Patent ID: 6798091
Filing Date: 2004-09-28
Classification: H02K,Y10T

Abstract:
A watertight brushless fan motor comprising:a stator provided with a plurality of stator magnetic poles, each of which has a winding wound around each of a plurality of projecting pole portions of an iron core constituted by a plurality of laminated steel plates; a circuit substrate mounted with electronic components constituting a control circuit for controlling a current flow through the winding, the circuit substrate being fixed to the stator, spaced from the projecting pole portions at a predetermined distance; a rotor including a plurality of rotor magnetic poles, each of which is made of a permanent magnet, on an inner peripheral side thereof and including a plurality of blades on an outer peripheral side thereof; a case including a bearing supporting cylindrical section in which a bearing for rotatably supporting a rotary shaft of the rotor is received, a cylindrical housing section for surrounding an outer periphery of the blades of the rotor, a plate-like section extending from an end of the bearing supporting cylindrical section in a direction perpendicular to a center line of the bearing supporting cylindrical section, spaced from the circuit substrate at a predetermined distance, and a plurality of webs for connecting the plate-like section to the housing section; one or more pads disposed in at least one of a first space between the stator and the circuit substrate and a second space between the circuit substrate and the plate-like section of the case, and made or an electrical insulating material, for occupying a main portion of one of these spaces or both; and a molded part made of an insulating resin in such a manner that the stator, the circuit substrate, and the one or more pads are included therein.