Patent ID: 7897089
Filing Date: 2011-03-01
Classification: B29C,B29K,H02K

Abstract:
1. A method of resin sealing permanent magnets in a laminated rotor core comprising: a first step of inserting the permanent magnets respectively in a plurality of magnet insertion holes in the laminated rotor core formed by a stack of a plurality of core pieces; a second step of disposing the laminated rotor core between a lower die and an upper die, the lower die being provided for placing the laminated rotor core thereon, the upper die pairing with the lower die and having resin reservoir pots; a third step of pressing and heating the laminated rotor core by the upper die and the lower die while heating and liquefying raw resin material put in the resin reservoir pots by the upper die; and a fourth step of filling the magnet insertion holes of the laminated rotor core with the liquefied resin material from the upper die by ejecting the liquefied resin material from the resin reservoir pots by plungers, the plungers being inserted and moving vertically in the resin reservoir pots; wherein the resin reservoir pots provided in the upper die vertically penetrate the upper die; and the resin reservoir pots in the upper die are in a region radially inward of and different from positions of the magnet insertion holes as viewed from a top thereof, and the liquefied resin material is supplied to the magnet insertion holes from the resin reservoir pots through resin passages formed on an undersurface of the upper die.