Constant and high switching frequency torque controller for DTC drives

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 synchronizi...

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Bibliographic Details
Main Authors: Toh, C. L., Nik Idris, N. R., Yatim, Abdul Halim Mohamad
Format: Article
Language:English
Published: IEEE 2005
Subjects:
Online Access:http://eprints.utm.my/id/eprint/7306/1/A_H_Yatim_2005_Constant_High_Switching_Frequency_Torque.pdf
http://eprints.utm.my/id/eprint/7306/
http://dx.doi.org/10.1109/LPEL.2005.851316
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Institution: Universiti Teknologi Malaysia
Language: English
Description
Summary: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