An impeller is provided, including a metal housing, a shaft, and a plastic member. The metal housing has a shaft mounting hole. The inner surface of the shaft mounting hole includes three or more contact points, and the contact points are closer to the shaft than other portions of the inner surface of the shaft mounting hole. The shaft passes through the shaft mounting hole and is affixed by the contact points. The metal housing divides the shaft into an upper section, a middle section, and a lower section. The plastic member passes through the shaft mounting hole and is in contact with the middle section.

An unducted single fan engine includes a housing having one or more fan blades coupled to the housing and configured to rotate circumferentially. The engine has one or more outlet guide vanes coupled to the housing. Each of the one or more guide vanes has a leading edge portion having a variable leading edge. The engine has one or more actuation devices coupled to each of the one or more outlet guide vanes. The one or more actuation devices are configured to control the variable leading edge of the respective outlet guide vane. The variable leading edge is controllable to vary the pitch, camber, lean angle, or sweep of the respective outlet guide vane.

A fan blade apparatus for use in a high-volume, low-speed fan wherein the fan blade includes a body portion, a leading edge portion and a trailing portion. The fan blade coupled to an electric motor configured to rotate in an intended direction wherein the leading portion of the fan blade is at the forefront of the rotation of the blade. The leading edge portion of the fan blade includes a series of steps extending along the length of the leading edge. The stepped configuration creates turbulent air flow when the electric motor rotates in the intended direction.

According to an embodiment, a fan unit holding mechanism includes an installation bracket with a slot, a projection portion on the bracket, and an elastic member at a bottom of the slot. The installation bracket receives a fan unit within the slot. The projection portion is inserted into an attachment hole of the fan unit when the installation bracket receives the fan unit. The elastic member comes into contact with the fan unit and presses against the fan unit.

A drive system includes a planetary gear set having first and second rotatable input members connected in driven relation with respective first and second power sources, and a rotatable output member connected in driving relation with a working piece, the first and second rotatable input members being connected in differentially rotatable communication with the output member. The input members are operable to vary the rotation and direction of the output member and the connected working piece. In an aspect, the output member is rotatable about an axis for driving the working piece, and the first and second input members are also rotatable about the axis. In a further aspect, the first and second input members include coupling regions for coupling the first and second power sources on-axis with the drive system. In a further aspect, the second power source is a hydraulic input motor concentric with the first input member.

An airfoil arrangement for a gas turbine engine may include a clearance device using a shape memory alloy movable to provide clearance between an airfoil and one or more other components of the gas turbine engine. The clearance device may be formed as part of a fan blade. The arrangement may be configured to reduce overall weight and dimensions of the gas turbine engine.

A micro fan is provided. The micro fan includes a rotor and a stator. The stator includes a plurality of axial induced coil units and a circuit board. The axial induced coil units are respectively preformed as a plurality of stator magnetic pole units, and are coupled to the circuit board. At least one of the coil units includes a coil and insulation material. The insulation material is block-shaped and covers at least a portion of the coil, and the central axis of the coil is parallel to the shaft of the rotor.

A compressor comprising: a stator assembly comprising a plurality of stator elements; a rotor assembly comprising a shaft to which is mounted at least one bearing, a permanent magnet and an impeller; a support body; and an outer can comprising an air inlet. The support body comprises a hollow elongate central part to which is mounted the at least one bearing, and inside which the magnet is positioned, the elongate central part comprising a plurality of openings, and the air inlet of the outer can is axially aligned at least partially with the plurality of openings in the elongate central part.

A blower device includes a pair of fans, a housing, and a lid. The pair of fans generates an airflow on one side in the axial direction along the central axis and is coaxially arranged. The housing has a tubular shape extending along the central axis, accommodates the pair of fans, and has two end surfaces opened in the axial direction. The lids cover axial end surfaces of the housing and provide ventilation. The lid includes an annular portion in contact with the inner peripheral surface of the housing and including a through hole penetrating in the radial direction. The housing includes an engagement protrusion that protrudes radially inward from the inner peripheral surface and engages with the periphery of the through hole.

A stator assembly includes a stator that opposes a rotor, which rotates about a central axis extending vertically, in a radial direction, a cover that accommodates an axially upper portion of the stator, a base portion that covers at least an axially lower side of the stator, and a circuit board that opposes the base portion in an axial direction and includes a sensor. At least one of the cover and the base portion includes a positioning portion, which is adjacent to the circuit board in the axial direction, the positioning portion being adjacent to the sensor.