Mikhail Dmitriyev - Input 1000 W, Output near 3000 W.

[soundiceuk]

Hi Paul,

I too have no paypal account and would like to make a donation.

Would a U.S. postal money order work? If so where to send it?

Nice looking family. Wish you all well.

regards, Gene

Hi Gene, could do bank transfer or paypal even with no paypal account.

I found this about U.S postal money order.

US Money orders in UK - Web Hosting Talk

So it seems it is totally possible, but there is a charge for the conversion.

Be glad to have more folks on board.

Best regards,

Paul

[purelyprimitives]

Hmmmm. This thread has been pretty quiet? Where is everybody?

I'm playing with a new idea that will reduce the required catches down to only one per weight! This might be considered heresy but I'm departing slightly from his design and resorting to a more conventional overbalanced wheel that will rotate the weights only 90 degrees instead of the full 360. I'll keep you posted on my progress......

[soundiceuk]

Update 11th November 2012

Hi everyone, there are two more videos in the Replication 1 folder.

Stage 5 & Stage 6 (check back for 6 if reading this at the time I wrote it).

https://www.dropbox.com/sh/ikrznic8j9omlgu/OGof5XoUVV?m

Mikhail's prototype 11 uses 6 kg per deflecting element.

The diameter of the wheel is 1.3m.


Using the torque calculator Torque Calculators - Torque, Force, Distance

6kg x 0.65m = 38.2459 Nm


Replication 1 uses .45kg per deflecting element.

The diameter of the wheel is 1.2m

Using the torque calculator Torque Calculators - Torque, Force, Distance

0.45kg x 0.6m = 2.64780 Nm


The denim was used on the deflecting wheel to prevent the foam getting damaged, unfortunately it is a little too slippy.

I believe bike inner tube is going to be tested instead.

My conclusion is that the alternators were shorted which is a heavy load, there wasn't enough torque to sustain the torque required by the heavy load.

It increased the slip on the deflecting wheel because the wheel was decelerating.

What does anybody else think?

[purelyprimitives]

Clearly he needs heavier weights to drive the PMA and inner tube should work much better. I couldn't really tell from the video but is he still pushing the weights in at 7:00?

[purelyprimitives]

OK finally caught video 6 and see that he is not pushing the weights in at 7:00. I feel so bad for this guy. I appreciate the fact that he shows all the things that didn't work. The one way bearings are definitely crap and clearly NOT the way to go. The same with the nylon deflectors. I'm eliminating both on mine and his video shows me I'm correct to do so.

[purelyprimitives]

One more thing...is he feeding voltage to the PMA to drive the main wheel? It doesn't seem like it. Without narration its hard to tell whether the power supply is driving the small wheel motor or the PMA or both???

[i_ron]

One more thing...is he feeding voltage to the PMA to drive the main wheel? It doesn't seem like it. Without narration its hard to tell whether the power supply is driving the small wheel motor or the PMA or both???

It seems to me that he is only driving the kicker wheel from the supply. Whereas he is using a full short on the alternator, perhaps a load resistor would be more appropriate? But yes, the wheel suffers from poor one ways and lack of weight.

Ron

[soundiceuk]

In both Stage 5 & Stage 6 videos the dodgy one way bearings have been replaced.

PLEASE NOTE: All one way bearings have a maximum torque before slippage.


At the end of the Stage 6 video he has removed the chain and purposely drives the wheel too fast to see what happens.

This is the main reason the weights get tangled.


I think the problem with the nylon all thread is the flexibility.

I think the flexible nylon all thread creates more drag than a solid nylon rod.

Notice Mikhail is using solid nylon with much heavier weight.

The air inside the bike tyre may help to give a better cushion and deflection too.


Only the kicker wheel is being driven by the supply.

The PMA is connected to the DMM and the yellow jump lead is for shorting.

I have also suggested using a load resistor to get some readings.

Any suggestions on load resistors suitable?


The wheel is 1.2m, 3/4" birch plywood. The bearings are 14mm OD, 8mm ID, 12mm length.


The replicator said this about Stage 6 video:

"The last part of the video I was showing what happens when you run the wheel too fast. Its all about the torque."

[i_ron]

Isnip

I have also suggested using a load resistor to get some readings.

Any suggestions on load resistors suitable?
snip

."[/B][/I]

Paul,

If he has 9 volts DC from the 3 phase alternator then a load resistor of about 10 ohms would give him about 9 watts output (for unity input versus output)

However he should calculate his wheel RPM to get the gearing ratio as he only needs 130 RPM on the alternator for 12 volts output.

Hope I have this right?

Ron

[purelyprimitives]

In both Stage 5 & Stage 6 videos the dodgy one way bearings have been replaced.

PLEASE NOTE: All one way bearings have a maximum torque before slippage.

Replaced before or after the videos were shot? Kinda makes you wonder how Mikhail got his to work so well given the mass of his weights?

At the end of the Stage 6 video he has removed the chain and purposely drives the wheel too fast to see what happens.

This is the main reason the weights get tangled.

Speed and bearing slippage I'm guessing. This seems like the only major drawback to his design. Which is fine if you design it to run at a fixed speed but it seems to severly limit your output options.

[soundiceuk]

Paul,

If he has 9 volts DC from the 3 phase alternator then a load resistor of about 10 ohms would give him about 9 watts output (for unity input versus output)

However he should calculate his wheel RPM to get the gearing ratio as he only needs 130 RPM on the alternator for 12 volts output.

Hope I have this right?

Ron

I'll get back to you on this one Ron.

[soundiceuk]

Replaced before or after the videos were shot? Kinda makes you wonder how Mikhail got his to work so well given the mass of his weights?



Speed and bearing slippage I'm guessing. This seems like the only major drawback to his design. Which is fine if you design it to run at a fixed speed but it seems to severly limit your output options.

The other brand one way bearings were replaced before shooting Stage 5 & Stage 6 videos.

There are actually two x 14mm OD, 8mm ID, 12mm length one way bearings per deflecting element.

The bearings the replicator is using cost $2.86 USD

HF081412 One Way Miniature Needle Bearing/Clutch,8x14x12mm


I have tracked down the manufacturer of the bearings Mikhail is using:

Schaeffler Technologies (INA): Ball bearings, Combined axial/radial bearings, Driven linear units


As the bearings are pressed into the 3/4" birch plywood by hand I have suggested marking the bearings and wood with permanent marker to monitor for slippage.

[woopy]

Hi all
I think it is a very good video and Replicator 1 is doing the right work.

His progress are impressive, and now he will have to diminish the generator breaking under load with a kind of resistor, until he get the right power balance, and see if the power input of his kicking motor can be balanced and / or beaten by the gen output power.
To me the kicking motor seems to be a standard brushed allaround motor, for sure a direct drive brushless should improve a lot .But the basic system is very OK for what he is looking for at the present, i mean to get the feeling of the machine in his hands.

And as per what Mikhail showed to us , we are looking for a 3 to 1 power ratio, so those friction and not top quality product , should anyway be able to approach a 100 % efficiency.

Now for the 7 o'clock lifting, i go on thinking that it could be perhaps an addendum advantage when the wheel works without it (taking advantage of eventual oscillation of the weights at arround this 6 o'clock position to maintain them up ) . But when i see the video of Replicator 1 , trying to hardly lift those weights with a cascade of braking wheels, i have some big doubt of the usefullnes of this system yet.

Remember that IMHO , i think very strongly that if this kind of wheel could work ,it is not due to single overbalanced weight but to a compostion of unbalance and swinging .
OK but this is my thinking, and i can be totally wrong.

I just add that ,this is also my my hands feeling experience , because each time i tried this kind of mecanical or magnetic config (7 o'clok lifting ) on my bench testing machines i got the exact same result as Replicator 1 , i mean as far as i know , desapointing results.
Sorry to report this testimonial

But again, i can be wrong and perhaps some of you could overcome the problem , and as i also think that, there are never problem but only solutions please feel free to test and report.

Anyway Replicator 1 is the more advanced so far on to Mikhail's replication and i am very thankng him for his sharing and i am encouraging him to go on his excellent work.

good luck at all

Laurent

[soundiceuk]

Replicator 1 just said:

"Sorry, I forgot to mention this, but the shafts I'm using are 5/16, and the bearings are 8mm. Thats why some were slipping. Only way to get shafts at 8mm diameter is to order them online. I'm looking into that, although they are working pretty well for being just a hair smaller."

Any of you USA guys know of any decent metric steel rod suppliers?

[drak]

Remember that IMHO , i think very strongly that if this kind of wheel could work ,it is not due to single overbalanced weight but to a compostion of unbalance and swinging .
OK but this is my thinking, and i can be totally wrong.

I think you are correct, I think it is in the momentum of the weight as it is flying by the kicker wheel and gets a kick even harder in that direction throwing it further out.