JPS61131407A - Core clamping device for reactor - Google Patents

Abstract

PURPOSE:To prevent the deterioration of electric characteristics due to the positional deviation of a core block by a method wherein the generation of local overheating is prevented and also noise is reduced using a wire rope or by molding insulating resin on the wire rope. CONSTITUTION:The magnetic flux generated on a leg core 1 runs into a center hole too, an eddy current runs on the metal body of a wire rope 4 penetrating the center hole intersecting at right angle with the magnetic flux, and an eddy current loss is generated. However, the current loss is reduced in the metal wire of fine diameter such as the wire rope 4, heating power is also decreased, and local over heating is not generated. Also, the part higher than the height opposing to the height of the leg core 1 is processed into rod form using insulating resin 11, and its diameter is fitted to the diameter of the core center hole, thereby enabling to prevent the position deviation of a core block 2 and to prevent the change in electric characteristics caused by the displacement of the core. Also, the wire rope 4 has the characteristics wherein it is expanded or contracted according to the intensity of load and also it has the function wherein the vibration generated by the core is absorbed, thereby enabling to reduce the noise.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a reactor core tightening device that passes through a center hole of a leg core and a yoke core to connect the leg core and the yoke core.

[Technical background of the invention and its problems]

In a shunt reactor with an iron core, a center hole is provided in the block of the leg iron core, and the leg iron core and the eyelid iron core are tightened using a material that has sufficient strength and has little magnetic influence, such as stainless steel. Non-magnetic metal light □It is fastened and fixed with a nut through an iron core tightening stud bolt made of a rod.

The magnetic flux generated in the reactor core is also generated in the leg core and center hole, and a thin current is generated perpendicular to the magnetic flux in the metal body of the core tightening stud bolt that passes through the center hole, causing local overheating and 1fK adverse effects on the machine. give.

[Object of the invention].

In view of the above points, the present invention is a reactor core tightening device that prevents deterioration of equipment due to localized instant heat, and also prevents changes in electrical characteristics by keeping the leg core block in the normal position. The purpose is to obtain.

[Summary of the Invention] - The present invention provides a core tightening device that penetrates the center hole of the leg core, and a core tightening device that opens in the center of the yoke core stack corresponding to the center hole of the leg core, and connects each phase. In a reactor core tightening device that fixes a leg core and a yoke core, wires made of non-magnetic metal covered with an insulating coating are twisted into a wire rope shape and made of insulating synthetic resin such as epoxy glass resin. The wire is characterized by molding the length corresponding to the leg core and forming rings at both ends of the wire.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. 1st
As shown in the figure, the leg core 1 consists of silicon steel plates arranged radially, core blocks 2 with a hole for the core tightening device in the center, and an appropriate number of core blocks 2 stacked in the axial direction with insulation at appropriate intervals. In configuration 1, a yoke core 3 having a hole opposite to the center hole of the leg core 1 is placed above and below the leg core 1, and as shown in FIG. A magnetic circuit is formed by tightening and fixing with appropriate tightening pressure.

The core tightening device is made of non-magnetic wire rope such as stainless steel, which has little magnetic influence.

As shown in FIG. 4, the strands 10 are constructed in an endless shape in which each strand is insulated with an insulating coating such as epoxy resin. A wire 4 hardened into a rod shape is prepared in advance and passed through the core hole. Lower iron core 3
A spring receiver 7 is placed below, a wire rope receiver 9 is inserted into one end of the wire rope 4, and the wire rope receiver 9 is placed against the lower yoke core 3. At the other end, a plurality of springs 5 are installed between two spring receivers 70 and compressed in advance using stud nuts 8, and then passed through the wire rope 4 and inserted into the through hole of the upper yoke core. The force of the spring 5 is transferred to the wire rope 4 by inserting the wire rope receiver 9 and loosening the stud nut 8. In this way, the yoke core 3 and the leg core 1 are fastened together by the spring 5 via the wire rope 4.

In such a configuration, the magnetic flux generated in the leg core 1 also flows into the center hole, and eddy current flows through the metal body of the wire rope 4 passing through the center hole or perpendicularly to the magnetic flux, producing an eddy current product. Although it acts as the square of the diameter of the body, in a metal wire with a small diameter such as the wire rope 4, the eddy current product is small and the amount of heat generated is small, so local overheating does not occur.

In addition, by processing the part above the height opposite to the height of the leg core 1 into a bar shape with insulating greenery 11 and matching the diameter with the core center hole diameter, it is possible to prevent the position shift of the core block 2 due to the displacement of the core. Changes in electrical characteristics can be prevented. Further, since the wire rope 4 has the property of expanding and contracting depending on the magnitude of the load, it has the effect of absorbing vibrations generated from the iron core, and can reduce noise.

In addition, the shape of the insulating resin 11 wound around the outer periphery of the wire rope 4 can be splined or spiral grooved as shown in FIGS. The cooling effect of the iron core can also be enhanced by forming a .

〔Effect of the invention〕

As explained above, by using a wire rope in the core tightening device, the present invention makes it difficult for the small diameter metal body of the wire rope to generate eddy current product due to the influence of the magnetic flux of the core, which makes it difficult to cause local overheating, and expands and contracts. This absorbs vibrations from the iron core and reduces noise. Furthermore, by molding insulating resin onto the wire rope, it is possible to prevent deterioration of electrical characteristics due to misalignment of the core block, and by devising the shape of the insulating resin 11, the cooling effect can be enhanced.

[Brief explanation of the drawing]

FIG. 1 is a front view showing a core tightening device for a reactor according to the present invention, FIG. 2 is a partially enlarged view of the core tightening device in FIG. 1,
Fig. 83 is a front view showing the wire rope according to the present invention, Fig. 4 is a sectional view taken along the line "A-A" in Fig. 3, and Fig. 5 is a sectional view of a spline type cooling city road structure showing another embodiment. FIG. 6 is a partially enlarged view of a spiral cooling city road structure showing another embodiment. 1... Leg iron core 2... Iron core block 3...
・E-wire core 4...Wire rope 5...Spring 6...Gap 7・Spring holder
8. Stud nut 9 Wire rope receiver 1
0...Elementary wire 11...Insulating resin agent Patent attorney Noriyuki Chika (and 1 other person) Fig. 2 Fig. 3

Claims (1)

[Claims] Each phase leg core and yoke core are fixed by passing a core tightening device that passes through the center hole of the leg core and a core tightening device that opens in the center of the yoke core stack in correspondence with the center hole of the leg core. In this type of reactor core tightening device, a wire made of non-magnetic metal covered with an insulating coating is twisted into a wire rope shape, and a length portion corresponding to the leg core is made of insulating synthetic resin such as epoxy glass resin. A reactor core tightening device characterized by a molded wire with rings formed on both ends of the wire.