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New Fuzzy Variable Switching Sector Technique for DTC on Induction Motor Drives  

柳 志 帥 (단국대 전기전자컴퓨터공학부)
洪 淳 瓚 (단국대 전기전자컴퓨터공학부)
李 起 常 (단국대 전기전자컴퓨터공학부)
Publication Information
The Transactions of the Korean Institute of Power Electronics / v.7, no.2, 2002 , pp. 137-148 More about this Journal
Abstract
Direct Torque Control(DTC) is considered to be an useful control scheme of high performance induction motor drives because the scheme provides a quick torque response without requiring the complex field-orientation block and inner current regulation loop. Among a few drawbacks of the conventional DTC scheme, large current harmonics due to flux drooping phenomenon in a low speed range may be the major difficulty In order to remove the difficulty, a fuzzy variable switching sector scheme and its real-time implementation algorithm are proposed in this paper. A DSP based control board is designed for the Induction motor drives with the DTC scheme including the fuzzy switching sector algorithm. Simulation and experimental results show the effectiveness of the proposed scheme.
Keywords
Direct torque control; Induction motor; fuzzy variable switching sector; Current harmonics; Flux drooping.;
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