ROTOR OF PERMANENT-MAGNET EMBEDDED MOTOR, AND COMPRESSOR, BLOWER, AND REFRIGERATING/AIR CONDITIONING DEVICE USING THE ROTOR

摘要

A rotor of a permanent-magnet embedded motor includes a rotor core having magnet insertion holes along a circumferential direction and a magnet inserted into each of the holes, wherein a gap is formed at opposite ends of a hole at a time of inserting the magnet therein, an outer peripheral face of the core is formed by a first curved surface formed from a magnetic pole center to between poles, with a radial distance from a shaft center of the core being largest at the pole center on the peripheral face, and a second curved surface formed from an interpolar portion toward the pole center to intersect with the first curved surface, with the radial distance from the shaft center being smallest in the interpolar portion on the peripheral face, and wherein a length of the first curved surface is larger than a length of the second curved surface.

主权项

1. A rotor of a permanent-magnet embedded motor comprising:
a rotor core provided with a plurality of magnet insertion holes along a circumferential direction; and a permanent magnet inserted into each of the magnet insertion holes to form a magnetic pole, wherein an air gap is formed at opposite ends of the magnet insertion hole in the circumferential direction at a time of inserting the permanent magnet therein, an outer peripheral face of the rotor core is formed by a first curved surface formed from a magnetic pole center to between poles, with a radial distance from a shaft center of the rotor core being largest at the magnetic pole center on the outer peripheral face, and a second curved surface formed from an interpolar portion toward the magnetic pole center to intersect with the first curved surface, with the radial distance from the shaft center of the rotor core being smallest in the interpolar portion on the outer peripheral face, and wherein length of the first curved surface is larger than a length of the second curved surface.