Independent voltage control for series connected six-phase and three-phase induction machines

A lot of relevant concepts related to series connection and independent control of multiphase machines supplied from a single current-controlled voltage source inverter have been recently demonstrated by some researchers. These previous evaluation give a great contribution to further improvements of multimachine series connected applications. Following the initial proposition, which includes an evaluation based on the general theory of electrical machines, this paper evaluates PWM schemes for two-motor series connected motor drive. The goal of this paper is to show how to achieve independent voltage control and to evaluate the switched voltage profile in the motors windings. Scalar and vector approach are addressed and, simulation and experimental results are shown to illustrate details discussed in the paper.