Improvement of the Force Relaxation in HTSC Magnetic Bearing

• Published in: Transactions of the Japan Society of Mechanical Engineers Series C Vol. 64; no. 618; pp. 495 - 501
• Main Authors: LUO, Yun, YOSHIDA, Yoshikatsu, MIYA, Kenzo, HIGASA, Hiromasa
• Format: Journal Article
• Language: Japanese
• Published: The Japan Society of Mechanical Engineers 1998
• Subjects: Flux Creep; HTSC Magnetic Bearing; Hysteresis Hardening Effect; Levitation Force Relaxation; Numerical Evaluation; Radial-type
• ISSN: 0387-5024; 1884-8354
• DOI: 10.1299/kikaic.64.495

In the present study, we described a method for improving the influence of flux creep on the levitation property in HTSC magnetic bearing. The scenario of this method is to induce reverse flow shielding currents in two regions of the HTSC bulks through varying the distance between the permanent magnets and the HTSC bulks. The magnetic forces produced in both these regions also take opposite directions. In this case, the difference between the two forces will give the net magnetic force in the HTSC magnetic bearing. Obviously, the actual force decay observed in the HTSC magnetic bearing is determined by the difference between the force decay in these two regions, therefore being resultantly reduced. This phenomenon can be called as 'Hysteresis Hardening Effect'. For the evaluation of the mentioned approach, numerical simulations were carried out with the configuration of a practical radial-type HTSC magnetic bearing. The numerical results show the validity of the present method. Also some discussions were added with concerning of its practical application.