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Solid States Devices => solid state devices => Topic started by: sparks on March 01, 2008, 03:12:10 PM

Title: What happens when you draw a wire through a horseshoe magnet?
Post by: sparks on March 01, 2008, 03:12:10 PM
      We know passing a bar magnet perpendicular to a conductor creates migration of electrons towards one end of the wire.  Faraday gave us that.  Then somewhere it is written that if we pass the magnet along the wire nothing happens.  I have seen several instances of guys dropping magnets in tubes of copper or aluminum and they seem to defy gravity.  They generate emf in the copper as they pass along the tubes surface.  This current creates a magnetic field which opposes the field of the permanent magnet.  So if we draw a piece of copper through a horseshoe magnet it is producing electricity in the wire just not where we want it out at the end of the wires.  If the tpu collector winding is the equivalent of the copper tube.  And the kick windings are the magnet drop.  What kind of emf is produced in the collector?  If we put a conductor in place of a magnetic armature in a relay coil and pulse the coil what goes on inside the conductor?
Title: Re: What happens when you draw a wire through a horseshoe magnet?
Post by: Localjoe on March 01, 2008, 06:40:48 PM
@sparks

Its like erasing a tape cassette. If you had a coil and a microphone and the wire was in the center of this coil and you dragged the coil from one side of the wire all the way to the other while speaking. it would re orient the magnetic domains in the wire and "encode" your voice , you could then replace the mic with a speaker and walk the coil back down the wire to hear what you recorded..  I imagine that a perm horshoe mag would wipe that recording out or reset the domains so to say.
                                                                                      Joe
Title: Re: What happens when you draw a wire through a horseshoe magnet?
Post by: nightlife on March 01, 2008, 06:57:08 PM
Localjoe, are you sure about that? Would the coil need to be powered?

 If that was true, dont you think the sound would be reversed to where it came out backwords?

 And if it is true, that would be saying that the wire stores the vibrations.

 Now I find myself being sent on another mission. LOL
Title: Re: What happens when you draw a wire through a horseshoe magnet?
Post by: nightlife on March 01, 2008, 07:37:08 PM
That would mean that electricity is nothing more then a sound vibration and the wire is a antenna. The same then could be said about a magnet in a way.
 The magnetic flux would just be vibrations with one vibration being in the opposite direction of the other. A north seeking vibration and a south seeking vibration. The actual core would act as a antenna to keep the vibrations attached. This would explain how a iron core is attracted to both north and south poles and how magnets are repelled by the same poles when they facing each other.

 The calmer the vibration, the less powerful it is and the more vibrant, the more powerful it is. It is said that DC current doesn?t have  a pulse factor and that would be saying it have no vibration factor but I think it does and we just don?t have the equipment necessary to detect it.

 The resistance created would determine the strength of the vibration and the flow would determine the current of the vibration.

 A good test to check this would be to strike a object in the direction of a coil having the coil attached to a meter to see if any power is created. The negative should be the lead located at the entrance of the vibration and the positive should be the lead located at the exit of the vibration.
Title: Re: What happens when you draw a wire through a horseshoe magnet?
Post by: Localjoe on March 01, 2008, 11:25:04 PM
@nightlife
yes that would play it back backwards you would have to walk the same path you recorded it. Only works on iron wire, and the vibrations from the coil the mic is attached spatially magnitizes the wire encoding you music or recording it so to say.
Title: Re: What happens when you draw a wire through a horseshoe magnet?
Post by: sparks on March 02, 2008, 04:40:05 PM
    Maybe I can answer my own question by looking at none other than the hottly debated vacuum tube.    I believe the torroidal coil on the back of the picture tube focuses the electrons coming off the emitter plate.  So the current inside my wire being drawn through a horseshow magnet (or for a better ananlogy an energized coil)  is from the surface of the wire to the core of the wire.  This electron migration would produce a magnetic field that would oppose the magnetic flux change that caused the current to begin with.  So the faster I pull the wire the harder it should become?  Or:  The wire leaving the coil see's a magnetic flux change going the other way.  An unfocusing magnetic field.  This would cause electrons to flow from the core to the surface.  The opposing magnetic field from this current would accelerate the wire then.  What has effectively happened within the wire is an oscillation of current  that is drag free.
   I am not sure if this amounts to anything unless we take the ambient magnetic field into account.  When the wire exits the coil the surrounding magnetic field is the defocusing magnetic influence.  When the wire was coming in and the electrons were being focused the ambient magnetic field didn't work against it , this was just the electron starting positions.  But when this focused electron pack exited the coil it was the ambient magnetic field that did the work returning them to the starting positions.
   I'm going to put a conductive tube inside a coil that is optimized for linear self induction (turns non overlapping of good diameter or better yet flat wire.)  Then hit the coil with 24khz and see if my theoretical voltage arises between the surface of the conductor and the interior. 
Title: Re: What happens when you draw a wire through a horseshoe magnet?
Post by: PulsedPower on March 03, 2008, 07:40:52 AM
Dragging a wire though a magnet still makes electricity only is apears across the conductor diameter which is not really much use unless the conductor is wide and has current pickups on each edge. This effect is often used in reverse where it is known as as an MHD pump. I once toyed with the idea of shooting a jet of sodium between the poles of a magnet and picking up the electricity which appeared across the jet width.
Title: Re: What happens when you draw a wire through a horseshoe magnet?
Post by: sparks on March 03, 2008, 01:19:54 PM
    Thanks for the reply.  MHD magnetic hydro dynamic pump I think.   I need to rename this subject to what happens when you draw a wire through a solenoid coil.  This is a little different then the horseshoe magnet because the poles are longitudinal to the wire draw.