Superconductor technology: apparatus – material – process – High temperature – per se – Having tc greater than or equal to 150 k
Patent
1991-11-14
1993-10-26
Stephan, Steven L.
Superconductor technology: apparatus, material, process
High temperature , per se
Having tc greater than or equal to 150 k
310 905, H02K 709, G11B 555
Patent
active
052566382
ABSTRACT:
A magnetically levitated superconducting bearing includes a magnet (2) mounted on a shaft (12) that is rotatable around an axis of rotation and a Type II superconductor (6) supported on a stator (14) in proximity to the magnet (2). The superconductor (6) is positioned so that when it is cooled to its superconducting state in the presence of a magnetic field, it interacts with the magnet (2) to produce an attractive force that levitates the magnet (2) and supports a load on the shaft (12). The interaction between the superconductor (6) and magnet(2) also produces surface screening currents (8) that generate a repulsive force perpendicular to the load. The bearing also has means for maintaining the superconductor at a temperature below its critical temperature (16, 18). The bearing could also be constructed so the magnet (2) is supported on the stator (14) and the superconductor (6) is mounted on the shaft (12). The bearing can be operated by cooling the superconductor (6) to its superconducting state in the presence of a magnetic field.
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McMichael, "Effects of material processing in high temperature superconducting magnetic bearings", Apl. Phy. Ltr., vol. 59, No. 19, 4 Nov. 1991 pp. 2442-2444.
C. K. McMichael et al., Practical adaption in bulk superconduction magnetic bearing applications, 13 Apr. 1992, pp. 1893-1895.
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"Japanese High on Flywheels," published in Superconductor Industry, Fall 1991 at p. 38; report of magnetically levitated flywheels under development in Japan.
"Magnetic Bearing Model Using Yttrium-Based Superconductor," publication information unknown; report of a prototype magnetic bearing developed Japan.
"Characterization of High-Temperature Superconducting Bearing," by T. Yotsuya et al. publication information unavailable directed to a study of basic properties of a YBa.sub.2 Cu.sub.3 O.sub.x superconducting magnetic bearing.
Magnetic Levitation in a Cylindrical Superconductor, By T. Hasebe et al., published in International Journal of Applied Electromagnetics in Materials Jul. 1991 at pp. 221-225.
Superconducting Actuator Design, By M. Komori et al., published in International Journal of Applied Electromagnetics in Materials, Jul. 1991 at pp. 243-252.
Lynds, Jr. Lahmer
Weinberger Bernard R.
LaBalle C.
Romanik George J.
Stephan Steven L.
United Technologies Corporation
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