Pub Date : 2015-05-10DOI: 10.1109/IEMDC.2015.7409229
Arunvel Kailasan, Radu Curiae
Magnetic bearings are now consistently used in high speed motors owing to their many advantages over traditional bearings. However, the bandwidth of magnetic bearings may be severely limited due to the occurrence of eddy currents which cause power loss and instability in nominal operation. This problem is generally overcome in radial magnetic bearings by laminating the core. This solution is difficult to implement in a thrust magnetic bearing mainly due to high cost associated with complexity of machining and assembly. As a result, the solid thrust stator is fragmented into several pieces, which are mounted onto a common plate. In several applications, it is not possible to add this common plate due to size limitations. To improve the controller response, it is thought that a single slit can be introduced. To quantify this improvement, a Finite element model study was conducted. By extension, the minimum number of slits that need to be introduced to keep eddy currents at a minimum was also studied. This paper studies and compares the eddy current effects in different thrust bearing configurations which include a single slit, double slit, four slit and eight slit thrust magnetic bearing. Finite element analysis techniques are used to model and simulate these different configurations. Based on these results several configurations are being built to validate and test the models.
{"title":"Quantifying eddy current effects on a magnetic thrust bearing used in a high speed electrical machine","authors":"Arunvel Kailasan, Radu Curiae","doi":"10.1109/IEMDC.2015.7409229","DOIUrl":"https://doi.org/10.1109/IEMDC.2015.7409229","url":null,"abstract":"Magnetic bearings are now consistently used in high speed motors owing to their many advantages over traditional bearings. However, the bandwidth of magnetic bearings may be severely limited due to the occurrence of eddy currents which cause power loss and instability in nominal operation. This problem is generally overcome in radial magnetic bearings by laminating the core. This solution is difficult to implement in a thrust magnetic bearing mainly due to high cost associated with complexity of machining and assembly. As a result, the solid thrust stator is fragmented into several pieces, which are mounted onto a common plate. In several applications, it is not possible to add this common plate due to size limitations. To improve the controller response, it is thought that a single slit can be introduced. To quantify this improvement, a Finite element model study was conducted. By extension, the minimum number of slits that need to be introduced to keep eddy currents at a minimum was also studied. This paper studies and compares the eddy current effects in different thrust bearing configurations which include a single slit, double slit, four slit and eight slit thrust magnetic bearing. Finite element analysis techniques are used to model and simulate these different configurations. Based on these results several configurations are being built to validate and test the models.","PeriodicalId":6477,"journal":{"name":"2015 IEEE International Electric Machines & Drives Conference (IEMDC)","volume":"7 1","pages":"1299-1304"},"PeriodicalIF":0.0,"publicationDate":"2015-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87381175","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 : 2015-05-10DOI: 10.1109/IEMDC.2015.7409281
M. Merdzan, J. Paulides, A. Borisavljevic, E. Lomonova
Harmonic content of the output voltage of pulse width modulated voltage source inverters (PWM VSI) is determined by the switching frequency. On the other hand, rotor losses in high-speed permanent magnet (PM) machines are caused, among other factors, by harmonics in stator currents. These harmonics are determined by the harmonics in the inverter output voltage, and therefore dependent on the switching frequency. In high-speed PM machines, due to the high fundamental frequency, harmonics in the stator currents caused by PWM are located at very high frequencies. Measurement of rotor losses caused by these harmonics in a structure with a conductive retaining sleeve on the rotor which is prone to eddy currents might be very challenging. This paper investigates issues related to this measurement and presents a measurement method which results are compared with results from a 2D analytical model that takes into account eddy currents in the rotor.
{"title":"The influence of the inverter switching frequency on rotor losses in high-speed permanent magnet machines: An experimental study","authors":"M. Merdzan, J. Paulides, A. Borisavljevic, E. Lomonova","doi":"10.1109/IEMDC.2015.7409281","DOIUrl":"https://doi.org/10.1109/IEMDC.2015.7409281","url":null,"abstract":"Harmonic content of the output voltage of pulse width modulated voltage source inverters (PWM VSI) is determined by the switching frequency. On the other hand, rotor losses in high-speed permanent magnet (PM) machines are caused, among other factors, by harmonics in stator currents. These harmonics are determined by the harmonics in the inverter output voltage, and therefore dependent on the switching frequency. In high-speed PM machines, due to the high fundamental frequency, harmonics in the stator currents caused by PWM are located at very high frequencies. Measurement of rotor losses caused by these harmonics in a structure with a conductive retaining sleeve on the rotor which is prone to eddy currents might be very challenging. This paper investigates issues related to this measurement and presents a measurement method which results are compared with results from a 2D analytical model that takes into account eddy currents in the rotor.","PeriodicalId":6477,"journal":{"name":"2015 IEEE International Electric Machines & Drives Conference (IEMDC)","volume":"60 1","pages":"1628-1633"},"PeriodicalIF":0.0,"publicationDate":"2015-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77200307","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 : 2015-05-10DOI: 10.1109/IEMDC.2015.7409259
Yoshiki Ohno, K. Kondo
There are still several technical problems with batteries for electric vehicles (EVs), such as short life of batteries on board, and less driving distance. An unbalanced input voltage three level inverter have been studied for a traction system for battery and EDLCs (Electric Double Layer Capacitors) hybrid EVs. This system is expected to reduce the loss and mass compared to a system with DC/DC chopper. When applying EDLCs as energy storage device, the energy management is essential through the whole operation of the motor because the energy density of EDLC is not so high and it can be charged only by the regenerative brake. In this paper, a method to manage energy of EDLC is proposed and it is examined by 1kW class experimental system.
{"title":"A study on a energy management of EDLC for unbalanced input voltage three level inverter","authors":"Yoshiki Ohno, K. Kondo","doi":"10.1109/IEMDC.2015.7409259","DOIUrl":"https://doi.org/10.1109/IEMDC.2015.7409259","url":null,"abstract":"There are still several technical problems with batteries for electric vehicles (EVs), such as short life of batteries on board, and less driving distance. An unbalanced input voltage three level inverter have been studied for a traction system for battery and EDLCs (Electric Double Layer Capacitors) hybrid EVs. This system is expected to reduce the loss and mass compared to a system with DC/DC chopper. When applying EDLCs as energy storage device, the energy management is essential through the whole operation of the motor because the energy density of EDLC is not so high and it can be charged only by the regenerative brake. In this paper, a method to manage energy of EDLC is proposed and it is examined by 1kW class experimental system.","PeriodicalId":6477,"journal":{"name":"2015 IEEE International Electric Machines & Drives Conference (IEMDC)","volume":"1 1","pages":"1488-1493"},"PeriodicalIF":0.0,"publicationDate":"2015-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89624839","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 : 2015-05-10DOI: 10.1109/IEMDC.2015.7409287
P. O'Regan, Ron Wang, S. Pekarek
This research introduces a model structured to facilitate the rigorous design of passive rectifier-based DC generating systems powered by wound rotor synchronous machines (WRSMs). The model includes provisions to consider WRSMs with arbitrary damper winding configurations and to represent the dynamics and mass/loss of the output filter. Multi-objective design studies have been performed to demonstrate the usefulness of the model and to highlight differences between machines optimized for DC systems and those intended for AC applications.
{"title":"Design of synchronous machines for DC power generation","authors":"P. O'Regan, Ron Wang, S. Pekarek","doi":"10.1109/IEMDC.2015.7409287","DOIUrl":"https://doi.org/10.1109/IEMDC.2015.7409287","url":null,"abstract":"This research introduces a model structured to facilitate the rigorous design of passive rectifier-based DC generating systems powered by wound rotor synchronous machines (WRSMs). The model includes provisions to consider WRSMs with arbitrary damper winding configurations and to represent the dynamics and mass/loss of the output filter. Multi-objective design studies have been performed to demonstrate the usefulness of the model and to highlight differences between machines optimized for DC systems and those intended for AC applications.","PeriodicalId":6477,"journal":{"name":"2015 IEEE International Electric Machines & Drives Conference (IEMDC)","volume":"27 2","pages":"1665-1670"},"PeriodicalIF":0.0,"publicationDate":"2015-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91427801","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 : 2015-05-10DOI: 10.1109/IEMDC.2015.7409268
T. Taj, H. Hasanien, A. Alolah
This paper presents the dynamic performance improvement of a wind energy conversion system (WECS) connected to a single machine infinite bus system using doubly-fed induction machine (DFIM)-based flywheel energy storage system (FESS). The continuously varying wind speed causes instabilities in the output power of the WECS. The use of FESS improves the dynamic response of the system and smoothes the output power of the WECS and during variable wind speeds. A DFIM-based FESS is proposed in this study which works on the cascaded black-box optimization technique based proportional-integral (PI) controller. The PI controllers are used to control the insulated gate bipolar transistor (IGBT) switches of the frequency converter. In-depth modeling and control strategy of the system under study is presented. The effectiveness of the proposed system is tested under real-time wind speed data. The validity of the system is verified by the simulation results which are carried out using PSCAD/EMTDC.
{"title":"Improving the dynamic performance of a grid-connected wind energy conversion system using flywheel energy storage system","authors":"T. Taj, H. Hasanien, A. Alolah","doi":"10.1109/IEMDC.2015.7409268","DOIUrl":"https://doi.org/10.1109/IEMDC.2015.7409268","url":null,"abstract":"This paper presents the dynamic performance improvement of a wind energy conversion system (WECS) connected to a single machine infinite bus system using doubly-fed induction machine (DFIM)-based flywheel energy storage system (FESS). The continuously varying wind speed causes instabilities in the output power of the WECS. The use of FESS improves the dynamic response of the system and smoothes the output power of the WECS and during variable wind speeds. A DFIM-based FESS is proposed in this study which works on the cascaded black-box optimization technique based proportional-integral (PI) controller. The PI controllers are used to control the insulated gate bipolar transistor (IGBT) switches of the frequency converter. In-depth modeling and control strategy of the system under study is presented. The effectiveness of the proposed system is tested under real-time wind speed data. The validity of the system is verified by the simulation results which are carried out using PSCAD/EMTDC.","PeriodicalId":6477,"journal":{"name":"2015 IEEE International Electric Machines & Drives Conference (IEMDC)","volume":"1 1","pages":"1545-1549"},"PeriodicalIF":0.0,"publicationDate":"2015-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91546143","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 : 2015-05-10DOI: 10.1109/IEMDC.2015.7409191
A. Banerjee, S. Leeb, J. Kirtley
Switched doubly-fed machine (DFM) drives can provide shaft speed control over a wide range without the need for a full power converter. Seamless shaft behavior across the complete speed range is achieved using a thyristor-based transfer switch in the stator of the DFM and appropriate control in the rotor converter. The drive must also operate without glitch with respect to the ac source. The seamless grid interaction is critical in applications such as in ship propulsion, where the drive may consume a major share of the generated power. This paper presents a coordinated control of the rotor converter that can ensure seamless operation for the switched-DFM drive with respect to the ac source. A laboratory setup emulating a ship microgrid is used to demonstrate the drive performance under different loading conditions.
{"title":"Seamless grid interaction for a switched doubly-fed machine propulsion drive","authors":"A. Banerjee, S. Leeb, J. Kirtley","doi":"10.1109/IEMDC.2015.7409191","DOIUrl":"https://doi.org/10.1109/IEMDC.2015.7409191","url":null,"abstract":"Switched doubly-fed machine (DFM) drives can provide shaft speed control over a wide range without the need for a full power converter. Seamless shaft behavior across the complete speed range is achieved using a thyristor-based transfer switch in the stator of the DFM and appropriate control in the rotor converter. The drive must also operate without glitch with respect to the ac source. The seamless grid interaction is critical in applications such as in ship propulsion, where the drive may consume a major share of the generated power. This paper presents a coordinated control of the rotor converter that can ensure seamless operation for the switched-DFM drive with respect to the ac source. A laboratory setup emulating a ship microgrid is used to demonstrate the drive performance under different loading conditions.","PeriodicalId":6477,"journal":{"name":"2015 IEEE International Electric Machines & Drives Conference (IEMDC)","volume":"29 1","pages":"1049-1055"},"PeriodicalIF":0.0,"publicationDate":"2015-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81997408","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 : 2015-05-10DOI: 10.1109/IEMDC.2015.7409278
Z. Xu, A. La Rocca, S. Pickering, C. Eastwick, C. Gerada, S. Bozhko
The paper describes the mechanical and thermal design of a high speed, high power density synchronous permanent magnet machine for an aero engine starter generator system with a power rating of 150 kW and maximum speed of 32,000 rpm. The electrical machine is designed to minimise the weight and maximise the efficiency so both mechanical and thermal aspects are considered. The cooling strategy adopts an inner stator sleeve for enhanced cooling of the stationary components whilst minimising the windage loss. Finite Element Analysis (FEA) is used for the static structural analyses of critical components of the machine and the dynamic performance of the rotating shaft. Heat transfer phenomena are also investigated by the means of Computational Fluid Dynamics (CFD) and Lumped Parameter Thermal Network (LPTN) for the optimisation of the proposed cooling arrangement and prediction of the machine temperature distribution.
{"title":"Mechanical and thermal design of an aeroengine starter/generator","authors":"Z. Xu, A. La Rocca, S. Pickering, C. Eastwick, C. Gerada, S. Bozhko","doi":"10.1109/IEMDC.2015.7409278","DOIUrl":"https://doi.org/10.1109/IEMDC.2015.7409278","url":null,"abstract":"The paper describes the mechanical and thermal design of a high speed, high power density synchronous permanent magnet machine for an aero engine starter generator system with a power rating of 150 kW and maximum speed of 32,000 rpm. The electrical machine is designed to minimise the weight and maximise the efficiency so both mechanical and thermal aspects are considered. The cooling strategy adopts an inner stator sleeve for enhanced cooling of the stationary components whilst minimising the windage loss. Finite Element Analysis (FEA) is used for the static structural analyses of critical components of the machine and the dynamic performance of the rotating shaft. Heat transfer phenomena are also investigated by the means of Computational Fluid Dynamics (CFD) and Lumped Parameter Thermal Network (LPTN) for the optimisation of the proposed cooling arrangement and prediction of the machine temperature distribution.","PeriodicalId":6477,"journal":{"name":"2015 IEEE International Electric Machines & Drives Conference (IEMDC)","volume":"41 1","pages":"1607-1613"},"PeriodicalIF":0.0,"publicationDate":"2015-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76207236","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 : 2015-05-10DOI: 10.1109/IEMDC.2015.7409112
J. C. Akiror, P. Pillay, A. Merkhouf
Uprating of hydro generators requires studies into the potential areas of failure like hotspots within the machine core. Rotational core losses cause localized heating of the core therefore understanding the distribution and behavior of rotational flux in the machine is key. This paper studies the distribution of rotational flux in a hydro generator as the core material is saturated. The percentage of rotational flux in the stator increases as the material is saturated especially for aspect ratios above 0.6. This can affect the loss distribution in the machine. Moreover experimental core loss data of non-sinusoidal flux densities in various parts of the machine at no load and full load operation are also presented.
{"title":"Effect of saturation on rotational flux distribution in hydro generators","authors":"J. C. Akiror, P. Pillay, A. Merkhouf","doi":"10.1109/IEMDC.2015.7409112","DOIUrl":"https://doi.org/10.1109/IEMDC.2015.7409112","url":null,"abstract":"Uprating of hydro generators requires studies into the potential areas of failure like hotspots within the machine core. Rotational core losses cause localized heating of the core therefore understanding the distribution and behavior of rotational flux in the machine is key. This paper studies the distribution of rotational flux in a hydro generator as the core material is saturated. The percentage of rotational flux in the stator increases as the material is saturated especially for aspect ratios above 0.6. This can affect the loss distribution in the machine. Moreover experimental core loss data of non-sinusoidal flux densities in various parts of the machine at no load and full load operation are also presented.","PeriodicalId":6477,"journal":{"name":"2015 IEEE International Electric Machines & Drives Conference (IEMDC)","volume":"3 1","pages":"550-554"},"PeriodicalIF":0.0,"publicationDate":"2015-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78469555","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 : 2015-05-10DOI: 10.1109/IEMDC.2015.7409218
A. Fatemi, D. Ionel, N. Demerdash
The conventional scaling rules for the optimal design of electric machines are best suited for naturally cooled machines with stator winding current densities less than 4A/mm2. In this paper, through a comprehensive sensitivity analysis, first, it is demonstrated that the correlations between some geometric variables and the performance metrics of interior permanent magnet (IPM) motors vary significantly with respect to the stator winding current density. For this purpose, three current densities are selected so as to approximately account for naturally cooled, fan-cooled and liquid-cooled machines. Subsequently, a parameterized IPM motor is optimized at these current densities through a large-scale design optimization algorithm by evaluating a total of 20,000 design candidates. The 100 best designs from each group are then identified and extracted to investigate the scaling rules for the optimal design of such IPM motors with different cooling systems. The outcomes of the study are in correspondence with the conventional design principles for naturally cooled machines. Nevertheless, it is illustrated that these rules vary for fan-cooled and liquid-cooled machines owing to the increased ampere loading, and also heavy saturation of the magnetic core in such machines. A configuration of a 50 hp, 48-slot, 8-pole IPM motor with a single-layer v-type magnet is used as the benchmark of this study.
{"title":"Identification of design rules for interior PM motors with different cooling systems","authors":"A. Fatemi, D. Ionel, N. Demerdash","doi":"10.1109/IEMDC.2015.7409218","DOIUrl":"https://doi.org/10.1109/IEMDC.2015.7409218","url":null,"abstract":"The conventional scaling rules for the optimal design of electric machines are best suited for naturally cooled machines with stator winding current densities less than 4A/mm2. In this paper, through a comprehensive sensitivity analysis, first, it is demonstrated that the correlations between some geometric variables and the performance metrics of interior permanent magnet (IPM) motors vary significantly with respect to the stator winding current density. For this purpose, three current densities are selected so as to approximately account for naturally cooled, fan-cooled and liquid-cooled machines. Subsequently, a parameterized IPM motor is optimized at these current densities through a large-scale design optimization algorithm by evaluating a total of 20,000 design candidates. The 100 best designs from each group are then identified and extracted to investigate the scaling rules for the optimal design of such IPM motors with different cooling systems. The outcomes of the study are in correspondence with the conventional design principles for naturally cooled machines. Nevertheless, it is illustrated that these rules vary for fan-cooled and liquid-cooled machines owing to the increased ampere loading, and also heavy saturation of the magnetic core in such machines. A configuration of a 50 hp, 48-slot, 8-pole IPM motor with a single-layer v-type magnet is used as the benchmark of this study.","PeriodicalId":6477,"journal":{"name":"2015 IEEE International Electric Machines & Drives Conference (IEMDC)","volume":"602 1","pages":"1228-1234"},"PeriodicalIF":0.0,"publicationDate":"2015-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77355893","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 : 2015-05-10DOI: 10.1109/IEMDC.2015.7409129
J. Druant, F. De Belie, P. Sergeant, J. Melkebeek
In a drive train a continuously variable transmission (CVT) has the advantage that the combustion engine can be driven in its optimal point along the requested power curve, which enhances overall efficiency. Moreover there is no power loss during shifting of gears which is often demanded in off highway applications. Several mechanical and hydraulic CVT's exist that have already proven their functionality, each having their pros and cons. This paper introduces the concept of an electromagnetic CVT which has some inherent advantages compared to mechanical systems being the absence of friction and the need for lubrication, only two moving parts and inherent overload protection. The machine can be seen as a conventional induction motor with two rotors. The rotors are arranged in a concentric way and are electromagnetically coupled. The working principle is explained, and an efficiency map is calculated for a scaled test case. It is concluded that with a smart choice of the interrotor flux a good efficiency can be achieved in a broad range of torque and flux of the interrotor.
{"title":"Concept study of a double rotor induction machine used as continuously variable transmission","authors":"J. Druant, F. De Belie, P. Sergeant, J. Melkebeek","doi":"10.1109/IEMDC.2015.7409129","DOIUrl":"https://doi.org/10.1109/IEMDC.2015.7409129","url":null,"abstract":"In a drive train a continuously variable transmission (CVT) has the advantage that the combustion engine can be driven in its optimal point along the requested power curve, which enhances overall efficiency. Moreover there is no power loss during shifting of gears which is often demanded in off highway applications. Several mechanical and hydraulic CVT's exist that have already proven their functionality, each having their pros and cons. This paper introduces the concept of an electromagnetic CVT which has some inherent advantages compared to mechanical systems being the absence of friction and the need for lubrication, only two moving parts and inherent overload protection. The machine can be seen as a conventional induction motor with two rotors. The rotors are arranged in a concentric way and are electromagnetically coupled. The working principle is explained, and an efficiency map is calculated for a scaled test case. It is concluded that with a smart choice of the interrotor flux a good efficiency can be achieved in a broad range of torque and flux of the interrotor.","PeriodicalId":6477,"journal":{"name":"2015 IEEE International Electric Machines & Drives Conference (IEMDC)","volume":"71 1","pages":"656-661"},"PeriodicalIF":0.0,"publicationDate":"2015-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73910665","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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