Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by dynamic converters using mechanical contact-making and -breaking parts wherein the parts are rotating and collectors co-operate with brushes or rollers
Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by dynamic converters using mechanical contact-making and -breaking parts wherein the parts are rotating and collectors co-operate with brushes or rollers