JPH0582722B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a gapped iron-core reactor, and more particularly to an improvement in the core tightening structure of a gapped iron-core reactor equipped with a tripod core.

[Technical Background of the Invention and Problems Therewith] Conventionally, an iron core reactor with a gap has been generally used as a reactor used for a shunt reactor or the like. This gapped iron-core reactor consists of a plurality of block iron cores formed by laminating silicon steel strips, which are stacked together via a plurality of magnetic gap to form the iron core legs. A yoke core formed by laminating bands is arranged, and windings are wound around the core legs. A gap member made of an insulating material is generally interposed in the gap portion. In the gapped iron core reactor constructed in this manner, magnetic flux passing through the gap causes a magnetic flux attraction force to act between the block cores above and below the gap, and the resulting vibrations generate noise. For this reason, it is necessary to firmly tighten the yoke core and the core legs together through a gap.

The core tightening structure of a conventional general three-phase three-legged core reactor with a gap is to insert the respective tightening studs through insertion holes formed in each phase core leg and the upper and lower yoke cores. Through this tightening stud, the core leg and yoke core were integrally tightened and fixed from above and below via the tightening plate. However, in this conventional tightening structure, the tightening force from the tightening stud is simultaneously applied to the three phase core legs via the yoke core integrated with the tripod. Therefore, if the contact surfaces of the three core legs and the upper yoke core are all on the same plane, the tightening force of the tightening stud will be applied uniformly to each phase core leg, but in reality, due to assembly errors, each contact It was difficult to arrange the surfaces on the same plane, and there was a risk that the tightening force of each phase core leg would vary, leading to greater vibration and noise.

Generally, in the case of a gapped iron-core reactor, the iron core leg around which the winding is wound is a combination of silicon steel strips and ceramics, and the side legs are composed only of silicon steel strips, and there is a difference in thermal expansion between the two. There is.

Therefore, when heated during operation, if the yoke core is integral, the side legs will stretch more, the yoke core will be curved, and magnetostriction and noise will increase rapidly.

[Object of the Invention] In view of the above points, the present invention provides a method in which the tightening force by the tightening stud is uniformly applied to each phase core leg,
A capped iron core with a three-phase three-legged iron core that not only reduces vibration and noise but also prevents the yoke iron core from bending by absorbing the difference in thermal expansion that occurs between the iron core legs and side legs when heated during operation. The purpose is to provide a shaped reactor.

[Summary of the Invention] The gapped core type reactor of the present invention has a yoke core disposed above and below each phase core leg, and the upper yoke core is located between the core leg and the side leg and at least at one location. By dividing each phase core leg into a wrap joint and making the divided yoke core movable relative to each other, all three contact surfaces between each phase core leg and the upper yoke core are on the same plane. Even in the case where the yoke core legs are different from each other, the error is absorbed by the relative movement of the divided yoke cores, and a uniform tightening force can be obtained for each phase core leg.

[Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

In FIG. 1, a plurality of block cores 6 formed by laminating silicon steel strips are connected to a magnetic gap 6a.
Each of the three phase core legs 3 is stacked through the
a, 3b, 3c, and each phase core leg 3a, 3
Windings 7a, 7b, and 7c are wound around b and 3c, respectively. Above and below these core legs 3a, 3b, 3c, yoke cores 4, 5 formed by laminating silicon steel plates are arranged so as to sandwich these core legs 3a, 3b, 3c, and side legs 15a, 15b of the yoke cores 4, 5 are arranged. magnetically coupled. The inner upper yoke core 5 of this yoke core is divided between core legs 3a and side legs 15a, between core legs 3a and 3b, between 3b and 3c, and between core legs 3c and side legs 15b. , unit yoke cores 5a, 5b, 5c, 5e are formed to correspond to the core legs 3a, 3b, 3c and side legs 15b of each phase. As shown in FIG. 2, the divided parts 14a to 14d of each unit yoke core 5a to 5e are connected by lap joints and are magnetically connected, but they can move relative to each other in the direction of the core legs. . The lower yoke core 4, each phase core leg 3a, 3b, 3c, and unit yoke core 5b,
5c and 5d have straight through holes 8a and 8, respectively.
b, 8c are formed, and tightening studs 11a, 11 made of non-magnetic metal such as stainless steel are respectively installed in these.
1b and 11c are inserted. The lower end of each tightening stud 11a, 11b, 11c is connected to a tightening plate 10a, 10b provided on the outside of the lower yoke core 4.
10c with a nut, and its upper end extends upward from the upper yoke core 5. The upper ends of the tightening studs 11a, 11b, 11c are fastened to fixing plates 12a, 12b, 12c with nuts, and push bolts 13a, 13b, 13c screwed onto the fixing plates 12a, 12b, 12c. By pressing the yoke core 5 through the clamping plates 9a, 9b, 9c, the clamping studs 11a, 11b, 11c are pulled by the reaction force, and the core legs 3a, 3b, 3c and the yoke core 4 and 5 are integrally tightened and fixed.

With such a configuration, each push bolt 13a,
The tightening stud 11 is tightened by the tightening force of 13b and 13c.
a, 11b, 11c, when the core is tightened with an appropriate tightening force, the contact surface between each phase core leg 3a, 3b, 3c and the upper yoke core 5 may be 3 due to errors in manufacturing or assembly. Even if the surfaces are not on the same plane, the upper yoke core 5 is the unit yoke core 5a, 5.
b, 5c, 5d, 5e, each push bolt 13a, 13b, 13 can be moved relatively.
The optimum tightening force of c is applied and the variation in tightening force is eliminated. In addition, unit yoke cores 5a, 5b, 5c,
Due to the relative movement of 5d and 5e, each contact surface is securely and stably in close contact with a sufficiently wide contact surface without inclination, so that the tightening force can be transmitted reliably. moreover,
By wrapping the yoke cores 5a and 5e between the core leg 3a and the side leg 15a and between the core leg 3c and the side leg 15b, the difference in thermal expansion due to heating during operation can be absorbed, and the yoke core can be prevented from curving. It can be prevented.

Note that the division of the upper yoke core 5 is not limited to the 5-division method shown in FIG. 1, but even if it is divided into 4 parts by only one of the division parts 14b and 14c, the effect of uniform tightening force compared to the conventional one can be obtained. can be played.

[Effects of the Invention] As described above, according to the present invention, among the yoke cores disposed above and below each phase core leg of a three-phase tripod core, the upper yoke core is located between the core leg and the side leg. The yoke core is divided into at least one place between each phase core leg to form a wrap joint, and the divided yoke core is relatively movable, so that the tightening force from the tightening stud is applied uniformly to each phase core leg. Equipped with a gear with a three-phase tripod core that can further reduce vibration and noise and prevent the yoke core from bending by absorbing the difference in thermal expansion that occurs between the core legs and side legs when heated during operation. An iron core reactor can be obtained.

[Brief explanation of drawings]

Figure 1 is a front view showing one embodiment of the present invention, Figure 2 is a front view showing one embodiment of the present invention;
The figure is an enlarged view of the main parts. 3a, 3b, 3c... Core leg, 4, 5... Yoke core, 5a, 5b, 5c... Unit yoke core,
6...Block core, 7a, 7b, 7c...Winding, 8a, 8b, 8c...Through hole, 11a, 11
b, 11c...Tightening stud.

Claims (1)

[Claims] 1 A plurality of block iron cores are stacked together via a magnetic gap to form an iron core leg, and a winding wire is wound around each of the iron core legs.
on the core legs and the side legs placed on both sides,
In a gapped core type reactor, a yoke core made of laminated silicon steel plates is placed below, and the core is tightened by tightening studs through insertion holes formed in the yoke core and each phase core leg. An iron core type reactor with a gap, characterized in that an upper yoke iron core is divided and lap jointed between the iron core legs and the side legs and at least one place between each phase iron core leg.