GENERATOR- YOU DO THE IN/OUT POWER MATH

[Bruce_TPU]

Hi Bruce.

I'm not comparing AC to DC, i am rectifying - see 2nd and 3rd lines of my previous post.

*EDIT* But i know what you mean about duty-cycle, i saw that when i put a load on mine. *EDIT*

My bearings arrived this afternoon so am remounting the whole thing tomorrow, along with the extra coil

Reading these was interesting :

http://davidsonsales.com/docs_pdf/CoilPitch.pdf

http://www.bmcoi.com/CatLit/Power/TECHNICAL%20PAPERS/GEN.%20WINDING%20PITCH%20-%20LEKX3115.PDF


Gary.

Hi Gary,

I went back and looked and still can not find the post where you state that you rectify the output.

Also, the .125 ma, was that with the analog meter or DVM?  Are you sure it was not set to micro amps, if an analog meter? 

Thanks and keep on pluggin' away, it is how we learn,

Bruce

[DeepCut]

Hi Bruce,

The post where i mention rectification is on here :

http://www.overunity.com/index.php?topic=9076.msg238384#msg238384

Both measurements taking using the analogue meter because i (stupidly) hadn't pushed the lead into my digi one correctly and thought that it couldn't read mA ...

And, yes, i know the difference between mili/micro/pico/nano ... ;+}

*EDIT Anyway, today i'm setting it up more properly because now i have my bearings, so all easurements will be taken again with the new setup, including the additional winding. *EDIT*


Gary.

[Bruce_TPU]

Hi Bruce,

The post where i mention rectification is on here :

http://www.overunity.com/index.php?topic=9076.msg238384#msg238384

Both measurements taking using the analogue meter because i (stupidly) hadn't pushed the lead into my digi one correctly and thought that it couldn't read mA ...

And, yes, i know the difference between mili/micro/pico/nano ... ;+}

*EDIT Anyway, today i'm setting it up more properly because now i have my bearings, so all easurements will be taken again with the new setup, including the additional winding. *EDIT*


Gary.

Hi Gary,

Okay, I am feeling a little more optimistic.  The additional winding will for sure help, and hope that you use stranded pickup wire for it.

Did you build your own rectifier, or use a radio shack or equiv one?  The reason that I ask, is that the ready bought rectifiers do not switch very fast, and you may be better off making your own out of some inexpensive germaniums. 

What kind of non magnetic bearings did you get?

Thanks!

Cheers,

Bruce

[DeepCut]

Hi Bruce,

I used this full-wave rectifier, the black square one with four legs in the picture :

http://maplin.co.uk/Module.aspx?ModuleNo=19088

My pickup coil is 0.28mm magnet wire, not stranded.

No bearings in the old setup we are discussin, axle mounted through holes in PV drainpipe so there is friction unfortunately.

But i now have these bearings :

http://www.amazon.co.uk/gp/product/B002SRSUUU/ref=oss_product

They are actually open bearings unlike the picture, so i can lubricate them easily.

They are meant to be outside diameter 19mm, but i made a hole with my 19mm router bit and there is about 0.25mm of space

So i have mounted them in 19mm plastic waste pipe.

Bearings mounted on 6mm carbon-rod shaft.

The work isn't master craftmanship since i know as much about DIY as i do about electronics !

I will also order this PWM kit when it is back in stock, which can run on 9V batteries :

http://cpc.farnell.com/1/1/47000-dc-pulse-width-k8004-velleman-kit.html

So stranded wire is more effective for induction ?

What gauge should the strands be etc ... ?

Here is a picture of the setup so far :

http://qvision.pwp.blueyonder.co.uk/GEM4.JPG

Thanks,

Gary

[mscoffman]

There's still something wrong with the math. Do you have the 10K pot set to
10K ohm's or 0K ohms? And are you measuring the voltage and current at the same
time? E=I*R says that 33.6 volts at .125amps (not ma) is only about 268ohms
load. So these numbers are too far off for a 10Kohm load.  Note .125amps = 125.ma
.125ma = .00125amps. Your motor's numbers are really very good if true and
E and I are measured simultaneously.

If you could measure the voltage with DVM and current with the mechanical
meter simultaneously through a fixed 10Kohm load resister cc: brown black orange
and then again through a 4.7Kohm resister cc: yellow violet red. It might be helpful.
10K seems much too high to be the effective impedance of the output coils.
The calculated P should go *up* with the 4.7K ohms resister in my opinion.
Note if the rotor RPM changes with more load.

The other thing you could try if you have any kind of a toroid core handy is
wind a pulse transformer with 33 turns on the primary and 13 turns on the
secondary and see if you can get the 33.6 Vac pulses stepped down to
approximately 12.5 Vac then rectify it.  Current through the right resister
should then be .25amps Maybe with 26gauge wire. Use plastic insulated
hookup wire if you don't have lacquer coated wire. One may need a series resister
to keep the primary from shorting the output coils.  This would make your
output voltage close to your motors input voltage. hint,hint. 

:S:MarkSCoffman