Cycloconverter

(Lander 1993, p. 188)[3] Output waveform quality improves as the pulse number of switching-device bridges in phase-shifted configuration increases in CCV's input.

CCVs are used for driving mine hoists, rolling mill main motors,[4] ball mills for ore processing, cement kilns, ship propulsion systems,[5] slip power recovery wound-rotor induction motors (i.e., Scherbius drives) and aircraft 400 Hz power generation.

A fully loaded "hard start" for such equipment would essentially be applying full power to a stalled motor.

Previously, SCR-controlled DC motors were used, needing regular brush/commutator servicing and delivering lower efficiency.

Cycloconverter-driven synchronous motors need less maintenance and give greater reliability and efficiency.