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Resistive contact region solid armatures: electro-thermal design optimisation

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2 Author(s)
James, T.E. ; JEMSystems, Abingdon, UK ; James, D.C.

A general method for the electro-thermal design optimisation of nontransitioning solid armatures with resistive contact regions is presented which predicts the maximum velocity at which transition to an arcing contact occurs. Comparison with a wide range of published experimental results supports the validity of the velocity skin-effect (VSE) model used. It is shown that the optimum combination of armature design parameters with copper rails requires a contact region resistivity within the range of molybdenum to titanium and that transition velocities, as limited by the VSE, of >2.5 km/s should be achieved with 90 mm bore armatures and these optimum parameters.<>

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Magnetics, IEEE Transactions on  (Volume:31 ,  Issue: 1 )