基于PSoC的直线型超声波电动机精密定位系统

摘要

针对某直线型超声波电动机设计了一种新型驱动控制系统.该系统利用新型嵌入式芯片PSoC3作为主控制器,其内部丰富的功能模块可实现驱动信号产生及电机位移检测,并可对驱动脉冲数目进行精确控制.系统采用改变驱动脉冲数方法实现直线电动机精确快速定位,为此对超声波电动机的脉冲响应特性进行了研究,获得了驱动脉冲数与电机步进位移关系的统计特性.在此基础上,系统采用脉冲数查表控制法实现了三步以内0.5μm的定位精度.系统能够接收上位机位置指令并可反馈当前位置信息,具有大行程、快速定位的优点.%A new drive control system was designed in this paper for a linear ultrasonic motor. The system used the embedded chip PSoC3 as the main controller,whose internal function modules generated the drive signal and detected the displacement. Pulse response of the ultrasonic motor was researched. The system used pulse number look-up table control method which can achieve positioning accuracy of less than 0.5 μm. The system can receive command of the host computer and feedback the information of the current position. Its advantages are large motion distance and quick positioning.