Self-bearing machines for kinetic energy storage have the advantage of integrating the magnetic bearing in the stator/rotor configuration, which reduces the number of mechanical components needed compared with using separated active magnetic bearings. This master's thesis focus on building a MATLAB/Simulink simulation model for a self-bearing cone-shaped Lorenz-type electrical machine. The concept has already been verified analytically but no dynamic simulations have been made. The system was modeled as a negative feedback system with PID controllers to balance the rotor. Disturbances as signal noise, external forces and torques were added to the system to estimate system robustness. Simulations showed stability and promising dynamics, the next step would be to build a prototype.

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