A new magnetmotor idea for you to evaluate.

[MagnaProp]

I like the thinking behind this however, I don't think this boat will float.

Issue I see is that even though A is larger than B, B is closer so it can possibly be more attracted to the magnetic bar, preventing A from getting any closer. I think A and B will find a neutral sticky spot and not move past it.

I've noticed that magnetism doesn't appear to fade off linearly. It dissipates rather quickly. One reason why small RC drones can have a magnetometer that is not adversely affected by all the powerful neodymium magnets that are in the surrounding motors.

[Low-Q]

@MagnaProp


Magnetic fields weakens to 1/4 for each 2x distance, just like gravity does.


B is much closer than A, so the most attractive force is at position B, maybe slightly further due to A vs. C.
A vs C can not overcome B from a stand still, but if the initial position is 45° further, A ad B has the same distance, but A is more attracted, so it will generate torque that accelerate the wheel. Inertia will move A past the magnet a bit, so D can come close enough to repeat the cycle. Say if the number of chains isn't two, but 20 evenly spread.


Very light wheel might not work, or it will be noisy due to the cogging. Using a flywheel will smoothen the rotation due to increased inertia.


The principle has more magnetic attraction from one side, seen only from the shape. So from that perpective, this will definitely run.
However, there must be a force that balance out the benefits of greater ferromagnetic mass on one side. I cannot clearly see where this counter forces comes from.


Vidar

[Low-Q]

I made a short illustration of a similar idea using several pulleys, and a string of ferromagnetic chain.
Only 3 sec. video, but you'll see how the wheels turn, and how the chain shortens towards left.
It is a MP4 file. You must probably download the video to see it.


Vidar

[Low-Q]

I have thougt of different scenarios regarding orientation of the magnet. The attatched three images explains how the non vertical parts of the chain (illustrated in the video in previous post) affect the chain magnetically. A north-south horizintally force the red marks to separate. This will be one counterforce that will force the wheel going backwards. This orientation also have the weakest attraction to the whole chain.
A north-south vertically will force the red marks together. This orientation also have the strongest attraction to the whole chain.
The last scenario is a 45° angled magnet. Attractive force on the whole chain is somewhere between weak and strong. It should probably not affect the red markers except attraction towards the magnet.


I ordered a spool of 2.5mm iron chain on Ebay, so this will be tested with a simple loop consisting of two sticks with plastic pulleys/wheels that can seesaw, expanding or contracting the chain close to a magnet. Delivery is not expected untill mid March-April...that is how free shipping works, unfortunately.


Vidar

[norman6538]

To me the most difficult thing to beat when using permanent magnets is the
"closer stronger, further weaker" characteristic of  magnetic fields.

I have often used a variable lever that allows a week attraction to lift a given weight
a little bit because the leverage is greater and then when the attraction is
greater that weight is lifted a greater distance because of less leverage.

If that force was linear I would have demonstrated an overunity PM device 5 years ago.

Norman