Iet Electric Power Applications最新文献_第3页

Active noise control by means of high frequency injection in electric motors 通过高频喷射对电机进行主动噪音控制

IF 1.5 4区工程技术

Iet Electric Power Applications Pub Date : 2024-04-29 DOI: 10.1049/elp2.12442

Stefanos Skoulaxinos, Pat Wheeler, Gaurang Vakil

引用次数: 0

Impact of magnet shape and material on the magnet stress 磁体形状和材料对磁体应力的影响

IF 1.5 4区工程技术

Iet Electric Power Applications Pub Date : 2024-04-25 DOI: 10.1049/elp2.12434

Li Cao, Yan Hu, Bohan Wang, Wenkun Wu, Daolong Shi, Liang Zhuo

引用次数: 0

Core loss determination in electric machines using short-time transient thermal measurements 利用短时瞬态热测量确定电机的铁芯损耗

IF 1.5 4区工程技术

Iet Electric Power Applications Pub Date : 2024-04-25 DOI: 10.1049/elp2.12437

Osaruyi Osemwinyen, Ahmed Hemeida, Floran Martin, Ismet Tuna Gürbüz, Anouar Belahcen

引用次数: 0

Derivation of transformer winding equivalent circuit by employing the transfer function obtained from frequency response analysis data 利用频率响应分析数据获得的传递函数推导变压器绕组等效电路

IF 1.5 4区工程技术

Iet Electric Power Applications Pub Date : 2024-04-22 DOI: 10.1049/elp2.12436

Zhi Zhang

{"title":"Derivation of transformer winding equivalent circuit by employing the transfer function obtained from frequency response analysis data","authors":"Zhi Zhang","doi":"10.1049/elp2.12436","DOIUrl":"10.1049/elp2.12436","url":null,"abstract":"Precisely interpreting frequency response analysis (FRA) curves is crucial when investigating mechanical malfunctions in power transformer windings (TWs). However, many conventional explanations of FRA features cannot be validated by an equivalent circuit (EC) that represents winding structures using resistance, inductance, and capacitance components in a ladder network. Incorrect interpretation can lead to misdiagnosis and confusion in asset management. Previous ECs are often proposed by analysing winding structures without rigorous verification compared to the corresponding FRA data. The specific EC is acquired using the transfer function (TF) derived from the measured FRA data. This allows for the establishment of the relationship between TW FRA curves, TF equations, and EC topologies. The precise interpretation of FRA curves can be achieved by closely observing the FRA curves created from TFs and ECs. The remarkable similarity between the measured and modelled FRA curves verifies the authenticity of the derived ECs. This significant achievement clarifies many misunderstandings regarding FRA and represents a substantial advancement in FRA technology.","PeriodicalId":13352,"journal":{"name":"Iet Electric Power Applications","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2024-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/elp2.12436","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140674337","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Co‐excitation control of a four‐degree‐of‐freedom magnetic bearing switched reluctance motor based on mathematical models 基于数学模型的四自由度磁轴承开关磁阻电机共励磁控制

IF 1.7 4区工程技术

Iet Electric Power Applications Pub Date : 2024-04-11 DOI: 10.1049/elp2.12433

Zeyuan Liu, Xingcheng Wu, Jun Cai, Yan Yang, Chengzi Liu

{"title":"Co‐excitation control of a four‐degree‐of‐freedom magnetic bearing switched reluctance motor based on mathematical models","authors":"Zeyuan Liu, Xingcheng Wu, Jun Cai, Yan Yang, Chengzi Liu","doi":"10.1049/elp2.12433","DOIUrl":"https://doi.org/10.1049/elp2.12433","url":null,"abstract":"In traditional magnetic bearing motors, the magnetic bearing and the motor are usually driven and controlled separately, resulting in higher controller costs and limiting further expansion of their applications. The author presents a four‐degree‐of‐freedom (4DOF) magnetic bearing switched reluctance motor (MBSRM), consisting of two 8‐pole active radial magnetic bearings (RMBs) and two two‐phase 4/2‐pole switched reluctance motors (SRMs), driven simultaneously by a set of asymmetrical power converters together. Firstly, the structure, winding configuration and co‐excitation working principles of the 4DOF‐MBSRM system are described in detail. Then the radial force formula for an 8‐pole RMB and the torque mathematical model for a 4/2‐pole SRM are briefly derived based on equivalent magnetic circuits, respectively. Furthermore, a co‐excitation control strategy for the 4DOF MBSRM is developed wherein an instantaneous radial force is used to control its rotor shaft levitation, an instantaneous torque is employed for rotational control at low and medium speeds, and an average torque is used for high speed operation. Finally, the good performance of the co‐excitation control for the proposed 4DOF‐MBSRM is proved by simulation analysis.","PeriodicalId":13352,"journal":{"name":"Iet Electric Power Applications","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140713550","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Vibration characteristics of a single-phase four-column auto-transformer core excited by geomagnetically induced currents 地磁感应电流激发的单相四柱式自动变压器铁芯的振动特性

IF 1.5 4区工程技术

Iet Electric Power Applications Pub Date : 2024-04-05 DOI: 10.1049/elp2.12430

Wenkai Xin, Chunming Liu, Guyue Wang, Ruopu Zhan, Bing Li, Zezhong Wang

{"title":"Vibration characteristics of a single-phase four-column auto-transformer core excited by geomagnetically induced currents","authors":"Wenkai Xin, Chunming Liu, Guyue Wang, Ruopu Zhan, Bing Li, Zezhong Wang","doi":"10.1049/elp2.12430","DOIUrl":"10.1049/elp2.12430","url":null,"abstract":"During geomagnetic storms, geomagnetically induced currents (GICs) occur in the power grid. GIC is a quasi-direct current, which is represented by using a fixed DC current, the authors propose an approach that combines field-circuit-coupled and weakly coupled magneto-mechanical models to investigate the magnetostriction characteristics of single-phase, four-column autotransformer cores excited by GICs. A non-linear magnetostrictive constitutive model that considers the impact of stress and magnetisation intensity on ferromagnetic materials is introduced. The model reveals that the strain in the core initially increases as the magnetisation intensity increases; however, when the core begins to saturate, the magnetostrictive strain weakens as the magnetisation intensity increases. Moreover, the results of multiphysics finite-element modelling are experimentally verified using a direct current bias platform. The results show that when excited by GICs, there is an enhancement in the vibration of the iron core, and the harmonic content of the vibration acceleration increases considerably, with the odd harmonics most significantly increasing in amplitude. The conclusion drawn is that GICs can exacerbate transformer vibration and significantly increase the content of harmonics, especially odd harmonics.","PeriodicalId":13352,"journal":{"name":"Iet Electric Power Applications","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2024-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/elp2.12430","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140738764","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Multi-objective hierarchical optimisation design and experimental verification of an alterable-magnetic-circuit variable-flux memory machine 可变磁路可变流量记忆机的多目标分层优化设计与实验验证

IF 1.5 4区工程技术

Iet Electric Power Applications Pub Date : 2024-04-01 DOI: 10.1049/elp2.12431

Shukuan Zhang, Fachen Wang, Jingwei Zhu, Ping Zheng, Guangwei Liu

{"title":"Multi-objective hierarchical optimisation design and experimental verification of an alterable-magnetic-circuit variable-flux memory machine","authors":"Shukuan Zhang, Fachen Wang, Jingwei Zhu, Ping Zheng, Guangwei Liu","doi":"10.1049/elp2.12431","DOIUrl":"10.1049/elp2.12431","url":null,"abstract":"Rare-earth permanent magnet synchronous machines face challenges in manipulating their magnetic fields, which hinders the ability to extend the operation speed range. Moreover, this inflexibility leads to reduced efficiency in high-speed scenarios when the machine is under flux-weakening control and increases the risk of the magnets becoming demagnetised. The authors propose an alterable-magnetic-circuit variable-flux memory machine (AMC-VFMM) and a multi-objective hierarchical optimisation method is conducted to optimise the machine. Firstly, the topology and alterable-magnetic-circuit principle of the proposed AMC-VFMM are introduced. Then, optimisation objectives including torque production capability, flux regulation capability, and resisting unintentional demagnetisation capability are defined, and the hierarchical optimisation approach is established by stratifying the optimisation objectives and variables through the sensitivity analysis. Finite element analysis indicates that electromagnetic performances of the optimised design scheme are significantly enhanced. The bench test of the prototype demonstrates the superiority of the proposed AMC-VFMM and validates the effectiveness of the optimisation design method.","PeriodicalId":13352,"journal":{"name":"Iet Electric Power Applications","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/elp2.12431","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140766420","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Primary component segmental design to suppress the normal force ripple for the permanent magnet linear synchronous motor 用于抑制永磁直线同步电机法向力纹波的主元件分段设计

IF 1.5 4区工程技术

Iet Electric Power Applications Pub Date : 2024-04-01 DOI: 10.1049/elp2.12428

Qiang Tan, Bing Tian, Xinbang Wang, Xuzhen Huang, Liyi Li

{"title":"Primary component segmental design to suppress the normal force ripple for the permanent magnet linear synchronous motor","authors":"Qiang Tan, Bing Tian, Xinbang Wang, Xuzhen Huang, Liyi Li","doi":"10.1049/elp2.12428","DOIUrl":"10.1049/elp2.12428","url":null,"abstract":"There is not only thrust but also normal force between the primary and secondary components for the single-side flat plate permanent magnet linear synchronous motor (PMLSM). The normal force will fluctuate periodically, which will cause friction perturbation and finally affect the positioning accuracy of linear feed system. For the single-side flat plate PMLSM, the variation law of normal force ripple under the coupling effect of multiple effects is studied, and the method of primary component segmental design to suppress it is proposed. Firstly, the influence of the cogging effect, the end effect and the armature reaction on the normal force ripple is analysed. Meanwhile the mathematical model of normal force ripple is established. Secondly, the PMLSM with segmental primary component is introduced and its suppression mechanism to the normal force ripple is expounded. On this basis, a scheme combining the non-integer pole slot matching with the primary component segmental design is proposed to further suppress the normal force ripple. Finally, an 18-slot 96/5-pole prototype is taken as an example to carry out the finite element simulation and experimental test, of which the results verify the research theory in this paper.","PeriodicalId":13352,"journal":{"name":"Iet Electric Power Applications","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/elp2.12428","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140781652","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Semi-flooded cooling for high torque density modular permanent magnet machines 用于高扭矩密度模块式永磁电机的半淹没式冷却系统

IF 1.5 4区工程技术

Iet Electric Power Applications Pub Date : 2024-04-01 DOI: 10.1049/elp2.12432

W. Zhang, G. J. Li, Z. Q. Zhu, B. Ren, Y. C. Chong

{"title":"Semi-flooded cooling for high torque density modular permanent magnet machines","authors":"W. Zhang, G. J. Li, Z. Q. Zhu, B. Ren, Y. C. Chong","doi":"10.1049/elp2.12432","DOIUrl":"https://doi.org/10.1049/elp2.12432","url":null,"abstract":"The authors investigate a semi-flooded cooling technology for modular permanent magnet machines using flux gaps (FGs) in alternate stator teeth for extra cooling channels. The investigated machine is separated into stationary and rotational components by a polyether ether ketone sleeve. Liquid is directed into the stationary component to achieve a significant temperature reduction, at the same time, avoiding the liquid leakage into the rotating component that will cause an increase in friction losses. The FGs in the modular machine increase the contact area between coolant and machine components, resulting in better cooling efficiency. Furthermore, the FGs contribute to reduced pressure loss by minimising system flow resistance. The influence of the FG width on improving machine cooling efficiency, lowering machine temperature, and reducing pressure losses is delved. Additionally, the investigation considers the impact of inlet and outlet areas to reveal the influences stemming from fluid expansions and contractions in these regions. Computational fluid dynamics (CFD) modelling is employed to simulate the cooling performances of the investigated machines. In addition, the flow network analysis has also been employed to help understand the fluid behaviour within machines. A series of tests have been carried out to validate the CFD modelling.","PeriodicalId":13352,"journal":{"name":"Iet Electric Power Applications","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/elp2.12432","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141624337","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Robust flux angle control of induction motors to improve efficiency at light loads 感应电机的稳健磁通角控制，提高轻负载时的效率

IF 1.5 4区工程技术

Iet Electric Power Applications Pub Date : 2024-03-27 DOI: 10.1049/elp2.12427

Mohammad Reza Mohebbi, Davood Arab Khaburi

{"title":"Robust flux angle control of induction motors to improve efficiency at light loads","authors":"Mohammad Reza Mohebbi, Davood Arab Khaburi","doi":"10.1049/elp2.12427","DOIUrl":"10.1049/elp2.12427","url":null,"abstract":"Vector control of induction motors has provided us with both good performance and acceptable efficiency at rated loads. Using this method at light loads reduces the efficiency due to the adjustment of motor flux at the rated value. Electric motors are normally used even at lower loads than the rated ones and often selected oversized. Enhancing the efficiency of induction motors at light loads will significantly reduce electric energy consumption. A novel method called Flux Angle Control (FAC) of the induction motor is presented to improve efficiency in the steady state at light loads. To increase the accuracy of the induction motor model we consider iron losses. This method controls the angle between the stator flux (stator current) and the d-axis (rotor flux direction). The primary aim of the flux angle control method is to reduce the flux level and increase the flux angle at light loads. The optimal flux angle is sensitive to some induction motor parameters. The proposed method offers several advantages compared to similar methods, including high efficiency, minimal sensitivity of the optimal flux angle to changes in motor parameters, a reduced number of calculations, and easy implementation. The validity of this method is examined through experiments.","PeriodicalId":13352,"journal":{"name":"Iet Electric Power Applications","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2024-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/elp2.12427","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140375195","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0