硬盘读写磁头定位数字控制器的设计

The Design of a Computer Harddisk Read/Write Headposition Controller

本文首先建立了磁头定位系统的数学模型——能观的状态标准型,然后用Tustin法求得了离散化的Z变换传递函数.根据根轨迹走向,引入相位超前的数字校正.最后用MATLAB进行了数字仿真.

In this paper, a model for read/write head is presented at first, i. e. , the standard state space system of observability, and then, the continuous-time state-space is converted to discrete time G(z) by means of Tustin method. According to the orientation of the locus of the roots, a phase lead digital controller with some zeros is introduced. Finally , a numerical example is given to show the robustness of this design with MATLAB.