US 12,176,763 B2
Rotating electrical machine
Yuki Takahashi, Kariya (JP)
Assigned to DENSO CORPORATION, Kariya (JP)
Filed by DENSO CORPORATION, Kariya (JP)
Filed on Jun. 13, 2022, as Appl. No. 17/838,809.
Application 17/838,809 is a continuation of application No. PCT/JP2020/046134, filed on Dec. 10, 2020.
Claims priority of application No. 2019-225365 (JP), filed on Dec. 13, 2019.
Prior Publication US 2022/0320927 A1, Oct. 6, 2022
Int. Cl. H02K 1/27 (2022.01); H02K 1/27915 (2022.01)
CPC H02K 1/27915 (2022.01) 3 Claims
OG exemplary drawing
 
1. A rotating electrical machine comprising:
a magnetic field-producing unit including a magnet unit which is equipped with a plurality of magnetic poles whose polarities alternate in a circumferential direction of the magnet unit;
an armature which includes a multi-phase armature winding; and
a rotor which is implemented by one of the magnetic field-producing unit and the armature, wherein
the magnet unit includes a plurality of arc-shaped magnets arranged in the circumferential direction and a magnet holder to which the magnets are secured,
each of the magnets has arc-shaped easy axes of magnetization which extend more parallel to a d-axis, which is a center of the magnetic pole, in a region close to the d-axis than those in a region close to a q-axis, which is a magnetic boundary between the poles, the easy axes of magnetization defining arc-shaped magnetic paths extending therealong,
the magnets are arranged to be separate from each other across the d-axis or the q-axis,
each of the magnets has a q-axis end surface facing in the circumferential direction, the q-axis end surfaces of the magnets which are arranged adjacent each other in the circumferential direction being placed in surface-to-surface contact with each other,
each of the magnets has an armature-remote peripheral surface which faces away from the armature, each of the armature-remote peripheral surfaces facing an attachment surface of the magnet holder through a clearance which is filled with a resin adhesive, and
each of the magnets has a d-axis end surface facing in the circumferential direction, the d-axis end surface of each of the magnets being arranged adjacent to and away from the d-axis end surface of a respective adjacent one of the magnets through a clearance therebetween in the circumferential direction.