Patent ID: 7653984

Claim:
A method of resin sealing permanent magnets in a laminated rotor core, comprising: a first process of placing and preheating the laminated rotor core in a preheating device, the 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 the permanent magnets around a central axial hole; a second process of removing the preheated laminated rotor core from the preheating device and disposing the laminated rotor core having the permanent magnets inserted therein between upper and lower dies of a resin sealing apparatus; a third 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 being formed in the upper die so as to extend to a surface thereof that contacts the laminated rotor core; and a fourth 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 reservoir pots penetrate the upper die.