Method of resin-sealing laminated core

A method of resin-sealing for a laminated core, the method comprising the steps of:

• holding by sandwiching a core body between a resin injection mold and a supporting mold that face each other, the core body having a plurality of magnet insertion holes in which permanent magnets are respectively inserted;
• extruding a molten resin using a plunger from each of resin reservoir pots provided in the resin injection mold;
• and
• resin-sealing the permanent magnets in the magnet insertion holes,
• wherein a material of the resin reservoir pot of the resin injection mold and a region through which the resin passes from the resin reservoir pot is a superhard material, and wear in the resin injection mold due to a flow of the resin is reduced,
• wherein the superhard material has a hardness HRA 80-100, or above,
• wherein the resin injection mold includes a cylindrical body having the resin reservoir pot and the region through which the resin passes and made of the superhard material;
• and a resin injection mold body supporting the cylindrical body and made of steel,
• wherein injection holes are provided inside an outer periphery of the cylindrical body, the injection holes respectively communicating to the magnet insertion holes of the core body,
• wherein runners respectively connecting the injection holes and the resin reservoir pots are provided, and
• wherein the runners are provided in the bottom of the cylindrical body.