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Registered Member #1749
Joined: Fri Oct 10 2008, 02:04AM
Location: Claremont New Hampshire
Posts: 497
Can I make my three phase generator in to a single phase generator with no rectifier? I did allot of searching on Google and here and found nothing my plan is to make a small four stroke engine run off of hydrogen for a generator and use a portion of the power for the electrolysis. Oh I did find a way with a transformer having a center taped primary and single wind secondary.
Registered Member #1806
Joined: Sun Nov 09 2008, 04:58AM
Location: USA
Posts: 136
The only way I know of (given your constraints) is to just use one of the three phases as your single phase output. It can probably produce a bit over 1/3 of the total output from that single phase (because the other two are not dissipating heat)
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
Unless the laws of physics have changed recently, even if you use ALL of the alternator power for electrolysis it will not be enough to run the motor continuously. Why not use a three-phase rectifier to produce the DC for electrolysis?
As above, just use any two of the three 'phase' wires for single-phase ac output - if required.
Registered Member #2463
Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
A three phase rectifier will yield the most DC power for electrolysis, but should be rewound to match the voltage/current requirements of the gas cell.
Hugh homopolar dynamos were used for electrolysis at about 8 volts and the use of 6 volt auto generators were popular with home electroplaters once.
Registered Member #1749
Joined: Fri Oct 10 2008, 02:04AM
Location: Claremont New Hampshire
Posts: 497
It is a brush less motor from a big copier and it puts out 13A 26V @ 1200RPM when it is shorted across the shunt resistor it takes allot to turn which is good right meaning it does not waist to much? It is allot smaller than an alternator. Oh that is only two out of the three wires.
Registered Member #2463
Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
Your motor data : When you turn it at 2600 RPM, with no load attached, What is the voltage across three pairs of terminals; t1-t2, t2-t3,t3-t1. When you have that voltage, (and frequency if you can get it) Connect a variable load across all 3 pairs, (3 resistors) and adjust the resistance until the open circuit voltage drops by 50%.
Now calculate the total power in the load for the maximum resistance load power your motor/generator will produce.
If you short it out and turn the shaft by applying a heavy torque, you could demagnetize the rotor, if it turns out to be a hight torque stepper motor. You might find this out by applying a light load and turning the shaft to feel how many cog steps it makes in a revolution.
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Three phase AC power.
