Preliminary study results on Nd-Fe-B material magnet properties as applied to using the magnets in centrifuges

The parameters of Nd-Fe-B alloy magnets are studied to determine the possibility of their application in rotor magnetic suspension supports of new generation centrifuges. Measurements are performed for a lifting force and a lateral rigidity of the magnetic suspension support, values of magnetic induction for both poles at a distance of 2 mm from side surfaces, a value of a magnetic field axis shift from an axis of symmetry of the magnet for various types of magnet mounting. The measurement results shown that magnetic induction at the N pole is higher by 20% compared to the S pole; a spread of magnetic induction at the S pole equals 10% (instead of a permissible value of 5%); a magnetic axis shift constitutes 0.18-0.30 mm ( a permissible value is 0.1 mm). A conclusion is drawn that the use of Nd-Fe-B alloy magnets permits a considerable decrease of magnetic suspension support dimensions, but calls for design optimization and a consideration of mechanical and corrosion properties of a Nd-Fe-B alloy