... of constant voltage; 3.good cost performance Series three(Single) A.C. synchronous generator Verified Information This information is Verified by ... , 15, 20, 24, 30, 40, 50, 64, 75, 90, 100,120, 150, 160, 180, 200, 250, 280, 300, 320, 350, 400 ... , 15, 20, 24, 30, 40, 50, 64, 75, 90, 100,120, 150, 160, 180, 200, 250, 280, 300, 320, 350, 400 ...