Performance of repulsive type magnetic bearing system under nonuniform magnetization of permanent magnet

• Published in: IEEE transactions on magnetics Vol. 36; no. 5; pp. 3696 - 3698
• Main Authors: Ohji, T., Mukhopadhyay, S.C., Iwahara, M., Yamada, S.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: New York, NY IEEE 01.09.2000; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Applied sciences; Bearing; Control systems; Demagnetization; Electromagnets; Electronics; Exact sciences and technology; Magnetic bearings; Magnetic device characterization, design, and modeling; Magnetic devices; Magnetic flux; Magnetic levitation; Magnetism; Magnetization; Nonuniform; Nonuniformity; Permanent magnets; Rotors; Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices; Shafts; Stators; Design; Magnetization; Magnetic bearing; Theoretical study; Permanent magnet; Magnetic device; Magnetic properties
• ISSN: 0018-9464; 1941-0069
• DOI: 10.1109/20.908944

A permanent magnet bearing system utilizes the repulsive forces between the stator and rotor permanent magnets (PM) for the levitation of the system and it results a simplified axial control scheme. A repulsive type magnetic bearing system based on the above principle was fabricated in the authors' laboratory. Material characteristics and the configuration of the permanent magnets are the central component for this type of bearing system. Due to aging or as both the magnets are repelling each other, there will be demagnetization of the permanent magnet, resulting the field distribution along the magnet's periphery nonuniform. In this paper, the effect of this magnetization nonuniformity on the performance of the bearing system has been studied.