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Apparatus and method for magnetically unloading a rotor bearing

United States Patent

9,892,839
February 13, 2018
View the Complete Patent at the US Patent & Trademark Office
An apparatus and method for unloading a rotor bearing is described. The apparatus includes an electromagnet for levitating the rotor. In one embodiment, a sensor of the magnetic field near the electromagnet is used to control the current to levitate the rotor. In another embodiment, a method is provided that includes rotating the rotor, increasing the current to levitate the rotor and decrease the gap between electromagnet and rotor, and then reducing the current to levitate the rotor with a minimal amount of electric power to the electromagnet.
Sanders; Seth Robert (Berkeley, CA)
Amber Kinetics, Inc. (Union City, CA)
13/ 973,937
20140055905
August 22, 2013
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT This invention was made with government support under DE-FOA-0000036 awarded by the U.S. Department of Energy. The government has certain rights in the invention.