| Abstract |
Application of inverters with a phase number
equal to or greater than five opens up the possibility of
independent vector control of two or more ac machines, whose
stator multi-phase windings are connected in series. This paper
deals with a seven-phase supply system, which allows series
connection of three seven-phase machines, thus enabling a
saving of two inverter legs when compared to an equivalent
three-motor three-phase drive. It is shown that the drive concept
is independent of the type of ac machine used and that different
types can be freely mixed within the multi-motor drive.
Considerations are verified by simulation of a three-motor drive
consisting of an induction machine, a synchronous reluctance
machine and a permanent magnet synchronous machine. |
