An approach of micro-stepping control for the step motors based on FPGA

In this paper, for improving the control system of some bio-chemistry analysis instrument, an approach of micro-stepping control for the step motors based on field programmable gate array (FPGA) is presented after the micro-stepping driving theory of the step motor with a constant torque was discussed deeply. And then the relative control system is schematically designed, mainly includes the internal logic design of the FPGA, the communication interface design of the microcomputer, the design of the power driving circuit, and the design of the interface circuit between the electrical sources. At last, it is verified by some experimental investigations that the control theory and approach presented in the paper are corrective, and the control system designed is very good to get a high precision of position control and high control repeatability. So the technology questions from the producing reality are resolved and the product quality is promoted