US 12,266,464 B2
Magnetic sheet stack, method for manufacturing a magnetic sheet stack and electric machine
Jörg Buschbeck, Nuremberg (DE); Gotthard Rieger, Munich (DE); Carsten Schuh, Baldham (DE); Thomas Soller, Bayern (DE); and Rolf Vollmer, Gersfeld (DE)
Assigned to SIEMENS AKTIENGESELLSCHAFT, Munich (DE)
Appl. No. 17/608,562
Filed by Siemens Aktiengesellschaft, Munich (DE)
PCT Filed Apr. 16, 2020, PCT No. PCT/EP2020/060661
§ 371(c)(1), (2) Date Nov. 3, 2021,
PCT Pub. No. WO2020/224927, PCT Pub. Date Nov. 12, 2020.
Claims priority of application No. 19172809 (EP), filed on May 6, 2019.
Prior Publication US 2022/0230799 A1, Jul. 21, 2022
Int. Cl. H01F 27/28 (2006.01); H01F 17/00 (2006.01); H02K 1/04 (2006.01); H02K 15/02 (2006.01)
CPC H01F 27/2804 (2013.01) [H01F 17/0013 (2013.01); H02K 1/04 (2013.01); H02K 15/02 (2013.01); H01F 2027/2809 (2013.01); H02K 2213/03 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A magnetic sheet stack for an electric machine, the sheet stack comprising:
a plurality of magnetic sheets electrically insulated from one another by being spaced apart from one another predominantly with a non-vanishing clearance;
a respective set of ceramic spacers distributed between each of the plurality of magnetic sheets from an adjacent sheet in the stack; and
a respective gas layer filling a gap between a predominant part of a planar extent of each of the plurality of magnetic sheets allowing a cooling fluid to be circulated between the adjacent sheets.