Abstract: In an IPM rotor, a first core sheet has a first sheet hole forming a part of an accommodation hole. The first sheet hole has an edge portion having a flat spring portion which is bent by a magnet through insertion of the magnet into the accommodation hole. A pair of recesses forming a clearance with respect to the magnet are formed at both side portions of the flat spring portion of the edge portion of the first sheet hole. A size of the clearance is set based on a relationship between a magnitude of a pressing force of the flat spring portion on the magnet and variation in pressing force.

Abstract: A rotor core of a rotating electrical machine has interpole bridges each disposed on an outer circumferential side with respect to a permanent magnet in a non-magnetic portion between the poles, and interpole diameter bridges each surrounded by two permanent magnets and an interpole bridge. The outer circumferential surface of each interpole bridge is formed by a first flat surface. Thus, a path of a magnetic flux passing through a magnetic gap is lengthened, so that a q-axis inductance is reduced. In addition, a width in a radial direction of each interpole bridge and a width in a circumferential direction of each interpole diameter bridge are constant, and each interpole bridge and each interpole diameter bridge are disposed so as to be perpendicular to each other to form a T shape. Thus, the concentration of stress during press-fitting of the permanent magnet into a magnet hole can be reduced.

Abstract: A permanent magnet motor includes a stator, and a rotor having a rotor core disposed opposing an inner side of the stator across an air gap, a permanent magnet disposed in a circumferential direction of the rotor core, and a field pole of the rotor core in which the permanent magnet is disposed, wherein the field pole has a radius smaller than an arc centered on a shaft attached to an inner side of the rotor, a multiple of a slit whose longitudinal axial direction is a radial direction of the rotor core are formed in the field pole, and an interval between a first central line positioned between a multiple of the slit and a second central line positioned between a neighboring multiple of the slit is enlarged as the first central line and the second central line head toward an outer peripheral side of the rotor core.

Abstract: A rotor core of a rotating electrical machine has interpole bridges each disposed on an outer circumferential side with respect to a permanent magnet in a non-magnetic portion between the poles, and interpole diameter bridges each surrounded by two permanent magnets and an interpole bridge. The outer circumferential surface of each interpole bridge is formed by a first flat surface. Thus, a path of a magnetic flux passing through a magnetic gap is lengthened, so that a q-axis inductance is reduced. In addition, a width in a radial direction of each interpole bridge and a width in a circumferential direction of each interpole diameter bridge are constant, and each interpole bridge and each interpole diameter bridge are disposed so as to be perpendicular to each other to form a T shape. Thus, the concentration of stress during press-fitting of the permanent magnet into a magnet hole can be reduced.

Abstract: In an IPM rotor, a first core sheet has a first sheet hole forming a part of an accommodation hole. The first sheet hole has an edge portion having a flat spring portion which is bent by a magnet through insertion of the magnet into the accommodation hole. A pair of recesses forming a clearance with respect to the magnet are formed at both side portions of the flat spring portion of the edge portion of the first sheet hole. A size of the clearance is set based on a relationship between a magnitude of a pressing force of the flat spring portion on the magnet and variation in pressing force.

Abstract: A permanent magnet motor includes a stator, and a rotor having a rotor core disposed opposing an inner side of the stator across an air gap, a permanent magnet disposed in a circumferential direction of the rotor core, and a field pole of the rotor core in which the permanent magnet is disposed, wherein the field pole has a radius smaller than an arc centered on a shaft attached to an inner side of the rotor, a multiple of a slit whose longitudinal axial direction is a radial direction of the rotor core are formed in the field pole, and an interval between a first central line positioned between a multiple of the slit and a second central line positioned between a neighboring multiple of the slit is enlarged as the first central line and the second central line head toward an outer peripheral side of the rotor core.