SU405676A1

SU405676A1 - POWER SUPPLY FOR ARC PERMANENT AND ALTERNATING CURRENT

Info

Publication number: SU405676A1
Application number: SU1613796A
Authority: SU
Priority date: 1971-01-25
Filing date: 1971-01-25
Publication date: 1973-11-05

Description

1one

Известны источники питани дл дуговой сварки посто нным и переменным током, содержащие источник переменного напр жени с трехфазной обмоткой и блок силовых выпр митev eй .Power sources for DC and AC arc welding are known, which contain a three-phase alternating voltage source and a power rectifier unit.

При сварке посто нным током нагрузка включаетс на выход выпр мительного блока, а при сварке переменным током - на линейное или фазное напр жение обмотки переменного тока до выпр мительного блока.In direct current welding, the load is switched on at the output of the rectifier unit, and in alternating current welding, at the linear or phase voltage of the alternating current winding up to the rectifier unit.

Недостатком таких источников вл етс неполное использование трехфазной обмотки при сварке переменным током и недостаточное дл устойчивого возбуждени и горени однофазной дуги напр жение холостого хода.The disadvantage of such sources is the incomplete use of the three-phase winding when welding with alternating current and the no-load voltage insufficient for sustained excitation and burning of a single-phase arc.

С целью повышени напр жени холостого хода обмотки источника снабжаютс отпайками либо переключател ми дл соединени по схеме «звезда и «треугольник.In order to increase the no-load voltage, the source windings are supplied with taps or switches for connection according to the "star and" triangle scheme.

С целью расширени области применени предлагаемого источника и упрощени его конструкцин его обмотка выполнена с посто нным соединением двух фаз трехфазной обмотки в неполную звезду, а треть фаза св зана с двум другими с помошью переключател .In order to expand the field of application of the proposed source and simplify its construction, its winding is made with the constant connection of two phases of a three-phase winding into an incomplete star, and the third phase is connected to the other two with a switch.

С целью сварки посто нным током треть фаза обмотки соединена с двум другими фазами по схеме полной звезды на выпр мительный мост.For the purpose of direct current welding, the third phase of the winding is connected to two other phases according to the scheme of a full star to a rectifying bridge.

С целью получени напр жени однофазного переменного тока, повышенного на 27% по сравнению с линейным напр лсением, обмотка третьей фазы соединена с обмотками двух других фаз последовательно. На фиг. 1 приведена электрическа схема источника с использованием синхронного генератора; на фиг. 2 дана векторна диаграмма токов, переключатель в положении I (фиг I); на фиг. 3-то же, переключатель в положенииIn order to obtain a single-phase AC voltage, increased by 27% compared with a linear voltage, the third phase winding is connected to the windings of the other two phases in series. FIG. 1 shows the electrical circuit of the source using a synchronous generator; in fig. 2 is a vector diagram of currents, a switch in position I (FIG. I); in fig. 3 same switch in position

И (фиг. 1).And (Fig. 1).

Преимущества такого источника видны на примере использовани трехфазного бесконттактного синхронного генератора повышенной частоты со встроенным выпр мителем (фиг.The advantages of such a source are seen in the example of using a three-phase, high-frequency, non-contact synchronous generator of high frequency with a built-in rectifier (Fig.

Claims

1,2,3).

When connecting the three-phase winding according to the star circuit (switch in position I in Fig. 1) and with the bridge rectifier switched on, the no-load voltage

at its output is equal to C / d.o. 2.35 f / ph. Oo, where the i.o.-phase voltage of the winding of the generator core when idling (Fig. 2).

With a serial connection of the phases of the winding core (switch in position P

in fig. 1) at the output terminals of the winding, a single-phase alternating voltage ip. (Fig. 3), i.e., 27% more than the linear voltage of the three-phase system. As a result, for example, when

and f.o. 35 in the open circuit voltage of the direct current and alternating current, respectively, are f / d.o.85 8 and f / ff.

Subject invention

The power source for arc welding with direct and alternating current, containing an alternating voltage source with a three-phase winding and a power rectifier unit, characterized in that, in order to broaden the scope of the source and simplify its design, its winding is made with a permanent connection of two phases to an incomplete star.

and the third phase is connected to the other two with the help of a switch.

2. A source according to claim 1, characterized in that, in order to provide direct current welding, the 7th phase of the winding is connected to two other phases in a half star scheme to a rectifying bridge.

3. The source of claim I, characterized in that, in order to obtain a single-phase alternating current voltage increased by 27% compared with a linear voltage,. the winding of the third phase is connected with the windings of the other two phases in series.

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