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Mathematical Problems in Engineering
Volume 2014, Article ID 568986, 8 pages
Research Article

Online Identification Methods of Load Rotary Inertia and Torque in Radar Servo System

1School of Energy Science and Engineering, University of Electronic Science and Technology of China, Sichuan 611731, China
2School of Electrical and Information Engineering, Xihua University, Sichuan 610039, China
3Dongfang Electric Corporation DEC R&D Centre, Sichuan 611731, China

Received 27 September 2014; Revised 9 December 2014; Accepted 10 December 2014; Published 31 December 2014

Academic Editor: Xinkai Chen

Copyright © 2014 Yong 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.


In radar servo system, the load is usually subject to movement and gust, which may cause instability of the system. In this paper, the online identification methods of load rotary inertia and torque in radar servo system are proposed, respectively. The radar servo system is based on synchronous motor. The load rotary inertia of the system is identified online by a disturbance observer. Moreover, a reduced order Luenberger observer is designed to observe the variation of the load torque and velocity online. The simulation models are established to verify the proposed disturbance observer for the load rotary inertia and the reduced order Luenberger observer for the load torque and velocity.