Servomechanism Using Traction Drive : Improvement of Servo Accuracy at High-Speed Rotation

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概要

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• The authors attempted to apply traction drive to a constant-speed servomechanism for Numerically Controlled (NC) machines. High-precision servomechanisms require high-resolution encoders to detect rotary position, whereas conventional high-resolution encoders cannot rotate at high speed. There fore, the authors attempted to solve the problem of resolution and maximum rotary speed using a nonsinusoidal-wave quadrature Phase-Locked Loop (PLL). Using this nonsinusoidal-wave quadrature PLL for interpolating the tracking error, a very high-resolution detection of rotary angle at high-speed rotation was achieved even when using inexpensive encoders whose output is nonsinusoidal wave. Traction drive damps the high-frequency torque ripple, but transmits torque ripple of low frequency. Most of the torque ripple of low frequency is due to the eccentricity of rollers. As the rotary speed of rollers becomes high, the torque ripple has a frequency at which it cannot be eliminated either by traction drive or feedback control. Because the mechanism of torque ripple is very complicated, it is difficult to compensate by detecting roller eccentricity. Therefore, the authors used repetitive control to reduce the position error associated with roller rotation, and obtained high-accuracy rotation in the experiments. In this paper, the interpolation method of tracking error using a nonsinusoidal-wave quadrature PLL and the reduction method of tracking error using repetitive control are presented.

• 2001-03-15

著者

• WANG Lei

  Department of Physics and Centre for Computational Science and Engineering, National University of S

• Wang Lirong

  Department Of Mechanical Science And Engineering Tokyo Institute Of Technology

• 王 磊

  Tokyo Inst. Technol. Tokyo Jpn

• EMURA TAKASHI

  Department of Bioengineering and Robotics, Graduate School of Engineering, Tohoku University

• Wang Lei

  Department Of Pathology Fudan University

• Emura Takashi

  Department Of Mechatronics & Precision Engineering Tohoku University

• Emura Takashi

  Department Of Bioengineering And Robotics Graduate School Of Engineering Tohoku University

• Wang Lei

  Department Of Dermatology Xijing Hospital The Fourth Military Medical University

• Wang Lei

  Department Of Cardio-thoracic Surgery Xinhua Hospital School Of Medicine Shanghai Jiaotong Universit

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