ELECTROMOTIVE DRIVE DEVICE USED IN ENGINE-DRIVEN VEHICLE

An electromotive drive device including a small motor and a small-capacity battery more effectively improves the fuel economy of an engine-driven vehicle. An electromotive drive device (10) includes: a motor (11) for driving a vehicle (1); a battery (12) storing electrical energy to rotate the motor (11); an inverter (13); a converting mechanism (14) transmitting rotation of the motor (11) to a drive shaft (2) at a predetermined conversion ratio independently of a conversion ratio at which an engine is driven; and a control unit (15) controlling an operation of the inverter (11). The control unit (15) is configured so that upper vehicle speed limits, to which the motor (11) is allowed to operate, can be set separately during powering and during regeneration, respectively.