共查询到19条相似文献,搜索用时 156 毫秒
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在超声波焊接过程中,由于焊接负载和振动系统温度等的变化使系统固有频率发生漂移,振幅脱离谐振状态.针对这一缺点,采用数字信号处理DSP技术,研究了一种基于变参数PI与全数字锁相环ADPLL相结合的超声焊接电源频率复合跟踪控制策略,即当频率的误差值大于或等于偏差设定的阀值时,采用变参数PI控制,快速准确地将电源工作频率引入锁相范围;当频率误差值小于偏差设定的阀值时,采用ADPLL控制,使超声焊接电源的工作频率精确跟踪换能器的谐振频率.试验结果表明,基于变参数PI-ADPLL控制的超声焊接电源具有频率跟踪性能好、响应速度快、工作效率高等优点. 相似文献
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超声辅助磨削要求超声电源具有稳定的高频输出特性及反应迅速的实时跟踪特性。针对传统超声电源工作频率低、输出功率低、跟踪速度慢等问题,利用STM32F103VET6控制器和直接数字频率合成(direct digital synthesize,DDS)技术,设计并实现专用于超声辅助磨削的具有高频率、高功率和高稳定性的超声电源系统,并采用基于模糊PID(proportion,integral,differential)控制器的频率自动跟踪方法,实现快速准确地频率自动跟踪。使用所设计的超声电源进行电学性能测试及超声辅助磨削加工验证试验,结果表明:所研制的超声辅助磨削专用电源在难加工材料磨削加工中运行良好。 相似文献
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《稀有金属材料与工程》2011,(Z4):79-83
The problem of digital controlling of high frequency microplasma arc welding machine has been solved through Fujitsu 16-bits single-chip processor used.Digital welding power sources and their control systems,digital sequential control system,and digital man-machine interaction system were included in digital microplasma arc welding machine studied.Principles,which is about digital sequential control system,digital man-machine interaction system,digital controller and its interface,and controlling software program,were analyzed.It has been showed that full digitalization of high frequency microplasma arc welding machine was fulfilled,minimum welding current of the machine is 0.05A,and arc is stable and can been started unfailingly. 相似文献
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SiC功率器件具备开关速度快、开关损耗低、导通损耗小等优点,有利于进一步提升焊接电源的逆变频率、响应速度,实现电弧能量的精密化控制. 设计了一套脉冲变极性逆变焊接电源,主电路采用双逆变结构,前级高频逆变电路采用SiC模块,后级低频调制逆变电路采用绝缘栅双极型晶体管 IGBT模块;设计了SiC模块驱动电路,实现了快速短路保护及米勒钳位;设计了基于ARM的全数字化控制系统,实现了PWM (pulse width modulation)以及输出电流波形的数字化控制.研制的脉冲变极性焊接电源逆变频率达到100 kHz,额定输出电流为500 A,可实现规整的脉冲变极性波形输出.结果表明,研制的基于SiC模块的脉冲变极性焊接电源能够实现稳定的焊接流程,可通过波形参数的调整有效控制焊接热输入量,获得良好的镁合金焊缝成形. 相似文献
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Digital control system for pulsed MIG welding power based on STM32 is set up with 32-bit STM32F103ZET6 directing against the pulse waveform modulation of pulsed MIG welding. High-frequency inverter and medium-low frequency pulse waveform modulation of pulsed MIG welding are realized by using the integrated PWM module within STM32 to generate PWM signals of phase-shifted full-bridge soft-switching and constant-current control of output current is achieved by means of anti-windup PI control algorithm to improve the stability and reliability of control system. Experimental results demonstrate that the designed digital control system based on STM32 can achieve perfect pulsed MIG welding technique with stable welding process and good weld appearance, fully demonstrating the advantages of digital control based on STM32. 相似文献
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研发了用于复合型超音频脉冲电弧焊接的超音频脉冲电源,其输出脉冲电流的频率和幅值可独立调节和准确控制,并提出了“并联+辅助网络”耦合方式.在建立输出脉冲电流控制模型的基础上,构建了包含降压变换器、全桥变换器和高频耦合变压器的超音频脉冲电源功率变换电路;脉冲电流频率的调节通过改变全桥变换器的开关频率实现,脉冲电流幅值采用对降压变换器的输出电压幅值和全桥变换器的输出电压占空比进行两级反馈控制,以保证其准确性和稳定性.结果表明,超音频脉冲电流的频率和幅值调节快速、准确、稳定,与焊接电弧具有良好的耦合效果. 相似文献
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基于DSP的一体化双丝脉冲MIG焊数字波控研究 总被引:1,自引:1,他引:0
为改善双丝脉冲MIG焊的协同控制,在基于单一DSP芯片TMS320LF2407A控制下的一体化双丝脉冲MIG焊接系统的基础上,利用DSP内部集成的脉宽调制模块,以软件方式实现了主、从机两台逆变电源PWM信号的直接数字化控制,从而实现主、从机的高频逆变和低频脉冲波形调制,最终实现双丝脉冲MIG焊的波形控制.针对双丝脉冲MIG焊熔滴过渡过程的控制,通过改变焊接参数进行工艺试验.试验结果表明,基于DSP的一体化双丝脉冲MIC焊协同控制系统性能稳定,能有效实现两台弧焊逆变电源之间的协同控制,焊接性能好,稳定可靠. 相似文献
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The pipeline all-position automatic welding machine system is a special welding system for automatically welding circumferential joint of pipeline on site, which has been widely used to the long-distance pipeline construction projects due to the advantages of automatic control for welding parameters at all-position, moving speed of bugs and operating. In this paper, the key control technologies of PAWM all-position automatic welding machine (developed by Pipeline Research Institute of CNPC) such as the automatic control system, control software, personal digital assistant (PDA) software and complex programmable logic device(CPLD) program as well as the control method of welding parameter have been described detailedly. With the higher welding quality, higher welding efficiency and lower labor intensity, PAWM all-position automatic welding machine has been successfully applied in many famous pipeline construction projects. 相似文献
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介绍了专家系统的原理及应用基础。在知识库的建立方面采用模糊隶属函数来对知识表示,且推理过程运用正向推理和模糊技术。在对高频焊接过程诸多参数分析后,提出了应用高级语言VisualBasic和数据库知识来实现对高频焊接过程的控制,从而实现高频焊接过程的自动化及智能化。 相似文献