Pub Date : 2014-07-10DOI: 10.1109/OPTIM.2014.6851037
J. B. Dumitru, A. Morega, M. Morega
This paper presents mathematical modeling and numerical simulation results for a notional miniature power electrical transformer (MPST) with planar, spiral coils, fabricated in micro-electromechanical MEMS technology. The magnetic core of the MPST is partially made of custom-tailored magnetic nanofluid. The electrical circuit lumped parameters are computed from numerical simulation results based on 2D and 3D models. Finally, the magnetization body forces occurring in the fluid core are computed and the 3D motion that they produce is evidenced to be very slow.
{"title":"Nanofluid cored miniature electrical transformer with planar spiral windings","authors":"J. B. Dumitru, A. Morega, M. Morega","doi":"10.1109/OPTIM.2014.6851037","DOIUrl":"https://doi.org/10.1109/OPTIM.2014.6851037","url":null,"abstract":"This paper presents mathematical modeling and numerical simulation results for a notional miniature power electrical transformer (MPST) with planar, spiral coils, fabricated in micro-electromechanical MEMS technology. The magnetic core of the MPST is partially made of custom-tailored magnetic nanofluid. The electrical circuit lumped parameters are computed from numerical simulation results based on 2D and 3D models. Finally, the magnetization body forces occurring in the fluid core are computed and the 3D motion that they produce is evidenced to be very slow.","PeriodicalId":298237,"journal":{"name":"2014 International Conference on Optimization of Electrical and Electronic Equipment (OPTIM)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129732799","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 : 2014-07-10DOI: 10.1109/OPTIM.2014.6850943
G. Madescu, M. Greconici, M. Biriescu, M. Mot
This paper investigates the steady-state symmetrical conditions in capacitor-run two-phase induction motors. Assuming symmetrical conditions in a permanent-split capacitor motor, some relations of power factor, copper losses, starting current, capacitance are derived in order to predict the optimal value of k-ratio between effective turns of auxiliary to main winding. Some conclusions are formulated about the rated values of the voltage and capacitance of the capacitor.
{"title":"Two-phase capacitor motor analysis in steady-state symmetrical conditions","authors":"G. Madescu, M. Greconici, M. Biriescu, M. Mot","doi":"10.1109/OPTIM.2014.6850943","DOIUrl":"https://doi.org/10.1109/OPTIM.2014.6850943","url":null,"abstract":"This paper investigates the steady-state symmetrical conditions in capacitor-run two-phase induction motors. Assuming symmetrical conditions in a permanent-split capacitor motor, some relations of power factor, copper losses, starting current, capacitance are derived in order to predict the optimal value of k-ratio between effective turns of auxiliary to main winding. Some conclusions are formulated about the rated values of the voltage and capacitance of the capacitor.","PeriodicalId":298237,"journal":{"name":"2014 International Conference on Optimization of Electrical and Electronic Equipment (OPTIM)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121074604","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 : 2014-05-22DOI: 10.1109/OPTIM.2014.6850935
G. P. Serb, I. P. Serb
The present study aims to accomplish a theoretical synthesis upon the method to calculate the operational parameters of a railway traction synchronous generator, to propose an algorithm and also to implement it into a numeric program which should be easy to use. It could be used by students, engineers, researchers or others interested in developing custom engineering system modelling. In order to assure a continuity of the authors' research regarding the modelling of the functional and designing aspects of the synchronous machine, it is desirable the choice of Matlab as a programming medium and the accomplishment of a graphic interface which should allow a permanent dialogue between user and the programming resources. This paper is a next step to put the bases of a PBL (Project Based Learning) method in the area of studying electrical machines. The necessary data for the solution to this problem are: the available power of the heat engine during a rated regime of load, the engine speed at the drive shaft of the heat engine, the maximum voltage which is necessary for supplying the asynchronous traction motors at a maximum speed, meaning at the traffic speed of a locomotive. For a systemic and transdisciplinary approach of the research, which should allow it to be the initial point for many and various research objectives, this work starts from the description of the working environment and the interactions of the traction synchronous generator as a component of the diesel electrical transmission. The originality of this work consists in a proposal of a method of calculus which could be used in modern educational languages or in research activity.
{"title":"Method to calculate the operational parameters of a synchronous generator used in a railway diesel electrical traction","authors":"G. P. Serb, I. P. Serb","doi":"10.1109/OPTIM.2014.6850935","DOIUrl":"https://doi.org/10.1109/OPTIM.2014.6850935","url":null,"abstract":"The present study aims to accomplish a theoretical synthesis upon the method to calculate the operational parameters of a railway traction synchronous generator, to propose an algorithm and also to implement it into a numeric program which should be easy to use. It could be used by students, engineers, researchers or others interested in developing custom engineering system modelling. In order to assure a continuity of the authors' research regarding the modelling of the functional and designing aspects of the synchronous machine, it is desirable the choice of Matlab as a programming medium and the accomplishment of a graphic interface which should allow a permanent dialogue between user and the programming resources. This paper is a next step to put the bases of a PBL (Project Based Learning) method in the area of studying electrical machines. The necessary data for the solution to this problem are: the available power of the heat engine during a rated regime of load, the engine speed at the drive shaft of the heat engine, the maximum voltage which is necessary for supplying the asynchronous traction motors at a maximum speed, meaning at the traffic speed of a locomotive. For a systemic and transdisciplinary approach of the research, which should allow it to be the initial point for many and various research objectives, this work starts from the description of the working environment and the interactions of the traction synchronous generator as a component of the diesel electrical transmission. The originality of this work consists in a proposal of a method of calculus which could be used in modern educational languages or in research activity.","PeriodicalId":298237,"journal":{"name":"2014 International Conference on Optimization of Electrical and Electronic Equipment (OPTIM)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125886077","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 : 2014-05-22DOI: 10.1109/OPTIM.2014.6850951
G. Messager, A. Binder
A Bearingless high speed drive force generation is based on the superposition of two fields of different pole pairs differing by ± 1. This paper presents a comparison of electromagnetic properties between the conventional double distributed winding topology of bearingless motors with a non-conventional design, relevant for two pole bearingless drives. It will focus especially on the design equations, on the optimisation and its specific properties.
{"title":"Analytical comparison of conventional and modified winding for high speed bearingless permanent magnet synchronous motor applications","authors":"G. Messager, A. Binder","doi":"10.1109/OPTIM.2014.6850951","DOIUrl":"https://doi.org/10.1109/OPTIM.2014.6850951","url":null,"abstract":"A Bearingless high speed drive force generation is based on the superposition of two fields of different pole pairs differing by ± 1. This paper presents a comparison of electromagnetic properties between the conventional double distributed winding topology of bearingless motors with a non-conventional design, relevant for two pole bearingless drives. It will focus especially on the design equations, on the optimisation and its specific properties.","PeriodicalId":298237,"journal":{"name":"2014 International Conference on Optimization of Electrical and Electronic Equipment (OPTIM)","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125898557","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 : 2014-05-22DOI: 10.1109/OPTIM.2014.6851018
A. Bajenaru, C. Boianceanu, G. Brezeanu
This paper presents a method to characterize the electro-thermal behavior of power NPN transistors in the presence of temperature gradients that mimic the functioning conditions of the device in circuits like linear voltage regulators. A test structure able to generate the temperature variations over the power device and a measurement setup are presented. The entire structure is then modeled in a 3D thermal simulator and used to recreate the measurement conditions and explain the measured temperature profiles.
{"title":"Electro-thermal characterization of multi-emitter power NPN transistors","authors":"A. Bajenaru, C. Boianceanu, G. Brezeanu","doi":"10.1109/OPTIM.2014.6851018","DOIUrl":"https://doi.org/10.1109/OPTIM.2014.6851018","url":null,"abstract":"This paper presents a method to characterize the electro-thermal behavior of power NPN transistors in the presence of temperature gradients that mimic the functioning conditions of the device in circuits like linear voltage regulators. A test structure able to generate the temperature variations over the power device and a measurement setup are presented. The entire structure is then modeled in a 3D thermal simulator and used to recreate the measurement conditions and explain the measured temperature profiles.","PeriodicalId":298237,"journal":{"name":"2014 International Conference on Optimization of Electrical and Electronic Equipment (OPTIM)","volume":"22 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115585987","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 : 2014-05-22DOI: 10.1109/OPTIM.2014.6851030
M. Chirca, S. Breban, C. Oprea, M. Radulescu
This paper proposes an innovative topology for double-sided inner-stator axial-flux permanent-magnet (AFPM) machine for use as direct-driven generator with low-speed micro-wind turbines. The design evaluation of the new AFPM wind generator, based on 3-D finite-element field analysis, proves that the ironless stator with non-overlapping concentrated winding, sandwiched between two opposing steel-rotor disks with embedded circumferentially-magnetized PMs in flux-concentration arrangement, represents a good-performance and cost-effective double-sided structure for the AFPM machine of choice in micro-wind power generation applications.
{"title":"Design analysis of a novel double-sided axial-flux permanent-magnet generator for micro-wind power applications","authors":"M. Chirca, S. Breban, C. Oprea, M. Radulescu","doi":"10.1109/OPTIM.2014.6851030","DOIUrl":"https://doi.org/10.1109/OPTIM.2014.6851030","url":null,"abstract":"This paper proposes an innovative topology for double-sided inner-stator axial-flux permanent-magnet (AFPM) machine for use as direct-driven generator with low-speed micro-wind turbines. The design evaluation of the new AFPM wind generator, based on 3-D finite-element field analysis, proves that the ironless stator with non-overlapping concentrated winding, sandwiched between two opposing steel-rotor disks with embedded circumferentially-magnetized PMs in flux-concentration arrangement, represents a good-performance and cost-effective double-sided structure for the AFPM machine of choice in micro-wind power generation applications.","PeriodicalId":298237,"journal":{"name":"2014 International Conference on Optimization of Electrical and Electronic Equipment (OPTIM)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116560564","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 : 2014-05-22DOI: 10.1109/OPTIM.2014.6850963
P. Abba, S. Djepang, S. Laminsi, J. Brisset, E. Hnatiuc, B. Hnatiuc
The treatment of industrial waste waters in many developing countries is very limited or even ignored although noticeable efforts of the authorities. The governments look for new efficient and cheap cleaning technologies and the electric techniques are quite able to fulfil the requirements. A good example is provided by a North-Cameroonian tannery factory. In an exploratory set of experiments, the aqueous effluents are exposed to a gliding arc discharge burning in humid air which favors the formation of Reactive Oxygen and Nitrogen Species (RONS), such as °OH and °NO whose derivatives present strong oxidizing character. The batch treatment of the effluents for 10 min induce abatements of Total Organic Carbon, Biological Oxygen Demand and Bacterial population by 30%, 20% and 3 and 4 logarithm units of Colony Forming Units respectively.
{"title":"Pollution abatement of tannery workshop effluents","authors":"P. Abba, S. Djepang, S. Laminsi, J. Brisset, E. Hnatiuc, B. Hnatiuc","doi":"10.1109/OPTIM.2014.6850963","DOIUrl":"https://doi.org/10.1109/OPTIM.2014.6850963","url":null,"abstract":"The treatment of industrial waste waters in many developing countries is very limited or even ignored although noticeable efforts of the authorities. The governments look for new efficient and cheap cleaning technologies and the electric techniques are quite able to fulfil the requirements. A good example is provided by a North-Cameroonian tannery factory. In an exploratory set of experiments, the aqueous effluents are exposed to a gliding arc discharge burning in humid air which favors the formation of Reactive Oxygen and Nitrogen Species (RONS), such as °OH and °NO whose derivatives present strong oxidizing character. The batch treatment of the effluents for 10 min induce abatements of Total Organic Carbon, Biological Oxygen Demand and Bacterial population by 30%, 20% and 3 and 4 logarithm units of Colony Forming Units respectively.","PeriodicalId":298237,"journal":{"name":"2014 International Conference on Optimization of Electrical and Electronic Equipment (OPTIM)","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122858413","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 : 2014-05-22DOI: 10.1109/OPTIM.2014.6850890
D. Draghici, M. Gurbina, A. Ciresan, D. Lascu
The paper investigates predictive digital average current control (PDACC) in dc/dc converters using leading-edge modulation (LEM). The study is focused on the recurrence duty cycle equation and then, based on it, stability analysis is performed. It is demonstrated that average current control using leading-edge modulation is stable on the whole range of the duty cycle and thus design problems are highly simplified. The analysis is carried out in a general manner, independent of converter topology and therefore the results can be easily applied for a certain converter topology (buck, boost, buck-boost, etc.). The theoretical considerations are verified using both MATLAB and finally with the CASPOC circuit simulation package. Some simulation aspects regarding the new developed dedicated blocks are also presented.
{"title":"Predictive leading-edge modulation average current control in DC-DC converters","authors":"D. Draghici, M. Gurbina, A. Ciresan, D. Lascu","doi":"10.1109/OPTIM.2014.6850890","DOIUrl":"https://doi.org/10.1109/OPTIM.2014.6850890","url":null,"abstract":"The paper investigates predictive digital average current control (PDACC) in dc/dc converters using leading-edge modulation (LEM). The study is focused on the recurrence duty cycle equation and then, based on it, stability analysis is performed. It is demonstrated that average current control using leading-edge modulation is stable on the whole range of the duty cycle and thus design problems are highly simplified. The analysis is carried out in a general manner, independent of converter topology and therefore the results can be easily applied for a certain converter topology (buck, boost, buck-boost, etc.). The theoretical considerations are verified using both MATLAB and finally with the CASPOC circuit simulation package. Some simulation aspects regarding the new developed dedicated blocks are also presented.","PeriodicalId":298237,"journal":{"name":"2014 International Conference on Optimization of Electrical and Electronic Equipment (OPTIM)","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128475265","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 : 2014-05-22DOI: 10.1109/OPTIM.2014.6850967
F. Himmelstoss, K. Edelmoser
The progress in light emitting diodes (LEDs), especially in producing ultraviolet light, leads to new applications in medical science and in the area of disinfection. Biological investigations show a greater effectiveness when the ultraviolet light is pulsed. Therefore, converters which enable a fast turn-on and turn-off of the light emitting diodes are necessary. Several concepts to improve the possibility to supply switched loads are shown, and the equations for linear and two-level control are derived from the model equations. Dimensioning hints are given.
{"title":"Converters for pulsing UV-diodes","authors":"F. Himmelstoss, K. Edelmoser","doi":"10.1109/OPTIM.2014.6850967","DOIUrl":"https://doi.org/10.1109/OPTIM.2014.6850967","url":null,"abstract":"The progress in light emitting diodes (LEDs), especially in producing ultraviolet light, leads to new applications in medical science and in the area of disinfection. Biological investigations show a greater effectiveness when the ultraviolet light is pulsed. Therefore, converters which enable a fast turn-on and turn-off of the light emitting diodes are necessary. Several concepts to improve the possibility to supply switched loads are shown, and the equations for linear and two-level control are derived from the model equations. Dimensioning hints are given.","PeriodicalId":298237,"journal":{"name":"2014 International Conference on Optimization of Electrical and Electronic Equipment (OPTIM)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124620082","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 : 2014-05-22DOI: 10.1109/OPTIM.2014.6850883
D. Machidon, M. Istrate, I. Banu
Protection against direct lightning strokes in the power system's equipments is of great concern among the designing and operating personnel due to the severe implications related for such events. A proper designed lightning rod protective system will ensure a higher protection against direct lightning strokes. Although the rolling sphere method is the most used method for designing the lightning rods systems, this method was elaborated according to the electrometrical theory principles which were established in the late '60. Starting with the late '80 and up until the present day new models for estimating the lightning orientation towards the ground emerged, thus establishing a new theory known as leader progression theory. In this paper is presented a new methodology for calculating the lightning protection zones dimensions developed on the base of the new leader progression theory principles, named the attractive radius method.
{"title":"Algorithm based on attractive radius for estimating the lightning protection efficiency","authors":"D. Machidon, M. Istrate, I. Banu","doi":"10.1109/OPTIM.2014.6850883","DOIUrl":"https://doi.org/10.1109/OPTIM.2014.6850883","url":null,"abstract":"Protection against direct lightning strokes in the power system's equipments is of great concern among the designing and operating personnel due to the severe implications related for such events. A proper designed lightning rod protective system will ensure a higher protection against direct lightning strokes. Although the rolling sphere method is the most used method for designing the lightning rods systems, this method was elaborated according to the electrometrical theory principles which were established in the late '60. Starting with the late '80 and up until the present day new models for estimating the lightning orientation towards the ground emerged, thus establishing a new theory known as leader progression theory. In this paper is presented a new methodology for calculating the lightning protection zones dimensions developed on the base of the new leader progression theory principles, named the attractive radius method.","PeriodicalId":298237,"journal":{"name":"2014 International Conference on Optimization of Electrical and Electronic Equipment (OPTIM)","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123217151","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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