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Optimal flux selection for multi three-phase machines in normal and fault conditions

A general method for the optimal flux selection in multiphase induction machines is proposed in this paper. The multiphase machines are configured as multi three-phase units. The proposed algorithm allows computing the optimal flux for the Maximum Torque per Ampere (MTPA) operation in both normal and open-winding fault conditions. The results of the proposed method can be applied to many different types of control schemes, such as Field Oriented Control (FOC), Direct Torque Control (DTC), Direct Flux Vector Control (DFVC), thus assuming a general validity. The proposed method has been tested on a 12-phase asymmetrical induction machine in quadruple three-phase configuration (10kW, 6000rpm). The experimental validation has been carried out using a DFVC control scheme based on the multi-three phase approach.