Due to recent advances in rare-earth technologies, application of permanent magnets has gained a new interest. As bearing elements, permanent magnets offer important advantages, such as the noticeable reduction of friction losses and the capability of achieving high speeds. A tapered geometry is investigated by means of finite element analysis and by a purpose-developed software based on magnetostatic integral equations. On the basis of the equivalent currents method, some basic relations have also been obtained that permit to study the influence of the magnetization angles, once four 'geometry' vectors are known. The present study may be used as a starting point for an optimization procedure on the shape and magnetization directions of permanent magnet bearings.
Unable to display preview. Download preview PDF.
- 1.Yonnet, J.P., 'Passive magnetic bearings with permanent magnets', IEEE Trans. Magn. 14 (1978) 803-805.Google Scholar
- 2.Yonnet, J.P., 'Permanent magnet bearings and couplings', IEEE Trans. Magn. 17 (1981) 1169-1173.Google Scholar
- 3.Okuda, H. et al., 'Characteristics of ring permanent magnet bearing', IEEE Trans. Magn. 20(1) (1984) 1693-1695.Google Scholar
- 4.Bassani, R. and Villani, S., 'Axially magnetized passive radial magnetic bearings', Appl. Mech. Engng 1 (1995) 77-96.Google Scholar
- 5.Dellinger, S.J. and Strnat, K.J., 'Field and force calculations for use in passive magnetic bearing systems employing rare-earth magnets', In: Proceedings of the 8th International Workshop on Rare-Earth Magnets and their Applications, Dayton-Ohio, 1985, pp. 153-164.Google Scholar
- 6.Nagaraj, H.S., 'Investigation of magnetic fields and forces arising in open-circuit-type magnetic bearings', Trib. Trans. 31(2) (1986) 192-201.Google Scholar
- 7.Earnshaw, S., 'On the nature of molecular forces which regulate the constitution of luminoferous ether', Trans. Comb. Phil. Soc. 7 (1842) 97-112.Google Scholar
- 8.Bassani, R., Stabilità di Corpi in Campi Potenziali, Dip. Costr. Mecc. Nucl., Pisa, RL 524(91), 1991.Google Scholar
- 9.Yonnet, J.P. et al., 'Stacked structures of passive magnetic bearings', J. Appl. Phys. 70(10) (1991) 6633-6635.Google Scholar
- 10.Bassani, R. and Villani, S., 'Passive magnetic bearings: the conic-shaped bearing', Proc. Inst. Mech. Eng. 213 Part J (1999) 151-161.Google Scholar
- 11.Smythe, W.R., Static and Dynamic Electricity, McGraw-Hill, New York, 1950.Google Scholar
- 12.Ansys User's Manual for Revision 5.1, Vol. IV, 'Theory'.Google Scholar
- 13.Ren, Z., 'Comparison of different force calculation methods in 3D finite element modeling', IEEE Trans. Magn. 3 (1994) 3471-3474.Google Scholar
- 14.Coey, J.M.D., Rare-Earth Iron Permanent Magnets, Clarendon Press, Oxford, 1996.Google Scholar