Comparison and optimization of lift and drag forces on vehicles levitated by eddy current repulsion for various null and normal flux magnets with one or two tracks

Conference · Sat Mar 01 00:00:00 EDT 1975 · IEEE Trans. Magn., v. MAG-11, no. 2, pp. 604-607

OSTI ID:4094792

Hogan, J R; Fink, H J

Lift and drag forces are compared for various null and normal flux superconducting magnet configurations, where each coil consists of a pair of infinitely long parallel wires separated by a fixed distance. The null-flux configuration has a minimum in the drag to lift ratio for a particular value of I$sup 2$/W (I = magnet current, W = vehicle weight) when the vehicle cruises freely at constant speed. This calculation takes into account losses due to non- uniform eddy-current density distribution in the solid track. Results indicate that the null-flux configuration is the most efficient design, followed by the normal-flux, single track configuration. All other schemes are less efficient for a thin track configuration. A general method is outlined for calculating the zero-torque case. (auth)

• Research Organization: Univ. of California, Davis
• NSA Number: NSA-33-017061
• OSTI ID: 4094792
• Journal Information: IEEE Trans. Magn., v. MAG-11, no. 2, pp. 604-607, Conference: Applied superconductivity conference, Oakbrook, Illinois, USA, 30 Sep 1974; Other Information: See CONF-740957--. Orig. Receipt Date: 30-JUN-76
• Country of Publication: United States
• Language: English

Related Subjects

N42220* -Engineering-Facilities & Equipment-Cryogenic & Superconducting Equipment & Devices
330300* -Advanced Automotive Propulsion Systems-Electric- Powered Systems
*LEVITATED TRAINS- SUPERCONDUCTING MAGNETS
*SUPERCONDUCTING MAGNETS- - CONFIGURATION
AERODYNAMICS
COMPARATIVE EVALUATIONS
DRAG
EDDY CURRENTS
EFFICIENCY
ELECTROMAGNETS
OPTIMIZATION