My question is as we know v proportional to I can be used a resistor to increase voltage drop and reduce current amore loss can be covered in terms of flux in the winding except the heat dissipation is more.
No. The current is collapsed when the points open, which causes a change in Flux that in turn will cut across the secondary coil and cause current to flow producing a very high voltage. The points while closed ground the primary circuit. Remember, the breaker points and the condenser are wired in parallel.
you should always repeat a student's question before answering, so other students in the classroom, and in this case a virtual classroom, know what it is you are addressing...
+slowpoke96z28 You have made an excellent point. A slow verbal repetition is a valuable tool to re-enforce learning. Pacing is another. A slower student can usually handle a course of study IF he/she is led at a pace that will allow them to grasp basic principles. If you want to watch an amazing instructor walk you through the operation of radio, using a diagram, watch and listen to the pacing of "AA5 Radio Signal Flow" by AllAmericanFiveRadio here on YT.
That is helpful, thank you I will be showing this video to a lot of my students. I appreciate your response and have subscribed to your channel. Thanks again
Great!! Please do use it, makes the hard work worth it! :) I am not longer teaching AMT courses, but you could make your own videos using the iPad and the Doceri app. It was very helpful to me for explaining circuits. I'd be happy to help if you have any questions about it.
Would you still get a spark if the rotor runs in the opposite direction, I have an application where I would have to run the rotor with the arrow running the opposite way? Thanks
yes it will run either direction, Two things. 1. you need to set the internal timing to reflect a direction change ( e-gap timing is based on specific direction of rotation) both bendix and slick allow for direction changes. Some engines have counter rotating mags. so you can use one magneto model. Second, if you have an impulse coupling attached that will need to be changed out
Well I already knew if you pass a magnet thru a coil it produces a electrical current thru primary coil secondary coil steps up high voltage and causing spark plug to fire.
Thanks Brian, we talked about capacitors in a different lecture, I think. The capacitor has two purposes: to prevent arcing of the points and to help the primary flux field collapse more quickly. As the primary field collapses, Lenz's law is in effect and would try to "push" the current across the points - the capacitor absorbs that energy to prevent arcing. At the same time, that is what helps the flux field collapse rapidly, which is crucial for making a hot spark. Hope that is helpful.
+Brian Lorenz : From the diagram the Capacitor is in parallel with the movable contacts(points). When points OPEN an electrical arc results between the two contact surfaces as they separate interrupting current flow. The capacitor being in parallel, across the points, becomes an alternate path as points open. One side of the capacitor is grounded thru its case. The other capacitor plate will readily accept a charge(positive) (opposite charges attract) to its grounded plate. As point separation distance increases, air gap increases building resistance until arc is extinguished. Positive capacitor plate being the alternate path will continue to charge up until charge density (depends on plate area) builds to the value of repulsion and stops charge. (Like charges repel). This capacitor action limits arcing at points extending life providing circuit protection to inhibit arc erosion and pitting. When points CLOSE to repeat cycle the charged up positive capacitor plate is at a higher potential than ground and discharges injecting into the circuit being at a lower potential. This action(closing points) also bleeds capacitor plate in preparation for next operation (opening).
as flickchaser was sayin the cap provieds an alternate path and circuit protection, when the current changes direction the flux needs a place to go, the cap provides a path to ground. a frown is a negative, the curve is negative in an electrolytic capacitor. negative curve the straight line is positive.
Only one is used depending on the rotation of the magneto. Right rotation or left rotation of course. The egap will be set using the right rotation slot on the rotor magnet for a right rotating magneto and vice versa.
When the points open they do not immediately stop current flow. This is because when they are a tiny bit open the electricity will arc through the air from one point to the other. This is a problem which causes pitting and other erosive damage to the points. To avoid this the current is given an alternative path, i.e. the capacitor. To put it simply, the capacitor prolongs the life of the points by preventing arcing.
this drawing is incorrect imo, the primary and secondary winding are in a coil together, drawing them apart on opposite sides of the field frame will confuse u when u actually open up a magneto.
CrazyForCooCooPuffs Typically schematics depict the circuit from a theoritical point of view, enabling ease of modelling/calculation, while the individual component spec's would actually detail the physical construction . The coil is actually a transformer and it just happens that the windings are wound together, however they need not be. This diagram is drawn the way every electrical engineer would draw it. Think of schematics as the language that electrical engineers use to describe their circuits. Hope this helps
CrazyForCooCooPuffs Typically schematics depict the circuit from a theoritical point of view, enabling ease of modelling/calculation, while the individual component spec's would actually detail the physical construction . The coil is actually a transformer and it just happens that the windings are wound together, however they need not be. This diagram is drawn the way every electrical engineer would draw it. Think of schematics as the language that electrical engineers use to describe their circuits. Hope this helps
Depends how its being used. A CDI a capacitor is charged then voltage sent to plug for spark. In an inductance coil, a capacitor is used when the primary coil emf is discharged quickly and it keep the points from burning up. So there is to ways in two different scenarios it is being used.
Mr Thompson though sadly eschews the opportunity to educate one and all regarding the use of the capacitor. You are correct Mr Dean. But overlooked often is the fact that the capacitor allows the fast extinguishing of the arc across the point contacts, as you mention, helping it to not burn and last longer. But this fast shutting down of the current flow makes the magnetic field collapse in a quicker manner, causing a higher amount of energy to be available and hence a hotter spark. As the contacts open, the energy is enough to start to turn the intervening air into a plasma, which is much more conductive than air, as the contacts continue to open this arc of plasma continues to be drawn out creating the "long" spark. The condenser absorbs this sharp pulse of energy, not allowing the plasma to be drawn out nearly as long, as the energy is sapped by the condenser/capacitor much more quickly and sooner. This is a reason a dickie condenser can cause a piss poor spark. Or no spark
The capacitor has two purposes: to prevent arcing of the points and to help the primary flux field collapse more quickly. As the primary field collapses, Lenz's law is in effect and would try to "push" the current across the points - the capacitor absorbs that energy to prevent arcing. At the same time, that is what helps the flux field collapse rapidly, which is crucial for making a hot spark.
Great insight ! Thanks for posting this lesson! I just want to point something out. I think that for the sake of simplicity, you have OVERLOOKED 2 laws and the role this CAPACITOR plays in this schematics. Firstly, at 4:21, as the rotor spins in a clockwise direction, the N pole has approached the core, therefore the flux increased to a max. According to the Right-Hand Corkscrew Rule, Lenz's Law, and considering the winding direction of the Primary coil, the current direction through it should have had a ClockWise direction, but in the video its represented in reverse. Moreover at 6:09, though the primary induced flux and rotor flux superimpose (vectorially add), according to Lenz's Law, as the N pole was approaching the yoke, the induced flux in the coil should oppose the core flux change through the primary, not the other way around as depicted in the figure. Secondly, at 7:29 the rotor magnetic flux lines are wrongly represented, because they ALWAYS point from the N to the S pole and never from S to N (as long as you are outside a magnet or a coil). They should have had a CounterClockWise direction through the core. Fortunately here, the direction of current through the primary is the right one. Thirdly, in order to obtain a very HIGH VOLTAGE in the secondary, we need a GREAT FLUX CHANGE through the core (implicitly secondary coil), because the greater the flux change the greater the voltage obtained. Therefore, besides collapsing the flux in the primary, we ALSO REVERSE the current direction through it, obtaining a GREATER FLUX DECAY through the primary, and this is exactly what the capacitor does. A capacitor always opposes a build up in voltage by charging itself. The contactor circuit here shortens both the primary coil and the capacitor. Let's assume the rotor starts from Full Register, with N in the left, rotating clockwise. The capacitor opposes the build up of the induced voltage in the primary by charging up, and immediately after the circuit opens (10 degrees after Neutral, EGAP), the capacitor is no longer shortened by the contactor, so it discharges solely through the primary coil. Keep in mind, that any collapsing magnetic field through a coil, give rise to a self induced current through that coil. In our case, the self induced current due to the collapsing magnetic field is opposed by the capacitor current through the primary, thus hurrying up the collapse (according to the Right-Hand Corkscrew Rule) ! In other words, the capacitor only forces a reversed current through the primary, to oppose the selfinduced one, in the end accelerating the collapse of the induced magnetic field. This happens very quickly, right after 10 degrees past Neutral (EGAP). At this point, the CHANGE of the rotor magnetic field in the core is just below peak value, which means the EMFs generated in both the primary and secondary coils are just below maximum. Also, the CHANGES in the rotor magnetic field and the collapsing primary field have the same directions (very important)! As the two magnetic fields have the same direction of change, they will superimpose, thus give rise to a LARGE FLUX CHANGE through the core, implicitly through the secondary coil. This is like a spike in the magnetic flux change through it, leading to a very high EMF at the ends of the secondary, which translates in a spark obtained at the sparkplug. Moreover the capacitor and primary coil form a tuned LC circuit. All this starts when the EGAP commences and up to the point when N reaches the yoke (Full Register position), the superimposed flux change being large enough to create the spark. th-cam.com/video/OMLSNwQiiKg/w-d-xo.html th-cam.com/video/EcIECFajuJU/w-d-xo.html th-cam.com/video/lWyn_eV-DzM/w-d-xo.html&t
I dont think the capacitor can charge when the points are closed (cap is effectively shorted). The cap and primary coil form an LC tuned Tank circuit that electrically oscillates for a while when the points open, producing a 'ringing' current in the primary to create the hottest spark possible after step up.
@@HomebuiltHELP it is true, though the short circuit has a very small resistance, even so, the capacitor charges very very little, but immediately as the EGAP commences, the collapsing magnetic field through the primary charges the capacitor for a very small amount of time, after which, the capacitor starts discharging through the primary, creating that reversed current, thus accelerating the field collapse (and even reversing it a little). You are also right, the purpose of the capacitor being to create a tuned LC circuit, but what does the ringing current mean?? Can you explain the entire process in more detail, right from the start, please? I would really appreciate your opinion. For a good insight, I recommend watching this video too, though the system differs a little: th-cam.com/video/OMLSNwQiiKg/w-d-xo.html th-cam.com/video/EcIECFajuJU/w-d-xo.html th-cam.com/video/lWyn_eV-DzM/w-d-xo.html&t
@@BaldurKhr If you look at the primary voltage waveform at the time of collapse (using oscilloscope) you will see the recognizable 'ringing' due to the capacitor. This result is telegraphed to the secondary as a much hotter spark. I saw an ignition demonstration of the spark using a capacitor and then leaving it out. Quite a difference! Glad to see that video you recommended explaining that the capacitor had a 'secondary' benefit of reducing the spark at the points.
@@HomebuiltHELP Great pointing the ringing effect out. I will search for it in more detail 'cause it's very interesting. All I wanted was to try giving an easy to comprehend explanation of the presence of the capacitor in the circuit, so that anybody may form an idea of how it works. Thanks so much for adding to our collective knowledge! It's a great joy for me to talk to passionate people! I definitely improve my understanding, thanks to people like you!
Lines of magnetic flux only create current in relation to a moving conductor, OR conversely fixed conductor and moving lines of flux/field lines. The lines of flux only move when the field is building and collapsing. As there is no physical relational movement between the two. Indeed as happens in an ignition coil and also in any transformer, and the reason one can only have an AC transformer traditionally. The voltage has to vary, or the magnetic field remains static and no current will therefore be induced and flow. If one moves the things physically, IE, coils and magnetic field moving in relation to one another, in order to move the electrons and hence achieve current flow, one then has created either a generator or motor.
I understand that the condenser's purpose is to absorb primary current to prevent a spark arcing the points as they open so they don't burning out the points. However I don't quite understand how a defective condenser that does not hold the it's rated charge causes a weak spark or no spark at all in the secondary. Is there a condition where the condenser fails and the points don't burn out? Electrically how many different ways can a condenser fail besides not holding a charge?
GMM PA I have seen older auto engines run without a condenser but heavy arcing at the points occur. But in a fault condition...ie..if the condenser is internally defective (internally grounded) then a constant ground will be in effect due to it being bolted or attached to the metal ,this will short the primary current to ground through the case or body of the capacitor.(path of least resistance) bypassing the breaker points,.with no primary current=no secondary current. A functioning condenser (capacitor) will charge up(when points open) then resist or block further DC current flow, when points close it will discharge to repeat the cycle again.
Thank you for the video. The capacitor is used to store the charge, not dissipate it. When the points close, it charges the capacitor, when the points open, the charge that was stored in the capacitor is discharged through the coil, and released to the distributor. There is something wrong with the schematic.
Ive done a video that covers this in more detail including how magneto timing advance works and live scope voltage patterns th-cam.com/video/Iw85e1a8jO4/w-d-xo.html
What is the sense of asking if there are any questions if she does not want to answer any questions yet? She should just go through the theory of operation entirely and THEN ask if there are any questions.
in the video you mention that p- lead is not a wire , i think it is a wire .... the P-LEAD is the shielded wire that connects the magneto to the mag S/w in the cockpit , if this lead breaks , the ignatian may always be HOT with the engine
She knows this, what she is saying is that the particular line in the diagram is not a wire but a pointer showing what the label “p-lead” is referring to. The p-lead wire is under the one she is talking about. It’s kind of foolish to assume she doesn’t know what she’s talking about, when’s she’s probably teaching A&P applicants.
All need to be careful, this is not a standard Magneto, they do not need battery to operated and there is no primary and secondary. Actually, this should not be called an aircraft magneto. Also this person has no clue. Having points and a rotating magnet in this drawing is not doable.
It always drives me crazy when an "expert" in the audience wants to point out exceptions before the rules are explained.
Like a thunder stealer
I’m loving these excellent information videos, manny thanks 👍
Great explanation. Thank you!
Amazing explanation. I love it.
thanks for this great video. simply and easy
My question is as we know v proportional to I can be used a resistor to increase voltage drop and reduce current amore loss can be covered in terms of flux in the winding except the heat dissipation is more.
*WELL EXPLAINED MAKING IT UNDERSTOOD, THANKS FOR THE HELP! ;-)*
nice info, great for tractors and lawn mowers. thanks. :)
i think when the contact breaker is open then current is induced in condenser which stops the back flow of emf
No. The current is collapsed when the points open, which causes a change in Flux that in turn will cut across the secondary coil and cause current to flow producing a very high voltage. The points while closed ground the primary circuit. Remember, the breaker points and the condenser are wired in parallel.
Excellent information
This is a helpful video!
you should always repeat a student's question before answering, so other students in the classroom, and in this case a virtual classroom, know what it is you are addressing...
+slowpoke96z28 You have made an excellent point. A slow verbal repetition is a valuable tool to re-enforce learning. Pacing is another. A slower student can usually handle a course of study IF he/she is led at a pace that will allow them to grasp basic principles. If you want to watch an amazing instructor walk you through the operation of radio, using a diagram, watch and listen to the pacing of "AA5 Radio Signal Flow" by AllAmericanFiveRadio here on YT.
+Flickchaser thanx, I'll check it out...
Great video!
That is helpful, thank you I will be showing this video to a lot of my students. I appreciate your response and have subscribed to your channel. Thanks again
Great!! Please do use it, makes the hard work worth it! :) I am not longer teaching AMT courses, but you could make your own videos using the iPad and the Doceri app. It was very helpful to me for explaining circuits. I'd be happy to help if you have any questions about it.
Would you still get a spark if the rotor runs in the opposite direction, I have an application where I would have to run the rotor with the arrow running the opposite way? Thanks
yes it will run either direction, Two things. 1. you need to set the internal timing to reflect a direction change ( e-gap timing is based on specific direction of rotation) both bendix and slick allow for direction changes. Some engines have counter rotating mags. so you can use one magneto model. Second, if you have an impulse coupling attached that will need to be changed out
at 7:43 the secondary flux shouldn't oppose to the primary flux? thanks for the explanation,
Well I already knew if you pass a magnet thru a coil it produces a electrical current thru primary coil secondary coil steps up high voltage and causing spark plug to fire.
Very good video but i wish you had explained the purpose of the capacitor as well.
Thanks Brian, we talked about capacitors in a different lecture, I think. The capacitor has two purposes: to prevent arcing of the points and to help the primary flux field collapse more quickly. As the primary field collapses, Lenz's law is in effect and would try to "push" the current across the points - the capacitor absorbs that energy to prevent arcing. At the same time, that is what helps the flux field collapse rapidly, which is crucial for making a hot spark. Hope that is helpful.
+Brian Lorenz : From the diagram the Capacitor is in parallel with the movable contacts(points). When points OPEN an electrical arc results between the two contact surfaces as they separate interrupting current flow. The capacitor being in parallel, across the points, becomes an alternate path as points open. One side of the capacitor is grounded thru its case. The other capacitor plate will readily accept a charge(positive) (opposite charges attract) to its grounded plate. As point separation distance increases, air gap increases building resistance until arc is extinguished. Positive capacitor plate being the alternate path will continue to charge up until charge density (depends on plate area) builds to the value of repulsion and stops charge. (Like charges repel). This capacitor action limits arcing at points extending life providing circuit protection to inhibit arc erosion and pitting. When points CLOSE to repeat cycle the charged up positive capacitor plate is at a higher potential than ground and discharges injecting into the circuit being at a lower potential. This action(closing points) also bleeds capacitor plate in preparation for next operation (opening).
so how does that help in collapsing the field faster?
as flickchaser was sayin the cap provieds an alternate path and circuit protection, when the current changes direction the flux needs a place to go, the cap provides a path to ground. a frown is a negative, the curve is negative in an electrolytic capacitor. negative curve the straight line is positive.
They missed the explanation of the capacitor and why it's needed.
xfmr steps the voltage up
Just want to ask? If how many efficiency ( E gap ) position there is.
Is it 1 in normal flow & 1 in opposite direction, Thank much..
Only one is used depending on the rotation of the magneto. Right rotation or left rotation of course. The egap will be set using the right rotation slot on the rotor magnet for a right rotating magneto and vice versa.
Well taught
What purpose does the Capacitor serve wired parallel to the point gap?
When the points open they do not immediately stop current flow. This is because when they are a tiny bit open the electricity will arc through the air from one point to the other. This is a problem which causes pitting and other erosive damage to the points. To avoid this the current is given an alternative path, i.e. the capacitor.
To put it simply, the capacitor prolongs the life of the points by preventing arcing.
this drawing is incorrect imo, the primary and secondary winding are in a coil together, drawing them apart on opposite sides of the field frame will confuse u when u actually open up a magneto.
CrazyForCooCooPuffs Typically schematics depict the circuit from a theoritical point of view, enabling ease of modelling/calculation, while the individual component spec's would actually detail the physical construction . The coil is actually a transformer and it just happens that the windings are wound together, however they need not be. This diagram is drawn the way every electrical engineer would draw it. Think of schematics as the language that electrical engineers use to describe their circuits. Hope this helps
CrazyForCooCooPuffs Typically schematics depict the circuit from a theoritical point of view, enabling ease of modelling/calculation, while the individual component spec's would actually detail the physical construction . The coil is actually a transformer and it just happens that the windings are wound together, however they need not be. This diagram is drawn the way every electrical engineer would draw it. Think of schematics as the language that electrical engineers use to describe their circuits. Hope this helps
there are easier ways to explain to students how a magneto works...simple.
Yes, you hold this lead and ill turn this. Let me know how it feels. lol
everyone watching this should know what a capacitor is for.
Depends how its being used. A CDI a capacitor is charged then voltage sent to plug for spark. In an inductance coil, a capacitor is used when the primary coil emf is discharged quickly and it keep the points from burning up. So there is to ways in two different scenarios it is being used.
Mr Thompson though sadly eschews the opportunity to educate one and all regarding the use of the capacitor.
You are correct Mr Dean. But overlooked often is the fact that the capacitor allows the fast extinguishing of the arc across the point contacts, as you mention, helping it to not burn and last longer. But this fast shutting down of the current flow makes the magnetic field collapse in a quicker manner, causing a higher amount of energy to be available and hence a hotter spark.
As the contacts open, the energy is enough to start to turn the intervening air into a plasma, which is much more conductive than air, as the contacts continue to open this arc of plasma continues to be drawn out creating the "long" spark. The condenser absorbs this sharp pulse of energy, not allowing the plasma to be drawn out nearly as long, as the energy is sapped by the condenser/capacitor much more quickly and sooner.
This is a reason a dickie condenser can cause a piss poor spark. Or no spark
is this a high tension or a low tension system?
high
Pretty good explanation. Good video
Thank you!
what roll does the capacitor play?
The capacitor has two purposes: to prevent arcing of the points and to help the primary flux field collapse more quickly. As the primary field collapses, Lenz's law is in effect and would try to "push" the current across the points - the capacitor absorbs that energy to prevent arcing. At the same time, that is what helps the flux field collapse rapidly, which is crucial for making a hot spark.
a capacitor is an electrical shock absorber
Thx
Great insight ! Thanks for posting this lesson!
I just want to point something out. I think that for the sake of simplicity, you have OVERLOOKED 2 laws and the role this CAPACITOR plays in this schematics.
Firstly, at 4:21, as the rotor spins in a clockwise direction, the N pole has approached the core, therefore the flux increased to a max. According to the Right-Hand Corkscrew Rule, Lenz's Law, and considering the winding direction of the Primary coil, the current direction through it should have had a ClockWise direction, but in the video its represented in reverse.
Moreover at 6:09, though the primary induced flux and rotor flux superimpose (vectorially add), according to Lenz's Law, as the N pole was approaching the yoke, the induced flux in the coil should oppose the core flux change through the primary, not the other way around as depicted in the figure.
Secondly, at 7:29 the rotor magnetic flux lines are wrongly represented, because they ALWAYS point from the N to the S pole and never from S to N (as long as you are outside a magnet or a coil). They should have had a CounterClockWise direction through the core. Fortunately here, the direction of current through the primary is the right one.
Thirdly, in order to obtain a very HIGH VOLTAGE in the secondary, we need a GREAT FLUX CHANGE through the core (implicitly secondary coil), because the greater the flux change the greater the voltage obtained. Therefore, besides collapsing the flux in the primary, we ALSO REVERSE the current direction through it, obtaining a GREATER FLUX DECAY through the primary, and this is exactly what the capacitor does. A capacitor always opposes a build up in voltage by charging itself. The contactor circuit here shortens both the primary coil and the capacitor. Let's assume the rotor starts from Full Register, with N in the left, rotating clockwise. The capacitor opposes the build up of the induced voltage in the primary by charging up, and immediately after the circuit opens (10 degrees after Neutral, EGAP), the capacitor is no longer shortened by the contactor, so it discharges solely through the primary coil.
Keep in mind, that any collapsing magnetic field through a coil, give rise to a self induced current through that coil. In our case, the self induced current due to the collapsing magnetic field is opposed by the capacitor current through the primary, thus hurrying up the collapse (according to the Right-Hand Corkscrew Rule) !
In other words, the capacitor only forces a reversed current through the primary, to oppose the selfinduced one, in the end accelerating the collapse of the induced magnetic field. This happens very quickly, right after 10 degrees past Neutral (EGAP).
At this point, the CHANGE of the rotor magnetic field in the core is just below peak value, which means the EMFs generated in both the primary and secondary coils are just below maximum. Also, the CHANGES in the rotor magnetic field and the collapsing primary field have the same directions (very important)! As the two magnetic fields have the same direction of change, they will superimpose, thus give rise to a LARGE FLUX CHANGE through the core, implicitly through the secondary coil. This is like a spike in the magnetic flux change through it, leading to a very high EMF at the ends of the secondary, which translates in a spark obtained at the sparkplug.
Moreover the capacitor and primary coil form a tuned LC circuit.
All this starts when the EGAP commences and up to the point when N reaches the yoke (Full Register position), the superimposed flux change being large enough to create the spark.
th-cam.com/video/OMLSNwQiiKg/w-d-xo.html
th-cam.com/video/EcIECFajuJU/w-d-xo.html
th-cam.com/video/lWyn_eV-DzM/w-d-xo.html&t
I dont think the capacitor can charge when the points are closed (cap is effectively shorted). The cap and primary coil form an LC tuned Tank circuit that electrically oscillates for a while when the points open, producing a 'ringing' current in the primary to create the hottest spark possible after step up.
@@HomebuiltHELP it is true, though the short circuit has a very small resistance, even so, the capacitor charges very very little, but immediately as the EGAP commences, the collapsing magnetic field through the primary charges the capacitor for a very small amount of time, after which, the capacitor starts discharging through the primary, creating that reversed current, thus accelerating the field collapse (and even reversing it a little).
You are also right, the purpose of the capacitor being to create a tuned LC circuit, but what does the ringing current mean?? Can you explain the entire process in more detail, right from the start, please? I would really appreciate your opinion.
For a good insight, I recommend watching this video too, though the system differs a little:
th-cam.com/video/OMLSNwQiiKg/w-d-xo.html
th-cam.com/video/EcIECFajuJU/w-d-xo.html
th-cam.com/video/lWyn_eV-DzM/w-d-xo.html&t
@@BaldurKhr If you look at the primary voltage waveform at the time of collapse (using oscilloscope) you will see the recognizable 'ringing' due to the capacitor. This result is telegraphed to the secondary as a much hotter spark. I saw an ignition demonstration of the spark using a capacitor and then leaving it out. Quite a difference! Glad to see that video you recommended explaining that the capacitor had a 'secondary' benefit of reducing the spark at the points.
@@HomebuiltHELP Great pointing the ringing effect out. I will search for it in more detail 'cause it's very interesting.
All I wanted was to try giving an easy to comprehend explanation of the presence of the capacitor in the circuit, so that anybody may form an idea of how it works. Thanks so much for adding to our collective knowledge!
It's a great joy for me to talk to passionate people! I definitely improve my understanding, thanks to people like you!
Flux doesn't create current. It's the change wrt time of the flux that creates the current.
So flux at T not equals to 0 creates current.
It's like saying Bill Gates doesn't make money, it's the work wrt time of Bill Gates makes money
Lines of magnetic flux only create current in relation to a moving conductor, OR conversely fixed conductor and moving lines of flux/field lines. The lines of flux only move when the field is building and collapsing. As there is no physical relational movement between the two. Indeed as happens in an ignition coil and also in any transformer, and the reason one can only have an AC transformer traditionally. The voltage has to vary, or the magnetic field remains static and no current will therefore be induced and flow.
If one moves the things physically, IE, coils and magnetic field moving in relation to one another, in order to move the electrons and hence achieve current flow, one then has created either a generator or motor.
I understand that the condenser's purpose is to absorb primary current to prevent a spark arcing the points as they open so they don't burning out the points. However I don't quite understand how a defective condenser that does not hold the it's rated charge causes a weak spark or no spark at all in the secondary. Is there a condition where the condenser fails and the points don't burn out? Electrically how many different ways can a condenser fail besides not holding a charge?
GMM PA I have seen older auto engines run without a condenser but heavy arcing at the points occur. But in a fault condition...ie..if the condenser is internally defective (internally grounded) then a constant ground will be in effect due to it being bolted or attached to the metal ,this will short the primary current to ground through the case or body of the capacitor.(path of least resistance) bypassing the breaker points,.with no primary current=no secondary current. A functioning condenser (capacitor) will charge up(when points open) then resist or block further DC current flow, when points close it will discharge to repeat the cycle again.
Thanks, that makes sense.
Thank you for the video. The capacitor is used to store the charge, not dissipate it. When the points close, it charges the capacitor, when the points open, the charge that was stored in the capacitor is discharged through the coil, and released to the distributor. There is something wrong with the schematic.
Thomas Gronek Wrong..
Ive done a video that covers this in more detail including how magneto timing advance works and live scope voltage patterns th-cam.com/video/Iw85e1a8jO4/w-d-xo.html
What is the sense of asking if there are any questions if she does not want to answer any questions yet? She should just go through the theory of operation entirely and THEN ask if there are any questions.
She is asking at those students who are present physical, not people who are commenting like me.
naiyar asked for parts for a magneto.......any lawnmower or weed trimer have all the parts that you need
I want a list of parts which is required to make a complete magneto circuit...... Pls pls pls massage me...pls urgent ...help me pls pls help...
Permanent multipole rotating magneto. A soft iron core. Pole shoes. Condenser. Breaker points.
Who is telling you
in the video you mention that p- lead is not a wire , i think it is a wire .... the P-LEAD is the shielded wire that connects the magneto to the mag S/w in the cockpit , if this lead breaks , the ignatian may always be HOT with the engine
She knows this, what she is saying is that the particular line in the diagram is not a wire but a pointer showing what the label “p-lead” is referring to. The p-lead wire is under the one she is talking about. It’s kind of foolish to assume she doesn’t know what she’s talking about, when’s she’s probably teaching A&P applicants.
there was potential in this video but i came away learning nothing.
so theres no battery,?
yes a magneto is its on generator
Magnetos dont require batteries, only something to drive it. Usually the engine
why not have a dc magneto we dont need ac at all engine run on dc all engine do.
Fanshawe students hit like button
The students in this class are annoying, continuing interrupting the lecturer with bullshit questions or echo's
wat
The woman teaching has a lovely voice, wonder how she looks like
lack of explanation ....
I sensed the lecturer has white privilege, I needed to go to a safe space after watching this.
Your safety spaces offends me as I'm trans-toaster. White bread offends me.
Jesus Christ
Jesus Christ White people invented all things mechanical and electrical and chemical ..
All need to be careful, this is not a standard Magneto, they do not need battery to operated and there is no primary and secondary. Actually, this should not be called an aircraft magneto. Also this person has no clue. Having points and a rotating magnet in this drawing is not doable.
Aircraft magnetos have primary and secondary circuits.