ROTOR CORE

To provide a rotor core capable of reducing stress acting on a magnet hole inner diameter side wall surface (laminated core) of a magnet hole inside in a radial direction in the vicinity of an end part in an arc direction of a magnet inner diameter side surface of a permanent magnet.SOLUTION: A rotor core 1 includes: an arc-shaped permanent magnet 3 which becomes convex toward inside in a radial direction at a rotation center axis line C side when viewed from a rotation center axis line direction; and a laminated core 2 having an arc-shaped magnet hole 20 in which the permanent magnet 3 is arranged and which becomes convex toward inside in the radial direction when viewed from the rotation center axis line direction, and having a plurality of magnetic steel sheets P laminated and formed thereon. A radius r1 of a magnet inner diameter side surface 30 of the permanent magnet 3 located inside in the radial direction of the laminated core 2 is smaller than a radius r2 of a magnet hole inner diameter side wall surface 22 of the magnet hole 20 located inside in the radial direction.SELECTED DRAWING: Figure 2 【課題】永久磁石の磁石内径側面の円弧方向の端部付近で径方向内側の磁石孔の磁石孔内径側壁面（積層コア）に作用する応力を低減することが可能なロータコアを提供する。【解決手段】このロータコア１は、回転中心軸線方向から視て、回転中心軸線Ｃ側である径方向内側に向けて凸状となる円弧状の永久磁石３と、永久磁石３が配置され、回転中心軸線方向から視て、径方向内側に向けて凸状となる円弧状の磁石孔２０を含み、複数の電磁鋼板Ｐが積層されて形成された積層コア２と、を備え、積層コア２の径方向内側に位置する永久磁石３の磁石内径側面３０の半径ｒ１は、径方向内側に位置する磁石孔２０の磁石孔内径側壁面２２の半径ｒ２よりも小さい。【選択図】図２