SU75473A1 - Power amplifier - Google Patents

Description

The subject matter of the present invention relates to electrically-controlled amplifiers made in the form of a four-pole DC machine with two pairs of mutually perpendicular brushes.

According to the invention, in order to obtain a bipolar magnetic flux of control, it is proposed to place the control windings on two diametrically opposite poles of the same name.

FIG. 1 and 2 shows the electrical circuit of the proposed amplifier, providing two-stage and three-stage amplification.

In order to obtain multi-stage amplification in one electric machine, the principle of independence e is used. d. in the winding core, having a certain number of poles, from the magnetic flux generated in this machine and having a different number of poles. So, for example, in four-pole machines with loop windings, magnetic fluxes can be used at amplifications at intervals corresponding to a bipolar distribution of induction around the circumference of the core.

In the proposed electromachine amplifier measles and magnetic

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The system is made like a normal four-pole DC machine. Four brushes 1, 2, 3 and 4 are located on the collector. One pair of these brushes 7 and 5 is short-circuited or through compensation windings / C and windings of additional poles E, the normal field winding F is attached to the second pair of brushes 2 and 4

The control windings FI-m F are located on the two diameters of the opposite opposite (same-name) main poles of the machine, which provides a bipolar magnetic flux control. The load is connected between the midpoint of the chain of brushes / and .3 and the midpoint of the chain of brushes 2 and 4.

When using such a circuit to turn on windings in a four-pole machine, three systems of magnetic fluxes can be used — two two-shells, and one four-pole, and therefore both two-stage (Fig. 1) and three-stage (Fig. 2) gain circuits can be performed.

In both cases, the machine can have either one load circuit or two isolated load circuits (the second

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load circuit is shown in the diagram by a dotted line).

To ensure symmetry, each of the windings K, FI and FZ must be placed at two opposite poles. In order to obtain the desired characteristics, serial windings, positive feedback windings, etc. can be introduced into the circuit of the proposed amplifier.

This principle of building multi-stage electric amplifiers can also be extended to DC machines with a large number of poles.

Subject invention

A power amplifier with a magnetic system and the core of a four-pole DC machine, with two pairs of mutually perpendicular rods, of which one pair is short-circuited or through the stator windings of the machine, and the second is connected to the winding | obtaining a bipolar magnetic flux control, a control winding stirring, on two diametrically opposite poles of the same name.

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