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Versatile Diagnostic Device for Use with Magnetic Bearings
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English
Abstract
A compact portable device, which permits the measurement and determination of various properties of machinery using magnetic bearings, has been constructed. This mostly analog device has a white noise generator, a variable frequency, variable amplitude sine wave and square wave output and can generate a ramped frequency “rotating” electronic signal to simulate rotor speed run-up. It may be utilized during normal operation or when the rotor is in support, but not rotating. Probably it would be most helpful during initial test-stand testing. System dynamic properties, such as critical speeds, stiffness, damping, maximum and optimum clearances, rub angle locations, amplification factors, log decrements, structure resonances, cross coupling, etc., can be determined. A dynamic balancing feature using open-loop control, with the “rotating” electronic signal synchronized via a key-phasor, may be manually set at a given speed. This balancing feature may be automatically activated and then turned off at previously determined speeds. The open-loop control feature also may be used as a run-out compensator and for foundation vibration reduction. A block diagram description of the operational functions of this diagnostic device is presented, along with experimental results and dynamic properties gathered from its use on several magnetic bearing rigs.
Authors
Citation
Humphris, R., "Versatile Diagnostic Device for Use with Magnetic Bearings," SAE Technical Paper 929046, 1992, https://doi.org/10.4271/929046.Also In
References
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