Jamie’s Brick Jams determined to take an outdated Nikola Tesla concept and switch it into one thing utterly new, using LEGO components to assemble a working generator. Jamie determined to make the most of stacked discs moderately than the usual spinning blades. Air enters at an angle by way of small holes and spirals in in direction of the intently spaced surfaces, and the friction from the shifting air is what causes the discs to spin, with out the necessity for any direct pushing drive.
His first makes an attempt employed fundamental LEGO Technic wheels and beams to assemble a fundamental rotor stack, however compressed air at sixty kilos per sq. inch was inadequate, because the meeting was solely spinning at eighteen thousand revs per minute and lacked thrust. It was speedy, but it struggled to maneuver just a little strolling robotic, not to mention large objects. Then Jamie had the intense concept to make use of printed discs. The skinny little circles that got here out of the 3D printer at one millimeter thick have been an enormous sport changer. Eleven of them stacked on a central shaft elevated the floor space and supplied all the contraption an enormous pace enhance, by greater than 70%. The airflow improved dramatically, and the rotor grew to become fairly regular.
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Subsequent got here the enclosure, which Jamie designed to regulate the coming into air in order that it flowed completely over every disc. Printed housings had eight small holes spaced equally across the outdoors edge, and LEGO bricks sealed the sides to keep up air flowing easily in and stop leaks. The end result was a 50% improve in pace and a big discount in vibrations.
Jamie additionally carried out checks to find out which supplies have been the most effective, together with regular PLA, a extra sturdy selection, PETG, polycarbonate, and even versatile TPU. It seems {that a} harder model of PLA is the way in which to go, because it reached 27,000 revolutions per minute on the similar air stress. If you happen to print the discs at a narrower three tenths of a millimeter, you possibly can put extra of them into the stack with out it being too heavy.
The completed design consisted of thirty discs stacked inside a strengthened LEGO Technic body with metallic axles and bearings for max sturdiness. The centrifugal drive of spinning retains the versatile discs flat, and there are exhaust holes close to the middle shaft to evacuate the clear air as soon as it’s completed. Getting the excessive speeds to generate helpful electrical energy was the precise problem. Jamie initially tried a cone pulley system with a rubber belt, nevertheless it didn’t final very lengthy. In order that they moved to metallic gears with a set discount ratio, which made all of the distinction because it allowed them to attain easy energy transmission with out always fidgeting with modifications.
Coils and magnets served because the generator’s electrical core. It was a very intelligent setup, with a twelve-pole stator constituted of actual LEGO bricks that contained coils of 20 gauge wire wrapped in three phases. Ten highly effective neodymium magnets have been used to generate the magnetic discipline on the spinning rotor. Because the rotor spun, it generated a fluctuating magnetic discipline that the stator picked up. Subsequent factor you understand, rectification kicks in and converts that AC to regular DC, prepared for the true world.
On the ultimate runs, pushing the turbine arduous with air at a whopping 85 kilos per sq. inch yielded impressively constant outcomes. Even below a powerful load it held a gradual 13,500 revolutions per minute, and because the stress climbed the output adopted, peaking at thirty volts with occasional bursts of as much as one amp of present. The tip end result was fourteen watts of usable energy, which is sufficient to cost a smartphone or preserve a 100 watt LED panel working at full brightness for hours
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