I got one simple question which i'm sure you will find easy to answer.
Namely, if we feed transformer with pulsed DC, output is AC as demonstrated here:
https://www.youtube.com/watch?v=WZSN2ybEUqg
and here
https://www.youtube.com/watch?v=A4uZUMsaYWM
What's confusing me is this...
How do we explain this in comparison with alternator..
View attachment 154126
Lets say north pole of rotor magnet approaches the coil and voltage reaches the peak as it comes closest to the coil. As it starts moving away voltage drops and reaches 0. This is first half-cycle.
Then south pole starts approaching and voltage rises in opossite direction, then falls to 0 and cycle repeats.
Now... Same thing happens in transformer, only solid state.
Feeding pulsed dc to the primary is the same as if alternator's rotor poles are both north or both south, each time they pass near the coil they induce voltage in same direction.
So if this action would produce pulsing DC in a generator, why does it produce AC in a transformer?
I think question is clear, but if it's not i will gladly clearify.
This is electromagnetics 101, and an entirely different thread.
Any varying magnetic field will create a corresponding varying current in a conductor.
This explanation should be enough to explain all of your queries.
Since there appears to be no answer, I will try ...Feeding pulsed dc to the primary is the same as if alternator's rotor poles are both north or both south, each time they pass near the coil they induce voltage in same direction.
Since there appears to be no answer, I will try ...
I will start with - I disagree with your above assumption.
AC Alternator ...
When the North Pole of the rotor passes by the coil,
the motion is always in one direction - the rotation of the rotor.
Causing the "+" half cycle voltage in the coil to increase to max voltage, then falls back to zero volts.
Then the passing of the South Pole, which causes the opposite max "-" half cycle voltage, then fall back to zero volts.
Pulsed DC Transformer ...
When the primary coil is "charged" to max current ...
the magnetic field expands and then stops expanding, causing the secondary voltage to "+" max voltage and then falls back to zero.
When the primary coil is "discharged" to zero amps ...
the collapsing magnetic field reverses direction and returns to zero flux, causing the secondary voltage to "-" max voltage and then falls back to zero.
The rotor moving the North Pole past the coil is equivalent to increasing the amps in the primary of the transformer = "+" half cycle
The rotor moving the South Pole past the coil is equivalent to decreasing the amps in the primary of the transformer = "-" half cycle
It is this reversal of direction of the magnetic flux in the transformer that is different than an AC Alternator spinning in one direction.
That You-Tube video is of a DC Generator, not an AC Alternator with magnets on the rotor.
In an AC Alternator ... as the North Pole is leaving the stator coil, the following South Pole simultaneously approaching the coil.
OK, I see now that it is not a commutator but two slip rings = AC generator.
Initially, the video does not show the alternating current - which is wrong and very confusing!
Finally at time 46:43, the video does show that the current flips to the opposite direction, once every 180° = once per N-S pair = 1/2 cycle of voltage
Do you see the Voltage reversing in your latest You-Tube video?
As the armature spins through one N-S pair, the current reverses in the next S-N pair.
The magnets are in N+S, S+N, N+S pairs on an AC rotor, like you showed in message #1, and also N-S Pairs in the stator like your latest video
From time 45:33 until 46:08 in your You-Tube video, the armature is spinning but the Arrows are not changing direction.
That is very wrong & very misleading.
Finally, at time 46:09, the video shows an actual Voltage reversal.
Initially, I was only answering your question regrading your confusion here ...
Feeding pulsed dc to the primary is the same as if alternator's rotor poles are both north or both south, each time they pass near the coil they induce voltage in same direction.
I was not discussing WHEN the Voltage flip occurred, only that the voltage does flip with each N-S pair.
You first elaborate what is incorrect in the video.
I already did. See my post #16
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