US 12,176,795 B2
Rotary electric machine
Yasushi Hayasaka, Tokyo (JP); and Eiichiro Tokizaki, Tokyo (JP)
Assigned to Hitachi Industrial Products, Ltd., Tokyo (JP)
Appl. No. 17/792,455
Filed by Hitachi Industrial Products, Ltd., Tokyo (JP)
PCT Filed Nov. 6, 2020, PCT No. PCT/JP2020/041541
§ 371(c)(1), (2) Date Jul. 13, 2022,
PCT Pub. No. WO2021/192392, PCT Pub. Date Sep. 30, 2021.
Claims priority of application No. 2020-055565 (JP), filed on Mar. 26, 2020.
Prior Publication US 2023/0022399 A1, Jan. 26, 2023
Int. Cl. H02K 9/06 (2006.01); H02K 5/18 (2006.01)
CPC H02K 9/06 (2013.01) [H02K 5/18 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A rotary electric machine comprising:
a rotor including a shaft;
a stator placed facing the rotor with an air gap therebetween and supported by a stator frame;
bearings which rotatably support the shaft; and
end brackets which hold the bearings,
wherein one of the end brackets includes a heat insulating layer on an inner side or an outer side of the rotary electric machine to prevent heat from flowing into the bearings,
wherein the heat insulating layer includes:
a recess in one of the end brackets where an internal air or an external air flows;
a heat insulating material placed in the recess; and
a cover bolted to the end brackets to seal the heat insulating material,
wherein the heat insulating layer is located, in order to insulate heat that enters one of the end brackets from a divergent internal-air diverged from internal air, on an internal-air side portion of one of the end brackets and in a place where one of the end brackets is exposed to the divergent internal-air from an inner fan, and
wherein the heat insulating layer acts as thermal resistance against heat conducted through the stator frame from the stator.