Constant and high switching frequency torque controller for DTC drives

Chuen Ling Toh, N. R.N. Idris, A. H.M. Yatim

Research output: Contribution to journalArticle

46 Citations (Scopus)


The letter presents a new method of increasing the switching frequency of a direct torque control (DTC) of induction machines. The method simply replaces the hysteresis comparator of the conventional DTC drives with a triangular waveform-based constant switching frequency controller. By synchronizing the digital signal processor (DSP) sampling with a triangular waveform and with an appropriate systematic controller design, a high switching frequency DTC drive is possible without requiring a high-frequency space-vector modulator. The implementation of the controller is simple and operates based on waveform comparisons; in this letter it is implemented using a combination of a DSP and a field programmable gate array device. Simulation and experimental results indicate that the controller both reduces the torque ripple and maintains a constant switching frequency.

Original languageEnglish
Pages (from-to)76-80
Number of pages5
JournalIEEE Power Electronics Letters
Issue number2
Publication statusPublished - 01 Jun 2005

All Science Journal Classification (ASJC) codes

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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