SU61122A1 - Transformer - Google Patents

Description

Known transformers with a secondary winding having a single turn, made in the form of an unclosed hollow toroid, inside which are located the turns of the primary winding.

The proposed transformer differs from those known in that, in order to make such a transformer heartless, to cause induction heaters to generate high frequency currents, the toroid is made of a non-magnetic material. In addition, in order to evenly distribute the current in the secondary turn, the turns of the primary winding are located in the cross section of the toroid eccentric. FIG. 1 shows the proposed transformer, top view (I variant); in fig. 2 - diametral section; in fig. 3 - the proposed transformer, top view (option II); in fig. 4 - diametral section.

The proposed transformer without an iron core consists of two windings: the primary / and secondary 2, inside which the product is hardened or the metal is melted. The primary winding of the required number of coils is located inside the cavity of the secondary coil, the shape of which in section is chosen so that the magnetic field lines from the primary coil are tangent to the surface of the secondary coil to eliminate the harmful local Foucault currents in the non-magnetic metal from which the secondary winding is made. The ends of the secondary winding (coil) are spaced from each other at a distance of about 3-5 mm.

The proposed transformer has a low ohmic resistance and does not have self-induction dissipated in the secondary winding, the presence of which reduces the device efficiency. The use of a transformer without self-induction dissipated in the secondary winding, which does not require the inclusion of capacitors in the secondary circuit, reduces installation costs, increases reliability and simplifies operation. Besides

In addition, one generator set can power a number of such transformers located at workplaces and far from generators. The wavelength of the generator is selected depending on the material, the size of the heated product and the desired depth of heating.

Subject invention

Claims (2)

1, A secondary winding transformer having a single turn, made in the form of an unclosed hollow toroid, inside of which are located the turns of the primary winding, characterized in that the toroid is made of non-magnetic material to make it coreless to feed the induction heating systems . 2. The form of the transformer according to claim 1, characterized in that, in order to evenly distribute the current over the surface of the secondary coil, the turns of the primary winding are arranged eccentrically in the cross section of the toroid. fig I FIG. 2 FIG.