Pub Date : 2015-05-10DOI: 10.1109/IEMDC.2015.7409243
Jiangbiao He, A. Fatemi, N. Demerdash, D. Ionel
Stator winding short-circuit faults are among the most common faults that could occur in permanent magnet synchronous machines (PMSM). Therefore, on-line diagnosis of incipient stator winding short-circuit faults plays an important role contributing to the safe operation of PMSMs. However, the efficacy of known diagnostic methods varies with the types of stator winding configurations in PMSMs. This paper compares the effectiveness of diagnosis of stator winding short-circuit faults in series and parallel winding connections of PMSMs, with the same interior permanent-magnet rotor configuration. Two existing diagnostic methods have been applied to detect the severity of stator short-circuit faults happening in both series and parallel winding connection in PMSMs. Simulation analysis has been carried out in ANSYS Maxwell to compare the severity of magnetic saturation caused by equivalent short-circuit fault in series and parallel winding connected PMSMs. Experimental results lead to the conclusion that PMSMs with parallel winding connections can mask the influence of such stator short-circuit faults under certain circumstances, and thus it is more challenging to detect such incipient faults in parallel-winding-connected PMSM in comparison with series-winding-connected PMSMs.
{"title":"Diagnosis of stator short-circuit faults in series and parallel winding connections of closed-loop controlled PMSMs","authors":"Jiangbiao He, A. Fatemi, N. Demerdash, D. Ionel","doi":"10.1109/IEMDC.2015.7409243","DOIUrl":"https://doi.org/10.1109/IEMDC.2015.7409243","url":null,"abstract":"Stator winding short-circuit faults are among the most common faults that could occur in permanent magnet synchronous machines (PMSM). Therefore, on-line diagnosis of incipient stator winding short-circuit faults plays an important role contributing to the safe operation of PMSMs. However, the efficacy of known diagnostic methods varies with the types of stator winding configurations in PMSMs. This paper compares the effectiveness of diagnosis of stator winding short-circuit faults in series and parallel winding connections of PMSMs, with the same interior permanent-magnet rotor configuration. Two existing diagnostic methods have been applied to detect the severity of stator short-circuit faults happening in both series and parallel winding connection in PMSMs. Simulation analysis has been carried out in ANSYS Maxwell to compare the severity of magnetic saturation caused by equivalent short-circuit fault in series and parallel winding connected PMSMs. Experimental results lead to the conclusion that PMSMs with parallel winding connections can mask the influence of such stator short-circuit faults under certain circumstances, and thus it is more challenging to detect such incipient faults in parallel-winding-connected PMSM in comparison with series-winding-connected PMSMs.","PeriodicalId":6477,"journal":{"name":"2015 IEEE International Electric Machines & Drives Conference (IEMDC)","volume":"2 1","pages":"1387-1393"},"PeriodicalIF":0.0,"publicationDate":"2015-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87133338","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.2015.7409189
K. Tshiloz, S. Djukanović, S. Djurović
This paper investigates the development and realtime implementation of a dichotomous search algorithm based sensorless speed estimation technique in wound rotor induction machines. To this end the authors present the description of the structure and implementation of the technique proposed to extract the desired slip dependent frequency and hence the rotor speed information from the machine stator current spectrum. The performance of the presented algorithm in delivering estimation rate and accuracy improvements is then assessed and validated in real-time speed estimation tests undertaken on a 7.5 kW induction generator operating in the nominal and extended slip range.
{"title":"Real-time sensorless speed estimation in wound rotor induction machines using a dichotomous search algorithm","authors":"K. Tshiloz, S. Djukanović, S. Djurović","doi":"10.1109/IEMDC.2015.7409189","DOIUrl":"https://doi.org/10.1109/IEMDC.2015.7409189","url":null,"abstract":"This paper investigates the development and realtime implementation of a dichotomous search algorithm based sensorless speed estimation technique in wound rotor induction machines. To this end the authors present the description of the structure and implementation of the technique proposed to extract the desired slip dependent frequency and hence the rotor speed information from the machine stator current spectrum. The performance of the presented algorithm in delivering estimation rate and accuracy improvements is then assessed and validated in real-time speed estimation tests undertaken on a 7.5 kW induction generator operating in the nominal and extended slip range.","PeriodicalId":6477,"journal":{"name":"2015 IEEE International Electric Machines & Drives Conference (IEMDC)","volume":"9 1","pages":"1036-1042"},"PeriodicalIF":0.0,"publicationDate":"2015-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90296710","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.2015.7409247
Elham Pazouki, Seungdeog Choi
This paper investigates the application of multisensor fault feature extraction and fuzzy-logic based clustering for the condition monitoring of bearing. Multiple independent sensors on an electric motor drive system provide valuable early indication of a fault, and can be effectively utilized to perform high reliable and optimal fault detection. Through utilizing common sensors including current sensor and vibration sensors in motor, motor current signature analysis (MCSA) and vibration analysis have been used to extract the bearing fault energy. The discrete wavelet transform (DWT) has been applied to monitor energy of the bearing fault signals. Then, the fuzzy c-mean (FCM) has been developed to utilize the data from single sensor and multisensor to identify the severity of bearing fault. Extensive theoretical analysis and experimental test has been performed to demonstrate the advantages of proposed approach. The validity of this study has been confirmed through analysis of the 1/6 HP single phase induction motor and drive system.
{"title":"Fault diagnosis and condition monitoring of bearing using multisensory approach based fuzzy-logic clustering","authors":"Elham Pazouki, Seungdeog Choi","doi":"10.1109/IEMDC.2015.7409247","DOIUrl":"https://doi.org/10.1109/IEMDC.2015.7409247","url":null,"abstract":"This paper investigates the application of multisensor fault feature extraction and fuzzy-logic based clustering for the condition monitoring of bearing. Multiple independent sensors on an electric motor drive system provide valuable early indication of a fault, and can be effectively utilized to perform high reliable and optimal fault detection. Through utilizing common sensors including current sensor and vibration sensors in motor, motor current signature analysis (MCSA) and vibration analysis have been used to extract the bearing fault energy. The discrete wavelet transform (DWT) has been applied to monitor energy of the bearing fault signals. Then, the fuzzy c-mean (FCM) has been developed to utilize the data from single sensor and multisensor to identify the severity of bearing fault. Extensive theoretical analysis and experimental test has been performed to demonstrate the advantages of proposed approach. The validity of this study has been confirmed through analysis of the 1/6 HP single phase induction motor and drive system.","PeriodicalId":6477,"journal":{"name":"2015 IEEE International Electric Machines & Drives Conference (IEMDC)","volume":"61 1","pages":"1412-1418"},"PeriodicalIF":0.0,"publicationDate":"2015-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86000374","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.2015.7409075
Ayato Nihonyanagi, M. Takemoto, S. Ogasawara
In general engine generators, the engine and generator are separate units connected by a mechanical coupling. This tends to increase the package size of general engine generators. In this paper, we are able to achieve miniaturization and high output power of the generator by adopting an axial-gap structure through using ferrite permanent magnets. At the same time, the package size is reduced dramatically by integrating the axial-gap generator into the engine. This paper also discusses methods for reducing the eddy current losses that occur in the windings due to the open-slot structure of the stator core and occur in the rotor support component. By using results from three-dimensional finite element analysis, we show that the eddy current loss that occurs in the windings is reduced by using appropriate methods to wind the coils with rectangular wires. In addition, the eddy current loss that occurs in the rotor support component is decreased by appropriately selecting the material and changing the shape of the component. Experimental results show that the studied structure is effective for realizing miniaturization and high output power of the generator, as well as for decreasing the package size of the engine generator.
{"title":"Examination of an axial-gap generator with ferrite permanent magnets realizing miniaturization and high output power of engine generators","authors":"Ayato Nihonyanagi, M. Takemoto, S. Ogasawara","doi":"10.1109/IEMDC.2015.7409075","DOIUrl":"https://doi.org/10.1109/IEMDC.2015.7409075","url":null,"abstract":"In general engine generators, the engine and generator are separate units connected by a mechanical coupling. This tends to increase the package size of general engine generators. In this paper, we are able to achieve miniaturization and high output power of the generator by adopting an axial-gap structure through using ferrite permanent magnets. At the same time, the package size is reduced dramatically by integrating the axial-gap generator into the engine. This paper also discusses methods for reducing the eddy current losses that occur in the windings due to the open-slot structure of the stator core and occur in the rotor support component. By using results from three-dimensional finite element analysis, we show that the eddy current loss that occurs in the windings is reduced by using appropriate methods to wind the coils with rectangular wires. In addition, the eddy current loss that occurs in the rotor support component is decreased by appropriately selecting the material and changing the shape of the component. Experimental results show that the studied structure is effective for realizing miniaturization and high output power of the generator, as well as for decreasing the package size of the engine generator.","PeriodicalId":6477,"journal":{"name":"2015 IEEE International Electric Machines & Drives Conference (IEMDC)","volume":"1 1","pages":"300-307"},"PeriodicalIF":0.0,"publicationDate":"2015-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91004181","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.2015.7409100
K. Sakai, K. Matsuda, N. Yuzawa
To realize energy saving in electrical appliances and electric vehicles, it is necessary to reduce the power consumption of motors operating at variable speeds. We developed a technique that changes the poles of a permanent magnet (PM) motor depending on the speed. Here, we propose a novel PM motor that changes the number of poles without changing the winding connections and discuss its basic configurations and principles. Pole-changing is accomplished using the d-axis current of the proposed motor for magnetization. Our analysis results confirm that the pole-changing PM motor reduces iron loss by 36% over a conventional PM motor and increases efficiency over a wide range of speeds. Hence, the proposed motor is suitable for use in variable-speed drive systems to achieve high performance and efficiency.
{"title":"Permanent magnet motors capable of pole-changing without changing the connection of the windings for high efficiency","authors":"K. Sakai, K. Matsuda, N. Yuzawa","doi":"10.1109/IEMDC.2015.7409100","DOIUrl":"https://doi.org/10.1109/IEMDC.2015.7409100","url":null,"abstract":"To realize energy saving in electrical appliances and electric vehicles, it is necessary to reduce the power consumption of motors operating at variable speeds. We developed a technique that changes the poles of a permanent magnet (PM) motor depending on the speed. Here, we propose a novel PM motor that changes the number of poles without changing the winding connections and discuss its basic configurations and principles. Pole-changing is accomplished using the d-axis current of the proposed motor for magnetization. Our analysis results confirm that the pole-changing PM motor reduces iron loss by 36% over a conventional PM motor and increases efficiency over a wide range of speeds. Hence, the proposed motor is suitable for use in variable-speed drive systems to achieve high performance and efficiency.","PeriodicalId":6477,"journal":{"name":"2015 IEEE International Electric Machines & Drives Conference (IEMDC)","volume":"1 1","pages":"468-474"},"PeriodicalIF":0.0,"publicationDate":"2015-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91095280","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.2015.7409099
H. Hua, Z. Zhu, M. Zheng, Z. Wu, D. Wu, X. Ge
Partitioned stator (PS) machines employ two separate stators to accommodate armature windings and permanent magnets (PMs) respectively, alleviating the stator space conflict in stator-PM machines and hence significantly boosting the torque density. However, the PM usage volume of PS machines is relatively large and the cost is high, which is undesirable for cost sensitive applications. In this paper, a PS machine employing ferrite PMs is presented, which can take the advantage of large space for PMs in PS machines as well as balance the performance and cost. The electromagnetic characteristics of an optimized ferrite PS machine and an optimized NdFeB PS machine are compared, together with a classic Prius2010 interior-PM (IPM) machine as a baseline for comparison. In addition, the economic issues are considered as well. The predicted results reveal that the NdFeB PS machine can produce much higher torque density but is more expensive than the Prius2010 IPM machine, whilst the ferrite PS machine can significantly reduce the cost and still exhibit comparable performance as the Prius2010 IPM machine and the highest torque per cost. The demagnetization behavior of ferrite PS machine is evaluated and a method to improve the demagnetization withstand capability is proposed. A pair of scaled prototypes are manufactured to validate the finite element predictions.
{"title":"Performance comparison of partitioned stator machines with NdFeB and ferrite magnets","authors":"H. Hua, Z. Zhu, M. Zheng, Z. Wu, D. Wu, X. Ge","doi":"10.1109/IEMDC.2015.7409099","DOIUrl":"https://doi.org/10.1109/IEMDC.2015.7409099","url":null,"abstract":"Partitioned stator (PS) machines employ two separate stators to accommodate armature windings and permanent magnets (PMs) respectively, alleviating the stator space conflict in stator-PM machines and hence significantly boosting the torque density. However, the PM usage volume of PS machines is relatively large and the cost is high, which is undesirable for cost sensitive applications. In this paper, a PS machine employing ferrite PMs is presented, which can take the advantage of large space for PMs in PS machines as well as balance the performance and cost. The electromagnetic characteristics of an optimized ferrite PS machine and an optimized NdFeB PS machine are compared, together with a classic Prius2010 interior-PM (IPM) machine as a baseline for comparison. In addition, the economic issues are considered as well. The predicted results reveal that the NdFeB PS machine can produce much higher torque density but is more expensive than the Prius2010 IPM machine, whilst the ferrite PS machine can significantly reduce the cost and still exhibit comparable performance as the Prius2010 IPM machine and the highest torque per cost. The demagnetization behavior of ferrite PS machine is evaluated and a method to improve the demagnetization withstand capability is proposed. A pair of scaled prototypes are manufactured to validate the finite element predictions.","PeriodicalId":6477,"journal":{"name":"2015 IEEE International Electric Machines & Drives Conference (IEMDC)","volume":"16 1","pages":"461-467"},"PeriodicalIF":0.0,"publicationDate":"2015-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73715837","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.2015.7409213
E. Cosoroaba, B. Fahimi
Magnetohydrodynamic power generation (MHDG) was a thriving field of research in the 1960s but low efficiency and difficulty to reach desired operating points (high temperature) discouraged the investment of further efforts in the matter. Nowadays technological advances such as superconducting electromagnets (with very low power consumption for higher overall efficiency), power electronics (to enable harvesting and processing of current intensive DC power for any application), and powerful multiphysics simulation software, call for a reassessment of this power generation method. The aim of this paper is to deliver a realistic analysis of the competitiveness of MHDG as well as the possibilities offered by design variables to improve its attributes. Finite element analysis offers an improved understanding of field and flow distribution as well as the power density generated within the fluid channel. Analytical energy efficiency determination is completed for two different fluids as well as a sensitivity study of influential design factors. Furthermore a power output/cost comparison between MHD-systems operating with combustion gasses and liquid copper is carried out to offer a complete assessment of MHDG.
{"title":"Efficiency oriented design guidelines for a magnetohydrodynamic generator system","authors":"E. Cosoroaba, B. Fahimi","doi":"10.1109/IEMDC.2015.7409213","DOIUrl":"https://doi.org/10.1109/IEMDC.2015.7409213","url":null,"abstract":"Magnetohydrodynamic power generation (MHDG) was a thriving field of research in the 1960s but low efficiency and difficulty to reach desired operating points (high temperature) discouraged the investment of further efforts in the matter. Nowadays technological advances such as superconducting electromagnets (with very low power consumption for higher overall efficiency), power electronics (to enable harvesting and processing of current intensive DC power for any application), and powerful multiphysics simulation software, call for a reassessment of this power generation method. The aim of this paper is to deliver a realistic analysis of the competitiveness of MHDG as well as the possibilities offered by design variables to improve its attributes. Finite element analysis offers an improved understanding of field and flow distribution as well as the power density generated within the fluid channel. Analytical energy efficiency determination is completed for two different fluids as well as a sensitivity study of influential design factors. Furthermore a power output/cost comparison between MHD-systems operating with combustion gasses and liquid copper is carried out to offer a complete assessment of MHDG.","PeriodicalId":6477,"journal":{"name":"2015 IEEE International Electric Machines & Drives Conference (IEMDC)","volume":"55 1","pages":"1197-1201"},"PeriodicalIF":0.0,"publicationDate":"2015-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73569446","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}
Pub Date : 2015-05-10DOI: 10.1109/IEMDC.2015.7409240
Bram Corne, B. Vervisch, C. Debruyne, J. Knockaert, J. Desmet
Condition Monitoring on rotating electrical machines has proven to be economically beneficial in the last decades, especially for industrial production processes. Vibration analysis has already become a reliable and commercial tool to perform condition monitoring or predictive maintenance. Stator current analysis, a newer technology that is still being developed can possibly open new perspectives and opportunities in the world of predictive maintenance. This technology is also known as Motor Current Signature Analysis or MCSA. In this paper the advantages and disadvantages of both technologies are listed and compared from a practical point of view, supplemented with a case study. The case study contains a bearing fault detection in an induction machine driven by a frequency converter. The machine drives a fan with varying torque and speed conditions.
{"title":"Comparing MCSA with vibration analysis in order to detect bearing faults — A case study","authors":"Bram Corne, B. Vervisch, C. Debruyne, J. Knockaert, J. Desmet","doi":"10.1109/IEMDC.2015.7409240","DOIUrl":"https://doi.org/10.1109/IEMDC.2015.7409240","url":null,"abstract":"Condition Monitoring on rotating electrical machines has proven to be economically beneficial in the last decades, especially for industrial production processes. Vibration analysis has already become a reliable and commercial tool to perform condition monitoring or predictive maintenance. Stator current analysis, a newer technology that is still being developed can possibly open new perspectives and opportunities in the world of predictive maintenance. This technology is also known as Motor Current Signature Analysis or MCSA. In this paper the advantages and disadvantages of both technologies are listed and compared from a practical point of view, supplemented with a case study. The case study contains a bearing fault detection in an induction machine driven by a frequency converter. The machine drives a fan with varying torque and speed conditions.","PeriodicalId":6477,"journal":{"name":"2015 IEEE International Electric Machines & Drives Conference (IEMDC)","volume":"47 1","pages":"1366-1372"},"PeriodicalIF":0.0,"publicationDate":"2015-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74127473","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}
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