SU189089A1 - TRANSFORMER - Google Patents

Description

Transformers are known to contain a double-core magnetic core, primary and secondary windings, each of which is divided into two slave electrically connected coils located on different magnetic cores, and a magnetic shunt with a bias winding located in a developed secondary winding window. However, the use of these transformers for arc welding at non-temporal current is limited, since with a decrease in the welding current at a certain no-load voltage, the stability and elasticity of the arc decrease, which complicates the work of the welding and reduces labor productivity. In order to ensure proper arc stability over the entire welding current control range, it is advisable to decrease the voltage of the transformer with a decrease in the latter, respectively.

In the described transformer with a non-smooth regulation of the idling voltage, depending on the welding current, the primary winding of each rod is made in the form of two successively connected coils — the main and additional. Moreover, an additional coil covers the core of the main magnetic circuit and the magnetic shunt rods, or only the rods of the magnetic shunt.

FIG. 1 depicted: the electrical circuit of the proposed welding transformer; in fig. 2 shows the constructive arrangement of the power and control (magnetic, her) windings on the cores of the magnetic cores.

The transformer has two core-core magnetic cores — main / and additional 2. The latter, similarly to a magnetic amplifier of magnetic amplifiers, is split into two halves located symmetrically but on both sides of the main magnetic receiver in parallel configurations. Only an additional magnetic circuit is magnetized by means of a magnetising non-magnetised winding 5 on it. In order to decouple this winding from the induced emf. the main frequency of its part (section), located on different halves of the additional magnetic core, are connected counter-successively. The power windings are nervous 4 and secondary 5 are broken but the rods of the magnetic conductors are divided into two equal parts, each of which is connected successively. Perhaps (sometimes even advisable) and their parallel connection.

The primary winding of the transformer consists of two serially connected parts, one of which is located on the main magnetic circuit, and the second 6 - covers together with the secondary winding 5 Rods of both magnetic cores with windings located on them. The principle of operation of the transformer is as follows. In the absence of bias in idle mode, the magnetic flux created by the primary winding is distributed spontaneously between the magnetic cores. In this case, the total flux of magnetic conductors interlocking with the secondary winding has a maximum value. Accordingly, the U -75 V voltage induced in this winding is maximal. With the appearance of bias, a forced redistribution of fluxes in the magnetic cores occurs — part of the variable component of the flow of the additional magnetic circuit is displaced and the main magnetic circuit. In this case, the total flux coupled to the secondary winding is slightly reduced. With maximum biasing, almost the entire alternating current is closed only along the main magnetic conductor and decreases to its minimum value, despite the fact that the no-load current and the corresponding magnetizing force of the primary winding acquire their highest values in this mode. Consequently, the transformer secondary winding induced in the maximum biasing mode has a minimum value of. By smoothly changing the bias winding current from zero to nominal, it is also possible to smoothly reduce the no-load voltage of the transformer from 75 to 60 volts. When the transformer operates on a load, a change in the bias current also causes a corresponding change in the load current. With an increase in the current - magnetising from zero to the nominal load current (welding) at a nominal voltage across the load (arc) Hz -30 V increases from J.ZMUH to IzMuKc. Obviously, each value of the bias current will correspond to a specific welding current and no-load voltage. transformer. Thus, due to the fact that in a developed transformer secondary winding window, apart from the main one, there is also an additional magnetic circuit, through which the dissipation flow of this winding, adjustable by biasing, closes, the transformer has continuously adjustable steeply dipping external characteristics required for steady arc welding during manual welding. Due to the fact that the primary winding of the transformer contains, in addition to the main part, an additional, covering both magnetic cores (it can cover only the magnetic magnetized magnetic circuit), it is possible to regulate the flow generated by this part of the winding in the additional magnetic core by varying the open-circuit voltage of the transformer. In the absence of an additional winding 6, the transformer will have only continuously adjustable steeply dipping external characteristics with an unchanged idling voltage. The subject matter of the invention 1. A transformer, for example, for arc welding, containing a double-core magnetic core, primary and secondary windings, each of which is divided into two equal electrically connected coils located on different magnetic core rods, and a magnetic shunt with a magnetic bias winding located in developed windows secondary winding, characterized in that, in order to smoothly regulate the idle voltage depending on the welding current, the primary winding of each rod is made in the form of two no connected coils - basic and additional, wherein additional coil covers magnntoprovoda rod core and shunt magnetic rods. 2. A transformer according to claim 1, characterized in that the additional primary winding coil covers only the rods of the magnetic shunt.

L, 6 -5