| 摘要 |
PURPOSE:To suppress the torque ripple of high frequency over servo band by accessing the data to offset the torque ripple from a torque control data storage means according to the rotational angle of the rotational angle detector provided on the shaft of a supply reel, and changing over the gain of a motor drive. CONSTITUTION:This servo tension device has a rotational angle detection means 7 and a torque control data storage means 8. The torque control data storage means 8 stores the torque control data for offsetting the torque ripple where the rotational angle theta of a motor is a parameter. The torque control data, which are accessed from the torque control data storage means 8 by the rotational angle detection means 7, change over the gain of motor driving controls 6. Therefore, the torque ripple of high frequency is suppressed. Furthermore, since the rotational angle occurs electrically to the reference signal of rotation by a rotational angle generator 9, the rotational angle detector 6 can be made simple in structure, and miniaturized. |
