Secret Of Back EMF

[SeaMonkey]

Rather than "shorting" the input to the capacitors,
why not disconnect the capacitors instead?

By shorting the kickback the magnetic field which
is producing it is prolonged within the motor.  It
may be that is what is reducing the motor speed and
causing a higher than normal current flow.

In some pulse operated motors a diode is placed
across the motor leads to "short" the kickback
which actually increases motor efficiency by
prolonging the current produced magnetic field.

[forest]

Ok. I really WANT somebody experienced to clear the difference and explain this topic.
For my simple mind there are two effects in play : let's call the first one " backEMF" rather COUNTER-EMF and the second one rather FLYBACK SPIKE. Am I right ?
CounterEMF is what I see as effect of self-inductance motors coils and I heard it limits the voltage applied to motor coils, because it is in oposite to applied power source voltage polarity.

Is this is correct then :

1. How is that everytime it fights against applied power ? Is that a matter of  arrangements of coil ?
2. What would happen if counterEMF in motor coils will be very small ? Would that burn out wires inside motor ?

[MarkE]

Hopefully this diagram will clear things up.

[tinman]

Ok. I really WANT somebody experienced to clear the difference and explain this topic.
For my simple mind there are two effects in play : let's call the first one " backEMF" rather COUNTER-EMF and the second one rather FLYBACK SPIKE. Am I right ?
CounterEMF is what I see as effect of self-inductance motors coils and I heard it limits the voltage applied to motor coils, because it is in oposite to applied power source voltage polarity.

Is this is correct then :

1. How is that everytime it fights against applied power ? Is that a matter of  arrangements of coil ?
2. What would happen if counterEMF in motor coils will be very small ? Would that burn out wires inside motor ?

BackEMF(counter EMF) limits the voltage in the motor coils(as you call them forest),and thus limits the current. The lower the Back EMF,the higher the current draw.

Inductive kickback(or fly back) is when a powered inductor has it's power source cut off quickly(becomes open circuit).The current wants to maintain its flow as the magnetic field around the inductor collapses. Now while the voltage potential inverts from powered to non powered across the inductor,the current flow remains in the same direction. This is the very reason the Bendini ssg has the charge battery negative hooked to the run battery positive,as the positive becomes the negative potential when the inductor becomes open(transistor becomes open).

From what i can make out in Tommeys setup(a bit hard without a schematic),is the reason the motor bogs down when he shorts out the caps,is because he has created a continual loop in the motors inductors(coils).This being the case,the current has no where to go but back into the coils,and this would maintain the magnetic field around the coils,and in turn would be what is bogging the motor down,and drawing the extra current. Inductive kickback(fly back) is not free energy,but is what is left over from the supplied power that the motor(and all its losses) didnt use(convert).

[tinman]

Hello all,

If you think Back EMF is not something special, look what happens when you use a transformer and DC pulse.

https://www.youtube.com/watch?v=Ty5CLgjmd4c

Tom

Tom-you made an inverter.
And it's inductive kick back or fly back-not back EMF.