| 摘要 |
PURPOSE:To suppress the variation of the speed of a motor due to the variation of a load torque to a small value by compensating a feed forward with a load torque calculated by the deviation between a motor current obtained from a current detector and the differentiated value of a speed detector. CONSTITUTION:A speed regulator 1 outputs as a current command value i* a deviation between an actual speed value (n) and a target value n*. A current regulator 2 controls the firing angle of a thyristor converter 3 so that the detected current value (i) becomes equal to a current command value i*. On the other hand, a load torque arithmetic unit 8 simulates an acceleration torque taua by a differentiator 82, simulates the current converted value ia of the acceleration/ deceleration torque taua by a torque current converter 81, obtains a current converted value iL of a load torque by the deviation i-ia to the motor current (i) and adds it to the output of the regulator 1. |
