Hi all.
Quote "--Latest replication video-- http://www.krystyna.nl/Machine/RPM_test.wmv"
Nah nothing 'latest or replication' about it, that video is like over 2 years old.

Its the same gen (other vid though) I showed some time ago and what you see is the solid steel hc device running them 50watt bulb.
Well I saw you text "Rotor Speed Critical Minimum Velocity" and I though hey I saw that effect as well back then.
So I decided to put up the vid. Didn't try to prove any point here.

Hmm well if a core from a 1200watt mot saturates at 50watt use then something is not right.

Anyway the vid will be removed in a few days because the last time I posted a vid I had complains about bandwidth limit being exceeded and such.
Regards,
Steven

Quote from: Kator01 on October 27, 2008, 08:50:36 AM
Hi i_ron,

what did you do ? Can you show a simple hand-drawing of your transformer-setup and describe your findings ?
Measurements ? Is this a microwave-oven-transformer you have shown in your picture ?

I have done some tests with a flyback-transformer using 20 turns for a double-string primary-coil and about 800 turns for the secondary. First tests with a rectangular waveform have not been very successful . Now I will develop a sinus-waveform-oscillator for the range 5 KHz to 30 KHz for further tests.

Regards

Kator

Kator,

Yes, it is a trusty old mot. I used the original primary as a secondary. I wound a new bifilar primary.

This was line driven, that is 120 volt 60 Hz to the variac and 20...70 volts to the DUT (transformer)

The capacitors were 20 mfd in this experiment although this is the second primary. The first one
had fewer turns and larger gauge wire. I used up to 48 mfd for each side on that model.

Interesting in its behavior... in that at some point it will 'jump' and start flowing high amps.

Input, 20 watt.........output, 12.8 watt....eff, 64%

Input, 58 watt.........output, 28 watt..... eff, 48%

Jump

Input, 206 watt.......output, 55 watt......ef, 26%

So you can see, I was not to impressed.

Ron

Quote from: Nali2001 on October 27, 2008, 09:11:34 PM
Hi all.
Quote "--Latest replication video-- http://www.krystyna.nl/Machine/RPM_test.wmv"

Well I saw you text "Rotor Speed Critical Minimum Velocity" and I though hey I saw that effect as well back then. So I decided to put up the vid. Didn't try to prove any point here.

Regards,
Steven

THE POINT IS ...
YOU MENTIONED NEAR THE BEGINNING OF THIS THREAD THAT WHEN YOU REPLACED THE
SOLID IRON CORES WITH LAMINATED ONES THE ACCELERATION DISAPPEARS.

THE POINT IS - IT DOES NOT DISAPPEAR...

Thane

Quote
« Reply #48 on: February 06, 2008, 02:11:00 PM »

"But the main problem is that these bad cores don?t seem to be able to give a bigger output then the losses they have. So the solid steel cores were replaced with good silicon steel laminations, but you guessed it, the accelerating effect is now gone.

So you can kinda say it like this. If you have a core with lots of core losses, Lenz will fight them and cause less drag on the rotor under speed (but only up to a balance between the two) but due to the bad core you can forget any o.u potential. So you say let?s use good cores then, like silicon steel or metglass? well you now have the potential of real good output? but unfortunately the no load effect is now gone. So again nature has found a way to put ?it? just out of our reach.

Regards,
Steven

Quote from: Kator01 on October 27, 2008, 08:50:36 AM
Hi i_ron,

what did you do ? Can you show a simple hand-drawing of your transformer-setup and describe your findings ?
Measurements ? Is this a microwave-oven-transformer you have shown in your picture ?

I have done some tests with a flyback-transformer using 20 turns for a double-string primary-coil and about 800 turns for the secondary. First tests with a rectangular waveform have not been very successful . Now I will develop a sinus-waveform-oscillator for the range 5 KHz to 30 KHz for further tests.

Regards

Kator

Kator,

With Mr T's kind permission as this patent was a suggested driver for the T transformer....

here is a better pic showing more of the test setup... if anyone has a solution for where I went wrong?

Ron

Quote from: i_ron on October 27, 2008, 09:47:32 PM

here is a better pic showing more of the test setup... if anyone has a solution for where I went wrong?

Ron

NO BEER FRIDGE!

GNIGHT ALL
T