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Note: high precision angle generator using multiple ultrasonic motors and a self-calibratable encoder.

Jong-Ahn Kim1, Jae Wan Kim, Chu-Shik Kang

  • 1Center for Length, Korea Research Institute of Standards and Science, 267 Gajeong-ro, Yuseong-gu, Daejeon 305-340, South Korea.

The Review of Scientific Instruments
|December 2, 2011
PubMed
Summary
This summary is machine-generated.

This study introduces a high-resolution angle generator using ultrasonic motors and a self-calibratable encoder. It achieves precise angular motion with minimal uncertainty, advancing precision measurement technology.

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Area of Science:

  • Metrology
  • Mechanical Engineering
  • Instrumentation

Background:

  • High-precision angle generation is crucial for advanced scientific and industrial applications.
  • Existing angle generators often face limitations in resolution, accuracy, or complexity.

Purpose of the Study:

  • To develop and evaluate a novel angle generator with enhanced resolution and accuracy.
  • To address the challenges of scale error compensation in angular measurement systems.

Main Methods:

  • Utilized multiple ultrasonic motors for high-resolution rotational motion.
  • Implemented a cylindrical air bearing for smooth rotational guidance.
  • Developed a self-calibratable encoder employing the equal-division-averaged method for scale error compensation.
  • Configured a position feedback control loop with AC and DC operation modes.

Main Results:

  • Achieved stepwise angular motion with a resolution of 0.005 arcseconds.
  • Demonstrated effective compensation of divided circle scale errors.
  • Evaluated performance using a precision angle encoder and autocollimator.
  • Estimated expanded uncertainty (k=2) in angle generation to be less than 0.03 arcseconds.

Conclusions:

  • The developed angle generator offers high resolution and accuracy.
  • The self-calibratable encoder effectively mitigates scale errors.
  • The system demonstrates significant potential for precision angular positioning applications.