检索结果-南通市图书馆

Optimal Designs of Wound Field Switched Flux Machines with Different DC Windings Configurations

在线全文

学校读者我要写书评

暂无评论

引用

CES Transactions on Electrical Machines and Systems 2022年第4期6卷 359-367页

作者： Wenting Wang Yuankui Wang Enlin Ma Lijian Wu IEEE Zhejiang University Hangzhou3100005 China China State Shipbuilding Corporation Ltd.

Wound field switched flux(WFSF)machines exhibits characteristics of the simple robust rotor,flexible flux-adjustable capability,and no risk of ***,they suffer from a poor torque density compared with permanent magnet machines due to the ***,in this paper,two WFSF machines with single-and double-layer DC windings,respectively,are optimized for the maximum *** end-winding(EW)lengths differ in these two machines,which can affect the optimal *** parameters including the DC to armature winding copper loss ratio,slot area ratio and split ratio are optimized when two machines have the same copper loss and overall *** addition,the influence of the flux density ratio,total copper loss,air-gap length and aspect ratio on the optimal split ratio is investigated using the finite element method and results are explained through the analytical model accounting for the *** is discovered that the EWs have no effect on the optimal copper loss ratio,which is *** terms of the slot area ratio,the machine with single-layer DC windings prefers smaller DC slot areas than armature slot *** the WFSF machine with longer EWs,the optimal split ratio becomes ***,compared with other parameters,the flux density ratio can significantly affect the optimal split ratio.

关键词： Design End-winding Optimization split ratio Wound field switched flux machine

Comparative Study on Torque Performance of Five-phase Single-Stator and Double-Stator Permanent Magnet Synchronous Motors

在线全文

学校读者我要写书评

暂无评论

引用

CES Transactions on Electrical Machines and Systems 2022年第1期6卷 46-52页

作者： Jing Zhao You Wang Jingqi Li Hengzai Hu School of Automation Beijing Institute of TechnologyBeijing100081China United Automotive Electronics Co. LtdShanghaiChina

This paper compares the torque characteristics of single stator permanent magnet synchronous motor(PMSM)and double-stator PMSM under different split-ratios,air-gap lengths and shaft diameters by finite element ***,the effects of split-ratio towards the torque characteristics of the two motor structures under different air-gap lengths are researched,the results show that the optimal split-ratios of the two motor structures do not change under different air-gap lengths,and the optimal split-ratio of the double-stator motor is greater than that of single-stator,and the torque of the double-stator motor is greater than that of single-stator motor with arbitrary split-ratio under the same air-gap length;Finally,the effects of the shaft diameter to the torque of the two motor structures are investigated,obtaining that with the increasing of shaft diameter,the electromagnetic torque of the single-stator motor is almost unchanged,however,the torque of the double-stator is gradually reduced,when the shaft diameter reached a certain extent,the electromagnetic torque of the double-stator motor is smaller than that of single-stator motor with the split ratio within a certain range,and the torque/quality ratio of the double-stator motor is smaller than that of single-stator motor with their optimal split ratio separately.

关键词： Five-phase PMSM double-stator single-stator split ratio electromagnetic torque

A New Strategy of Integrated Control and On-line Optimization on High-purity Distillation Process

在线全文

学校读者我要写书评

暂无评论

引用

Chinese Journal of Chemical Engineering 2010年第1期18卷 66-79页

作者：吕文祥朱鹰黄德先江永亨金以慧 Department of Automation Tsinghua University Beijing 100084 China Tsinghua National Laboratory for Information Science and Techology Beijing 100084 China

For high-purity distillation processes,it is difficult to achieve a good direct product quality control using traditional proportional-integral-differential(PID)control or multivariable predictive control technique due to some difficulties,such as long response time,many un-measurable disturbances,and the reliability and precision issues of product quality *** this paper,based on the first principle analysis and dynamic simulation of a distillation process,a new predictive control scheme is proposed by using the split ratio of distillate flow rate to that of bottoms as an essential controlled ***,a new strategy with integrated control and on-line optimization is developed,which consists of model predictive control of the split ratio,surrogate model based on radial basis function neural network for optimization,and modified differential evolution optimization algorithm. With the strategy,the process achieves its steady state quickly,so more profit can be *** proposed strategy has been successfully applied to a gas separation plant for more than three years,which shows that the strategy is feasible and effective.

关键词： distillation process control split ratio surrogate model optimization modified differential evolution