AC generator for vehicles

An AC generator for vehicles including a field rotor;

• a stator having a laminated core with a plurality of slots;
• a plurality of electric conductor segments inserted in the slots;
• an electric insulator disposed around said field rotor;
• and a frame for supporting the rotor and the stator, wherein:
• each of said electric conductor segments is made of aluminum and includes an in-slot portion disposed in one of said slots and a crossover portion for connecting said in-slot portion to another in-slot portion of said conductor segments disposed in another of said slots to provide a winding as a whole,
• said frame is disposed around said crossover portions of the electric conductor segments,
• portions of said frame substantially in an outer diametrical direction opposite to said crossover portions have a plurality of windows substantially in a whole periphery,
• said crossover portions of said conductor segments are spatially parted from one another to form cooling air passages which receive cooling air from an inner periphery of said stator, and
• said rotor comprises a cooling fan on an axial end of said rotor.