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|United States Patent||6,118,199|
|Lembke||September 12, 2000|
Device for magnetic suspension of a rotor (10, 20, 30) in relative rotational movement along a predetermined rotation symmetric path with respect to a stator (14, 24, 26, 34, 36). Rotor (10, 20, 30) comprises a rotational body (11, 21, 31) which essentially consists of an electrically conductive unmagnetic material. Fitted at the stator (14, 24, 26, 34, 36) is at least one magnetic member (12, 22, 25, 32, 35), which comprises at least one rotation symmetric magnet (12, 22, 25, 32, 35) concentric with the rotational axis. The magnetic member is disposed to give rise to a rotation symmetric magnetic field concentric with the rotational axis. When and only when the rotational body (11, 21, 31) tends to leave the predetermined path and rotate eccentric, the magnetic field generates induced eddy currents in the rotational body (11, 21, 31), the eddy currents gives rise to restoring stabilising forces.
|Inventors:||Lembke; Torbjorn (Uppsala, SE)|
|Filed:||January 26, 1998|
|Jan 28, 1997 [SE]||9700255|
|Current U.S. Class:||310/90.5|
|Current International Class:||F16C 39/00 (20060101); F16C 39/06 (20060101); H02K 007/09 ()|
|Field of Search:||310/90.5,156|
|3650581||March 1972||Boden et al.|
|3779618||December 1973||Soglia et al.|
|3811740||May 1974||Sacerdoti et al.|
|3903809||September 1975||Miericke et al.|
|3951075||April 1976||Miericke et al.|
|4700094||October 1987||Downer et al.|
"Magnetic Suspension and Propulsion Systems for High-Speed Transportation", P.L. Richards and M. Tinkham, J. Appl. Phys. vol. 43, No. 6, Jun. 1972, pp. 2680-2690..