G'day all,

@one:  On the contary, back emf is essential to the operation of a NS battery. It is what gives you the AC in the secondary. Back emf (electro motive force ) is the result of a collapsing magnetic field in an inductor after the current and voltage has been removed. Yes it does change the charging characteristics of the inductor, or in this case the primary bifillar, but when you approach resonance there is little impedance to the charging in either direction.
When a magnetic field collapses quickly in an inductor a voltage and current is produced in the opposite direction. It's like reclaiming the energy from the first make and break cycle.
I am happy to give a deeper explaination if you wish.

Kind regards

Ian

double post

deleted

Quote from: ian middleton on March 30, 2008, 07:04:44 AM
G'day all,

@one:  On the contary, back emf is essential to the operation of a NS battery. It is what gives you the AC in the secondary. Back emf (electro motive force ) is the result of a collapsing magnetic field in an inductor after the current and voltage has been removed. Yes it does change the charging characteristics of the inductor, or in this case the primary bifillar, but when you approach resonance there is little impedance to the charging in either direction.
When a magnetic field collapses quickly in an inductor a voltage and current is produced in the opposite direction. It's like reclaiming the energy from the first make and break cycle.
I am happy to give a deeper explaination if you wish.

Kind regards

Ian

Thanks  Ian

My original  comment  on back emf was because I was trying  to follow  conventions  being followed  by  many others on this  site.   

Here is the   thread   .......the  video  is  only a few minutes and explanes  most of  it.   

http://www.overunity.com/index.php?topic=3247.msg66761

My  commment  about   people not really understanding it   was  intended  as general .    EE  people  tend to work  around  the voltage spilkes rather than   using them  to do useful work .
An example   is  a starter motor for  a car.      As far as I know  they  are still  ONE winding .    They  use one  winding  because  it  creates less  flyback .       Flyback tends to eat the comutator .     ( I don't think I am wording this right ,   If you  take  a starter apart  you  will find   one  flat conductor   on each  side of the rotor  .   The  conductor   is  close to 1/8in  thick and 1/2 in wide .  ...... the current  goes  around  this loop once . )

Because   most EE people in the past have worked around  the spikes rather than   harvesting them I feel it is a prime area  for  OU  reserchers

gary 

@Ian

Thanks for putting my tesla comment in contex.Ã,  What is interesting is that the power is self induced in this primary coil. I wonder how that effects the resistance.Ã,  In theory The Primary bifilar coil is a capicator of sorts which regains its charge each time after its shorted.Ã,  So in essence were just shorting the leads on a cap repeatedly.Ã,  and collecting the changing flux(ac) in the secondary coil. If we were to do lc calculations im curious how i would treat the wires as a cap for one part of the equation and and inductor for the rest.Ã,  Ã,  Ã,  Ã, 
Ã,  Ã,  Ã,  Ã,  Ã,  Ã,  Ã,  Ã,  Ã,  Ã,  Ã,  Ã,  Ã,  Ã,  Ã,  Ã,  Ã,  Ã,  Ã,  Ã,  Ã,  Ã,  Ã,  Ã,  Ã,  Ã,  Ã,  Ã,  Ã,  Ã,  Ã,  Ã,  Ã,  Ã,  Ã,  Ã,  Ã,  Ã,  Ã,  Ã,  Ã,  Ã,  Ã,  Ã,  Ã,  Ã,  Ã,  Ã,  Ã,  Ã,  Ã,  Ã,  Ã,  Ã,  Ã,  Ã,  Ã,  Ã,  Ã,  Ã,  Ã,  Ã,  Ã,  Ã,  Ã,  Ã,  Ã,  Ã,  Ã, Ã,  Joe



@Gary

Yes exactly it will eat the comutator unless it has a place to go ... like a cap and inductor in parallel to the motor but in series lc to eacheother

Quote from: Localjoe on March 30, 2008, 12:58:23 PM
@Ian

Thanks for putting my tesla comment in contex.  What is interesting is that the power is self induced in this primary coil. I wonder how that effects the resistance.  In theory The Primary bifilar coil is a capicator of sorts which regains its charge each time after its shorted.  So in essence were just shorting the leads on a cap repeatedly.  and collecting the changing flux(ac) in the secondary coil. If we were to do lc calculations im curious how i would treat the wires as a cap for one part of the equation and and inductor for the rest.       
                                                                                                                                           Joe

Joe

I am courious  about what would  happen  if the  windings  were  tuned to   the  same  inductance  and  a cap was placed  across  the 10 leads,,    could  there be a way to make this core  into  a self resonating  self  sustaining  electromagnet?


gary