Abstract: In an example, a rotor for an electric motor includes an inner hub, an outer rim, and a plurality of slats. Each slat of the plurality of slats has a first end at the inner hub and a second end at the outer rim. The rotor is configured to drive a plurality of propeller blades that provide force for an aerial vehicle. Additionally or alternatively, a rotor for an electric motor includes a housing that includes a first retaining structure and a second retaining structure that are configured to apply a force that is directed radially outward against a magnet to hold the magnet against the housing. The rotor is configured to drive a plurality of propeller blades that provide force for an aerial vehicle.

Abstract: An electric propulsion system includes a first stator segment including first teeth and first coils wound around the first teeth and a second stator segment including second teeth and second coils wound around the second teeth. A gap exists in an azimuthal direction between the first stator segment and the second stator segment. The electric propulsion system also includes a rotor frame and rotor magnets. The rotor magnets are attached to the rotor frame and configured to rotate the rotor frame in the azimuthal direction in response to the first coils or the second coils being provided current. The electric propulsion system also includes a propeller including a first blade attached to the rotor frame at a first distal end of the first blade and a second blade attached to the rotor frame at a second distal end of the second blade.

Abstract: A battery cooling system is described, including a thermally conductive cooling plate having a first surface and a second surface opposite the first surface. A first group of battery cells may be disposed on the first surface of the cooling plate, a second group of battery cells may be disposed on the second surface of the cooling plate, and a thermally conductive interstitial layer may be coupled between the cooling plate and the first group of battery cells, and between the cooling plate and the second group of battery cells. The cooling plate is configured to draw heat from the first group and the second group of the battery cells.

Abstract: In an example, a rotor for an electric motor includes an inner hub, an outer rim, and a plurality of slats. Each slat of the plurality of slats has a first end at the inner hub and a second end at the outer rim. The rotor is configured to drive a plurality of propeller blades that provide force for an aerial vehicle. Additionally or alternatively, a rotor for an electric motor includes a housing that includes a first retaining structure and a second retaining structure that are configured to apply a force that is directed radially outward against a magnet to hold the magnet against the housing. The rotor is configured to drive a plurality of propeller blades that provide force for an aerial vehicle.

Abstract: A battery cooling system is described, including a thermally conductive cooling plate having a first surface and a second surface opposite the first surface. A first group of battery cells may be disposed on the first surface of the cooling plate, a second group of battery cells may be disposed on the second surface of the cooling plate, and a thermally conductive interstitial layer may be coupled between the cooling plate and the first group of battery cells, and between the cooling plate and the second group of battery cells. The cooling plate is configured to draw heat from the first group and the second group of the battery cells.

Abstract: The disclosed system provides heat and/or moisture transfer between two counter-flowing air streams. The system comprises: a frame; a transfer wheel having a periphery spaced from the frame so as to form a gap therebetween, and including a transfer matrix mounted and rotationally secured relative to the frame so that the wheel can simultaneously rotate through the two separate, counter-flowing air streams; a sealing arrangement configured so as to seal the transfer wheel to the frame so that as the wheel rotates through the two separate counter-flowing air streams, the two air streams flow through the transfer matrix while remaining sealed from one another; and an electromagnetic actuator including rotational components secured relative to the wheel configured to generate flux across the gap and stationary components secured relative to the frame configured to impart a tractive force to the rotational components in response to polyphase power supplied to the stationary components.