excellent Ben - sounds like you've put that one to bed!

i figured i was going to be on a loser with coil repeatability due to manual winding, so i'm hoping i can compensate by adjusting the core gap on each coil separately (as well as being able to adjust the whole stator plate to rotor gap independently)

any possibility of you having the same opportunity for adjustment?

in any case, i think the worst outcome will likely be a slightly greater 'ripple' on the input side to the smoothing cap - i don't think the following has been discussed so far, but there shouldn't be any problem feeding the combined FWBR o/p thro' a suitable inductor to the buffer cap - an 'inverted-L'  filter could help reduce this sort of 'imbalance'

the effect may not even be a problem due to the inertia in the rotor and the energy stored in the  buffer cap

i'd recommend some kind of test before investing too much time & effort  trying to ensure consistency in all the coils (a whole lot of work!)

just a thought - could the higher-than-rotor resonance be related to the number of mags or cores in your current platform?

hope you get to have a fruitful weekend

all the best
np

LOL - i just KNEW neptune would pick up on the 'truckin'!!! 


http://docsfreelunch.blogspot.com

@energia9 . If I am understanding exactly what you are saying . You have 2 identical small electric motors  .These appear to be the brushless type , with a 3 pole stator . Can you tell us the type and origin of these motors? So you take one motor , and powering it with a 9 volt battery you add 2 neo magnets to the outside casing . Having found the sweet spots and glued on the magnets , you now use it as the generator . you drive it via shaft coupling with an identical motor [on 9 volts ?] . The output from the generator is 3 times the power needed to supply the drive motor . This constitutes overunity by a factor of 3 . How did you measure power [ amps times volts = watts ?]Did you try looping ? Did you put a load on the generator ?  Your replies to my questions would be much appreciated .

Edit looks like this motor may be a brush type ? Are the motor windings standard or moditied , Did you make the hole in your thumb removing the end cap?

Quote from: neptune on June 17, 2011, 01:27:43 PM
@energia9 . If I am understanding exactly what you are saying . You have 2 identical small electric motors  .These appear to be the brushless type , with a 3 pole stator . Can you tell us the type and origin of these motors? So you take one motor , and powering it with a 9 volt battery you add 2 neo magnets to the outside casing . Having found the sweet spots and glued on the magnets , you now use it as the generator . you drive it via shaft coupling with an identical motor [on 9 volts ?] . The output from the generator is 3 times the power needed to supply the drive motor . This constitutes overunity by a factor of 3 . How did you measure power [ amps times volts = watts ?]Did you try looping ? Did you put a load on the generator ?  Your replies to my questions would be much appreciated .

Edit looks like this motor may be a brush type ? Are the motor windings standard or moditied , Did you make the hole in your thumb removing the end cap?

just wait till i redo the experiments again, you can try it too- i suggest you to!!, it is a great way to understand things.. i believe these small motors are very efficient and it should be much easier to make them selfrun if you rewind them.. , (more output coils)
this motor is a brushless motor!

@energia9 . Thanks for reply . Before anyone can try this we need more information . Where did you get these motors from . Normally a brushless motor has a built in circuit board . When you use the motor as a generator , do you keep this board connected or do you have some other output circuit ?  Will you confirm that you are claiming that you get more watts out than you are putting in please ?

Quote from: Scorch on June 16, 2011, 08:07:03 PM
Hey everybody. Finally decided to acquire a real (but cheap) variable DC power supply for my lab.
Thought you might be interested to know about an Asian built 30vdc, 5amp, power supply with fine tuning, LED display, and test leads for only $80.

It's an Atten Brand model APS3005S currently available through Amazon at: http://amzn.com/B0050FBSRY

It brags of low ripple and noise and the China manufacture's page says it has a "Strong Wind" (Forced Air) cooling system.
And I think LED displays look cool compared to common LCD displays.

Not a bad deal for $79.99 and free shipping.
Most other 30v, 5a, supplies are $100 or more.

}:>

Scorch,   nice looking DC supply.  Good price.   I ordered one for my little lab. 

Bill