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The gimbal control performance of Single Gimbal Control Moment Gyroscopes (SGCMG) is a crucial factor affecting the output performance of Control Moment Gyro (CMG). The precision of low-speed gimbal angle sensors emerges as a critical determinant of gimbal control performance. The utilization of high-precision frame-angle sensors emerge as an essential prerequisite for achieving precise control within such frameworks. This paper designs a new high-precision grating angle measurement sensor and a low-speed frame control system based on high-precision gratings, significantly enhancing the control accuracy of SGCMG at extremely low speeds. Through simulations and experiments, it is evident that employing a 25-bit optical grating for angle measurement, in contrast to a 21-bit rotary encoder, results in a 70% increase in rotational speed accuracy and an 80% improvement in stability at extremely low rotational speeds, thus demonstrating a noticeable enhancement in control performance.

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Low-Speed Frame Control of SGCMG Based on High-Precision Grating Angle Measurement

  • 会议论文

  • 发表日期：

    2025年

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  • Weiheng Zhao,
  • Limei Tian,
  • Nuo Su,
  • Yuewei Hu,
  • Qiang Zhang,
  • Ming Lu,
  • Zhulin liang,
  • Zhixin Zhao

摘要

The gimbal control performance of Single Gimbal Control Moment Gyroscopes (SGCMG) is a crucial factor affecting the output performance of Control Moment Gyro (CMG). The precision of low-speed gimbal angle sensors emerges as a critical determinant of gimbal control performance. The utilization of high-precision frame-angle sensors emerge as an essential prerequisite for achieving precise control within such frameworks. This paper designs a new high-precision grating angle measurement sensor and a low-speed frame control system based on high-precision gratings, significantly enhancing the control accuracy of SGCMG at extremely low speeds. Through simulations and experiments, it is evident that employing a 25-bit optical grating for angle measurement, in contrast to a 21-bit rotary encoder, results in a 70% increase in rotational speed accuracy and an 80% improvement in stability at extremely low rotational speeds, thus demonstrating a noticeable enhancement in control performance.