基于LPC1752轴角-数字转换系统的设计

Design of Axis-Angle to Digital Converter Based on LPC1752

目前,旋转变压器因其高精度和良好的可靠性,大量应用于数控系统、机器人控制、工业控制以及惯性导航领域中。而由于旋转变压器输出信号为模拟量信号,必须经过信号采集电路转换为数字角度信号之后才能被计算机或嵌入式控制系统所利用,在复杂的数模转换过程中,采用传统角测量技术容易产生误差增加、系统变复杂、难以实现精确等问题,且费用较高。本文从应用角度出发,介绍了双速轴角-数字转换器的工作原理,分析了精粗机数据组合产生误差的原因,研究了纠错方法。并选用高速32位ARM7微控制器作为主控芯片,设计了双速轴角-数字转换器。

Resolver is extensively used in digital control systems, robot control, industrial control, and inertial navigation field as a result of high accuracy and reliability. The output of resolver is analog signal, so it must be converted to digital signal of angle before being used in other control system or computers. In a complex process of conversion, existing angle-measured systems influence the performance of measure systems, bringing about more errors, a more complex system, difficulties in precision, and a relatively high cost. From the perspective of application, the paper introduces the operating principle of a dual-speed processor for axis-angle-to-digital con-verter. The paper analyzes the reasons for errors of the coarse-fine code combination, and studies a correction method. The paper then designs the new dual-rate convertor by using the high-rate 32-bit ARM7 MCU.