電動ドライバーFED II 10K のモータ電流に対するモデュレーション効果

概要

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In case of a high speed model of FED II 10K, there appear some problems in torque curves of fastening screw. Repeated rise and decay of torque in fastening process, and a long decay of torque in a process of keeping torque constant. The period of rise and decay coincides with that of revolution stop of a bit, which suggests a contribution of the friction. Therefore, we thought of modulating motor current of a screw driver for its bit not to stop revolution. The modulation improves above problems well, and the followings were cocluded. 1) The most profitable frequency of the modulation is 250 Hz for our system. 2) Although depending on a setting torque, the optimum modulation amplitude V_<pp> is 4.5 V for the sine wave and 4.0 V for the saw tooth wave in case of fastening M3 screws with a torque of 8.0 kgf・cm. 3) The saw tooth wave is preferable to the sine wave for the modulation.
帝京平成大学の論文
1998-06-30