Marko Rodin

[rave154]

Hi all,
im using the outputs of the 494 chip, pins 9 & 10, the emmiters, im assuming from what ive read that they are flip-flopped to each other.....but i have no way to test....is this right?.....when 9 is "on"....then 10 is "off" and vice versa?

Thanks,

David. D

[nvisser]

That is correct. It is like switching polarities

[marxist]

no luck levitation but found additional winding methods

Hi rave and all,

I understand that in order to get levitation it is easiest to wind a 'bifilar' coil as described by Jamie Buturff in this drawing:
http://www.alexpetty.com/wp-content/...odin-coil2.jpg

I call this a 'step_41' coil as you have got to always go 41 notches or pins forward while winding (see his drawing).

I have made such a coil, but am for the moment unable to get levitation. I can get good magnet jerking, using my square wave signal generator and 12 V from a car battery (with the inverted signal on the second strand).
I use 21 W car lightbulbs as loads.

I hope I will achieve levitation once the ordered neo sphere arrives. Up till now I only had neo disc magnets to try with. They get pushed up, but then flip all the way round and don't hover. Bastards.

However, while thinking about the step 41 winding method I realized that there are other stepping methods, which will result in filling the 120 spaces - and then the snake biting its tail, so to speak.

Schematic examples for such winding methods can be seen in the attached drawings (step 43 and step 47). I did not draw in all the winds, but it will work out with the 120 places, filling each place once. I tried it. The first wind round is indicated bold in each drawing.

edit: I changed one of the drawings as the version I had posted originally contained errors.

[rave154]

MARXIST,

i will be interested to see what happens when your neo sphere arrives and your novel winding pattern

[marxist]

prime numbers

Talking about winding patterns with the snake biting its tail, I forgot to mention:

If a mathematics person can explain which other stepping-patterns are possible so that each of the 120 spaces is filled once and the snake bites its tail, and how to find these patterns I would be grateful.
Does it have to do with the step being a prime number?
(As 41, 43, 47, ... are all prime numbers)

[rococo]

Talking about winding patterns with the snake biting its tail, I forgot to mention:

If a mathematics person can explain which other stepping-patterns are possible so that each of the 120 spaces is filled once and the snake bites its tail, and how to find these patterns I would be grateful.
Does it have to do with the step being a prime number?
(As 41, 43, 47, ... are all prime numbers)

Hi, first post here. The possible patterns for a 120 pin configuration are, starting from pin 0.
1, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 49, 53, 59, 61, 67, 71, 73, 77, 79, 83, 89, 91, 97, 101, 103, 107, 109, 113 and 119.

Obviously the first and last patterns are of no use, since they are practically circles.

It is interesting that all of them are prime numbers with exception of 49, 77, 91 and 119 which can be divided by 7 (7, 11, 13, 17).
They mirror each other from 59 to 1 and from 61 to 119 being the only difference the start of the winding from pin 1 to the left in one case, to the right in the other.

I will post drawings of the patterns if you want.

[rave154]

I just noticeed in that list of primes, that the difference between succeeding numbers is always a 2,4 or a 6....

[rococo]

1, 7, 11, 13, 17, 19

Here are the drawings. Any thoughts?

[rococo]

23, 29, 31, 37, 41, 43

Here are the drawings. Any thoughts?

[rococo]

47, 49, 53, 59, overlapped

Here are the drawings. Any thoughts?

Please see full detail of the overlapping here Full Detail

[marxist]

thx rococo

Hi rococo,

thx for working out the possible steppings and posting the drawings.
I hope I can comment something meaningful after my magnets arrive.

How did you work out the list of possible stepping patterns?

BTW, as is visible in your drawings, the diameter of the center hole is different for each stepping. I found that too.
I think that a coil with a stepping pattern with big hole size will have a weaker field in the center.
So I put in the cardboard to make that hole smaller, so as to achieve a smaller center hole size, to boost/concentrate the field strength in a smaller "eye of the storm".

edit: changed the pic, as the earlier one contained a mistake in the winding pattern

[Cloxxki]

Excellent work rococo!
I too noticed the size of the hole, already in the earlier posts. Not surprisingly, but pictures speak a million words here. It might be worthwhile for the first-time Rodin Coil winders to pick a winding that will have the wires pressed on the inside of their Playmobile toroids, rather than crossing over forming the shallow webbing. If one goes to wind a toroid, wires should describe one, right?

[rococo]

spreadsheet

I used Excel for calculation. Corel Draw for drawings.

I attached a Word document with an embedded spreadsheet. (No .xls allowed)

Open in Word. Double click to edit. Change only the green cell for any pin number 1 to 120 and press Enter. Check complete column J. If you see the word "invalid" then the number is of no use for this configuration.

[rave154]

just came across this, a 3-D animation of electron flow through a Rodin coil... really gives you a good "Visual" of whats going on

YouTube - Rodin Coil 3D Draft

[marxist]

yes it spins, but in the "wrong" plane

..[snip]..... I use my headphone jack out into the MP3 player of my stereo amplifier. Then those 4 wires get connected to the coil. Left channel positive to Circuit A starting, left channel negative to Circuit A ending. Right channel negative to circuit B starting and left channel positive to circuit B ending. This gives you counter rotation. Then you set the signal generator so the 2 channels are 180 degrees out of phase with one another....[snip] ...

I think there is a typo in this recipe !?
The red "left" should actually read "right"
Or am I wrong?

However, please see:
YouTube - sphere spins, but in wrong plane; around wrong axis
I tried to describe the setup in the descriptive text of the video.

Rave and others who can help:
In order to levitate a sphere must spin around its polar axis, and in a horizontal plane doesn't it?
That is to say the polar axis is and remains directly upright?

Mine won't do that.
Why is my magnet "rolling" as the magnets in the motors of mavendex
YouTube - mavendex's Channel
and of geminitric
YouTube - Rodini Motor schematic and walkthrough

I would like the sphere to spin upright like a spinning top and as I suppose jamie's and rave's do.
What am I doing wrong?