Provided is a rotor for a permanent magnet rotary electric machine, which enables the bonding of a permanent magnet to a rotor core in a skewed manner with respect to an axial direction of the rotor core. The rotor includes a rotor core including a cylindrical portion and a pair of polygonal colmnar portions provided to both ends of the cylindrical portion in the axial direction, and a permanent magnet having a bonding surface, which is flat and bonded to the rotor core. The pair of polygonal columnar portions has flat surfaces that are arranged so that center positions are spaced apart from each other as viewed in the axial direction. The bonding surface of the permanent magnet is bonded to the respective flat surfaces of the pair of polygonal columnar portions under a state in which the permanent magnet is skewed with respect to the axial direction.

First and second sets of magnet assemblies and magnetic assemblies are alternately arranged in a circumferential direction in a first portion along an axial direction, and the first and second sets are alternately arranged in the circumferential direction in a second portion along the axial direction. When viewed in the axial direction, the first set of the first portion and the second set of the second portion overlap with each other, and the second set of the first portion and the first set of the second portion overlap with each other.

In a rotary electric machine, magnets provided in a core generate circumferentially arranged magnetic poles. Each magnetic pole defines d- and q-axes. The d-axis represents a center of the corresponding magnetic pole. The rotary electric machine includes an armature including an armature winding. Each magnet includes a magnet body having opposing first and second flux effective surfaces. The first flux effective surface is a surface out of which magnetic flux flows. The second flux effective surface into which magnetic flux flows. The magnet body has a thickness defined as a minimum distance between the first and second flux effective surfaces. The magnet body has easy axes of magnetization. A length of a line along at least one of the easy axes of magnetization between the first and second flux effective surfaces is longer than the thickness of the magnet body.

The present invention provides a rotor core, which comprises a plurality of grooves formed at the same interval along the circumferential direction, wherein the number of the grooves is an integer multiple of the least common multiple of commonly used pole number.

A rotor of an electric machine has a circumferential surface and a permanent-magnet structure on the circumferential surface . A contour of the permanent-magnet structure has a stepped section with several steps, whereby each step has a first extension that is oriented essentially perpendicularly to the circumferential direction of the circumferential surface as well as a second extension that is oriented parallel to the circumferential direction and that connects the first extension to a first extension of an adjacent step. The first extension of a first step differs from the first extension of a second step that is adjacent to the first step and/or the second extension of a first step differs from the second extension of the second step.

The rotor includes a drive shaft, a first rotor core unit, and a second rotor core unit. The first rotor core unit is configured from a first iron core material having a through-hole into which the drive shaft is inserted, and a plurality of first permanent magnets, and includes a first reference surface at which the first iron core material is flush with or protruding further than first permanent magnets. The second rotor core unit is configured from a second iron core material having a through-hole into which the drive shaft is inserted, and a plurality of second permanent magnets, and has a second reference surface at which the second iron core material is flush with or protruding further than second permanent magnets, the second rotor core unit being laminated in an axial direction on the first rotor core unit such that the first reference surface and the second reference surface contact each other.

An interior permanent magnet motor comprising a rotor having a set of permanent magnets placed within the interior of the rotor and a stator which surrounds the rotor and has a set of stator teeth defining slots between adjacent teeth. The stator also includes a plurality of stator windings that extend around the teeth and within the slots, the rotor and stator defining an airgap there between, in which an outer peripheral surface of the rotor that faces the stator across the airgap is provided with a respective eccentric bulge in the region of each rotor magnet. The bulge has a part-elliptical shape, the centre of the circumference of the bulge lying on or close to an axis that passes through the axis of rotation of the rotor and through a point on or close to the circumferential centre of the associated magnet, and in which the two ends of the part-elliptical bulge respectively connect to a region of the periphery that interconnects to an adjacent bulge, in which the dimensions of the bulge are selected so as to optimise the motor in terms of minimising variations in cogging torque that arise due to geometric manufacturing errors.

Disclosed is a resolver, which includes a stator having at least one excitation coil and at least one output coil, and a rotor disposed at a center space in the stator with a predetermined gap from the stator, the rotor rotating based on a rotary shaft to change a gap permeance with respect to the stator, wherein the stator includes a back yoke having a ring-shaped body, and a plurality of teeth formed at an inner circumference of the back yoke so that the excitation coil and the output coil are wound thereon, wherein the rotor includes a ring-shaped body having a center hole into which the rotary shaft is inserted, and a plurality of salient poles formed at an outer circumference of the ring-shaped body.

A rotary electric machine having a stator, and a rotor having a shaft and permanent magnets on the surface of the shaft, the permanent magnets having a face of concave overall shape directed toward the stator.

A rotor includes permanent magnets, an annular outer periphery side iron core (first core) disposed on the inner diameter side of the permanent magnets, an annular inner periphery side iron core (second core) disposed on the inner diameter side of the first core, and an insulating member insulating the first core and the second core from each other. The first core includes positioning convex portions protruding from the outer periphery toward the outer diameter side, formed in the circumferential direction and positioning the permanent magnets, and outer periphery side rotation locking concave portions being concave from the inner periphery toward the outer diameter side and formed in the circumferential direction. The positioning convex portions and the outer periphery side rotation locking concave portions are formed in positions overlapping each other when viewed in the radial direction from the central axis of the second core.