This thesis deals with a new solution for medium voltage drives. Load Commutated Inverter (LCI) fed synchronous motor drive is a popular solution for high power drive applications. Though the induction machine is more rugged and cheaper compared to the synchronous machine, LCI fed induction motor drive solution is not available. The basic advantage of a synchronous machine over an induction machine is the fact that the synchronous machine can operate at leading power factor. Due to this property load commutation of SCR switches of the LCI is achievable for synchronous machine. On the contrary an induction machine always draws lagging power factor current; this makes it unsuitable as a drive motor for LCI technology. In this thesis a new LCI fed induction motor drive configuration is developed as an alternative for synchronous motor drives. A new variant of six phase induction motor is proposed in this context. The machine is named as Active Reactive Induction Machine (ARIM). The ARIM contains two sets of three-phase windings with isolated neutral. Both the windings have a common axis. One winding carries the active power and can be wound for higher voltage (say 11kV). The other winding supplies the total reactive power of the machine and can be wound for lower voltage (say 2.2 kV). The rotor is a standard squirrel cage. High power induction machines usually demand lesser magnitude of reactive power compared to the total power rating of the machine ( 20% ). Therefore excitation winding has a smaller fraction of the total machine rating compared to the power winding. A VSI with an LC filter supplies reactive power to the ARIM through the excitation winding and ensures leading power factor at the power winding. This is similar to the excitation control of the LCI fed synchronous machine. The direct VSI connection is possible due to the lower voltage rating for the excitation winding. In this way, the VSI voltage rating does not limit the highest motor voltage that can be handled. An LCI supplies the real power into the ARIM from the power winding. The LCI currents are quasi square wave in shape. Therefore they have rich low order harmonic content. They cause 6th and 12th harmonic torque pulsations in the machine. This is a problem for the LCI fed synchronous machine drive. In the proposed drive, the VSI can compensate these low frequency m.m.f. harmonics inside the machine air gap to remove torque pulsation and rotor harmonic losses. The advantage of the proposed topology is that no transformer is required to drive an 11kV machine. It is always desirable to feed sinusoidal voltage and current to both the power winding and the excitation winding. To address this problem, a second configuration is proposed. A low power three-level VSI is connected in shunt at the power winding with the proposed ARIM drive as discussed above. This VSI compensates the low frequency harmonic currents to achieve sinusoidal motor currents at the motor winding. This VSI acts as a shunt active filter and compensates for the lower order harmonics injected by the LCI. The proposed topologies have LC filters to maintain sinusoidal motor voltages and currents by absorbing the VSI switching frequency components. But the motor terminal voltage oscillates at system resonant frequency due to the presence of LC filters. These resonant components in the terminal voltages are required to be eliminated for smooth terminal voltages and safe load commutation of the thyristors. In this thesis a simple active damping method is proposed to mitigate these issues. The proposed topologies are experimentally verified with an ARIM with 415 V power winding and 220 V excitation winding. The control is carried out on a digital platform having a TMS 320LF 2407A DSP processor and an ALTERA CYCLONE FPGA processor. Results from the prototype experimental drive are presented to show the feasibility and performance of the proposed drive configurations.

This work presents the direct torque control (DTC) techniques, implemented in four- and six-switch inverter, for brushless dc (BLDC) motors with non-sinusoidal back- EMF using two and three-phase conduction modes. First of all, the classical direct torque control of permanent magnet synchronous motor (PMSM) with sinusoidal back-EMF is discussed in detail. Secondly, the proposed two-phase conduction mode for DTC of BLDC motors is introduced in the constant torque region. In this control scheme, only two phases conduct at any instant of time using a six-switch inverter. By properly selecting the inverter voltage space vectors of the two-phase conduction mode from a simple look-up table the desired quasi-square wave current is obtained. Therefore, it is possible to achieve DTC of a BLDC motor drive with faster torque response while the stator flux linkage amplitude is deliberately kept almost constant by ignoring the flux control in the constant torque region. Third, the avarege current controlled boost power factor correction (PFC) method is applied to the previously discussed proposed DTC of BLDC motor drive in the constant torque region. The test results verify that the proposed PFC for DTC of BLDC motor drive improves the power factor from 0.77 to about 0.9997 irrespective of the load. Fourth, the DTC technique for BLDC motor using four-switch inverter in the constant torque region is studied. For effective torque control in two phase conduction mode, a novel switching pattern incorporating the voltage vector look-up table is designed and implemented for four-switch inverter to produce the desired torque characteristics. As a result, it is possible to achieve two-phase conduction DTC of a BLDC motor drive using four-switch inverter with faster torque response due to the fact that the voltage space vectors are directly controlled.. Finally, the position sensorless direct torque and indirect flux control (DTIFC) of BLDC motor with non-sinusoidal back-EMF has been extensively investigated using three-phase conduction scheme with six-switch inverter. In this work, a novel and simple approach to achieve a low-frequency torque ripple-free direct torque control with maximum efficiency based on dq reference frame similar to permanent magnet synchronous motor (PMSM) drives is presented.

Dans ce travail nous cherchons à développer des algorithmes de commande adaptés au fonctionnement à haute vitesse d’une machine synchrone à aimants permanents (MSAP) et de son onduleur en optimisant l’efficacité énergétique de l’ensemble. Bien que la vocation soit très large, le domaine de la traction électrique est priorisé. Les MSAP tournant à haute vitesse sont de plus en plus utilisées dans les véhicules électriques en raison de leur forte densité de puissance. La haute vitesse implique une force électromotrice élevée et requiert la réduction du flux (défluxage) dans l’entrefer. Lors d’un fonctionnement de la machine en régime défluxé, si la contribution de l’aimant peut-être totalement compensée alors nous pouvons utiliser une stratégie Maximum Torque Per Volt (MTPV) pour générer les consignes de courant qui respectent les limites électriques théoriques quelle que soit la vitesse de rotation de la machine. En l’absence de boucle de vitesse, le couple de référence doit être limité aux points de fonctionnement atteignables, calculés en fonction des limites de courant (limites onduleur et machine), tension (batterie) et puissance (batterie et partie mécanique). Nous proposons ainsi dans cette thèse de calculer les références de courant avec une stratégie MTPA (Maximum Torque Per Ampere) à basse vitesse et d’utiliser un algorithme de défluxage basé sur une régulation de la norme de la tension associée à une stratégie MTPV à haute vitesse sans commutation d’algorithme mais par une action continue sur la valeur de la saturation de courant. Concernant la boucle de courant nous réalisons une commande numérique dans le repère d-q qui tient compte de la discrétisation, du retard (dû au temps de calcul), et du fort couplage inter-axes à haute vitesse sous des critères de précision, stabilité et rapidité. Nous étudions les stratégies de découplage minimal et de découplage discret avec prédiction de la variation du courant. Les approches par régulateurs avec structure RST et par commande prédictive-optimale sont développées. Une prédiction de la position réelle du rotor est incluse afin de conserver la stabilité à haute vitesse. Finalement nous réalisons une maquette avec une MSAP à échelle réduite sur laquelle nous testons ces stratégies de commande. Nous validons par expérience que l’algorithme proposé dans la thèse est capable de piloter la machine à haute vitesse en respectant les limites électriques et nous vérifions qu’il améliore les performances (couple, vitesse maximale, pertes) obtenues à haute vitesse. / In this work we search to develop control algorithms adapted to the high speed operation of a permanent magnet synchronous motor (PMSM) and its inverter by optimizing the energy efficiency of the set. Although the vocation is very broad, the field of electric traction is prioritized. High speed PMSMs are increasingly used in electrical vehicles because of their high power density. The high speed implies a high electromotive force and requires the reduction of the flux (fluxweakening) in the air gap. When the motor is running in flux-weakening mode, if the contribution of the magnet can be fully compensated then we can use a Maximum Torque Per Volt (MPTV) strategy to generate the current references that meet the theoretical limits regardless of the machine rotation speed. In the absence of a speed loop the reference torque must be limited to the achievable operating points, calculated according to the current limits (inverter and machine limits), voltage (battery) and power (battery and mechanical part). We propose in this thesis to calculate the current reference with Maximum Torque Per Ampere (MTPA) strategy at low speed and to use a flux-weakening algorithm based on a regulation of the voltage norm associated with a MTPV strategy at high speed without switching algorithms but by a continuous action on the value of the current saturation. Concerning the current loop, we carry out a numerical control in the d-q frame which takes into account the discretization, the delay (due to the computation time), and the high inter-axis coupling at high speed under criteria of precision, stability and speed. We study the strategies of minimal decoupling and discrete decoupling with prediction of the variation of the current. The approaches by regulators with RST structure and predictive-optimal control are developed. A prediction of the actual rotor position is included to maintain the stability at high speed. Finally a real model with a reduced scale PMSM is realized on which these control strategies are tested. We validate by experiment that the algorithm proposed in the thesis is able to control the machine at high speed respecting the electrical limits and verify that it improves the performances (torque, maximum speed, losses) obtained at high speed.

Dans le contexte de l'avion plus électrique, de nouveaux défis technologiques apparaissent dans le développement des systèmes embarqués afin d'augmenter leur puissance électrique. Une optimisation visant la sécurité, l'efficacité énergétique et une diminution du volume et de la masse est ainsi nécessaire. A cet effet, les dispositifs doivent être considérés dans leur ensemble et non par éléments séparés. Pour faciliter l'intégration des systèmes de puissance et assurer la qualité du réseau de bord avion, cette thèse propose de tenir compte de la mission de vol et d'étudier la CIO « Conception Intégrée Optimale » du système complet comprenant le filtre d'entrée et l’onduleur de tension alimentant l'actionneur synchrone à aimants permanents haute vitesse « HSPMSM ». L'application est dédiée au système de conditionnement d'air cabine « ECS – Environmental Conditioning Systems » comprenant le compresseur d'air étudié, d'une puissance nominale de 70 kW. La thèse est structurée en trois parties principales: le dimensionnement des composants de la chaîne de conversion électromécanique ; la conception locale et séquentielle de chacun des composants du système (boucle d'optimisation actionneur puis boucle d'optimisation « onduleur de tension + filtre d'entrée » ; la conception simultanée de tous les composants du système (boucle d'optimisation globale). Les fronts « Pareto-optimaux » des solutions obtenues à partir des méthodes de conception séquentielles et simultanées sont présentés, analysés et comparés. Les résultats mettent clairement en évidence l'avantage d'utiliser une boucle d'optimisation unique pour l'amélioration de la masse et de l'efficacité énergétique du système. / The concept of More Electric Aircraft (MEA) implies new challenges especially due to the increase of the electrical embedded power. By this way, necessary improvements in terms of safety, energy efficiency and weight reduction are required. For this reason, the design of devices should be more approached with a view to the whole system than as separated elements. In order to facilitate power system integration and to ensure power quality aboard, this dissertation proposes an Integrated Optimal Design (IOD) of the input filter and the inverter feeding the High Speed Permanent Magnet Synchronous Motor (HSPMSM) by taking the flight mission into account. The Environmental Conditioning System (ECS) is equipped of the studied cabin air compressor with a rated power of 70 kW: a Multiobjective Genetic Algorithm (MOGA) is applied to achieve the CIO process. Considering the ECS as a whole, this thesis can be divided into three main parts: components sizing of the electromechanical conversion chain; local and sequential design of each system components (HSPMSM optimization loop followed by “voltage source inverter + input filter” optimization loop); simultaneous design of all system components (global optimization loop). Pareto-optimal solutions obtained from sequential and simultaneous design approaches are presented, analyzed and compared. Results clearly highlight the advantage of using a single optimization loop for the whole system in order to improve mass and efficiency.

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / This master thesis proposes a current control technique based on sliding mode strategy and disturbance observer for high-performance drive applied to permanent magnet synchronous motors and can be extended to other systems. The combination of sliding mode control and disturbance observer applied to the current control presents the characteristics necessary to minimize the coupling between the axes, rejection of external disturbances and parametric variations. A continuous time control scheme is developed, the stability proofs are performed from the Lyapunov analysis. The performance of the propose technique is evaluates through simulation results. Moreover, this master thesis presents a discrete-time sliding mode controller combined with a discrete-time disturbance observer. The development in discrete-time enables the implementation in digital processors. The conditions of reach of the proposed controller considering the transport delay of digital implementation are still evaluated. The stability proofs of the proposed scheme are presented. Simulation results are shown. In addition, it is developed an experimental platform for drive and control of the permanent magnet synchronous motor in which the experimental results are obtained. / Esta dissertação propõe uma técnica de controle de corrente baseada na estratégia por modos deslizantes e observador de distúrbios para acionamento de alto desempenho aplicada a motores síncronos de ímãs permanentes, podendo ser estendida a outros sistemas. A combinação do controle por modos deslizantes e do observador de distúrbio aplicada ao controle de corrente apresenta as características necessárias para minimização do acoplamento existente entre os eixos, rejeição a distúrbios externos e variações paramétricas. É desenvolvido um esquema de controle em tempo contínuo, são apresentadas as provas de estabilidade a partir de critério de Lyapunov. O desempenho da técnica proposta é avaliado através de resultados de simulação. Além disso, é apresentado um controlador por modos deslizantes associado ao observador de distúrbio em tempo discreto. O desenvolvimento em tempo discreto possibilita a implementação em processadores digitais de sinais. Ainda são avaliadas as condições de alcance do controlador proposto considerando o atraso de transporte da implementação digital. Provas de estabilidade do esquema proposto e resultados de simulação são apresentados. Este trabalho faz o desenvolvimento de uma bancada experimental para o acionamento e controle do motor síncrono de ímãs permanentes na qual são obtidos os resultados experimentais apresentados.

Made available in DSpace on 2016-12-12T17:38:37Z (GMT). No. of bitstreams: 1 FRANCIELI LIMA DE SA.pdf: 957791 bytes, checksum: 54a198d079685e3726016b54e682ffdc (MD5) Previous issue date: 2010-07-30 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / In this work is introduced a study of Permanent Magnet Synchronous Motor (PMSM), involving issues about constructive characteristics, modeling, control and simulation. Initially, are studied the constructive characteristics, principally in that refers of the magnets disposition in the rotor. Then, are shown some applications for the PMSM. The mathematic model of PMSM is developed starting of stationary reference frame and utilizing the rotation transformation for obtain the equations of currents and voltage in the rotor reference frame. The feed shape of the PMSM is an analysis of extreme importance in the study of this motor, for this reason also is show in this work. The vector control is analyzed in the sequence, utilizing the direct method for the rotor flux and considering the approach with Constant torque control. Are presents some techniques for the design of controllers of speed and current loops. Through the performed simulations, are analyzed and compared the several technical approached. The results obtained show that the vector control approach with constant torque angle applied to the PMSM presents a good dynamic response for motor drive. / Neste trabalho, é apresentado um estudo do Motor Síncrono de Ímãs Permanentes (MSIP) envolvendo questões pertinentes às características construtivas, modelamento, controle e simulação. Inicialmente, são estudadas as características construtivas, principalmente no que se refere à disposição dos ímãs no rotor. Em seguida são mostradas algumas aplicações para o MSIP. O modelo matemático do MSIP é desenvolvido partindo do referencial estacionário e utilizando a transformação de rotação para se obter as equações de corrente e tensão no referencial girante. A forma de alimentação do MSIP é uma análise de extrema importância no estudo deste motor, e por esta razão também é mostrada neste trabalho. O controle vetorial é analisado na seqüência, utilizando o método direto pelo fluxo de rotor e considerando a abordagem com controle de torque constante. São apresentadas algumas técnicas para o projeto dos controladores das malhas de corrente e velocidade. Através das simulações realizadas, são analisadas e comparadas as diversas técnicas abordadas. Os resultados obtidos mostram que o controle vetorial com abordagem do ângulo de torque constante aplicado ao MSIP apresenta uma boa resposta dinâmica para o acionamento do motor.

Este trabalho trata de um estudo teórico sobre o MMPI. Inicialmente, apre-sentamos um levantamento bibliográfico sobre o MMPI evidenciando os seus aspectos construtivos, seu funcionamento, suas características operacionais e suas possíveis aplicações. Em seguida, elaboramos um modelo físico fundamentado nas teorias do Motor de Indução Duplamente Alimentado (MIDA) e do Motor de Histerese (MH), o qual agrega as principais características operacionais do MMPI e reproduz o processo dinâmico de inscrição de pólos na periferia do rotor. A partir deste modelo físico propomos um modelo matemático, baseado na teoria dos circuitos magneticamente acoplados, constituído pelo equacionamento do MIDA, do MH e das fontes de alimentação do estator e do rotor. Deduzimos teoricamente todos os parâmetros necessários para a simulação computacional. Executamos a sua simulação computacional no software Matlab/SimulinkTM, cujos resultados ilustram o comportamento dinâmico das suas tensões, correntes, fluxos e mecânica. Comparando-se os resultados obtidos na simulação computacional com testes laboratoriais executados pelo CE-PEL, concluímos que o modelo matemático proposto e os parâmetros deduzidos podem ser considerados validados. Finalizando, sugerimos um motor monofásico de pólos lisos a imãs permanentes como uma alternativa mais simples do ponto de vista construtivo, porém com características operacionais semelhantes às do MMPI. / This work deals with a theoretical study on Written-PoleTM single-phase motor. Initially, we present the results from the bibliographical research on the Written-PoleTM motor, evidencing its constructional features, operation process, operational characteristics and some possible applications. Afterwards, we elaborate a physical model based in the theories of the doubly fed induction motor and the hysteresis motor, which incorporates the operational characteristic of Written-PoleTM motor and reproduces the written-pole dynamic process. Starting from this physical model we propose a mathematical model, based on the theory of the magnetically coupled circuits, constituted by the set of differential equations deduced from the doubly fed induction motor, the hysteresis motor and the stator and rotor voltage sources. We deduced theoretically all the computational simulation necessary parameters. We perform its computational simulation in the software Matlab/SimulinkTM, whose results illustrate the dynamic behavior of its voltages, currents, fluxes, torques and speed. Comparing the results obtained from the computational simulation with the CEPEL\'s test results, we concluded that the proposed mathematical model and the deduced parameters can be considered validated. Finally, we suggest a permanent-magnet smooth-pole single-phase motor as an alternative to Written-PoleTM motor. This alternative, even being simpler from the constructional point-of-view, presents operational characteristics similar to the Written-PoleTM single-phase motor.

The aim of this thesis is to design the water-cooling system for a synchronous motor with an output of 10kW. The power loss was analytically determinated. For the initial water-cooling system and for two design proposals, thermal models were calculated in Ansys. The same boundary conditions were set for all three models. Then the analysis results of the temperature distribution on the machine surface and in the slots were compared. The comparison also includes the economical cost of the production and service of the machine. Then the production documentation was created, consisting of the assembly drawings and a simplified technological process.

The thesis is focused on the issue of sensorless vector control of a synchronous motor with permanent magnets in the low-speed range. In the first part, there is a brief description of the synchronous motor and the necessary transformations for the application of vector control. This is followed by the overview of sensorless methods for position estimation by injecting a high-frequency harmonic signal. The practical part is devoted to the implementation of a control algorithm to develop kit STM32NUCLEO-L476RG, which is preceded by the identification of all engine parameters. As part of the implementation, a structure including current, speed and position control was designed. The functionality and robustness of the settings have been successfully tested due to the different inertia and load.

This work discusses about nowadays problematic of the electronic comutation motors.This work also describes the opportunity of electronic control of these motors. The result of this work is realization of electronic control circuit from discreet components. There also are mentioned is proposal of electronic control board from SMD components. This control board include temperature control with ventilator switching , commutation logic, PWM speed control. In the last part of this paper are results of evaluation measurements of EC motor.