MODELACIÓN DEL COMPORTAMIENTO TEMPORAL DE LA TEMPERATURA Y EL VOLTAJE EN IMANES RESISTIVOS DE EQUIPOS DE RMI (original) (raw)
The aim of this article is to provide a method for the modeling of temporal thermal behavior for resistive magnet of a Nuclear Magnetic Resonance (NMR) machine. The model constitutes an important tool for the design of this equipment and the prediction of significant parameters (like operation current or the fit selection of the direct current source). The modelation of thermal transient regime with internals heat sources is based in the balance of energy in the wire of each coil of the magnet. Applying the conventional equations of heat transfer are obtained similar expressions those that described the thermal behavior of dry transformer with air core. The modeling is extended to analyze of the voltage behavior. A comparison between the theoretical and experimental results in a MRI system in working is showed. A high correspondence between both (theoretical and experimental) is demonstrated with the value of χ 2 = 0.37. The equation of voltage behavior is applied for different conditions of work varying the current (χ 2 = 0.01 y χ 2 = 1.67) and the initial temperature. In all cases the results confirm that the model is valid to describe the temporal behavior of voltage and the temperature of a resistive magnet.
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