普传科技PI9000系列变频器在起重机行业的应用

本文介绍了普传科技PI9000系列变频器在起重机上的应用,使用PI9000变频器控制后,有效保证了起重机安全、稳定地运行,系统生产效率得到了极大提高,同时方便操作,易于维护。为客户节约了运行成本,提高了工作效率,值得广泛推广和使用。     

英威腾HV190变频器在起重机中的应用

本文分析了起重机的运行特点,详细阐述了英威腾CHV190起重机专用变频器用于起重机调速时的选型原则和周边设备的容量计算方法,并介绍TCHV190变频器在门式起重机中的应用案例。     

西门子变频器在冶金起重机中的应用

本文主要简单的介绍了冶金起重机的构成系统,通过对应用西门子变频器的冶金起重机控制系统进行分析,来探讨西门子变频器在冶金起重机中的应用优势,以保障冶金起重机的正常运行,确保冶金过程中的浇筑等施工任务顺利完成,从而充分发挥冶金起重机的作用,有效应用西门子变频器,推动冶金工业的可持续发展.     

交流变频调速技术在1100t门式起重机中的应用

本文分析了门式起重机的运行特点，详细阐述了交流变频调速技术用于1100t门式起重机时的电动机，变频器及其制动方式的选型原则和变频器周边设备的容量计算方法，概述了PLC在变频调速中的灵活应用，简述在变频器了PLC安装和布线中应注意的一些问题。     

变频控制系统在港口门座起重机上的应用

针对港口门座起重机的控制方式,本文提出采用罗克韦尔自动化集成架构控制方式,通过了解门座起重机的工况,经过合理计算、选择变频器控制系统,实现门座式起重机运行的安全性和可靠性。     

新时达AS600系列变频器在抓斗门座机上的应用

在经济全球化的背景下,港口、码头等事业得到了快速发展,在此,起重机械发挥着举足轻重的作用。为改善起重机械传统调速的缺点,越来越多的起重机械使用变频调速技术。本文根据浙江舟山一台MQ1630抓斗门座式起重机的机构参数、运行工况等要求,使用新时达AS600系列起重专用变频器对该抓斗门座式起重机进行交流变频调速设计。经过现场调试和试运行,系统能够满足现场使用要求,并且到目前为止运行状态良好。     

起重机变频传动及其调速系统综述(下)

由于起重机的特殊性和高性能的要求,使其应用变频器起步较晚,直到上世纪80年代后期才开始采用变频器进行调速控制。本文对起重电动机四象限运行的特点、位能负载的电动机转矩特性、起重用变频器的专用化特点及其代表产品等问题进行了详细的综述,最后对起重变频器的重要应用问题作了深入分析和展望。     

起重机变频传动及其调速系统综述(上)

由于起重机的特殊性和高性能的要求,使其应用变频器起步较晚,直到上世纪80年代后期才开始采用变频器进行调速控制。本文对起重电动机四象限运行的特点、位能负载的电动机转矩特性、起重用变频器的专用化特点及其代表产品等问题进行了详细的综述,最后对起重变频器的重要应用问题作了深入分析和展望。     

Vacon变频器在提升机低频制动系统上的应用

本文介绍了矿井提升机制动要求,提出用低压变频器控制高压电机设计方案。低压变频器用于控制提升机实现低频制动时,需要控制变频器输出电压实现转矩控制,本文设计了P I D控制器,实现变频器的输出电压控制。给出了变频器低频制动控制系统结构,介绍了变频器软件程序的设计。试验结果表明,此低频制动系统具有较好的控制效果。     

调速传动用四象限级联中压变频器(上)

由于性能优良,H桥级联变频器在中压调速传动中得到最广泛应用。通常这类变频器H桥中的交-直变换都采用二极管整流,使之不能四象限工作。把二极管整流改为PWM整流(AFE),变频器就可以四象限工作,但需在整流输入端增加电感和电容,控制也复杂。本文建议改用I GBT整流/回馈单元,器件按同步开关模式工作,使变频器成为具有与常规H桥级联变频器同样性能的四象限变频器,且不必像AFE那样增加电感和电容,控制也特别简单。矩阵变换器MC是一类性能优良的PWM交-交直接变频器。通过三相/单相MC桥的级联可以实现四象限中压变频。文中介绍了安川公司的MC桥级联中压变频器,并把它和基于整流/回馈单元的H桥级联中压变频器进行比较。     

Acoustic-resonance-free electronic ballast for automotive HID lamps

A novel cost-effective and acoustic-resonance-free electronic ballast used to drive automotive high intensity discharging (HID) lamps that utilise a constant lamp power control scheme is proposed. The presented ballast is comprised of a buck-boost flyback converter to provide negative DC voltages and a half-bridge-type inverter to supply the lamp with low-frequency, square-wave AC voltage/ current. Owing to its low-frequency operation, no acoustic resonance occurs on the automotive HID lamps. Design guidelines and experimental results are demonstrated for a 35 Wautomotive HID lamp prototype ballast operating at 400 Hz switching frequency with battery input DC voltage of 12 V.     

Design and analysis of automotive high intensity discharge lamp ballast using micro controller unit

A new scheme of the automotive high intensity discharge (HID) lamp ballast systems is proposed. The proposed scheme is consisted of the high frequency DC-DC converter and the low frequency DC-AC inverter as same as conventional HID ballast system. However this system separates the input voltage of the ignitor from DC link voltage using auxiliary winding, which results in the use of the lower voltage rating power devices for HID lamp ballast system compared with conventional system. As a result, proposed system has a lower cost or a higher efficiency. For the improvement of the efficiency, the proposed ballast controller using micro-controller unit (MCU), controls the frequency to operate the DC-DC converter in critical conduction mode. This paper presents the design and analysis of the proposed ballast and some experimental results.     

Novel Automotive High Intensity Discharge(HID) Lamps with Electronic Ballasts

A new scheme of automotive high intensity discharge(HID) lamps with electronic ballasts is proposed. The design of the proposed ballast and some experimental results are presented. The proposed scheme is consisted of the high frequency DC-DC converter and the low frequency DC-AC inverter. This system separates the input voltage of the ignitor from DC link voltage using auxiliary winding, then it could use the lower voltage rating power devices for HID lamp ballast system and reduce the size of HID lamp ballast. The proposed ballast controller using micro-controller unit(MCU) controls the frequency to operate the DC-DC converter in critical conduction mode, which reduces the noise of the circuit and improves the efficiency by 2%~4%.     

1336系列变频器在阳极焙烧多功能天车控制系统中应用

本文主要介绍了中国铝业青海分公司炭素四期阳极焙烧多功能天车电气控制技术。由于整车电气系统采用罗克韦尔PLC网络控制,天车具有故障报警及运行参数监控功能;大车、小车行走采用1 336系列变频器调速,满足了天车快速进行阳极运送和超低速在焙烧炉面作业(装炉、清料和加料)的需要,同时实现了准确对位和安全作业的要求,提升了焙烧多功能天车综合性能。     

Low-cost high power-density electronic ballast for automotive HIDlamp

A low-cost high-efficiency high power-density electronic ballast for 35 W automotive high intensity discharge (HID) is presented along with the results of theoretical computations and experimental tests. The ballast circuits is based on a 100 kHz resonant inverter, a half-wave rectifier and a 400 Hz operated square-wave inverter. The converter operates at zero turn on losses, nearly zero turn off losses, and at a reduced electromagnetic interference level. The ballast circuit is designed to prevent inappropriate operations due to the acoustic resonances. The lamp voltage waveform has limited dv/dt and no DC component contributing to a long operating life of the lamp. A breadboard of the electronic ballast was designed and experimentally tested on a 35 W lamp, for a DC input voltage ranging from 9 V to 16 V. The electronic ballast performs all the features required to turn-on, warm-up and drive at the steady state a 35 W HID lamp and operates at a maximum steady state efficiency η=84%,     

A Novel Constant Power Control Circuit for HID Electronic Ballast

This paper presents a constant power control circuit for a three-stage high-intensity discharge (HID) electronic ballast. The three-stage electronic ballast is composed of a boost pre-regulator to achieve a high power factor, a DC/DC buck converter to regulate lamp current with constant lamp power, and a full-bridge inverter to drive the HID lamp with a low-frequency ac squarewave current. The buck converter operating in current mode utilizes current sense level-shift technique to achieve constant power output. The proposed constant power control circuit is easily designed and implemented for the three-stage HID electronic ballast. Finally, a laboratory prototype of a 70 W HID electronic ballast is implemented. The measured results show that the proposed ballast can be applied for various HID lamps with low lamp power variation (less than 0.6%).     

台达AFE2000在某港口龙门吊的应用

本文主要阐述了台达能量回馈单元AFE2000在某港口龙门吊的应用,通过AFE2000的高效率能量回馈功能,实现起重变频器的四象限运行,使用AFE2000替代传统的煞车单元和煞车电阻,并将重物下降过程中将电机发电的能量重新逆变回馈到电网中去,实现龙门吊最大程度的节能,同时改善某港口电网质量。     

合康变频HID600A系列高性能矢量变频器在数控机床的应用

现代制造技术的快速发展对数控机床的使用提出了更高的要求。合康变频专注于变频调速技术,自主研发的HID600A系列高性能矢量变频器凭借优越的性能及高性价比成功应用于数控机床行业。本文主要介绍合康变频HID600A在台州楚门镇硕瑞机械厂数控机床的典型成功应用。     

A high-frequency electronic ballast for HID lamps based on aλ/4-long distributed constant line

A novel type of solid-state ballast, which operates in the megahertz-range frequency, is presented in this paper. A circuit composed of a voltage-source half-bridge inverter, a distributed constant line and a parallel LC resonant circuit has been developed for this purpose. The high-intensity discharge (HID) lamp is connected to the output terminal of the inverter through the distributed constant line. Here, since the length of the line is adjusted to 1/4 of the propagation wavelength λ (λ/4 condition), the output voltage of the voltage-source inverter can be converted to a current source on the load side. Therefore, the ballast can supply not only high voltage to the HID lamp for initiating discharge, but also stable current to it during discharge condition. The modification of the proposed circuit is also proposed in order to expand the operating frequency without increasing the undesirable harmonic current. The experimental results from a prototype system verify the theoretical procedure