An aircraft propulsion system (101) comprises a propulsor (108) an electric motor (110) coupled to the propulsor. The electric motor comprises a surface mounted permanent magnet electric machine comprising a rotor (119) mounted radially inward of a stator (115). A Motor Diameter Ratio (MDR) is defined as an inner diameter (Dstator,in) of the motor stator in metres divided by an outer diameter (Dstator,out) of the motor stator in metres. The MDR of the electric motor stator is within 10% of the value given by the equation: MDR=0.83×TorqueLactive×1Ufan,tip0.08 where:T is the maximum torque rating of the electric motor in kilonewton metres;Lactive is the active length of the motor stator in metres; andUtip is the tip speed of the propulsor at the maximum rated torque of the electric motor in metres per second.In the described embodiments, the MDR is less than 1.
AIRCRAFT PROPULSION SYSTEM
FLUGZEUGANTRIEBSSYSTEM
SYSTÈME DE PROPULSION D'AVION
2023-08-02
Patent
Electronic Resource
English