US 11,735,967 B2
Rotary electric machine with rotor having permanent magnets with concave faces between two flat portions
Dominique Jourdan, Saint Genis-Laval (FR)
Assigned to MOTEURS LEROY-SOMER, Angouleme (FR)
Appl. No. 16/622,975
Filed by MOTEURS LEROY-SOMER, Angouleme (FR)
PCT Filed Jun. 12, 2018, PCT No. PCT/EP2018/065533
§ 371(c)(1), (2) Date Dec. 16, 2019,
PCT Pub. No. WO2018/229065, PCT Pub. Date Dec. 20, 2018.
Claims priority of application No. 17 55442 (FR), filed on Jun. 15, 2017.
Prior Publication US 2020/0119604 A1, Apr. 16, 2020
Int. Cl. H02K 1/27 (2022.01); H02K 1/2781 (2022.01); H02K 1/14 (2006.01)
CPC H02K 1/2781 (2022.01) [H02K 1/146 (2013.01); H02K 2201/03 (2013.01); H02K 2213/03 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A rotary electric machine having:
a stator having teeth, and
an internal rotor having a shaft and permanent magnets disposed on the surface of the shaft, the permanent magnets having a face of concave overall shape directed toward the stator, a concave face of the permanent magnet of the rotor having a concave portion, the concave portion of the concave face being disposed between two flat lateral portions,
the teeth of the stator having end faces of concave shape directed toward the rotor,
wherein the faces of concave overall shape of the permanent magnets are directed toward the stator in a radial direction outward from an axis of rotation of the rotary electric machine,
wherein a width of a permanent magnet of the rotor measured perpendicularly to the axis of rotation is between 0.1π(DS−2d)/P and 2π(DS−2d)/P mm (millimeters),
where DS is the diameter of a stator bore,
P is the number of poles of the rotor, and
d is a simple air gap, that is to say the smallest width of the air gap.