摘要
大型天文望远镜对恒星跟踪时,其跟踪低速性能要求比较高,要达到此速度控制精度,需选取合适的编码器,恒星速度为0.004°/s,伺服系统速度回路采样频率800Hz时,编码器分辨率为26位才能达到测速要求。而国产绝对式轴角编码器的分辨率只能达到24位,不能满足系统测速要求,因此我们采用雷尼绍公司的26位增量式光栅编码器。由于对26位编码器直接测试存在技术难度,因此我们采用与绝对式编码器进行比对的方式对其性能进行说明。通过实验,我们断定其测速性能优于目前国产的绝对式编码器。
The low velocity performance of tracking must be high when telescope tracking star.So we should choice proper encoder.Star's turning velocity is nearly 0.004°/s.When the servo loop's sampling frequency is 800Hz,the encoder's resolution must be 26 bit,that can meet the velocity measurement's require.But the best absolute encoder made in china is 24 bit,so we use the Renishaw's 26 bit incremental encoder.We havn't the condition to directly test it's performance,so we can obtain it's performance form comparison and analysis of incremental encoder and absolute encoder.Through the test,we can draw the conclusion that 26 bit incremental encoder have higher performance than 24 bit absolute encoder.
出处
《机械设计与制造》
北大核心
2011年第1期96-97,共2页
Machinery Design & Manufacture
基金
中科院三期创新基金支持项目
关键词
增量式光栅编码器
测速性能
绝对式编码器
Incremental encoder
Performance of measuring velocity
Absolute encoder