Yesterday I've bought a 4 kW 3 ph. electric motor from a scrapeyard (it costs me 100 USD). I had beginner's luck. After half a day of tests (and a blowed fuse) I succeed to put the motor into resonance, i.e. almost zero Amp under load. Monday I'll buy all the motors left from the scrapeyard. There are at least 5 similar to the one I've bought. I intend to make pairs of them (motor+generator). In my configuration I use only 2 x 10 uF capacitors as start&run capacitors (old russians ones). When connected to the grid (220 V in my country) the amperage drops from 4.5 amps to 0.7 amp (2850 rot/min - as labeled). If I disconnect the two capacitors, the amperage drops to 0.2 - 0.3 Amp (2.990 rot/min). But when I apply a load, without capacitors the amperage rise till 1.2 Amps. The most astonishing thing happens when I left the 2 start capacitors connected (i.e. became run capacitors). When idle I have 0.7 Amp, but if I apply a load, the amperage drops till 0.0 Amps (my ammeter is not very accurate being a cheap one, to register under 100 mA) . When I increase progressively the load, the amperage start to rise till 4.2 Amps when motor stops. The next step will be to coupling an identical motor as generator and see what's happened. Another thing that I intend to make is to use a solar panel array to feed the rotoverter. Now I have 3 x 100 W solar panels and a 300 W inverter. Unfortunately the start surge of current is of 4.5 Amps (4.5 A x 220 V = 990 W) and I was unable to run the motor on solar panel. But I'll buy a 1000 W inverter to see what's happened. Those tests could be seen on youtube: https://www.youtube.com/watch?v=G6kEmXc9JVU
I know it seems to good to be true, but it is a simple setup (an electric motor and two capacitors), everyone could try.
I know it seems to good to be true, but it is a simple setup (an electric motor and two capacitors), everyone could try.
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