永磁式線性發電機之數值模擬與實驗分析

A numerical analysis of a permanent magnet linear generator with aligned magnetic fields is conducted in order to determine the influence of some geometric and mechanical parameters on the voltage induced on a surrounding coil. The magnetic flux is generated by means of ring shaped magnets and its variation in time is produced by means of the back and forth motion of the magnets. The electromagnetic fluxes through the coil loops are calculated using the finite elements method. The conducted analysis of the electromagnetic variables is static and the motion of the magnets is simulated assuming a simple harmonic motion. A basic analysis for one single magnet is conducted first in order to study the influence of some parameters on the induced voltage for this simple case. This analysis includes the influence of the gap between the loop and the magnet and also the influence of the position of the loop along the coil axis on the magnetic flux through it. The variation of the magnetic flux along coil axis, which has a more direct effect on the induced voltage, is calculated as well. An analysis of the influence of geometrical parameters on the variation of the magnetic flux along the coil axis is also conduced. The induced voltage in coil is then determined for different characteristics of the simple harmonic motion (amplitude of the motion as well as its frequency). vi The induced voltage for several magnets (up to three) is also covered and the total voltage induced in coil is estimated and presented in a graphical format. The estimated voltage is the open circuit voltage (no load). In order to validate the model an experiment was performed using one or more magnets with the same characteristics of those used in the model, with their magnetic field aligned and moving with harmonic simple motion. The induced voltage in coil is measured by means of an oscilloscope and presented together with the model predictions.

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參考文獻

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永磁式線性發電機之數值模擬與實驗分析

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