US 11,777,360 B2
Electric machine and electrically-assisted turbocharger including the same
Christopher Joel Maurus, Hendersonville, NC (US); Jeffrey Carter, Mirfield (GB); and Tyler Ransom Garrard, Arden, NC (US)
Assigned to BorgWarner Inc., Auburn Hills, MI (US)
Filed by BorgWarner Inc., Auburn Hills, MI (US)
Filed on Oct. 25, 2021, as Appl. No. 17/452,166.
Claims priority of provisional application 63/106,967, filed on Oct. 29, 2020.
Prior Publication US 2022/0140688 A1, May 5, 2022
Int. Cl. H02K 3/52 (2006.01); H02K 1/20 (2006.01); H02K 7/18 (2006.01); H02K 15/00 (2006.01); F04D 17/10 (2006.01); F04D 25/06 (2006.01); F04D 29/043 (2006.01); F04D 29/063 (2006.01)
CPC H02K 3/522 (2013.01) [F04D 17/10 (2013.01); F04D 25/06 (2013.01); F04D 29/043 (2013.01); F04D 29/063 (2013.01); H02K 1/20 (2013.01); H02K 7/1823 (2013.01); H02K 15/0031 (2013.01); H02K 2203/12 (2013.01)] 21 Claims
OG exemplary drawing
 
1. An electrically-assisted turbocharger for delivering compressed air to an internal combustion engine, said electrically-assisted turbocharger comprising;
a shaft extending along an axis between a first shaft end and a second shaft end spaced from said first shaft end along said axis;
a compressor wheel coupled to said first shaft end of said shaft;
a turbine wheel coupled to said second shaft end of said shaft;
a housing disposed about said shaft and defining a housing interior; and
an electric machine disposed about said shaft in said housing interior of said housing, said electric machine comprising;
a rotor extending along said axis and rotatably coupled to said shaft;
a stator lamination stack radially spaced from said rotor such that said rotor is radially disposed between said shaft and said stator lamination stack, with said stator lamination stack having,
a first stator end proximate to said compressor wheel;
a second stator end spaced from said first stator end and proximate to said turbine wheel; and
a plurality of circumferentially spaced teeth extending between said first and second stator ends, with said plurality of circumferentially spaced teeth extending radially with respect to said axis, and with said plurality of circumferentially spaced teeth defining gaps therebetween;
a coil winding disposed in said gaps between said circumferentially spaced teeth of said stator lamination stack; and
a guard plate disposed at one of said first and second stator ends of said stator lamination stack, said guard plate extending radially away from said axis and comprising a plurality of teeth guards extending radially with respect to said axis,
wherein each of said plurality of teeth guards is aligned with one of said plurality of teeth of said stator lamination stack to electrically insulate said coil winding from said plurality of teeth of said stator lamination stack; and
wherein said teeth of said stator lamination stack extend radially inward toward said axis and said teeth guards of said guard plate extend radially inward toward said axis.