US 12,149,146 B2
Electrical motor with an intrinsic cooling system
Mikael Sundberg, Upplands Väsby (SE); Jonas Genchel, Tyresö (SE); and Ivan Stenius, Tyresö (SE)
Assigned to ZPARQ AB, Stockholm (SE)
Appl. No. 17/640,613
Filed by Zparq AB, Stockholm (SE)
PCT Filed Sep. 14, 2020, PCT No. PCT/SE2020/050857
§ 371(c)(1), (2) Date Mar. 4, 2022,
PCT Pub. No. WO2021/049999, PCT Pub. Date Mar. 18, 2021.
Claims priority of application No. 1951033-8 (SE), filed on Sep. 12, 2019.
Prior Publication US 2022/0345001 A1, Oct. 27, 2022
Int. Cl. H02K 5/20 (2006.01); H02K 5/132 (2006.01)
CPC H02K 5/203 (2021.01) [H02K 5/132 (2013.01)] 7 Claims
OG exemplary drawing
 
1. An electrical motor comprising:
a housing having a stationary internal part and a rotatable external part,
a stator supported by the stationary internal part of said housing, and
a rotor attached to said rotatable external part of said housing said rotor is arranged to rotate freely around the stator, wherein
said rotatable external part has at least one inlet configured to receive a cooling medium, and at least one outlet configured to evacuate said cooling medium,
said stator and said rotor are each separately moulded in respective epoxy layers, and
a channel arranged between said moulded rotor and said moulded stator to conduct said cooling medium in an axial direction of said housing and to be in fluid communication with the at least one inlet and with the at least one outlet, forming an intrinsic cooling system of the electrical motor, wherein the at least one outlet is placed on the rotatable external part of the housing and adapted to discharge the cooling medium from the channel by means of centrifugal force during rotation of the rotor, the at least one outlet being an opening that goes through both the rotating external part of the housing and the rotor and is in fluid communication with the channel.