Contact pressure distribution and transition in solid armatures [EM launchers]

Previous theoretical predictions of the transition velocity of solid armatures based on the velocity skin-effect (VSE) usually assume that adequate rail/armature contact pressure exists at the rear armature surface. It has also been shown that the rear angle (/spl phi/) of a triangular armature cont...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2001-01, Vol.37 (1), p.81-85
Main Authors: James, T.E., James, D.C.
Format: Article
Language:English
Subjects:
Applied sciences
Armature
Boring
Electrical engineering. Electrical power engineering
Exact sciences and technology
Geometry
Magnetic analysis
Magnetic fields
Magnetic forces
Magnetic levitation, propulsion and control devices
Magnetic separation
Magnetism
Mathematical models
Miscellaneous
Packaging
Rails
Solid modeling
Various equipment and components
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Summary:Previous theoretical predictions of the transition velocity of solid armatures based on the velocity skin-effect (VSE) usually assume that adequate rail/armature contact pressure exists at the rear armature surface. It has also been shown that the rear angle (/spl phi/) of a triangular armature contact region should be minimized but that for /spl phi/10 mm and for values of /spl phi/ from 12/spl deg/ to 90/spl deg/. It is shown that the absence of adequate contact pressure at the rear armature surface results in significant reductions in the transition velocity in reasonable agreement with experimental results reported previously. An armature concept to overcome these reductions in transition velocity is discussed in which the rear armature contact regions (with /spl phi/
ISSN:0018-9464
1941-0069
DOI:10.1109/20.911796