Constant Switching Frequency Based Direct Torque Control of Interior Permanent Magnet Synchronous Motors with Reduced Ripples and Fast Torque Dynamics

Gilbert Hock Beng Foo, Xinan Zhang

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

The conventional direct torque control (DTC) features control structure simplicity, fast dynamic response, and parameter robustness. Nevertheless, it suffers from the problems of variable switching frequency and large torque ripples. This paper presents a modified DTC algorithm for interior permanent magnet synchronous motor drives with fast torque dynamics and constant switching frequency. The aforementioned problems are alleviated by adding a PI torque regulator to autonomously alter the effective duty cycle of the applied voltage vector. As a result, a constant switching frequency and also reduced torque ripples are obtained while retaining the benefits of the classical DTC. In addition, the torque dynamic response is further improved by introducing a modified switching table during transient conditions. By incorporating the modified switching table, the torque dynamic response is superior to that of the classical DTC. Simulation and experiment results included confirm the effectiveness of the proposed method.

Original languageEnglish
Article number7336548
Pages (from-to)6485-6493
Number of pages9
JournalIEEE Transactions on Power Electronics
Volume31
Issue number9
DOIs
Publication statusPublished - 1 Sep 2016
Externally publishedYes

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