Three dimensional vibration of the HTSC-permanent magnet bearing system inthe mechanical resonant state

The three dimensional vibration of the rotor in a HTSC-permanent magnet bea ring system is studied. We have developed the bearing system which can revo lve up to 12,000 rpm, and the three dimensional vibration of the rotor is m easured with laser displacement sensors. The shape of the rotor has been im proved, and influence of the air resistance: becomes small, The vibration o f the rotor around the mechanical resonance frequency is investigated. Both columnar and conical behavior of the rotor are confirmed and mainly column ar motion is observed.