Title :
The effect of structural vibrations on magnetic bearing operation
Author :
Zmood, R.B. ; Anand, D.K. ; Kirk, J.A. ; Zivi, E.
Author_Institution :
Dept. of Mech. Eng., Maryland Univ., College Park, MD, USA
Abstract :
The effects of noninfinite casing stiffness are examined for a machine tool magnetic spindle. For simplicity the bearings are assumed to be coupled to the machine frame by flexible supports having negligible damping. In the analysis, the operation of the magnetic bearings is investigated for changes in the support stiffness and the rotor speed. It is concluded that when the magnetic bearings are coupled to the machine frame by flexible supports, additional stable, but lightly damped, whirl frequencies are introduced for the range of spindle speeds and casing stiffnesses considered. It is observed that these frequencies can be damped by using active damping in the bearing control system
Keywords :
damping; machine bearings; machine tools; magnetic devices; vibration control; active damping; bearing control system; machine tool magnetic spindle; magnetic bearing operation; noninfinite casing stiffness; rotor speed; structural vibrations; whirl frequencies; Aerodynamics; Aerospace industry; Control systems; Damping; Electrical equipment industry; Machine tools; Magnetic levitation; Springs; Stators; Vibrations;
Conference_Titel :
Energy Conversion Engineering Conference, 1989. IECEC-89., Proceedings of the 24th Intersociety
Conference_Location :
Washington, DC
DOI :
10.1109/IECEC.1989.74667
