Rotor Manufacturing Method and Rotor

A manufacturing method for a rotor including a rotor core configured by laminated steel plates and by a magnet insertion hole extending along an axial direction of the rotor core, with a resin interposed between a permanent magnet placed in the magnet insertion hole and an inner wall face of the magnet insertion hole, the rotor manufacturing method comprising:

• a first process of integrating the permanent magnet and the resin together to manufacture a resin-coated permanent magnet larger than the magnet insertion hole in a rotor radial direction;
• a second process of heating the rotor core to a temperature that is at least a temperature at which the magnet insertion hole enlarges to a size to allow contact-free insertion of the resin-coated permanent magnet and that is also at least a temperature at which the resin softens;
• a third process of inserting the resin-coated permanent magnet into the magnet insertion hole in the rotor core in a heated state achieved by the second process;
• and
• a fourth process of cooling the post-third process rotor core.

A rotor comprising:

• a rotor core configured by laminated steel plates and a magnet insertion hole extending along an axial direction of the rotor core;
• a permanent magnet placed in the magnet insertion hole;
• and
• a resin integrated together with the permanent magnet and interposed between the permanent magnet and an inner wall face of the magnet insertion hole;
• the resin being pressed in a rotor radial direction against the inner wall face and deformed so as to be fitted closely against undulations of the inner wall face.