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Translated by AltaVista,
June 14, 2004. Posted here for historic archive purposes.
version 1.2 ... or how to produce electricity and light starting from a hot water cup...
Modifications made to version 1.1: the principal changes consist of the use of 4 miniature ball bearings, the fixing of 4 permanent magnets to the periphery of the wheel, the assembly of 4 reels intended to feed in electric power the 2 leds with weak current. Complementary supplies: - 4 bearings with
flange Ø 1.5 X Ø 4 which one can order at SORB
(réf.: F681X) Principle:
the principle is that of the "dynamo" of bicycle, which bears its name badly, since it is acted in fact of a small alternator: each time one of the magnets approaches the reels, it generates an electromotive force there - when the magnet moves away, it creates an electromotive force of opposite direction. The adaptation was possible, for the moment, only on this model, because it is the only one to combine at the same time a power and a number of revolutions sufficient: 15 MW with approximately 500 rpm on an ebullient water cup - (mechanical power converted for which it is necessary to cut off the losses due to frictions - diagram p,V opposite). To use two alternations of the current, the leds are assembled head-digs: one ignites when the tension is positive and the other when it becomes negative, retinal persistence making the remainder... In practice the leds start to radiate starting from 250 rpm, that is to say a linear velocity of 1.5 m/s, and produce the maximum of light a little beyond 500 rpm - on a hot water cup, they shine during about thirty minutes. Some first (and bad) images of this evolution of the simplified Stirling engine
See also
Page posted by Sterling
D. Allan, June 14, 2004 |
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