High Temperature Characterization of a Radial Magnetic Bearing for Turbomachinery Conference Paper uri icon


  • Open loop, experimental force and power measurements of a radial, redundant-axis, magnetic bearing at temperatures to 1000F (538C) and rotor speeds to 15,000 RPM along with theoretical temperature and force models are presented in this paper. The experimentally measured force produced by a single C-core circuit using 22 A was 600 lb. (2.67 kN) at room temperature and 380 lb. (1.69 kN) at 538C. These values were compared with force predictions based on a 1D magnetic circuit analysis and a thermal analysis of gap growth as a function of temperature. The analysis showed that the reduction of force at high temperature is mostly due to an increase in radial gap due to test conditions, rather that to reduced core permeability. Tests under rotating conditions showed that rotor speed has a negligible effect on the bearings static force capacity. One C-core required approximately 340 W of power to generate 190 lb. (845 N) of magnetic force at 538C, however the magnetic air gap was much larger than at room temperature. The data presented is after bearing operation for eleven total hours at 538C and six thermal cycles.

name of conference

  • Volume 4: Turbo Expo 2003

published proceedings

  • Volume 4: Turbo Expo 2003

author list (cited authors)

  • Provenza, A. J., Montague, G. T., Jansen, M. J., Palazzolo, A. B., & Jansen, R. H.

citation count

  • 2

complete list of authors

  • Provenza, Andrew J||Montague, Gerald T||Jansen, Mark J||Palazzolo, Alan B||Jansen, Ralph H

publication date

  • January 2003