Patent ID: 8578592

Claim:
A method of manufacturing a laminated rotor core, including laminating a plurality of core sheets to form an iron core with a plurality of magnet insertion portions, inserting permanent magnets into the magnet insertion portions of the iron core and injecting resin into the magnet insertion portions from resin reservoir parts formed in any one of an upper die and a lower die holding the iron core, and thereby fixing the permanent magnets, the method comprising: a first process of placing segment dummy plates between the iron core and the die, each of the segment dummy plates covering one or more of the plural magnet insertion portions and including a resin injection hole communicating to the one or more of the magnet insertion portions; a second process of injecting the resin from each of the resin reservoir parts of the die through the resin injection hole of each dummy plate to the corresponding one or more of the magnet insertion portions; and a third process of detaching the segment dummy plates together with excess resin after the resin injected to the one or more of the magnet insertion portions is cured.