Design of model-based unbalance compensator with fuzzy gain tuning mechanism for an active magnetic bearing system

• Published in: Expert systems with applications Vol. 38; no. 10; pp. 12861 - 12868
• Main Authors: Tung, Pi-Cheng, Tsai, Mong-Tao, Chen, Kuan-Yu, Fan, Yi-Hua, Chou, Fu-Chu
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 15.09.2011
• Subjects: Active control; Active magnetic bearing; Fuzzy; Fuzzy gain tuning mechanism; Fuzzy logic; Fuzzy set theory; Gain; Model-based integral-type observer; Proportional integral derivative; Tuning; Unbalanced vibration; Vibration; Active magnetic bearing; Fuzzy gain tuning mechanism; Unbalanced vibration; Model-based integral-type observer
• ISSN: 0957-4174; 1873-6793
• DOI: 10.1016/j.eswa.2011.04.078

► An unbalanced force observer is used to estimate disturbances and unbalanced force. ► We design a fuzzy tuner to help a PID controller for control of an AMB system. ► The hybrid controller works well at suppressing unbalanced vibration. ► Experimental results show that the hybrid controller has good performance. This paper deals with the unbalanced vibration problem of a stabilized active magnetic bearing (AMB) system. First, a model-based integral-type observer is proposed to evaluate the shaft displacement and the unbalancing forces of the rotor of an AMB system controlled by a proportional-integral-derivative (PID) controller. A fuzzy gain tuning mechanism is added to adjust the output of the PID controller in order to overcome the disturbances and suppress the unbalancing vibration. We have shown via simulation that the addition of the integral-type force observer improves the rotating accuracy in the device operating range. The experimental results demonstrate an efficient reduction of the shaft displacement of the rotor. Thus, the proposed scheme allows for a remarkable improvement in the unbalanced vibration of an AMB system over conventional PID controls without fuzzy gain tuning mechanism.