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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 decoupling 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.
Date of Conference: 15-17 Dec. 2006