SU1103296A2 - Three-phase magnetic circuit for electric induction devices - Google Patents

Abstract

THREE PHASE MAGNETIC WIRE FOR ELECTRIC INDUCTION DEVICES according to author. St. No. 970493, characterized in that, from the reduction of losses and current of the idle path, additional packages of triangular shapes were added to the C-shaped parts of the magiito wire, which were dug to the side surfaces of adjacent parts. (L with: with 1C with O5

Description

The invention relates to electrical engineering, in particular the manufacture of magnetic cores for electrical induction apparatuses, for example, three-phase transformers. According to the main author. St. No. 970493 is known for a three-phase magnetic conductor for electrical induction apparatuses, consisting of three identical C-shaped plate parts connected by their ends so that they form two rums in the shape of a three-pointed star, in the center of which there are layers of plates having bevels and a transition section between bevels, connected by a veil, and a method of manufacturing such a magnetic circuit, including cutting electrical steel coils into tapes, stamping tapes on both sides of the V-shaped notches while retaining jumpers between them, winding O -shaped elements with the location of jumpers one above the other in the middle of two opposite straight sections of the elements, annealing, bandaging, separation of these elements into C-shaped parts and the assembly of these magnetic cores 1. The disadvantage of this magnetic circuit is an increase in losses and no-load current, tied with a decrease in the area of the junction of the C-shaped parts between themselves, caused by the presence of a transition section between the bevels of the plates. The purpose of the invention is to reduce losses and no-load currents. This goal is achieved by the fact that in a three-phase magnetic circuit for electric induction devices in the zone of connection of the C-shaped parts of the magnetic circuit, additional packages of triangular-shaped plates are attached to the side surfaces of the adjacent parts. FIG. 1 (a, b) shows the magnetic circuit, front and top view; in fig. 2 — node 1 in FIG. 1 (the connection of the plates in the center of the frame and the location of additional packages); in fig. 3 is a section A-A in FIG. 2 (on a larger scale); in fig. 4 is a section BB in FIG. 2 (on a larger scale); in fig. 5 - scanning the tape of the O-shaped element and triangular plates formed during the stamping; in fig. 6 is a triangular plate in FIG. 5. The three-phase magnetic circuit consists of three plate C-shaped parts 1, 2 and 3, which converge at their ends into a three-beam star. In the center of the star, the C-shaped plates are joined together in a doublet (Fig. 2 and 3). Additional packages 4 and 5 of triangular plates are installed in the zone of connection of the ends of the C-shaped parts of the magnetic conductor and docked to their side surfaces. At the same time, the gap between the joined surfaces is filled with magnetic adhesive 6 (Fig. 4). The arrows in FIG. Figure 2 shows the direction of rolled steel for electrical steel. The total magnetic flux passing through the junction of the spatial magnetic flux is l / Vs part of the total flux in the magnetic flux core. In this part of this stream passes through the connection in the cover, and the other part through additional packages. In this case, induction in the compound is reduced by binding. The use of magnetic glue reduces the magnetic resistance of the gap between the C-shaped parts and additional packages, which gives an additional decrease in induction at the joint. In the manufacture of the proposed magnetic circuit, triangular plates are formed during the stamping on the tapes of the V-shaped notches. FIG. 5 shows a strip of tape 7, from which the O-shaped element is wound, and triangular plates 8. The arrow indicates the direction of rolling electrical steel. When stamping the tape, the stamping body rotates periodically by angle X. Therefore, the angles on the plate are 60 °, ° C ° + OS. And 60 ° - oL. In FIG. 6 shows one plate, the arrow indicates the direction of hire. In the manufacture, these plates are annealed, packages are assembled from them, and installed on the magnetic core in the zone of connection of the C-shaped parts, observing the direction of rolling for all the plates in one direction. The proposed design of the magnetic circuit has low losses and no-load current, because induction at the junction of the parts of the magnetic circuit is reduced by binding. The increase in losses and no-load currents due to additional packages, which increase the total mass of steel, is significantly less than the reduction in losses and reactive power in the joint, and therefore the total losses and the reactive power of the magnetic circuit are reduced. It does not require additional costs of steel.

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Claims (1)

THREE-PHASE MAGNETIC WIRE FOR ELECTRICAL INDUCTION APPARATUS by ed. St. No. 970493, characterized in that, in order to reduce losses and idling current, in the zone of connection of the C-shaped parts of the magnetic circuit, additional packages of triangular-shaped plates are attached, joined to the side surfaces of adjacent parts. (L s a> I 103296