Calculation of motion induced eddy current forces in null flux coils
- American Maglev, Inc., Edgewater, FL (United States)
- BDM Federal, Inc., Huntsville, AL (United States)
- Argonne National Lab., IL (United States)
Time dependent motion induced eddy current forces can be quite difficult to compute. The movement of null flux coils between magnets is approached using a coupled boundary element-circuit approach to compute the forces on the structure. The technique involves treating the magnets as a separate circuit whose current is dictated by the product of the magnet thickness and the working coercivity. The mutual inductance between the windows of the moving null flux coil and the stationary equivalent magnet coil hold the key for predicting lift, guidance, and drag forces on the coil. The rate of change of these inductances with respect to position determines the forces and currents. A steady state approximation to these forces is derived in addition to a numerical simulation when the steady state assumption is invalid. The results compare favorably to laboratory results from a 4 ft. diameter experimental test wheel.
- OSTI ID:
- 186992
- Report Number(s):
- CONF-950404-; ISSN 0018-9464; TRN: IM9609%%265
- Journal Information:
- IEEE Transactions on Magnetics, Vol. 31, Issue 6Pt2; Conference: Conference on magnetism and magnetic materials, San Antonio, TX (United States), 18-21 Apr 1995; Other Information: PBD: Nov 1995
- Country of Publication:
- United States
- Language:
- English
Similar Records
Designing with null flux coils
Magnetic damping forces in figure-eight-shaped null-flux coil suspension systems