US 11,811,283 B2
Electric machines
David F. Brookes, Derby (GB)
Assigned to ROLLS-ROYCE PLC, London (GB)
Filed by ROLLS-ROYCE plc, London (GB)
Filed on Aug. 31, 2020, as Appl. No. 17/007,338.
Claims priority of application No. 1913083 (GB), filed on Sep. 11, 2019.
Prior Publication US 2021/0075284 A1, Mar. 11, 2021
Int. Cl. H02K 3/28 (2006.01); H02K 1/16 (2006.01); H02K 3/14 (2006.01); H02K 3/24 (2006.01); H02K 3/42 (2006.01); H02K 3/493 (2006.01); H02K 15/00 (2006.01); H02K 15/02 (2006.01); H02K 15/085 (2006.01); H02K 15/12 (2006.01); H02K 21/14 (2006.01); H02K 7/18 (2006.01); H02K 9/197 (2006.01)
CPC H02K 3/28 (2013.01) [H02K 1/165 (2013.01); H02K 3/14 (2013.01); H02K 3/24 (2013.01); H02K 3/42 (2013.01); H02K 3/493 (2013.01); H02K 7/1823 (2013.01); H02K 9/197 (2013.01); H02K 15/0018 (2013.01); H02K 15/024 (2013.01); H02K 15/085 (2013.01); H02K 15/12 (2013.01); H02K 21/14 (2013.01); H02K 2213/06 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A stator for a radial-flux rotary electric machine, comprising:
a yoke with a plurality of teeth, each tooth extending from a root at the yoke to a tip, a width of each tooth at the root being greater than or equal to a width at the tip thereof to define open slots therebetween;
a plurality of coils, each one of which being located on a respective one of the plurality of teeth, the plurality of coils being sized such that a slot fill factor is between zero and unity to define axial voids in the slots;
a plurality of magnetic sealing members, each one of which being engaged with the tips of adjacent teeth to circumferentially and axially seal the axial voids in the slots for retaining an axial flow of coolant therein, the plurality of magnetic sealing members being composed of a magnetic material to provide a flux path between adjacent tooth tips to increase an amount of leakage flux, wherein each slot is defined by a wound tooth carrying a coil and an unwound tooth not carrying a coil, the axial voids in the slots are triangular and are provided between each one of the plurality of coils and an adjacent unwound tooth.