US 12,283,847 B2
Rotor of rotary electric machine, rotary electric machine and electric drive device
Masahiro Hori, Tokyo (JP); and Masanori Sawahata, Tokyo (JP)
Assigned to Hitachi Astemo, Ltd., Hitachinaka (JP)
Appl. No. 18/017,911
Filed by Hitachi Astemo, Ltd., Hitachinaka (JP)
PCT Filed May 18, 2021, PCT No. PCT/JP2021/018748
§ 371(c)(1), (2) Date Jan. 25, 2023,
PCT Pub. No. WO2022/054339, PCT Pub. Date Mar. 17, 2022.
Claims priority of application No. 2020-151189 (JP), filed on Sep. 9, 2020.
Prior Publication US 2023/0283125 A1, Sep. 7, 2023
Int. Cl. H02K 1/276 (2022.01); H02K 1/32 (2006.01)
CPC H02K 1/276 (2013.01) [H02K 1/32 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A rotor of a rotary electric machine, the rotor comprising: a magnet; and a rotor core that has a magnet housing portion which houses the magnet,
wherein
in a lateral cross section perpendicular to an axial direction of a rotating shaft, the magnet is arranged such that a q-axis side portion is located on an outer diameter side with respect to a d-axis side portion, and a magnet thickness on an inner diameter side of the rotor core is formed to be larger than a magnet thickness on an outer diameter side of the rotor core,
an axial space formed along the axial direction is formed in the magnet, and
the axial space is formed such that when the lateral cross section of the magnet is divided into an outer diameter side region and an inner diameter side region in a manner that lateral cross section areas including a cross section of the axial space are equal to each other with a circumference around a rotation center as a boundary, a space density of the axial space in the inner diameter side region is larger than a space density of the axial space in the outer diameter side region.