Gravity Motor Patent 7/10/08

[CLaNZeR]

Sorry you can't take the week off and keep at it.

Any chance you can show us your new set up before you head off to work?

LOL if I took a week off, everytime I wanted to build something I would be skint. With this FE/OU stuff you have to find a balance as others have said and do not let it rule your life.

I was up at 5:30am and out the door for a long drive to work, so did not have time to take any photos.

I was sorting some bar magnets today, going for a 1 meter Wooden wheel and wanted some nice weighted magnets to make sure it moves and looking to order some these


They are Diameter 3/4" x 1.5" in length Rods - Grade N42.
Not sure whether to go for 8 arms or 16 at this point so far.

I then went on to source some Pirex 20mm glass tubes, as this would cut down the friction, but then a second thought that maybe plexiglass would be better as if I need to use latches atleast I can cut it  . The glass tubes would be cool if using the magnets top and bottom for latching though.

Hopefully I will get it sorted and ordered to arrive for the weekend.

Cheers

Sean.

[CLaNZeR]

MO when you get it dialed in, try to shoot some video of it with whatever you have. Between Aaron and I we can convert/encode it into some usable format. Even my digital camera can shoot digital video if you need to borrow. I have a cheapie digital video cam you could use as well didnt think of that, we got tripods and everything you prob need.

Yep agree get dome videos up, it all helps us and get a close up of those latches as my mind needs to see them in action 

[TinselKoala]

@CLaNZeR: Yep. (Shhh!!)

Here's my mondrasek magnet-assisted gravity wheel, on its base, with axle and bearings.
I didn't have the right camera today so the pix are kind of low-res. Better ones (and stator mounts) tomorrow.The big white thing in the pix is the axle mount, just a block of UHMW plastic to hold the axle securely.
Would you believe--it already almost runs....  even with no stator mags.   
.

[CLaNZeR]

@CLaNZeR: Yep. (Shhh!!)

LOL 
Nice to see you mate, sorry if I am a bit slow..

Here's my mondrasek magnet-assisted gravity wheel, on its base, with axle and bearings.
I didn't have the right camera today so the pix are kind of low-res. Better ones (and stator mounts) tomorrow.The big white thing in the pix is the axle mount, just a block of UHMW plastic to hold the axle securely.
Would you believe--it already almost runs....  even with no stator mags.   
.

Looking really good, you are as bad as me and just Love to build

Still like the idea of magnets on the end of the tubes, what do you think of using metal instead, just need to find one that does not attract the magnet too much to stop it being pushed away by the stator, maybe the old metal test videos would help us decide?

http://www.overunity.org.uk/CLaNZeR-doing-Gabys-PM-switch-test.wmv

http://www.overunity.org.uk/CLaNZeR-doing-Gabys-PM-switch-test-Part2.wmv

Cheers

Sean.

[mondrasek]

Clanzer,

My first experimental rig used the simple mass switch design shown in the patent app.  It had the magnet latching at both ends of the tube by attaching magnetically to steel pins.  These can be used to make a gravity motor, but there are several problems.

1)  Centrifical force becomes more of a concern.  If the wheel is spinning too fast the magnets will not reach their target which is also true with the mechanical latch.  Both are RPM self regulating in this respect.  But if the wheel moved too slow they can hit their targets with too much force and bounce back.  Therefore you must design switch lengths for a specific RPM range.  The switches with latches are never limited by the wheel running slow at start up.

2)  The stator magnets are also attracted to whatever ferous end cap/target you use on the mass switches and slow the wheel.

3)  Centrifical force combines with gravity on the bottom but is against gravity on the top.  So the kick needed from the stator magnets is different on the top and bottom.  The length of the tube cannot be perfectly optimized for a given RPM.  Using the center latch allows me a broad band of RPMs to work with since I can always overshoot the latch with lttle or no negative effects.  However, the need for different upper and lower stator magnet forces may be overcome by placing the stator magnets at different distances away from the switches at 6 and 12 however.

It was because of these issues that I wanted to latch mechanically.  It is a more robust and forgiving design upon start up and can still be optimized with the proper load and stator magnet positioning.  And it had the effect of almost doubling the travel distance of the switch magnets in the 9-12 and 3-6 quadrants.

I believe the ultimate design will end up being to have two separate one way gravity latches at each end.  That way you could fire the switch magnet the entire length of the tube (easily more than the 8 1/2 inches in my build) and hold it there, not at only past a latch in the middle.  With this improvement all the light side magnets would be at the axel end of long switch tubes and all the heavy side magnets would be at the rim end of long switch tubes.  This would maximize available output torque, but would also require two latches per switch (more work to build in a prototype but not a problem for production devices).