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Author Topic: Working Magnetic Motor on you tube??  (Read 1328716 times)

mikestocks2006

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Re: Working Magnetic Motor on you tube??
« Reply #1530 on: January 22, 2008, 08:25:38 PM »
something new

http://www.youtube.com/watch?v=4hwMZQ-A0NE

Hi martinzurix,

Interesting replication, thx for posting.
He reports a wind down of 22 minutes.
It would be interesting to get wind down time without the "stators", from the same initial rotor rpm.
Thanks

CLaNZeR

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Re: Working Magnetic Motor on you tube??
« Reply #1531 on: January 22, 2008, 08:34:27 PM »
Cannot remember which Video now , but in one of them I demonstrate that the magnets loose interaction at certain RPM's and as the Rotor slows down again they start to interact. I think at about 800 RPM the AGW actually lost it as well.

Did a new Spin up test today and New Correct Stator Magnets do indeed keep up past 1700RPM

http://www.overunity.org.uk/ocpm/CLaNZeRSDropoutTest.wmv

Cheers

Sean.

robbie47

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Re: Working Magnetic Motor on you tube??
« Reply #1532 on: January 22, 2008, 08:35:34 PM »
Here's another of the same setup martinzui pointed out on the previous page, now with one stator:
http://www.youtube.com/watch?v=GPvi2GwTm9Y&feature=related

[Edit] And with 2 stator magnets:
http://www.youtube.com/watch?v=D0Zgi5dIWR4

Omnibus

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Re: Working Magnetic Motor on you tube??
« Reply #1533 on: January 22, 2008, 08:49:35 PM »
@Omnibus
What grade of bearing did u incorporated into your Stators? I recall u stated "R3", Was curious to what the runout is in the "Y" axis with the single bearing as per the Replication specification in your Rep.

Best Regards
Bill
Yes, indeed, the stator bearings are R3 unshielded. Don't understand what you want me to do. If you're curious about the wind down time, it's almost instantaneous. When spinning it by hand it makes 2-3 turns and stops. Let me know if you want me to try something else here.

robbie47

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Re: Working Magnetic Motor on you tube??
« Reply #1534 on: January 22, 2008, 08:49:55 PM »
Did a new Spin up test today and New Correct Stator Magnets do indeed keep up past 1700RPM

http://www.overunity.org.uk/ocpm/CLaNZeRSDropoutTest.wmv

Cheers
Sean.

Nice video again Sean.
Two questions on it:
1) whats this green/blue stuff: chewing gum? For extra weight?
2) Why are you applying the dampers? They are suppose to reduce speed, but you don't want that right now, do you?

robbie47

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Re: Working Magnetic Motor on you tube??
« Reply #1535 on: January 22, 2008, 08:53:38 PM »
Removed, double post

CLaNZeR

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Re: Working Magnetic Motor on you tube??
« Reply #1536 on: January 22, 2008, 09:00:29 PM »
1) whats this green/blue stuff: chewing gum? For extra weight?
2) Why are you applying the dampers? They are suppose to reduce speed, but you don't want that right now, don't you?


Hi Robbie

The Blue Tac is there to bring the weight of the Stator Magnets upto 10g each.
I have started on my final Stators now.

Regards the Dampners, while doing wind down tests I came across this:

NOTE: knock a 0 off the end of each RPM mark so 4500 =450 rpm

(http://www.overunity.org.uk/ocpm/graphdampners1.jpg)

As you can see the Dampners do carry the Rotor for a bit longer before the drop.
So not only do they maybe act as brakes up the up but also on the down.

I was actually shocked to see the difference as I dismissed the dampners a little, but it does look like they do indeed have an effect bigger than I thought.

I am not sure if the Dampners I have used are made out of 6061-T6 but have some 1/2" bars hopefully here tomorrow of the 6061-T6 and will be interesting to compare the difference.

Be interesting too see what the correct Dampners do when they arrive.

Cheers

Sean.


vipond50

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Re: Working Magnetic Motor on you tube??
« Reply #1537 on: January 22, 2008, 09:10:19 PM »
@Omnibus
What grade of bearing did u incorporated into your Stators? I recall u stated "R3", Was curious to what the runout is in the "Y" axis with the single bearing as per the Replication specification in your Rep.

Best Regards
Bill
Yes, indeed, the stator bearings are R3 unshielded. Don't understand what you want me to do. If you're curious about the wind down time, it's almost instantaneous. When spinning it by hand it makes 2-3 turns and stops. Let me know if you want me to try something else here.

Hello
No, No test requests from me, Sounds like the bearings are to loose (wobble). I found this with the R3 bearing. The R3 i believe is a ABEC - 1 grade (the lowest). I am switching to a ABEC - 5 or ABEC - 7. I found these bearings at  for  (Grade 7 -$11.57 each) and (Grade 5 - $6.30 each). From what I have reviewed the bearing that Al incorporated had to have been a 5 or better or else the wobble would be in the order of 0.080". This as U know is an important issue with this device. If to much run out the rotor and Stator (AGW) coupling will degrade very very quickly as U are witnessing currently due to the pitching of the bearing. That said I would recommend to look at a better grade of bearing.

Thanks for the reply
Best Regards
Bill

Omnibus

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Re: Working Magnetic Motor on you tube??
« Reply #1538 on: January 22, 2008, 09:18:30 PM »
@ClaNZeR,

Just to make it clear?the blue curve is the wind down curve with dampers while the red is without, correct? Is the lone stator latched in both cases? Also, is the hitch between 150 and 200 rpm always reproducible?

I should add, I think the effect is greater than the one shown because you have to shift the red curve slightly to the left. The two wind down curves have to start from the same rpm. It?s interesting that the effect (aside from the mentioned hitch) kicks in at about 400rpm which is about the rpm where the acceleration appears in the video.

Keep the good work, mate.

Omnibus

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Re: Working Magnetic Motor on you tube??
« Reply #1539 on: January 22, 2008, 09:22:08 PM »
@Omnibus
What grade of bearing did u incorporated into your Stators? I recall u stated "R3", Was curious to what the runout is in the "Y" axis with the single bearing as per the Replication specification in your Rep.

Best Regards
Bill
Yes, indeed, the stator bearings are R3 unshielded. Don't understand what you want me to do. If you're curious about the wind down time, it's almost instantaneous. When spinning it by hand it makes 2-3 turns and stops. Let me know if you want me to try something else here.

Hello
No, No test requests from me, Sounds like the bearings are to loose (wobble). I found this with the R3 bearing. The R3 i believe is a ABEC - 1 grade (the lowest). I am switching to a ABEC - 5 or ABEC - 7. I found these bearings at  for  (Grade 7 -$11.57 each) and (Grade 5 - $6.30 each). From what I have reviewed the bearing that Al incorporated had to have been a 5 or better or else the wobble would be in the order of 0.080". This as U know is an important issue with this device. If to much run out the rotor and Stator (AGW) coupling will degrade very very quickly as U are witnessing currently due to the pitching of the bearing. That said I would recommend to look at a better grade of bearing.

Thanks for the reply
Best Regards
Bill

Indeed, the stator bearings wobble and I am concerned about it. Would be interesting to ask @alsetalokin about the importance of this wobble again. It seems he isn't too concerned about it. Nevertheless, will have to try it with a better grade bearings when the weaker rotor magnets arrive.

As for the AGW coupling, it seems that the wobbling doesn't matter. Once its latched it keeps going, that's what I'm observing so far.

Craigy

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Re: Working Magnetic Motor on you tube??
« Reply #1540 on: January 22, 2008, 09:22:22 PM »
just put a stator in on my rig but with 3mm bearings top and bottom. What a difference, So quiet !!! lol


CLaNZeR

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Re: Working Magnetic Motor on you tube??
« Reply #1541 on: January 22, 2008, 09:34:24 PM »
@ClaNZeR,

Just to make it clear?the blue curve is the wind down curve with dampers while the red is without, correct? Is the lone stator latched in both cases? Also, is the hitch between 150 and 200 rpm always reproducible?

Yep correct bot single stator with AGW Latch. Red with No dampners and Blue with Dampners.
Both latched into AGW at approx 360 RPM

Quote
I should add, I think the effect is greater than the one shown because you have to shift the red curve slightly to the left. The two wind down curves have to start from the same rpm. It?s interesting that the effect (aside from the mentioned hitch) kicks in at about 400rpm which is about the rpm where the acceleration appears in the video.

They are both close to their starting points but as you can see the Blue line shows the dampners have a effect without AGW as well.

Cheers

Sean.

ken_nyus

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Re: Working Magnetic Motor on you tube??
« Reply #1542 on: January 22, 2008, 09:36:18 PM »
On detail I would like to point out to the replicators...

Al was quick to point out that the rotor magnets are in one plane, the top of the stator magnets are at a height that begins at the bottom level of the rotor magnets (so the stator magnets are at a plane just below the rotor mags - maybe 0.5" above the base), and then the top of the dampers are at a level just below the stators (this would put them basically sitting down on the base).

I have parts and materials, but no rig to play with, so all I can do is just sit back and pick at the details, but I hope this helps someone.

Most of the replications I see have the rotor mags and the stator mags in one plane, and no dampers involved.

Carl.

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Re: Working Magnetic Motor on you tube??
« Reply #1543 on: January 22, 2008, 09:37:19 PM »
Maybe a vitual elipse in the mag field is what is required? I pointed this out in previously and no one really paid much attention, could the rotor magnets be slightly off center and this cause an slight field anomally which would interact with the stators and the dampers?

Take a look at Al's video again, note how the rotor mags in a couple of places look like they are off center just a bit, what if 2 of them are shifted slightly closer to one side to increase the field interaction? A magnet on the opposite side (180 degrees) is also shifted to compensate for the weight imbalance so we would have the ns-sn-ns pattern but in 2 places we have a stronger repelling field and in 2 other places a weaker one. could this provide the oscillation that is sought?

Just a thought I had. Maybe someone can test this theory if they like.

magpower

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Re: Working Magnetic Motor on you tube??
« Reply #1544 on: January 22, 2008, 09:51:16 PM »
Just a Thought if Sean has contact with AL. Could he lay the rotor on photo copy machine and fax a layout. Then we know for sure if there was any error's in milling. Update with Me still waiting for parts and you guys are doing a great job

Wayne