US 12,231,017 B2
Electric motor with air-gap sleeve
David Finck, Forchheim (DE)
Assigned to SIEMENS AKTIENGESELLSCHAFT, Munich (DE)
Appl. No. 17/908,718
Filed by Siemens Aktiengesellschaft, Munich (DE)
PCT Filed Jan. 25, 2021, PCT No. PCT/EP2021/051623
§ 371(c)(1), (2) Date Sep. 1, 2022,
PCT Pub. No. WO2021/175511, PCT Pub. Date Sep. 10, 2021.
Claims priority of application No. 10 2020 202 781.1 (DE), filed on Mar. 4, 2020.
Prior Publication US 2023/0163657 A1, May 25, 2023
Int. Cl. H02K 5/12 (2006.01); H02K 5/128 (2006.01); H02K 9/10 (2006.01); H02K 9/197 (2006.01); H02K 11/20 (2016.01); H02K 11/30 (2016.01)
CPC H02K 5/128 (2013.01) [H02K 9/10 (2013.01); H02K 9/197 (2013.01); H02K 11/20 (2016.01); H02K 11/30 (2016.01)] 13 Claims
OG exemplary drawing
 
1. An electric motor comprising:
a rotor;
a stator;
an air-gap sleeve; and
a cooling fluid on an inner side of the stator;
wherein the air-gap sleeve seals a rotor inner region against the cooling fluid;
wherein the air-gap sleeve produces a local pressure greater than a pressure exerted by the cooling fluid against the air-gap sleeve by at least 1 bar in a region of the rotor defined by the air-gap sleeve.