Abstract: A rectifier in an alternating current generator for automotive vehicles is disclosed, which comprises a pair of conductive radiators for positive and negative sides, each having embedded therein diode chips arranged in a juxtaposed fashion, an insulated substrate facing the radiators and equipped with a terminal board to be connected with each of lead wires from corresponding diode chips, and cooling fins provided on each of the raidators, and a cooling fan provided on a rotor core for cooling the rectifier, the rectifier being positioned in air course in which air for cooling the radiators is introduced into the inside of the generator from the outside of a case bracket of the generator through air intake ports by the action of cooling fan such that radiators are placed in the radial direction in parallel relation to each other in the air course so that the insulating substrate is placed downstream in the air course.

Abstract: A vehicle generator is arranged so as to avoid battery overcharging and damage to electronic components caused by short-circuiting of the rotor coil. The rotor coil is wound around the coil bobbin such that the initial winding end of the rotor coil is connected with the regulator, while the final winding end of the rotor coil is connected directly with the battery. Tie parts formed on the edge of the coil bobbin and lug ends formed on the slip ring assembly are correspondingly distinguishably formed, to ensure proper connection of the initial and final winding ends of the rotor coil.