Re: 5000RPM in 5 mins
Alex, Wed Aug 30 2006, 06:25AM

Hah! That's very cool. Now someone needs to do it with +50A and a several pount magnet.

Re: 5000RPM in 5 mins
Avalanche, Wed Aug 30 2006, 08:39AM

Awesome, I just made one with bits lying on my desk

It's stuck to the edge of my desk, still spinning away as I type this

Re: 5000RPM in 5 mins
Part Scavenger, Wed Aug 30 2006, 11:15AM

Pretty Cool. I've got to try that when I get home

Re: 5000RPM in 5 mins
Psyko, Wed Aug 30 2006, 02:31PM

I have tested it too. How to impress the family ?

Re: 5000RPM in 5 mins
Conundrum, Wed Aug 30 2006, 08:55PM

Hehehehehe... i have some very powerful "threaded" magnets off a bath kit (???!!!!!) which may be suitable with some careful pwnage with Mr Dremel :)

DO the edges of the magnet have to be exposed for this to work?

-A

"Bother" said Pooh, as he took the blue pill...

Re: 5000RPM in 5 mins
Steve Conner, Wed Aug 30 2006, 10:24PM

I made one at work with some NIB magnets we had lying around, and everyone thought it was pretty cool No promotion though

Re: 5000RPM in 5 mins
Tesladownunder, Thu Aug 31 2006, 01:06AM

So still only 3 replications of this experiment? Is that because 4HV members can't find 5 mins or cant find a screw? Even Steve Connor could find one

Peter

Re: 5000RPM in 5 mins
Nik, Thu Aug 31 2006, 02:58AM

I dont have any round NIB magnets but I'll keep my eye out for one, this is too easy to pass up.

Re: 5000RPM in 5 mins
Coronafix, Thu Aug 31 2006, 03:16AM

The reverse is also true. By spinning the magnet, power can be taken off the axis and circumference. Sometimes known as the faraday or homopolar generator. JlnLabs shows a small one here.

Re: 5000RPM in 5 mins
Tesladownunder, Sat Sept 02 2006, 03:35AM

From the rules of this forum:
"Free energy, electrogravitics, and all other types of pseudoscience are not allowed on any part of this site, nor are links to sites that deal primarily with these subjects."

Tesla did some homopolar generator stuff and has a patent related to it.
The biggest one however, was built here in Australia and stored 500MJ. Just great for those 2MA experiments. I am old enough to remember it being used as a railgun supply.

Peter

Re: 5000RPM in 5 mins
Bjørn, Sat Sept 02 2006, 12:12PM

I made it work with a proper PSU instead of a battery. Even at 0.5V it welded the bits together all the time so it was a complete pain. A NiMh battery works a lot better.

Re: 5000RPM in 5 mins
Avalanche, Sat Sept 02 2006, 10:36PM

I was too afraid to use a nimh, at least with my fingers holding the wire


well I tried...not much response even after I built one in 30 seconds in front of my Dad.

"So it's just a motor then?" ... "um....yeah, but this is no ordinary motor." ....... "it... it breaks all known laws of physics as well" ... 10 mins later - "I guess we still have a lot to learn then"

Re: 5000RPM in 5 mins
Nik, Sat Sept 02 2006, 10:42PM

I set up the homopolar generator and used my drill to spin it. The results were not amasing but they were results none the less. At 1200rpm I got 1mv at 3-4mA.

Re: 5000RPM in 5 mins
IamSmooth, Sat Sept 02 2006, 10:45PM

I am guessing that there is a magnetic field set up in the screw. What is this exerting a force against to setup the spin?

Re: 5000RPM in 5 mins
Tesladownunder, Sun Sept 03 2006, 02:43AM

Better = faster. Any idea how fast?

Peter

Re: 5000RPM in 5 mins
IamSmooth, Mon Sept 04 2006, 03:58AM

Does anyone want to comment on how this actually works? What force vec tors are present?

Re: 5000RPM in 5 mins
Electroholic, Mon Sept 04 2006, 09:55AM

Hello? Fleming's Left Hand Rule?

Re: 5000RPM in 5 mins
Marko, Mon Sept 04 2006, 10:54AM

Unfortunately, I don't own sophisticated equipment required to replicate the experiment..



Don't have any round Nd magnets..

Re: 5000RPM in 5 mins
Tesladownunder, Mon Sept 04 2006, 11:51AM

It's 20 years since I had anything to do with the left hand rule but here goes.
Basically the magnetic field is directed in lines of force from North to South ie along the axis of rotation -say your index finger pointing downwards.
The current goes in towards the centre of the axis of rotation, like pointing with your middle finger at the magnet.
The force exerted on the conductor at the point the wire touches the magnet is your thumb and it moves at a tangent to the contact point of the magnet and hence rotates.

Peter

Re: 5000RPM in 5 mins
IamSmooth, Mon Sept 04 2006, 05:53PM

I ordered some rare earth disc magnets on Friday. I'm going to show this to my daughter. I understand that these magnets are very strong.

Edit:
This will probably help others visualize what was said above by TDU