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题目:The application of reconfigurable logic to high speed CNC milling machines controllers
Abstract
Reconfigurable logic has gained relevance in high-speed computer numerical control (CNC) digital controllers where high processing speed at the servo loop update time is critical. Reconfigurable devices like field programmable gate array (FPGA) have advantages over microprocessors and DSP with similar logic complexity because their open architecture makes them suitable for system on-a-chip applications. The contribution of this work is the development of an FPGA-based proportional–integral–derivative (PID) controller applied to a high-speed CNC milling machines in order to achieve the servo loop update time requirements. Results show PID system functionality, which has been synthesized into a low-cost FPGA platform, successfully applied to a high-speed CNC milling machine. r 2007 Elsevier Ltd. All rights reserved.
Keywords: Reconfigurable logic; High-speed control; FPGA; Servo loop update time
1. Introduction
High-speed computer numerical control (CNC) machine motion control involves feed-rates superior to 40 m/min as well as acceleration dynamics above 1 G and in some cases
2G (Wang, Liu, & Ai, 2003). Due to these facts, a motion controller for high-speed CNC machines has higher demands on the electronics design compared with a conventional speed CNC, this requires higher sampling rates (servo loop update time) which reduce the available time for on-line processing. PMAC (Delta Tau, 2005), and DMC-18 0 (Galil Motion, 2004) are some of the most popular commercially available CNC controllers based on off-the-shelf digital signal processor (DSP) and microcon- trollers for the implementation of their proprietary control algorithms, where additional resources are also for processor support on a fixed and closed architecture, which is well suited for standard speed processing. Due to the sequential processing data flow on commercially available DSP and microprocessors, the increase in sampling rate for high-speed control can impose severe restrictions on the processor performance; therefore, other alternatives for signal processing must be considered in order to achieve on-line operation.
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参考资料:有道词典