Patent ID: 9705369
Date: 2017-07-11
CPC Classifications: B29C,B29L,H02K

Claim:
1. A method of resin-sealing a laminated core, comprising: laminating a plurality of core pieces to form a core body including a plurality of magnet insertion holes circumferentially; inserting permanent magnets having a rectangular cross-section into each of the magnet insertion holes of the core body; pressing the core body with an upper die and a lower die in a direction where the core pieces are laminated; and injecting resin to the magnet insertion holes from a plurality of resin reservoirs provided in the upper die or the lower die, each pair of one of the plurality of resin reservoirs and one or more than one of the plurality of magnet insertion holes being connected via a corresponding runner formed in a removable cull plate, and thereby fixing the permanent magnets; wherein an end of each runner comprises a plurality of resin injection holes with respect to a corresponding one of the magnet insertion holes, the resin injection holes being formed only along and facing one of longitudinal sidewalls of each of the permanent magnets, and wherein the injected resin presses the permanent magnets inserted in the magnet insertion holes to one side in a radial direction of each of the magnet insertion holes.