Verfahren zum Betreiben einer Drehfeldmaschine und Wechselrichter dafuer

Eine Sechs-Phasen-Drehfeldmaschine wird betrachtet als Kombination aus zwei Drei-Phasen-Drehfeldmaschinen. Die zwei Drehfeldmaschinen werden durch einen gemeinsamen Sechs-Phasen-Wechselrichter versorgt. Die Schalter (S11, S12, S21, ..., S32') des Wechselrichters werden durch eine Steuerschaltung (CTL) so angesteuert, dass sie zu verschiedenen Zeiten Strom aus dem Wechselrichter ziehen.

WO2005034333 A UPAB: 20050527 NOVELTY - The operating method uses a current inverter with an intermediate DC circuit supplying switched current paths, corresponding in number to the number of induction machine phases (U1,V1,W1,U1',V1',W1'), with operation of the switches (S11,S12,...S32') via a control circuit (CTL). In each successive operating cycle of the induction machine a required voltage vector is determined, the switching sequences for the switches selected for operation of the induction machine as 2 separate induction machines, each having half the total number of phases. DETAILED DESCRIPTION - An INDEPENDENT CLAIM for a current inverter for operation of a multi-phase induction machine is also included. USE - The operating method is used for a multi-phase induction machine with an even number of 4 or more phases. ADVANTAGE - Operating method reduces variations in intermediate circuit current or voltage.