Patent ID: 9520218
Filing Date: 2016-12-13
CPC Classification: H01F,H02K

Claim Text:
1. 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.