Mostly Permanent Magnet Motor with minimal Input Power

[Neo-X]

Opps wrong thread lol... 

[Khwartz]

Yes, you are correct!  but in this test the capacitor was connected long enough to discharge completely.

Thanks for your interest

Luc

lol, ok V2 = 0 Thanks for having confirmed. Cheer.

[gotoluc]

Hi everyone,

I have been working on improving this motor design which I came up with some years back.
The idea of this motor design was to mostly use the flux of powerful Neodymium Magnets we now have, since in a standard magnet motor we would not get a power gain just by upgrading the old ceramic magnets to Neodymium Magnets, as we would also have to add more power to the motor coils to overcome the extra attraction force the Neo Magnets have.
However, in my motor design there is no sticky spot, so the more flux the magnets have the more mechanical power the motor has without changing the input power.

I have made a new video which demonstrates this and also demonstrates a better magnet and cores position which takes full advantage of both Permanent Magnet Poles and of the Electromagnet Poles.

This improvement basically double the mechanical output power of my first design without any increase to the input power.

The video should be self explanatory

http://youtu.be/-eTQ49RcFKM

Luc

[gyulasun]

Hi Luc,

Very good progress in getting higher and higher pulling force. Would like to suggest a "tuning method" unless you are also aware of it: just monitoring the coil's inductance on your L meter, you could easily see the effects of any changes in your setup, always aiming for higher and higher self inductance. For instance if you used two cube magnets on top of each other to double their length (I attached an edited picture from video to show it at one side) and this way you would also achieve a double distance between the coil and the side bars. Maybe you do not have enough cube magnets to do this for all the four directions at both main core ends but doing it with two bars, say, at the front and rear sides may show the effect if any.

I assume that the improvement in coil inductance (when you use a side bar to bridge the outer like poles, say South poles) comes from removing the "fringe" South pole flux from the coil area and direct them into the outside bar. I say this because seemingly you indeed close the magnetic circuit by using an iron side-bar but the magnets to be bridged being like poles they cannot close to any other pole in the bar because at the other end of the bar the same like pole enters the bar from the other end magnet.

So I assume that the increase in pulling force does come from the increased coil inductance and this inductance increase comes about by applying more flux from the permanent magnets, shifting the core's working point towards a higher permeability area of the B/H curve. Of course as you also mentioned in the video, there is an upper limit in increasing the flux by using stronger and stronger magnets: this upper limit is set by core saturation.

The possible ultimate core and magnet shape for your setup would be to use a cylinder  core (say a ferrit rod) in the middle (on which also a cylinder coil would slide) and use a ring magnet at both core ends with its ID matched to core's OD and then use a soft iron tube (with certain wall thickness) outside instead of the bars to connect the ring magnets' outer like poles. No stray flux would escape from such setup. 

Thanks, Gyula

[Khwartz]

Hi gotoluc!

Thanks for sharing your very valuable experiments.

I see very brillant your use of bacefm as an alternative drive synchronized with the moving of the coil.

You can use imho this as a very interesting piston motor; a "motor" indeed. But true you can drive a generator and try to find the limit of efficiency of the system.

But before to do so, could you scientifically and rigorously measuring the power output of it? Could you add a pouly with a baril, a wire, a mass, and measure the time your motor will pull the mass up to 1 meter? This giving us the effective mechanical output power to compare to the electrical power. A graphic of the evolution of the mechanical power in function of the electrical power input would be a very must; imho.

Cheer, Khwartz.