检索结果-南通市图书馆

Robustness Criteria for Concurrent Evaluation of the Impact of Tolerances in Multiobjective electric machine Design Optimization

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

CES Transactions on electrical machines and Systems 2020年第1期4卷 3-12页

作者： Gerd Bramerdorfer Department of electrical Drives and Power Electronics Johannes Kepler University LinzAustria

This article is about a comparison of different measures for determining the robustness or reliability of electric machine designs in the presence of inevitable tolerances.The selected criteria shall be suitable for concurrent evaluation in the course of solving state-of-the-art large scale multi-objective opti-mization problems.In the past,besides particularly customized criteria,mainly gradient based measures,worst case information,or standard deviation based quantities were considered.In this work,the quantile measure is introduced for electric machine design optimization and compared with the existing solutions.The evaluation of a design’s robustness is typically examined based on finite element simulations.As for most measures a signif-icant number of parameter combinations and thus computations are required,a surrogate model assisted approach is presented to minimize computational effort and runtime.A test problem is defined and analyzed to illustrate the differences of selected robustness measures.Results reveal the importance of considering robustness in the optimization process.Moreover,a careful choice of appropriate measures has to be taken.Selected designs are compared and conclusions and an outlook on future activities are presented.

关键词： electric machine optimization robustness sen-sitivity six sigma tolerance analysis quantile

Multiobjective electric machine Optimization for Highest Reliability Demands

在线全文

学校读者我要写书评

暂无评论

CES Transactions on electrical machines and Systems 2020年第2期4卷 71-78页

作者： Gerd Bramerdorfer Department of electrical Drives and Power Electronics Johannes Kepler University LinzAustria

This article is about illustrating a workflow for incorporating reliability measures to typical electric machine design optimization scenarios.Such measures facilitate comparing designs not only for rated conditions,but also allow to analyze their performance in the presence of unevitable tolerances.Consequently,by additionally considering reliability or robustness as objectives compared to conventional optimization scenarios,designs featuring low parameter sensitiveness can be obtained.The analysis of the design’s reliability as part of solving optimization problems involves a significant increase in required numerical evaluations.To minimize the associated prolongation of the runtime,an approach featuring a design of experiments based reduction of required computations and a consequent surrogate modeling technique is presented here.After successful training,the metamodel can be applied for fast evaluating lots of different parameter combinations.A test problem is defined and analyzed.Based on the observed findings,the necessity of incorporating robustness evaluations to machine design optimization becomes evident.In addition,the derived models allow for studying the impact of any tolerance-affected parameter on the machine performance in detail.This facilitates further beneficial studies,as for instance the analysis of selected changes of tolerance levels rather than a general minimization of the respective ranges which usually is associated with high production cost.

关键词： electric machine optimization,reliability ro-bustness,sensitivity six sigma tolerance analysis

Parameter estimation and reliable fault detection of electric motors

在线全文

学校读者我要写书评

暂无评论

Control Theory and Technology 2014年第2期12卷 110-121页

作者： Dusan PROGOVAC Le Yi WANG George YIN Delphi Corporation 3000 University Drive Auburn Hills MI 48326 U.S.A. Department of electrical and Computer Engineering Wayne State University Detroit MI 48202 U.S.A. Department of Mathematics Wayne State University Detroit MI 48202 U.S.A.

Accurate model identification and fault detection are necessary for reliable motor control. Motor-characterizing parameters experience substantial changes due to aging, motor operating conditions, and faults. Consequently, motor parameters must be estimated accurately and reliably during operation. Based on enhanced model structures of electric motors that accommodate both normal and faulty modes, this paper introduces bias-corrected least-squares （LS） estimation algorithms that incorporate functions for correcting estimation bias, forgetting factors for capturing sudden faults, and recursive structures for efficient real-time implementation. Permanent magnet motors are used as a benchmark type for concrete algorithm development and evaluation. Algorithms are presented, their properties are established, and their accuracy and robustness are evaluated by simulation case studies under both normal operations and inter-turn winding faults. Implementation issues from different motor control schemes are also discussed.

关键词： electric machine Parameter estimation Fault detection Brushless direct current （BLDC） motor Bias correction Forgetting factor

Overview of Advanced Control Strategies for electric machines

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of electrical Engineering 2017年第2期3卷 53-61页

作者： Chunhua Liu Yixiao Luo Shenzhen Research Institute City University of Hong KongShenzhen518057China School of Energy and Environment City University of Hong KongHong KongChina

Control strategies play a key role for operation of electric machines,which would directly affect the whole system performance.In fact,different control strategies have been executed and explored for electric machines,which bring great impacts to industrial development and human society.This paper investigates and discusses the advantages control strategies for electric machines,including the field oriented control(FOC),direct torque control(DTC),finite control set model predictive control(FCS-MPC),sensorless control,and fault tolerant control(FTC).The corresponding control principles,control targets,fundamental approaches,advanced approaches,methodologies,merits and shortcomings are revealed and analyzed in detail.

关键词： electric machine permanent-magnet(PM)machine AC machine control strategy advanced control field oriented control(FOC) direct torque control(DTC) finite control set model predictive control(FCS-MPC) sensorless control and fault tolerant control(FTC)

Cogging Torque Sensitivity considering Imperfect Magnet Positioning for Permanent Magnet machines of Different Slot and Pole Count

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

CES Transactions on electrical machines and Systems 2020年第3期4卷 243-251页

作者： Gerd Bramerdorfer Edmund Marth Gereon Goldbeck Department of electrical Drives and Power Electronics Johannes Kepler University LinzAustria

This work is about analyzing surface mounted permanent magnet machines regarding their sensitiveness related to erroneous magnet positioning.A finite element analysis based approach is presented and different topologies in terms of slot and pole count are compared.The study further includes the analysis of multiple magnet widths and stator teeth widths.By contrast to most of previous studies,the work is based on evaluating the cumulative distribution function of the cogging torque in case of non-idealities.A Monte Carlo importance sampling based strategy is focused.This approach facilitates studying arbitrary tolerance distributions.Results reveal that topologies with particularly promising rated cogging torque behaviour exhibit the most significant performance degradation in presence of tolerances.A linear relationship is identified for cogging torque performance as function of the accuracy in magnet positioning.Results emphasize the necessity of tolerance analyses for electric machine design to not overrate their performance in the presence of manufacturing uncertainties.

关键词： cumulative distribution function electric machine Monte Carlo PMSM quantile sensitivity tolerance analysis

New Technical Trends on Adjustable Speed AC Motor Drives

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of electrical Engineering 2017年第1期3卷 1-9页

作者： Kouki Matsuse Daiki Matsuhashi Meiji University TokyoJapan Meidensha Corporation TokyoJapan

Adjustable speed AC Motor drives have been used extensively in modern industry and transportation which calls for electrical and mechanical energy conversion with wide output power range applications.Because of its modularity and scalability,the drive system can be extended to many different application areas.More recently,adjustable speed AC motor drive applications are spreading not only in industry applications,but also sky and the marine.In this paper,after summarizing the history of adjustable speed AC motor drives and applications,the main issues of AC drive technologies are reviewed and investigated in the paper.Technical issues of adjustable speed AC motor drives including its standardization are surveyed and analyzed for more advancement.Finally,the paper provides the latest technical trends on adjustable speed AC motor drives technologies,and discusses the development of high speed high power PM motor.

关键词： electric machine drive technology adjustable speed motor drive AC machine drive system Industry applications transportation application high speed PM motor

Optimization of Added Permanent Magnet Amount in Synchronous Reluctance machines for High Performance

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Tsinghua Science and Technology 1998年第3期3卷 87-92页

作者：赵争鸣

An optimizing method of adding permanent magnet into synchronous reluctance machines for high performance is presented. The method enables torque components from reluctance and permanent magnet to reach an optimal combination so as to obtain a maximum efficiency, higher power factor in a wider speed range. Capability curves of synchronous reluctance combined with permanent magnet (SR PM) machines are described for different quantities of permanent magnet. The interacting principle of reluctance and permanent magnet torque is discussed. Simulation results based on an integrated model of the SR PM machine with a controller are presented to demonstrate the interaction of the two kinds of torques. Particularly, efficiency contours over the capability curves are illustrated to show the effect of added permanent magnet amount. An optimizing criterion for added permanent magnet amount in SR PM machine design is developed. Compared to induction, pure synchronous reluctance, and non optimized SR PM machines with same stator, the optimized SR PM machine shows higher efficiency in a wider speed range. 

关键词： synchronous reluctance permanent magnet electric machine optimization