Direct torque control of induction machines with constant switching frequency and reduced torque ripple
Idris, N.R.N.
Yatim, A.H.M.
Dept. of Energy Conversion, Univ. Teknologi Malaysia, Johor, Malaysia;
This paper appears in: Industrial Electronics, IEEE Transactions on
Publication Date: Aug. 2004
Volume: 51,
Issue: 4
On page(s): 758- 767
ISSN: 0278-0046
INSPEC Accession Number: 8110774
Digital Object Identifier: 10.1109/TIE.2004.831718
Current Version Published: 2004-08-02
Abstract
Direct torque control (DTC) of induction machines is known to have a simple control structure with comparable performance to that of the field-oriented control technique. Two major problems that are usually associated with DTC drives are: switching frequency that varies with operating conditions and high torque ripple. To solve these problems, and at the same time retain the simple control structure of DTC, a constant switching frequency torque controller is proposed to replace the conventional hysteresis-based controller. In this paper, the modeling, averaging, and linearization of the torque loop containing the proposed controller followed by simulation and experimental results are presented. The proposed controller is shown to be capable of reducing the torque ripple and maintaining a constant switching frequency.
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