US 12,470,098 B2
Rotor structure of rotary electric machine
Naoki Itasaka, Aki-gun (JP)
Assigned to Mazda Motor Corporation, Hiroshima (JP)
Filed by Mazda Motor Corporation, Hiroshima (JP)
Filed on Jan. 9, 2024, as Appl. No. 18/407,723.
Claims priority of application No. 2023-012769 (JP), filed on Jan. 31, 2023.
Prior Publication US 2024/0258848 A1, Aug. 1, 2024
Int. Cl. H02K 1/276 (2022.01)
CPC H02K 1/2766 (2013.01) [H02K 2213/09 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A rotor structure of a rotary electric machine, the rotor structure comprising:
a rotor having a rotor core;
a stator having a stator core, the stator core being disposed radially outward of the rotor core and being separated from the rotor core with a gap therebetween; and
a plurality of magnetic pole parts provided to the rotor core and lined up in a circumferential direction of the rotor core, each of the magnetic pole parts including:
a fixed magnetic-force magnet configured to be magnetized in a radial direction of the rotor core;
an auxiliary fixed magnetic-force magnet disposed radially outward of the fixed magnetic-force magnet, and magnetized in the radial direction so that a magnetizing direction thereof becomes the same direction as that of the fixed magnetic-force magnet; and
first variable magnetic-force magnets disposed at both sides of the fixed magnetic-force magnet in the circumferential direction, respectively, a magnetization state of the first variable magnetic-force magnets being changeable in the circumferential direction by a given magnetic flux,
wherein magnetizing directions of the fixed magnetic-force magnet and the auxiliary fixed magnetic-force magnet of one of the magnetic pole parts and magnetizing directions of the fixed magnetic-force magnet and the auxiliary fixed magnetic-force magnet of another magnetic pole part adjacent to the one magnetic pole part are opposite from each other,
wherein the first variable magnetic-force magnets are located radially outward of the fixed magnetic-force magnet,
wherein a cavity part is formed in the rotor core, between the auxiliary fixed magnetic-force magnet and the first variable magnetic-force magnets in the circumferential direction, the cavity part extending from the auxiliary fixed magnetic-force magnet to the fixed magnetic-force magnet in the radial direction, and
wherein a width of the cavity part in the circumferential direction at a position of the auxiliary fixed magnetic-force magnet in the radial direction is narrower than a minimum width of the gap between the rotor core and the stator core.