An analytical method for designing magnetic bearing controllers with no displacement sensors has been developed and laboratory tested. The method was applied to the design of a sensorless magnetic damper for replacing a rolling element bearing of a vertical rotor with a large unbalance. The synchronous vibration force transmitted to ground was predicted to be reduced by a factor of ten.

Issue Section:
Gas Turbines: Structures and Dynamics
Topics:
Dampers, Design, Control equipment, Displacement, Magnetic bearings, Rolling bearings, Rotors, Sensors, Vibration
1.
Bleuler, H., and Vischer, D., 1991, “Magnetic Bearings With Minimum Hardware Requirement,” presented at ROMAG’91 Magnetic Bearing & Dry Gas Seals Conference, Washington DC, Mar. 13–15.
2.
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3.
Mizuno, T., et al., 1992, “Towards Practical Applications of Self-Sensing Magnetic Bearings,” presented at 3rd International Conference on Active Magnetic Bearings, Alexandria, VA, July 29–31.
4.
Okada, Y., et al., 1992, “Electromagnets as Velocity Sensors and Vibration Control Actuators,” Electromagnetic Forces and Applications, Elsevier Science Publications, pp. 171–174.
5.
Robinson, A. A., 1976, “Magnetically Suspended Momentum Wheel for Satellite Stabilization,” Proc. 2nd Conference on Advanced Magnetic Materials and Applications, Sept., IEE Conference Publication 142, pp. 131–134.
6.
Vischer, D., and Bleuler, H., 1990, “A New Approach to Sensorless and Voltage Controlled AMBs Based on Network Theory Concepts,” Proc. 2nd International Symposium on Magnetic Bearings, July, University of Tokyo.
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 by The American Society of Mechanical Engineers
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