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Mathematical Problems in Engineering
Volume 2015, Article ID 316360, 7 pages
Research Article

Unknown Disturbance Estimation for a PMSM with a Hybrid Sliding Mode Observer

1Tongji University, Shanghai 200092, China
2Zhejiang Textile & Fashion College, Ningbo 315211, China
3Wild SC Intelligent Technology CO., LTD, Ningbo 315500, China

Received 7 July 2014; Revised 26 September 2014; Accepted 2 October 2014

Academic Editor: Xudong Zhao

Copyright © 2015 Gang Chen et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A hybrid sliding mode observer that combines high gain feedback and a high-order sliding mode term is developed to identify the time-varying disturbance for a permanent-magnet synchronous motor (PMSM). Based on the measurable current and the position, the unknown disturbance can be identified from the sliding mode term without digital filter effect. It is then used to enhance the robustness of the speed control dynamics. For ease of implementation in real applications, such as DSP and FPGA, the proposed observer is properly designed to avoid complex mathematical operators. Simulation results are given to illustrate the performance of the proposed observer.