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Efficient Speed and Torque Control of Permanent Magnet Synchronous Motor Using Hexagram Inverter

Sunil Kumar Megavath, G.Laxminarayana

Synchronous motor drives are suitable for constant speed applications as its speed of operation depends only on the frequency of the stator supply. Synchronous motor with permanent magnet is a choice in KW range applications and preferred over conventional motors like Induction and Synchronous motors due its superior performance, efficiency and controllability. Normal voltage source inverters are suitable only for three phase drives. Multi-level inverters provide near sinusoidal voltages and hence better power quality which is acceptable. The Hexagram inverter has the advantages of both these inverters, while, it also drives six-phase motors which are more popularly used now. This paper deals with Hexagram inverter fed PMSM drive. Vector control scheme has been employed due to its benefits like better dynamic response. The PMSM has been modelled in d q frame and the drive system is simulated using MATLAB / Simulink. The results of the hexagram inverter and the drive structure are presented for various operating conditions. The model delivers promising results due to the multilevel property of the hexagram inverter and the vector control method.