SU1658223A1 - Spiral spatial magnetic circuit of three-phase transformer - Google Patents

Abstract

The invention relates to electrical engineering, in particular to transformers. The aim of the invention is to improve the mass and energy characteristics, simplifying the manufacturing technology. Each frame element is wound from a tape of variable width around the axis. which forms a rectangular trapezoid in cross section. One of the edges 5 of the tape is in a plane perpendicular to the axis of the winding, and the other edge 7 is in a plane inclined at an angle of 60 °. to the axis of naviv ki. 4 yl

Description

The invention relates to electrical engineering, in particular, to the construction of twisted spatial magnetic cores of induction apparatuses, and can be used in the manufacture of the active part of three-phase transformers.

The purpose of the invention is to improve the mass-size and energy characteristics of the transformer and simplify the technology.

FIG. 1 shows the spatial magnetic circuit of a three-phase transformer, general view; Fig. 2 is a diagram of cutting transformer steel strips into oblique strips for making a frame element; on fig.Z - frame element, cross section; figure 4 - twisted spatial magnetic Assembly with windings.

The magnetic core (Fig. 1) contains three frame elements 1 connected to a closed triangle, matching rods

which form the core 2 magnetic conductor. The frame 3 of the frame element is cut 4 to assemble the magnetic core with separately executed windings (not shown). Each frame element 1 is wound from one electrical steel strip (FIG. 2), one of which is longitudinal loud 5 perpendicular to the axis of the winding of the element and forms a base plane 6 (FIG. 3) perpendicular to the winding from this side and perpendicular to the axis of the winding the other longitudinal edge 7 (figure 2) along the entire length of the strip has a constant inclination relative to the first edge with an angle of 60 ° to the axis of winding and, when wound on the opposite side of the element, beveled surface 8 (FIG. 3), mating with similar surfaces neighboring frame element s in the spatial magnetic conduit. moreover, the element in cross section

is a rectangular trapezoid 9 with an angle at the base of 60 °, the height of which lies in the base plane of the element, ensuring the bevel angle of the mating surface of the element to which the lateral side of the trapezium belongs, and the base of the trapezium lies in parallel planes of the frame element compressing the element across the entire thickness of the cross section perpendicular to the surface of its turns. The geometrical dimensions of the cross section of the frame element 9 (Fig. 2, 3) and the oblique strip for its manufacture, depending on the width of the open band, the cross section area of the magnetic core and the window size of the frame element, are chosen from the condition:

F-I-0)

AT

where B is the width of the opened strip. mm;

S is the section area of the core of the magnetic circuit, mm;

F is the thickness of the windings of the turns of the frame element, mm;

a - 0.5 (B - F. tg 30 °), (2) where a is the width of the end of the oblique strip, mm,

b - 0.5 (B + F tg 30 °), (3) where b is the width of the beginning of the oblique strip, mm;

p-F (2R + F),

L is the length of the strip, mm;

R is the radius of a circle whose perimeter length is equal to the perimeter of the window of the frame element, mm;

ft - steel strip thickness, mm.

The cross section of the spatial magnetic core is a multi-

The square 10 (Fig. 4), the shape of which, due to the presence of the cut 4 (Fig. 1), repeats separately performed windings 11 (Fig. 4), economically using the volume presented for their placement.

The use of the invention allows to improve the weight and size characteristics of the transformer by reducing the consumption of transformer steel, reducing

10 consumption of winding materials, oil and black rolled products, simultaneously improve energy performance by reducing current losses, simplify the manufacturing technology by eliminating the need to use special devices and fittings to obtain the bevel angle of the mating surface of the element and ensure its safety during the production of the transformer.

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Claims (1)

Claims of the invention A twisted spatial magnetic conductor of a three-phase transformer containing three conjugated into a closed a triangle of a frame element with a split rm, wound each from one strip of electrical steel, which is different. that, in order to improve mass and energy and energy characteristics, to simplify the manufacturing technology, each frame element is made of a tape of variable width, wound so as to form a rectangular trapezium in the section, with one of the edges of the tape in a plane perpendicular to axis winding, and another edge of the tape is at an angle of 60 ° to the axis of winding. 557 FIG. 2 YU