Device for manufacturing rotor core, method for manufacturing rotor core, and rotor structure

Abstract

Provided is a device for manufacturing a rotor core with less magnetic flux leakage, a method for manufacturing the rotor core, and a rotor structure. Included are a first mold including a fitting recess that fits and holds a laminated iron core in which a magnet is inserted into a magnet insertion hole; a second mold that clamps and seals the laminated iron core together with the first mold; a resin injection unit that is provided to the second mold and injects a resin material in the magnet insertion hole by using a molding machine; and a protrusion that is inserted into the magnet insertion hole by a predetermined insertion amount, and positions and holds the magnet by an end of the magnet being brought into contact with the protrusion, in a state of the first mold and the second mold being clamped.

What is claimed is: 
     
         1 . A method for manufacturing a rotor core, the method comprising:
 a first mold mounting step of inserting a protrusion by a predetermined insertion amount into a magnet insertion hole that penetrates from one end to an other end in an axis line direction of a laminated iron core in which a magnet is inserted into a magnet insertion hole, or between a laminated iron core in which a magnet and an exterior member are mounted on an outer circumferential side and the exterior member, and fitting and arranging the laminated iron core in a fitting recess of a first mold from a side of the one end;   a second mold mounting step of engaging a second mold with the first mold, and clamping and sealing the laminated iron core together with the first mold; and   a resin injecting step of injecting a resin material into the magnet insertion hole or between the exterior member and the laminated iron core through a resin injection unit provided in the first mold or the second mold.   
     
     
         2 . The method for manufacturing the rotor core according to  claim 1 , wherein the laminated iron core is fit in the fitting recess of the first mold, a manufacturing jig provided with the protrusion is provided between an inner surface of the first mold and the one end of the laminated iron core, and the protrusion is inserted by a predetermined insertion amount into the magnet insertion hole or between the exterior member and the laminated iron core. 
     
     
         3 . The method for manufacturing the rotor core according to  claim 1 , wherein
 the protrusion is provided to the first mold, and   the laminated iron core is fit in the fitting recess of the first mold, and the protrusion is inserted by a predetermined insertion amount into the magnet insertion hole or between the exterior member and the laminated iron core.