| 摘要 |
PURPOSE:To sufficiently cool a motor, by a method wherein an opening part is formed in the boss part of a conical trapezoidal hub, and an auxiliary vane, having a positive angle of attack with a rotation direction and protruded toward the inside of the hub, is provided. CONSTITUTION:An opening part 1b and an auxiliary vane 1c are attached to the upper bottom of a conical trapezoidal hub 1a, and a motor 2 is situated to the interior of the hub 1a. A flow, blown out from a central part to surrounding, is produced through rotation of an impeller 1, a part of a flow incoming from a portion in the vicinity of the central part of a suction port is prevented from flowing around the outside of the hub 1a, the auxiliary vane 1c works as an axial flow impeller, and more air is fed in the hub 1a. This constitution enables sufficient cooling of the motor.
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