Segmented permanent magnet rotor for high speed synchronous machines

摘要

A segmented permanent-magnet rotor for high-speed synchronous machines reduces eddy-current losses by axially segmenting the containment sleeve (21) and the permanent magnets (28a-h). The axial segmentation of the containment sleeve includes forming grooves (24a-c) circumferentially around the outer surface of the containment sleeve (21). The circumferential grooves (24a-c) disrupt the generation of eddy currents on the outer surface of the containment sleeve and therefore reduce eddy-current losses in the containment sleeve (21). Axial segmentation of the permanent magnets (28a-h) also disrupts eddy current formation, thereby reducing eddy current losses in the permanent magnets. In addition, the presence of an electrically insulating layer (26) between the containment sleeve (21) and the permanent magnets (28a-h) reduces eddy current migration from the containment sleeve (21) to the permanent magnets (28a-h), and therefore provides additional reduction of eddy-current losses.