Impact of inverter switching pattern on the performance of a direct torque controlled synchronous reluctance motor drive

The synchronous reluctance motor has gained more attention recently and is a potential candidate to compete with other ac motors. The simple structure and fast torque response make the direct torque control an attractive solution for the synchronous reluctance motor drive system. Different motor, inverter and controller parameters affect the drive system performance in this method. The drive system performance is investigated for four possible inverter switching patterns in terms of the torque ripple, stator current harmonic content and inverter switching frequency in this paper. The results show that switching pattern in which a zero-voltage vector is applied to decrease the torque, regardless of increment or decrement in the flux, has a better performance in the drive system.

[1]  Giuseppe Buja,et al.  Direct torque control of induction motor drives , 1997, ISIE '97 Proceeding of the IEEE International Symposium on Industrial Electronics.

[2]  L.Q. Zhou,et al.  A direct torque control scheme of ALA synchronous reluctance machine and its DSP-based implementation , 2005, 31st Annual Conference of IEEE Industrial Electronics Society, 2005. IECON 2005..

[3]  M. Pacas,et al.  Predictive Direct Torque Control for a Synchronous Reluctance Machine with Predetermined Stator Flux Compensation Down to Zero Speed , 2007, 2007 IEEE International Electric Machines & Drives Conference.

[4]  Ion Boldea,et al.  Sensorless control of the synchronous reluctance motor , 1993, Conference Record of the 1993 IEEE Industry Applications Conference Twenty-Eighth IAS Annual Meeting.

[5]  Peter Vas,et al.  Sensorless vector and direct torque control , 1998 .

[6]  Tian-Hua Liu,et al.  Adaptive controller design for a synchronous reluctance motor drive system with direct torque control , 2007 .

[7]  Alfredo Vagati,et al.  The synchronous reluctance solution: a new alternative in AC drives , 1994, Proceedings of IECON'94 - 20th Annual Conference of IEEE Industrial Electronics.