Tim's Magnet-Piston Engine Design

[gotoluc]

Hi Tim,

I see, so you think the coil will produce enough flux in the core that the magnets 350lb pull force to the cores would be cancelled and it would only be the epoxy holding the magnet. If so, I would agree that it would not be safe.

I now understand about the two coils. I think this would help get more coil flux to the center core.

Since it's getting more complicated with the magnets. What I would like to do at this point is make a mini version of your idea using the same coil I used in my last video. If with the same power it can pull more than 250g and hopefully much more!   then I would be encourage to consider drilling holes in the center of my 2 inch magnets.

I hope you don't feel I don't trust your design. I'm just more of a physical experimenter and this will boost my confidence.

I'll get back to you with the test results

Thanks for your help

Luc

[gotoluc]

Hi Tim,

I took the day off of my houseboat building to build a mini version of your design variation using the same coil I used in my last video.

I used two 1/2 inch N45 cube magnets on the outside of each core.
Unfortunately, I could not measure any extra pull force compared to my design using the same two magnets on each end of a solid core of about the same mass as your 3 cores.

I'll now wait till you build your own to see how your results turn out.

Thanks for sharing and your time.

Luc

[tim123]

Hi Luc, sorry, I don't understand, could you perhaps take a photo of your setup? Or a diagram?

[gyulasun]

I made a typo with the 960 rpm (wrote 920) but in the calculation I again used 960 so no mistake in result I hope:

...
920 RPM is 960/60=16 stroke per second for your piston setup i.e. 16 Hz, it is 1/16=62.5 msec, ...   

Tim,

Regarding your setup in post Reply #9 ( http://www.overunity.com/13673/tims-magnet-piston-engine-design/msg366379/#msg366379 )  I would suggest a saturation test first for the central iron core as follows:
Before fixing the central core, a 10 to 40 turns of single layer test coil could be wound around it on its outside surface, (wire diameter is not important) and then insert this core+coil into the big coil as shown in the drawing. 
An inductance meter (L meter) is to be connected to the single layer coil to see its self inductance. Then a DC supply voltage is to be connected to the big coil with the calculated current needed to saturate the iron core.  Saturation is seen on the L meter as a drop in inductance for the test coil.  Say as an example the test coil has 200 uH inductance when there is no input current in the big coil and it drops to at least a 10-15 uH value when the 3-4 Amper input current is ON for the big coil. 

Gyula

[gotoluc]

Hi Luc, sorry, I don't understand, could you perhaps take a photo of your setup? Or a diagram?

Hi Tim,

I live on a sailboat in the summer as I don't have a home... and my lab is in a friends basement. So today I'm back at my boat and won't be going to the lab.

What I built yesterday is exactly the diagram you made for me on the previous page. However, in a much smaller scale so it can fit inside the coil opening I used in my last video. This way I could compare your design pull (using the same power) to my results.
The coil opening is a little more than 1/2 inch x 5/8 inch and the coil is 1 inch and 1/4 long. So a center core was made to fit snug in the center of the coil and two moving cores were made which were attached to a 1/8 inch round shaft that goes through the center core. The 3 cores are about 1/4 inch thick, so we have 1/4 inch movement in each direction.

I powered your design (without magnets) and got no movement. I then attached two opposing 1/2 inch cube N45 magnets (one on each core side) and got movement when the coil is powered.
Your design pull (before cores magnetically contact) was 60 grams which is double the result of my first test (with no outside cores) in my video demo using only two 1/2 inch cube magnets. However, I then realize I cannot compare your results to mine as my center core was 4 inches long and much of the two 1/2 inch cube magnet flux would be much lower, so less pull should be the result.
So then I removed your core design out of the coil and cut a 1 inch long core to fit the coil, this way the magnet flux to core volume would be a little more comparable. I attached the two 1/2 inch cube magnets to each end and powered the coil and got the same 60 gram pull force.

So unfortunately I cannot see the advantage, unless you are considering when your center core magnetically locks to the moving core, then it would have more pull force at that point. However, you then need to supply power to remove it, so I'm not considering that as a power gain. Is that wrong?

I hope you better understand the tests.

Thanks

Luc