Patent ID: 7863783
Filing Date: 2011-01-04
Classification: H02K

Abstract:
1. A brushless alternating current generator for vehicles, comprising: a stator shaped to have an inner circumferential surface and provided with a stator winding; a rotor disposed in the inner bore of the stator to face the inner circumferential of the stator, the rotor having a rotary shaft providing an axial direction along the rotary shaft; a field winding that generates magnetic flux to the rotor; a rectifier having a plurality of rectifying elements to rectify a voltage from the stator winding and output the rectified voltage, and a radiating fin to which the rectifying elements are attached; a housing that has a side wall and houses both the stator and the rotor and has an end face to which electric parts including the rectifier are attached, the side wall being along the axial direction, the end face being along a radial direction perpendicular to the axial direction, and both the side wall and the radiating fin being mutually adjacent to provide a gap therebetween in the radial direction; a cover that encloses the end face of the housing and has a plurality of air inlets that takes cooling air into an inside of the cover; and an extension member that is secured to the cover and that extends into the gap in the axial direction to provide a distance of 1.5 mm or less between the extension member and the radiating fin.