Equivalent Damping Control of Radial Twist Motion for Permanent Magnetic Bearings Based on Radial Position Variation

• Published in: IEEE transactions on industrial electronics (1982) Vol. 62; no. 10; pp. 6417 - 6427
• Main Authors: Liu, Chao, Liu, Gang
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.10.2015; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: active magnetic bearing; Bang-Bang control; control moment gyro; Damping; Design engineering; Equations; Equivalence; Equivalent damping; Finite element analysis; Magnetic bearings; Magnetic levitation; Magnetomechanical effects; Mathematical analysis; Motion stability; permanent magnetic bearing; Rotors; Simulation; Stability analysis; Strategy; Torque; Translations; control moment gyro (CMG); Active magnetic bearing (AMB); permanent magnetic bearing (MB); equivalent damping; bang–bang control
• ISSN: 0278-0046; 1557-9948
• DOI: 10.1109/TIE.2015.2416681

To effectively reject the influence of the low damping property of permanent magnetic bearings and improve the twist motion stability, this paper presents a novel equivalent damping control strategy. First, the relationship between the restoring torque and the radial translation of permanent magnetic rings is pointed out through finite-element analysis. The analysis indicates that the restoring torque increases with the radial translation of the rotor off its origin. Then, the radial translation variation rule is proposed, which can provide equivalent damping for the twist motion. Subsequently, a bang-bang controller is designed enlightened by the variation rule. Moreover, the stability of the bang-bang control is verified using energy consumption arguments, which is similar to the Lyapunov method. Finally, simulation and experimental results are presented to demonstrate the effectiveness of the proposed method.