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Mathematical Problems in Engineering
Volume 2015, Article ID 879581, 11 pages
Research Article

Practical Modeling and Comprehensive System Identification of a BLDC Motor

Vehicle Research Center, School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China

Received 11 December 2014; Accepted 6 March 2015

Academic Editor: Alfonso Banos

Copyright © 2015 Changle Xiang 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.


The aim of this paper is to outline all the steps in a rigorous and simple procedure for system identification of BLDC motor. A practical mathematical model for identification is derived. Frequency domain identification techniques and time domain estimation method are combined to obtain the unknown parameters. The methods in time domain are founded on the least squares approximation method and a disturbance observer. Only the availability of experimental data for rotor speed and armature current are required for identification. The proposed identification method is systematically investigated, and the final identified model is validated by experimental results performed on a typical BLDC motor in UAV.