Elementary Physics Revisited

[gotoluc]

Does anyone know if there is a limit to how much you can upload to this site?
I'm asking if I should upload updates to my papers here or not.

/Hob

I've been uploading stuff (at this site) for years and never had any limit problems. I know it's an issue at EF but not here.

Luc

[nilrehob]

I've been uploading stuff (at this site) for years and never had any limit problems. I know it's an issue at EF but not here.

Luc

Ok, then I'll upload them all here once in while when they have been updated, like now; my first 4 papers freshly updated are attached.
The 5th paper is in a post above.

/Hob

[TinselKoala]

Read the fine print:

Allowed file types: txt, tif, xls, doc, odt, pdf, jpg, jpeg, gif, mp3, mpg, flv, mp4, mpeg, png, rm, ra, rmv, avi, zip, wmv, wma, rar, qt, mov, swf, asf, wm2d, 3gp, 3g2
Restrictions: 12 per post, maximum total size 7000KB, maximum individual size 7000KB

(Just under the "Attach:" window when you are entering a reply.) Note that the forum sometimes has trouble with .zip format files, and that .bmp images are _not_ allowed.

If you upload inline images please try to keep the physical size under 1024 pixels wide. Larger widths will run off the page and screw up the page formatting.

[nilrehob]

Read the fine print:

(Just under the "Attach:" window when you are entering a reply.) Note that the forum sometimes has trouble with .zip format files, and that .bmp images are _not_ allowed.

If you upload inline images please try to keep the physical size under 1024 pixels wide. Larger widths will run off the page and screw up the page formatting.

Thanks!

/Hob

[gyulasun]

Hi Hob,

Thanks for the paper, interesting read. I have not seen such conclusion as the amount of copper determines the force per power ratio, it includes more things than the length of the wire, this latter was known of course as the more turns (i.e the higher inductance), the more force.

Would like to read your opinion on the following winding method I think I read it from member wattsup long time ago.
It involves a multilayer coil, say when the first layer is finished, you do not continue the winding backwards to make the second layer but you bring back the wire straight to and above the start of the first layer and you make the second layer in the same winding direction as the first layer was wound. Then finishing the second layer, you bring back the wire straight again to and above the start of the second layer and make the third layer in the same winding direction as the second (and of course the first) layer was.  And so on and on with the rest of the layers if needed. No any other special requirement on the shape, sizes etc of the coil wound this way was mentioned.
Can you judge whether there would be any advantage in using such winding method? I have not tested this, just occured to me that you or your colleague may have some info on this, or just a gut feeling? 

Thanks,
Gyula

We have a new paper out, its the 5th and its called "Increasing Electromagnet Force".

It focus on the force per power ratio in coils.

Since the concept of an electromagnet is present in both motors and generators we find it interesting to study the relationship between the parameters describing the electrical power the coil consumes and the mechanical force with which the coil attracts a piece of ferromagnetic material or a magnet.

The amount of copper in an electromagnet determines the force per power ratio, not the number of turns or the wire thickness in the coil, the more copper the greater force.

To get the best performance in an electromagnet it should be as big as possible, which leads us to believe that motors should have as few and big coils as possible (think Joseph Newman) to increase torque per power. We also believe that the reverse is true, that generators should have as many and small coils as possible to decrease torque per power.

You can find all papers here:
https://sites.google.com/site/nilrehob/home/elementary-physics

/Hob