with DC energisation superimposed on AC energisation

Full Title

Motors with reciprocating, oscillating or vibrating magnet, armature or coil system (arrangements for handling mechanical energy structurally associated with motors H02K7/00, e.g. H02K7/06) > with armatures moved one way by energisation of a single coil system and returned by mechanical force, e.g. by springs > wherein the frequency of operation is determined by the frequency of uninterrupted AC energisation > with DC energisation superimposed on AC energisation