AC generator for electric-motor cycle, has rotary force retaining device arranged around axis of shaft and having maximum diameter along radial direction, where ratio of maximum diameter to intake outer diameter is fixed to specified value

摘要

The generator (1) has frames (5, 6) with an intake (52) that is formed around an axis of a rotary shaft (2) in such a manner that the intake is arranged between a rotary force retaining device (10) and a rotor (3) in an axial direction of the shaft and has an outer diameter along a radial direction perpendicular to the axis of the shaft. The retaining device is arranged around the axis of the shaft and has a maximum diameter along the radial direction, where the ratio of the maximum diameter to the outer diameter is fixed less than or equal to 0.85.