Abstract
A theory of magnetic damper (eddy-current brake) which can be applied to axial-flux rotating and linear systems moving under the influence of an arbitrary arrangement of magnetic poles is derived from basic electromagnetic principles. Analytical expressions for the braking forces and torques are obtained in the low-velocity limit of the moving nonmagnetic conductor.
Highlights
When a nonmagnetic conductor moves exposed to a constant external magnetic field, eddy currents may be induced in the material
We have presented a theory of magnetic braking based on the analytical calculation of the charge densities induced on a moving conductor
Through electrostatics and magnetostatics we derived analytical expressions for the braking torques and forces in an unified formalism, valid for rotating and linear magnetic brakes with round poles and low operating speeds, when the magnetic field due to the induced currents is negligible in comparison with the external field
Summary
When a nonmagnetic conductor moves exposed to a constant external magnetic field, eddy currents may be induced in the material. Depending on the geometries of the conductor and the magnetic field, these space charges may be accompanied by an electric current density J, as in the case of the Faraday’s first dynamo [9, 10] and the induction motor [11] References to these space charges on a magnetic brake made up of a disk rotating under the magnetic field of a single pole can be found in literature, [12, 13, 14, 15, 16, 17] in the context of analytical calculations of forces and torques
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