US 12,451,745 B2
Electric machine slot liner with enhanced varnish control
Akash Changarankumarath Pradeepkumar, Westland, MI (US); and Singar Rathnam, Farmington Hills, MI (US)
Assigned to Ford Global Technologies, LLC, Dearborn, MI (US)
Filed by FORD GLOBAL TECHNOLOGIES, LLC, Dearborn, MI (US)
Filed on Jun. 6, 2023, as Appl. No. 18/329,924.
Prior Publication US 2024/0413693 A1, Dec. 12, 2024
Int. Cl. H02K 3/34 (2006.01)
CPC H02K 3/345 (2013.01) 20 Claims
OG exemplary drawing
 
1. An electric machine comprising:
a stator core having an outer circumferential surface, an inner circumferential surface, and longitudinal slots recessed into the inner circumferential surface, each of the slots including first and second radial walls, an outboard circumferential wall extending between the radial walls, an entrance portion having opposing first and second angled walls extending divergently away from the inner circumferential surface, a first shoulder connecting the first radial wall to the first angled wall, and a second shoulder connecting the second radial wall to the second angled wall;
windings disposed in the slots; and
slot liners disposed in the slots such that the windings are disposed in an interior of the slot liners, at least one of the slot liners having first and second flaps angled towards each other from opposing sidewalls of the slot liner, wherein the first and second flaps cooperate to define an inner varnish dam, and the first flap, the second flap, and the corresponding one of the slots cooperate to define an outer varnish dam.