US 12,255,496 B2
Joining a laminated core to a shaft
Klaus Büttner, Hollstadt (DE); Klaus Kirchner, Ostheim (DE); and Matthias Warmuth, Windshausen (DE)
Assigned to Siemens Aktiengesellschaft, Munich (DE)
Appl. No. 17/421,635
Filed by Innomotics GmbH, Nuremberg (DE)
PCT Filed Dec. 16, 2019, PCT No. PCT/EP2019/085320
§ 371(c)(1), (2) Date Jul. 8, 2021,
PCT Pub. No. WO2020/148048, PCT Pub. Date Jul. 23, 2020.
Claims priority of application No. 19152433 (EP), filed on Jan. 18, 2019.
Prior Publication US 2022/0077737 A1, Mar. 10, 2022
Int. Cl. H02K 1/28 (2006.01); H02K 7/00 (2006.01); H02K 15/02 (2006.01); H02K 15/028 (2025.01)
CPC H02K 1/28 (2013.01) [H02K 7/003 (2013.01); H02K 15/028 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A lamination of a rotor of a rotary dynamo-electric machine, said lamination comprising:
a shaft bore for receiving a shaft, said shaft bore defined by a first radius; and
at least two pull-through grooves, each of the pull-through grooves having a lamination tongue having a conical configuration with a non-zero cone angle and facing radially inwards towards an axis such that a radially-inwardly facing end of the lamination tongue defines a second radius which is smaller than the first radius so as to achieve a form-fit with the shaft to effect an anti-rotation protection and axial safety against slippage on the shaft, each of the pull-through grooves formed on the shaft bore by two pitch circles which are defined by a third radius and configured to transition each at a predeterminable transition point from the third radius into a straight line, with the straight lines intersecting at the end of the lamination tongue and enclosing the conical lamination tongue,
wherein a location of the predeterminable transition point from the third radius into the straight line is selected to adjust the non-zero angle and the bending stiffness of the lamination tongue in order to provide form-fit score marks on a radially outward facing surface of the shaft.