In order to achieve beam scanning of mechanical phased array antenna, the brushed DC motor (BDCM) is adopted to drive a helical antenna element to rotate to a predetermined radiation phase. The paper uses the digital signal processor (DSP) TMS320F2812 to implement the position control system of BDCM, and describes the hardware design, control strategy and software design of the control system. In order to achieve fast and no overshoot response, the fuzzy proportional integral derivative (PID) control algorithm is researched and applied to the control system. Experiment results indicate that the position control system of BDCM is simple, and has good control performance, which can meet the requirements of fast and accurate phase control of the helical antenna element.%为实现机械相控阵列天线的波束扫描,采用直流电机驱动螺旋天线单元转动来达到预定的辐射相位.利用数字信号处理芯片TMS320F2812设计了直流电机位置控制系统,介绍了控制系统的硬件设计方案、控制策略及软件设计方案.针对直流电机驱动的螺旋天线单元位置控制系统,研究了模糊PID控制算法,并把它应用到控制系统中.实验结果表明,所开发的位置控制系统结构简单,具有响应时间短、无位置超调、定位精度高等良好的控制性能,能够满足螺旋天线单元快速、准确的相位控制要求.
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