INTERIOR PERMANENT MAGNET ROTOR AND METHOD FOR MANUFACTURING THE SAME

摘要

An interior permanent magnet rotor restrains demagnetization of permanent magnets embedded in a core 12. Each permanent magnet is formed by joining a first portion 16a and a second portion 16b at a connection CS. The first and second portions 16a, 16b extend from the outer side toward the inner side in the radial direction of the core 12. The outer end faces ES of the first and second portions 16a, 16b in the radial direction of the core 12 extend in an orientation direction MO as viewed in section perpendicular to the axial direction Da. The outside diameter of the core 12 gradually increases from the boundaries BL between a single magnetic pole and magnetic poles adjoining the single magnetic pole toward the middle of the single magnetic pole in the circumferential direction of the core 12.