Patent ID: 8624459

Claim:
A rotor of an electric rotating machine, comprising: a laminated body, having a plurality of core layer units serially located along an axial direction so as to place an outer magnetic body on an outer side of the core layer units in a radial direction, that is rotatable about a center axis extending along the axial direction, each of the core layer units comprising: a field coil, wound in a cylindrical shape around the center axis of the laminated body, that generates a magnetic flux; a first rotor core, located on a first axial side of the field coil in the axial direction, that receives the magnetic flux; a second rotor core, located on a second axial side of the field coil in the axial direction, that receives the magnetic flux; a first non-magnetic body that is located on the second axial side of the first rotor core; and a second non-magnetic body that is located on the first axial side of the second rotor core, each of the first and second rotor cores comprising: a first yoke portion formed in a cylindrical shape so as to be located on an inner side of the field coil, the first yoke portion having an outer circumferential diameter equal to a distance from the central axis of the laminated body to an outer circumferential surface of the first yoke portion in the radial direction; a second yoke portion extending from the first yoke portion toward the outer side of the field coil; and a plurality of claw-shaped magnetic poles located on the outermost side of the second yoke portion, the magnetic poles having a rotational diameter equal to a distance from the central axis of the laminated body to the magnetic poles in the radial direction such that a ratio of the outer circumferential diameter of the first yoke portion to the rotational diameter of the magnetic poles is lower than 0.54, wherein the magnetic flux directly extends from the first yoke portion of one of the first and second rotor cores to the first yoke portion of the other of the first and second rotor cores, the magnetic poles of the first rotor core and the magnetic poles of the second rotor core are alternately arranged in a circumferential direction on the outer side of the field coil, the magnetic flux indirectly extending from one magnetic pole in each pair of magnetic poles of the first and second rotor cores, the pair of magnetic poles being adjacent to each other in the circumferential direction, to the other magnetic pole through the outer magnetic body located on the outer side of the magnetic poles, the first non-magnetic body is in contact with the second yoke portion of the first rotor core on the inner side of the magnetic poles of the first rotor core, and the second non-magnetic body is in contact with the second yoke portion of the second rotor core on the inner side of the magnetic poles of the second rotor core.