| 摘要 |
PURPOSE:To enable to preferably control a DC motor even if the limit value of a speed regulator output exceeds due to a large alteration in the speed by presuming a load torque by using a state observing unit, thereby suppressing the excess of the current at the abrupt load changing time. CONSTITUTION:When the load torque of a DC electric machine 5 is presumed by a state observing unit 7 and the torque is feed-forwardly compensated with the presumed value to suppress the variations in the speed, a field simulating factor 73 for converting the deviation between the presumed load torque and the torque generated in a motor is converted to a current value, and a product of the factor multiplied by K by a proportional factor 74 is added to the output of a speed regulator as a current command value. Since a damping can be multiplied to a current control element by suitably regulating and selecting the gain K of the factor 74, the excess overshoot of the current can be suppressed in this manner. |
