I found some info on magnetic bearings.
Quote:
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Originally Posted by SFK
The fact that a rotor spins in space without contact with the stator means drag on the rotor is minimal. That opens up the opportunity for the bearing to run at exceptionally high speeds, where the only limitation becomes the yield strength of the rotor material.
At Revolve, magnetic bearings have been designed with surface speeds up to 250 m/s or 4.5 million DN, where DN is the diameter of the rotor (mm) times the rotational spend (rpm). In order to achieve one quarter of this kind of speed with conventional bearings, a complex lubrication system is required.
No other type of bearing, can match magnetic bearings for shear speed.
Magnetic bearings open new possibilities for extreme high-speed applications such as machine tool spindles and turbo compressors.
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if in corporated into turbos, spool time could be reduced and oil lines a thing of the past!!