Made available in DSpace on 2014-12-17T14:54:48Z (GMT). No. of bitstreams: 1 JoseAP.pdf: 3661698 bytes, checksum: ce1565573ad07f2677ac0b9d8cde09d8 (MD5) Previous issue date: 2007-12-07 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico / This work describes the study and the implementation of the vector speed control for a three-phase Bearingless induction machine with divided winding of 4 poles and 1,1 kW using the neural rotor flux estimation. The vector speed control operates together with the radial positioning controllers and with the winding currents controllers of the stator phases. For the radial positioning, the forces controlled by the internal machine magnetic fields are used. For the radial forces optimization , a special rotor winding with independent circuits which allows a low rotational torque influence was used. The neural flux estimation applied to the vector speed controls has the objective of compensating the parameter dependences of the conventional estimators in relation to the parameter machine s variations due to the temperature increases or due to the rotor magnetic saturation. The implemented control system allows a direct comparison between the respective responses of the speed and radial positioning controllers to the machine oriented by the neural rotor flux estimator in relation to the conventional flux estimator. All the system control is executed by a program developed in the ANSI C language. The DSP resources used by the system are: the Analog/Digital channels converters, the PWM outputs and the parallel and RS-232 serial interfaces, which are responsible, respectively, by the DSP programming and the data capture through the supervisory system / Este trabalho descreve o estudo e a implementa??o do controle vetorial de velocidade de uma m?quina de indu??o sem mancais trif?sica com bobinado dividido de 4 p?los e 1.1kW utilizando estima??o neural de fluxo do rotor. O controle vetorial de velocidade opera em conjunto com os controles de posicionamento radial e das correntes nos enrolamentos de cada fase do estator. Para o posicionamento radial utilizam-se as for?as controladas pelos campos magn?ticos no interior da m?quina. Para a otimiza??o das for?as radiais operando com influ?ncia m?nima do torque rotacional, foi utilizado um modelo especial de bobinado do rotor com circuitos independentes. A estima??o neural de fluxo aplicada ao controle vetorial de velocidade tem o objetivo de compensar a depend?ncia dos estimadores convencionais em rela??o ?s varia??es nos par?metros da m?quina devido a aumentos de temperatura ou satura??o magn?tica do rotor. O sistema de controle implementado possibilita uma compara??o direta dos respectivos desempenhos de velocidade e posi??o radial da m?quina sob orienta??o do estimador neural em rela??o ao estimador convencional de fluxo. Todo o controle do sistema ? realizado por um programa desenvolvido em linguagem padr?o ANSI C. Os recursos do DSP utilizados pelo sistema s?o: os canais de convers?o A/D, as sa?das PWM e as interfaces paralela e serial RS-232, as quais s?o respons?veis, respectivamente, pela programa??o do DSP e a captura de dados atrav?s de um sistema de supervis?o

Made available in DSpace on 2014-12-17T14:55:05Z (GMT). No. of bitstreams: 1 FranciscoCHQ.pdf: 791868 bytes, checksum: bd94a6e450520ec9b64d043384db8ccb (MD5) Previous issue date: 2008-03-17 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / This work describes the study and the implementation of the speed control for a three-phase induction motor of 1,1 kW and 4 poles using the neural rotor flux estimation. The vector speed control operates together with the winding currents controller of the stator phasis. The neural flux estimation applied to the vector speed controls has the objective of compensating the parameter dependences of the conventional estimators in relation to the parameter machine s variations due to the temperature increases or due to the rotor magnetic saturation. The implemented control system allows a direct comparison between the respective responses of the speed controls to the machine oriented by the neural rotor flux estimator in relation to the conventional flux estimator. All the system control is executed by a program developed in the ANSI C language. The main DSP recources used by the system are, respectively, the Analog/Digital channels converters, the PWM outputs and the parallel and RS-232 serial interfaces, which are responsible, respectively, by the DSP programming and the data capture through the supervisory system / Este trabalho descreve o estudo e a implementa??o de um controle vetorial de velocidade para um motor de indu??o trif?sico de 1.1 kW / 4 p?los utilizando estima??o neural de fluxo do rotor. O controle vetorial de velocidade opera em conjunto com o controle das correntes nos enrolamentos de cada fase do estator. A estima??o neural de fluxo aplicada ao controle vetorial de velocidade tem como objetivo compensar a depend?ncia dos estimadores convencionais em rela??o ?s varia??es nos par?metros da m?quina devido a aumentos de temperatura ou satura??o magn?tica do rotor. O sistema de controle implementado possibilita uma compara??o direta dos respectivos desempenhos de velocidade sob orienta??o do estimador neural em rela??o ao estimador convencional de fluxo. Todo o controle do sistema ? realizado por um programa desenvolvido em linguagem padr?o ANSI C. Os principais recursos do DSP utilizados pelo sistema s?o, respectivamente, os canais de convers?o A/D, as sa?das PWM e as interfaces paralela e serial RS-232, as quais s?o respons?veis, respectivamente, pela programa??o do DSP e a captura de dados atrav?s de um sistema de supervis?o

Made available in DSpace on 2014-12-17T14:55:23Z (GMT). No. of bitstreams: 1 JossanaMSF.pdf: 3270599 bytes, checksum: 40178fe964bc435931b6916c9599f55a (MD5) Previous issue date: 2006-11-10 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / This work presents a model of bearingless induction machine with divided winding. The main goal is to obtain a machine model to use a simpler control system as used in conventional induction machine and to know its behavior. The same strategies used in conventional machines were used to reach the bearingless induction machine model, which has made possible an easier treatment of the involved parameters. The studied machine is adapted from the conventional induction machine, the stator windings were divided and all terminals had been available. This method does not need an auxiliary stator winding for the radial position control which results in a more compact machine. Another issue about this machine is the variation of inductances array also present in result of the rotor displacement. The changeable air-gap produces variation in magnetic flux and in inductances consequently. The conventional machine model can be used for the bearingless machine when the rotor is centered, but in rotor displacement condition this model is not applicable. The bearingless machine has two sets of motor-bearing, both sets with four poles. It was constructed in horizontal position and this increases difficulty in implementation. The used rotor has peculiar characteristics; it is projected according to the stator to yield the greatest torque and force possible. It is important to observe that the current unbalance generated by the position control does not modify the machine characteristics, this only occurs due the radial rotor displacement. The obtained results validate the work; the data reached by a supervisory system corresponds the foreseen results of simulation which verify the model veracity / Este trabalho apresenta um modelo para a m?quina de indu??o sem mancais com bobinado dividido. O principal objetivo consiste na obten??o do modelo da m?quina para que possam ser implementados controladores mais eficientes. Para se alcan?ar tal modelo, fez-se uso dos mesmos artif?cios utilizados para as m?quinas convencionais adotados na literatura, o que possibilitou um manuseio simplificado das vari?veis envolvidas. A m?quina estudada ? uma adapta??o de uma m?quina de indu??o convencional, o que foi poss?vel dividindo-se os enrolamentos do estator e tornando acess?veis todos os seus terminais. Essa t?cnica dispensa o acr?scimo de um outro enrolamento ao estator para a realiza??o do controle de posi??o radial, o que resulta em uma m?quina mais compacta. Uma outra caracter?stica dessa m?quina ? a varia??o da matriz de indut?ncias em fun??o do deslocamento radial do rotor, a varia??o do entreferro produz varia??es no fluxo e conseq?entemente nos valores de indut?ncias tanto pr?prias quanto m?tuas. O modelo da m?quina convencional pode ser utilizado para a m?quina sem mancais quando o rotor estiver fixo no centro, por?m em situa??es de deslocamento radial esse modelo falha e n?o pode ser? plicado. A m?quina em quest?o possui dois conjuntos motor+mancal, ambos de quatro p?los, e foi projetada com seu rotor na posi??o horizontal, o que incluiu algumas dificuldades ? implementa??o. O rotor utilizado possui caracter?sticas peculiares, o qual ? projetado de acordo com as exig?ncias da m?quina, a fim de render o maior torque e for?a poss?veis. ? importante observar que o desbalanceamento de correntes, gerado pelo controle de posi??o radial, n?o modifica os par?metros da m?quina, isso apenas ocorre devido ao deslocamento radial do rotor. Os resultados apresentados viabilizaram a valida??o do trabalho, os dados obtidos atrav?s de um sistema supervis?rio condizem com os previstos em simula??o, o que atesta a veracidade do modelo

Orientador: Edson Bim / Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e de Computação / Made available in DSpace on 2018-08-06T02:49:03Z (GMT). No. of bitstreams: 1 Segnini_HelioHenriquedeAgostini_M.pdf: 1646244 bytes, checksum: d03ec95486ccbccae70ffedf89d964f1 (MD5) Previous issue date: 2006 / Resumo: O objetivo deste trabalho é estudar o modelo da máquina de indução duplamente alimentada no sistema de referência síncrono, bem como controlar seu fluxo de potências através de orientação de fluxo. São analisadas as orientações de fluxo de estator, de entreferro e de rotor em várias operações: compensador de reativos, gerador e motor, com fator de potência indutivo, capacitivo e unitário, nas faixas de velocidade subsíncrona, síncrona e supersíncrona / Abstract: The purpose of this work is to study the Doubly Fed Induction Machine modeling at the synchronous reference frame, as well as to control its power flux by flux oriented control The stator, rotor and air gap flux orientations with the machine operating as reactive compensator, generator and drive, with lag power factor, lead power factor and unity power factor at subsynchronous, synchronous and supersynchronous speeds are analyzed. / Mestrado / Energia Eletrica / Mestre em Engenharia Elétrica

Orientador: Edson Bim / Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Elétrica e de Computação / Made available in DSpace on 2018-08-21T12:34:50Z (GMT). No. of bitstreams: 1 Jacomini_RogerioVani_D.pdf: 15030828 bytes, checksum: 7c0af103e9c6a3a9527e3c25e4373e7e (MD5) Previous issue date: 2012 / Resumo: O resumo poderá ser visualizado no texto completo da tese digital / Abstract: The abstract is available with the full electronic document / Doutorado / Energia Eletrica / Doutor em Engenharia Elétrica

Dans ce mémoire de thèse nous présentons une méthodologie pour le diagnostic et la surveillance en ligne des éoliennes de l'état de l'ensemble machine électrique onduleur à partir de la mesure du champ magnétique continu. Ce travail est scindé en deux parties complémentaires. Dans la première partie, nous donnons quelques contributions concernant l'estimation de l'état et des paramètres pour certaines classes de systèmes non linéaires. Ces mêmes estimateurs ont été validés en simulation et sur un banc d'essai. La deuxième partie porte sur la mise en œuvre et la conception de deux bancs d'essai utilisés pour l'étude des défauts dans un système double alimentation MADA et un ensemble moteur électrique onduleur classique pour l'analyse des défauts du convertisseur. L'identification des paramètres et la technique de contrôle du système en boucle fermé est introduite pour l'application MADA. De plus, les capteurs virtuels sont conçus pour estimer la vitesse mécanique qui est utilisée pour calculer les fréquences caractéristiques défectueuses, et le signal de couple mécanique qui exerce une influence sur l'amplitude de certaines des signatures défectueux typiquement. Finalement, sur la base de la mise en équation théorique des signaux électriques avec défauts puis des simulations correspondantes, une comparaison avec l'expérimentation est réalisée pour valider la technique proposée. Ces travaux montrent l'avantage d'une telle technique dans la simplicité de l'instrumentation mis en œuvre / This doctoral thesis presents a methodology for the online condition monitoring of the electrical power drive in wind energy systems based on the local measurement of the DC-bus magnetic field. The work is divided into two complementary parts. In the first part, some contributions related to the estimation of the state and parameters for certain classes of nonlinear systems are provided. The estimators have been validated in simulation and on test benches. The second part focuses on the implementation and control design of two benchmarks used to study defects in a doubly-fed induction generator (DFIG) system and an induction motor power drive. In the former benchmark, the parameters identification of the induction machine and the controller design of the DFIG system are carried out. For the latter test bench, the notable work is to build an induction machine drive for the purpose of fault investigation, in which a PWM generator is developed to control and create the fault of the converter. Furthermore, virtual sensors are designed to estimate mechanical speed that is used to calculate the characteristic frequencies, and mechanical torque signal that has influence on the amplitude of some typical fault signatures. Finally, based on the theoretical aspect of the selected faults, the relevant simulations are developed and experiments are implemented on the benchmarks in order to validate the proposed technique. It has been shown that the diagnostic relying on the magnetic field measurement is feasible and offers various advantages such as simplicity and cost-effectiveness

Les travaux de cette thèse portent sur la méthodologie de conception par optimisation d’une chaine de traction de véhicule électrique en phase amont du développement. Dan une première partie, nous avons abordé le contexte environnemental du transport afin d poser la problématique de la conception systémique d’une chaine de traction électrique composée d’une transmission, une machine électrique asynchrone, un onduleur et un batterie. Le cas test est celui du Renault Twizy. La seconde partie explore les possibilité de modélisation puis détaille les modèles analytiques qui ont été choisis pour chaque composant. L’assemblage de ces modèles permet une estimation de l’autonomie d véhicule, au travers du calcul des pertes des composants, et du cout de la chaine d traction. La troisième partie est consacrée aux méthodes et stratégies d’optimisation afin d pouvoir exploiter le modèle système en incluant le cycle de roulage, le contrôle de l machine électrique et les différentes physiques des composants, tout en conservant de temps de calcul raisonnable. Enfin, la dernière partie présente des résultats d’optimisation en comparant différents jeux de variables et objectifs, soulignant l’importance d’un conception systémique. Des essais sur banc permettent de valider les hypothèses qui on été posées / The works of this thesis concern the optimal design methodology of an electric vehicl powertrain, in early development phase. The first part of this report introduces th environmental context of transportation in order to assess the problem of system design o an electric powertrain which includes a transmission, an induction machine, an inverter an a battery. The selected study case is a Renault Twizy. The second part deals with modelin choices and details the analytic models of the components. Then these models are pu together to get an estimate of the vehicle range, by calculating the components’ losses an the powertrain cost. The third part is devoted to methods and optimization strategies wit the objective to use the systemic model with driving cycles, electric machine control and th physics of each component, without increasing too much computing times. The final par presents results from optimal designs, by comparing several variables or objectives sets Results show how significant the systemic design is. Experiments on a test bench allow validating the hypothesis that have been made

At present, one of the main issues in electric power networks is the reduction in conventional generation and its replacement by low inertia renewable energy generation. The balance between generation and demand has a direct impact on the system frequency and system inertia limits the frequency rate of change until compensation action can be undertaken. Traditionally generation managed frequency. In future, loads may be required to do more than just be able to be switched off during severe under frequency events. This thesis focuses on the development and practical implementation of the control structure of a smart adaptive load for network power-frequency support applications. The control structure developed makes use of advanced demand side management of fan loads (powered by AC drives) used in heating, ventilation, and air conditioning systems; where a change in power at rated load has little effect on their speed due to the cubic relationship between speed and power. The AC drive implemented in this thesis is based on an induction motor and a two level voltage source converter. To achieve the smart adaptive load functionality, first a power-frequency multi-slope droop control structure (feedforward control) is developed; relating the frequency limits imposed by the network supplier and the fan power-speed profile (Chapter 2, Fig 2.19). Secondly, this control structure is combined with the control developed, in Chapter 3, for the AC drive powering the fan load. The full development of the control structure of the AC drive, its tuning process and its practical implementation is given; an equation is developed to find suitable tuning parameters for the speed control of the nonlinear load (fan load), i.e. Eq. (3.59).The analysis and simulation results provided in Chapter 4 conclude that a fast control of the active power drawn by the AC drive is possible by controlling the electromagnetic torque (hence current) of the induction motor without disturbing the fan load overly. To achieve this, changes between closed loop speed control and open loop torque control (power control) are performed when needed. Two main issues were addressed before the hardware implementation of the smart adaptive load: the estimation of the network frequency under distorted voltage conditions, and the recovery period of the network frequency. In this thesis two slew rate limiters were implemented to deal with such situations. Other possible solutions are also outlined. Finally, experimental results in Chapter 5 support results given in Chapter 4. A full power-frequency response is achieved by the smart adaptive load within 3s.

This master’s thesis first deals with the theory concerning induction motor. It briefly desbribes the construction of three-phase induction motors, the generation of tractive force, power flow with loss distribution and also torque characteristic. In the next part an analytical calculation of the parameters of equivalent circuit for an existing induction motor with known dimensions is performed. After the calculation it is possible to find out the rated parameters of the motor, which makes it possible to further compare results with the values obtained by other methods. The next step was to create a model of the motor in RMxprt program, which is later also translated to ANSYS Maxwell 2D model. Simulations were carried out in both interfaces. As the next step the results obtained by the three methods are compared with measured values and also evaluated. The final part of the thesis focuses on the optimization of the magnetic circuit for higher frequencies. Efficiency of the modified induction motor is examined for higher frequencies using RMxprt Optimetrics and this procedure is performed for both default and alternative electrical steel materials.

Aujourd'hui, l'électrification des véhicules constitue une des solutions mises en œuvre par les constructeurs automobiles dans la lutte contre les émissions de gaz polluants et pour la réduction des consommations. Comme le prix des aimants terres rares a fortement augmenté ces dernières années, les moteurs électriques sans aimants permanents sont attractifs, comme les moteurs asynchrones, synchrones à rotor bobiné, à réluctance variable (double saillance ou synchrone). Dans cette thèse, les machines asynchrones et synchrones à réluctance variable sont étudiées et comparées pour des véhicules électriques. Ces deux machines ont un coût faible et possèdent des structures de puissance et de contrôles similaires.Des modèles analytiques non linéaires de machines asynchrones et synchrones à réluctance variable sont établis et validés. En outre, leurs modèles économiques et mécaniques sont également mis en œuvre. Sur la base des modèles analytiques établis, la géométrie et les paramètres de commande des machines étudiées sont dimensionnés afin de réduire les pertes énergétiques durant des cycles de conduite. Une optimisation bi-objective est proposée afin de minimiser en même temps les pertes énergétiques et le coût du moteur. Enfin, les machines optimisées sont comparées, à l’aide de Fronts de Pareto, pour évaluer leurs performances électriques, énergétiques et économiques. / Today, the concerns of the energy crisis and the reduction of gas emissions stimulate the research in several electric vehicle domains. As the cost of rare earth magnetic materials has increased significantly in recent years, electrical motors without permanent magnets draw more attention, such as induction motors, wound-synchronous motors, switched reluctance motors, and synchronous reluctant motors. In this thesis, induction and synchronous reluctant machines are chosen to be studied for the electric vehicle traction application since they are low costly and fed up with similar power electronics and control strategies.Nonlinear analytical models of induction and synchronous reluctant machines are established and validated. Besides, economical and mechanical models are developed as well. Based on established analytical models, the geometry and the control parameters of these studied machines are calculated to define the total energy losses during the driving cycle. A bi-objective optimization is carried out to minimize total energy losses and motor costs. At last, the optimized machines are compared from their electric, energetic and economic performances, with the help of the Pareto Fronts obtained.