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Keywords: magnetic bearings
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Journal Articles
Article Type: Research Papers
J. Eng. Gas Turbines Power. March 2012, 134(3): 032505.
Published Online: January 4, 2012
... a magnetic bearing is the most practical method. In stability analysis, labyrinth seals can produce significant cross coupling forces, which particularly reduce the damping ratio of the first forward mode. Therefore, forward modes should be distinguished from backward modes in the excitation test. One method...
Journal Articles
Article Type: Research Papers
J. Eng. Gas Turbines Power. October 2011, 133(10): 102501.
Published Online: April 25, 2011
...Jerzy T. Sawicki; Dmitry L. Storozhev; John D. Lekki This paper addresses self-diagnostic properties of active magnetic bearing (AMB) supported rotors for online detection of the transverse crack on a rotating shaft. In addition to pure levitation, the rotor supporting bearing also serves...
Journal Articles
Article Type: Research Papers
J. Eng. Gas Turbines Power. July 2011, 133(7): 072503.
Published Online: March 16, 2011
... variety of heat sources including landfill gas, reciprocating engine exhaust, solar, geothermal, boilers, and other industrial processes. The IPM incorporates a high performance, high speed permanent magnet generator with an integrated expansion turbine and low loss magnetic bearings. The IPM operates...
Journal Articles
Article Type: Research Papers
J. Eng. Gas Turbines Power. February 2011, 133(2): 022503.
Published Online: October 28, 2010
... or actuators. In the case reported here, the rotor is supported by active magnetic bearings. The theory underlying the controller is outlined. The objectives include minimization of the forces transmitted to the base while restricting rotor vibrations to a user-defined limit. A third objective is to prevent...
Journal Articles
Article Type: Research Papers
J. Eng. Gas Turbines Power. December 2010, 132(12): 122503.
Published Online: August 27, 2010
...M. Necip Sahinkaya; Abdul-Hadi G. Abulrub; Clifford R. Burrows; Patrick S. Keogh The paper considers three issues in flexible rotor and magnetic bearing systems, namely, the control of rotor vibration, control of transmitted forces, and prevention of rotor contact with auxiliary bearings...
Journal Articles
Article Type: Research Papers
J. Eng. Gas Turbines Power. November 2010, 132(11): 112501.
Published Online: August 5, 2010
... drawbacks. Active magnetic bearings (AMBs) are promising since they are very effective in controlling the vibration of the rotor and offering the possibility of monitoring the rotor’s behavior using their displacement sensors. However they show serious drawbacks related to their stiffness. Electromagnetic...
Journal Articles
Article Type: Research Papers
J. Eng. Gas Turbines Power. May 2010, 132(5): 052502.
Published Online: March 3, 2010
...Iain S. Cade; M. Necip Sahinkaya; Clifford R. Burrows; Patrick S. Keogh To prevent rotor/stator contact in a rotor/magnetic bearing system, auxiliary bearings may be located along the shaft and at the magnetic bearings. Rotor responses after a contact event may include periodic trapped modes where...
Journal Articles
Article Type: Research Papers
J. Eng. Gas Turbines Power. January 2010, 132(1): 012502.
Published Online: September 29, 2009
... speed. In this paper, a novel approach is used to control the journal bearing instability. An active magnetic bearing (AMB) is used to overcome the JB instability and to increase its range of operation. The concept is quite simple: Rather than using the AMB as a load carrying element, the AMB is used...
Journal Articles
Article Type: Research Papers
J. Eng. Gas Turbines Power. March 2009, 131(2): 022507.
Published Online: December 24, 2008
...Iain S. Cade; M. Necip Sahinkaya; Clifford R. Burrows; Patrick S. Keogh Auxiliary bearings are used to prevent rotor/stator contact in active magnetic bearing systems. They are sacrificial components providing a physical limit on the rotor displacement. During rotor/auxiliary bearing contact...
Journal Articles
Article Type: Research Papers
J. Eng. Gas Turbines Power. March 2008, 130(2): 022504.
Published Online: March 3, 2008
...Zachary S. Zutavern; Dara W. Childs A method is presented for parameter identification of an annular gas seal on a flexible-rotor test rig. Dynamic loads are applied by magnetic bearings (MBs) that support the rotor. MB forces are measured using fiber-optic strain gauges that are bonded...
Journal Articles
Article Type: Research Papers
J. Eng. Gas Turbines Power. March 2008, 130(2): 022505.
Published Online: March 3, 2008
... of all the stages and seals are compared to the full-load full-pressure test measured values using a magnetic bearing exciter. A good correlation is obtained between the measured test results and analytical predictions. Solid model of the magnetic bearing exciter Magnetic bearing used...
Journal Articles
Article Type: Technical Papers
J. Eng. Gas Turbines Power. April 2007, 129(2): 522–529.
Published Online: September 14, 2006
...Lawrence Hawkins; Alexei Filatov; Shamim Imani; Darren Prosser A cryogenic gas expander system that incorporates a high-performance, high-speed permanent magnet, direct-drive generator and low loss magnetic bearings is described. Flow loop testing to 30,000 rpm was completed at the system...
Journal Articles
Article Type: Technical Papers
J. Eng. Gas Turbines Power. April 2007, 129(2): 503–510.
Published Online: August 1, 2006
...Klaus Kjølhede; Ilmar F. Santos Parameter identification procedures and model validation are major steps toward intelligent machines supported by active magnetic bearings (AMB). The ability of measuring the electromagnetic bearing forces, or deriving them from measuring the magnetic flux, strongly...
Journal Articles
Article Type: Technical Papers
J. Eng. Gas Turbines Power. April 2007, 129(2): 549–555.
Published Online: July 14, 2006
...Iain S. Cade; Patrick S. Keogh; M. Necip Sahinkaya A novel method for transient rotor/active magnetic bearing control using sampled wavelet coefficients is proposed. Control currents are formulated in the wavelet transform domain, prior to signal reconstruction. The wavelet based controller...
Journal Articles
Article Type: Technical Papers
J. Eng. Gas Turbines Power. April 2005, 127(2): 418–424.
Published Online: April 15, 2005
.... This permits direct assessment of the feasible design problem as well as providing a means to synthesize optimal bearing dynamics. In addition to providing synthesis of magnetic bearings, the resulting bearing transfer functions give direct guidance to selection of more conventional fluid film or rolling...
Journal Articles
Article Type: Technical Papers
J. Eng. Gas Turbines Power. April 2005, 127(2): 437–444.
Published Online: April 15, 2005
...Andrew J. Provenza; Gerald T. Montague; Mark J. Jansen; Alan B. Palazzolo; Ralph H. Jansen Open loop, experimental force and power measurements of a radial, redundant-axis, magnetic bearing at temperatures to 1000°F (538°C) and rotor speeds to 15,000 rpm along with theoretical temperature and force...
Journal Articles
Article Type: Technical Papers
J. Eng. Gas Turbines Power. April 2004, 126(2): 366–372.
Published Online: June 7, 2004
...P. S. Keogh; M. O. T. Cole; M. N. Sahinkaya; C. R. Burrows During the normal operation of rotor/magnetic bearing systems, contacts with auxiliary bearings or bushes are avoided. However, auxiliary bearings are required under abnormal conditions and in malfunction situations to prevent contact...
Journal Articles
Article Type: Technical Papers
J. Eng. Gas Turbines Power. April 2004, 126(2): 373–384.
Published Online: June 7, 2004
...A. Escalante; V. Guzma´n; M. Parada; L. Medina; S. E. Diaz The use of magnetic bearings in high speed/low friction applications is increasing in industry. Magnetic bearings are sophisticated electromechanical systems, and modeling magnetic bearings using standard techniques is complex and time...
Journal Articles
Article Type: Technical Papers
J. Eng. Gas Turbines Power. January 2004, 126(1): 142–146.
Published Online: March 2, 2004
...A. Kenny; A. Palazzolo; G. T. Montague; A. F. Kascak The effect of the laminate stacking factor on homopolar magnetic bearing performance is examined. Stacked laminates are used on the bearing rotor and in the stator. These laminate stacks have anisotropic permeability. Equations for the effect...
Journal Articles
Article Type: Technical Papers
J. Eng. Gas Turbines Power. April 2006, 128(2): 362–369.
Published Online: March 1, 2004
...P. S. Keogh; M. O. T. Cole This paper investigates the vibration characteristics of rotor displacement signals in a magnetic bearing system under conditions when rotor contact with auxiliary bearings is possible. Since these signals may be used for feedback control, it is necessary to determine how...