The uninterrupted electric power supply system of the present system includes: a control means(5); a synchronous machine (1) having an electric motor means (1M) and an alternator means (1A), the electric motor means being arranged to be fed by the network (10), and the electric motor means (1M) being...http://www.google.com/patents/US6320279?utm_source=gb-gplus-sharePatent US6320279 - Uninterrupted electric power supply system
