Are Tommey Reed´s pulse motor circuits overunity ?

[chrisC]

Well, yes, in the last video with some real load like the hotgun dryer,

Tommey is now using the BackEMF to run directly the heatgun.

It seems to have just
only  66 % efficiency
from the test, where he used 50 Volts on the cap bank at the end of the movie.
So no overunity.
Would be interesting to see, how the efficiency will be, if he will drive with the BackEMF the motor/generator combination and hook the heatgun to the generator output.

http://www.youtube.com/watch?v=zqtRjudNTSg

Well, some people just point out over here the errors some inventors make
and some of their measurement errors.
This is a free speech forum about these topics
and when inventors make measurement errors,
they have to be pointed out.

So this is also a way to help the inventor to make
his circuits better.

It has nothing to do with pushing the inventors away from this forum.

Inventors should have more self confidence and should defend themself better
when they think they are right and also should admit, that they have done
errors, when somebody else points them out and the inventor will see the error then
by himself.
We all make errors.
So there is no problem to accept this.
But it has to be pointed out and agreed on it, so we
know which measurements are right or wrong.
Otherwise we will never make any progress.

Just think about this.

Regards. Stefan.

@Stefan:

I think what he was showing in that video you referenced is that at 50% duty cycle of the PWM, the efficiency drops to 66%.

But if the duty cycle was 33%, at 50V at the capacitor, (ie half of the battery voltage), he maintains it's still way OU. Or did I misunderstand?

One of Tommey's problems id he has too many videos. IMO, he just need to do a couple of videos, one just showing the back emf coil & circuit (which he has done) with measurements and then another video just driving the hairdryer with the back emf & capacitor bank & DC batteries, all connected with meters where he does not switch between them. Then we can all see which meter is showing what results!

cheers
chrisC

[hartiberlin]

Hi ChrisC,
In the first 4 minutes of this video,
the efficiency is about 73 % only.

The test at around minute 5 is around 68 %.

At minute 8 he is  only at about 60 % efficiency when he cranked the BACKEMF to 121.5 Volts DC.


( all assumed that the supply battery voltage under load was 96 Volts, he did not show this unfortunately,
if it dropped the efficiency is a bit better)

[chrisC]

Hi ChrisC,
In the first 4 minutes of this video,
the efficiency is about 73 % only.

The test at around minute 5 is around 68 %.

At minute 8 he is  only at about 60 % efficiency when he cranked the BACKEMF to 121.5 Volts DC.


( all assumed that the supply battery voltage under load was 96 Volts, he did not show this unfortunately,
if it dropped the efficiency is a bit better)

Stefan:

I watched it again and here's what I think he's saying.

At around 6.30 into the video he's giving us a current measurement of 4.48A consumed at the back emf output (hair dryer) and a input current measured at the battery or filtered caps. of 3.57 A - both the voltages are normalized to around 50V (input and output). So, this is O.U

He then added that to drive the back emf harder using > 33% or so duty cycle and hence cranking the voltage higher is possible but will result in lower efficiency because of the > 33% duty cycle of the PWM because the energy is not used by the back emf but gets dumped to ground.

Well, all I can say is to wait for Tom to engineer his loop and to see if the total OU gain is able to complete the loop minus total loss. Only time will tell.

cheers
chrisC

[hartiberlin]

Stefan:

I watched it again and here's what I think he's saying.

At around 6.30 into the video he's giving us a current measurement of 4.48A consumed at the back emf output (hair dryer) and a input current measured at the battery or filtered caps. of 3.57 A - both the voltages are normalized to around 50V (input and output). So, this is O.U

Where did he say, he is using only 50 Volts of battery voltage ?
To my understanding he wanted to have half of the battery voltage at the output,
so I guess he still used his full 96 Volts from all the batteries in Series.

Too bad, it seems he has again deleted all his videos.
So we can no longer have a closer look at them.
Regards, Stefan.

[nyctuber]

New vid