US 12,218,547 B2
Rotor
Masanori Ozaki, Kariya (JP)
Assigned to DENSO CORPORATION, Kariya (JP)
Filed by DENSO CORPORATION, Kariya (JP)
Filed on Aug. 17, 2022, as Appl. No. 17/889,837.
Application 17/889,837 is a continuation of application No. PCT/JP2021/005604, filed on Feb. 16, 2021.
Claims priority of application No. 2020-024208 (JP), filed on Feb. 17, 2020.
Prior Publication US 2022/0393531 A1, Dec. 8, 2022
Int. Cl. H02K 1/276 (2022.01); H02K 1/27 (2022.01); H02K 1/274 (2022.01); H02K 1/2746 (2022.01)
CPC H02K 1/276 (2013.01) [H02K 1/27 (2013.01); H02K 1/274 (2013.01); H02K 1/2746 (2013.01)] 3 Claims
OG exemplary drawing
 
1. A rotor comprising:
a rotor core having magnet-receiving holes formed therein;
permanent magnets embedded respectively in the magnet-receiving holes of the rotor core, each of the permanent magnets having a folded shape that is convex radially inward; and
an annular end magnet, wherein
the rotor is configured to generate both magnet torque by the permanent magnets and reluctance torque by outer core portions located on a radially outer side of the permanent magnets in the rotor core,
the annular end magnet is located at a position facing axial end faces of the outer core portions of the rotor core and has magnetic poles arranged so as to respectively repel the outer core portions,
each of radially-outer end portions of the magnet-receiving holes has a curved shape such that the distance between the radially-outer end portions and a radially outer periphery of the rotor core is shortened at a center of the radially-outer end portions in a circumferential direction of the rotor,
the magnet-receiving holes have differently-shaped portions that are formed in part of an axial range of the magnet-receiving holes and shaped differently from other portions of the magnet-receiving holes,
the differently-shaped portions are formed at axial centers of the magnet-receiving holes,
the permanent magnets are bonded magnets filled respectively in the magnet-receiving holes, and
the permanent magnets axially engage with the differently-shaped portions of the magnet-receiving holes.