SU1436136A1 - High-frequency transformer - Google Patents

Abstract

The invention relates to electrothermal and is intended for induction heating of metals. The aim of the invention is to increase the efficiency of a transformer by reducing the power loss and expanding the application area by using it in high power installations. The transformer consists of the spiral winding 1, the secondary single-turn winding 2 connected in series with the primary winding, the ground bus 3, and the terminals 4 of the transformer. The turns of the primary winding 1 have a variable height in the vertical plane, the height of each of the subsequent turns, calculated from the outer section, as it approaches the secondary winding, exceeds the height of the first turn of the first external turn. The secondary winding 2 can be located between the windings of the primary winding. The windings of the primary winding in this design, arranged in pairs symmetrically with respect to the secondary winding, have the same height of 1 Cp. Ft., 6 sludge. (L

Description

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The invention relates to electrothermal, in particular, induction heating of metals, and can be used in electrothermal installations for high-frequency metal welding, melting, soldering, quenching, etc.

The purpose of the invention is to increase efficiency by reducing the power loss and expanding the scope of application due to the use of high-power plants in installations

1 shows a transformer, a general view; Fig. 3 is a diagram of the distribution of the magnetic flux in the windings; and Fig. 4, an electrical circuit in Fig. 5, a section along the vertical axis when the secondary winding is placed between the turns of the primary coil in Fig. 6; primary winding.

The transformer consists of the spiral primary winding 1, the secondary single-turn winding 2 connected in series with the primary winding of the ground bus 3, the transformer leads 4 and 5, the secondary winding 2 and the magnetic core 6. During operation, the leads of the transformer 4 are connected to the capacitor bank of the oscillating circuit, and the leads 5 secondary winding - to the load (battery and load not shown). The coils of the first winding 1 have a variable height in the vertical plane (Fig. 6), the height of each of the subsequent turns counting from the outer section as it approaches the secondary winding exceeds the height of the previous one by the height of the first outer turn. The secondary winding 2 may be located between the turns of the primary winding (FIG. 3). The turns of the primary winding in this structure, arranged in pairs symmetrically with respect to the secondary winding, have the same height.

High-frequency transformer operates as follows.

When connecting transformer 4 to the source of high-frequency current through its windings, current flows through the primary winding current 1 through the secondary winding current 1 directed opposite to current 1, and through the load their sum,

With small gaps between the turns of the primary winding in areas ab ,; where magnetic fluxes flow in the opposite direction, the magnetic flux in the gap is sharply weakened, which also causes a low current density. In sections aa and bb, at a height equal to the height of the outer coil, the magnetic flux increases sharply, causing a current in each section equal to about half the current of the primary winding. Thus, with this design, the total losses in the turns of the primary winding are significantly reduced compared with a coil whose turns have the same height, selected from the conditions of the permissible current load. This leads to an increase in the efficiency of the transformer. This conclusion is due to the excise of the magnetic flux distribution in Fig. 3.

0 It also shows the total flow loop flowing in the transformer windings.

The loss reduction also allows the use of this transformer in higher power installations as compared to known transformers.

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Claims (2)

1. A high frequency transformer containing a multi-turn primary winding, which in axial section is a flat helix with hollow turns of variable cross section, a single-turn secondary winding connected in series with the primary winding, and a magnetic circuit, characterized in that, in order to increase the efficiency of the transformer by reducing power losses and expansion will have application due to the use in high-power installations, the turns of the primary and secondary windings are made of sheet, the turns of the primary winding have changes th height in a vertical plane, so that the height of each of the subsequent turns of the primary winding, counting from the outer, in section as approaching to the secondary winding exceeds the height to the height of the preceding first outer coil. 2. Transformer according to claim 1, about the fact that the secondary winding is located between the turns 5 of the primary winding of the primary winding, arranged in pairs symmetrically with respect to the secondary winding, have the same height. 0 five 0 five 0 ag 2 pinch (Rig.6