Patent ID: 8127431

Claim:
A method of producing a laminated rotor core being formed by a stack of a plurality of core pieces and having a plurality of magnet insertion holes for insertion of permanent magnets, the method comprising: a first process of disposing the laminated rotor core between upper and lower dies of a resin sealing apparatus after preheating of the laminated rotor core; a second process of pressing the laminated rotor core by the upper and lower dies and liquefying resin material in a plurality of resin reservoir pots by heating, the resin reservoir pots penetrating either one of the upper and lower dies so as to extend to a surface thereof that contacts the laminated rotor core; and a third process of ejecting the liquefied resin material from each of the resin reservoir pots by a plunger to fill corresponding one or more of the magnet insertion holes with the resin material and curing the resin material, the plunger being inserted and moving vertically in the each of the resin reservoir pots, wherein the resin material is overflowed from the magnet insertion holes and cured and is removed.