Abstract: An axial fan assembly includes blades rotatable about a central axis, a hub connecting the blades at radially-inner ends thereof, and a motor connected to a first portion of the hub. A second portion of the hub supporting the plurality of blades is isolated from the first portion of the hub by a plurality of slots. A plurality of ribs interconnect the first and second hub portions, the ribs defining unsupported regions along bordering ones of the slots. Inner and outer attachment portions of the ribs extend radially inward and radially outward, respectively, from the unsupported regions to attach with the first and second hub portions. As viewed along the central axis, a first thickness defined at each of the unsupported rib portions is less than a second thickness defined at one of the inner and outer attachment portions.

Abstract: An axial fan assembly includes blades rotatable about a central axis, a hub connecting the blades at radially-inner ends thereof, and a motor connected to a first portion of the hub. A second portion of the hub supporting the plurality of blades is isolated from the first portion of the hub by a plurality of slots. A plurality of ribs interconnect the first and second hub portions, the ribs defining unsupported regions along bordering ones of the slots. Inner and outer attachment portions of the ribs extend radially inward and radially outward, respectively, from the unsupported regions to attach with the first and second hub portions. As viewed along the central axis, a first thickness defined at each of the unsupported rib portions is less than a second thickness defined at one of the inner and outer attachment portions.

Abstract: A motor housing includes a motor support portion defining a central axis and including a first end and a second end, a wall surrounding the motor support portion, a surface offset from the wall toward the second end in a direction parallel with the central axis, a cooling air passageway oriented generally parallel with the central axis and offset from the central axis, and an inlet, opening directly into the cooling air passageway, at least partially defined between the wall and the surface. The inlet is configured to permit entry of a tangential airflow into the cooling air passageway, and the inlet is configured to permit entry of a radial airflow into the cooling air passageway.

Abstract: A motor housing includes a motor support portion defining a central axis and including a first end and a second end, a wall surrounding the motor support portion, a surface offset from the wall toward the second end in a direction parallel with the central axis, a cooling air passageway oriented generally parallel with the central axis and offset from the central axis, and an inlet, opening directly into the cooling air passageway, at least partially defined between the wall and the surface. The inlet is configured to permit entry of a tangential airflow into the cooling air passageway, and the inlet is configured to permit entry of a radial airflow into the cooling air passageway.

Abstract: An open-hub centrifugal blower includes a hub rotatable about an axis, an outer rim concentric with the hub, a plurality of blades coupled to the outer rim, a plurality of spokes interconnecting the hub and the outer rim, and a cooling rib extending from at least one of the spokes.