Single Phase Commutation Control of Open-End Winding PMSM Fed by Single DC-Link Dual Inverter

This paper proposes a single phase commutation control method of open-end winding permanent magnet synchronous machine operated by a single DC-link dual inverter. For the control of open-end winding PMSM, a per-phase current control method which independently controls each phase is adopted. The proposed method allows the open-end winding PMSM to maintain the output torque while the only single phase of three phase windings conducts. In order to maintain the constant output torque with single phase commutation, modification of current reference is introduced. When a single phase is commutating, the other two phases do not conduct nor does the switching happen. The switching loss is significantly minimized with a small increase of conduction loss resulting in the improvment of overall drive system efficiency. The validity of the proposed control method was verified with simulation result.