Rotor Eddy-Current Losses Reduction in an Axial Flux Permanent-Magnet Machine | IEEE Journals & Magazine | IEEE Xplore

Rotor Eddy-Current Losses Reduction in an Axial Flux Permanent-Magnet Machine


Abstract:

A novel rotor structure for a tooth-coil-winding (concentrated winding) open-slot axial-flux permanent-magnet (PM) machine that reduces the eddy currents and increases th...Show More

Abstract:

A novel rotor structure for a tooth-coil-winding (concentrated winding) open-slot axial-flux permanent-magnet (PM) machine that reduces the eddy currents and increases the main flux linkage is proposed in this paper. A composite-body-based rotor assembly and a steel-laminated layer inserted on top of the magnets are used to reduce eddy-current losses in the PMs. A prototype of an axial flux generator for a heavy-duty vehicle following this structure is optimized, analyzed and measured. The tooth coil windings produce high-amplitude harmonics in the air gap and the large slot openings reduce the rotor flux. Consequently, a rotor structure that decreases the amount of harmonics travelling through the magnets is required. Steel laminations covering the magnets have positive effects on both phenomena. Two-dimensional and three-dimensional finite-element analysis is used to verify and optimize the geometry of the laminations. Computations are verified by experimental measurements of a 100 kW test machine prototype.
Published in: IEEE Transactions on Industrial Electronics ( Volume: 63, Issue: 8, August 2016)
Page(s): 4729 - 4737
Date of Publication: 28 March 2016

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