A New Sliding-Mode Observer for Sensorless Control of Permanent Magnet Synchronous Motor

Abstract:

In this paper, a new sliding-mode observer (SMO) for sensorless control of permanent magnet synchronous motor (PMSM) is proposed. The observer is built based on the study of the back electromotive force (EMF) equivalent control. The new SMO, which substitues a hyperbolic tangent function for the signum function with a variable boundary layer, can reduce the chattering phenomenon. In order to overcome the time delay, we cancelled the low-pass filter and phase compensation module. In this way, not only the structure of the observer is simplified, but also the estimation precision is improved. The simulation results prove that the new SMO has a good dynamic performance and static quality.

• Periodical: Applied Mechanics and Materials (Volume 740)
• Pages: 317-320
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.740.317
• Online since: March 2015
• Authors: Tong Yi Han, Zhong Hua Wang, Fei Fei Han*
• Keywords: Back Electromotive Force (EMF), Permanent Magnet Synchronous Motor (PMSM), Sensorless Control, Sliding-Mode Observer (SMO)

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