US 12,456,906 B2
Method for reworking a faulty welded joint of a hairpin winding
Patrick Herrmann, Pfaffenhofen (DE)
Assigned to AUDI AG, Ingolstadt (DE)
Appl. No. 17/925,080
Filed by AUDI AG, Ingolstadt (DE)
PCT Filed May 12, 2021, PCT No. PCT/EP2021/062566
§ 371(c)(1), (2) Date Nov. 14, 2022,
PCT Pub. No. WO2021/249713, PCT Pub. Date Dec. 16, 2021.
Claims priority of application No. 10 2020 115 124.1 (DE), filed on Jun. 8, 2020.
Prior Publication US 2023/0198351 A1, Jun. 22, 2023
Int. Cl. H02K 15/50 (2025.01); B23K 9/16 (2006.01)
CPC H02K 15/50 (2025.01) [B23K 9/16 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A method for reworking a defective welded connection of a hairpin winding for a rotor or stator of an electrical machine, comprising:
providing the hairpin winding applied to a winding support, wherein the hairpin winding has at least one conductor formed from multiple conductor sections, wherein the conductor sections of the respective conductor are welded in pairs at a respective welded connection by a first welding method, wherein at least one of the welded connections is a defective welded connection,
severing the defective welded connection, and
connecting the conductor sections to be welded, which were previously connected by the defective welded connection, by way of a connecting method that differs from the first welding method, in particular by way of a second welding method;
wherein the connection method is used as the connection method which applies additional material to the conductor sections to be welded and/or in that the first welding method is a beam welding method; and
wherein a volume of the additional material is applied by the connection method that is between 50% and 200% or between 80% and 120% of the volume of the cut off area.