Inductive Kickback

[synchro1]

Hi all

Youp seems not to be so easy this flyback spike understanding.

For me what i see on the scope is that at the end of the pulse, when the reed sharply opens, the current trace goes to almost  instantly (verticaly) to zero. And only AFTER this shut down,  begins the flybackspike.

So to me the current who build up the magneticfield is gone , totally dissipated, finished at the end of the pulse. He was totally used to precisely build the magnetic field. So he has no more direction at all.

Than it stays the expanded magnetic field around the coil (??) and what exactly happens at that point is ?? But  on the scope ,  suddenly a strong narrow  "high negative voltage" trace appears  and also a strong very very narrow and strong current trace (not shown on the pic) also. What does create this event is still puzzling to me.

If it is the collapsing of the magneticfield please explain the process with simple words if possible.
But anyway to me that is a new current who has nothing to do directly with the one that created the magneticfield. It is what i call hes "son"

Youp, please don't shoot me down it's only an idea.

Laurent

@Woopyjump,

Thanks for the test results. They confirm everything I've been saying!

Faraday's Law (loosely) states that current is generated when a magnetic field moves across copper windings. The collapsing magnetic field is moving across the coil windings as it shrinks inward. Like a balloon: You blow air in, it expands. You release the air and it blows out the hole with a force. This force blows across the coil wraps from outward to inward. This is in the opposite direction from the initial field expansion. 

[tinman]

@Woopyjump,

Thanks for the test results.

Faraday's Law (loosely) states that current is generated when a magnetic field moves across copper windings. The collapsing magnetic field is moving across the coil windings as it shrinks inward. Like a balloon: You blow air in, it expands. You release the air and it blows out the hole with a force.

They confirm everything I've been saying!

What they confirm is that you are wrong.

This force blows across the coil wraps from outward to inward. This is in the opposite direction from the initial field expansion.

It is also opposite to that which created it. This is where you are lost. Power was supplied to the inductor to create the magnetic field.Then the magnetic field returned the energy which created it in the first place.

Let me try and explain it this way Synchro.
Lets say a motor vehicle is our inductor,and the wheels are the current. The engine is our power in when the switch is closed. When we use the engine(power input) to move the car forward,which way will the wheels rotate. Now,we switch the engine off,and with the car stationary,we move the road backwards under the car-which way are the wheels rotating?. Thats right-in the same direction.

[citfta]

Synchro,

Let's take things one step at a time.  Which way does the current flow "inside" a battery?  Now which way does it flow outside of the battery.

[synchro1]

@Tinman,

"It is also opposite to that which created it. This is where you are lost. Power was supplied to the inductor to create the magnetic field.Then the magnetic field returned the energy which created it in the first place".

What is this some kind of attempt at burlesque?

[tinman]

Synchro

Please look at the diagram below,and note the scope probe placements.

Question 1- What wave form will be seen on channel 1-->an AC or DC wave form?.
Question 2- What wave form will be seen on channel 2-->an AC or DC wave form?