Stepper Motor Control System In The Fpga-based Digital Hardware Design

Generally speaking, stepping motor is the best choice to control the movement of the mechanism accurately by a motor. The best advantage of the stepping motor is that it can control and position the mechanism accurately. The movement of stepping motor can be controlled by a number of input pulse signal. Although analog circuit can generate continuous and adjustable pulse signal, it is very difficult to control the movement of the motor accurately by MCU. The above problem can be eliminated if the stepping motor is controlled by the digital integrated circuit. Nowadays, the VHDL + FPGA design method is used for more and more designs of digital integrated circuit. It's great to use VHDL for the input method of the design because the VHDL can be compatible easily to different design platform and also can make the design speed up. The design method on VHDL+FPGA is a very useful design method of digital system now and in future. It not only can improve the digital system design to make it efficiency and flexibility greatly, but also can shorten the cycle of the product development and make the product to be sold in the market much more quickly. VHDL + FPGA design method is an innovation of digital system design, which will be developed to be the main trend in the future.The paper describes the differences among the designing methods of digital system. It also makes people know the advantages and disadvantages of VHDL language in details in different ways. At the same time, the paper introduces the field programmable gate array and focus on taking XILINX company product as an example, which supports the advantages of VHDL + FPGA when it is used to design more and more complicated digital system. In the paper the whole process to design a digital stepping motor control system by VHDL + FPGA is showed, including the instruction of FOUNDATION series software ISE for development, and the process of using VHDL to write the source code. It also shows time-sequential wave capture in the design simulation, FPGA extended circuit design, the theory about the whole system structure, etc. And then it concludes the experiences from this design. At last, it gives some thoughts on how to improve the design, and how to analyze a design project. And make a conclusion for the whole design.