Definitions for magnetic bearing
This page provides all possible meanings and translations of the word magnetic bearing
Bearing relative to the nearest magnetic pole.
A magnetic bearing is a bearing that supports a load using magnetic levitation. Magnetic bearings support moving parts without physical contact. For instance, they are able to levitate a rotating shaft and permit relative motion with very low friction and no mechanical wear. Magnetic bearings support the highest speeds of all kinds of bearing and have no known maximum relative speed. Passive magnetic bearings use permanent magnets and, therefore, do not require any input power but are difficult to design due to the limitations described by Earnshaw's theorem. Techniques using diamagnetic materials are relatively undeveloped and strongly depend on material characteristics. As a result, most magnetic bearings are active magnetic bearings, using electromagnets which require continuous power input and an active control system to hold the load stable. In a combined design, permanent magnets are often used to carry the static load and the AMB is used when the levitated object deviates from its optimum position. Magnetic bearings typically require a back-up bearing in the case of power or control system failure. Magnetic bearings are used in several industrial applications such as electrical power generation, petroleum refinement, machine tool operation and natural gas handling. They are also used in the Zippe-type centrifuge used for uranium enrichment. Magnetic bearings are used in turbomolecular pumps, where oil-lubricated bearings would be a source of contamination.
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"magnetic bearing." Definitions.net. STANDS4 LLC, 2014. Web. 15 Mar. 2014. <http://www.definitions.net/definition/magnetic bearing>.