Modified Direct Torque Control of Permanent Magnet Synchronous Motor by using voltage vectors of variable amplitude and angle
Ragi R Menon1, S. Jebarani Evangeline2, Anish Gopinath3
1Ragi R Menon, Electrical & Electronics Engg, Karunya University, Coimbatore, India.
 2S. Jeberani Evangeline, Electrical & Electronics Dept, Karunya University, Coimbatore, India.
3Anish Gopinath, CECD/AVN, VSSC, Trivandrum, India.
Manuscript received on November 20, 2012. | Revised Manuscript received on December 01, 2012. | Manuscript published on December 30, 2012. | PP: 283-289 | Volume-2, Issue-2, December 2012.  | Retrieval Number: B0931112212 /2012©BEIESP

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Abstract: In conventional direct torque controlled (DTC) permanent magnet synchronous motor drive (PMSM), there is usually unwanted torque and flux ripple. A modified direct torque control (DTC) for permanent-magnet synchronous machines, which enables important torque- ripple reduction by using voltage vectors with variable amplitude and angle, is proposed in this paper. In the proposed DTC, the magnitude of torque and flux errors are differentiated and employed to regulate the amplitude and angle of the output voltage vectors, which are finally synthesized by space vector modulation (SVM). The proposed DTC method is comparatively investigated with conventional DTC based on theory analysis and computer simulation. Simulations results validate the effectiveness of the proposed schemes in this paper. 
Keywords: Direct Torque Control(DTC), Maximum torque per ampere(MTPA), Permanent Magnet Synchronous Motor (PMSM),Space Vector Modulation(SVM).