US 12,451,783 B2
Direct-current electric motor and use thereof as a drive of a liftgate
Florian Höfer, Neuwied (DE); Marian Bochen, Eitelborn (DE); and Axel Knopp, Eitelborn (DE)
Assigned to STABILUS GMBH, Koblenz (DE)
Appl. No. 18/035,335
Filed by STABILUS GMBH, Koblenz (DE)
PCT Filed Nov. 11, 2021, PCT No. PCT/EP2021/081407
§ 371(c)(1), (2) Date May 4, 2023,
PCT Pub. No. WO2022/101354, PCT Pub. Date May 19, 2022.
Claims priority of application No. 10 2020 130 006.9 (DE), filed on Nov. 13, 2020.
Prior Publication US 2024/0014723 A1, Jan. 11, 2024
Int. Cl. H02K 23/42 (2006.01); H02K 23/40 (2006.01); H02K 23/68 (2006.01); H02K 26/00 (2006.01)
CPC H02K 23/40 (2013.01) [H02K 26/00 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A use of a DC electric motor as a drive for driving a tailgate of a vehicle, the DC electric motor comprising a rotor and a stator, the rotor being mounted for rotation relative to the stator about an axis of rotation,
wherein the rotor comprises a magnetic asymmetry means for generating an asymmetric magnetic interaction between the rotor and the stator,
wherein the rotor and the stator are configured to assume first positions and second positions relative to each other, wherein a higher holding torque acts between the rotor and the stator in one of the first positions than in one of the second positions due to the magnetic asymmetry means,
wherein the rotor comprises a plurality of rotor poles,
wherein the rotor comprises a plurality of pole pieces extending from each of the plurality of rotor poles on one side or on two sides in a direction of rotation of the rotor, and
wherein the magnetic asymmetry means is embodied by at least one of the plurality of pole pieces being shaped asymmetrically to an axis of symmetry of the rotor pole carrying the at least one pole piece,
the DC electric motor and the magnetic asymmetry means being designed in such a way that the holding torque of the DC electric motor is greater than or equal to the torque which the tailgate generates by its own weight on the drive.