Indirect rotor flux oriented control of a seven-phase induction motor drive

Multi-phase ac motor drives are nowadays considered for numerous applications, due to numerous advantages that they offer when compared to their three-phase counterparts. In principle, control methods for multi-phase machines are the same as for three-phase machines. This paper analyses operation of an indirect rotor flux oriented controlled seven-phase induction machine with current control in the stationary reference frame. Performance, obtainable with hysteresis current control, is illustrated for a number of operating conditions on the basis of simulation results. Full decoupting of rotor flux control and torque control is realised. Dynamics, achievable with a seven-phase vector controlled induction machine, are shown to be essentially identical to those obtainable with a three-phase induction machine.