Electric drive vehicles

Abstract

During traveling of an electric drive vehicle (100), if a quantity of regenerative power generated by a synchronous motor generator (40) is greater than a first predetermined value, a slip frequency S of an induction motor generator (50) is changed while maintaining a torque output of the induction motor generator (50), thereby increasing power consumption by the induction motor generator 50. With this structure, it is possible to effectively protect electric devices when excessive power regeneration occurs.