Pub Date : 2021-05-17DOI: 10.1109/IEMDC47953.2021.9449536
James Swanke, Hao Zeng, Dheeraj Bobba, T. Jahns, B. Sarlioglu
High-power-density megawatt-scale surface permanent magnet (SPM) machines are strong candidates for future aircraft electric propulsion applications. Additional power density and fault tolerance benefits can be gained by designing the machine as an Integrated Modular Motor Drive (IMMD) that breaks the machine into multiple three-phase modules, each with its own dedicated power electronics. This paper discusses development of a 1 MW SPM machine for an IMMD configuration with a rated speed of 20,000 rev/min. A lower-power demonstrator version of this machine (200 kW) has been built to retire key technical risks and to validate machine models for the final design. The materials, components, and performance of this demonstrator machine are reviewed. The machine test configuration is described, and initial test results are presented that exhibit promising agreement with performance predictions provided by simulations and analytical models. Finally, fault tolerance benefits of the modular stator design are experimentally demonstrated.
{"title":"Design and Testing of a Modular High-Speed Permanent-Magnet Machine for Aerospace Propulsion","authors":"James Swanke, Hao Zeng, Dheeraj Bobba, T. Jahns, B. Sarlioglu","doi":"10.1109/IEMDC47953.2021.9449536","DOIUrl":"https://doi.org/10.1109/IEMDC47953.2021.9449536","url":null,"abstract":"High-power-density megawatt-scale surface permanent magnet (SPM) machines are strong candidates for future aircraft electric propulsion applications. Additional power density and fault tolerance benefits can be gained by designing the machine as an Integrated Modular Motor Drive (IMMD) that breaks the machine into multiple three-phase modules, each with its own dedicated power electronics. This paper discusses development of a 1 MW SPM machine for an IMMD configuration with a rated speed of 20,000 rev/min. A lower-power demonstrator version of this machine (200 kW) has been built to retire key technical risks and to validate machine models for the final design. The materials, components, and performance of this demonstrator machine are reviewed. The machine test configuration is described, and initial test results are presented that exhibit promising agreement with performance predictions provided by simulations and analytical models. Finally, fault tolerance benefits of the modular stator design are experimentally demonstrated.","PeriodicalId":106489,"journal":{"name":"2021 IEEE International Electric Machines & Drives Conference (IEMDC)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133641727","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}
Pub Date : 2021-05-17DOI: 10.1109/IEMDC47953.2021.9449572
Ivano Cornacchia, G. Pilla, Baptiste Chareyron, G. Bruneaux, S. Kaiser, Adèle Poubeau
Efficient thermal management of electric motors is essential for competitive electric mobility. The end-windings are a critical part of the motor, in terms of thermal management. Their cooling can be improved by injecting transmission oil. In the design of such cooling systems, the convective coefficient is an important parameter for quantifying heat transfer towards the liquid. In this study, oil injection on a flat heated plate is used as a model experiment to replicate such cooling and characterize convective heat transfer. Embedded thermocouples measure the temperature at different depths in the plate. The convection coefficient is estimated via different experimental and numerical methods. The methods developed consent to evaluate the coefficient within 20 times the nozzle distance. Values up to 7550W/m2K are obtained nearby the impingement point.
{"title":"Development of an Experimental Methodology to Characterize Liquid Cooling Systems for Electric Motors","authors":"Ivano Cornacchia, G. Pilla, Baptiste Chareyron, G. Bruneaux, S. Kaiser, Adèle Poubeau","doi":"10.1109/IEMDC47953.2021.9449572","DOIUrl":"https://doi.org/10.1109/IEMDC47953.2021.9449572","url":null,"abstract":"Efficient thermal management of electric motors is essential for competitive electric mobility. The end-windings are a critical part of the motor, in terms of thermal management. Their cooling can be improved by injecting transmission oil. In the design of such cooling systems, the convective coefficient is an important parameter for quantifying heat transfer towards the liquid. In this study, oil injection on a flat heated plate is used as a model experiment to replicate such cooling and characterize convective heat transfer. Embedded thermocouples measure the temperature at different depths in the plate. The convection coefficient is estimated via different experimental and numerical methods. The methods developed consent to evaluate the coefficient within 20 times the nozzle distance. Values up to 7550W/m2K are obtained nearby the impingement point.","PeriodicalId":106489,"journal":{"name":"2021 IEEE International Electric Machines & Drives Conference (IEMDC)","volume":"166 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132382631","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}
Pub Date : 2021-05-17DOI: 10.1109/IEMDC47953.2021.9449520
F. Nishanth, M. Johnson, E. Severson
Power dense electric machines are highly desirable for applications such as electrified transportation systems. One of the factors limiting the achievable power density of electric machines is the thermal management system. In the absence of suitable thermal management systems, the electric machine losses can lead to insulation failure, inter-turn short circuits, de-magnetization of the permanent magnets, and finally drive system failure. Therefore, analyzing the losses in the machine and identifying a suitable thermal management system is essential to realize power dense electric machines. In this paper, thermal analysis techniques applied to electric machines are first reviewed, and their relative merits and demerits are identified. The thermal considerations in electric machine design are discussed. Once the electric machine is thermally analyzed, the next step is to identify or design a suitable thermal management system. The subsequent sections of this paper provide a detailed review of thermal management systems reported in literature for cooling electric machines, with a focus on high power density designs across different application scenarios. Finally, an analysis is presented that demonstrates how the physics of the machine can be used to determine the stator current density limits.
{"title":"A Review of Thermal Analysis and Management of Power Dense Electric Machines","authors":"F. Nishanth, M. Johnson, E. Severson","doi":"10.1109/IEMDC47953.2021.9449520","DOIUrl":"https://doi.org/10.1109/IEMDC47953.2021.9449520","url":null,"abstract":"Power dense electric machines are highly desirable for applications such as electrified transportation systems. One of the factors limiting the achievable power density of electric machines is the thermal management system. In the absence of suitable thermal management systems, the electric machine losses can lead to insulation failure, inter-turn short circuits, de-magnetization of the permanent magnets, and finally drive system failure. Therefore, analyzing the losses in the machine and identifying a suitable thermal management system is essential to realize power dense electric machines. In this paper, thermal analysis techniques applied to electric machines are first reviewed, and their relative merits and demerits are identified. The thermal considerations in electric machine design are discussed. Once the electric machine is thermally analyzed, the next step is to identify or design a suitable thermal management system. The subsequent sections of this paper provide a detailed review of thermal management systems reported in literature for cooling electric machines, with a focus on high power density designs across different application scenarios. Finally, an analysis is presented that demonstrates how the physics of the machine can be used to determine the stator current density limits.","PeriodicalId":106489,"journal":{"name":"2021 IEEE International Electric Machines & Drives Conference (IEMDC)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134142809","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}
Pub Date : 2021-05-17DOI: 10.1109/IEMDC47953.2021.9449538
S. Dai, Jiabin Wang, Zhigang Sun, E. Chong
By employing offline optimized pulse patterns (OPPs), synchronous optimal modulation (SOM) can achieve minimum current total harmonic distortion (THD) in high-speed PMSM drives when switching-to-fundamental frequency ratio is low. However, the pulse pattern optimization can be very time consuming and has to be tailored for each high-speed drive. This paper presents an improved gradient-based optimization algorithm for SOM of high-speed PMSM drives. It incorporates analytical gradients of the nonlinear constraints, and employs both predictive and random initial values in two steps of optimizations. The proposed method can greatly reduce the computation time of the OPPs and avoid tedious and complex re-optimizations as required in conventional methods. Additionally, based on the optimization results, the total harmonic currents of a high-speed PMSM drive with SOM in real-time control can be predicted, which can serve as an efficient performance evaluation tool. The numerical optimization results, extensive time-domain simulation and experiment results on a prototype high-speed PMSM drive have been obtained and the effectiveness of the proposed method validated.
{"title":"An Improved Gradient-Based Optimization Algorithm for Synchronous Optimal Modulation of High-Speed PMSM Drives","authors":"S. Dai, Jiabin Wang, Zhigang Sun, E. Chong","doi":"10.1109/IEMDC47953.2021.9449538","DOIUrl":"https://doi.org/10.1109/IEMDC47953.2021.9449538","url":null,"abstract":"By employing offline optimized pulse patterns (OPPs), synchronous optimal modulation (SOM) can achieve minimum current total harmonic distortion (THD) in high-speed PMSM drives when switching-to-fundamental frequency ratio is low. However, the pulse pattern optimization can be very time consuming and has to be tailored for each high-speed drive. This paper presents an improved gradient-based optimization algorithm for SOM of high-speed PMSM drives. It incorporates analytical gradients of the nonlinear constraints, and employs both predictive and random initial values in two steps of optimizations. The proposed method can greatly reduce the computation time of the OPPs and avoid tedious and complex re-optimizations as required in conventional methods. Additionally, based on the optimization results, the total harmonic currents of a high-speed PMSM drive with SOM in real-time control can be predicted, which can serve as an efficient performance evaluation tool. The numerical optimization results, extensive time-domain simulation and experiment results on a prototype high-speed PMSM drive have been obtained and the effectiveness of the proposed method validated.","PeriodicalId":106489,"journal":{"name":"2021 IEEE International Electric Machines & Drives Conference (IEMDC)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125630224","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}
Pub Date : 2021-05-17DOI: 10.1109/IEMDC47953.2021.9449500
Jialou Gao, Boyang Li, Dong Jiang, Min Zhou
The power level of on-board charger (OBC) is limited by its cost and space occupation. Although the power density of OBC can be improved by system integration or applying wide bandgap power semiconductor device, the power level is still limited to 22 kW. Using the drivetrain of EV to constitute the AC/DC rectifier stage of OBC can save “half” the space of OBC. Therefore, the OBC will only need isolated DC/DC converter stage so that the power level will be improved a lot. The crux of integrated motor drive and charger system (IMDCS) is how to eliminate the motor torque in charging mode. This paper reviews and compares the existing torque cancellation methods. Furthermore, the essences of those methods are analyzed and classified. Finally, simulations and experiments results are used to verify the point of this paper.
{"title":"Review of Torque Cancellation Methods for Integrated Motor Drive and Charger System","authors":"Jialou Gao, Boyang Li, Dong Jiang, Min Zhou","doi":"10.1109/IEMDC47953.2021.9449500","DOIUrl":"https://doi.org/10.1109/IEMDC47953.2021.9449500","url":null,"abstract":"The power level of on-board charger (OBC) is limited by its cost and space occupation. Although the power density of OBC can be improved by system integration or applying wide bandgap power semiconductor device, the power level is still limited to 22 kW. Using the drivetrain of EV to constitute the AC/DC rectifier stage of OBC can save “half” the space of OBC. Therefore, the OBC will only need isolated DC/DC converter stage so that the power level will be improved a lot. The crux of integrated motor drive and charger system (IMDCS) is how to eliminate the motor torque in charging mode. This paper reviews and compares the existing torque cancellation methods. Furthermore, the essences of those methods are analyzed and classified. Finally, simulations and experiments results are used to verify the point of this paper.","PeriodicalId":106489,"journal":{"name":"2021 IEEE International Electric Machines & Drives Conference (IEMDC)","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124200289","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}
Pub Date : 2021-05-17DOI: 10.1109/IEMDC47953.2021.9449560
C. Bianchini, A. Torreggiani, M. Davoli, Danilo David, Andrea Sala, A. Bellini
The linear induction motor is mainly adopted for traction or motion transmission applications. Some advantages of linear induction motors are: a direct electromagnetic thrust propulsion (no need of mechanical transmissions), low maintenance costs and precision linear positioning; on the other hand, this motor topology has low power factor and efficiency, longitudinal and transversal edge-effect. This paper proposes a novel fast simulation method to evaluate the performance and machine parameters of a double-sided linear induction motor via 2-D finite element analysis considering both a magnetic time-harmonic and magnetostatic problems. The thrust force is computed tuning the secondary aluminum plate resistivity as a function of the path length of the induced eddy currents due to the fundamental of the air gap magnetomotive force. The proposed method has been verified via several 2-D finite element simulations and validated with experimental tests.
{"title":"High Air Gap Linear Induction Motor Fast Simulation","authors":"C. Bianchini, A. Torreggiani, M. Davoli, Danilo David, Andrea Sala, A. Bellini","doi":"10.1109/IEMDC47953.2021.9449560","DOIUrl":"https://doi.org/10.1109/IEMDC47953.2021.9449560","url":null,"abstract":"The linear induction motor is mainly adopted for traction or motion transmission applications. Some advantages of linear induction motors are: a direct electromagnetic thrust propulsion (no need of mechanical transmissions), low maintenance costs and precision linear positioning; on the other hand, this motor topology has low power factor and efficiency, longitudinal and transversal edge-effect. This paper proposes a novel fast simulation method to evaluate the performance and machine parameters of a double-sided linear induction motor via 2-D finite element analysis considering both a magnetic time-harmonic and magnetostatic problems. The thrust force is computed tuning the secondary aluminum plate resistivity as a function of the path length of the induced eddy currents due to the fundamental of the air gap magnetomotive force. The proposed method has been verified via several 2-D finite element simulations and validated with experimental tests.","PeriodicalId":106489,"journal":{"name":"2021 IEEE International Electric Machines & Drives Conference (IEMDC)","volume":"136 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115948180","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}
Pub Date : 2021-05-17DOI: 10.1109/IEMDC47953.2021.9449505
Kotb B. Tawfiq, M. Ibrahim, E. El-Kholy, P. Sergeant
This paper analyses the performance of a high reliability multiphase electric drive system. The drive system consists of a five-phase synchronous reluctance machine (SynRM) connected to a three to five-phase matrix converter (MC). In this system, there is no vulnerable electrolytic DC-link capacitors, which considered a point of failure in conventional electric drive systems. The indirect space vector modulation (SVM) is used to control the five-phase MC. Indirect SVM deals with the five-phase MC as a virtual two-stage converter consisting of a virtual DC link, a virtual rectifier stage and a virtual inverter stage. In addition, a modified closed loop field-oriented control based on the indirect SVM is proposed to control the five-phase SynRM. The performance of the drive system is analyzed at different operating conditions.
本文分析了一种高可靠性多相电驱动系统的性能。驱动系统由一个五相同步磁阻电机(SynRM)连接到一个三到五相矩阵变换器(MC)。在这个系统中，没有易损坏的电解直流链路电容器，这在传统的电力驱动系统中被认为是一个故障点。采用间接空间矢量调制(indirect space vector modulation, SVM)对五相混合电源进行控制。间接空间矢量调制将五相混合电源作为虚拟两级变换器，由虚拟直流链路、虚拟整流级和虚拟逆变级组成。此外，提出了一种基于间接支持向量机的改进闭环面向场控制方法来控制五相SynRM。分析了驱动系统在不同工况下的性能。
{"title":"Performance Analysis of a Five-phase Synchronous Reluctance Motor Connected to Matrix Converter","authors":"Kotb B. Tawfiq, M. Ibrahim, E. El-Kholy, P. Sergeant","doi":"10.1109/IEMDC47953.2021.9449505","DOIUrl":"https://doi.org/10.1109/IEMDC47953.2021.9449505","url":null,"abstract":"This paper analyses the performance of a high reliability multiphase electric drive system. The drive system consists of a five-phase synchronous reluctance machine (SynRM) connected to a three to five-phase matrix converter (MC). In this system, there is no vulnerable electrolytic DC-link capacitors, which considered a point of failure in conventional electric drive systems. The indirect space vector modulation (SVM) is used to control the five-phase MC. Indirect SVM deals with the five-phase MC as a virtual two-stage converter consisting of a virtual DC link, a virtual rectifier stage and a virtual inverter stage. In addition, a modified closed loop field-oriented control based on the indirect SVM is proposed to control the five-phase SynRM. The performance of the drive system is analyzed at different operating conditions.","PeriodicalId":106489,"journal":{"name":"2021 IEEE International Electric Machines & Drives Conference (IEMDC)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116922948","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}
Pub Date : 2021-05-17DOI: 10.1109/IEMDC47953.2021.9449492
L. Di Leonardo, Mircea Popescu, M. Tursini
This paper presents a transient mathematical model for induction motors based on space harmonics and saturation effects. The model is based on the calculation of the phase-linked magnetic flux accounting for the geometry and physical dimensions of the stator and rotor windings, other than the magnetic steel saturation characteristic. The space-harmonic components of the magnetic induction are calculated at each time-step considering the currents in the stator windings and in the rotor bars as well as the rotor position. The electromagnetic torque is computed as well. The model is validated by comparison with a co-simulation approach that uses finite element calculus in transient mode. Method accuracy and effects of simplifications are investigated both in static and transient behavior. The case study and the presented results refer to a prototypal induction motor for high power electric vehicles.
{"title":"Transient Modeling of Induction Motors considering Space Harmonics and Saturation Effects","authors":"L. Di Leonardo, Mircea Popescu, M. Tursini","doi":"10.1109/IEMDC47953.2021.9449492","DOIUrl":"https://doi.org/10.1109/IEMDC47953.2021.9449492","url":null,"abstract":"This paper presents a transient mathematical model for induction motors based on space harmonics and saturation effects. The model is based on the calculation of the phase-linked magnetic flux accounting for the geometry and physical dimensions of the stator and rotor windings, other than the magnetic steel saturation characteristic. The space-harmonic components of the magnetic induction are calculated at each time-step considering the currents in the stator windings and in the rotor bars as well as the rotor position. The electromagnetic torque is computed as well. The model is validated by comparison with a co-simulation approach that uses finite element calculus in transient mode. Method accuracy and effects of simplifications are investigated both in static and transient behavior. The case study and the presented results refer to a prototypal induction motor for high power electric vehicles.","PeriodicalId":106489,"journal":{"name":"2021 IEEE International Electric Machines & Drives Conference (IEMDC)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122725252","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}
Pub Date : 2021-05-17DOI: 10.1109/IEMDC47953.2021.9449553
S. Kuruppu
Permanent magnet synchronous machines (PMSM) are widely utilized in applications demanding high torque output and torque density. Among them are hybrid electric powertrain and electric power steering (EPS) systems used in the transportation sector. Field oriented control (FOC), is one of the preferred methods of control for PMSMs due to the unique advantages. Accurate rotor position measurement is of paramount importance for proper field-oriented control of PMSMs. The relative angle offset between the position sensor zero and rotor zero is a key calibration for each PMSM drive system. However, calibration of the position sensor while the machine is in the system is a challenging problem. Certain powertrain architectures and EPSs with dual machines, facilitate the driving of one machine with the other. This paper proposes a unique approach to calibrate the position sensor offset of a PMSM system, while in-system, in machine-drive architectures that allow in-system rotation of the machine needing calibration with another actuator (i.e. internal combustion engine or second electric machine in dual wound machines). Analysis, simulation, and experimental results are provided that validates the proposed method.
{"title":"In-System Calibration of Position Sensor Offset in PMSM Drives","authors":"S. Kuruppu","doi":"10.1109/IEMDC47953.2021.9449553","DOIUrl":"https://doi.org/10.1109/IEMDC47953.2021.9449553","url":null,"abstract":"Permanent magnet synchronous machines (PMSM) are widely utilized in applications demanding high torque output and torque density. Among them are hybrid electric powertrain and electric power steering (EPS) systems used in the transportation sector. Field oriented control (FOC), is one of the preferred methods of control for PMSMs due to the unique advantages. Accurate rotor position measurement is of paramount importance for proper field-oriented control of PMSMs. The relative angle offset between the position sensor zero and rotor zero is a key calibration for each PMSM drive system. However, calibration of the position sensor while the machine is in the system is a challenging problem. Certain powertrain architectures and EPSs with dual machines, facilitate the driving of one machine with the other. This paper proposes a unique approach to calibrate the position sensor offset of a PMSM system, while in-system, in machine-drive architectures that allow in-system rotation of the machine needing calibration with another actuator (i.e. internal combustion engine or second electric machine in dual wound machines). Analysis, simulation, and experimental results are provided that validates the proposed method.","PeriodicalId":106489,"journal":{"name":"2021 IEEE International Electric Machines & Drives Conference (IEMDC)","volume":"308 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123144564","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}
Pub Date : 2021-05-17DOI: 10.1109/IEMDC47953.2021.9449609
W. Zhang, G. Li, Z. Zhu, B. Ren, M. Michon
This paper presents the global optimization of modular surface-mounted permanent magnet machines considering the effect of stator modularity on machine electromagnetic performances. In order to optimize the electromagnetic performance, the multi-objective genetic algorithm is adopted and 2D finite element method is used. Variables such as stator yoke height, tooth width, flux gap width, split ratio and rotor yoke thickness have been selected for the optimization. The objectives are to achieve maximized average torque, minimized torque ripple, copper loss and total machine mass. Amongst all the variables, the flux gap width is a key parameter which has significant impact on machine electromagnetic performance, but has not been included in the optimization process in the literature. The results in this paper have shown that considering the flux gap width in the optimization will lead to further improvement in machine electromagnetic performance. In addition, for machines with lower slot number than rotor pole number, the optimization process shows that an appropriate flux gap width is needed for optimal electromagnetic performance. However, for machines with higher slot number than pole number, the flux gap width tends to be zero, leading to non-modular machine having the optimal performance.
{"title":"Optimization of Modular SPM Machines Considering Stator Modularity","authors":"W. Zhang, G. Li, Z. Zhu, B. Ren, M. Michon","doi":"10.1109/IEMDC47953.2021.9449609","DOIUrl":"https://doi.org/10.1109/IEMDC47953.2021.9449609","url":null,"abstract":"This paper presents the global optimization of modular surface-mounted permanent magnet machines considering the effect of stator modularity on machine electromagnetic performances. In order to optimize the electromagnetic performance, the multi-objective genetic algorithm is adopted and 2D finite element method is used. Variables such as stator yoke height, tooth width, flux gap width, split ratio and rotor yoke thickness have been selected for the optimization. The objectives are to achieve maximized average torque, minimized torque ripple, copper loss and total machine mass. Amongst all the variables, the flux gap width is a key parameter which has significant impact on machine electromagnetic performance, but has not been included in the optimization process in the literature. The results in this paper have shown that considering the flux gap width in the optimization will lead to further improvement in machine electromagnetic performance. In addition, for machines with lower slot number than rotor pole number, the optimization process shows that an appropriate flux gap width is needed for optimal electromagnetic performance. However, for machines with higher slot number than pole number, the flux gap width tends to be zero, leading to non-modular machine having the optimal performance.","PeriodicalId":106489,"journal":{"name":"2021 IEEE International Electric Machines & Drives Conference (IEMDC)","volume":"33 7-8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116479077","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}
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