基于Nios的微距控制系统的数字设计

设计了一种基于Nios处理器的微距控制系统，用于实现虚拟成像设备系统视标位置的精确定位。系统采用现场可编程门阵列(FPGA)实现对步进电机PWM的细分驱动和对光栅尺输出信号的鉴相倍频，构建了基于Nios的微距控制系统的数字设计部分。采用Altera公司的FPGA设计工具Quartus II和嵌入式开发套件 Nios IDE，将可配置的软核处理器与可编程的硬件电路集于一体，既实现了软件处理的灵活性，又具有硬件处理的高速性特点。实验表明，该设计在虚拟成像设备的标视定位中取得了良好的效果，实现了精度为1.25 μm的微距控制。

Design of micro distance controller based on Nios

A micro distance controller based on a Nios processor was designed to locate precisely for a visual indicator in virtual imaging equipment. By using a Field Programming Gate Array(FPGA) to realize the subdividing drive of Pulse Width Modulation(PWM) controller for a stepper motor and to implement the phase identification and frequency doubling of output signals of a grating sensor, the digital system of the micro-distance controller was constructed. With the design tool of Quartus II from Altera′s and an Embedded Design Suite Nios, the Nios processor and programming hardware circuits were integrated into one chip, so the system shows excellent flexibility and speediness from the parts of software and hardware. Experimental results indicate that the proposed micro distance controller achieves a good visual indicator position in virtual imaging equipment, and the controlling accuracy of micro distance can reach 2.5 μm.