Investigation of Decoupled PWM Strategy for a Three-Phase Open-End Winding Permanent Magnet Synchronous Motor Using a Five-Leg Inverter

Dual-inverter drive of open-end winding ac machine is equivalent to the conventional three-level inverter system from the point of view of voltage vector count, but is simpler in the structure. Decoupled PWM strategy is usually used in the dual- inverter drive. In this paper, it is proposed that a three-phase open-end winding permanent magnet synchronous motor (PMSM) is driven with a five-leg inverter so as to simplify the power electronic circuit and to reduce the hardware cost, whilst the decoupled PWM strategy is evolved accordingly. Simulation and experiments show that the evolved drive system can achieve a similar control performance to the traditional system.