Methods for Eddy Current Energy Losses Reduction in Vortex-Layer Devices

This paper discusses several methods to reduce the eddy current energy losses in a working area of the vortex-layer devices. Using a known mathematical model numerical experiments were carried out to evaluate effectiveness, to identify and analyze all the advantages and disadvantages for each of the proposed methods. The calculation results are presented as graphs of the dependences of the energy losses on the working area shell thickness and on the frequency of the field inductors; as graphs of the distribution eddy current flow function along the working area shell length with the varying field frequency; as graphs of the distribution primary magnetic field and shell reaction field on the symmetry axis. It was established that for the three-inductor vortex-layer device addition of two equally spaced orthogonal cuts in the working area shell leads to a 43% energy losses reduction, and an alternating configuration of the inductors gives a reduction from 20% to 29% depending on the connection method.