Gravity Motor Patent 7/10/08

[dudeman750]

forgive me, but why so short travel on the tubes?

[Harvey]

 Clanzer wrote:

As you can see they got chopped down alot. Please to say the wall is not so bad with a big wheel and not so much stress on the bearings as I thought

This is an important aspect of these systems if they are going to work. The momentum of the wheel for the desired RPM must equal all negative torque thus balancing the system. These leaves all positive torque free to maintain RPM. Thus you capitalize on the conservation of angular momentum. It would be a mistake to think 'the more momentum the better', as the increase in mass distribution involved is counter to the positive torque and also adds unnecessary friction to the bearings. So you want it to be the minimum required.

So your video demonstrates two things of note.
1. The speed of the magnetic field increases its reaction. This results in the plunger 'bouncing' off the top.
2. You have a timing constraint relative to the acceleration of the plunger even with the shorter distance.

#2 Thus illustrates that the stator field must be wide enough to stay in play for the duration of the plunger travel at the desired RPM.

So far slow good! (pun on the RPM constraint)

As always your construction and documentation exceed our expectations in both time and quality

Cheers,

Harvey

[CLaNZeR]

forgive me, but why so short travel on the tubes?

Because after spending hours chopping them down, that is the best configuration I have came across with these magnets and the stator I am using.

But do not worry , I have some smaller tubes that have arrived and plan on using smaller magnets as well which will have longer travel.

The travel in my mind does not matter, because it is in the in-balance of the wheel that counts.

The wheel is well balanced and simply by adding a small weight such as a couple of big screws will make it rotate 180 degree's. So you do not have to shift long distances to in-balance the wheel. The more length you are moving the more friction you have involved and also the more energy it takes to get that magnet to travel that distance.

This is just my findings after playing today.

[CLaNZeR]

So your video demonstrates two things of note.
1. The speed of the magnetic field increases its reaction. This results in the plunger 'bouncing' off the top.
2. You have a timing constraint relative to the acceleration of the plunger even with the shorter distance.

#2 Thus illustrates that the stator field must be wide enough to stay in play for the duration of the plunger travel at the desired RPM.

So far slow good! (pun on the RPM constraint)

As always your construction and documentation exceed our expectations in both time and quality

Thanks Harvey

While using steel screws instead of the latches to keep the magnet where it should be at any given time is one part of the main key to this working in my mind.

I now feel that the heavier/bigger wheel has overcame the stress on the bearings as the wheel just turns, looks at the wall and Rolls it's eyes as it goes in and out very happy

Also it only takes a small in-balance on a wheel of this size to get it turning.

After playing and getting a feel for this today, I have to concentrate on getting the correct amount of steel on the end caps that hold the magnet where it should be, but also is not strong enough to stop the magnet being released as it passes the next stator.

If I can get this right I would expect after a spin up that the initial RPM would blow the routine all out of sync, but as the speed drops I would hope it found the SWEET spot RPM where everything dropped into sync as such.

Bit more playing will tell!

Cheers

Sean.

[mondrasek]

1. The speed of the magnetic field increases its reaction. This results in the plunger 'bouncing' off the top.

I am not so sure that the magnetic field increases with speed.  I think it is the centrifugal force that is causing the bounce.  The faster you spin, the more centrifugal force is acting on the switch magnets tending to throw them to the rim of the wheel.  Going slow you have only the repulsive force of the stator magnet (on top, 12 o-clock position).  When you add rotational speed you add centrifigul force.  So now you have the repulsive force of stator + centrifigul force.  The added centrifugal force is causing the switch magnets to shoot too high and bounce back off the sends.  That is what makes the "magnetic latch" version so hard to set up.  It really needs to be tuned for a specific RPM.  It was this realization that caused me to switch to the more forgiving (but possibly less efficient) mechanical latches.  A mechanical latch system can be tuned and will work at any RPM below where centrifugal force does not allow the bottom (6 o-clock) stator to fire switches all the way to the latch.

Sean, it looks great so far!

M.