7Lang M, Lembke T A. Design of Permanent Magnet Bearings With High stiffness [C]//Tenth International Symposium On Magnetic Bearings, August 2006:45-48.
8Sung T H,Han Y H,Lee J S,et.all. Effect of a Passive Magnetic Damper in a Flywheel System with a Hybrid Superconductor Bearing Set [J]//IEEE Transactions On Applied Superconductivity, 2003,13(2):2165-2168.
9Jean Paul Yonnet. Passive Magnetic Bearings with Permanent Magnets [J]. IEEE Transactions on Magnetics,1978,Mag-14 (5) : 803-805.