Pub Date : 2018-09-01DOI: 10.1109/icelmach.2018.8506762
{"title":"Electrical Drives","authors":"","doi":"10.1109/icelmach.2018.8506762","DOIUrl":"https://doi.org/10.1109/icelmach.2018.8506762","url":null,"abstract":"","PeriodicalId":292261,"journal":{"name":"2018 XIII International Conference on Electrical Machines (ICEM)","volume":"81 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133049383","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 : 2018-09-01DOI: 10.1109/ICELMACH.2018.8506849
Ming Ye, Jin Huang
Bearing faults are one of the major causes of motor failures. The vibration or current signals are the most commonly used in bearing fault diagnosis (BFD). However, their applications are also limited by some disadvantages. This study addresses a novel BFD method based on speed sensorless observer and angular resample(AR). Based on the analysis of the effect on the rotor speed signal caused by bearing faults in permanent magnetic synchronous machine (PMSM), a speed sensorless observer is designed to obtain the rotor angle and speed for reducing the cost and maintenance of the optical encoder. The angle and speed signal are pre-processed to fit the demand of the AR method, and the angle signal is used to resample the non-stationary speed signal into a stationary one in angular domain for the order spectrum analysis. The existence of excitation at the bearing fault characteristic order in the spectrum of the resampled signal is used for fault diagnosis. Experimental studies are carried out in both speed-varying and torque-varying conditions to demonstrate the effectiveness of the proposed method for the detection of bearing faults of PMSM.
{"title":"Bearing Fault Diagnosis Under Time-Varying Speed and Load Conditions via Speed Sensorless Algorithm and Angular Resample","authors":"Ming Ye, Jin Huang","doi":"10.1109/ICELMACH.2018.8506849","DOIUrl":"https://doi.org/10.1109/ICELMACH.2018.8506849","url":null,"abstract":"Bearing faults are one of the major causes of motor failures. The vibration or current signals are the most commonly used in bearing fault diagnosis (BFD). However, their applications are also limited by some disadvantages. This study addresses a novel BFD method based on speed sensorless observer and angular resample(AR). Based on the analysis of the effect on the rotor speed signal caused by bearing faults in permanent magnetic synchronous machine (PMSM), a speed sensorless observer is designed to obtain the rotor angle and speed for reducing the cost and maintenance of the optical encoder. The angle and speed signal are pre-processed to fit the demand of the AR method, and the angle signal is used to resample the non-stationary speed signal into a stationary one in angular domain for the order spectrum analysis. The existence of excitation at the bearing fault characteristic order in the spectrum of the resampled signal is used for fault diagnosis. Experimental studies are carried out in both speed-varying and torque-varying conditions to demonstrate the effectiveness of the proposed method for the detection of bearing faults of PMSM.","PeriodicalId":292261,"journal":{"name":"2018 XIII International Conference on Electrical Machines (ICEM)","volume":"114 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122960168","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 : 2018-09-01DOI: 10.1109/ICELMACH.2018.8506816
O. Kokoko, A. Merkhouf, A. Tounzi, Mounir Essalhi, E. Guillot, B. Kedjar, K. Al- Haddad
A method for detecting inter-turn short circuit in the rotor field winding of a large hydro generator is presented. The proposed method is based on the use of two inductive probes installed at two different locations in the machine, exploiting therefore the existing magnetic symmetry. This latter consists of monitoring the algebraic sum of the two induced voltages of these two probes. The studied hydro generator has a rating of 310 MVA with 408 slots and 56 poles. Many advanced electromagnetic simulations based on finite element method were carried out in order to validate the proposed approach. The simulation results were compared to the experimentally measured data collected of the considered generator and obtained respectively at no-load and rated load.
{"title":"Detection of Short Circuits in the Rotor Field Winding in Large Hydro Generator","authors":"O. Kokoko, A. Merkhouf, A. Tounzi, Mounir Essalhi, E. Guillot, B. Kedjar, K. Al- Haddad","doi":"10.1109/ICELMACH.2018.8506816","DOIUrl":"https://doi.org/10.1109/ICELMACH.2018.8506816","url":null,"abstract":"A method for detecting inter-turn short circuit in the rotor field winding of a large hydro generator is presented. The proposed method is based on the use of two inductive probes installed at two different locations in the machine, exploiting therefore the existing magnetic symmetry. This latter consists of monitoring the algebraic sum of the two induced voltages of these two probes. The studied hydro generator has a rating of 310 MVA with 408 slots and 56 poles. Many advanced electromagnetic simulations based on finite element method were carried out in order to validate the proposed approach. The simulation results were compared to the experimentally measured data collected of the considered generator and obtained respectively at no-load and rated load.","PeriodicalId":292261,"journal":{"name":"2018 XIII International Conference on Electrical Machines (ICEM)","volume":"143 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115806001","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 : 2018-09-01DOI: 10.1109/icelmach.2018.8507185
{"title":"Thermal, Losses and Efficiency Issues","authors":"","doi":"10.1109/icelmach.2018.8507185","DOIUrl":"https://doi.org/10.1109/icelmach.2018.8507185","url":null,"abstract":"","PeriodicalId":292261,"journal":{"name":"2018 XIII International Conference on Electrical Machines (ICEM)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129593841","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 : 2018-09-01DOI: 10.1109/ICELMACH.2018.8507094
A. Reinap, F. Márquez-Fernández, M. Alaküla, R. Deodhar, K. Mishima
This paper presents and assesses the cooling integration of electrical machines with concentrated windings. A conventional coil in a concentrated winding with forced cooling applied on the exterior coil surfaces is replaced by an alternative solution where the coil is opened up in a laminar structure with the intention of the coolant fluid penetrating the coil and removing the interior heat. This is a purely theoretical study where a set of FE models are used to evaluate the torque capability under elevated thermal loads, comparing conventional to alternative cooling integration topologies. The objective of the unsophisticated FE evaluation models and simple design rules is to demonstrate the potential of the laminated type of windings where the space between the current carrying flat conductors is used to circulate coolant so that the heat losses are removed in the vicinity of where they are generated. Conjugate heat transfer analysis in Comsol multiphysics based on 2D and 3D is used to demonstrate the cooling capability for air and oil cooled windings up to thermal loads corresponding to 50 A/mm2at 24 nΩm and a target hot spot temperature of 120°C for copper.
{"title":"Direct Conductor Cooling in Concentrated Windings","authors":"A. Reinap, F. Márquez-Fernández, M. Alaküla, R. Deodhar, K. Mishima","doi":"10.1109/ICELMACH.2018.8507094","DOIUrl":"https://doi.org/10.1109/ICELMACH.2018.8507094","url":null,"abstract":"This paper presents and assesses the cooling integration of electrical machines with concentrated windings. A conventional coil in a concentrated winding with forced cooling applied on the exterior coil surfaces is replaced by an alternative solution where the coil is opened up in a laminar structure with the intention of the coolant fluid penetrating the coil and removing the interior heat. This is a purely theoretical study where a set of FE models are used to evaluate the torque capability under elevated thermal loads, comparing conventional to alternative cooling integration topologies. The objective of the unsophisticated FE evaluation models and simple design rules is to demonstrate the potential of the laminated type of windings where the space between the current carrying flat conductors is used to circulate coolant so that the heat losses are removed in the vicinity of where they are generated. Conjugate heat transfer analysis in Comsol multiphysics based on 2D and 3D is used to demonstrate the cooling capability for air and oil cooled windings up to thermal loads corresponding to 50 A/mm2at 24 nΩm and a target hot spot temperature of 120°C for copper.","PeriodicalId":292261,"journal":{"name":"2018 XIII International Conference on Electrical Machines (ICEM)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124836410","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 : 2018-09-01DOI: 10.1109/ICELMACH.2018.8507195
Ya Li, Hui Yang, Heyun Lin, S. Lyu
In this paper, the torque production mechanism of consequent pole permanent magnet (CPPM) machines is analyzed from the perspective of field modulation effect (FME). In order to reveal the working harmonics in CPPM machines, a simplified permeance model is established accounting for stator slotting effect. The Maxwell stress tensor method is utilized to provide the insight of the effective harmonics contributing to the torque production in CPPM machines. Based on the finite element (FE) method, four CPPM and four surface-PM (SPM) machines with different rotor pole pairs and single- or double-layer concentrated windings, are analyzed and compared. It is shown that the FME in CPPM machines contributes more the electromagnetic torque than its SPM counterparts.
{"title":"Analysis of Field Modulation Effect in Consequent Pole Permanent Magnet Machines with Concentrated Windings","authors":"Ya Li, Hui Yang, Heyun Lin, S. Lyu","doi":"10.1109/ICELMACH.2018.8507195","DOIUrl":"https://doi.org/10.1109/ICELMACH.2018.8507195","url":null,"abstract":"In this paper, the torque production mechanism of consequent pole permanent magnet (CPPM) machines is analyzed from the perspective of field modulation effect (FME). In order to reveal the working harmonics in CPPM machines, a simplified permeance model is established accounting for stator slotting effect. The Maxwell stress tensor method is utilized to provide the insight of the effective harmonics contributing to the torque production in CPPM machines. Based on the finite element (FE) method, four CPPM and four surface-PM (SPM) machines with different rotor pole pairs and single- or double-layer concentrated windings, are analyzed and compared. It is shown that the FME in CPPM machines contributes more the electromagnetic torque than its SPM counterparts.","PeriodicalId":292261,"journal":{"name":"2018 XIII International Conference on Electrical Machines (ICEM)","volume":"83 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129134659","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 : 2018-09-01DOI: 10.1109/ICELMACH.2018.8507165
Amina Bensalah, M. A. Benhamida, G. Barakat, Y. Amara
This paper presents a broad overview of wind energy conversion generators in muti-megawatts wind turbines. Both technological and economic advantages and drawbacks of each generator system technology (geared and gearless) are detailed. Moreover, comparison based on weight, diameter, cost, energy yield and axial length between different electrical generators is discussed. This comparison helps us to find the suitable structure of generator system for high-power wind turbines. Additionally, recent developments on generators are introduced including some examples of their implementation in ultra-large operational wind turbines. Finally, this review could help to understand the potential future choices in the design of wind turbine energy conversion systems.
{"title":"Large wind turbine generators: State-of-the-art review","authors":"Amina Bensalah, M. A. Benhamida, G. Barakat, Y. Amara","doi":"10.1109/ICELMACH.2018.8507165","DOIUrl":"https://doi.org/10.1109/ICELMACH.2018.8507165","url":null,"abstract":"This paper presents a broad overview of wind energy conversion generators in muti-megawatts wind turbines. Both technological and economic advantages and drawbacks of each generator system technology (geared and gearless) are detailed. Moreover, comparison based on weight, diameter, cost, energy yield and axial length between different electrical generators is discussed. This comparison helps us to find the suitable structure of generator system for high-power wind turbines. Additionally, recent developments on generators are introduced including some examples of their implementation in ultra-large operational wind turbines. Finally, this review could help to understand the potential future choices in the design of wind turbine energy conversion systems.","PeriodicalId":292261,"journal":{"name":"2018 XIII International Conference on Electrical Machines (ICEM)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134103337","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 : 2018-09-01DOI: 10.1109/ICELMACH.2018.8507182
G. D. Petropol Serb, I. P. Serb
The aim of this paper is to propose a numerical method to transform a given experimental data maps into a polynomial based regression model, used to estimate the induced back e.m.f voltage form factor for a salient synchronous generator. The subroutine is a part of a Computer Aided Designing developed by the Authors for a salient synchronous generator used in railway traction. By using Newton's interpolation, the first step is to plot the graphical representation of the dependence between induced back e.m.f voltage form factor, kB, and real covering factor of the slot pitch, αp. The next stage is to create a graphical interface in Matlab to allow an easiest interaction between operator and computer. The final task is to transfer this interpolated values (kB, αp) in a *. txt file to be use by the others subroutines of the program. Subroutine could be use by a design optimization program.
{"title":"Newton's Interpolation Applied in the Practice of Designing a Salient Synchronous Generator","authors":"G. D. Petropol Serb, I. P. Serb","doi":"10.1109/ICELMACH.2018.8507182","DOIUrl":"https://doi.org/10.1109/ICELMACH.2018.8507182","url":null,"abstract":"The aim of this paper is to propose a numerical method to transform a given experimental data maps into a polynomial based regression model, used to estimate the induced back e.m.f voltage form factor for a salient synchronous generator. The subroutine is a part of a Computer Aided Designing developed by the Authors for a salient synchronous generator used in railway traction. By using Newton's interpolation, the first step is to plot the graphical representation of the dependence between induced back e.m.f voltage form factor, kB, and real covering factor of the slot pitch, αp. The next stage is to create a graphical interface in Matlab to allow an easiest interaction between operator and computer. The final task is to transfer this interpolated values (kB, αp) in a *. txt file to be use by the others subroutines of the program. Subroutine could be use by a design optimization program.","PeriodicalId":292261,"journal":{"name":"2018 XIII International Conference on Electrical Machines (ICEM)","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134644069","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 : 2018-09-01DOI: 10.1109/ICELMACH.2018.8507076
C. Alteheld, R. Gottkehaskamp, A. Möckel
An analytical calculation model of an induction machine with combined star-delta windings and squirrel cage rotors taking into account multiple armature reaction, slot openings and saturation is presented. The model bases on the harmonic field theory and makes it possible to calculate the steady-state behaviour including harmonic currents in stator and rotor as well as parasitic torque components. Furthermore, every phase is considered seperately which permits to analyse different connections in detail. It is to mention that the model is also valid for regular six-phase machines. The derivation of the model with all its simplifications and assumptions as well as the consideration of saturation are discussed. The analytical calculation model is compared to the results of a transient FEM considering iron saturation as well as measurements to verify its validity. Moreover, the paper presents another method to substitute integral slot windings of three-phase machines with an uneven number of slots per pole per phase with combined star delta windings. Also, the paper compares the performance characteristics of the combined star-delta winding in series and parallel connection with a three-phase and a true six-phase winding.
{"title":"Analytical Calculation Model of an Induction Machine with Combined Star-Delta Windings and Analysis of Possible Connections","authors":"C. Alteheld, R. Gottkehaskamp, A. Möckel","doi":"10.1109/ICELMACH.2018.8507076","DOIUrl":"https://doi.org/10.1109/ICELMACH.2018.8507076","url":null,"abstract":"An analytical calculation model of an induction machine with combined star-delta windings and squirrel cage rotors taking into account multiple armature reaction, slot openings and saturation is presented. The model bases on the harmonic field theory and makes it possible to calculate the steady-state behaviour including harmonic currents in stator and rotor as well as parasitic torque components. Furthermore, every phase is considered seperately which permits to analyse different connections in detail. It is to mention that the model is also valid for regular six-phase machines. The derivation of the model with all its simplifications and assumptions as well as the consideration of saturation are discussed. The analytical calculation model is compared to the results of a transient FEM considering iron saturation as well as measurements to verify its validity. Moreover, the paper presents another method to substitute integral slot windings of three-phase machines with an uneven number of slots per pole per phase with combined star delta windings. Also, the paper compares the performance characteristics of the combined star-delta winding in series and parallel connection with a three-phase and a true six-phase winding.","PeriodicalId":292261,"journal":{"name":"2018 XIII International Conference on Electrical Machines (ICEM)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131829001","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 : 2018-09-01DOI: 10.1109/ICELMACH.2018.8507253
R. Benlamine, T. Hamiti, F. Vangraefschepe, D. Lhotellier
This paper presents a comparative study of different high-speed 36-slots/4poles machines for turbogenerator application based on electromagnetic and mechanical finite-element analysis (FEA). The studied machines have the same stator with distributed winding and different rotor structures. The electromagnetic performances are analyzed and compared, as well as the mechanical stress in the rotors. The selected machine with the best rotor structure has been analyzed. Furthermore, thermal analysis of the chosen machine has been performed considering transient and steady-state operating points. The maximum temperature increase is located in the slots but it remains acceptable for a safe operation.
{"title":"Electromagnetic, Structural and Thermal Analyses of High-Speed PM Machines for Aircraft Application","authors":"R. Benlamine, T. Hamiti, F. Vangraefschepe, D. Lhotellier","doi":"10.1109/ICELMACH.2018.8507253","DOIUrl":"https://doi.org/10.1109/ICELMACH.2018.8507253","url":null,"abstract":"This paper presents a comparative study of different high-speed 36-slots/4poles machines for turbogenerator application based on electromagnetic and mechanical finite-element analysis (FEA). The studied machines have the same stator with distributed winding and different rotor structures. The electromagnetic performances are analyzed and compared, as well as the mechanical stress in the rotors. The selected machine with the best rotor structure has been analyzed. Furthermore, thermal analysis of the chosen machine has been performed considering transient and steady-state operating points. The maximum temperature increase is located in the slots but it remains acceptable for a safe operation.","PeriodicalId":292261,"journal":{"name":"2018 XIII International Conference on Electrical Machines (ICEM)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132511223","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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