| 摘要 |
PURPOSE:To calculate an adequate torque current command and a slip frequency command at abrupt field magnetic flux varying time and to immediately follow up to a torque command by bringing a field command into coincidence with the actual field magnetic flux generated in a motor by the primary delay circuit CONSTITUTION:After an exciting current command i*d is suppressed to the maximum controllable value through a clamper 32, it is newly inputted as an exciting current command i**d to a coordinates converter 20. Further, a magnetic flux to be generated in the actual motor is predicted by the command i**d by the primary delay circuit 31, and the predicted field magnetic flux is used as the torque current command i*q of a torque control system and a field command phi** when calculating a slip frequency command omega*S. Accordingly, when the field magnetic flux abruptly varies,suitable torque current command i*q and slip frequency command omega*S can be calculated, and the motor torque tauimmediately follows up the set torque command tau*. |
