On the performance of hybrid foil-magnetic bearings
Abstract
Recent technological advancements make hybridization of the magnetic and foil bearing both possible and extremely attractive. Operation of the foil/magnetic bearings takes advantage of the strengths of each individual bearing while minimizing each others weaknesses. In this paper one possible hybrid foil and magnetic bearing arrangement is investigated and sample design and operating parameters are presented. One of the weaknesses of the foil bearings, like any hydrodynamic bearing, is that contact between the foil bearing and the shaft occurs at rest or at very low speeds and it has low load carrying capacity at low speed. For high speed applications, AMBs are, however, vulnerable to rotor-bending or structural resonances that can easily saturate power amplifiers and make the control system unstable. Since the foil bearing is advantageous for high speed operation with a higher load carrying capacity, and the magnetic bearing is so in low speed range, it is a natural evolution to combine them into a hybrid bearing system thus utilizing the advantages of both. To take full advantage of the foil and magnetic elements comprising a hybrid bearing, it is imperative that the static and dynamic characteristics of each bearing be understood. This paper describes the development ofmore »
- Authors:
- Publication Date:
- Research Org.:
- Mohawk Innovative Technology, Inc., Albany, NY (US)
- OSTI Identifier:
- 20015447
- Resource Type:
- Journal Article
- Journal Name:
- Journal of Engineering for Gas Turbines and Power
- Additional Journal Information:
- Journal Volume: 122; Journal Issue: 1; Conference: International Gas Turbine and Aeroengine Congress and Exhibition, Stockholm (SE), 06/02/1998--06/05/1998; Other Information: PBD: Jan 2000; Journal ID: ISSN 0742-4795
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; MAGNETIC BEARINGS; PERFORMANCE; HYBRID SYSTEMS; DESIGN; GAS BEARINGS; JOURNAL BEARINGS; PARAMETRIC ANALYSIS
Citation Formats
Heshmat, H, Chen, H M, and Walton, II, J F. On the performance of hybrid foil-magnetic bearings. United States: N. p., 2000.
Web. doi:10.1115/1.483178.
Heshmat, H, Chen, H M, & Walton, II, J F. On the performance of hybrid foil-magnetic bearings. United States. https://doi.org/10.1115/1.483178
Heshmat, H, Chen, H M, and Walton, II, J F. 2000.
"On the performance of hybrid foil-magnetic bearings". United States. https://doi.org/10.1115/1.483178.
@article{osti_20015447,
title = {On the performance of hybrid foil-magnetic bearings},
author = {Heshmat, H and Chen, H M and Walton, II, J F},
abstractNote = {Recent technological advancements make hybridization of the magnetic and foil bearing both possible and extremely attractive. Operation of the foil/magnetic bearings takes advantage of the strengths of each individual bearing while minimizing each others weaknesses. In this paper one possible hybrid foil and magnetic bearing arrangement is investigated and sample design and operating parameters are presented. One of the weaknesses of the foil bearings, like any hydrodynamic bearing, is that contact between the foil bearing and the shaft occurs at rest or at very low speeds and it has low load carrying capacity at low speed. For high speed applications, AMBs are, however, vulnerable to rotor-bending or structural resonances that can easily saturate power amplifiers and make the control system unstable. Since the foil bearing is advantageous for high speed operation with a higher load carrying capacity, and the magnetic bearing is so in low speed range, it is a natural evolution to combine them into a hybrid bearing system thus utilizing the advantages of both. To take full advantage of the foil and magnetic elements comprising a hybrid bearing, it is imperative that the static and dynamic characteristics of each bearing be understood. This paper describes the development of a new analysis technique that was used to evaluate the performance of a class of gas-lubricated journal bearing. Unlike conventional approaches, the solution of the governing hydrodynamic equations dealing with compressible fluid is coupled with the structural resiliency of the bearing surface. The distribution of the fluid film thickness and pressures, as well as the shear stresses in a finite-width journal bearing, are computed. Using the Finite Element (FE) method, the membrane effect of an elastic top foil was evaluated and included in the overall analytical procedure. Influence coefficients were generated to address the elasticity effects of combined top foil and elastic foundation on the hydrodynamics of journal bearings, and were used to expedite the numerical solution. The overall program logic proved to be an efficient technique to deal with the complex structural compliance of various foil bearings. Parametric analysis was conducted to establish tabulated data for use in a hybrid foil/magnetic bearing design analysis. A load sharing control algorithm between the foil and magnetic elements is also discussed.},
doi = {10.1115/1.483178},
url = {https://www.osti.gov/biblio/20015447},
journal = {Journal of Engineering for Gas Turbines and Power},
issn = {0742-4795},
number = 1,
volume = 122,
place = {United States},
year = {Sat Jan 01 00:00:00 EST 2000},
month = {Sat Jan 01 00:00:00 EST 2000}
}