SU103063A1 - - Google Patents

Description

The invention relates to welding transformers with a double-core closed magnetic circuit, on one of the rods of which the primary winding and part of the secondary are located, and on the other - the rest of the latter, with a stationary magnetic shunt for controlling the welding current parallel to the cores of the magnetic circuit and separated from it non-magnetic gaps.

In known transformers of this type, welding current regulation is performed with. using a switch located directly on the transformer that changes the distribution coefficient of the secondary winding on the rods.

According to the invention, in order to remotely change the welding current, the magnetic shunt is made with two parallel branches (rods) connected by a transverse rod on which the control winding is located, fed by a direct current and used to change the magnetic resistance of the shunt by magnetizing its rods.

To switch sections, in order to change the distribution coefficient of the secondary winding on the rods, both parts of the said winding are made sectioned.

The scheme of the proposed welding transformer is shown in the drawing, where 1 is a two-core magnetic core, 2 is a magnetic shunt, B is a selenium rectifier, R is an adjusting rheostat, and I is a removable dial switch.

The primary winding Wi of the transformer is located jointly (concentrically) with a part of the secondary winding on one rod. The rest of the W-2a secondary winding is located on the other rod. Not.

The location of the secondary winding is characterized by the coefficient rac o,

prediction

W / 2o t Vv

To increase the use of active materials, two stages of distribution of the secondary winding are used: a 2 0.3 (upper position of the tapping switch) and a 2 0.5 (lower position of the chopper switch I). The GOST-set registration rate / Cf 4 can be obtained

at, 3 and 0.5,,: 5 „,

and ,, alcM, where Sj is the cross section of the steel of the magnetic shunt rod, S is the cross section of the steel of the transformer core, and Well is the strength of the magnetic component of the magnetic field generated by the control winding W in the magnetic shunt. The value of H. varies in the limits of a / cm, and Wy is the number of turns of the control winding, 1y is the control current in amperes, and 1y is the length of the average power line in a magnetic shunt in centimeters.

The control winding Wy is supplied with direct current from a selenium rectifier B. A rheostat R is used to control the control current and, therefore, the welding current.

In the proposed transformer there are no moving parts and variable air gaps, due to which there is no vibration of its parts. The transformer is silent and provides a very stable welding process over the entire control range (including low currents). The presence of an unregulated air gap 8 improves the shape of the welding current curve and increases the arc stability.

Subject invention

Claims (2)

1. A welding transformer with a double-core closed magnetic circuit, one of the rods of which contains the primary winding and a part of the secondary, and the other part of the latter, and a fixed magnetic shunt to control the welding current parallel to the magnetic cores and separated from it The magnetic gaps are distinguished by the fact that, in order to remotely change the welding current, the magnetic shunt is made with two parallel branches (rods) connected by a transverse rod, on The tap has a control winding fed by direct current and serving, and for changing the magnetic resistance of a shunt by biasing its rods. 2. Transformer according to claim 1, I distinguish w; and with the fact that both parts of the secondary winding are made partitioned to switch sections to change the distribution coefficient of this winding on the rods.