3 documents found, page 1 of 1
Fast-Field Cycling Nuclear Magnetic Resonance relaxometer's electromagnet with ...
Videira, P.; Sebastião, P.; Roque, António; Sousa, D. M.; Margato, E.In this article a Fast Field Cycling (FFC) Nuclear Magnetic Resonance (NMR) electromagnet with low power consumption (less than 200 W), high field homogeneity and reduced volume is projected and described. The electromagnet is iron and copper based, possessing a high permeability and allowing for good magnetic field homogeneity in the operating range of 0 to 0.33 T. With this solution, it is possible to increas...
Simulation of the magnetic induction vector of a magnetic core to be used in FF...
Roque, António; Ramos, Sérgio; Barão, José; Machado, M.; Sousa, D. M.; Margato, E.; Maia, J.This paper is a contribution for the assessment and comparison of magnet properties based on magnetic field characteristics particularly concerning the magnetic induction uniformity in the air gaps. For this aim, a solver was developed and implemented to determine the magnetic field of a magnetic core to be used in Fast Field Cycling (FFC) Nuclear Magnetic Resonance (NMR) relaxometry. The electromagnetic field ...
A new control strategy with saturation effect compensation for an autonomous in...
Margato, E.; Faria, J.; Resende, M. J.; Palma, J.This paper presents a variable speed autonomous squirrel cage generator excited by a current-controlled voltage source inverter to be used in stand-alone micro-hydro power plants. The paper proposes a system control strategy aiming to properly excite the machine as well as to achieve the load voltage control. A feed-forward control sets the appropriate generator flux by taking into account the actual speed and ...