| 摘要 |
A motor cooling device has an impeller (2) pivotally supported by the rotary shaft (1a) of a motor (1), and a fan cover (4). The fan cover (4) covers the front region and outer peripheral region of the impeller (2) and has an air suction port (5) in the front and an air blow-out port (6) in the rear. The fan cover (4) is provided with a partition member (7) extending from a position more outside than the air suction port (5) to the impeller (2). A cavity (8) is defined between the outer periphery of the partition member (7) and the inner surface of the fan cover (4). The negative pressure due to the cavity effect of eddies produced in the cavity (8) causes the main air current passing through the impeller (2) to be drawn to the front ends of the vanes (3) of the impeller (2), so that aerodynamic characteristics and operation sound characteristics of the impeller (2) are improved. ® KIPO & WIPO 2007
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