SU42228A1 - Single phase transformer - Google Patents

Description

In general, a number of cases have found quite wide application of electrical transformers and autotransformers with a strongly falling characteristic with increasing load. In particular, such transformers are used for electric welding with alternating current.

The falling characteristic in transformers can be achieved in various ways from which you can specify:

a) the use of a strong dispersion in the secondary winding;

b) a transformer with an arrangement of windings on different cores and a gap in the magnetic system:

c) use of the principle of magnetic shunt;

(d) Reactive or active resistance in the secondary circuit of the transformer;

e) application of a differential auxiliary secondary winding.

The present proposal relates to a type of transformer with windings located on different cores and an auxiliary winding connected in series with the primary or secondary windings.

This winding is placed relative to the magnetic system of the transformer so that the flux generated by it is

closes through both cores in the same direction and through the air or transformer casing.

In known structures of this type, the additional winding is usually located on the core between the main cores and an air gap separate from the rest of the magnetic system, or on the core parallel to the main cores and covered by the transformer common to all the cores.

According to the invention, the auxiliary winding is located on the core, which is attached at one end to the outer surface of the transformer frame in the interval between its main cores.

Such an arrangement reduces the size of the main magnetic system compared to transformers, in which an additional core is located in the transformer window.

In FIG. 1 depicts the scheme before. transformer, and FIG. 2 and 3 schemes of the latter in a slightly different form of execution.

According to FIG. 1 single-phase transformer for receiving a falling characteristic is provided with an auxiliary core 4, on which an additional winding 5 is laid, connected in series with the primary winding /.

The core 4 is made with an open magnetic circuit and is attached at one of its ends to the outer surface of the transformer ram (outside the window of the latter). :. .

The secondary winding 2 is located on a different core, which increases the dispersion and increases the steepness of the external characteristics of the transformer.

The winding 5 with the core 4 occupies an intermediate position between the action of the reactive coil, which is not magnetically connected with the magnetic system of the transformer and the core located in the window of the transformer.

Obviously, the effect of the operation of such a winding in quantitative terms also occupies an intermediate position between these methods of obtaining a falling characteristic.

The winding 5 can be connected in series with the transformer secondary winding.

The path for part of the magnetic lines 7 generated by the winding 5 will lie through the main cores (Fig. 1), whereby the flux in the primary core will be amplified (the consonant direction of the magnetic lines of the primary and additional windings) and the notes in the secondary winding-weakened (opposite direction of magnetic lines).

The main part of the flow of the winding 5 closes through the air and RMS of the transformer and causes an increase in the transformer dispersion.

According to the invention, two auxiliary serrated 4 VL 9 can be applied, attached to both rome and each equipped with auxiliary windings 5 and 5 (Fig. 2 and 3), which can be included in the primary circuit 10, 11 (Fig. 2 ), and in the secondary. In addition, it is possible, the circuit with the inclusion of an auxiliary winding in each of the circuits (Fig. 3).

The subject matter of the invention.

Claims (2)

1. A single-phase transformer, in particular a welding transformer, with main windings located on different solar panels and a universal winding-, connected in series with the primary or secondary windings and placed relative to the magnetic system of the transformer so that the flux generated by it closes through both cores in one direction and through the air or transformer casing, characterized in that said winding is superimposed on the core with an open magnetic circuit, attached at one end to the outer surface the yoke of the transformer (is the last window) between its cores. 2. The form of the transformer according to claim 1, characterized in that the additional winding is divided into two series-connected parts superimposed on two cores, which are attached in this way to both transformer rams. To the author's testimony I. I. 42228 ... ..., „; -. .t. . :. ; . .gd I G. Bermaia  } n fig. d figs five- .i 1  54 iif i g 31 f. | // city: fig { -about .