METHOD OF MANUFACTURING PERMANENT MAGNET SEGMENT

摘要

PROBLEM TO BE SOLVED: To provide a technology for manufacturing a permanent magnet for a motor wherein the number of divided permanent magnet segments and the shapes of the divided permanent magnet segments, which are most suitable for suppressing the loss and heat produced by an eddy current with a necessary ratio and for reducing the cost as low as possible, are obtained. SOLUTION: A permanent magnet base material is divided into a plurality of permanent magnet segments only in the shaft direction or in the circumferential direction of a motor so as to make the shapes of the magnet segments have aspect ratios in magnetizing directions within a range of 2 to 10. Further, the number of the divided permanent magnet segments are determined according to corresponding relations between eddy current losses and the aspect ratios in the magnetizing directions or the number of the divided segments.