ROTOR FOR A PERMANENT-MAGNET DYNAMO-ELECTRIC MACHINE

摘要

The disclosed rotor for a permanent-magnet dynamo-electric machine has a welding groove and can be manufactured inexpensively. Even if there are variations in welding and the position of the welding groove during manufacture, excessive increases in cogging torque are inhibited and there are no large fluctuations in induced voltage. The disclosed rotor is used in a permanent-magnet dynamo-electric machine (1) that has a stator (2), with a coil wound therearound, and a rotor (5) in which permanent magnets (14a and 14b) are embedded. On the outer surface of a rotor core (11) comprising layered magnetic steel sheets, a welding groove (15) is formed so as to extend in the axial direction at an angle in the range p/6 < ? < p/2 [rad] or in the range p/2 < ? < 5p/6 [rad], where ? is the electrical angle with a line that connects the center of the rotor with a point midway between a magnetic pole created by the embedded permanent magnets and an adjacent magnetic pole.