Confirming the Delayed Lenz Effect

[ALVARO_CS]

Thanks Wings
reading the patent I realized, that I was wrong about the current flow direction,
as in the Tesla panckake the flow of current goes the same direction in paralel.
The drawing I posted therefore does not applies.

cheers
Alvaro

[synchro1]

Thanks Wings
reading the patent I realized, that I was wrong about the current flow direction,
as in the Tesla panckake the flow of current goes the same direction in paralel.
The drawing I posted therefore does not applies.

cheers
Alvaro

Net self inductance of the Tesla pancake is null. This applies to the linear spool Tesla bifilar configuration also. How can any other coil variety compete with zero value? Zerofossilfuel discovered that his "Wardencliff" coil equaled the pancake when he equaled the Ohm's. The same would most likely result in a balance if a twin Ohm Tesla bifilar were compared to the "Skycollector". The best Jorge can do is factor out again to null self inudctance, and 0=0!

When Skycollection alternates the coil directions, all the current paths cancel out, just like the single pancake. A plain Tesla bifilar with equal Ohms, same amount of wire, should equal it's self inductance and performance.

[ALVARO_CS]

hi Synchro 1
I have a doubt about this linear spool bifilar, may be you can clarify

has it got the same properties if winded as a common solenoid, that is winding the two strands back and forth along the spool,
or winding it half spool one strand CW and the other half CCW ? (connecting as the panckake)

[synchro1]

Look at this, and read the fine print. The coil looses it's resistance to change in current direction, as a consequence of the spontaneous high voltage charge that builds between the cross current windings.

[MileHigh]

If you make a coil that consists of 100 clockwise tuns plus 100 counter-clockwise turns, then you get self-cancellation.  The result is that the inductance is zero, and the coil looks like a length of wire.  It won't work as a pick-up coil, it will generate zero volts.  So it's not useful.

If you see people using coils like this in video clips driving LEDs, all that means is that the self cancellation is not perfect, and the coil still possesses a small amount of inductance and it can act like a very weak pick-up coil.  You must keep in mind that whenever you see a pick-up coil driving a load like a resistor or a light bulb or an LED, that the coil is creating drag on the rotor, even if it is not readily apparent when you watch the clip.  It should show up on a tachometer.

I am going to guess that Tesla made the bifilar coil as a self-resonator to store energy temporarily because it is a high-frequency tank circuit.  It looks like a coil in parallel with a capacitor.  It may have its uses in certain applications.

As an idea for the testing for the delayed Lenz effect, there is another simple setup that could be interesting.  Assume that you have a rotor with four magnets spaced 90 degrees apart.  You put a sensing coil that's 90 degrees offset from the pick-up coil.  Make the sensing coil approximately the same shape as the pick-up coil.  Connect your top scope channel to the sensing coil.  That is your timing reference and your scope triggers on that signal.  Look at the voltage waveform and see the positive hump, the zero-cross, and the negative hump.  You know that the zero-cross is top-dead-center.  So you can look at the waveform on your scope and visualize the magnet approach associated with the first hump, and the magnet retreat associated with the second hump.

Let's assume that the motor's speed stabilizes.  You can switch your scope to a variable time base and line up exactly eight major horizontal divisions on your scope display to go from one zero-cross to the next zero-cross.  Since eight major divisions represents 90 degrees of rotation for the rotor, each major division represents 11.25 degrees of rotation for the rotor.   If you line up the two zero-crosses to span nine major divisions, then each major division on your scope display will correspond to exactly 10 degrees.

Connect your bottom scope channel to the pick-up coil output, where you have a load resistor connected.

So here is what you get:  The top channel of the scope gives you a timing/angle reference for where the magnet is as it passes by the pick-up coil.  The bottom scope channel is showing you the current waveform in the pick-up coil.  If you are looking for a "delayed Lenz effect," if I understand this correctly, that means you are expecting to see the current flow though the pick up coil to be delayed.  Can you see the speculated RC time-constant that delays the onset of current flow like some people allege?  So this would be a good test to run.

How to measure the current flow through the shorted pick-up coil is another interesting problem.

MileHigh