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Optimal Rotor Poles and Structure for Design of Consequent Pole Permanent Magnet Flux Switching machine

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Chinese Journal of Electrical Engineering 2021年第1期7卷 118-127页

作者： Wasiq Ullah Faisal Khan Muhammad Umair Department of Electrical and Computer Engineering COMSATS University Islamabad(Abbottabad Campus)Abbottabad 22040Pakistan

Permanent magnet flux switching machines(PMFSM)have attracted significant research interest and are considered as competent candidates when higher torque density is primary requirement.However,conventional PMFSMs uses excessive rare earth PM volumes which ultimately increases machine the machine weight and PM cost.Moreover,the PMs extended at the stator yoke results in stator leakage flux which degrades the performance.To suppress the leakage flux and diminish the PM volume,the consequent pole PMFSM(CPPMFSM)with flux bridges and barriers encompassing partitioned circumferential and radial magnetized PMs is proposed,thereby ensuring an alternate magnetic path for the working harmonics which improves the modulation effect and flux distribution.Moreover,the influence of the rotor pole number on seven different rotor structures namely,curved rotor,trapezoidal rotor,wide rotor tooth tip,wide rotor base width,rectangular segmented and eccentric rotors are investigated based on the electromagnetic performance and stress distribution.Finite element analysis(FEA)reveals that the 12S-13P CPPMFSM with a wider rotor base offers comparatively better electromagnetic performance.Compare to the conventional PMFSM,the proposed CPPMFSM reduces the PM volume which minimizes the overall machine cost and weight,suppresses the torque ripples by 16.49%,diminishes total harmonic distortion(THD)by 35.24%and decreases cogging torque by 32.88%.Furthermore,the torque and power density are enhanced by 7.028%and 7.025%respectively.

关键词： AC machine consequent pole flux bridge flux switching machine permanent magnet rotor pole number rotor structure stress analysis

Utility and Application of a Versatile Analytical Method for MMF Calculation in AC machines

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CES Transactions on Electrical machines and Systems 2024年第1期8卷 22-31页

作者： Ze-Zheng Wu Robert Nilssen Jian-Xin Shen IEEE the College of Electrical Engineering Zhejiang UniversityHangzhou 310027China the Department of Electric Energy Norwegian University of Science and TechnologyTrondheimNorwayand also affiliated with the College of Electrical EngineeringZhejiang UniversityHangzhou 310027China

A versatile analytical method(VAM) for calculating the harmonic components of the magnetomotive force(MMF) generated by diverse armature windings in AC machines has been proposed, and the versatility of this method has been established in early literature. However, its practical applications and significance in advancing the analysis of AC machines need further elaboration. This paper aims to complement VAM by augmenting its theory, offering additional insights into its conclusions, as well as demonstrating its utility in assessing armature windings and its application of calculating torque for permanent magnet synchronous machines(PMSM). This work contributes to advancing the analysis of AC machines and underscores the potential for improved design and performance optimization.

关键词： AC machine Analytical method Harmonic analysis MMF Magnetic field Torque calculation

New Technical Trends on Adjustable Speed ac Motor Drives

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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

Overview of Advanced Control Strategies for Electric machines

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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)