Magnetic bearings are characterized by a relatively large number of, in the end will know how to reflected bearing:
　　1. support high precision, stable, and reliable.
　　2. under the environment of high temperature, cryogenic and vacuum operation.
　　3. is complex and requires harsh conditions, the environmental magnetic interference, but no other pollution.
　　4. friction small, low power consumption, ultra high-speed operation can be realized.
　　5. Gage-bearing can only be active (active).
　　6. permanent magnet type bearing type can only be a passive (passive), and passive bearing stability can't be in the 3 directions, should at least have 1 direction using Active-type.
　　7. repulsion of magnetic bearings, due to the low magnetic force utilization, structure of suction-type complex, seldom used.
　　8. pure magnetite-bearing can only be 5 degrees of freedom control bearings, the volume, quality and power consumption is relatively large.


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