1. Home
  2. Electronics Design
  3. Create Rotational Field with Sound Card Output

Create Rotational Field with Sound Card Output

I have four cylindrical coils standing on their ends in a square configuration. IOW if you drew a square on the table, one coil would be at each corner, facing upward,

To these I would like to apply a signal of any description, and have the net field intensity progess in sequence around the four coils to produce a rotating magnetic field.

The trick is that I want to do this using only the two channels of a stereo PC sound card.

Is this possible? Perhaps by manipulating the waveform, using a network of diodes, etc?

I would settle for any net rotational motion, or simulation thereof. It does not need to be uniform or of constant intensity.

Just something other than two phases shifting back and forth without any circumferential progression.

Any ideas?

Mark Newman

Reply to
mnewman
Loading thread data ...

1 2 3 4 just wire opposite coils in series but reversed 1 and 4, 2 and 3. connect pne pair to the left channel and the other to the right and play back two waves that are 90 degrees shifted.

Balance an aluminium pie tin on a pin in the centre and you should see it start to spin.

--
For a good time: install ntp 

--- news://freenews.netfront.net/ - complaints: news@netfront.net ---
Reply to
Jasen Betts

just guessing here

NE corner = 0 degree phase Sine wave

SE corner = 90 degree phase Sine wave

SW corner = 180 degree NE Sine wave

NW corner = 180 degree SE Sine wave

Did I guess correctly?

Reply to
rev.11d.meow

this is the same as the 0 degree the wires swappwed

I think you mean 270 (which is the same as 90 with the wires swapped.)

--
For a good time: install ntp 

--- news://freenews.netfront.net/ - complaints: news@netfront.net ---
Reply to
Jasen Betts

Use two sound cards in one computer.

Reply to
Greegor

When you say it "doesn't work" can you please explain why? It does not seem logical that the rotation should be suddenly lost altogether.

What does the resulting field actually look like if the coil axis are parallel as I originally described, each being about 20mm from the other?

If the rotation somehow disappears in that instance, how about canting all the coils outward at 45 degrees?

Mark Newman

Reply to
mnewman

Yep. Eddy current speedometer.

--
Jeff Liebermann     jeffl@cruzio.com 
150 Felker St #D    http://www.LearnByDestroying.com 
Santa Cruz CA 95060 http://802.11junk.com 
Skype: JeffLiebermann     AE6KS    831-336-2558
Reply to
Jeff Liebermann

On a sunny day (Sat, 23 Nov 2013 16:26:18 -0800 (PST)) it happened Lasse Langwadt Christensen wrote in :

Old electrickity power meters used an alu disk, with a red or black dot, you could see it spinning faster if you used more power. Mechanical counter connected to it. -> kW

Reply to
Jan Panteltje

And! those magnets are so strong that a driver is exposed to much higher levels than allowed by Swedish MPR II Rules regarding exposure from magnetic sweeps from PC Monitors.

Reply to
RobertMacy

Hmm, well the topology is totally different. in one you have all the coil axes in the same direction. In the other you have coil pairs with orthogonal axes. Very different.

E-M fields obey super position.. The resulting field is the sum of the individual fields from each coil.

I'm sorry explaining what it all 'looks' like is pretty hard for me to do with words. I need a white board and lots of hands waving around.

George H.

Reply to
George Herold

ElectronDepot website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.