Pub Date : 2021-05-17DOI: 10.1109/IEMDC47953.2021.9449507
Ahmed Selema, M. Ibrahim, R. Sprangers, P. Sergeant
In high speed electrical machines, one of the main challenges that can be faced is the high frequency conduction losses in the machine windings due to both skin and proximity effects. This paper studies the effect of using different types of magnet wires on the AC losses of the electric machine windings. Using finite element modelling (FEM), the conductors are subdivided into multiple strands to calculate the losses in each conductor and in each layer. Further, aiming at loss minimization, different arrangements are introduced and compared at a wide range of frequencies. Moreover, recommendations are provided based on the obtained results and comparison.
{"title":"Effect of Using Different Types of Magnet Wires on the AC Losses of Electrical Machine Windings","authors":"Ahmed Selema, M. Ibrahim, R. Sprangers, P. Sergeant","doi":"10.1109/IEMDC47953.2021.9449507","DOIUrl":"https://doi.org/10.1109/IEMDC47953.2021.9449507","url":null,"abstract":"In high speed electrical machines, one of the main challenges that can be faced is the high frequency conduction losses in the machine windings due to both skin and proximity effects. This paper studies the effect of using different types of magnet wires on the AC losses of the electric machine windings. Using finite element modelling (FEM), the conductors are subdivided into multiple strands to calculate the losses in each conductor and in each layer. Further, aiming at loss minimization, different arrangements are introduced and compared at a wide range of frequencies. Moreover, recommendations are provided based on the obtained results and comparison.","PeriodicalId":106489,"journal":{"name":"2021 IEEE International Electric Machines & Drives Conference (IEMDC)","volume":"149 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":"127518437","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/IEMDC47953.2021.9449546
Cheng Gong, Fang Deng
For home appliance industry, since cost and space are the two main concerns, high-torque-density low-speed direct drive solutions are always what people look for. A new type of split-tooth concentrated winding Vernier motor that uses consequent-pole Halbach-array-based ferrite magnets and additional stator magnets between the stator split teeth is proposed in a preliminary study that shows a promising increase in the torque density. However, due to the use of low-coercivity ferrite magnets, the side magnets of the Halbach assembly are prone to suffer from demagnetization problems, which significantly reduces its performance. In this paper, the demagnetization of this new motor topology is analyzed in detail. First, the demagnetization under no load and full load conditions is analyzed. Then, in order to understand the mechanism of demagnetization, the assembly process of the rotor magnets is simulated. An equivalent model that takes into account the demagnetization is then proposed. In order to validate the proposed model, the static field and torque constant of the prototyped motor are measured and compared between the ideal model and proposed model. Finally, the effect of the aspect ratio of the rotor magnets on the demagnetization performance is discussed.
{"title":"Demagnetization Analysis of a Split-Tooth Concentrated-Winding Vernier Machine using Halbach-array-based Ferrite Magnets","authors":"Cheng Gong, Fang Deng","doi":"10.1109/IEMDC47953.2021.9449546","DOIUrl":"https://doi.org/10.1109/IEMDC47953.2021.9449546","url":null,"abstract":"For home appliance industry, since cost and space are the two main concerns, high-torque-density low-speed direct drive solutions are always what people look for. A new type of split-tooth concentrated winding Vernier motor that uses consequent-pole Halbach-array-based ferrite magnets and additional stator magnets between the stator split teeth is proposed in a preliminary study that shows a promising increase in the torque density. However, due to the use of low-coercivity ferrite magnets, the side magnets of the Halbach assembly are prone to suffer from demagnetization problems, which significantly reduces its performance. In this paper, the demagnetization of this new motor topology is analyzed in detail. First, the demagnetization under no load and full load conditions is analyzed. Then, in order to understand the mechanism of demagnetization, the assembly process of the rotor magnets is simulated. An equivalent model that takes into account the demagnetization is then proposed. In order to validate the proposed model, the static field and torque constant of the prototyped motor are measured and compared between the ideal model and proposed model. Finally, the effect of the aspect ratio of the rotor magnets on the demagnetization performance is discussed.","PeriodicalId":106489,"journal":{"name":"2021 IEEE International Electric Machines & Drives Conference (IEMDC)","volume":"35 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":"117080737","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/IEMDC47953.2021.9449504
Bryton Praslicka, Matthew Johnson, Daniel Zamarron, Avery Marshall, Shima Hasanpour, M. Gardner, Alex Nguyen, Abas Goodarzi, Enzo Bauk, H. Toliyat
Future space missions require new robotic technologies, such as precision gearboxes capable of achieving speed-reduction ratios in excess of 1000:1, specific torques exceeding 50 N*m/kg, operation in environmental temperatures as low as 40 K, and operation in low-atmosphere or hard vacuum, with high reliability and lifetime. The tribological challenges associated with lengthy missions in harsh space environments may be ameliorated with contactless magnetic gearing solutions. This paper employs an extensive parametric 2-D finite element analysis (FEA) study to optimize the high-torque stage of a two-stage surface permanent magnet radial flux cycloidal magnetic gear train, accounting for the impacts of practical fabrication constraints, which degrade the achievable performance and shift the optimal gear ratio. This paper presents a novel discussion of the internal stress distribution and the reaction forces acting on the structure of the cycloidal magnetic gear. This paper also proposes a rotor with three sections to simultaneously balance the center of mass, radial magnetic forces, and off-axis torques. A proof-of-concept prototype was developed, and the experimental slip torque and specific torque are presented. The specific torque of the prototype discussed in this paper is competitive with commercial mechanical cycloidal-type drives with a similar torque rating.
{"title":"Practical Analysis and Design of a 50:1 Cycloidal Magnetic Gear with Balanced Off-Axis Moments and a High Specific Torque for Lunar Robots","authors":"Bryton Praslicka, Matthew Johnson, Daniel Zamarron, Avery Marshall, Shima Hasanpour, M. Gardner, Alex Nguyen, Abas Goodarzi, Enzo Bauk, H. Toliyat","doi":"10.1109/IEMDC47953.2021.9449504","DOIUrl":"https://doi.org/10.1109/IEMDC47953.2021.9449504","url":null,"abstract":"Future space missions require new robotic technologies, such as precision gearboxes capable of achieving speed-reduction ratios in excess of 1000:1, specific torques exceeding 50 N*m/kg, operation in environmental temperatures as low as 40 K, and operation in low-atmosphere or hard vacuum, with high reliability and lifetime. The tribological challenges associated with lengthy missions in harsh space environments may be ameliorated with contactless magnetic gearing solutions. This paper employs an extensive parametric 2-D finite element analysis (FEA) study to optimize the high-torque stage of a two-stage surface permanent magnet radial flux cycloidal magnetic gear train, accounting for the impacts of practical fabrication constraints, which degrade the achievable performance and shift the optimal gear ratio. This paper presents a novel discussion of the internal stress distribution and the reaction forces acting on the structure of the cycloidal magnetic gear. This paper also proposes a rotor with three sections to simultaneously balance the center of mass, radial magnetic forces, and off-axis torques. A proof-of-concept prototype was developed, and the experimental slip torque and specific torque are presented. The specific torque of the prototype discussed in this paper is competitive with commercial mechanical cycloidal-type drives with a similar torque rating.","PeriodicalId":106489,"journal":{"name":"2021 IEEE International Electric Machines & Drives Conference (IEMDC)","volume":"67 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":"121869659","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/IEMDC47953.2021.9449501
S. Miric, R. Giuffrida, G. Rohner, D. Bortis, J. Kolar
Linear-rotary actuators (LiRAs) are today used in industry applications where a controlled linear and rotary motion is necessary such as pick-and-place robots, servo actuation of gearboxes or tooling machines. However, in special industry applications that require high purity and/or high precision positioning, the usage of conventional LiRAs with mechanical bearings is limited. Therefore, in this paper a LiRA with integrated magnetic bearings, i.e. a selfbearing/bearingless LiRA, is analyzed. The actuator employs concentrically arranged linear and rotary stators placed inside and outside a cylindrically shaped mover, which results in a so-called selfbearing double-stator (SBDS) LiRA. A FEM geometry optimization of the SBDS LiRA is performed and Pareto performance plots concerning linear force and torque generation are obtained. A SBDS LiRA hardware demonstrator and an 18-phase inverter power supply hardware prototype are built and their operation is experimentally verified by rotary and linear position step response measurements.
{"title":"Design and Experimental Analysis of a Selfbearing Double-Stator Linear-Rotary Actuator","authors":"S. Miric, R. Giuffrida, G. Rohner, D. Bortis, J. Kolar","doi":"10.1109/IEMDC47953.2021.9449501","DOIUrl":"https://doi.org/10.1109/IEMDC47953.2021.9449501","url":null,"abstract":"Linear-rotary actuators (LiRAs) are today used in industry applications where a controlled linear and rotary motion is necessary such as pick-and-place robots, servo actuation of gearboxes or tooling machines. However, in special industry applications that require high purity and/or high precision positioning, the usage of conventional LiRAs with mechanical bearings is limited. Therefore, in this paper a LiRA with integrated magnetic bearings, i.e. a selfbearing/bearingless LiRA, is analyzed. The actuator employs concentrically arranged linear and rotary stators placed inside and outside a cylindrically shaped mover, which results in a so-called selfbearing double-stator (SBDS) LiRA. A FEM geometry optimization of the SBDS LiRA is performed and Pareto performance plots concerning linear force and torque generation are obtained. A SBDS LiRA hardware demonstrator and an 18-phase inverter power supply hardware prototype are built and their operation is experimentally verified by rotary and linear position step response measurements.","PeriodicalId":106489,"journal":{"name":"2021 IEEE International Electric Machines & Drives Conference (IEMDC)","volume":"31 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":"114168692","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/IEMDC47953.2021.9449527
A. Credo, L. Di Leonardo, M. D'Andrea, D. Macera
This paper presents different electric motor solutions integrated in primary flight surface actuators for aircraft applications in the field of the so called ‘More Electric Aircraft’ research and development. In particular, the motors have been designed and analyzed with a finite-element study, considering the most severe working-points in terms of thermal conditions and aerodynamic load torque demand, aiming to predict both the performance and the degradation. In addition, magnet-free motor solutions with fault-tolerant capabilities towards possible magnet demagnetization are investigated and compared in the same critical conditions. The comparison between the different motor typologies is carried out considering the thermal issues, the behavior of the motor with respect to the faults, the electromagnetic performances, and the necessity to have a market competitive product.
{"title":"Analysis of electric motor alternatives for Primary Flight Surface Actuators","authors":"A. Credo, L. Di Leonardo, M. D'Andrea, D. Macera","doi":"10.1109/IEMDC47953.2021.9449527","DOIUrl":"https://doi.org/10.1109/IEMDC47953.2021.9449527","url":null,"abstract":"This paper presents different electric motor solutions integrated in primary flight surface actuators for aircraft applications in the field of the so called ‘More Electric Aircraft’ research and development. In particular, the motors have been designed and analyzed with a finite-element study, considering the most severe working-points in terms of thermal conditions and aerodynamic load torque demand, aiming to predict both the performance and the degradation. In addition, magnet-free motor solutions with fault-tolerant capabilities towards possible magnet demagnetization are investigated and compared in the same critical conditions. The comparison between the different motor typologies is carried out considering the thermal issues, the behavior of the motor with respect to the faults, the electromagnetic performances, and the necessity to have a market competitive product.","PeriodicalId":106489,"journal":{"name":"2021 IEEE International Electric Machines & Drives Conference (IEMDC)","volume":"21 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":"114370395","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/IEMDC47953.2021.9449589
Abdalla Hussein Mohamed, H. Vansompel, P. Sergeant
In this paper, an integrated motor drive with modular converter structure is analysed with different number of converter modules per phase. The integration concept is realized by designing a housing structure with a flat outer surface and a circular inner surface with a cooling channel in between. The converter modules are mounted on the outer flat surface and the stator components are attached to the inner surface. This integration topology is applied on a fifteen stator coil concentrated winding permanent magnet axial flux machine. The converter modules are implemented as half-bridge inverter using Gallium Nitride (GaN) technology. The cooling structure is optimized using computational fluid dynamics (CFD) simulations. The maximum thermally safe current that can be injected by one inverter module is computed. The maximum winding current is also calculated. Parallel connection of the inverter modules is suggested to maximize the thermal utilization of the windings while keeping the inverter switches junction temperature under the rated value. The CFD based computations are validated with experimental measurements.
{"title":"An Integrated Motor Drive with Enhanced Power Density Using Modular Converter Structure","authors":"Abdalla Hussein Mohamed, H. Vansompel, P. Sergeant","doi":"10.1109/IEMDC47953.2021.9449589","DOIUrl":"https://doi.org/10.1109/IEMDC47953.2021.9449589","url":null,"abstract":"In this paper, an integrated motor drive with modular converter structure is analysed with different number of converter modules per phase. The integration concept is realized by designing a housing structure with a flat outer surface and a circular inner surface with a cooling channel in between. The converter modules are mounted on the outer flat surface and the stator components are attached to the inner surface. This integration topology is applied on a fifteen stator coil concentrated winding permanent magnet axial flux machine. The converter modules are implemented as half-bridge inverter using Gallium Nitride (GaN) technology. The cooling structure is optimized using computational fluid dynamics (CFD) simulations. The maximum thermally safe current that can be injected by one inverter module is computed. The maximum winding current is also calculated. Parallel connection of the inverter modules is suggested to maximize the thermal utilization of the windings while keeping the inverter switches junction temperature under the rated value. The CFD based computations are validated with experimental measurements.","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":"130723182","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/IEMDC47953.2021.9449541
Md. Khurshedul Islam, Seundeog Choi
Bi-directional wireless communication between the earth's surface and underground or undersea facilities is infeasible because of the conventional electrical antenna's (CEA) excessive power requirement and enormous size. The most promising and power-efficient solution to this problem is using a mechanical-based antenna (AMEBA) that enables the ULF-VLF (0.03-10 kHz) communication in these conductive media. However, one of the main challenges in developing the AMEBA is designing its transmitter, i.e., the ultra-high-speed (UHS) rotor, which rotates the polarized permanent magnet (PPM) in a wide range of frequency. Because of the high rotating frequency and high load inertia of PPM, the UHS rotor's design becomes more critical in terms of Rotordynamic and vibration issues. This paper presents a detailed Rotordynamic analysis of a 2 kW, 500000 r/min UHS AMEBA rotor, which can generate transmitting frequency up to 8333 Hz. First, the UHS rotor's design is presented, which meets the torque and speed requirement of the AMEBA system. The impact of the different rotor materials on the rotor's undamped natural frequency is studied. Then, considering the AMEBA application, other rotor dynamic characteristics such as critical speed, bearing selection, Campbell diagram, and unbalance harmonic responses are investigated using 3-D finite element analysis (FEA). Finally, the UHS AMEBA rotor prototype is built, and an experiment of impulse hammer testing is performed to validate the rotor's undamped natural frequencies.
{"title":"Rotordynamic Analysis of 500 000 r/min 2 kW Ultra-High-Speed Machine for Portable Mechanical Antenna","authors":"Md. Khurshedul Islam, Seundeog Choi","doi":"10.1109/IEMDC47953.2021.9449541","DOIUrl":"https://doi.org/10.1109/IEMDC47953.2021.9449541","url":null,"abstract":"Bi-directional wireless communication between the earth's surface and underground or undersea facilities is infeasible because of the conventional electrical antenna's (CEA) excessive power requirement and enormous size. The most promising and power-efficient solution to this problem is using a mechanical-based antenna (AMEBA) that enables the ULF-VLF (0.03-10 kHz) communication in these conductive media. However, one of the main challenges in developing the AMEBA is designing its transmitter, i.e., the ultra-high-speed (UHS) rotor, which rotates the polarized permanent magnet (PPM) in a wide range of frequency. Because of the high rotating frequency and high load inertia of PPM, the UHS rotor's design becomes more critical in terms of Rotordynamic and vibration issues. This paper presents a detailed Rotordynamic analysis of a 2 kW, 500000 r/min UHS AMEBA rotor, which can generate transmitting frequency up to 8333 Hz. First, the UHS rotor's design is presented, which meets the torque and speed requirement of the AMEBA system. The impact of the different rotor materials on the rotor's undamped natural frequency is studied. Then, considering the AMEBA application, other rotor dynamic characteristics such as critical speed, bearing selection, Campbell diagram, and unbalance harmonic responses are investigated using 3-D finite element analysis (FEA). Finally, the UHS AMEBA rotor prototype is built, and an experiment of impulse hammer testing is performed to validate the rotor's undamped natural frequencies.","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":"117190912","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/IEMDC47953.2021.9449490
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/IEMDC47953.2021.9449556
Murat G. Kesgin, Peng Han, D. Lawhorn, D. Ionel
The paper presents a study of the torque production in a novel vernier-type axial-flux permanent magnet (PM) machine topology named MAGNUS. Two computational methods are employed, one based on the 3D FEA Maxwell stress calculations on individual stator and rotor components and one based on the analytical derivation of the air-gap flux density harmonics. Examples are provided for a design with a 40-pole spoke-type PM rotor and two stators, one active including a 3-phase winding with 6 concentrated coils wound around main teeth in a single layer arrangement and a second stator that has neither coils nor main slots and is profiled towards the airgap in the same way as the active stator. It is shown that auxiliary small teeth included in the stator main teeth yield a significant increase in the output torque and that the profiled stator has a lower contribution than the active stator to the total torque. A brief report on the ongoing development of a prototype motor is included.
{"title":"Analysis of Torque Production in Axial-flux Vernier PM Machines of the MAGNUS Type","authors":"Murat G. Kesgin, Peng Han, D. Lawhorn, D. Ionel","doi":"10.1109/IEMDC47953.2021.9449556","DOIUrl":"https://doi.org/10.1109/IEMDC47953.2021.9449556","url":null,"abstract":"The paper presents a study of the torque production in a novel vernier-type axial-flux permanent magnet (PM) machine topology named MAGNUS. Two computational methods are employed, one based on the 3D FEA Maxwell stress calculations on individual stator and rotor components and one based on the analytical derivation of the air-gap flux density harmonics. Examples are provided for a design with a 40-pole spoke-type PM rotor and two stators, one active including a 3-phase winding with 6 concentrated coils wound around main teeth in a single layer arrangement and a second stator that has neither coils nor main slots and is profiled towards the airgap in the same way as the active stator. It is shown that auxiliary small teeth included in the stator main teeth yield a significant increase in the output torque and that the profiled stator has a lower contribution than the active stator to the total torque. A brief report on the ongoing development of a prototype motor is included.","PeriodicalId":106489,"journal":{"name":"2021 IEEE International Electric Machines & Drives Conference (IEMDC)","volume":"23 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":"129014448","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}
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