US 12,278,527 B2
Cage rotor and method for the production thereof
Klaus Büttner, Hollstadt (DE); Klaus Kirchner, Ostheim (DE); and Matthias Warmuth, Windshausen (DE)
Assigned to Innomotics GmbH, Nümberg (DE)
Appl. No. 17/785,325
Filed by Innomotics GmbH, Nuremberg (DE)
PCT Filed Sep. 25, 2020, PCT No. PCT/EP2020/076857
§ 371(c)(1), (2) Date Jun. 14, 2022,
PCT Pub. No. WO2021/121696, PCT Pub. Date Jun. 24, 2021.
Claims priority of application No. 19216966 (EP), filed on Dec. 17, 2019.
Prior Publication US 2023/0026832 A1, Jan. 26, 2023
Int. Cl. H02K 15/00 (2006.01); H02K 17/20 (2006.01)
CPC H02K 15/0012 (2013.01) [H02K 17/20 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A conductor bar of a cage rotor of an asynchronous machine, said conductor bar having a longitudinal extension and comprising first and second sections in the longitudinal extension, with the first section having a hardness which is lower than a hardness of the second section and realized through soft annealing, brief inductive heating or heating by a flame so as to enable a compression of the first section of the conductor bar by way of axial pressure after axially joining the conductor bar in a slot of a magnetically conductive body of the cage rotor, with the first section abutting an inner wall of the slot of magnetically conductive body of the cage rotor.