Gravity Motor Patent 7/10/08

[mondrasek]

Magnet Helper,

Great.  Let's start a model using some common materials.  I recently ordered and received 24 1/2 dia x 1/2 long neodymium magnets rated ~ N45.

I'd like to have them in phenolic tubse that are .580 ID and .75 OD (not so common, I know, but not as exotic as carbon fiber and very available).  OAL we'll make 8 inches.  Capture the magnets in the the tube with phenolic disks .75 dia and .05 thick.

Can you wing the whistle cuts and latch or do you need me to CAD something up?  Latch can be brass for now.

Mount the tube and latch to a 1/4 x 2 x 7 wood strip with 1/2 x 2 champhers at the end that will point towards the axel like in the pictures of my build on the bottom of page 2.  The tube should hang off each end of the wood strip equially.  This will be one switch module.

We can start with an array of 4 modules on a 24 inch diameter wheel.  Wheel should be wood 24 dia and 3/8 thick.  Array equally so the bottom edge of each mass switch is hanging 1/4 inch past the rim of the wheel.  Bearing system is up to you.  Should not need to be non-conductive or anything special.

The stators will be 1/2 x 1/4 x 1 N40 neodymium magnets.  Place them in position so that the 1 x 1/2 surfaces are centered and face the bottom of the switch tubes when at 6 and 12.  The switches should approach the 1 inch edge.  Adjust the gap between the stators and the switches so that they throw the switch magnets up the tubes just far enough to make past and then fall back and catch on the latch when the wheel is forced to rotate 33 RPM.  That'll be our maximum RPM design target.

We can begin doubling mass switches on the wheel as needed from here.  Also, we can increase the wheel diameter if need be (unless we find what makes this another non-runner idea first).

Let me know if you have any difficulties with this plan or need more info.  Also, PM me if you want to exchange or have my cell number to discuss further.

M.

[Magnet Helper]

The information you supplied looks sufficient to get started.  I will probably ignore the latch since I was really only interested in the inertia of the wheel and the latches won't add much based on the other components.

This will take a while to get the magnets correct since I have to find the equilibrium point, or at least get a close approximation.

One thing I just realized, and you don't have to comment, but you mentioned something about 33 RPM.  The way I see this working (if it works the way it is intended) is that there is always a torque applied to the wheel due to it being out of balance.  Unless there is a friction, the torque will continually apply an acceleration, so the wheel would continue to gain speed with time.  We know, that in the practical world there will be some friction, but I am wondering where the 33 rpm's came from.

As I said before, it is not important because my model will calculate the net torque and determine the acceleration and velocity and be able to plot them with time.  Of course, my model will not include friction, so you will see the best available scenario.  I can put in friction if I wish, but I don't think that will be necessary.

[mondrasek]

MH,

Centrifical force is in play and acting on each switch magnet with increasing force as the RPM increases.

If we set the stators to mass switch gap so that the switch magnet only fires high enough to make the latch at 33RPM, the switches will not fire high enough to reach the latch at 34 or higher RPM.  The design is self governing with respect to RPM.  It cannot run awy beyond the RPM where centrifical force causes the bottom switches to stop working.  If it does it will slow back to 33RPM and below where the switching will begin to operate properly again.

I just chose 33RPM arbitrarily as a design parameter for this test.

Having the stator magnets closer to the switches than necessary to just sustain 33RPM would allow for a higher maximum RPM.  But doing so also increases the wall that is the repeling force each stator has when each mass switch approaches.  It would increase the number of switches and possibly the diameter we would need to build a self running device.

I hope to adjust the other variables in this design so that it works with the 24 1/2 dia and 1/2 long magnets I have or less.  This is so (if we run) others can build a replica relatively simply and easily.

M.

[gwhy!]

Hi Everyone,
  Just playing catchup on this thread.. Its all looking and sounding very good and all positive input. Just thought I will pop by and say well done and a very big up to the builders taking this concept on (nice) ..... 

[ThothTheSecond]

Just a thought from a newbie here.  I can understand the whole wall thing when two magnets interact with each other, but what if there were no magnets in the rods

Just a piece of metal/ball/whatever that would be repulsed by the magnet on the outside at 6, past the latch.  Then the same would occur with the magnet on the inside at 12.

Would there still be a wall ?