Disclosed is an SR (switched reluctance) generator with improved generation capability in a low-speed range. The SR generator is configured such that an inductance of a phase winding wound around a stator is increased in a low-speed range and is reduced in a high-speed range. Accordingly, a variation rate of the inductance relative to a phase angle is increased in a low-speed range, resulting in an increased output energy in a low-speed range and an improved generation efficiency. The phase winding of the stator may be configured to have a single phase. Accordingly, since the generator is configured with the reduced number of switches, it can be manufactured inexpensively and simply.