Provided are a switched reluctance machine having an inner-rotor and outer-stator configuration, an electric vehicle, and a switched reluctance machine system, relating to the technical field of electric motors. The switched reluctance machine comprises a housing and inner rotor (220) and outer stator (210) disposed in the housing; the outer stator (210) comprises a plurality of stator teeth arranged at intervals in the circumferential direction and a stator groove located between the stator teeth; the ratio of the groove width (L2) of the outer stator to the width (L1) of the stator teeth is 1 to 1.25. The switched reluctance machine has the advantages of large torque, good low-speed performance, wide platform efficiency, high power density, low noise, good environmental adaptability, high reliability, long service life, a simple production process, and low costs. The invention may be widely used in electric vehicles.