron core leg 1 with a gap according to the first embodiment.
Is a block core 2 having a plurality of circular cross-sections, which are formed by stacking silicon steel blanks radially in an annular shape and laminated.
Are coaxially stacked such that a plurality of magnetic gaps are formed by sandwiching a magnetic gap material 3 made of an insulator therebetween. A winding 4 is wound around the iron core leg 1 with a gap.
Upper and lower yoke cores 5 and 6 having a rectangular cross section are arranged above and below the gap-equipped iron core leg 1 so as to sandwich it. The yoke cores 5 and 6 include upper and lower fastening plates 7.
And by the fastening studs 8, they are integrally fixed to the iron core leg 1 with the gap. In the present embodiment, the Young's modulus of the gap members 3a at both the upper and lower ends of the core member 1 with the gap among the gap members 3 is set relatively high as in the conventional example described above. The Young's modulus of the gap material 3b at the center of the leg 1 is slightly lower than the Young's modulus of the gap material 3a at both the upper and lower ends of the core leg 1 with a gap.

The operation of this embodiment having the above configuration is as follows. That is, since the Young's modulus of the gap material 3b at the center of the iron core leg 1 with a gap is slightly lower than that of the related art, the flexibility of the gap material 3b at this portion is higher than that of the related art. Therefore, the adaptability of the gap member 3b to the block iron core 2 in this portion can be improved as compared with the related art, so that the vibration noise can be suppressed accordingly. The gap members 3a at the upper and lower ends of the iron core leg 1 with a large magnetic attraction force have a high Young's modulus and can minimize vibration caused by the magnetic attraction force, thereby suppressing vibration noise. be able to.

(2) Second Embodiment FIG. 2 As shown in FIG. 2, in the second embodiment, of the plurality of gap members 3 arranged between the adjacent block cores 2, The Young's modulus of the gap material 3c disposed on the inner and outer peripheral portions is slightly lower than the Young's modulus of the gap material 3d disposed on other portions of the block core 2. The other parts are configured exactly the same as in the first embodiment.

In this embodiment having the above configuration, the Young's modulus of the gap material 3c disposed on the inner and outer peripheral portions of the block iron core 2 is lower than that of the prior art.
The flexibility of the gap material 3c in this portion is higher than in the conventional case. Therefore, when the temperature rise value of the inner and outer peripheral portions of the block core 2 locally increases and thermal expansion occurs in the inner and outer peripheral portions of the block core 2, the elongation of the block core 2 is determined by the flexibility of the gap material 3c. Therefore, an increase in magnetostrictive noise caused by an excessive compression force generated in the block core 2 can be suppressed.

(3) Other Embodiments The present invention is not limited to the above embodiments, but can be applied to other than the above-described single-phase three-legged cored reactor with a gap. For example, the present invention can be similarly applied to a three-phase three-leg iron core type or a three-phase five-leg iron core reactor with a gap. Further, it is also possible to adopt a configuration in which the two embodiments are combined. That is, in the stacking direction of the block core, the gap material at the center of the block core is configured to have a low Young's modulus, and in each magnetic gap, the Young's modulus of the gap material at the inner and outer peripheral portions of the block core is reduced. It is also possible to configure, and in this case, an operational effect combining the operational effects of the two embodiments can be obtained. Further, the material and dimensions of the gap material, or specific values of the Young's modulus, and the like can be appropriately selected according to the design of the iron core with a gap. Further, since the present invention is particularly characterized by the material of the gap material of the iron core leg with a gap, the specific configuration of the other parts can be appropriately selected.

[0018]

As described above, according to the present invention, among the gap members, the Young's modulus of the gap member disposed at the center of the block core in the stacking direction or the gap member disposed at the inner and outer peripheral portions of the block core is determined. By improving the simple structure of lowering the gap material compared to other parts, the vibration noise can be reduced by adapting the gap material to the block core, or the compression force generated in the block core can be reduced. Since the resulting magnetostrictive noise can be reduced, it is possible to provide a cored reactor with a gap that can reduce noise.

[Brief description of the drawings]

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

FIG. 2 is a view showing a second embodiment of a cored reactor with a gap according to the present invention, and particularly, an explanatory view showing an arrangement of a gap material with respect to a block core.

FIG. 3 is a front view showing an example of a conventional iron core reactor with a gap.

FIG. 4 is a plan view showing a block core and a gap member of FIG. 3;

5 is a graph showing the relationship between the radial position R of the block core in FIG. 4 and its temperature rise value θ.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Iron core leg with gap 2a ... Silicon steel plate 2 ... Block iron core 3, 3a-3d ... Gap material 4 ... Winding 5, 6 ... Yoke iron core 7 ... Clamping plate 8 ... Tightening stud

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-112111 (JP, A) JP-A-56-15017 (JP, A) JP-A-62-6510 (JP, A) 187124 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01F 27/24 H01F 27/33 H01F 37/00

Claims (2)

(57) [Claims] 1. A plurality of block cores having a circular cross section are formed by annularly laminating silicon steel plates in a radially arranged form, and the block cores are stacked via a magnetic gap material to form a core with a gap. In a core-type reactor with a gap, a leg is formed, a winding is wound around the core with a gap, and the core with a circular cross-section and the yoke core with a rectangular cross-section are integrally fixed. A gap-shaped iron core characterized in that the Young's modulus of the gap material disposed at the center in the lamination direction is lower than the Young's modulus of the gap material disposed at both ends in the lamination direction of the block core among the gap materials. Reactor. 2. A plurality of block cores having a circular cross section are formed by stacking silicon steel plates radially in a radial arrangement, and the block cores are stacked via a magnetic gap material to form a core with a gap. In a core-type reactor with a gap, a leg is formed, a winding is wound around the core with a gap, and the core with a circular cross-section and the yoke core with a rectangular cross-section are integrally fixed. The gap material, wherein the Young's modulus of the gap material disposed on the inner and outer peripheral portions of the block core is lower than the Young's modulus of the gap material disposed on other portions of the block core. Iron core type reactor.