Abstract
Multiphase (more than three) electric machines and drives were used first to limit current amplitude and later reduce torque ripple with early, six-step converters. More recently, the potential benefits of multiphase drives for electric ship propulsion include improved fault tolerance, improved torque density by harmonic injecting, reduced per-phase power rating, reduced ripple torque, reduced rotor loss, and reduced noise. Since the mid 1990s, R&D effort in the area of multiphase machines and drives has accelerated for new aerospace, electric vehicles, and renewable energy applications, especially off-shore wind because of reliability and size. Among the many multiphase options, N×3-phase systems can be split from existing 3-phase windings and still use conventional 3-phase inverters. This paper provides the analytical synchronous-frame d-q model of the 2×3-phase permanent magnet synchronous machine (PMSM), similar to the conventional three phase d-q model, for the purpose of control development. The developed model is verified with FEA simulation results. This paper also presents how to calculate and scale the parameters of the 2×3-phase PMSM from the baseline 3-phase PMSM. Motor drive engineers seeking the same level of 2×3-phase and 3×3-phase PMSM model as the conventional 3-phase PMSM for control research and development can benefit from this study.
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