Circuit setups for pulse motors

[hoptoad]

@Artic
quote ...
im very confused about back emf and cores now..........
and now there is 2 different descriptions of back emf, if they are the same please let me know..........

Its easy to be confused when common textbooks use the words back emf to describe two different phenomena. Yes, there are two different forms of back emf. To avoid confusion there are other names used to descibe the two forms.

1. Back EMF (Counter EMF) is normally only associated with an electric motor. It arises in opposition to the Applied EMF (your current source) when the motor is on and running.

This form of back emf occurs, because the rotor, as it turns, acts like a generator, but with opposite polarity to the applied voltage. If the back emf was equal to the applied emf, the motor would continually stall. But the beck emf is always less than the applied emf, so the motor will turn and continue to run. This is true of ALL motors.

2. Back EMF (Collapsing EMF). Also known commonly as "fly back". This can occur in any type of pulsing system, but only if there is inductance in the circuit.

This form of back emf is caused when the current which is flowing through the coil is suddenly turned off. The magnetic field of the coil collapses, and induces a voltage potential which is opposite in polarity to the original applied voltage. This potential can be transformed into usable power in the form of either electricity, mechanical torque, or a combination of both. Tapping this form of back emf for re use can be successfully achieved in numerous ways.

Cheers all

[hoptoad]

P.S. @All, in reference to my last post
Back EMF (1.)  also known as Counter EMF is "Counter Productive"
Back EMF (2 )  also known as Collapsing EMF is "Collectible"
It also becomes less confusing if you apply the alternative names for each type of emf, all the time.

Cheers all 

[Artic_Knight]

ok so this isnt going to change me proving it for myself but has anyone tried a positive attraction and with the collapsing magnetic field repulsion on the magnet to push it away?

seems to me if you positively attract a magnet first and then in dead center of the iron core stop the current it should stay on the iron core, of course unless its actually creating this reverse repelling force then it will drive the magnet away.

on a side note you will find a picture from the adams page, now according to the page if you connect A and B you will get the back emf. if the current is reversed then you need the negative pole or collector of the cap at A and the positive at the diod B and this is supposed to catch flyback but if it does then you dont need the diod, if it does catch the back emf it will also collect the battery power because nothing is blocking it, shouldnt the drive curcuit be between the powersource and A on the positive side?  and for "flyforward" or normal current you connect B and C now the negative or collecter should be on C and the emmiter going to A if you do not want it reused right away and stored for another pulse right?

my understanding of the back emf is that the electric current reverses and by this diagram and some miricle i now think i understand how to collect it.

but the reversing of the magnetic fields... that doesnt sound right.  mind you im not saying its not possible cause i have started to see many things in modern science that were not possible 6 years ago and now the very same people are going "look what i made!" funny, i could have told you back when it wasnt possible how to make it like a rail gun. just use powerful ac coils  

any hoot thanks for being patient and assisting me with this!

[hoptoad]

@Artic

quote.....  but the reversing of the magnetic fields... that doesnt sound right.....

When the applied coil current suddenly ceases, The magnetic field doesn't reverse, it collapses and induces an opposite voltage potential at the collector which is connected to point B via an output diode. When this potential is directed via the diode and a load (usually) back to point A, it forms a current loop within the coil, the diode and a load. The current flows in the same direction though the coil as the original applied current.

This causes the magnetic field to collapse slowly instead of immediately, as the recirculating current maintains a degree of magnetic strength for some time after the applied voltage and current has been turned off.

The + ve of the collapsing field voltage occurs at the collector and current goes from collector through diode to point B which is now a decoupled +ve with reference via a load to point A, (for fly back) and a higher value decoupled +ve (for fly forward) with reference via a load to point C. In both instances, the positive of a capacitor or battery load should be connected to point B as shown in fig 7 on page 3. on my site

In all instances, the current through the coil itself, will be in the same direction. (if you've wired it correctly) 

The diode must be inserted between the collector and the load  (in the circuit shown), or the load will simply be in parallel with the drive coil (fly back) or in parallel with the switch (fly forward). In both cases, without a diode to decouple the output, the result will be poor performance at best, or a blown transistor Mosfet switch at worst. Both no no's 

Cheers from Hoptoad 

[Artic_Knight]

for flyback:
so if you have a negative potential at point B and the diod is allowing flow in which direction? from the coil to point A? then the only flow i can see is the unused electricity or potential work still available in the curcuit to get resycled which you referr to flyforward. if its negative then the positive current or the direction its flowing is back at the + pole of the powersource the other direction? ive never heard of a negative value moving in the positive direction. i will try it dont get me wrong! but i just dont see it! my grandfather is a electronics inventor and based on his teachings which are partly text book part trial and error he has never heard of such a feat.  it wont cost me anything to try since i will be using a breadboard i can just shuffle the curcuits around.
seems to me whith that kind of set up the cap would become charged from the powersource and never fire since the diod will not permit the reverse in direction.

this is baffleing but thank you for the time you have spent with me.


EDIT:   wait i see what your saying! but im not sure if a "collapse" is the best way to describe it!   ok so the electrical current is fed in from the - end to the + end of the coil this makes a magnetic flow that moves from - to + now when you stop feeding it the leftover magnetic current is funneled back into the coils going in the same direction from -to + so essentially the magnetic current is obsorbed back into the coils and if it was normally induced into them. ok! now there isnt a need for a cap since your going to route the current directly back into the coil to let the natural resistance of the coil wear it down slowly, so you connect via a wire piont B to point A right? the diod lets all positive current flow more directly back to the coil keeping its polarity for longer requiring a shorter pulse draw from the power sorce reducing AMPs.   right? when everyone was talking about a collapse i was thinking the magnetic current reversed. but thats what i read on the origional adams motor! hmm, thats what doesnt make sense and thats where the confusion is coming from, how is this "collapse" reversing the magnetic flow and having power to "push" the magnet away? seems to me its just cutting off and letting the magnet fly right by!