Modelagem de máquina de indução trifásica sem mancais com bobinado dividido

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

Sobre o problema da mentira na filosofia prática de Kant

The research examines the problem lie in the thought of Immanuel Kant. This field of law, of the history of political morality, we seek to investigate the Kantian rejection of falsehood and unconditional obligation to be truthful. Defends the thesis of the exception to lie and not be objectionable in two cases, namely: the torture and before the murderer. Thus, it is demonstrated that it is possible the exception to lie under the law, politics and history, considering the perspective of harmony of external freedoms and the idea of moral progress. In this sense, it is argued that the source of law is established to guarantee the external freedoms. From the point of view of morality, reaffirmed the absoluteness is that for Kant the duty of veracity, but it points to the possibility of a practical rule that allows the lie based on human dignity, weighting values as political equality, respect for rational agents, as well as the principle of humanity which teaches always treat the other as an end in itself.