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Improved current-regulated delta modulator for reducing switching frequency and low-frequency current error in permanent magnet brushless AC drives

Wipasuramonton, P., Zhu, Z.Q. and Howe, D. (2005) Improved current-regulated delta modulator for reducing switching frequency and low-frequency current error in permanent magnet brushless AC drives. IEEE Transactions on Power Electronics, 20 (2). pp. 475-484. ISSN 0885-8993

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Abstract

The conventional current-regulated delta modulator (CRDM) results in a high current ripple and a high switching frequency at low rotational speeds, and in low-frequency current harmonics, including a fundamental current error, at high rotational speeds. An improved current controller based on CRDM is proposed which introduces a zero-vector zone and a current error correction technique. It reduces the current ripple and switching frequency at low speeds, without the need to detect the back-emf, as well as the low-frequency error at high speeds. The performance of the modulator is verified by both simulation and measurements on a permanent magnet brushless ac drive.

Item Type: Article
Copyright, Publisher and Additional Information: Copyright © 2005 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Keywords: brushless ac drive, current control, modulation, pulse width modulation
Academic Units: The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Electronic and Electrical Engineering (Sheffield)
Depositing User: Sherpa Assistant
Date Deposited: 12 Dec 2005
Last Modified: 08 Feb 2013 16:48
Published Version: http://dx.doi.org/10.1109/TPEL.2004.842957
Status: Published
Refereed: Yes
Identification Number: 10.1109/TPEL.2004.842957
URI: http://eprints.whiterose.ac.uk/id/eprint/864

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