US 12,476,502 B2
Rotor, IPM motor including same, and rotor manufacturing method
Yosuke Tanaka, Kyoto (JP); Takeshi Honda, Kyoto (JP); Hirofumi Muto, Kyoto (JP); Hideki Tsuji, Kyoto (JP); and Yuya Danjo, Kyoto (JP)
Assigned to NIDEC CORPORATION, Kyoto (JP)
Filed by NIDEC CORPORATION, Kyoto (JP)
Filed on Sep. 25, 2023, as Appl. No. 18/473,280.
Claims priority of application No. 2022-155727 (JP), filed on Sep. 29, 2022.
Prior Publication US 2024/0113576 A1, Apr. 4, 2024
Int. Cl. H02K 1/27 (2022.01); H02K 1/276 (2022.01); H02K 15/03 (2006.01)
CPC H02K 1/276 (2013.01) [H02K 15/03 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A rotor comprising:
a rotor core in a columnar shape having a plurality of core plates stacked in a thickness direction and a magnet insertion hole extending in an axial direction; and
a magnet inserted into the magnet insertion hole, wherein
the plurality of core plates include
a first core plate, and
a second core plate stacked frontward in a magnet insertion direction that is a direction in which the magnet is inserted into the magnet insertion hole with respect to of the first core plate,
the first core plate includes
a first insertion through hole penetrating the first core plate in a thickness direction to constitute a part of the magnet insertion hole,
a first protrusion portion protruding toward an inside of the first insertion through hole, and
a first deformation permission portion located in a position in an opposite direction to a protrusion direction of the first protrusion portion with respect to the first protrusion portion when the rotor core is viewed from the axial direction and permitting deformation of the first protrusion portion in the opposite direction, and
the second core plate includes
a second insertion through hole penetrating the second core plate in a thickness direction to constitute a part of the magnet insertion hole, and
at least one of a recess portion recessed in the opposite direction in a position overlapping the first protrusion portion when the rotor core is viewed from the axial direction, and a second deformation permission portion that is located at a position in the opposite direction with respect to the first protrusion portion when the rotor core is viewed from the axial direction and permits an inner surface of the second insertion through hole to be deformed in the opposite direction.