Patent ID: 7560843

Claim:
A vehicle drive system comprising: a rotating electric machine capable of rotating about an output shaft in a forward direction and in a reverse direction in which torque ripple is smaller than torque ripple in the forward direction; a rotation shaft rotating in a direction to move a vehicle forward according to the rotation of the output shaft in the forward direction; a direct-current power source; an inverter placed on a current feeding and receiving path between the direct-current power source and the rotating electric machine; and a control unit gaining rotation information from the rotating electric machine to control the inverter, wherein the control unit controls the inverter such that torque in the forward direction is produced in a rotor in response to an acceleration instruction to cause the rotating electric machine to run in a power mode, and torque in the reverse direction is produced in the rotor in response to a deceleration instruction to cause the rotating electric machine to run in a regenerative mode.