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The concepts of axial-flux (AF) structure and the high-temperature superconductor (HTS) excitation are newly applied into the flux-reversal (FR) machine in this paper. With such application, a new magnetless AF-FRHTS machine is formed. The proposed machine inherently provides a bipolar flux-linkage to enhance the performance, so that its torque density can be comparable to the permanent-magnet (PM)...
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