US 11,677,283 B2
Electric machine having vibration attenuating stator laminations
Christopher Wolf, Ann Arbor, MI (US); Franco Leonardi, Dearborn Heights, MI (US); and Michael W. Degner, Novi, MI (US)
Assigned to FORD GLOBAL TECHNOLOGIES, LLC, Dearborn, MI (US)
Filed by Ford Global Technologies, LLC, Dearborn, MI (US)
Filed on Aug. 4, 2020, as Appl. No. 16/984,897.
Prior Publication US 2022/0045560 A1, Feb. 10, 2022
Int. Cl. H02K 1/18 (2006.01); H02K 5/24 (2006.01)
CPC H02K 1/185 (2013.01) [H02K 5/24 (2013.01)] 16 Claims
OG exemplary drawing
 
1. An electric machine comprising:
a stator formed from a plurality of stacked laminations and defining a center bore; and
a rotor disposed within the center bore and configured to output a rotational torque in response to an input current delivered to the stator, wherein at least one of the stacked laminations of the stator includes a pattern of perforations disposed at a yoke portion of the stator to attenuate structure-bore transmission of vibration during operation of the electric machine, wherein the pattern of perforations comprises multiple groups of perforations arranged circumferentially about the rotor and wherein each of the groups of perforations outline a discrete rectangle, triangle, circle, or ellipse spaced away from other of the groups.