C-47 Skytrain by Larry Davis

By Larry Davis

C47 Skytrain in motion

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If now we place brushes on the commutator at right angles to the normal brushes, as shown in Figure 5 . 1 , a voltage will appear at this new position. We now have a rotary amplifier. 2. 2 Rotary amplifier with applied load A very small field flux will produce a short-circuit current sufficient to generate the maximum voltage of the machine at the secondary brushes, and the resultant cross-flux effect almost cancels the field flux. In this way the load current is almost directly proportional to the excitation.

To ensure stable operation and correct sharing of reactive kVA the generator voltage should droop slightly with increasing lagging reactive kVA load. 8) by connecting a current transformer in the generator output to feed a load current dependent signal into the sensing circuit of the regulator. This signal is arranged to make the droop zero at unity power factor and a maximum at zero power factor lagging. The droop of each of the generators working in parallel should be the same if equal sharing is to be achieved.

Various methods have been adopted for this. 8). c. c. supply for the generator field winding. g. three-phase star or six-phase star are sometimes used. Some designs use thyristors but it is more common for all the devices to be silicon diodes. Diodes are available in either polarity so it is essential when fitting replacements to maintain correct polarity. Alternatively some diodes are of a double-sided construction in which case it is essential to fit them the correct way round. Not all diodes are clearly marked but by using an Avometer or similar instrument the conducting direction can be determined.

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