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Constant frequency torque and flux controllers for direct torque control of induction machines

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4 Author(s)
N. R. N. Idris ; Electr. Energy Conversion Dept., Universiti Teknologi Malaysia, Skudai, Malaysia ; A. H. M. Yatim ; N. D. Muhamad ; T. C. Ling

This paper proposed a simple solution to the variable switching frequency and high torque ripple problems encountered in hysteresis-based DTC drives. The method replaces the hysteresis-based controllers with fixed switching controllers, which operate based on the comparison between the error signals and the triangular waveforms. Implementation of these controllers using digital circuits is highly suitable since they only require comparisons of waveforms rather than calculations of duty cycles or voltage vectors. Modeling and simulation of the DTC drives using these simple controllers are presented and the results show that they are capable of reducing the torque ripples significantly.

Published in:

Power Electronics Specialist Conference, 2003. PESC '03. 2003 IEEE 34th Annual  (Volume:3 )

Date of Conference:

15-19 June 2003