Efficiency of magnetohydrodynamic bearing

I. E. Tarapov

Abstract
Basic schemes for radial MHD bearings are analyzed from the viewpoint of their efficiency, i.e., the expenditure of total energy supplied to the bearing per unit lift force. Small gap and Reynolds number are assumed (δ/R << 1, ωδ² /ν << 1). It is shown that MHD bearings are more efficient than bearings with neutral lubrication. A bearing with insulators (the surfaces of the pivot and roller are perfectly nonconducting) has an advantage over a system with conductors (the surfaces are perfectly conducting). Results are presented of calculations for an MHD bearing of finite length with insulators and a radial external magnetic field. An insulating bearing scheme in a uniform magnetic field is examined; the most favorable orientation of this field relative to the load is found.