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介绍了可重构机床对通信系统的要求,提出了一种基于宽带电力线通信(PLC,Power Line Communication)技术的新型通信系统.通过对机床电力线的信道特性和噪声频谱的分析与测量,选定了通信系统的载波频率和带宽等参数.为了对抗电力线信道的多径效应,提高频谱利用率,实现可靠高效的数据传输,采用正交频分复用技术(OFDM,OrthogonalFrequency Division Multiplex)作为调制解调方式.开发了PLC调制解调器,定义了物理层帧结构.最后以机床主轴伺服系统为例对该通信系统进行了实验验证.实验结果表明,该系统实现了有效数据传输率10 Mbit/s,误比特率(BER,Bit Error Rate)小于10-8的高效数据传输.
This paper introduces the requirements of reconfigurable machine tools for communication system and proposes a new communication system based on PLC (Power Line Communication) technology.Based on the analysis and measurement of channel characteristics and noise spectrum of power line, In order to counter the multi-path effect of power line channel, improve the spectrum efficiency and achieve reliable and efficient data transmission, orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing) is adopted as the modulation scheme This paper develops a PLC modem and defines the frame structure of the physical layer.At last, an experiment is carried out to verify the communication system by taking the spindle servo system of the machine as an example.The experimental results show that the system achieves an effective data transmission rate of 10 Mbit / s, Bit-rate (BER) less than 10-8 efficient data transmission.