The motor-integrated fan has a suction port and a blowing port, and includes a rotating part rotatably supported on a shaft part; and a peripheral drive motor that rotates the rotating part by applying motive power from a duct provided on an outer peripheral side of the shaft part. The motor includes: a permanent magnet on a rotation support ring connected to the outer peripheral side of a blade of the rotating part; and a coil facing the permanent magnet in the axial direction of a rotational axis. In a cross-section taken on a plane orthogonal to the circumferential direction of the rotational axis, the center of gravity of a free end side portion including at least one of the rotation support ring and the permanent magnet is positioned closer to the suction port in the axial direction than the center of gravity of the thrust applied to the blade.

A hub assembly for a rotary wing aircraft having a rotor shaft which rotates about a rotational axis includes: a hub extender arm coupled to the rotor shaft; a pitch bearing that is disposed within and connected to the hub extender arm; and a rotor blade assembly having an inboard section disposed within the hub extender arm and connected to the pitch bearing; wherein the hub extender arm has an inboard cross-sectional area where coupled to the rotor shaft that is greater than an outboard cross-sectional area where coupled to the pitch bearing.

A motor-integrated fan 1 including one or more motors integrated therein comprises: a shaft part 11 which serves as a supporting system disposed at the center of a rotational axis; a rotation part 12 which is a rotating system rotating about the shaft part 11; a duct 13 which serves as a supporting system provided on the outer periphery of the shaft part 11; and a motor 14 which rotates the rotation part 12, wherein the rotation part 12 comprises: a plurality of blades 32 rotatably supported at least on the shaft part 11 and rotating thereabout, the blades 32 being arranged in a circumferential direction of the rotational axis I; and a rotation support ring 33 connected on one side of each of the blades 32 in a radial direction of the rotational axis, the rotation support ring 33 supporting the plurality of blades 32.

A motor-integrated fan 1 including one or more motors integrated therein comprises: a shaft part 11 which serves as a supporting system disposed at the center of a rotational axis; a rotation part 12 which is a rotating system rotating about the shaft part 11; a duct 13 which serves as a supporting system provided on the outer periphery of the shaft part 11; and a motor 14 which rotates the rotation part 12, wherein the rotation part 12 comprises: a plurality of blades 32 rotatably supported at least on the shaft part 11 and rotating thereabout, the blades 32 being arranged in a circumferential direction of the rotational axis I; and a rotation support ring 33 connected on one side of each of the blades 32 in a radial direction of the rotational axis, the rotation support ring 33 supporting the plurality of blades 32.

A rotor assembly includes a motor, a propeller, and a connection assembly. The motor includes a stator and a rotator rotatable with respect to the stator. The connection assembly includes a locking member provided between the propeller and the rotator. The locking member is configured to rotate with respect to the rotator and the propeller to lock the propeller to the motor.

A rotor assembly includes a motor, a propeller, and a connection assembly. The motor includes a stator and a rotator rotatable with respect to the stator. The connection assembly includes a locking member provided between the propeller and the rotator. The locking member is configured to rotate with respect to the rotator and the propeller to lock the propeller to the motor.

A rotor assembly configured to increase the stiffness of a rotor mast. The rotor assembly includes the rotor mast, a rotor hub, a mast nut, a mast bearing, and a cuff disposed between the mast nut and the mast bearing. The cuff is captured and compressed between the mast nut and the inner race of the mast bearing along an uninterrupted load path that extends between the mast nut and the mast bearing.

A rotor assembly configured to increase the stiffness of a rotor mast. The rotor assembly includes the rotor mast, a rotor hub, a mast nut, a mast bearing, and a cuff disposed between the mast nut and the mast bearing. The cuff is captured and compressed between the mast nut and the inner race of the mast bearing along an uninterrupted load path that extends between the mast nut and the mast bearing.

An electric propulsion system for an aircraft includes a nacelle and an electric machine. The electric machine includes a stator positioned in the nacelle, and a rotor and fan assembly positioned in a primary flow path through the nacelle. The rotor and fan assembly includes a cylindrical fan shroud, a plurality of rotor magnets positioned on an outer surface of the fan shroud, and a fan hub mounted on a central support shaft via one or more bearings. A plurality of fan blades extend between an inner surface of the fan shroud and an outer surface of the fan hub. The rotor magnets may be loaded in compression in a radial direction when the rotor and fan assembly is at rest. The fan blades may be pre-stressed in a radial direction when the rotor and fan assembly is at rest.

A hub assembly for a rotary wing aircraft having a rotor shaft which rotates about a rotational axis includes: a hub extender arm coupled to the rotor shaft; a pitch bearing that is disposed within and connected to the hub extender arm; and a rotor blade assembly having an inboard section disposed within the hub extender arm and connected to the pitch bearing; wherein the hub extender arm has an inboard cross-sectional area where coupled to the rotor shaft that is greater than an outboard cross-sectional area where coupled to the pitch bearing.