SU699616A1 - Power-diode generator - Google Patents

Description

(54) VENTILATION GENERATOR

one

The invention relates to electrical engineering and can be used in generators that require special type of output characteristics, such as generators for electric arc welding.

Valve welding generators are known in which external static volt-ampere characteristics necessary for welding are formed by selecting the magnitude of the core phase impedance, as well as due to reverse current and voltage static links acting on the excitation circuit of the generators. These generators consist of ac machines with a power core winding feeding the welding arc through the rectifying unit 1.

Their disadvantage is the complexity of the regulating apparatus, as well as the poor use of the machine, since, due to the need to ensure both high idling voltage and a hard characteristic in welding mode, the machine has to be performed with excessive winding data.

Another valve welding generator is known which has at least two main windings which change their output voltage and, the rank of the welding current due to the use of a special switch 2.

The disadvantage of this generator is the need for a complex switching apparatus.

The closest technical

0, a valve generator comprising at least two crust windings each connected to its rectifier unit. The rectifying units are connected in parallel by direct current, with one winding made of high voltage 3.

The disadvantage of such a generator is the continuous shape of the voltage curve of the high voltage winding, which makes it difficult to quench the arc during technological breaks, as well as the insufficient steepness of the falling part of the external characteristics of this winding due to the low inductive resistance, which, when the generator operates in kojxjTKoro modes, causes when welding, can lead to the exit of the coils from the line.

The aim of the invention is to improve the quality of the welding arc and increase the reliability of the generator.

This is achieved by the fact that the high-voltage winding is two-phase with a shift between the phases 90 el. hail, and the rectifier unit of this winding is made half-wave, with the ends of the winding phases combined and connected to the negative terminal of the other rectifier. High-voltage winding is placed in the grooves of the core on the arc, not a multiple of the double pole division.

FIG. Figure 1 shows the basic electrical circuit of the proposed generator; in FIG. 2 - the location of the core windings, the preferred option; in fig. 3 - external characteristics of the generator.

A two-phase high-voltage additional core winding 1 through a half-wave rectifier. The Ely block 2 (Fig. 1) is connected parallel to the output of the generator power circuit consisting of a three-phase power winding 3 connected in a triangle or in a star and feeding the welding bridge 4 through a power rectifying block 5. The winding of the inductor 6 is powered by an extraneous source of constant current. The three-phase power winding 3 core 7 is located in sector 8 (Fig. 2) or around the entire circumference of core 7, and the high-voltage winding is concentrated in sector 9, which encloses an incomplete double pole division.

The generator works as follows.

When turning on only the olea winding for a variable load, a gently dipping external characteristic 10 (Fig. 3) is obtained, and when the high-voltage winding is turned on, characteristic 11 is obtained.

In parallel operation of both core windings, a total external static characteristic 12 is provided, the configuration of which allows one to achieve the set goal.

In the general case, the high-voltage winding can be performed with any number of phases and its rectifier unit can operate according to any rectifier pattern. However, in the case of welding with technological breaks of the arc, it is most expedient to perform this. tied winding with the number of phases smaller than the number of phases of the power winding, and the rectifier unit is half wave. In this case, the resulting breaks between rectified pulses in curve A of the no-load voltage of the generator make it easier to break the arc when the electrode is sharply separated from the product. On the other hand, the voltage pulses of the high-voltage winding provide reliable initial and re-excitation of the arc,

Claims (3)

1. A valve generator containing at least two main windings, one of which is high-voltage, connected to separate rectifier units connected in a circuit 25 DC in parallel, characterized in that, in order to improve the quality of the welding arc and increase reliability, the high-voltage winding is made two-phase with a shift between 90 electr phases., And the rectifier unit of this winding is half-wave, and the winding phases are connected and connected to the negative terminal of another rectifier unit, 2. The generator Pbp.1, is distinguished by the fact and with that, almost high-voltage The winding is located in the slots of the core on the arc. Circles that are not multiple to double pole division. Sources of information taken into account in the examination 45 1 USSR Author's Certificate No. 266974, cl. 23 K 9/00, 1969. 2. The author's certificate of the USSR 197828, cl. 23 K 9/00, 1965. 3. The patent of Germany No. 2600035, 50 cl. H 02 K 29/02, 15.06.76.