| 摘要 |
PURPOSE:To differentially drive a drive wheel with a current corresponding to a load torque as a control factor. CONSTITUTION:A gross current I0 to be supplied from an inverter 7 to an induction motor is controlled to be a constant value. When a rotating speed of the motor 3, is lowered due to an increase in a load torque in the case of changing a direction of a motor vehicle, a slip S3 increases, and hence a torque current I3 increases. An exciting current Im is decreased, and hence the slip S3 is further increased, and a rotating speed of the motor 3 is further lowered. On the other hand, a slip S4 of an induction motor 4 is decreased due to a decrease in a torque current I4, and its rotating speed is raised. Then, drive wheels 1, 2 are respectively coupled to the motors 3, 4 to be driven, and differential drive function for automatically generating a speed difference in response to a difference of the load torques is electrically realized at the drive wheels, and hence the vehicle can be easily changed in its advancing direction. |
