GENERATOR- YOU DO THE IN/OUT POWER MATH

[Rapadura]

This last video is nice!

What he is using as DC input source? D cell battery?

I hope Tom use a rectifier soon, and see what DC output he can get. Let's see how many LEDs he can lite continuously with DC output after the rectifier.

Better... Let's see if the DC output after the rectifier can power an exactly equal generator, and the DC output of this second generator can power the first one. Self running is so cool!

[Omnibus]

@mscoffman,

Accurately measuring the power of an AC signal with instrumentation is almost the definition of an impossibility. I don't care who or what is doing it
- I don't trust it.

That's the crux of the matter. If you measure momentary currents and voltages with a good DSO, multiply them and integrate the product over time you'll get very accurate energy values. The slope of that integrated curve is the power. This is how Steorn are doing their power measurements and so far that's the best I've seen in this respect. The signal should be studied as is, avoiding conversions, rectification and so on which are accompanied by inevitable losses distorting the power measurements.

Therefore, on the contrary, I would not trust power measurements of an AC signal with a DVM's.

Of course, once the procedure for correct power measurements is established one has to provide a load for maximum transfer of power from the source, as you explained.

Also, the input power causing the rotor to spin (or in a transformer whatever there is in the secondary coil) should be calculated by subtracting  the Ohmic losses R*I^2 from the momentary I*V. Therefore, for an accurate measurement of the input power (effective input power) it is very important to measure momentary R accurately on the fly, that is, while the device is working, together with measuring momentary I and V. Would be interesting to hear suggestions as to how this can be done.

[DeepCut]

Reading this document :

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

Makes me wonder about the coil-pitch of this setup ...

The angle of the coil sides to the center of the rotor is easily measured, but what about the pole-to-pole angle ?

Is it 180 degrees ?

This document goes into more detail about why this matters :

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


Gary.

[DeepCut]

OK, hope i'm doing this correctly.

Input : 12.56VDC @ 0.130A

Output (rectified) : 33.6VDC @ 0.125A

The output is going through a 10k pot, turned all the way up, in series with the analogue meter.

If i've done this correctly then :

Input : 1.6328W

Output : 4.2W

COP = 2.57

It's RPM is 12,000 !

I've been reading up on generator windings and have some ideas, will post when formulated and tested properly.


Gary.

[e2matrix]

Tom,  I'm no expert here and I'm sure mscoffman knows more than me but it seems if you are going to try for a self runner you'll lose a lot of efficiency with the way he is suggesting.  So I'll suggest a different way and if others see a flaw with my suggestion that's fine as I said I know mscoffman and others here are way more up to speed on this than I am. 
  I'd suggest simply stepping down the voltage from your output with a small transformer that has about 4:1 ratio and then rectifying the output and feeding that to the input - maybe a filter cap on the rectified output too?  At least to me it sounds like it would be a lot less losses that way.