Single-chip velocity measurement system for incremental optical encoders

被引：19

作者：

Bhatti, P

Hannaford, B

机构：

[1] Department of Electrical Engineering, University of Washington, Seattle

来源：

IEEE TRANSACTIONS ON CONTROL SYSTEMS TECHNOLOGY | 1997年 / 5卷 / 06期

基金：

美国国家科学基金会;

关键词：

computer control; control hardware; control systems; optical position measurement; programmable logic devices; velocity control; velocity measurement;

D O I：

10.1109/87.641408

中图分类号：

TP [自动化技术、计算机技术];

学科分类号：

0812 ;

摘要：

A single-chip system is designed, implemented, tested, and analyzed for the measurement of velocity from incremental optical encoders with quadrature outputs, The system uses a field programmable gate array (FPGA) chip to take advantage of high flexibility and a low-cost design cycle, The device uses two counting methods: period counting for low velocities and frequency counting for high velocities to obtain high resolution measurements for a wide range of velocities with a fixed 16-b word length, Verification testing of the device was consistent with predicted error and showed that quantization errors can be made arbitrarily small by adjusting the tradeoff between velocity range and minimum resolution. This tradeoff can be adjusted by the designer by simple modifications to the basic design.

引用

页码：654 / 661

页数：8