Modeling and control of a five-phase series-connected two-motor drive

The paper deals with a two-motor five-phase drive system with series connection of stator windings. Introduction of an appropriate phase transposition in the series connection leads to a complete decoupling of the flux/torque producing currents of one machine from the flux/torque producing currents of the second machine. Consequently, independent vector control of the two machines becomes possible, while using a single current-controlled five-phase voltage source inverter (VSI) as the supply. The drive system modeling and control are elaborated in the paper. A novel model of the complete drive and an associated vector control scheme are developed. Performance of the drive is investigated by simulation, using a detailed drive model. Both the concept of the drive and the approach to modeling and control are fully verified.