A high voltage, single-stage variable speed motor power supply utilizes direct AC-to-AC converters that do not have any intermediate DC link, along with a multi-level, multi-phase, multi-circuit variable speed motor drive and a motor in which a stator is wound with a number of multi-phase circuits. Each...http://www.google.es/patents/US6118932?utm_source=gb-gplus-sharePatente US6118932 - Method and arrangement for a high voltage single-stage variable speed drive
Method and arrangement for a high voltage single-stage variable speed drive
