Method of resin sealing permanent magnets in laminated rotor core

An apparatus for resin sealing permanent magnets, wherein the permanent magnets inserted in a plurality of magnet insertion holes formed in a laminated rotor core are fixed by injecting resin material into the magnet insertion holes, the laminated rotor core being formed by laminating a plurality of core pieces, comprising:

• a lower die provided with a first heating means to heat the laminated rotor core from below, the first heating means also being vertically movable, while the laminated rotor core being placed on the lower die;
• an upper die provided with a second heating means to heat the laminated rotor core from above and also provided with a plurality of resin reservoir pots in which the raw resin material is injected, while the upper die being placed on the laminated rotor core;
• a middle stationary plate fixed and disposed upward on the upper die;
• and
• a plurality of plungers pressurizing the respective resin material injected into the elevated resin reservoir pots of the upper die through the middle stationary plate.