Pub Date : 2021-05-17DOI: 10.1109/IEMDC47953.2021.9449490
Yibin Zhang, D. Lawhorn, Peng Han, D. Ionel
The single-phase to two-phase converters have become attractive for low-power motor drives due to the full electromagnetic isolation between phases of two-phase motors. One of the commonly used topologies is the ac/dc/ac pulse width modulation (PWM) converter which contains twelve active power semiconductor switches and a common dc link. To minimize the system cost and size for low power applications, an integrated ac/ac converter with a single-phase input and a two-phase output which reduces the switch count to six is proposed in this paper. Additionally, modulation scheme and filters for the proposed converter are developed and modeled in details. In this paper a systematic comparison among the conventional ac/dc/ac converters, matrix converters, and the proposed integrated ac to ac converters for single-phase input to two-phase output motor drives applications is performed in terms of the output voltage/current capability, total harmonics distortion (THD), and system cost. Furthermore, closed-loop speed controllers are developed for the three topologies, and the maximum operation range and output phase currents are investigated. Simulation and experimental results validated the effectiveness of the developed converters and control strategies.
{"title":"Integrated AC to AC Converters for Single-phase Input to Two-phase Output Motor Drives","authors":"Yibin Zhang, D. Lawhorn, Peng Han, D. Ionel","doi":"10.1109/IEMDC47953.2021.9449490","DOIUrl":"https://doi.org/10.1109/IEMDC47953.2021.9449490","url":null,"abstract":"The single-phase to two-phase converters have become attractive for low-power motor drives due to the full electromagnetic isolation between phases of two-phase motors. One of the commonly used topologies is the ac/dc/ac pulse width modulation (PWM) converter which contains twelve active power semiconductor switches and a common dc link. To minimize the system cost and size for low power applications, an integrated ac/ac converter with a single-phase input and a two-phase output which reduces the switch count to six is proposed in this paper. Additionally, modulation scheme and filters for the proposed converter are developed and modeled in details. In this paper a systematic comparison among the conventional ac/dc/ac converters, matrix converters, and the proposed integrated ac to ac converters for single-phase input to two-phase output motor drives applications is performed in terms of the output voltage/current capability, total harmonics distortion (THD), and system cost. Furthermore, closed-loop speed controllers are developed for the three topologies, and the maximum operation range and output phase currents are investigated. Simulation and experimental results validated the effectiveness of the developed converters and control strategies.","PeriodicalId":106489,"journal":{"name":"2021 IEEE International Electric Machines & Drives Conference (IEMDC)","volume":"1 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":"128946010","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/IEMDC47953.2021.9449521
Issah Ibrahim, T. Rahman, D. Lowther
This paper investigates the effects of temperature changes and the switching strategy of the inverter on the acoustic noise performance of the interior permanent magnet synchronous motor drive system. The proposed approach uses the finite element method to extract a library of knowledge related to the acoustic field of the electric motor under different operating conditions. The paper is sectionalized as follows: Section one introduces the importance of incorporating thermal models in acoustic noise studies by drawing motivation from the paucity of thermo-acoustic materials in the literature; Section two briefly describes how the CAD model is built and how the geometric database is generated from the parameterized model. It also points the reader to the design and simulation assumptions that have been formulated to support the proposed methodology; Section three discusses how the excitation currents are generated and applied to the finite element models to evaluate the multiphysics objectives for the study; finally, Section four presents the simulated results for all the investigated motor designs and provides a detailed discussion of the emerging trends associated with varying the operating temperature and the switching frequency of the inverter circuit.
{"title":"A Study of Vibroacoustic Performance of Synchronous Motor Drives under Different Operating Conditions","authors":"Issah Ibrahim, T. Rahman, D. Lowther","doi":"10.1109/IEMDC47953.2021.9449521","DOIUrl":"https://doi.org/10.1109/IEMDC47953.2021.9449521","url":null,"abstract":"This paper investigates the effects of temperature changes and the switching strategy of the inverter on the acoustic noise performance of the interior permanent magnet synchronous motor drive system. The proposed approach uses the finite element method to extract a library of knowledge related to the acoustic field of the electric motor under different operating conditions. The paper is sectionalized as follows: Section one introduces the importance of incorporating thermal models in acoustic noise studies by drawing motivation from the paucity of thermo-acoustic materials in the literature; Section two briefly describes how the CAD model is built and how the geometric database is generated from the parameterized model. It also points the reader to the design and simulation assumptions that have been formulated to support the proposed methodology; Section three discusses how the excitation currents are generated and applied to the finite element models to evaluate the multiphysics objectives for the study; finally, Section four presents the simulated results for all the investigated motor designs and provides a detailed discussion of the emerging trends associated with varying the operating temperature and the switching frequency of the inverter circuit.","PeriodicalId":106489,"journal":{"name":"2021 IEEE International Electric Machines & Drives Conference (IEMDC)","volume":"1 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":"129227240","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/IEMDC47953.2021.9449503
H. Won, Yang-Ki Hong, Minyeong Choi, Briana Bryant, Jonathan Platt, Seungdeog Choi
This paper investigates a three-layer hybrid permanent magnet assisted synchronous reluctance machine (H-PMASynRM) that exhibits the most cost-effective performance for electric vehicle applications. Two kinds of permanent magnet, ferrite and NdFeB, are interchangeably used to evaluate motor performance metrics such as the torque per cost, torque density, efficiency, peak power factor, maximum speed, and rate of irreversible demagnetization. The simulation results show that the H-PMASynRM having the first layer made of NdFeB, the second layer made of ferrite, and the third layer made of a combination of ferrite and NdFeB, can exhibit the same maximum torque of 220 Nm with $12 lower cost, 1-3% higher efficiency at speed above 8,000 rpm, 6.8% lower peak power factor, and only 17% lower torque density compared to the NdFeB-based V-type PMSM that is used in Toyota Prius 2010.
{"title":"Cost-Effectiveness Hybrid Permanent Magnet Assisted Synchronous Reluctance Machine for Electric Vehicle","authors":"H. Won, Yang-Ki Hong, Minyeong Choi, Briana Bryant, Jonathan Platt, Seungdeog Choi","doi":"10.1109/IEMDC47953.2021.9449503","DOIUrl":"https://doi.org/10.1109/IEMDC47953.2021.9449503","url":null,"abstract":"This paper investigates a three-layer hybrid permanent magnet assisted synchronous reluctance machine (H-PMASynRM) that exhibits the most cost-effective performance for electric vehicle applications. Two kinds of permanent magnet, ferrite and NdFeB, are interchangeably used to evaluate motor performance metrics such as the torque per cost, torque density, efficiency, peak power factor, maximum speed, and rate of irreversible demagnetization. The simulation results show that the H-PMASynRM having the first layer made of NdFeB, the second layer made of ferrite, and the third layer made of a combination of ferrite and NdFeB, can exhibit the same maximum torque of 220 Nm with $12 lower cost, 1-3% higher efficiency at speed above 8,000 rpm, 6.8% lower peak power factor, and only 17% lower torque density compared to the NdFeB-based V-type PMSM that is used in Toyota Prius 2010.","PeriodicalId":106489,"journal":{"name":"2021 IEEE International Electric Machines & Drives Conference (IEMDC)","volume":"19 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":"134132471","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/IEMDC47953.2021.9449515
Samith Sirimanna, P. Huynh, Anjana J. Samarakoon, Dongsu Lee, A. Banerjee, K. Haran
Many modern direct-drive wind generators at high power levels adopt permanent magnet synchronous generators (PMSGs). Typically, these PMSGs are coupled with fully rated active rectifiers to process and deliver power to the main grid. However, the limited-speed nature of a wind turbine creates an opportunity to reduce the amount of active rectification required, which in turn would reduce the cost of the drive and improve system reliability. This paper presents a design and optimization process of a direct-drive PMSG coupled to an integrated generator-rectifier system. In order to make the hybrid architecture possible, a multi-port generator is designed with multiple diode rectifiers and a single active rectifier. This paper describes a process for a 10 MW generator-drive optimization under the proposed architecture with two different implementation methods. These implementations are compared using optimal Pareto front from a system-level efficiency-weight perspective.
{"title":"Design and Optimization of an Integrated Generator-Rectifier System for Offshore Wind Turbines","authors":"Samith Sirimanna, P. Huynh, Anjana J. Samarakoon, Dongsu Lee, A. Banerjee, K. Haran","doi":"10.1109/IEMDC47953.2021.9449515","DOIUrl":"https://doi.org/10.1109/IEMDC47953.2021.9449515","url":null,"abstract":"Many modern direct-drive wind generators at high power levels adopt permanent magnet synchronous generators (PMSGs). Typically, these PMSGs are coupled with fully rated active rectifiers to process and deliver power to the main grid. However, the limited-speed nature of a wind turbine creates an opportunity to reduce the amount of active rectification required, which in turn would reduce the cost of the drive and improve system reliability. This paper presents a design and optimization process of a direct-drive PMSG coupled to an integrated generator-rectifier system. In order to make the hybrid architecture possible, a multi-port generator is designed with multiple diode rectifiers and a single active rectifier. This paper describes a process for a 10 MW generator-drive optimization under the proposed architecture with two different implementation methods. These implementations are compared using optimal Pareto front from a system-level efficiency-weight perspective.","PeriodicalId":106489,"journal":{"name":"2021 IEEE International Electric Machines & Drives Conference (IEMDC)","volume":"54 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":"132517941","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/IEMDC47953.2021.9449587
Yang Liang, D. Liang, S. Jia, Shuaijun Chu, Hao Wang, Yongtao Liang
The driving electric machine of high-power flywheel energy storage system (FESS) has the characteristics of high fundamental frequency and low inductance, which lead to high current harmonic content and increases the loss of FESS. To suppress the current harmonics, a compound control scheme is proposed for an innovative hybrid converter in this paper. The mathematical model of the hybrid converter is analyzed and divided into two parts: main voltage source converter (MVSC) and filtering voltage source converter (FVSC). According to the characteristics of MVSC and FVSC in output power and switching frequency, two different regular sampling strategies are described and applied. On this basis, the exact MVSC model in discrete time-domain is established, and the current controller with complex vector decoupling is designed. Similarly, a current controller with feedback decoupling is designed for FVSC in the continuous time-domain. Both the current controllers have excellent robustness and dynamic response ability. Finally, the proposed control strategy in this paper is verified by simulation results.
{"title":"Current Control System of Hybrid Converter for Suppressing Current Harmonics","authors":"Yang Liang, D. Liang, S. Jia, Shuaijun Chu, Hao Wang, Yongtao Liang","doi":"10.1109/IEMDC47953.2021.9449587","DOIUrl":"https://doi.org/10.1109/IEMDC47953.2021.9449587","url":null,"abstract":"The driving electric machine of high-power flywheel energy storage system (FESS) has the characteristics of high fundamental frequency and low inductance, which lead to high current harmonic content and increases the loss of FESS. To suppress the current harmonics, a compound control scheme is proposed for an innovative hybrid converter in this paper. The mathematical model of the hybrid converter is analyzed and divided into two parts: main voltage source converter (MVSC) and filtering voltage source converter (FVSC). According to the characteristics of MVSC and FVSC in output power and switching frequency, two different regular sampling strategies are described and applied. On this basis, the exact MVSC model in discrete time-domain is established, and the current controller with complex vector decoupling is designed. Similarly, a current controller with feedback decoupling is designed for FVSC in the continuous time-domain. Both the current controllers have excellent robustness and dynamic response ability. Finally, the proposed control strategy in this paper is verified by simulation results.","PeriodicalId":106489,"journal":{"name":"2021 IEEE International Electric Machines & Drives Conference (IEMDC)","volume":"33 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":"129360477","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/IEMDC47953.2021.9449593
Dilshad Surroop, P. Combes, Philippe Martin
We show how the rotor position of a PWM-fed PMSM can be recovered, even at low velocity or standstill, from the measured currents. The method is based on the excitation created by the PWM, without the need for an external probing signal. One originality of the approach is that we directly process the bitstream output by a Sigma-Delta modulator, hence do not require special derivative current sensors nor fast multibit ADCs, thereby opening the way for an effective implementation in an industrial drive.
{"title":"Towards an industrially implementable PWM-injection scheme","authors":"Dilshad Surroop, P. Combes, Philippe Martin","doi":"10.1109/IEMDC47953.2021.9449593","DOIUrl":"https://doi.org/10.1109/IEMDC47953.2021.9449593","url":null,"abstract":"We show how the rotor position of a PWM-fed PMSM can be recovered, even at low velocity or standstill, from the measured currents. The method is based on the excitation created by the PWM, without the need for an external probing signal. One originality of the approach is that we directly process the bitstream output by a Sigma-Delta modulator, hence do not require special derivative current sensors nor fast multibit ADCs, thereby opening the way for an effective implementation in an industrial drive.","PeriodicalId":106489,"journal":{"name":"2021 IEEE International Electric Machines & Drives Conference (IEMDC)","volume":"81 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":"128411468","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/IEMDC47953.2021.9449608
Peng Han, G. Heins, Yibin Zhang, D. Ionel
The integrated motor drive (IMD) concept with possible modularization has attracted much attention in a broad spectrum of applications ranging from low-power general-purpose industrial drives to high-power electric propulsion. This paper presents the feasibility study and performance evaluation of using common axial-flux permanent-magnet (AFPM) machines with fractional-slot concentrated windings in IMDs, with the same diameter and a minimum increase in its axial length. Different winding configurations are compared in terms of the torque/power capability and fault tolerance without changing the winding current rating. The possibility of further torque improvement is discussed from the perspective of making full use of the air-gap field harmonics produced by PMs. An AFPM machine available in the lab has been dissembled and used to build the proof-of-concept design, to show the feasibility of the proposed design and benefits of the IMD.
{"title":"Integrated Modular Motor Drives Based on Multiphase Axial-flux PM Machines with Fractional-slot Concentrated Windings","authors":"Peng Han, G. Heins, Yibin Zhang, D. Ionel","doi":"10.1109/IEMDC47953.2021.9449608","DOIUrl":"https://doi.org/10.1109/IEMDC47953.2021.9449608","url":null,"abstract":"The integrated motor drive (IMD) concept with possible modularization has attracted much attention in a broad spectrum of applications ranging from low-power general-purpose industrial drives to high-power electric propulsion. This paper presents the feasibility study and performance evaluation of using common axial-flux permanent-magnet (AFPM) machines with fractional-slot concentrated windings in IMDs, with the same diameter and a minimum increase in its axial length. Different winding configurations are compared in terms of the torque/power capability and fault tolerance without changing the winding current rating. The possibility of further torque improvement is discussed from the perspective of making full use of the air-gap field harmonics produced by PMs. An AFPM machine available in the lab has been dissembled and used to build the proof-of-concept design, to show the feasibility of the proposed design and benefits of the IMD.","PeriodicalId":106489,"journal":{"name":"2021 IEEE International Electric Machines & Drives Conference (IEMDC)","volume":"30 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":"124346529","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/IEMDC47953.2021.9449610
Y. Demir, A. El-Refaie, M. Aydin
Fractional-slot concentrated winding permanent magnet (PM) machines have been gaining interest over the last decade in various applications. In this paper, a comparison of various conventional fractional-slot PM machines with an unconventional and unbalanced fractional-slot distributed winding PM motor is presented. The motors are designed for the same torque-speed curve, same design envelope, same electrical loading and magnet weight. No skewing is utilized in the designs for a fair comparison. It is found that 12-slot/10-pole and 27-slot/12-pole combinations stand out in terms of meeting the same torque-speed profile of the baseline machine with 39-slot/12-pole while having comparable performance metrics especially when it comes to reducing torque ripple.
{"title":"Comparison of Permanent Magnet Machines Equipped with Unbalanced Fractional-Slot Distributed Windings vs. Balanced Fractional-Slot Concentrated Windings","authors":"Y. Demir, A. El-Refaie, M. Aydin","doi":"10.1109/IEMDC47953.2021.9449610","DOIUrl":"https://doi.org/10.1109/IEMDC47953.2021.9449610","url":null,"abstract":"Fractional-slot concentrated winding permanent magnet (PM) machines have been gaining interest over the last decade in various applications. In this paper, a comparison of various conventional fractional-slot PM machines with an unconventional and unbalanced fractional-slot distributed winding PM motor is presented. The motors are designed for the same torque-speed curve, same design envelope, same electrical loading and magnet weight. No skewing is utilized in the designs for a fair comparison. It is found that 12-slot/10-pole and 27-slot/12-pole combinations stand out in terms of meeting the same torque-speed profile of the baseline machine with 39-slot/12-pole while having comparable performance metrics especially when it comes to reducing torque ripple.","PeriodicalId":106489,"journal":{"name":"2021 IEEE International Electric Machines & Drives Conference (IEMDC)","volume":"4 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":"117003523","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/IEMDC47953.2021.9449570
Qichen Jin, J. K. Mendizábal, N. Miljkovic, A. Banerjee
A fault detection and prediction method of insulated-gate bipolar transistor (IGBT) has been improved over the past decades to reduce system down time. In situ lifetime estimation of IGBT modules has been challenging due to a number of requirements: necessity to operate at high-voltage in the switching environment, measurement precision of the gate-threshold voltage or collector-to-emitter voltage. This paper presents a wear-fatigue estimation framework that consists of collector-to-emitter measurement, power loss calculation and thermal lifetime prediction model. The measurement circuit enables the estimation of power loss across a variety of IGBT modules with minimum impact on system reliability.
{"title":"In Situ Power Loss Estimation of IGBT Power Modules","authors":"Qichen Jin, J. K. Mendizábal, N. Miljkovic, A. Banerjee","doi":"10.1109/IEMDC47953.2021.9449570","DOIUrl":"https://doi.org/10.1109/IEMDC47953.2021.9449570","url":null,"abstract":"A fault detection and prediction method of insulated-gate bipolar transistor (IGBT) has been improved over the past decades to reduce system down time. In situ lifetime estimation of IGBT modules has been challenging due to a number of requirements: necessity to operate at high-voltage in the switching environment, measurement precision of the gate-threshold voltage or collector-to-emitter voltage. This paper presents a wear-fatigue estimation framework that consists of collector-to-emitter measurement, power loss calculation and thermal lifetime prediction model. The measurement circuit enables the estimation of power loss across a variety of IGBT modules with minimum impact on system reliability.","PeriodicalId":106489,"journal":{"name":"2021 IEEE International Electric Machines & Drives Conference (IEMDC)","volume":"42 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":"115618498","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/IEMDC47953.2021.9449542
A. Al-Qarni, A. El-Refaie
A high performance Interior Permanent Magnet (IPM) machine utilizing heavy rare-earth elements is considered the workhorse for many applications especially traction applications. Dysprosium (Dy) is one of the heavy rare-earth elements used in higher Permanent Magnet (PM) grades and its inclusion is critical to eliminate/minimize the risk of permanent demagnetization. On the other hand, Dy is one of the key elements that are subject to price volatility as well as sustainability concerns. Therefore, this paper aims to propose an IPM machine design for traction applications based on Nissan Leaf 2012 electric motor using a blend of magnet types that eliminate the use of Dy (can be thought of as hybrid magnets) to reduce the overall PM cost while maintaining comparable electromagnetic performance. Most importantly, this paper's objective is to provide a topology for the transportation sector using PM materials that addresses sustainability concerns. This paper will present the electromagnetic performance evaluation of the proposed design using Two-Dimensional Finite Element Analysis (2D-FEA). Comparison of key performance metrics including torque vs. current angle, efficiency map, risk of demagnetization, and comprehensive comparison to the baseline design will also be presented. In addition, rotor mechanical analysis as well as cost analysis are included.
{"title":"On Eliminating Heavy Rare-Earth PM Elements for High Power Density Traction Application Motors","authors":"A. Al-Qarni, A. El-Refaie","doi":"10.1109/IEMDC47953.2021.9449542","DOIUrl":"https://doi.org/10.1109/IEMDC47953.2021.9449542","url":null,"abstract":"A high performance Interior Permanent Magnet (IPM) machine utilizing heavy rare-earth elements is considered the workhorse for many applications especially traction applications. Dysprosium (Dy) is one of the heavy rare-earth elements used in higher Permanent Magnet (PM) grades and its inclusion is critical to eliminate/minimize the risk of permanent demagnetization. On the other hand, Dy is one of the key elements that are subject to price volatility as well as sustainability concerns. Therefore, this paper aims to propose an IPM machine design for traction applications based on Nissan Leaf 2012 electric motor using a blend of magnet types that eliminate the use of Dy (can be thought of as hybrid magnets) to reduce the overall PM cost while maintaining comparable electromagnetic performance. Most importantly, this paper's objective is to provide a topology for the transportation sector using PM materials that addresses sustainability concerns. This paper will present the electromagnetic performance evaluation of the proposed design using Two-Dimensional Finite Element Analysis (2D-FEA). Comparison of key performance metrics including torque vs. current angle, efficiency map, risk of demagnetization, and comprehensive comparison to the baseline design will also be presented. In addition, rotor mechanical analysis as well as cost analysis are included.","PeriodicalId":106489,"journal":{"name":"2021 IEEE International Electric Machines & Drives Conference (IEMDC)","volume":"5 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":"127815234","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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