The paper presents a new four-quadrant converter based on dual-winding isolated Cuk converters. The proposed converter can operate as a DC/DC converter, DC/AC inverter or AC/DC rectifier. The new converter offers important merits such as losses reduction, voltage boosting, flexible output voltage range, passive element reduction and galvanic isolation with small-size high-frequency transformers. If the proposed converter output is applied to a DC motor, providing the possibility of motoring, braking and regenerative braking if required. In addition, the converter offers the possibility to generate AC voltages and currents if it is employed in renewable energy systems as a DC/AC inverter. The paper presents the description of the converter with the associated mathematical analysis. Simulation results are obtained using MATLAB/SIMULINK software while experimental results are obtained using a scaled down prototype, controlled by TMS320F28335DSP.
{"title":"A NEW FOUR-QUADRANT INVERTER BASED ON DUAL-WINDING ISOLATED CUK CONVERTERS FOR RAILWAY AND RENEWABLE ENERGY APPLICATIONS","authors":"S. Alotaibi, A. Darwish, X. Ma, B. Williams","doi":"10.1049/icp.2021.1033","DOIUrl":"https://doi.org/10.1049/icp.2021.1033","url":null,"abstract":"The paper presents a new four-quadrant converter based on dual-winding isolated Cuk converters. The proposed converter can operate as a DC/DC converter, DC/AC inverter or AC/DC rectifier. The new converter offers important merits such as losses reduction, voltage boosting, flexible output voltage range, passive element reduction and galvanic isolation with small-size high-frequency transformers. If the proposed converter output is applied to a DC motor, providing the possibility of motoring, braking and regenerative braking if required. In addition, the converter offers the possibility to generate AC voltages and currents if it is employed in renewable energy systems as a DC/AC inverter. The paper presents the description of the converter with the associated mathematical analysis. Simulation results are obtained using MATLAB/SIMULINK software while experimental results are obtained using a scaled down prototype, controlled by TMS320F28335DSP.","PeriodicalId":188371,"journal":{"name":"The 10th International Conference on Power Electronics, Machines and Drives (PEMD 2020)","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121671630","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}
Since temperature rise in electric machines is mainly due to power losses during electro-mechanical power conversion, temperature estimation is highly attached to power loss modelling. In this contribution, an extended iron loss model is introduced with a direct identification methodology in the context of temperature estimation. The iron loss model is implemented as part of a fourthorder lumped-parameter thermal network (LPTN), which is parametrised using empirical measurements and global identification. Once parameters are identified using training data, the LPTN model is validated using three unseen profiles cross-validation. Satisfactory estimation is achieved with the average mean squared error of 2.1 K2 and the error bias close to zero.
{"title":"PERMANENT MAGNET SYNCHRONOUS MACHINE TEMPERATURE ESTIMATION USING LOW-ORDER LUMPED-PARAMETER THERMAL NETWORK WITH EXTENDED IRON LOSS MODEL","authors":"E. Gedlu, O. Wallscheid, J. Böcker","doi":"10.1049/icp.2021.1017","DOIUrl":"https://doi.org/10.1049/icp.2021.1017","url":null,"abstract":"Since temperature rise in electric machines is mainly due to power losses during electro-mechanical power conversion, temperature estimation is highly attached to power loss modelling. In this contribution, an extended iron loss model is introduced with a direct identification methodology in the context of temperature estimation. The iron loss model is implemented as part of a fourthorder lumped-parameter thermal network (LPTN), which is parametrised using empirical measurements and global identification. Once parameters are identified using training data, the LPTN model is validated using three unseen profiles cross-validation. Satisfactory estimation is achieved with the average mean squared error of 2.1 K2 and the error bias close to zero.","PeriodicalId":188371,"journal":{"name":"The 10th International Conference on Power Electronics, Machines and Drives (PEMD 2020)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132482531","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}
R. Kumar, L. Huang, D. K. K. Padinharu, Z. Zhu, A. Duke, R. Clark, A. Thomas, G. Li, M. Odavic, A. Griffo, M. Foster, D. Stone
This paper is devoted to three dimensional (3D) finite element method (FEM) based examination of the interphase magnetic coupling in a three-phase transverse flux machine (TFM). The comprehensive analysis shows that the axially stacked phases are magnetically coupled, which leads to an unbalanced contribution of torque from each phase and therefore a reduced value of resulting three-phase torque. This issue can be addressed by introducing an axial air gap in the rotor back-iron between the phase modules or selecting a proper magnet arrangement. Following a discussion of different magnet arrangements, it is found that the optimal combination is dependent on the flux patterns produced by the armature reaction and the magnets.
{"title":"IMPACT OF MAGNETIC COUPLING IN TRANSVERSE FLUX PERMANENT MAGNET MACHINE FOR WIND POWER APPLICATION","authors":"R. Kumar, L. Huang, D. K. K. Padinharu, Z. Zhu, A. Duke, R. Clark, A. Thomas, G. Li, M. Odavic, A. Griffo, M. Foster, D. Stone","doi":"10.1049/icp.2021.1007","DOIUrl":"https://doi.org/10.1049/icp.2021.1007","url":null,"abstract":"This paper is devoted to three dimensional (3D) finite element method (FEM) based examination of the interphase magnetic coupling in a three-phase transverse flux machine (TFM). The comprehensive analysis shows that the axially stacked phases are magnetically coupled, which leads to an unbalanced contribution of torque from each phase and therefore a reduced value of resulting three-phase torque. This issue can be addressed by introducing an axial air gap in the rotor back-iron between the phase modules or selecting a proper magnet arrangement. Following a discussion of different magnet arrangements, it is found that the optimal combination is dependent on the flux patterns produced by the armature reaction and the magnets.","PeriodicalId":188371,"journal":{"name":"The 10th International Conference on Power Electronics, Machines and Drives (PEMD 2020)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127341008","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}
M. Al-Ani, S. La Rocca, A. La Rocca, A. Walker, R. Ramanathan, T. Zou, G. Vakil, D. Gerada, C. Gerada, K. Paciura, A. McQueen
Electrical machines designed for automotive applications are characterised by high torque density, wide speed range and low cost. The use of NdFeB magnets in such machines can achieve the required high torque density and wide speed range, however, it fails to meet the low-cost requirements. As a result, this paper explores the capability of rare-earth-free design through a PM-assisted synchronous reluctance motor (PM-SynRel). A PM-SynRel design with NdFeB has been used in this study where the NdFeB magnets have been replaced with ferrite magnets. Following, mechanical analysis has been conducted on the rotor to ensure the stress level in the rotor does not exceed the material limit. Therefore, several mechanical methods have been studied to evaluate their mechanical capability and electromagnetic performance degradation. Thermal analysis has been conducted last to evaluate the temperatures in the different machine parts to avoid exceeding the required limits. Detailed numerical thermal analyses were also performed to assess the thermal behaviour of the design developed. Finally, a prototype has been made and tested to validate the simulation results.
{"title":"Design of Rare-Earth-Free PM-assisted Synchronous Reluctance Machine for Heavy-duty Automotive Application","authors":"M. Al-Ani, S. La Rocca, A. La Rocca, A. Walker, R. Ramanathan, T. Zou, G. Vakil, D. Gerada, C. Gerada, K. Paciura, A. McQueen","doi":"10.1049/icp.2021.1193","DOIUrl":"https://doi.org/10.1049/icp.2021.1193","url":null,"abstract":"Electrical machines designed for automotive applications are characterised by high torque density, wide speed range and low cost. The use of NdFeB magnets in such machines can achieve the required high torque density and wide speed range, however, it fails to meet the low-cost requirements. As a result, this paper explores the capability of rare-earth-free design through a PM-assisted synchronous reluctance motor (PM-SynRel). A PM-SynRel design with NdFeB has been used in this study where the NdFeB magnets have been replaced with ferrite magnets. Following, mechanical analysis has been conducted on the rotor to ensure the stress level in the rotor does not exceed the material limit. Therefore, several mechanical methods have been studied to evaluate their mechanical capability and electromagnetic performance degradation. Thermal analysis has been conducted last to evaluate the temperatures in the different machine parts to avoid exceeding the required limits. Detailed numerical thermal analyses were also performed to assess the thermal behaviour of the design developed. Finally, a prototype has been made and tested to validate the simulation results.","PeriodicalId":188371,"journal":{"name":"The 10th International Conference on Power Electronics, Machines and Drives (PEMD 2020)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116102157","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}
The Stator slot permanent magnet (PM) machine with PMs placed circumferentially in the slot openings is inherently fault-tolerant under the uncontrolled generator operation since the PM flux is short-circuited within the stator. However, as the PMs are placed in the slot openings and adjacent to the high-permeability iron core, the tangential flux component may cause partial demagnetization of magnets, especially under heavy load condition. In this paper, the influence of the rotor and stator tooth widths, the PM shape, the rotor tooth shape, and the tooth tips on the PM demagnetization is investigated. The results show that by shaping the PMs or moving the PMs away from the airgap without using tooth tip, the demagnetization problem can be solved without reduction in torque.
{"title":"Analysis and Mitigation of Demagnetization Issue in Stator Slot PM Machines","authors":"H. Qu, Z.Q. Zhu, S. Cai, L. Huang","doi":"10.1049/icp.2021.1015","DOIUrl":"https://doi.org/10.1049/icp.2021.1015","url":null,"abstract":"The Stator slot permanent magnet (PM) machine with PMs placed circumferentially in the slot openings is inherently fault-tolerant under the uncontrolled generator operation since the PM flux is short-circuited within the stator. However, as the PMs are placed in the slot openings and adjacent to the high-permeability iron core, the tangential flux component may cause partial demagnetization of magnets, especially under heavy load condition. In this paper, the influence of the rotor and stator tooth widths, the PM shape, the rotor tooth shape, and the tooth tips on the PM demagnetization is investigated. The results show that by shaping the PMs or moving the PMs away from the airgap without using tooth tip, the demagnetization problem can be solved without reduction in torque.","PeriodicalId":188371,"journal":{"name":"The 10th International Conference on Power Electronics, Machines and Drives (PEMD 2020)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122131499","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}
The insulation of a rotating electrical machine is a complex system. Predicting its lifetime is an extremely challenging task, as it involves elements of chemistry, material science and electrical engineering. This lifetime prediction/assessment, if performed under standard “in-service” operating conditions, can require months (and in some cases years) of testing. Therefore, accelerated lifetime tests, performed on suitable specimens, are conventionally run for fulfilling such task, as they reduce the total testing time. During these tests, the stress level applied to the examined system (i.e. insulation) is enhanced with respect to normal operating conditions, with the aim of reaching the end of life in a relatively short amount of time. It is thus of crucial importance selecting an appropriate specimen's typology, as the choice might strongly influence the tests' outcome. In this work, the accelerated thermal aging results for three different specimens' typologies, i.e. twisted pair, motorette and coil, are presented and apprised. The tests are carried out on a round enamelled magnet wire, to be employed for the winding of low voltage electrical machines. Among the three specimens, it is found that twisted pairs tend to largely over-estimate the thermal lifetime, with respect to both motorettes and coils.
{"title":"On specimens choice for thermal lifetime assessment of low voltage electrical machines insulation","authors":"V. Madonna, P. Giangrande, M. Galea","doi":"10.1049/icp.2021.1127","DOIUrl":"https://doi.org/10.1049/icp.2021.1127","url":null,"abstract":"The insulation of a rotating electrical machine is a complex system. Predicting its lifetime is an extremely challenging task, as it involves elements of chemistry, material science and electrical engineering. This lifetime prediction/assessment, if performed under standard “in-service” operating conditions, can require months (and in some cases years) of testing. Therefore, accelerated lifetime tests, performed on suitable specimens, are conventionally run for fulfilling such task, as they reduce the total testing time. During these tests, the stress level applied to the examined system (i.e. insulation) is enhanced with respect to normal operating conditions, with the aim of reaching the end of life in a relatively short amount of time. It is thus of crucial importance selecting an appropriate specimen's typology, as the choice might strongly influence the tests' outcome. In this work, the accelerated thermal aging results for three different specimens' typologies, i.e. twisted pair, motorette and coil, are presented and apprised. The tests are carried out on a round enamelled magnet wire, to be employed for the winding of low voltage electrical machines. Among the three specimens, it is found that twisted pairs tend to largely over-estimate the thermal lifetime, with respect to both motorettes and coils.","PeriodicalId":188371,"journal":{"name":"The 10th International Conference on Power Electronics, Machines and Drives (PEMD 2020)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129017100","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}
The paradigm shift in the operation of the adjustable speed drives operating under frequent start and stop instead of long continuous operation induces thermo-mechanical stress. This intermittent operation changes the operating temperature of the machine frequently, which results in uneven expansion/contraction of different materials. This difference causes stress which accelerates the ageing of the insulations. So far, the effect of thermal stress on the ageing phenomenon is well-known in the literature. However, the study of ageing process under thermo-mechanical stress is scant. To circumvent the unpredictable downtime due to the stress, continuous monitoring of insulation health is attracting more attention. This work aims to study the effect of thermomechanical stress on insulation by exposing 7 stators of 2.83 kW servomotor to thermal cycles under temperature-controlled environment. The degradation of insulation is continuously observed by measuring the groundwall capacitance. Results show that the capacitance varies along with the temperature, and both its average and the peak-to-peak variation decay with aging. Based on the experimental investigation, a mathematical model representing the ageing phenomenon of the winding insulation is proposed. The proposed model is based on the assumption that the observed changes in the insulation capacitance due to thermal aging are the result of internal chemical reactions which obey the Arrhenius law.
{"title":"Online Monitoring of Ground-wall Insulation Impedance under Cyclic Load Operation","authors":"S. Sundeep, I. Tsyokhla, J. Wang, A. Griffo","doi":"10.1049/icp.2021.1069","DOIUrl":"https://doi.org/10.1049/icp.2021.1069","url":null,"abstract":"The paradigm shift in the operation of the adjustable speed drives operating under frequent start and stop instead of long continuous operation induces thermo-mechanical stress. This intermittent operation changes the operating temperature of the machine frequently, which results in uneven expansion/contraction of different materials. This difference causes stress which accelerates the ageing of the insulations. So far, the effect of thermal stress on the ageing phenomenon is well-known in the literature. However, the study of ageing process under thermo-mechanical stress is scant. To circumvent the unpredictable downtime due to the stress, continuous monitoring of insulation health is attracting more attention. This work aims to study the effect of thermomechanical stress on insulation by exposing 7 stators of 2.83 kW servomotor to thermal cycles under temperature-controlled environment. The degradation of insulation is continuously observed by measuring the groundwall capacitance. Results show that the capacitance varies along with the temperature, and both its average and the peak-to-peak variation decay with aging. Based on the experimental investigation, a mathematical model representing the ageing phenomenon of the winding insulation is proposed. The proposed model is based on the assumption that the observed changes in the insulation capacitance due to thermal aging are the result of internal chemical reactions which obey the Arrhenius law.","PeriodicalId":188371,"journal":{"name":"The 10th International Conference on Power Electronics, Machines and Drives (PEMD 2020)","volume":"84 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129367295","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}
Multi-objective optimization (MOO) in the area of power electric applications requires complete and reliable component models. This contribution presents a simple and standardized method to generate the component models. After a short introduction, the stepwise approach is presented using the example ‘dc-link capacitor’. The problem of reliable component prices at low minimum order quantities (MOQ) is addressed and a concept called ‘linear-price estimation’ is introduced to solve the problem. Results of the models are shown and discussed. It is shown that small errors between training data and the models can be achieved for the cost, size and efficiency models with the approach. Finally, the approach is classified in the research field of MOO and it is briefly outlined that the approach can also be applied to other components (e.g. semiconductors).
{"title":"A GENERALIZED APPROACH TO GENERATE THE COMPONENT MODELS FOR MULTI-OBJECTIVE OPTIMIZATION IN POWER ELECTRONIC APPLICATIONS","authors":"M. Gladen, L. Brakemeier, V. Staudt","doi":"10.1049/icp.2021.0999","DOIUrl":"https://doi.org/10.1049/icp.2021.0999","url":null,"abstract":"Multi-objective optimization (MOO) in the area of power electric applications requires complete and reliable component models. This contribution presents a simple and standardized method to generate the component models. After a short introduction, the stepwise approach is presented using the example ‘dc-link capacitor’. The problem of reliable component prices at low minimum order quantities (MOQ) is addressed and a concept called ‘linear-price estimation’ is introduced to solve the problem. Results of the models are shown and discussed. It is shown that small errors between training data and the models can be achieved for the cost, size and efficiency models with the approach. Finally, the approach is classified in the research field of MOO and it is briefly outlined that the approach can also be applied to other components (e.g. semiconductors).","PeriodicalId":188371,"journal":{"name":"The 10th International Conference on Power Electronics, Machines and Drives (PEMD 2020)","volume":"2020 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129294504","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}
Future generation more electric aircrafts will require significantly larger power do be generated on board and for this reason, being able to identify which high power/medium voltage AC/DC power converter topologies would suit best is important. This paper aims at reviewing the requirements for selecting the best converter topology for the challenge and how this is impacted by the available technologies of SiC switches. A simulation study is carried out with a focus on investigating the capabilities of a selection of converter candidates with power scaling up potential.
{"title":"EVALUATION OF INVERTER TOPOLOGIES FOR HIGH POWER/MEDIUM VOLTAGE AIRCRAFT APPLICATIONS","authors":"C. Klumpner, F. Khera","doi":"10.1049/icp.2021.1132","DOIUrl":"https://doi.org/10.1049/icp.2021.1132","url":null,"abstract":"Future generation more electric aircrafts will require significantly larger power do be generated on board and for this reason, being able to identify which high power/medium voltage AC/DC power converter topologies would suit best is important. This paper aims at reviewing the requirements for selecting the best converter topology for the challenge and how this is impacted by the available technologies of SiC switches. A simulation study is carried out with a focus on investigating the capabilities of a selection of converter candidates with power scaling up potential.","PeriodicalId":188371,"journal":{"name":"The 10th International Conference on Power Electronics, Machines and Drives (PEMD 2020)","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124025223","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}
This paper presents a thermal analysis methodology of a permanent magnet (PM) machine used in an aerospace application. Thermal uncertainties and important thermal parameters due to manufacture and assembly have been exploited by conducting several thermal tests in the machine pre-assembly stages. Steady state DC thermal tests of the stator windings at standstill are crucial to understand the main heat paths in the machine structure. Therefore, thermal data collected from the stator windings and laminations in steady state DC tests are used to calibrate the 3D finite element (FE) thermal model of the machine by employing lumped parameter thermal network (LPTN) and short time thermal transient tests for the windings. It is shown that the thermal experiments in pre-assembly and post-assembly stages are required to obtain a more accurate machine thermal model. Authors report that effective slot thermal conductivity is the principal thermal parameter which needs to be estimated correctly to model an electrical machine thermally and also that off-tooth winding of the machine causes a poor effective slot thermal conductivity. Sensitivity of important thermal parameters on the winding temperature variation is also described by utilising a calibrated 3D FE thermal model of the proposed alternator.
{"title":"A METHODICAL APPROACH TO DETERMINE IMPORTANT THERMAL PARAMETERS OF A PERMANENT MAGNET ALTERNATOR","authors":"M. Kulan, N. Baker, S. Turvey","doi":"10.1049/icp.2021.1068","DOIUrl":"https://doi.org/10.1049/icp.2021.1068","url":null,"abstract":"This paper presents a thermal analysis methodology of a permanent magnet (PM) machine used in an aerospace application. Thermal uncertainties and important thermal parameters due to manufacture and assembly have been exploited by conducting several thermal tests in the machine pre-assembly stages. Steady state DC thermal tests of the stator windings at standstill are crucial to understand the main heat paths in the machine structure. Therefore, thermal data collected from the stator windings and laminations in steady state DC tests are used to calibrate the 3D finite element (FE) thermal model of the machine by employing lumped parameter thermal network (LPTN) and short time thermal transient tests for the windings. It is shown that the thermal experiments in pre-assembly and post-assembly stages are required to obtain a more accurate machine thermal model. Authors report that effective slot thermal conductivity is the principal thermal parameter which needs to be estimated correctly to model an electrical machine thermally and also that off-tooth winding of the machine causes a poor effective slot thermal conductivity. Sensitivity of important thermal parameters on the winding temperature variation is also described by utilising a calibrated 3D FE thermal model of the proposed alternator.","PeriodicalId":188371,"journal":{"name":"The 10th International Conference on Power Electronics, Machines and Drives (PEMD 2020)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121288562","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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