Power line communication for control system of reconfigurable machine tools
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摘要: 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, Orthogonal Frequency 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.Abstract: The communication system requirements for reconfigurable machine tools were analyzed. A new communication system based on PLC (power line communication) was proposed. The carrier frequency and bandwidth of the communication system were settled according to the channel characteristics and noise spectrum of the power line in machine tools. To deal with multipath fading, improve the spectral efficiency, and obtain a high speed data transmission, OFDM (orthogonal frequency division multiplex) was employed as means of modulation and demodulation. A PLC modem was developed. The PHY (physical layer) frame structure was defined. A field test system based on main spindle servo system was set up. The experimental results show that it achieves a data rate of 10 Mbit/s with BER (bit error rate) less than 10-8.
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