DC generator problem...HELP!

[Moha99]

Hallo!


I have this small 12 Volt/DC motor I'd like to use as a generator. I've managed to generate 6 - 7 volts/dc max when I tested it, I wanted to plug that dc output from the 12 volt dc motor to another DC/motor or a rechargeable battery. What happens is the motor does not power anything I don't know why... Even when I'm trying to power DC appliances I can hear a strange sound coming from the DC/Generator(12 Volt motor) it's slowing down but not stopping it's as if something is holding it or the charge is not going through anything...
I don't know what to do I need to use that motor as a generator can someone please help me with this issue!


Here some additional information about the motor:

12 Volt/DC brush-less motor.
It generated under high RPM'S 12 to 13.5 volt's AC - 6 to 7.3 Volts/Dc


Heres a few images of how it looks like:

http://www.google.com/imgres?um=1&h...&w=400&h=300&ei=pX_sTvfRIOn44QTKr6m2Cg&zoom=1


And another photo:



http://www.google.com/imgres?um=1&h...&w=366&h=402&ei=x3_sTrOuH-mG4gTcwtWXCQ&zoom=1

Thanks.

 

[jackorocko]

That thing looks tiny, exactly what are you using to turn this thing over?

 

[Moha99]

That thing looks tiny, exactly what are you using to turn this thing over?

another motor is running it. A 12 volt motor.

It is really small Im using simple things as project test then go for expensive motors/generators.

Thanks

 

[davelectronic]

These little motors have very small outputs as small generators, you really need something bigger, but having said that, there is nothing to be gained from powering one motors shaft, generate power to turn another motor over or run it, charging is different, but only if your generator has some kind of efficiency, one motor powering another is poor efficiency, wind, water hydro solar to power your motor = efficiency and free power.

 

[Laplace]

Since this is a brushless motor the first question would be whether the commutation controller is internal or external. If internal then it can't be used as a generator, and trying to do so may result in the back EMF frying the internal controller. If the controller is external, then you should have external connections to the multi-phase stator windings. Is the stator wired in a delta or wye configuration? I don't have any experience with brushless motors, but logic tells me you have a multi-phase AC generator there. How are you converting the AC to DC?

 

[Moha99]

These little motors have very small outputs as small generators, you really need something bigger, but having said that, there is nothing to be gained from powering one motors shaft, generate power to turn another motor over or run it, charging is different, but only if your generator has some kind of efficiency, one motor powering another is poor efficiency, wind, water hydro solar to power your motor = efficiency and free power.

I'm looking for a permanent magnet DC motor between 9 volts to 12 volts alot bigger than this hope it works.

Since this is a brushless motor the first question would be whether the commutation controller is internal or external. If internal then it can't be used as a generator, and trying to do so may result in the back EMF frying the internal controller. If the controller is external, then you should have external connections to the multi-phase stator windings. Is the stator wired in a delta or wye configuration? I don't have any experience with brushless motors, but logic tells me you have a multi-phase AC generator there. How are you converting the AC to DC?

Sorry but I didn't understand you much... Forgive me but I lack alot of things I'm a new beginner in this field of electric generation.

But could you clear out what you said? And how can I avoid the EMF problem.... Thanks.

 

[davelectronic]

Hi again, i think Laplace thinks your using three phase, the wiring Delta / Wye are three phase wiring configurations, EMF is electro magnetic force i think.

 

[jackorocko]

Any good PMA will produce three phase as it is more efficient. I didn't know small dc brushless motors had multi-phases, but it makes sense, seeing as how they would be smoother in operation and provide more torque.

 

[davelectronic]

Oh ok i get it now, my mistake, i thought the driving motor was a three phase AC model, not the generater, so the generated power is three phase, but small scale.