Thane Heins Perepiteia Replications

[i_ron]

Well what I see is when a magnet is approaching a coil, the field 'delivered' to the coil becomes more and more until tdc is reached and amusing we have a steady motion and are operating below saturation you will see a voltage increase until tdc and when the magnet goes past that tdc the field change is happening again, but in reverse so, this time from high to increasingly low.

A single conductor is shown thus when passing through a steady field. But the point in question here is that of a magnet passing over a coil.

You can see the action in this animation, unfortunately it depicts a magnet entering into a coil but notice the peak in one direction then the fall to zero as the magnet stops... well in a coil with the magnet passing over the coil the same thing happens. The magnet generates a peak on approach and as the motion, from the point of view of the coil, changes then a zero induction occurs, then a peak as the magnet recedes.

http://micro.magnet.fsu.edu/electromag/java/faraday2/

Ron

[Pageygeeza]

@i_Ron:  Dude, do we have to draw them pictures?

[i_ron]

But the point in question here is that of a magnet passing over a coil.

Ron

Steven, Thane, and others, the great stumbling block with the voltage (peak of the sine wave) rising up at TDC is you are only accounting for one half of the sine. Your theory must have a south pole coming along next to generate the opposite half of the sine.

But the actual fact, and you can easily do this experiment, just one pole is generating BOTH halves of the sine wave.

Here is a little demo for you... I have taken an old rotor and put one magnet on it. I have spun it up in the lathe, as it doesn't mind being a little out of balance. You can see that one north pole in this case generates both halves of the sine!

I am afraid your theory doesn't account for this.

Observation:

A single pole generates both sides of the sine wave.

Conclusions: 

The positive going pulse in this case is generated as the magnet enters the coil and ramps down to zero at TDC. On leaving the coil a negative going pulse is generated.

Ron

Pageygeeza, a picture is worth a thousand words!

[derricka]

If anyone here is confused, let me shed some light on the situation.
For a purely inductive coil, Tinsel Koala and iRon are correct. (Voltage is zero at top dead center)

Thane is claiming voltage is not zero. This is because Thane's high voltage coils have a significant capacitive component, due to the larger number of turns. As the magnet approaches the coil, this capacitance is charging up, so at top dead center, there will be a voltage. The true circuit here, is much more like a LC circuit (or more accurately, RLC circuit), where voltage and current are no longer in phase (power factor).

http://en.wikipedia.org/wiki/LC_circuit

http://en.wikipedia.org/wiki/Power_factor

[LarryC]

I think you people are missing Thane's main point:

Thane quotes:

“THE IMPEDANCE HAS TO BE HIGH ENOUGH TO JUST "CHOKE" THE CURRENT AND CAUSE THE COIL TO ACT LIKE A CAPACITOR AND NOT AN INDUCTOR SO THE INDUCTIVE REACTANCE HAS TO BE HIGHER NOT LOWER.

THE RESISTANCE OF THE COIL SHOULD NOT BE TOO HIGH OR YOU WON'T GET A GOOD STRONG MAGNETIC FIELD WHEN THE COIL CAPACITANCE DISCHARGES.”

“I AM PUTTING THIS HERE SO PEOPLE WILL INDERSTAND HOW THE HV COIL CAUSES ACCELERATION.

AT TOP DEAD CENTRE I.E. "when the coil/core is directly over the magnet" THE MAGNET IS NEITHER APPROACHING NOR RECEDING FROM THE COIL/CORE AND THE INDUCED VOLTAGE IN THE COIL IS MAXIMUM.

IT IS ONLY WHEN THE MAGNET IS APPROACHING OR RECEDING AWAY FROM THE COIL/CORE THAT THERE IS IMPEDANCE (AC RESISTANCE) IN THE COIL AND MINIMAL CURRENT FLOW.

AT TDC THE INDUCTIVE REACTANCE IS ZERO (COIL'S FREQUENCY DEPENDANT AC RESISTANCE) AND THE COIL'S IMPEDANCE (INDUCTIVE REACTANCE + DC RESISTANCE) TO CURRENT FLOW DROPS TO THE DC RESISTANCE OF THE COIL.

SO NOW AT TDC WHEN THE INDUCED VOLTAGE IS MAXIMUM (NOT ZERO) AND THE COIL'S IMPEDANCE IS MINIMAL - MAXIMUM CURRENT CAN FLOW AND PRODUCE THE MAXIMUM DELAYED MAGNETIC FIELD REQUIRED TO PUSH THE NOW REDEEDING MAGNET AWAY WITH ADDITIONAL FORCE.”


From Wiki under parasitic capacitance:

For example, an inductor often acts as though it includes a parallel capacitor, because of its closely spaced windings. When a potential difference exists across the coil, wires lying adjacent to each other at different potentials are affected by each other's electric field. They act like the plates of a capacitor, and store charge. Any change in the voltage across the coil requires extra current to charge and discharge these small 'capacitors'. When the voltage doesn't change very quickly, as in low frequency circuits, the extra current is usually negligible, but when the voltage is changing quickly the extra current is large and can dominate the operation of the circuit.


Thane is maximizing the parasitic capacitance and it is discharging at TDC to produce the acceleration.


Regards Larry,

PS: just noticed that derricka beat me to it, but the parasitic capacitance observation is important.