| 摘要 |
PURPOSE:To prevent the limitation of a gear from being received by executing the integer number-dividing or non-integer number-dividing of a capstan FG signal, defining an output as a comparing signal, detecting a phase error signal with phase comparison to a reference signal and controlling the phase error signal. CONSTITUTION:An FG signal S1 to be obtained from a capstan (F2) 2 by the rotation of a capstan motor 1 is inputted to a dividing means 4 and a speed comparing means 6. In the means 4, the frequency of the signal S1 is divided by an integer or a noninteger so as to obtain a frequency which is equal to the frequency of a reference signal S2, and a PG signal S3 is prepared. The signal S3 is inputted to a phase comparing means 5 together with the signal S2 and the phase comparison is executed. Then, a phase error signal S4 is detected. On the other hand, the means 6 detects a speed error signal S5 by executing frequency discrimination for the signal S1. Then, the signals S4 and S5 are mixed by a mixing means 7 and a mixed output S6 is obtained. The rotating speed and phase of a motor 1 are controlled by this output S6. Thus, a servo device can be realized not to receive the limitation for the shaft diameter and tooth number of the gear at all. |
