Patent ID: 7615897
Filing Date: 2009-11-10
Classification: H02K

Abstract:
1. A motor cooling device including an impeller, which is supported by a rotary shaft of a motor, and a fan cover, which encases a front portion and a peripheral portion of the impeller and has an air inlet in a front surface and an air outlet in the rear, the motor cooling device comprising: a constricting flow space arranged at an exit side of the impeller and defined by a motor end surface, which includes an entrance in the proximity of a rear surface of a vane of the impeller and a circumferential surface expanding radially and diagonally in the rearward direction, a space formation member, which is formed on an inner surface of the fan cover, and an annular partition plate, which extends from the air inlet toward the impeller, the annular partition plate having an outer diameter smaller than an outer diameter of the impeller, said annular partition plate having an inwardly extending flange in proximity of a front surface of said vane.