US 11,990,797 B2
Rotating electrical machine having a circuit for cooling magnets by the shaft
Ioan Deac, Poissy (FR); Juan Wang, Vernouillet (FR); Hussain Nouri, Nanterre (FR); and Guillaume Tardy, La Celle Saint Cloud (FR)
Assigned to NIDEC PSA EMOTORS, Carrieres sous Poissy (FR)
Appl. No. 17/423,677
Filed by NIDEC PSA EMOTORS, Carrieres sous Poissy (FR)
PCT Filed Feb. 25, 2020, PCT No. PCT/FR2020/050366
§ 371(c)(1), (2) Date Jul. 16, 2021,
PCT Pub. No. WO2020/174183, PCT Pub. Date Sep. 3, 2020.
Claims priority of application No. 1902102 (FR), filed on Feb. 28, 2019.
Prior Publication US 2022/0115926 A1, Apr. 14, 2022
Int. Cl. H02K 1/28 (2006.01); H02K 1/32 (2006.01); H02K 5/173 (2006.01); H02K 7/00 (2006.01); H02K 7/08 (2006.01); H02K 9/19 (2006.01)
CPC H02K 1/32 (2013.01) [H02K 1/28 (2013.01); H02K 5/1732 (2013.01); H02K 7/003 (2013.01); H02K 7/083 (2013.01); H02K 9/19 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A rotating electrical machine comprises:
a housing comprising two bearings, a rotor shaft mounted to rotate freely in the housing via the bearings, a rotor mounted to the rotor shaft so as to rotate the rotor shaft and comprising first and second axial end faces, and a cooling circuit comprising a coolant supply duct arranged coaxially in the rotor shaft and a radially oriented feed duct arranged in the rotor shaft and in fluid communication with the supply duct and the rotor,
wherein the cooling circuit further comprises a cooling chamber in fluid communication with the feed duct, the cooling chamber extending axially between the rotor and the rotor shaft, the cooling chamber opening onto the first and second axial end faces of the rotor and being delimited radially by an angular portion of an external surface of the rotor shaft and an angular portion of an internal surface of the rotor, the two angular portions extending opposite and at a distance from one another, and
wherein the feed duct opens into an annular groove arranged on a radially outer circumference of the external surface of the rotor shaft.