The Research Of Multi-axis Motion Controller Based On DSP+FPGA

Open NC System is the most active subsection in the NC System. Open Motion Controller is the core of NC System. It is the most important for NC System to make motor move along a scheduled track, according to instructions. The functions are finished by Motion Controller. Motion Controller depending on its inherent agility and excellent ability of control make industrial equipments flourish. With the development of the micro-electronics technique and the semi-conductor craft, the capability of DSP-chip improves continuously, the cost descends, and the DSP-chip aim at motor control comes forth constantly. So the high performance motion controller adopts the chip of DSP as core mostly currently. The Motion Controllers based on DSP can carry out complicated algorithm and functions. In addition, these controllers are designed through the way that software and hardware combine together, so they are convenient and flexible. If there are a lot of discrete hardwares in peripheral circuit, the reliability is not high. On the basis of analyzing the principle of the Motion controller, a design scheme is proposed in which the chips of DSP+FPGA are adopted as core. The project combines the strongpoint of DSP and FPGA. On one hand, DSP has programmable ability and carry out complicated algorithm. On the other hand, because a lot of components of peripheral circuit are integrated in FPGA, the stability is high. At the same time, because FPGA has the reconfigure ability In-Circuit, the motion controllers have open architecture and the design of system are more convenient. First of all, the paper introduces the main fields of application and present situation of research of motion controllers in brief. Subsequently, the class and principle of motion controllers are researched in general. Then, the paper analyzes basic components and key techniques of controllers. In terms of system of carving machines, the software and hardware of the controller based on DSP+FPGA are design in detail. At the same time, the feasibility and stability have been verified by practice.