Thane Heins Perepiteia Replications

[derricka]

I agree, the gif image clearly says generator, as opposed to alternator.
The commutator effectively takes the negative right hand portion of iRons oscilloscope
trace, and flips it upward, to show the rectified sinewave output, shown in Thane's image.

http://en.wikipedia.org/wiki/Commutator_(electric)

[i_ron]

I agree, the gif image clearly says generator, as opposed to alternator.
The commutator effectively takes the negative right hand portion of iRons oscilloscope
trace, and flips it upward, to show the rectified sinewave output, shown in Thane's image.

http://en.wikipedia.org/wiki/Commutator_(electric)

I am not making this up you know... it is just that there is all kinds of info on "conventional" generators but little on pulse coil generation... until you look with the proper criteria...

"Now we come to an important feature of a coil when it is used as a SENSOR.
When a magnet passes a coil (this includes the action of moving towards or away from a coil), a voltage is generated in the turns in the form of a sinewave.

The same type of waveform is produced if the magnet passes the end of the coil, into and out of the end of the coil or if the magnet passes through the centre.

The first is the voltage produced by the coil as it passes the end of the coil.
When the magnet is directly opposite the end of the coil, the change in magnetic flux is zero and thus the voltage produced by the coil is zero.
The second point is the change in voltage produced by the coil. The output voltage changes from positive to negative during the very small portion of excursion when the magnet moves from a forward to reverse direction as seen by the end of the coil."

http://talkingelectronics.com/projects/Inductor/Inductor-3.html


Ron

[TinselKoala]

I am not making this up you know... it is just that there is all kinds of info on "conventional" generators but little on pulse coil generation... until you look with the proper criteria...

"Now we come to an important feature of a coil when it is used as a SENSOR.
When a magnet passes a coil (this includes the action of moving towards or away from a coil), a voltage is generated in the turns in the form of a sinewave.

The same type of waveform is produced if the magnet passes the end of the coil, into and out of the end of the coil or if the magnet passes through the centre.

The first is the voltage produced by the coil as it passes the end of the coil.
When the magnet is directly opposite the end of the coil, the change in magnetic flux is zero and thus the voltage produced by the coil is zero.
The second point is the change in voltage produced by the coil. The output voltage changes from positive to negative during the very small portion of excursion when the magnet moves from a forward to reverse direction as seen by the end of the coil."

http://talkingelectronics.com/projects/Inductor/Inductor-3.html


Ron

Yep, and inspection of the Faraday law of induction or the Maxwell-Faraday vector equation, shows that as the field is increasing (magnet pole approaching coil) the polarity of the induced voltage is one way, and as the magnet comes to TDC (point of closest approach) the induced voltage is zero, and as the magnet recedes from the coil the polarity is now opposite.  Just like the oscilloscope trace shows from i_ron's experiment. Just imagine how the flux lines look at a loop of the coil. Constant=zero voltage. Increasing lines=voltage in one polarity. Decreasing lines=voltage the other polarity.

But the point about the phase of the voltage in the circuit being affected by parasitic (and other) capacitance is a good one. Unfortunately the amount of capacitance necessary to achieve the effect claimed varies as the frequency, that is, it must be tuned to the speed of the magnet's passage, to achieve the "choke" and kickback effect. I think.  Maybe.

[Nali2001]

So a wheel with opposite polarity magnets will give you 'M' shaped waves instead of ac.

[slapper]

Isn't it current that creates the magnetic field?

Another question I have is; is there any coil winding configurations that are better than others as far as delaying the current yet provide for a strong reactive field? Since high voltage coils do the trick they generally are higher in
impedance.

Take care.

nap