| 摘要 |
PURPOSE:To obtain a motor drive apparatus which controls the drive of AC servomotors on respective axles for a plurality of wheels. CONSTITUTION:A servo amplifier part 9 feedback-controls every AC motor 18 according to an instruction value Va to the AC motor 18 installed on an axle. At this time, the instruction value Va is corrected by the deviation of the mean value of torques of a plurality of axles from the torque of every axle. Then, the AC motor is controlled by the corrected instruction value. In addition, a current supplied to the AC motor is detected by a CT sensor 25, and the torque Ta of the axle is detected. Then, in a differential amplifier 27, the torque difference value DELTATa between the mean value of the torques of a plurality of axles (a), (b) and the torque of the axle (a) is output. Then, the torque difference value DELTAT8 is subtracted from the instruction value Va by using a subtracter 10, and the instruction value Va is corrected. |
