Patent ID: 8573954
Filing Date: 2013-11-05
Classification: F04D,F25D

Abstract:
1. A fan assembly comprising: a shaft; a fan having a hub to rotate around the shaft; a permanent magnet to rotate with the fan around the shaft; a stator disposed in opposing relation to the permanent magnet; and a blocker having a recess opposing the permanent magnet, wherein: the permanent magnet rotates around the shaft in a clearance formed by the recess in the blocker, the hub includes a first surface and a second surface, the first surface of the hub is coupled to the second surface and is located between the second surface and the shaft, the second surface of the hub is coupled to a blade of the fan, and wherein the fan assembly further comprises: a printed circuit board to control operation of the fan and being disposed at an open side of the hub; and a molding section to allow the printed circuit board to be integrally coupled to an end portion of the stator, the molding section substantially covering the printed circuit board and the end portion of the stator such that the printed circuit board can be waterproof, wherein the first surface of the hub is formed to be cylindrical by protruding parallel with the shaft to extend in a circumferential direction of the hub, wherein the permanent magnet is attached onto a radially inner side of the first surface of the hub, and wherein the second surface of the hub slants in a direction away from the shaft, and wherein the blocker and the first surface of the hub are separated by a first distance, and the blocker and the slanted second surface of the hub coupled to the fan blade are separated by a second distance greater than the first distance.