Control of electric actuator using Brushless DC Motor (BLDC) is designed. The BLDC motor is preferred for electric actuator because of its excellent reliability and efficiency. A new kind of Slide mode variable structure controller namely Exponent Trending algorithm is used for the BLDC electric actuator. The Trending law algorithm is used as it reduces the chattering and improves system‟s performance. The mathematical model of BLDC electric actuator is derived and the theoretical equation of exponential trending law algorithm is taken. The performance characteristics of the controller and the position angle of BLDC electric actuator are obtained.

1. Chung.S.K, Lee.J.H, KO.J.S, Youn.M.J, “Robust speed control of brushless direct-drive motor using integral variable structure control”, IEEE Proceedings Electronics Power Applications., vol.142, no.6, pp.361-370, November, 1995.
2. Edrey D.Ruiz-Rojas, J.L.Vazquez-Gonzalez1, Rube Alejos-Palomares, Apolo Z. Escudero-Uribe, J. Rafael Mendoza-Vázquez, “Mathematical Model of a Linear Electric Actuator with Prosthesis Applications”, IEEE conference on Electronics, Communication and Computers, page182-186,2007
3. Feng Lv, Hai-Lian Du, Jun-Hua Yang, Zhan-Feng Wang, “The Electric Actuator‟s Fault Diagnosis Based On Information Fusion, IEEE Proceedings of the Sixth International Conference on Machine Learning and Cybernetics, Hong Kong, 19-22 August 2007.
4. Hailong Song, Yong Yu and Dianguo Xu, “A novel SMC-fuzzy speed controller for permanent magnet Brushless DC motor,” Power Electronics Conference and Exposition, vol.1, pp.281-285, February, 2003.
5. Jessen Chen and Pei-Chong Tang, “A sliding mode current control scheme for PWM Brushless DC motor drives,” IEEE Proceedings in Electrical Power Application, vol.14, no.3, pp.541-551, May, 1999.
6. Jian-Bo cao and Bing-Gang Cao, “Fuzzy-Logic-Based Sliding-Mode controller design for position-sensor less Electric vehicles”, IEEE Transaction on power electronics, vol.24, No.10, October 2009.
7. Jianwei cheng, Xiaoxian Yao, “Control of Electric Actuators using BLDC motor and its performance evaluation”, IEEE Intelligent computation technology and automation, 2009.
8. Kadjoudj.K, Abdessmed.R, Golea.N, and Benbouzid.M.E “Adaptive fuzzy Logic control for high performance PM synchronous drives,” Electrical Power Components and Systems, vol.29, no.9, pp789-807, September, 2001.
9. Michel Cotsaftis, “Natural decoupling of electric actuator equations”, IEEE 1996.
10. Nagrath.M and Gopal I.J. “Control system of engineering”, Second edition, Wisely publications.
11. Raymond A.Decarlo, Stanislaw H.Zak, “Variable Structure Control of Nonlinear multivariable Systems: A Tutorial”, Proceedings of the IEEE, Vol. 76, no. 3, March 1988
12. Tan Y.K. and Panda S.K., “Sliding-mode position controller for linear permanent magnet brushless DC servo motors,” Power Electronics and Drive Systems, vol.2, pp.1653-1658, Nov,2003
13. Vadim I. Utkin, “Sliding Mode Control Design Principles and Applications to Electric Drives”, IEEE transactions on Industrial electronics, vol. 40, no. 1, February 1993.
14. Yongxiang Xu, Yu Tang, Junwei Zhu, Jibin Zou, “Control Of a BLDC Motor for Electromechanical Actuator”
15. Young-Cheol Leel, “Position control of BLDC Motor actuator using time delay control and enhanced time delay observer”.

BLDC Electric Actuator Sliding mode controller