SU63849A1 - Three Phase Welding Transformer - Google Patents

Description

The proposed three-phase welding transformer is a kind of three-phase armored transformer with a symmetrical magnetic circuit and single-turn secondary windings and is intended mainly for powering three-phase spot welding machines and special purpose semi-automatic machines.

The essence of the invention, consisting in the original configuration and laminating of the magnetic circuit and the construction of the secondary winding, is illustrated in a sketch drawing, fig. 1 which shows a cross-section of the proposed transformer on CD, and in FIG. 2 is a longitudinal section through AB.

The magnetic core is assembled from sheets 1, 2, having the form of an open square 1 with two sides located at an angle of 120 to each other, and with a process 2 facing the inside of this angle.

The shoots 2, when assembling the sheets, are arranged radially against each other and form three cores for the primary windings 3. The sides of the square 1 form at the same time a six-sided closed outer magnetic circuit with three

Windows 4. In these windows, a secondary winding is inserted between the internal edges of the secondary magnetic core and the primary windings 3. The latter can be formed by three rods 5, located in windows 4 and electrically connected from the side of the lower end of the transformer (Fig. 2). The secondary winding can be made of hollow, for example triangular cross-section, tubes and provided with nozzles 6 and 7 for the entry and exit of cooling water.

In this design, the secondary winding is coupled to the magnetic flux, the magnitude of which relates to the magnitude of the flux L1 associated with the primary winding, as

one :

According to the instructions of the inventor, his preliminary calculations showed that a transformer of this design has a very small scattering reactor (less than 3%) and a small specific gravity and envelope.

The symmetrical pinout of the secondary winding makes it possible to almost perfectly equalize the induction resistances of the phases of the secondary circuit; In addition, these resistances are minimized, which is especially important when using a transformer in spot welding machines and semiautomatic devices (as this ensures the identical welding of points at the licex phases) and allows welding of large total thicknesses with a relatively low transformer power.

The possibility of using one relatively simple die for cutting iron sheets 1, 2 of the transformer magnetic core, as well as the simple configuration of the secondary winding, make it possible to organize the production of the proposed transformers without high development costs.

Subject invention

Claims (2)

1. A three-phase armored-type welding transformer with a symmetrical arrangement of the cores of the primary windings and single-turn secondary windings, characterized in that the sheets from which the magnetic core is assembled are cut in the form of open squares with two sides arranged at an angle of 120 ° to each other and the processes facing the inside of this angle, located at assembly radially against each other and forming three cores for the nervous windings, while the sides of the squares form a hexagonal closure fifth outer magnetic core with three windows for v.mescheni secondary windings between the outer faces of the magnetic core and the primary windings. 2. A transformer according to claim 1, characterized in that the secondary winding is formed by three rods located in the windows and electrically connected on the side of one of the ends of the transformer.