基于DSP的快速轴角变换方法

A DSP-Based Fast Tracking Resolver-to-Digital Conversion Method

应用不适当的轴角变换方式会引起严重的测角误差,传统的二型跟踪轴角变化方法转换带宽受限,在动态响应要求高的场合使用时会产生较大的跟踪偏差,从而导致较大角度测量误差。以往多采用专用芯片实现轴角变换功能,存在价格高、外围器件的参数选取复杂等问题,随着微处理器技术的发展,高精度运动控制系统中普遍采用数字控制,可以利用高性能的DSP芯片的剩余资源完成测角系统中轴角变换的功能。为此提出一种基于DSP实现的快速轴角变换方法,仿真实验结果表明该方法可以改善传统跟踪型动态响应特性。基于DSP冗余资源实现的快速轴角变换方法,可以简化控制系统的硬件结构降低成本,并且参数容易整定,具有实际应用价值。

Motion control in industrial automation system is placing increasing demands on the position feedback mechanisms. When an unsuitable Resolver-to-Digital （RDC） method is adopted, angle measuring error will increase. Traditional tracking RDC is limited by its frequency response band - width. Thus it is not fit for the angle measuring system which requires fast frequency response. Otherwise, it will bring large tracking error to angle measuring system. IC is used to fulfill RDC function. It is high cost, and its peripheral parameter is difficulty to tune. With rapidly development of microprocessors, they are more and more applied in motion control systems. To take full of the resource of DSP, RDC function can be accomplished with its redundant hardware and software. A DSP-based RDC method is presented, in which a fast tracking method is proposed to implement resover-to-Digital conversion. Sinmlation results show the superior performance of the fast tracking Resover-to-Digital conversion method. The proposed method is fit for practical using. It can simplify the hardware, and its parameter is easily tuned.