SU105902A1 - Single core dc to ac converter - Google Patents

Description

A single DC-to-AC core transducer is proposed, having a longitudinal excitation winding, which creates a transverse ed-C in the cortex.

The proposed converter is characterized in that it makes it possible to vary the ratio between the direct and alternating current voltages.

This is achieved by using an additional transverse excitation winding, in which the current is regulated and which excites the longitudinal EMF in the cortex, affecting the emf value. AC, not acting on the DC circuit.

FIG. 1 is a schematic diagram of the proposed converter; in fig. 2-vector diagram explaining the principle of its operation.

At the poles there are two excitation windings W /, and Wt, which create a magnetic flux F (Fig. 2), which has a longitudinal and transverse F | components. The first creates transverse emf. Ei. proportional emf direct current, and the second - longitudinal emf. El, which does not act on the DC circuit. Emf EI is changed by adjusting the current / transverse winding. In this case, the resulting magnetic flux Фе changes its position in space, and this is achieved by regulating the output parameters of the converter, i.e. the change in the ratio between the DC and AC voltages.

The source of direct current is the battery connected to the brushes of the box. Its coil, in addition to the collector, is connected to three slip rings, from which alternating current is removed.

To maintain the desired frequency, the rotation speed of the converter can be adjusted by changing the current in the field winding.

Co. 105902-2 -

In the case of converting direct current into alternating current and supplying an independent alternating current network, the balance of magnetizing reaction forces of the core from direct and alternating current is disturbed. At a constant power output, due to a change in the angle between the transverse EI and the resultant -Ds, as well as a change in voltage and (therefore, the current /), an unbalanced normal component occurs, which can degrade the commutation.

To improve switching, the Wy winding is positioned so that it does not cover the switching zone.

For this purpose, devices are provided that eliminate the effect of transverse reactions of the core against direct and alternating current. As such a device, you can use a DC generator, the measles of which is equipped with a three-phase winding connected in series with a three-phase winding of the converter.

To maintain the speed of rotation of the core, and therefore the frequency of the alternating current, it is necessary to compensate for the longitudinal reaction of the core from this current. Compensation is carried out by a winding mapgin located along the longitudinal axis, the current in which is regulated, for example, by means of a frequency regulator or a direct current generator with a three-coil winding connected in series with a three-phase converter winding and additional brushes on the collector.

Present Invention

Claims (3)

1. A single-core DC-to-AC converter, equipped with a longitudinal excitation winding, creating a transverse emf in the cortex, characterized in that, in order to change the ratio between DC and non-random current, the winding is additionally applied transverse excitation, in which the current is regulated automatically or automatically and which excites the longitudinal emf in the cortex, affecting the emf value. AC, but not acting on the DC circuit. 2. The converter according to claim 1, characterized in that, in order to create satisfactory commutation on the collector, devices are used to eliminate the influence of cross-sectional reactions of the core from constant and non-temporary currents (each separately or together), for example, an auxiliary generator, in particular DC generator, the measles of which is equipped with a three-phase winding connected in series with a three-phase winding of the converter. 3. Converter on Mon. 1-2, characterized in that, in order to compensate for the longitudinal reaction of the core from the alternating current, a winding is arranged along the longitudinal axis of the mashina, in which the current is regulated automatically or automatically, for example, by using a frequency regulator or a DC generator with a three-phase winding connected in series with the three-phase winding of the converter and with additional brushes on the collector.