Pub Date : 1997-05-18DOI: 10.1109/IEMDC.1997.604194
O. Mohammed
Genetic algorithms (GAs) have been successfully applied to the design optimization of electromagnetic devices. In this paper, practical issues relating to the implementation the technique are examined. The possibility of a premature convergence in some applications is studied. Recommendations and guidelines to take these practical implementation issues into consideration are explained through application examples.
{"title":"GA optimization in electric machines","authors":"O. Mohammed","doi":"10.1109/IEMDC.1997.604194","DOIUrl":"https://doi.org/10.1109/IEMDC.1997.604194","url":null,"abstract":"Genetic algorithms (GAs) have been successfully applied to the design optimization of electromagnetic devices. In this paper, practical issues relating to the implementation the technique are examined. The possibility of a premature convergence in some applications is studied. Recommendations and guidelines to take these practical implementation issues into consideration are explained through application examples.","PeriodicalId":176640,"journal":{"name":"1997 IEEE International Electric Machines and Drives Conference Record","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123326194","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 : 1997-05-18DOI: 10.1109/IEMDC.1997.604300
L. Reyes Rosales Montero, W. Santos Mota, M.W. Gemerts
A new alternative is proposed in this work. It presents a control and monitoring system for a turbine and synchronous generator. A single processor architecture IBM-PC and a data acquisition board with its signal conditioning circuits are used. Two sensors of electric magnitudes based on microcomputers are implemented: load angle for synchronous machine; and electric frequency. The working principles and experimental results are presented.
{"title":"Monitoring and control system based on microcomputer for synchronous generator","authors":"L. Reyes Rosales Montero, W. Santos Mota, M.W. Gemerts","doi":"10.1109/IEMDC.1997.604300","DOIUrl":"https://doi.org/10.1109/IEMDC.1997.604300","url":null,"abstract":"A new alternative is proposed in this work. It presents a control and monitoring system for a turbine and synchronous generator. A single processor architecture IBM-PC and a data acquisition board with its signal conditioning circuits are used. Two sensors of electric magnitudes based on microcomputers are implemented: load angle for synchronous machine; and electric frequency. The working principles and experimental results are presented.","PeriodicalId":176640,"journal":{"name":"1997 IEEE International Electric Machines and Drives Conference Record","volume":"109 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124035536","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 : 1997-05-18DOI: 10.1109/IEMDC.1997.604339
N. Takahashi
Some new techniques in the analysis and design of electric machines are discussed, namely: the time-periodic analysis of the magnetic field in nonoriented materials, taking into account hysteresis characteristics; 3-D transient analysis of capacitor-discharge impulse magnetizers; and a 3-D optimization method of electric machines considering nonlinearity and eddy currents. The usefulness of these techniques is shown by applying them to actual machines and comparisons with measurement results.
{"title":"Some useful techniques in analysis and design of electric machines","authors":"N. Takahashi","doi":"10.1109/IEMDC.1997.604339","DOIUrl":"https://doi.org/10.1109/IEMDC.1997.604339","url":null,"abstract":"Some new techniques in the analysis and design of electric machines are discussed, namely: the time-periodic analysis of the magnetic field in nonoriented materials, taking into account hysteresis characteristics; 3-D transient analysis of capacitor-discharge impulse magnetizers; and a 3-D optimization method of electric machines considering nonlinearity and eddy currents. The usefulness of these techniques is shown by applying them to actual machines and comparisons with measurement results.","PeriodicalId":176640,"journal":{"name":"1997 IEEE International Electric Machines and Drives Conference Record","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124190634","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 : 1997-05-18DOI: 10.1109/IEMDC.1997.604262
H. Yamashita, V. Cingoski, E. Nakamae, A. Namera, H. Kitamura
This paper deals with design improvements on the graded insulation of power transformers using transient electric field analysis and a visualization technique. The calculation method for transient electric field analysis inside a power transformer impressed with an impulse voltage is presented. Initially, the concentrated electric network for the power transformer is constructed by dividing the transformer windings into several blocks and by computing the electric circuit parameters. Next, a transient electric field analysis is performed. Using the results of the circuit analysis as boundary conditions, a 2-D axisymmetrical electric field finite element analysis is performed. Finally, an animated display technique for the transient voltage, the electric field intensity and the tolerance rate of electric field intensity distributions is proposed as an extremely useful tool for design on graded insulation. A successful application of the proposed method for analysis of a model transformer for which the computed results agree very well with measured results is also presented.
{"title":"Design improvements on graded insulation of power transformers using transient electric field analysis and visualization technique","authors":"H. Yamashita, V. Cingoski, E. Nakamae, A. Namera, H. Kitamura","doi":"10.1109/IEMDC.1997.604262","DOIUrl":"https://doi.org/10.1109/IEMDC.1997.604262","url":null,"abstract":"This paper deals with design improvements on the graded insulation of power transformers using transient electric field analysis and a visualization technique. The calculation method for transient electric field analysis inside a power transformer impressed with an impulse voltage is presented. Initially, the concentrated electric network for the power transformer is constructed by dividing the transformer windings into several blocks and by computing the electric circuit parameters. Next, a transient electric field analysis is performed. Using the results of the circuit analysis as boundary conditions, a 2-D axisymmetrical electric field finite element analysis is performed. Finally, an animated display technique for the transient voltage, the electric field intensity and the tolerance rate of electric field intensity distributions is proposed as an extremely useful tool for design on graded insulation. A successful application of the proposed method for analysis of a model transformer for which the computed results agree very well with measured results is also presented.","PeriodicalId":176640,"journal":{"name":"1997 IEEE International Electric Machines and Drives Conference Record","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123958321","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 : 1997-05-18DOI: 10.1109/IEMDC.1997.604253
Y. Kats
A new theory for multiphase motors which takes into account current harmonics and all space harmonics of the magnetomotive force (MMF) is presented. It is shown that a multiphase motor for an adjustable speed drive (ASD) should have a full pitch or nearly full pitch winding with nearly rectangular space distribution of the phase MMF. The results can be used in the design of ASDs with induction, synchronous and permanent magnet motors.
{"title":"Adjustable-speed drives with multiphase motors","authors":"Y. Kats","doi":"10.1109/IEMDC.1997.604253","DOIUrl":"https://doi.org/10.1109/IEMDC.1997.604253","url":null,"abstract":"A new theory for multiphase motors which takes into account current harmonics and all space harmonics of the magnetomotive force (MMF) is presented. It is shown that a multiphase motor for an adjustable speed drive (ASD) should have a full pitch or nearly full pitch winding with nearly rectangular space distribution of the phase MMF. The results can be used in the design of ASDs with induction, synchronous and permanent magnet motors.","PeriodicalId":176640,"journal":{"name":"1997 IEEE International Electric Machines and Drives Conference Record","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128450510","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 : 1997-05-18DOI: 10.1109/IEMDC.1997.604226
J. Sakellaris, J. Xypteras, T. Tsiboukis
It is very important to efficiently design induction motors from the thermal point of view. For this task it is crucial to compute correctly the induced currents in the rotors, because heating is principally generated there. The currents flowing in the coils of the stator are another source of heating. This paper presents a weak coupled model of the electromagnetic and the thermal phenomena for transients. Special attention is paid to model correctly the air gap zone for the thermal part.
{"title":"A coupled magnetic thermal model for transients of asynchronous machines","authors":"J. Sakellaris, J. Xypteras, T. Tsiboukis","doi":"10.1109/IEMDC.1997.604226","DOIUrl":"https://doi.org/10.1109/IEMDC.1997.604226","url":null,"abstract":"It is very important to efficiently design induction motors from the thermal point of view. For this task it is crucial to compute correctly the induced currents in the rotors, because heating is principally generated there. The currents flowing in the coils of the stator are another source of heating. This paper presents a weak coupled model of the electromagnetic and the thermal phenomena for transients. Special attention is paid to model correctly the air gap zone for the thermal part.","PeriodicalId":176640,"journal":{"name":"1997 IEEE International Electric Machines and Drives Conference Record","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129398247","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 : 1997-05-18DOI: 10.1109/IEMDC.1997.604086
T. Chan
This paper analyzes the performance of a three-phase induction generator which is connected to a single-phase power system. Significant improvement in machine performance can be obtained by using a static phase-converter, provided that the machine is driven in the reverse direction. The theoretical analysis a validated by experiments on a 2 kW test machine.
{"title":"Effect of rotational direction on the performance of a three-phase induction generator connected to a single-phase power system","authors":"T. Chan","doi":"10.1109/IEMDC.1997.604086","DOIUrl":"https://doi.org/10.1109/IEMDC.1997.604086","url":null,"abstract":"This paper analyzes the performance of a three-phase induction generator which is connected to a single-phase power system. Significant improvement in machine performance can be obtained by using a static phase-converter, provided that the machine is driven in the reverse direction. The theoretical analysis a validated by experiments on a 2 kW test machine.","PeriodicalId":176640,"journal":{"name":"1997 IEEE International Electric Machines and Drives Conference Record","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131214957","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 : 1997-05-18DOI: 10.1109/IEMDC.1997.604230
J. Seok, S. Sul
This paper presents the optimal flux selection of an induction machine for torque maximization over the entire flux weakening region. Based on the bounded constraints on both current and voltage, the optimal flux values which maximize the torque are obtained by solving first-order differential equation of the rotor flux. This leads naturally to three regions of operation in which the induction machine is at either the current constraint, the voltage constraint, or at both simultaneously. The optimal onset of these regions is automatically adjusted to achieve the full utilization of the torque capability. These results provide the significant increase in the available torque compared with any other conventional methods.
{"title":"Optimal flux selection of an induction machine for torque maximization","authors":"J. Seok, S. Sul","doi":"10.1109/IEMDC.1997.604230","DOIUrl":"https://doi.org/10.1109/IEMDC.1997.604230","url":null,"abstract":"This paper presents the optimal flux selection of an induction machine for torque maximization over the entire flux weakening region. Based on the bounded constraints on both current and voltage, the optimal flux values which maximize the torque are obtained by solving first-order differential equation of the rotor flux. This leads naturally to three regions of operation in which the induction machine is at either the current constraint, the voltage constraint, or at both simultaneously. The optimal onset of these regions is automatically adjusted to achieve the full utilization of the torque capability. These results provide the significant increase in the available torque compared with any other conventional methods.","PeriodicalId":176640,"journal":{"name":"1997 IEEE International Electric Machines and Drives Conference Record","volume":"176 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129797320","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 : 1997-05-18DOI: 10.1109/IEMDC.1997.604233
R. Beguenane, M. El Hachemi Benbouzid, M. Tadjine, Abdelhamid Tayebi
This paper deals with simultaneous estimation of induction motor speed and its inverse rotor time constant for sensorless induction machine drive purposes. The proposed algorithm is based on the model reference adaptive system theory (MRAS). The simulation results seem to be very satisfactory for a large wide of supply frequency and torque load.
{"title":"Speed and rotor time constant estimation via MRAS strategy for induction motor drives","authors":"R. Beguenane, M. El Hachemi Benbouzid, M. Tadjine, Abdelhamid Tayebi","doi":"10.1109/IEMDC.1997.604233","DOIUrl":"https://doi.org/10.1109/IEMDC.1997.604233","url":null,"abstract":"This paper deals with simultaneous estimation of induction motor speed and its inverse rotor time constant for sensorless induction machine drive purposes. The proposed algorithm is based on the model reference adaptive system theory (MRAS). The simulation results seem to be very satisfactory for a large wide of supply frequency and torque load.","PeriodicalId":176640,"journal":{"name":"1997 IEEE International Electric Machines and Drives Conference Record","volume":"67 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129625566","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 : 1997-05-18DOI: 10.1109/IEMDC.1997.604099
G.A. Simone, R.C. Creppe, C. R. Souza
An application of the linear machine one-dimensional analysis method to the modeling of a conventional asynchronous induction motor, considered as a particular case of linear and sectorial machines, is described. A mathematical model for the calculation of the propulsive force developed by this motor, taking into account the transversal edge effect, is derived from the application of the one-dimensional theory and presented in this paper. As an application example, an induction motor is analyzed by means of the one-dimensional theory.
{"title":"The asynchronous motor one-dimensional analysis","authors":"G.A. Simone, R.C. Creppe, C. R. Souza","doi":"10.1109/IEMDC.1997.604099","DOIUrl":"https://doi.org/10.1109/IEMDC.1997.604099","url":null,"abstract":"An application of the linear machine one-dimensional analysis method to the modeling of a conventional asynchronous induction motor, considered as a particular case of linear and sectorial machines, is described. A mathematical model for the calculation of the propulsive force developed by this motor, taking into account the transversal edge effect, is derived from the application of the one-dimensional theory and presented in this paper. As an application example, an induction motor is analyzed by means of the one-dimensional theory.","PeriodicalId":176640,"journal":{"name":"1997 IEEE International Electric Machines and Drives Conference Record","volume":"240 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126046408","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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