When a nonmagnetic high-strength metallic retaining sleeve offers advantages over a nonmetallic (e.g., carbon fiber) one, it is possible to consider the application of a high-conductivity shield ldquocoatingrdquo on this sleeve to reduce the surface eddy-current losses due to nonsynchronous fields. One can start by using a Maxwell's equation-based analytical model to ldquoscreenrdquo for the optimal shield thickness and then employ a ldquo2.5 Drdquo finite-element method that accounts for periodic fields and finite rotor length, including axial segmentation and/or copper cladding. These are quantified to help design a low-loss rotor sleeve for a surface permanent-magnet machine with fractional-slot concentrated armature winding. With this type of winding, the sleeve losses can be significant due to its rich (read parasitic) asynchronous harmonic armature reaction MMF content.
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Shah et al. (2009) studied this question.
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