<；P>；PROBLEM TO BE SOLVED: To solve the following problem of work vehicles such as lawn mowers: when an axle drive device is equipped with multiple motor generators, the axle structure is complicated and assemblability and the like are degraded； and when a traveling load is large, proper traveling performance cannot be obtained because of torque deficiency at the start in a high-torque, low-revolution range. <；P>；SOLUTION: A motor generator includes a first motor generator 24 and a second motor generator 25, and the first motor generator 24 and the second motor generator 25 include a single common rotor shaft 41. With respect to the rotors 24b, 25b on the common rotor shaft 41, the first stator 24a of the first motor generator 24 and the second stator 25a of the second motor generator 25 are disposed facing each other so that they can be independently controlled by a controller 20. In torque control in the motor generator, an output torque T obtained by adding a torque from the second motor generator 25 to a torque from the first motor generator 24 can be varied according to the magnitude of the traveling load L by changing the operating condition of the second stator 25a. <；P>；COPYRIGHT: (C)2010,JPO&INPIT
