四相永磁容错电机短路故障容错策略

四相永磁容错电机采用被容错齿隔开的集中式绕组结构,本质上具有一定的容错能力和故障出现后连续运行的能力.针对H桥和星形这两种驱动拓扑结构,在发生单相绕组出线端部短路时,以容错控制后的转矩满足正常需求为目标,分别采用直接转矩补偿方法和旋转磁动势不变方法进行容错控制;对两种容错控制策略进行了推导和对比分析,并对相关结果进行了磁-路联合仿真计算,验证了理论分析的正确性.     

Modelling of V–Hz and vector controlled ASDs in PSCAD/EMTDC for voltage sag studies

This paper deals with modelling and performance of adjustable speed drives (ASDs) subjected to voltage disturbances in electric supply. The aim of this study was to develop appropriate models of typical ASD and investigate their sensitivity to voltage disturbances under various practical modes of operation and control. Accordingly, scalar controlled open and closed loop volts–hertz (V–Hz) and vector controlled closed loop ASDs are modelled in PSCAD/EMTDC environment, and their performance in the presence of voltage disturbances is investigated under typical operating and loading conditions.     

科氏质量流量计数字驱动方法研究与实现

基于DDS和MDAC,研究科氏质量流量计数字驱动方法中的频率、相位、幅值跟踪。采用TMS320F28335芯片,研制科氏质量流量变送器,实现驱动方法。配以CMF025型号传感器进行了气 液两相流实验,实验结果表明,研制的变送器在两相流下能够维持流量管的振动并完成流量测量。     

中央空调压缩机驱动电机绕组重绕时的维修工艺

中央空调用压缩机电机,工作条件十分恶劣。在电机大修更换绕组后,由于维修工艺达不到要求,运行时间极短即烧毁,导致维修失败的例子很多。可以说维修工艺水平,是空调压缩机电机更换绕组成功的关键,必须予以极大的注意。     

Tooth flank modification theory of dual-torus double-enveloping hourglass worm drives

In this paper, the theory of tooth flank modification is enriched and developed for a double-enveloping toroidal worm drive. The goal and significance of the modification are expounded from the point of view of changing the tooth flank configuration for the worm gear pair. It is pointed out that the constant center distance modification, the constant transmission ratio modification, and the combination of the previous two are the convenient and reasonable modification strategies. All the corrected hourglass worm pairs, attained by employing the preceding modification methodology, can be divided into two fundamental types: the type I worm pair and the type II worm pair, from the perspective of the meshing behavior. The division criterion of the worm drive type is moreover provided on the basis of the value range of the modification parameters in this study. The meshing characteristics of the two types of the modified globoidal worm drive are summarized in detail. The results indicate that the type II worm gearing with slight modification should be the preferred style for the double-enveloping toroidal worm drive.     

AB PLC与ABB传动装置的ProfiBus-DP通讯实现

说明了AB PLC与ABB传动装置的ProfiBus-DP通讯实现之意义,并论述了设计方案,列出了具体的PLC硬件配置和软件设置方法,以及传动装置的参数设置等,较详细地阐述了AB PLC与ABB传动装置的ProfiBus-DP通讯实现方法。     

AISI4145HMOD螺杆钻具传动轴壳体的生产试制

介绍了螺杆钻具传动轴壳体的试制工艺。通过严格控制化学成分,控制锻造变形量和温度,合理调整调质热处理工艺,最终批量生产出了合格的传动轴壳体。     

基于气压传动和触摸屏的智能烫印机研发

针对当前烫印机采用薄膜轻触面板型人机界面交互性差、无网络功能、信息化和自动化水平低等问题,设计开发了一种新型智能烫印机。采用基于T5内核的串口电容触摸屏,实现了烫印工艺多模式交叉配置,提升了设备适应当前小批量定制化生产需求的能力。基于T5触摸屏集成的网络接口,实现了远程监控、算法升级、网络化生产管理。嵌入式控制系统以STM32F10系列32位高性能微控制器为核心,集成了烫印胶头温度测控模块和伺服电机驱动模块。采用UL2068达林顿管全数字化驱动气缸,高速全自动完成移印过程。实践应用表明:所开发的烫印机性能稳定,实现了烫印工艺、烫头恒温、伺服电机、高速气缸高性能一体化全自动控制。该烫印机集成度高,触摸屏显示界面友好,能够实现网络化控制与管理,具有广阔的工程应用前景。     

Synchronous electric drive of an elevator operating in close control system

A sample synchronous motor with permanent magnets has been tested in the model of a gearless drive and the results are presented. With the help of mathematical simulation, comparative calculations of synchronous motors with different geometrical sizes are carried out for two types of elevators.     

基于PLC控制技术和气压传动控制技术的汽车前悬架与转向轮螺纹装配设备研发

在装配汽车前悬架与转向轮时需要拧紧螺纹,一旦操作不当就会出现前倾角过大的缺陷,加快车轮胎的磨损,降低小轴承及轮毂紧固螺母的使用寿命。对此,本文设计了一种基于PLC控制技术和气压传动控制技术的装配设备,能有效避免上述问题。