| 摘要 |
PURPOSE:To obtain a disturbance which does not cause the variation of a machine system by varying the frequency of a disturbance signal with a signal obtained by detecting a resonance from the speed detection signal of a DC motor. CONSTITUTION:When a command speed is inputted to an arithmetic circuit 20, a current signal corresponding to the command speed is inputted to an adder 21. On the other hand, a disturbance signal of initial frequency is outputted from a disturbance signal generator 26, and the adder 21 applies the signal of adding the current signal and the disturbance signal to a DC motor MT. When the motor MT rotates, a rotating speed signal is generated from a tachometer generator 25, and the circuit 20 produces a deviation from the command speed. A disturbance signal generator 26 extracts the signal components except the speed component from the rotating speed signal, and varies the frequency of the disturbance signal when the intensity of the extracted signal component becomes higher than the prescribed intensity. |
