Switched Reluctance Machines (SRMs) are receiving significant attention from industries in the last decade. They are extremely inexpensive, reliable and weigh less than other machines of comparable power outputs. Although the design principles of the machine are available as a concatenation of many different sources, the need for a unified, step-by-step design procedure from first principles of electromagnetics is an absolute requirement. This dissertation discusses a procedure that can be applied by engineers with a basic background in electromagnetics. Subsequent to the design of the machine, existing finite element software can do the analysis of the machine. However, this is a laborious process and the need for an analytical method is preferable to verify the design procedure before the final verification by finite elements. The analytical procedure as well as a procedure to calculate iron losses is also developed in this dissertation. A prototype machine has been developed as an example of the design process and an existing prototype is analyzed to verify the analysis procedure. The similarities between the SRM and the Permanent Magnet Brushless DC Machine (PMDBC) beg the consideration of the development of a converter that can be used to drive either machine. One such converter has been developed in this dissertation. The design of the drive for both the machines is seen to be very similar. As a consequence, a universal controller that can be used to operate both machines has been developed and implemented with a DSP. Simulations and experimental correlation for both drives have been presented. / Ph. D.

Submitted by Renata Lopes (renatasil82@gmail.com) on 2017-04-18T15:37:21Z No. of bitstreams: 1 rodolfolacerdavalle.pdf: 15632691 bytes, checksum: 70a89dc2e4e38eb468aa2013be66ab1f (MD5) / Approved for entry into archive by Adriana Oliveira (adriana.oliveira@ufjf.edu.br) on 2017-04-19T11:31:54Z (GMT) No. of bitstreams: 1 rodolfolacerdavalle.pdf: 15632691 bytes, checksum: 70a89dc2e4e38eb468aa2013be66ab1f (MD5) / Made available in DSpace on 2017-04-19T11:31:54Z (GMT). No. of bitstreams: 1 rodolfolacerdavalle.pdf: 15632691 bytes, checksum: 70a89dc2e4e38eb468aa2013be66ab1f (MD5) Previous issue date: 2017-02-02 / Esta tese apresenta as etapas de projeto e de implementação de um controlador digital preditivo para regular as correntes de um motor CC de ímãs permanentes sem escovas (do inglês, Permanent Magnets Brushless DC motor) (BLDC) de baixa indutância, trifásico a três fios. Estes tipos de motores são usualmente acionados por conversores eletrônicos de potência com múltiplos estágios, comutados em altas frequências, ou usam filtros adicionais para limitar as ondulações de corrente. As formas de onda da força contra eletromotriz induzida e das correntes retangulares dificulta o projeto e sintonia de controladores lineares. A complexidade desta tarefa aumenta quando se considera a ampla faixa de velocidade de operação do motor. Controladores digitais preditivos são facilmente implementados em processadores digitais de sinais, tendo sido usados com sucesso para regular correntes de diferentes tipos de conversores eletrônicos de potência. Três estratégias de comutação (bipolar, unipolar síncrona e unipolar) são usadas para obter três controladores PWM preditivos para regular as correntes retangulares do motor BLDC, sem a necessidade de filtros ou conversores adicionais. O fato das correntes fluírem por apenas duas das fases do motor em cada intervalo de π/3 rad permite operar o inversor fonte de tensão trifásico (Voltage Source Inverter) (VSI) como um conversor CC-CC em ponte completa. Esta característica simplifica o algoritmo de controle sendo necessário apenas um controlador para as correntes trifásicas. Parcelas para compensar o erro em regime permanente devido ao tempo morto, queda de tensão nos interruptores e atrasos de amostragem e de disparo dos interruptores são incorporadas à lei de controle modificada. Resultados experimentais e de simulação para um motor BLDC trifásico de 5 kW/48 V são apresentados para demonstrar a viabilidade da proposta. O algoritmo de controle do sistema de acionamento do motor BLDC foi implementado usando o controlador digital de sinais TMS320F28335. / This thesis presents the design and implementation steps of a digital predictive controller to regulate a low–inductance, three–phase, three–wire permanent magnet brushless DC (BLDC) motor currents. These types of motors are usually driven by multi-stage converters, switched at high frequencies, or use additional inductances to limit the current ripple. The motor’s trapezoidal back electromotive force and rectangular currents waveforms make the design and the tuning process of linear controllers difficult. This task complexity increases when a wide speed range is considered. Digital predictive controllers are easily implemented using digital signal processors (DSP), as successfully used for different types of power electronic converters currents regulation. Three switching strategies (bipolar, synchronous unipolar e unipolar) are used to obtain three PWM predictive controllers to regulate the rectangular currents of a brushless DC motor, without the need for any additional filters or converter. Due the fact that the currents flow only between two phases of the motor at every π/3 rad period makes possible to operate the three-phase voltage source inverter as a full-bridge DC–DC converter. This feature simplify the control algorithm which requires only one controller to synthesize the three-phase currents. A methodology to eliminate the steady-state error due to blanking time, switches voltage drop, sampling delay and pulse driver delay were incorporated in the modified predictive control law. Experimental and simulation results using a 5 kW/48 V three–phase BLDC motor are presented to demonstrate the feasibility of this proposal. The control algorithm was implemented in a digital signal controller TMS320F28335.

Submitted by Renata Lopes (renatasil82@gmail.com) on 2017-04-24T18:25:05Z No. of bitstreams: 1 rodolfolacerdavalle.pdf: 17326163 bytes, checksum: b5bfc03806c064bdf98c9890ed322936 (MD5) / Approved for entry into archive by Adriana Oliveira (adriana.oliveira@ufjf.edu.br) on 2017-04-25T12:14:13Z (GMT) No. of bitstreams: 1 rodolfolacerdavalle.pdf: 17326163 bytes, checksum: b5bfc03806c064bdf98c9890ed322936 (MD5) / Made available in DSpace on 2017-04-25T12:14:13Z (GMT). No. of bitstreams: 1 rodolfolacerdavalle.pdf: 17326163 bytes, checksum: b5bfc03806c064bdf98c9890ed322936 (MD5) Previous issue date: 2013-03-07 / Esta dissertação apresenta as etapas de desenvolvimento de um sistema de acionamento de um motor CC de ímãs permanentes sem escovas para aplicação em veículos elétricos de pequeno porte. O motor é acionado por um inversor fonte de tensão trifásico (VSI, Voltage Source Inverter) baseado em interruptores IGBT (Insulated Gate Bipolar Transistor). Os sinais de comutação dos interruptores são gerados por uma estratégia de modulação vetorial. Sinais gerados por três sensores de efeito Hall são usados para detectar a posição angular do rotor. O motor é controlado a partir de duas malhas. Uma malha externa controla a velocidade enquanto a malha interna controla as correntes de fase do motor. O desempenho de dois tipos de controladores foram investigados para o controle das correntes sintetizadas pelo VSI: (i) controlador proporcional– integral no sistema de coordenadas síncrono e (ii) controlador proporcional–integral com integradores em múltiplos sistemas de coordenadas rotativas. Além das malhas de controle, o sistema de acionamento foi projetado com uma estratégia de desacoplamento das correntes de controle e uma ação preditiva para compensar o efeito das tensões contra–eletromotriz trapezoidais geradas por fase pelo motor. Um protótipo experimental do sistema de 5 kW foi montado em laboratório. Os algoritmos de controle do motor e do VSI, juntamente com o algoritmo de deteção de posição do rotor foi implementado em um controlador digital de sinais TMS320F28335. Resultados experimentais são apresentados, discutidos e utilizados para validar as estratégias de controle. / This dissertation presents the development of a permanent magnet brushless DC motor drive (PMBLDC) for small electric vehicles applications. A three–phase voltage source inverter (VSI) based on IGBT (insulated gate bipolar transistor) is used to drive the electric motor. The semiconductor switches are controlled by space vector modulation (SVM). Signals from three Hall effect sensors are used to detect the rotor angular position. Two closed–loops are used to control the PMBLDC motor. The outer loop controls the rotor velocity while the inner loop controls the motor phase currents. Two types of controllers were investigated to synthesize the currents: (i) proportional– integral controller in synchronous reference frame and (ii) proportional–integral controller with multiple rotating synchronous reference frame integrators. Besides the current control loops, the drive system was designed considering the decoupling of the synthesized phase currents and a feed-forward electromotive force waveform compensation. An experimental prototype of 5 kW was built in laboratory. The motor and VSI control algorithms and the algorithm used to detect the rotor position were implemented in a TMS320F28335, digital signal controller. Experimental results are presented, discussed along with the validation of the control strategy.