Artigos
URI permanente para esta coleçãohttps://repositorio.fei.edu.br/handle/FEI/796
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Resultados da Pesquisa
- Vector control of a high speed induction machine supported by magnetic bearings(2015-11-09) FUMAGALLI, M. A.; Fabio Lima; ROSA, F. C.© 2015 IEEE.This paper presents the rotor field oriented control (RFOC) of an induction motor supported by magnetic bearings. The shaft of the motor is supported by two radial and one axial magnetic bearings. The rotor was inserted at the center of the shaft, which will operate as motor as well as generator, and at the shaft extremity is coupled a small turbine. The mechanical modeling and assembly are presented in details. After that the control system of the AMB is introduced. The RFOC modelling with impressed stator currents is so introduced. The mechanical and electrical system was constructed in a test bench and the experimental results confirm the good dynamic response of the system. It is the intention to use the system in the future for generating electrical energy from gas sources.
- Petri net application in simulation of ambulatory processes(2015-11-09) Fabio Lima; CORTEZ, M. F. R.; SCHMIDT. P. P.; SILVÉRIO. A. K.; CHANG, J.© 2015 IEEE.This paper presents a simulation of an ambulatory processes using timed Petri net (TPN). The simulation considers the flow of patients in the biggest Brazilian cardiology hospital. The TPN is used as a decision support system (DSS) in order to improve the processes, to reduce the waiting time of the patients in the ambulatory and in this way to assure a high quality service to the patients. Simulations were carried out using the software Visual Object Net++. This is a free software and therefore the presented solution is a low cost solution. To provide a low cost solution is very important since the hospital is kept from the government and operates with limited financial resources. The patients' workflow in the hospital can be faced as a service and the modelling and optimization of these services bring more efficiency to the system as well as improve the human factors involved.