A high-performance digital servo system built on the platform of a field programmable gate array (FPGA),a fully digitized hardware design scheme of a direct torque control (DTC) and a low speed permanent magnet synchr...A high-performance digital servo system built on the platform of a field programmable gate array (FPGA),a fully digitized hardware design scheme of a direct torque control (DTC) and a low speed permanent magnet synchronous motor (PMSM) is proposed. The DTC strategy of PMSM is described with Verilog hardware description language and is employed on-chip FPGA in accordance with the electronic design automation design methodology. Due to large torque ripples in low speed PMSM,the hysteresis controller in a conventional PMSM DTC was replaced by a fuzzy controller. This FPGA scheme integrates the direct torque controller strategy,the time speed measurement algorithm,the fuzzy regulating technique and the space vector pulse width modulation principle. Experimental results indicate the fuzzy controller can provide a controllable speed at 20 r min-1 and torque at 330 N m with satisfactory dynamic and static performance. Furthermore,the results show that this new control strategy decreases the torque ripple drastically and enhances control performance.展开更多
An innovation is conducted on a K190πK rail auto welding machine because of its poor stability in quality of welding joints. A new control system based on a programmable controller is designed to replace the old o...An innovation is conducted on a K190πK rail auto welding machine because of its poor stability in quality of welding joints. A new control system based on a programmable controller is designed to replace the old one. The new control system is of higher accuracy in controlling sequence and good ability in anti disturbance, and is convenient to operate. The comparison tests are carried out. The experimental results show that the quality of welded joints is greatly increased by the improved welding mechine.展开更多
为满足车载显示设备低成本、小体积、高性能以及高可靠性的要求,提出了一种基于片上可编程系统SOPC(System On a Programmable Chip)和乒乓存储显示技术的车载信息终端设计。以现场可编程门阵列FPGA(Field Programmable Gate Array)作...为满足车载显示设备低成本、小体积、高性能以及高可靠性的要求,提出了一种基于片上可编程系统SOPC(System On a Programmable Chip)和乒乓存储显示技术的车载信息终端设计。以现场可编程门阵列FPGA(Field Programmable Gate Array)作为硬件载体,构建了基于PowerPC软处理器的液晶显示器LCD(Liquid CrystalDisplay)控制单元,并以电子控制单元ECU(Electronic Control Unit)的形式接入到汽车自动控制系统中,形成具有汽车状态的监测与存储功能的人机交互系统。对系统进行了时序与功能仿真,并通过了硬件平台的测试。实验数据表明,该系统可以实时显示行车信息并提供流畅的视觉体验。展开更多
为满足微小卫星对姿轨控计算机高性能、低功耗以及丰富的外设接口的要求,采用Cyclone IV FPGA芯片设计了姿轨控计算机,并且通过硬件编程实现外设接口控制器IP核,并将其集成到现场可编程门阵列(Field programmable gate array,FPGA)中,...为满足微小卫星对姿轨控计算机高性能、低功耗以及丰富的外设接口的要求,采用Cyclone IV FPGA芯片设计了姿轨控计算机,并且通过硬件编程实现外设接口控制器IP核,并将其集成到现场可编程门阵列(Field programmable gate array,FPGA)中,提高系统集成度。此外,使用可编程片上系统(System on programmable chip,SoPC)技术在FPGA中实现了硬浮点运算,加快了NiosII软核处理浮点运算的速度。实测表明,采用Cyclone IV FPGA设计的姿轨控计算机具有功耗低、运算速度快以及接口丰富等特点,能够满足微小卫星对姿轨控计算机的要求。展开更多
基金the Natural Science Foundation of Hubei Province (No.2005ABA301)
文摘A high-performance digital servo system built on the platform of a field programmable gate array (FPGA),a fully digitized hardware design scheme of a direct torque control (DTC) and a low speed permanent magnet synchronous motor (PMSM) is proposed. The DTC strategy of PMSM is described with Verilog hardware description language and is employed on-chip FPGA in accordance with the electronic design automation design methodology. Due to large torque ripples in low speed PMSM,the hysteresis controller in a conventional PMSM DTC was replaced by a fuzzy controller. This FPGA scheme integrates the direct torque controller strategy,the time speed measurement algorithm,the fuzzy regulating technique and the space vector pulse width modulation principle. Experimental results indicate the fuzzy controller can provide a controllable speed at 20 r min-1 and torque at 330 N m with satisfactory dynamic and static performance. Furthermore,the results show that this new control strategy decreases the torque ripple drastically and enhances control performance.
文摘An innovation is conducted on a K190πK rail auto welding machine because of its poor stability in quality of welding joints. A new control system based on a programmable controller is designed to replace the old one. The new control system is of higher accuracy in controlling sequence and good ability in anti disturbance, and is convenient to operate. The comparison tests are carried out. The experimental results show that the quality of welded joints is greatly increased by the improved welding mechine.
文摘为满足车载显示设备低成本、小体积、高性能以及高可靠性的要求,提出了一种基于片上可编程系统SOPC(System On a Programmable Chip)和乒乓存储显示技术的车载信息终端设计。以现场可编程门阵列FPGA(Field Programmable Gate Array)作为硬件载体,构建了基于PowerPC软处理器的液晶显示器LCD(Liquid CrystalDisplay)控制单元,并以电子控制单元ECU(Electronic Control Unit)的形式接入到汽车自动控制系统中,形成具有汽车状态的监测与存储功能的人机交互系统。对系统进行了时序与功能仿真,并通过了硬件平台的测试。实验数据表明,该系统可以实时显示行车信息并提供流畅的视觉体验。
文摘为满足微小卫星对姿轨控计算机高性能、低功耗以及丰富的外设接口的要求,采用Cyclone IV FPGA芯片设计了姿轨控计算机,并且通过硬件编程实现外设接口控制器IP核,并将其集成到现场可编程门阵列(Field programmable gate array,FPGA)中,提高系统集成度。此外,使用可编程片上系统(System on programmable chip,SoPC)技术在FPGA中实现了硬浮点运算,加快了NiosII软核处理浮点运算的速度。实测表明,采用Cyclone IV FPGA设计的姿轨控计算机具有功耗低、运算速度快以及接口丰富等特点,能够满足微小卫星对姿轨控计算机的要求。
