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

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3 Author(s)
P. Wipasuramonton ; Dept. of Electron. & Electr. Eng., Univ. of Sheffield, UK ; Zi Qiang Zhu ; D. Howe

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.

Published in:

IEEE Transactions on Power Electronics  (Volume:20 ,  Issue: 2 )