Active Magnetic Bearings Stiffness and Damping Identification from Frequency Characteristics of Control System. (10th January 2016)

• Record Type: Journal Article
• Authors: Jin, Chaowu; Xu, Yuanping; Zhou, Jin; Cheng, Changli
• Other Names: Wallaschek Jörg Academic Editor.
• Is Part Of: Shock and vibration. Volume 2016(2016)
• Publication Date: 2016-01-10
• Subjects: Shock (Mechanics) -- Periodicals; Vibration -- Periodicals; 534.5
• DOI: 10.1155/2016/1067506
• Languages: English
• ISSNs: 1070-9622

Abstract

Abstract : At present, the stiffness and damping identification for active magnetic bearings (AMBs) are still in the stage of theoretical analysis. The theoretical analysis indicates that if the mechanical structure and system parameters are determined, AMBs stiffness and damping are only related to frequency characteristic of control system, ignoring operating condition. More importantly, few verification methods are proposed. Considering the shortcomings of the theoretical identification, this paper obtains these coefficients from the experiment by using the magnetic bearing as a sine exciter. The identification results show that AMBs stiffness and damping have a great relationship with the control system and rotating speed. Specifically, at low rotating speed, the stiffness and damping can be obtained from the rotor static suspension by adding the same excitation frequency. However, at high speed, different from the static suspension situation, the AMBs supporting coefficients are not only related to the frequency characteristics of control system, but also related to the system operating conditions.