{"title":"Evaluation of Fractional Slot Concentrated Winding Permanent Magnet Synchronous Machine for Electric Vehicle Application","authors":"Anqing He, Chenxi Zhou, Xiaoyan Huang, Jian-Xin Shen, Youtong Fang, Q. Lu","doi":"10.1109/IEMDC.2019.8785223","DOIUrl":"https://doi.org/10.1109/IEMDC.2019.8785223","url":null,"abstract":"This paper mainly designed and compared the fractional slot concentrated winding (FSCW) permanent magnet synchronous motors (PMSMs) with different rotor topologies. To obtain higher peak torque with the constrain for cogging torque and torque ripple, three kinds of motors with different rotor topologies, including surface-mounted rotor, rectangular interior rotor and V-type interior rotor, are optimized using Maxwell. The optimized motors are further analyzed and compared with their electromagnetic performance at no load and its efficiency map. It turns out that higher peak torque can be achieved with surface-mounted rotor topology while V-type interior rotor has better performance in terms of efficiency map.","PeriodicalId":378634,"journal":{"name":"2019 IEEE International Electric Machines & Drives Conference (IEMDC)","volume":"224 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125818986","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Design and Analysis of a Bearingless Motor with Passive Axial Suspension Through Null-Flux Coils","authors":"Guilherme Cavalcante Rubio, A. Chiba","doi":"10.1109/IEMDC.2019.8785077","DOIUrl":"https://doi.org/10.1109/IEMDC.2019.8785077","url":null,"abstract":"This paper describes a bearingless motor with passive axial stabilization. Null-flux figure-8 coils are employed to generate passive restorative forces in the axial direction. Using Finite Element Analysis, passive suspension performance is compared between two proposed models, one with iron core structure and another one with a coreless stator. Analytical results show that the coreless model is more suited for the first prototype machine. This is part of a project that aims to achieve full passive suspension in a bearingless motor.","PeriodicalId":378634,"journal":{"name":"2019 IEEE International Electric Machines & Drives Conference (IEMDC)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125370496","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Position Sensing Induced Parasitic Torques in Permanent Magnet Synchronous Motor Drives","authors":"P. Pramod, K. Namburi, R. Mitra, A. Saha","doi":"10.1109/IEMDC.2019.8785401","DOIUrl":"https://doi.org/10.1109/IEMDC.2019.8785401","url":null,"abstract":"An analytical model for predicting the parasitic current and torque ripples generated in permanent magnet synchronous motor (PMSM) drives due to different types of errors or non-idealities in sine-cosine type position sensors is presented in this paper. The analytical models are extensively validated with simulation and experimental results on a practical PMSM drive.","PeriodicalId":378634,"journal":{"name":"2019 IEEE International Electric Machines & Drives Conference (IEMDC)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125414964","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Impacts of DFIG-Based Wind Power System on Migration Mechanism of Oscillation Center","authors":"Fei Tang, Jiale Liu, Dichen Liu, Fusuo Liu, Weiqiang Liang, Feifei Wang","doi":"10.1109/IEMDC.2019.8785329","DOIUrl":"https://doi.org/10.1109/IEMDC.2019.8785329","url":null,"abstract":"The safe and stable operation of the power system has become an increasingly critical issue as the large-scale of wind power integration and its long-distance transmission. Splitting control (or islanding control) of the power system is an important prevention measure to mitigate the system collapses. In general, the oscillation center (i.e. the point of which voltage is the lowest in the power gird) is applied to searching the splitting boundary. However, fast responses, low inertia, and asynchronous operation of the doubly fed induction generator (DFIG) might change the migration mechanism of oscillation centers. This paper tries to analyze the impact of DFIG characteristics on oscillation center migration. First, Thevenin equivalent circuit equation of DFIG is established, based on which the characteristic admittance of DFIG under out-of-step oscillation is analyzed. Then by substituting the characteristic admittance of DFIG into the oscillation center migration function, results manifest that the distribution range of the oscillation center is extended, and the splitting location keeps away from the point of common coupling (PCC). Finally, simulations on 2-area 4-machine system and IEEE 118-bus system integrated with wind farms verify the correctness and effectiveness of the theoretical analysis.","PeriodicalId":378634,"journal":{"name":"2019 IEEE International Electric Machines & Drives Conference (IEMDC)","volume":"117 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115456102","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
E. Pošković, L. Ferraris, F. Franchini, A. Cavagnino, M. Grande
{"title":"SMC Materials in Electrical Machine Prototypes","authors":"E. Pošković, L. Ferraris, F. Franchini, A. Cavagnino, M. Grande","doi":"10.1109/IEMDC.2019.8785066","DOIUrl":"https://doi.org/10.1109/IEMDC.2019.8785066","url":null,"abstract":"In the last years, innovative magnetic materials have been studied and developed for the production of electrical machines, using both permanent magnets and soft magnetic parts. NdFeB bonded magnets have been adopted in place of ferrite magnets, whereas powder based Soft Magnetic Composites, in the form of Insulated Iron Powder Compounds have started substituting the traditional laminated sheets. The use of SMCs allows different advantages concerning traditionally laminated steels; focusing on the energetic aspects, SMCs have lower eddy currents losses and present lower specific losses at medium and high frequencies. While Radial Flux Machines (RFM) can be made both with laminated sheets or SMC powders, in Axial Flux Machines (AFM) the use of Powder Metallurgy allows to obtain the highest efficiency with a (relatively) easy production process, particularly in terms of designing and realizing new complex shapes. Different typologies of electrical machines, both RFM and AFM, have been evaluated in the research, using in-house made SMC components. Several prototypes have been prepared using different types of SMCs: organic and inorganic layers, commercial products and powders developed in the laboratory. Interesting results have been obtained, particularly in terms of efficiency, and a detailed comparison among the different products has been made.","PeriodicalId":378634,"journal":{"name":"2019 IEEE International Electric Machines & Drives Conference (IEMDC)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122937941","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"New Double-Sided Wound Field Flux-Switching Linear Motor with Non-Overlapping Winding","authors":"R. Cao, Enchao Su","doi":"10.1109/IEMDC.2019.8785301","DOIUrl":"https://doi.org/10.1109/IEMDC.2019.8785301","url":null,"abstract":"Wound field flux-switching linear (WFFSL) motor has the advantages of high thrust force, small force ripple, no rare-earth magnet, wide operation range and low cost secondary. Hence, the WFFSL motor is ideal for rail transit and vertical hoist system which needs a long stator and a wide speed range. However, its field windings and armature windings are overlapping, which increases the end-winding length and copper loss. In order to further improve the performance of the motor, a new 12/7-pole double-sided WFFSL motor with nonoverlapping windings is proposed and investigated in this paper. The new topology and the operation principle of the proposed WFFSL motor are presented first. Second, the design rules, specification and the parameters of the proposed structure are listed. Then, the two motors are analyzed by using a finite element analysis (FEA) method. Finally, the electromagnetic performance of the double-sided motor and the single-sided motor have been compared and summarized. The results show that the new proposed motor has some merits such as larger thrust force density, smaller maximum normal force, less copper usage, higher efficiency and better heat dissipation.","PeriodicalId":378634,"journal":{"name":"2019 IEEE International Electric Machines & Drives Conference (IEMDC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129603131","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Principle of a Novel Dual-mode Reluctance Motor for Electric Vehicle Applications","authors":"K. Kiyota, Kosuke Ichiyanagi, K. Amei, T. Ohji","doi":"10.1109/IEMDC.2019.8785207","DOIUrl":"https://doi.org/10.1109/IEMDC.2019.8785207","url":null,"abstract":"This paper proposes a novel Dual-mode Reluctance Motor which can switch the motor mode between a switched reluctance motor and a synchronous reluctance motor to enhance the high efficiency region. It is found that the efficiency of a synchronous reluctance motor mode is high with respect to that of a switched reluctance motor mode in higher rotational speed and low power region because of the lower iron loss specification of the synchronous reluctance motor. This enhancement of the high efficiency region is suitable for electric vehicle application.","PeriodicalId":378634,"journal":{"name":"2019 IEEE International Electric Machines & Drives Conference (IEMDC)","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129478461","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Magnetic Field Prediction in Surface-Mounted PM Machines with Parallel Slot Based on a Nonlinear Subdomain and Magnetic Circuit Hybrid Model","authors":"Hao Yin, Lijian Wu, Yuting Zheng, Youtong Fang","doi":"10.1109/IEMDC.2019.8785318","DOIUrl":"https://doi.org/10.1109/IEMDC.2019.8785318","url":null,"abstract":"This paper proposes a nonlinear subdomain and magnetic circuit hybrid model (SMCHM) for surface-mounted permanent magnet (SPM) machines with parallel slot. The nonlinearity effect of stator is solved by introducing equivalent current sheets in the slot. The coupling position of this hybrid model is on the stator bore, and the magnetic field distributions in slots are calculated by magnetic circuit of SMCHM instead of subdomain model to reduce the error caused by approximation from sectorial slot to parallel slot. The accuracy of SMCHM for electromagnetic performance prediction is validated by finite element (FE) method.","PeriodicalId":378634,"journal":{"name":"2019 IEEE International Electric Machines & Drives Conference (IEMDC)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126659523","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jingchen Liang, Amir Parsapour, M. Moallem, B. Fahimi
{"title":"Asymmetric Rotor Surface Design in Interior Permanent Magnet Synchronous Motors for Torque Ripple Mitigation","authors":"Jingchen Liang, Amir Parsapour, M. Moallem, B. Fahimi","doi":"10.1109/IEMDC.2019.8785300","DOIUrl":"https://doi.org/10.1109/IEMDC.2019.8785300","url":null,"abstract":"Interior permanent magnet synchronous motors (IPMSMs) have broad applications due to their advantages of high torque and power densities. However, torque ripple in IPMSMs brings about undesired byproducts such as vibration and acoustic noise. This paper proposes an optimal asymmetric rotor surface design obtained by grid on/off search method to effectively reduce the torque ripple while maintaining/slightly increasing the average torque in an IPMSM. Genetic Algorithms (GA) has been applied to this method to achieve multi-objective optimization and to save simulation time. A two dimensional (2D) model is built in ANSYS Maxwell and has been analyzed using finite element method (FEM). Simulation results including flux distributions and forces acting on rotor surface, cogging torque, and total torque profiles are presented. Torque ripple of the optimal asymmetric design has been reduced by 77.46% while the average torque has remained unchanged as compared to the original design.","PeriodicalId":378634,"journal":{"name":"2019 IEEE International Electric Machines & Drives Conference (IEMDC)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126991404","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Accelerating Virtual Hotspots Analysis in Static Electromagnetic Devices","authors":"J. Wanjiku","doi":"10.1109/IEMDC.2019.8785211","DOIUrl":"https://doi.org/10.1109/IEMDC.2019.8785211","url":null,"abstract":"The trend in power conversion is smaller customizable nonstandard devices, in addition to risk mitigation in in-service and end-of-life devices. The reliability expected of power conversion devices, for example, transformers, requires hotspots analysis. Virtual prototypes are therefore important in this analysis, especially in cases where analytical-empirical models are difficult to apply. The main challenge in using virtual prototypes, in particular 3D models, is the long simulation time. Hence of little use in product development. By using advanced FEA capabilities, the simulation time can be reduced significantly. Productivity is increased, allowing the exploration of different designs to ensure product performance and reliability. This paper will introduce these FEA capabilities that are used to estimate the core, winding and structural hotspots in a single-phase distribution transformer.","PeriodicalId":378634,"journal":{"name":"2019 IEEE International Electric Machines & Drives Conference (IEMDC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130680169","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}