公开(公告)号：US11383853B2

公开(公告)日：2022-07-12

申请号：US16437263

申请日：2019-06-11

Applicant: ROLLS-ROYCE plc

Inventor： Richard Peace ,  Adam Newman

IPC: B64D33/08 ,  B64D27/24 ,  F04D29/58 ,  F04D25/08 ,  B64D33/02

Abstract: An electric propulsion unit (102) for an aircraft is shown. A fan (202) produces a pressured airflow (P) by raising the pressure of an incident airflow (I). An electric machine (201) is arranged to drive the fan and is located within a casing (204). A primary cooling circuit (205) is located within the casing, and includes the electric machine and a first pass of a fluid-fluid heat exchanger (208), thereby placing the electric machine and the fluid-fluid heat exchanger in thermal communication. A secondary cooling circuit includes a second pass of the fluid-fluid heat exchanger and an air-fluid heat exchanger (210) located within the pressurised airflow produced by the fan, thereby placing the fluid-fluid heat exchanger and the air-fluid heat exchanger in thermal communication.