My concern I am writing about is with a small generator not producing current or being able to be loaded. First I'll describe the product. I bought a couple mini brushless 3-phase generators (motors). They have a delta wire outlay I assume since they only have 3 wires coming out. They are rated at an Output voltage of : 3V-24V; Output current of : 0.1A-1A; Rated speed of : 300-6000 rev/min; and Rated power : 0.5-12W. The 3 phase motor consists of 9 coils and 12 magnets on the outside. Here is a link to the product.
I wanted DC so I built a 6 diode bridge rectifier to turn the ac into dc, I even bought schottky diodes which supposedly have lower forward voltage. Currently with my drill I can only spin the thing to 900rpm. I know that's on the low end, but out of the diode rectifier I still read 10 volts dc. So I have a working voltage. The problem arrives with the amperage. I could barely get a 5 watt bulb to barely start to turn on to a faint orange glow. Now I have tried generating with a brushed dynamo, if I dont spin it fast enough I don't get the voltage. But! form 0rpms and 0 volts I can feel the load when I try to turn it and it resists.
With this small brushless generators, I was not sure if the load was too small to feel so I over loaded one of them with a 30 watt bulb. I then tried turning the generator with my fingers to see if I could detect a small resistance (given that the generator and rated output is small) but I feel no "load" on the generator, then I proceeded to spin the thing at 900 rpm's with the drill and the voltage with the load connected would not surpass .2 volts and 0.02 amps. I never encountered this type of problem with a small dynamo.
So I can't tell if I don't understand how to work with a 3 phase motor. I know my diode bridge is connected correctly. yet I can't get the little thing to turn on a small 5w bulb, or even to burn the windings by over loading it. not a touch of heat. I know my connections are good because i read the voltage throughout the system. Would anyone have a clue as to why I might not be able to "load" my small generator? I tried 2 of them so its not a faulty singular unit. Any advice would be appreciated, and I apologize for how confusing the whole thing seems, I am trying to make sense of it the best i can myself.