US 11,990,804 B2
Rotating electric machine
Akito Tamura, Kariya (JP); Yuki Takahashi, Kariya (JP); and Atsushi Umeda, Kariya (JP)
Assigned to DENSO CORPORATION, Kariya (JP)
Filed by DENSO CORPORATION, Kariya (JP)
Filed on Aug. 24, 2021, as Appl. No. 17/410,850.
Application 17/410,850 is a continuation of application No. PCT/JP2020/006142, filed on Feb. 17, 2020.
Claims priority of application No. 2019-032185 (JP), filed on Feb. 25, 2019.
Prior Publication US 2021/0384808 A1, Dec. 9, 2021
Int. Cl. H02K 21/14 (2006.01)
CPC H02K 21/14 (2013.01) [H02K 2213/03 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A rotating electric machine comprising:
a field system including a magnet section having a plurality of magnetic poles whose polarities alternate in a circumferential direction; and
an armature including a multi-phase armature coil,
wherein
either of the field system and the armature is configured as a rotor,
the magnet section is configured to have easy axes of magnetization oriented such that at locations closer to a d-axis, directions of the easy axes of magnetization are more parallel to the d-axis than at locations closer to a q-axis, the d-axis representing centers of the magnetic poles of the magnet section, the q-axis representing boundaries between the magnetic poles,
the magnet section has an intrinsic coercive force higher than or equal to 400 [kA/m] and a residual flux density higher than or equal to 1.0 [T],
the armature coil has electrical conductor sections arranged at positions facing the field system and at predetermined intervals in the circumferential direction,
in the armature, there are provided inter-conductor members between the electrical conductor sections in the circumferential direction or no inter-conductor members are provided between the electrical conductor sections in the circumferential direction,
the inter-conductor members are formed of a magnetic material satisfying the following relationship or formed of a nonmagnetic material,
Wt×Bs<Wm×Br
where Wt is a circumferential width of the inter-conductor members in each magnetic pole, Bs is a saturation flux density of the inter-conductor members, Wm is a circumferential width of the magnet section in each magnetic pole and Br is a residual flux density of the magnet section,
the armature coil includes a plurality of phase windings for respective phases, each of the phase windings being constituted of a plurality of partial windings,
each of the partial windings is formed of an electrical conductor that is multiply wound in the electrical conductor sections of the same phase which are arranged apart from each other in the circumferential direction, and
in each of the phase windings of the armature coil, the partial windings constituting the phase winding are connected in parallel with each other.