Frequency tripling transformers

The possibility of making use of transformer harmonic phenomena for frequency multiplication has long been recognized, but practical applications have been few. Within recent years, however, several frequency tripling transformers have been built for supplying 180 cycle energy to large electric horns and similar devices from 60 cycle sources. The inherently poor regulation of the output voltage and low power factor of the input circuit can be compensated in part by the use of series capacitance in the output circuit; at the same time the maximum output is increased considerably. Two suggested practical applications of these devices are for supplying 180 cycle energy to induction furnaces and to high-speed motor-driven tools.