While it runs, magnets hold the rotor with nothing touching it. Two mechanical backup bearings catch it if something faults.
The full answer
At operating speed it is held entirely by magnets, in all three dimensions, with an air gap all around. Nothing touches it, so there is no friction and no wear. Permanent magnets carry the weight without drawing power, and active magnetic bearings keep it centered.
For fault protection there are two separate mechanical systems behind the magnets: an emergency safety bearing, and a touchdown backup bearing behind that.
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