US 12,255,494 B2
Electric motor with a stator and an axle that can be press-fitted thereto
Jochen Häfner, Blaufelden (DE)
Assigned to ebm-papst Mulfingen GmbH & Co. KG, Mulfingen (DE)
Filed by EBM-PAPST MULFINGEN GMBH & CO. KG, Mulfingen (DE)
Filed on Aug. 5, 2022, as Appl. No. 17/881,717.
Claims priority of application No. 10 2021 120 676.6 (DE), filed on Aug. 9, 2021.
Prior Publication US 2023/0039417 A1, Feb. 9, 2023
Int. Cl. H02K 1/18 (2006.01)
CPC H02K 1/187 (2013.01) 7 Claims
OG exemplary drawing
 
1. An electric motor with a stator and an axle,
the stator has a laminated stator core formed from a multitude of individual teeth that can be arranged in a ring around an axis of rotation of the electric motor and are interconnected in the circumferential direction,
at least some of the individual teeth each have a radially inner pressing portion for elastic and/or plastic deformation and establishment of a press-fit connection between the laminated stator core and the axle, the inner pressing portions extend through the laminated stator core along the axis of rotation and coaxially with the axis of rotation, upon joining of the stator to the axle, the stator can be fixed to the axle through the deformation of the pressing portions and a force acting on the axle as a result of the deformation between laminated stator core and axle,
and the electric motor has at least one securing element, a respective securing element being provided on at least some of the pressing portions and designed to transmit a torque between the axle and the laminated stator core and to fix the position of the laminated stator core relative to the axle in the circumferential direction;
the pressing portions each have a web extending in the radial direction and two lever arms that are connected to the web and protrude oppositely to one another in the circumferential direction relative to the web, each lever arm has a contact surface that points inward in the radial direction for contact with the axle;
two lever arms can be deflected and deformed in the radial direction during the joining process so that a pressing force can be exerted on the axle as a result of the deflection and deformation; and
a respective securing element is provided between the two lever arms.