Efficient Implementation of CNC Position Controller using FPGA

In this paper, an efficient design scheme for implementation of the High-speed CNC Position Controller (PC) using Field Programmable Gate Array (FPGA) technology is presented. The algorithm is implemented using a Distributed Arithmetic (DA)-based scheme where a Look-Up-Table (LUT) mechanism inside the FPGA is utilized. Two novel DA-based CNC Position Controllers have been proposed for FPGA implementation. The implementation results show that the two DA-based PCs use 0.8% and 1.5% logic resource of FPGA device respectively comparing the multiplier-based design uses 51.1% logic resource of FPGA device. These two DA-based designs, using a 32 MHz clock as input this can ensure the servo loop update frequency reaches I MHz to satisfy the high-speed CNC requirement.