The aim of this paper is to investigate and evaluate the eddy current losses in conductive retaining sleeves of Permanent Magnet Synchronous Motors (PMSMs). High speed synchronous machines with surface-mounted PMs often require a bandage to fix the magnets to the rotor surface. A stainless steel sleeve is potentially a viable solution: the eddy current losses in this region are investigated using an analytical approach. The power losses due to the eddy-currents induced in the sleeve are evaluated in several different no-load and loaded working conditions. Finite-Element Method (FEM) simulations with two-dimensional and three-dimensional models validate the analytical results.
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Lazzari et al. (2010) studied this question.