| http://www.w3.org/ns/prov#value | - In correspondence with the increase of the angle of end-to-end abutment of the permanent magnets 45 and increase of the width of the permanent magnets 45, each of the shortcircuit rings 44 employed in the present invention is not round in shape such as used in the prior art, but of a generally rhombic shape, as shown in FIG. 14, having its outer contour positioned outwardly of the magnet retaining
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