US 12,456,893 B2
Electric motor with unvarnished end winding for stator
Mohammad Mahmoudi, Fremont, CA (US); Emad Dlala, Pleasanton, CA (US); Anandakumar Subbiah, Newark, CA (US); and Sahil Rahimi, Union City, CA (US)
Assigned to Atieva, Inc., Newark, CA (US)
Filed by Atieva, Inc., Newark, CA (US)
Filed on Aug. 28, 2023, as Appl. No. 18/456,876.
Claims priority of provisional application 63/373,837, filed on Aug. 29, 2022.
Prior Publication US 2024/0072590 A1, Feb. 29, 2024
Int. Cl. H02K 3/12 (2006.01); H02K 1/16 (2006.01); H02K 3/30 (2006.01); H02K 9/19 (2006.01)
CPC H02K 3/12 (2013.01) [H02K 1/16 (2013.01); H02K 3/30 (2013.01); H02K 9/19 (2013.01)] 15 Claims
OG exemplary drawing
 
1. An electric motor comprising:
a rotor;
a stator comprising a stack of laminations, wherein windings of the stator comprise wires that have individual insulation, the wires forming slot windings positioned in slots of the stator, the wires further forming end windings positioned outside the slots at each end of the stator;
varnish in the slots of the stator, the varnish contacting the laminations and the slot windings, and wherein the varnish does not contact the end windings of at least one of the ends of the stator; and
a cooling system to apply liquid coolant to at least the end windings, wherein the liquid coolant passes between the wires of the end windings.