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Abstract

Designing Magnetic Bearings

• Magnetic bearings are used to levitate flywheels so they can spin at high speeds without mechanical contact.
• The design of a bearing set to control a flywheel weighing 5100 lbs and spinning at 15,000 revolutions per minute was described in the paper, “Permanent Magnet Bias, Homopolar Magnetic Bearings for a 130 kW-hr Composite Flywheel,” by B. Murphy, H. Ouroua, M. Caprio, and J.Herbst.
• The paper was presented at the Ninth International Symposium on Magnetic Bearings. Among the interesting results presented include the connection among the hysteresis in the lamination material used in the bearings, torque on the rotor, and losses in the operation as well as
the division of the vertical thrusts between elastomeric mechanical mounts and a magnetic thrust bearing.