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利用多圈光电编码器具有体积小、量程大以及数字量输出等优点,设计了基于双读数系统的航天级多圈绝对式光电编码器。根据航天相机的精度要求,采用精度高、分辨率高的绝对式矩阵玻璃码盘作为一级码盘完成角度测量;根据电机转动的计数要求,采用重量轻,体积小的绝对式矩阵金属码盘作为二级码盘完成对一级码盘的转动圈数计数;其具有的双狭缝及双读数系统可实现信号处理电路冷备份。按照鉴定级航天产品要求,通过热学环境实验和力学环境实验对编码器性能进行了验证。实验结果表明,所设计的编码器精度范围为±100″内、分辨率为80″、测量圈数为16圈、外形尺寸为φ50 mm×50 mm、重量为270 g,稳定性高、可靠性强,且满足高分辨率航天设备设计指标。
The multi-turn photoelectric encoder has the advantages of small size, large range and digital output, and has designed a space-based multi-turn absolute optical encoder based on a dual-reading system. According to the precision requirements of aerospace cameras, the absolute matrix glass code plate with high precision and high resolution is used as the first-level code plate to complete the angle measurement. According to the counting requirements of the motor rotation, the lightweight, small-sized absolute matrix metal code plate As a secondary encoder to complete the rotation of a code wheel count; its double slits and dual reading system can be cold signal processing circuit to achieve backup. In accordance with the requirements of appraisal-grade aerospace products, the performance of the encoder was verified through thermal environment experiments and mechanical environment experiments. The experimental results show that the designed encoder has a precision range of ± 100 “, a resolution of 80”, a measuring circle of 16 rings, an external dimension of φ50 mm × 50 mm, a weight of 270 g, high stability and reliability Strong, and meet the high-resolution aerospace equipment design specifications.