Pub Date : 2010-05-09DOI: 10.1109/CEFC.2010.5481334
N. Paudel, Jonathan Z. Bird
When a rotor is simultaneously rotated and translationally moved above an aluminum guideway a traveling time-varying magnetic field is created in the air-gap. This field induces eddy currents in the guideway that can simultaneously create suspension and propulsion or breaking forces. The field and forces created by this moving rotor are modeled using a novel 2D analytic based A-⌽ method in which the rotor field is incorporated into the boundary conditions of the guideway. The model accuracy is verified using finite element analysis.
{"title":"A 2D analytic based model of a rotor moving over a conductive guideway","authors":"N. Paudel, Jonathan Z. Bird","doi":"10.1109/CEFC.2010.5481334","DOIUrl":"https://doi.org/10.1109/CEFC.2010.5481334","url":null,"abstract":"When a rotor is simultaneously rotated and translationally moved above an aluminum guideway a traveling time-varying magnetic field is created in the air-gap. This field induces eddy currents in the guideway that can simultaneously create suspension and propulsion or breaking forces. The field and forces created by this moving rotor are modeled using a novel 2D analytic based A-⌽ method in which the rotor field is incorporated into the boundary conditions of the guideway. The model accuracy is verified using finite element analysis.","PeriodicalId":148739,"journal":{"name":"Digests of the 2010 14th Biennial IEEE Conference on Electromagnetic Field Computation","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133553814","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 : 2010-05-09DOI: 10.1109/CEFC.2010.5481654
Y. Zhan, A. Knight
This paper investigates the performances of different evolution strategies applied to slot shape optimization for a permanent magnet synchronous machine. (1,2), (1, 3) and (1,4) evolution strategies are implemented with different values of learning rate to compare their convergence and reliability.
{"title":"Investigation on the evolution strategies for slot shape optimization of a permanent magnet synchronous machine","authors":"Y. Zhan, A. Knight","doi":"10.1109/CEFC.2010.5481654","DOIUrl":"https://doi.org/10.1109/CEFC.2010.5481654","url":null,"abstract":"This paper investigates the performances of different evolution strategies applied to slot shape optimization for a permanent magnet synchronous machine. (1,2), (1, 3) and (1,4) evolution strategies are implemented with different values of learning rate to compare their convergence and reliability.","PeriodicalId":148739,"journal":{"name":"Digests of the 2010 14th Biennial IEEE Conference on Electromagnetic Field Computation","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131794677","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 : 2010-05-09DOI: 10.1109/CEFC.2010.5481605
D. Kowal, L. Dupré, P. Sergeant, L. Vandenbossche, M. De Wulf
The performance of a variable speed, direct-drive synchronous generator wind turbine concept is compared for two grades of electric steel applied for the generator stator core lamination. A ring type, radial flux permanent magnet synchronous generator (PMSG) is modelled. For a fixed mechanical power input, the geometry of the PMSG is optimized for each material to maximize the annual energy yield. The energy yield is calculated based on the power curve of the generator and the probability density function of the wind speed. This function is approximated by the Weibull distribution for a site with average wind speed of 7 m/s. The annual efficiency differs more than 2% between the two optimized generators, which use different grades of material.
{"title":"Influence of the electrical steel grade on the performance of the direct-drive permanent magnet machine for wind energy generation","authors":"D. Kowal, L. Dupré, P. Sergeant, L. Vandenbossche, M. De Wulf","doi":"10.1109/CEFC.2010.5481605","DOIUrl":"https://doi.org/10.1109/CEFC.2010.5481605","url":null,"abstract":"The performance of a variable speed, direct-drive synchronous generator wind turbine concept is compared for two grades of electric steel applied for the generator stator core lamination. A ring type, radial flux permanent magnet synchronous generator (PMSG) is modelled. For a fixed mechanical power input, the geometry of the PMSG is optimized for each material to maximize the annual energy yield. The energy yield is calculated based on the power curve of the generator and the probability density function of the wind speed. This function is approximated by the Weibull distribution for a site with average wind speed of 7 m/s. The annual efficiency differs more than 2% between the two optimized generators, which use different grades of material.","PeriodicalId":148739,"journal":{"name":"Digests of the 2010 14th Biennial IEEE Conference on Electromagnetic Field Computation","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133219723","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 : 2010-05-09DOI: 10.1109/CEFC.2010.5481077
Minho Song, Minh-Trien Pham, Heesung Yoon, C. Koh
A new numerically efficient global optimization algorithm utilizing grid computing technique and surrogate objective function (SOF) is developed. The algorithm combines particles swarm optimization (PSO) with a SOF constructed by using Multi-quadric radial basis function. For the computation of the objective function values for sampling points, grid computing technique is adopted employing the same number of personal computers connected to Internet with that of the sampling points.
{"title":"Utilizing grid computing technique for numerically efficient global optimization of electromagnetic devices","authors":"Minho Song, Minh-Trien Pham, Heesung Yoon, C. Koh","doi":"10.1109/CEFC.2010.5481077","DOIUrl":"https://doi.org/10.1109/CEFC.2010.5481077","url":null,"abstract":"A new numerically efficient global optimization algorithm utilizing grid computing technique and surrogate objective function (SOF) is developed. The algorithm combines particles swarm optimization (PSO) with a SOF constructed by using Multi-quadric radial basis function. For the computation of the objective function values for sampling points, grid computing technique is adopted employing the same number of personal computers connected to Internet with that of the sampling points.","PeriodicalId":148739,"journal":{"name":"Digests of the 2010 14th Biennial IEEE Conference on Electromagnetic Field Computation","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133591601","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 : 2010-05-09DOI: 10.1109/CEFC.2010.5481740
K. Woo, Sang-hoon Park, H. Park
In this paper, torque characteristics analysis of synchronous reluctance motor by winding function theory is described. The stator is same as one of the induction motor but rotor have two differential geometries of the flux barrier to reduce the torque ripple. The flux barriers were designed by optimization algorism considering torque ripple. Inductances for the separate part of the rotor were calculated by using the winding function theory. Stator currents and torque were obtained by means of the magnetic circuits. From the comparison with results of finite element analysis the proposed method was verified.
{"title":"Torque characteristics analysis of synchronous reluctance motor based on winding function theory","authors":"K. Woo, Sang-hoon Park, H. Park","doi":"10.1109/CEFC.2010.5481740","DOIUrl":"https://doi.org/10.1109/CEFC.2010.5481740","url":null,"abstract":"In this paper, torque characteristics analysis of synchronous reluctance motor by winding function theory is described. The stator is same as one of the induction motor but rotor have two differential geometries of the flux barrier to reduce the torque ripple. The flux barriers were designed by optimization algorism considering torque ripple. Inductances for the separate part of the rotor were calculated by using the winding function theory. Stator currents and torque were obtained by means of the magnetic circuits. From the comparison with results of finite element analysis the proposed method was verified.","PeriodicalId":148739,"journal":{"name":"Digests of the 2010 14th Biennial IEEE Conference on Electromagnetic Field Computation","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132729935","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 : 2010-05-09DOI: 10.1109/CEFC.2010.5481421
A. Tinzefte, M. Aubertin, T. Henneron, F. Piriou
In this paper, an adapted preconditioner and Conjugate Gradient (CG) are presented for the matrix system obtained from the Mortar method applied to the potential formulations. As example of application a magnetostatic problem is studied to validate the reduction of the iterations number for the preconditioned iterative method.
{"title":"Preconditioner for Mortar method applied to the FEM","authors":"A. Tinzefte, M. Aubertin, T. Henneron, F. Piriou","doi":"10.1109/CEFC.2010.5481421","DOIUrl":"https://doi.org/10.1109/CEFC.2010.5481421","url":null,"abstract":"In this paper, an adapted preconditioner and Conjugate Gradient (CG) are presented for the matrix system obtained from the Mortar method applied to the potential formulations. As example of application a magnetostatic problem is studied to validate the reduction of the iterations number for the preconditioned iterative method.","PeriodicalId":148739,"journal":{"name":"Digests of the 2010 14th Biennial IEEE Conference on Electromagnetic Field Computation","volume":"132 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133000031","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 : 2010-05-09DOI: 10.1109/CEFC.2010.5481677
Hee-Woon Kim, Jin-Gyu Youn, J. Hur, Byeong-Woo Kim
This paper presents that torque characteristic according to the pole/slot combination is analyzed under a stator-turn fault. The circulating current affects increasing input current and aggravating torque characteristic under a stator-fault. This paper is made of the modeling of 8-pole 12-slot and 10-pole 12-slot motors using the developed FEM-base model and analyzed the torque characteristic according to the circulating current and input current under a stator-turn fault.
{"title":"Torque characteristic analysis of IPM type BLDC motor considering pole/slot combination under stator-turn fault condition","authors":"Hee-Woon Kim, Jin-Gyu Youn, J. Hur, Byeong-Woo Kim","doi":"10.1109/CEFC.2010.5481677","DOIUrl":"https://doi.org/10.1109/CEFC.2010.5481677","url":null,"abstract":"This paper presents that torque characteristic according to the pole/slot combination is analyzed under a stator-turn fault. The circulating current affects increasing input current and aggravating torque characteristic under a stator-fault. This paper is made of the modeling of 8-pole 12-slot and 10-pole 12-slot motors using the developed FEM-base model and analyzed the torque characteristic according to the circulating current and input current under a stator-turn fault.","PeriodicalId":148739,"journal":{"name":"Digests of the 2010 14th Biennial IEEE Conference on Electromagnetic Field Computation","volume":" 8","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114053233","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 : 2010-05-09DOI: 10.1109/CEFC.2010.5481731
Kwangsoo Kim, Seung Joo Kim, Won-Ho kim, Jong-Bin Im, Suyeon Cho, Ju Lee
This paper presents the optimal design method of cage-bars in a single-phase line-start permanent magnet synchronous motor. This method consists of two procedures. First, the basic design of cage-bars is made by analytic method of an induction motor. But, this method cannot consider nonlinear characteristic as magnetic saturation and leakage flux. Therefore, at second step, for considering the nonlinear characteristics, the optimal design of cage-bars is performed by the response surface method (RSM) and Pattern Search Algorithm (PSA).
{"title":"The optimal design of the rotor bar for LSPMSM considering the starting torque and magnetic saturation","authors":"Kwangsoo Kim, Seung Joo Kim, Won-Ho kim, Jong-Bin Im, Suyeon Cho, Ju Lee","doi":"10.1109/CEFC.2010.5481731","DOIUrl":"https://doi.org/10.1109/CEFC.2010.5481731","url":null,"abstract":"This paper presents the optimal design method of cage-bars in a single-phase line-start permanent magnet synchronous motor. This method consists of two procedures. First, the basic design of cage-bars is made by analytic method of an induction motor. But, this method cannot consider nonlinear characteristic as magnetic saturation and leakage flux. Therefore, at second step, for considering the nonlinear characteristics, the optimal design of cage-bars is performed by the response surface method (RSM) and Pattern Search Algorithm (PSA).","PeriodicalId":148739,"journal":{"name":"Digests of the 2010 14th Biennial IEEE Conference on Electromagnetic Field Computation","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122021190","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 : 2010-05-09DOI: 10.1109/CEFC.2010.5481489
C. Antunes, T. Almeida, N. Raposeiro, B. Gonçalves, Paulo Almeida
In the last decade, the study of methodologies for heating biological tissue has been an area of most interest in biology and medicine. As a result, the number of electrode solutions has grown in the past years. In this work, we study the capability of using a tubular electrode for heating biological tissue. To test this possibility, liver samples ex-vivo were used and numerical simulations were made. The final results were compared and revealed satisfactory and promising use of tubular electrodes for this kind of application.
{"title":"Thermal ablation in biological tissue using tubular electrode","authors":"C. Antunes, T. Almeida, N. Raposeiro, B. Gonçalves, Paulo Almeida","doi":"10.1109/CEFC.2010.5481489","DOIUrl":"https://doi.org/10.1109/CEFC.2010.5481489","url":null,"abstract":"In the last decade, the study of methodologies for heating biological tissue has been an area of most interest in biology and medicine. As a result, the number of electrode solutions has grown in the past years. In this work, we study the capability of using a tubular electrode for heating biological tissue. To test this possibility, liver samples ex-vivo were used and numerical simulations were made. The final results were compared and revealed satisfactory and promising use of tubular electrodes for this kind of application.","PeriodicalId":148739,"journal":{"name":"Digests of the 2010 14th Biennial IEEE Conference on Electromagnetic Field Computation","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116106571","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 : 2010-05-09DOI: 10.1109/CEFC.2010.5481809
Li Liyi, Pan Donghua, Kou Baoquan
Eddy currents induced in a conductor in a changing magnetic field produce a damping force proportional to the heat generated in the conductive material. In the DC linear motor system, the conductive plate is added under coils for damping force to improve motor's dynamic response. In the preliminary work, the formula of magnetic field distribution is obtained by the method of images, so the eddy current inducted in the conductor is calculated. Then the damping force is obtained after the equivalent resistance and inductance of conductance place are calculated. The design of eddy current damping for short-stroke DC linear motor is optimized by the formula of damping force, and obtains the speed of mover when maximal damping force is induced.
{"title":"Analysis of eddy current damping for short-stroke DC linear motor","authors":"Li Liyi, Pan Donghua, Kou Baoquan","doi":"10.1109/CEFC.2010.5481809","DOIUrl":"https://doi.org/10.1109/CEFC.2010.5481809","url":null,"abstract":"Eddy currents induced in a conductor in a changing magnetic field produce a damping force proportional to the heat generated in the conductive material. In the DC linear motor system, the conductive plate is added under coils for damping force to improve motor's dynamic response. In the preliminary work, the formula of magnetic field distribution is obtained by the method of images, so the eddy current inducted in the conductor is calculated. Then the damping force is obtained after the equivalent resistance and inductance of conductance place are calculated. The design of eddy current damping for short-stroke DC linear motor is optimized by the formula of damping force, and obtains the speed of mover when maximal damping force is induced.","PeriodicalId":148739,"journal":{"name":"Digests of the 2010 14th Biennial IEEE Conference on Electromagnetic Field Computation","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115677182","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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