Patent ID: 8415849

Claim:
A method of manufacturing an IPM (Interior Permanent Magnet) rotor having a magnet embedded in a slot formed in a core body, wherein said core body includes an end surface having the slot opened at said end surface; said method comprising the steps of: inserting said magnet into said slot; and injecting a filler to a gap between an inner wall of said slot and said magnet at a plurality of corner portions to form a holding member for holding said magnet on said core body, wherein said holding member includes a plurality of injection traces of said filler formed as thin films on said end surface arranged spaced from each other along an opening edge of said slot, said gap includes a plurality of sides extending in different directions along the outer circumference of said magnet and the plurality of corner portions, the plurality of corner portions disposed where at least two sides of the plurality of sides intersect, said plurality of injection traces are formed continuously on said end surface at said plurality of corner portions, and said plurality of injection traces have ends on said end surface and extend between said ends and said plurality of corner portions, respectively.