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| Levitation Control of a Planar Magnetic Bearing Based on Improved ADRC |
| Zhou Zhenxiong1, 2, Qu Yongyin2, 1, Yang Jiandong1, Liu Dejun2 |
| 1. Changchun University of Technology Changchun 130022 China 2. Beihua University Jilin 132013 China |
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Abstract A novel energy-saving variable reluctance-type planar magnetic bearing was designed, which made use of three levitation coils to provide regulation flux to achieve levitation control. The levitation system of the planar magnetic bearing is a complex coupling system in connection with end-levitating altitude and planar position of mover because of the cross-coupling from the magnetic circuit. For the levitation system’s multivariable, nonlinear and strong coupling characters, a novel auto-disturbance rejection controller(ADRC) is proposed to realize decoupling control and disturbance rejection. This controller overcomes the rough character of non-linear function in nonlinear state error feedback of conventional ADRC and improves the control quality. For conventional and the novel ADRC, comparative analysis of simulation for start-up and adding a number of disturbances is carried out. For the improved ADRC, the experimental tests are carried out. The results of simulation and experiment show that the levitation position control system of the Planar Magnetic bearing has better dynamic, static and robust characters by using the novel auto-disturbance rejection controller.
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Received: 21 October 2009
Published: 04 March 2014
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2010, Vol. 25 
