How Alternators Work - Automotive Electricity Generator
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Date: 2023-11-17
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Comments and reviews: 30
KJs581
Great video, well done. Full wave rectifiers typically have a capacitor to filter voltage, and an inductor to filter current. But not cars.
Car alternators don't have any filter capacitor. They CAN have a capacitor to reduce radio interference, that is completely different, and too small capacity to filter ripple. But the battery is what filters the ripple. The battery is charged by the peaks, and holds them between peaks, hence = filter. Because it smooths the voltage because it can't react/change as quick as the ripple does. The capacitor would have to be quite large. Strip any alternator, you won't find a large capacitor, nor will you find anywhere in the cars ccts.
That is why any car manual says Do not jump start car then run car without battery as no filter. I fried my battery once with a dead short, and when jump started (to see if battery would charge) the ammeter wavered, as that was the ripple without the battery working to filter it.
60's British motorcycles acknowledge this in that there is a portion in the manual on how to run without a battery (for off road use. They provide a cct and part number for a large capacitor to suit.
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Great video, well done. Full wave rectifiers typically have a capacitor to filter voltage, and an inductor to filter current. But not cars.
Car alternators don't have any filter capacitor. They CAN have a capacitor to reduce radio interference, that is completely different, and too small capacity to filter ripple. But the battery is what filters the ripple. The battery is charged by the peaks, and holds them between peaks, hence = filter. Because it smooths the voltage because it can't react/change as quick as the ripple does. The capacitor would have to be quite large. Strip any alternator, you won't find a large capacitor, nor will you find anywhere in the cars ccts.
That is why any car manual says Do not jump start car then run car without battery as no filter. I fried my battery once with a dead short, and when jump started (to see if battery would charge) the ammeter wavered, as that was the ripple without the battery working to filter it.
60's British motorcycles acknowledge this in that there is a portion in the manual on how to run without a battery (for off road use. They provide a cct and part number for a large capacitor to suit.
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robert
That was great. very detailed. been working on them over 35 years now. so many different types. most of the US market uses a Delta wound stator. this video shows a Star winding. still works. not very common in US auto market. The diode trio is not always used. but will be a very long video to go over the different types, anyways very good job with this video. this is pretty close to the replacement 1 wire type in my CAT genset. pully has 2 belts. stater is Delta wound. The voltage REG is different. self exciting type. just spin in either direction and charges battery. Thank you for taking the time to make this video.
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That was great. very detailed. been working on them over 35 years now. so many different types. most of the US market uses a Delta wound stator. this video shows a Star winding. still works. not very common in US auto market. The diode trio is not always used. but will be a very long video to go over the different types, anyways very good job with this video. this is pretty close to the replacement 1 wire type in my CAT genset. pully has 2 belts. stater is Delta wound. The voltage REG is different. self exciting type. just spin in either direction and charges battery. Thank you for taking the time to make this video.
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Charlie
Thank you for this great video! I have a question about the frequency of the AC that this generates: With the iron poles being placed with spacing in between them, doesn't this create magnetic flux lines between each interlocking tooth? With this in mind, when the rotor is rotating, doesn't this cause AC to be generated between each interlocking tooth as they pass by each coil in the stator? In other words, doesn't this cause the frequency of the AC in each phase to be proportional to the number of each tooth on the iron pole multiplied by the rotational rate of the rotor?
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Thank you for this great video! I have a question about the frequency of the AC that this generates: With the iron poles being placed with spacing in between them, doesn't this create magnetic flux lines between each interlocking tooth? With this in mind, when the rotor is rotating, doesn't this cause AC to be generated between each interlocking tooth as they pass by each coil in the stator? In other words, doesn't this cause the frequency of the AC in each phase to be proportional to the number of each tooth on the iron pole multiplied by the rotational rate of the rotor?
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Tri
If we get a good powerful starter motor working with bypassing cut off switch and add on control switch we can build hybrid car instantly from regular combustion engine car. may help because if motor drive both engine and alternator while alternator supply power for motor drive transmission
We had the mechanism disengage the Piston crank shaft during electric mode then lighten the load for motor directly drive transmission shaft while Piston disengaged. i thought altinator mean it alternating between motor and generator
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If we get a good powerful starter motor working with bypassing cut off switch and add on control switch we can build hybrid car instantly from regular combustion engine car. may help because if motor drive both engine and alternator while alternator supply power for motor drive transmission
We had the mechanism disengage the Piston crank shaft during electric mode then lighten the load for motor directly drive transmission shaft while Piston disengaged. i thought altinator mean it alternating between motor and generator
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Alejandro
11: 03 - Theres a mistake there. Its true the magnetic field of the magnet perceived by the coil is strongest when the magnet is vertical. But, from Faradays law, the induced EMF (voltage) is proportional to the rate of change of the magnetic field, not to the magnetic field itself. Since the rate of change of the magnetic field is maximum when the magnet is horizontal, then the maximum voltage is produced when the magnet is horizontal, not vertical as shown in the video.
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11: 03 - Theres a mistake there. Its true the magnetic field of the magnet perceived by the coil is strongest when the magnet is vertical. But, from Faradays law, the induced EMF (voltage) is proportional to the rate of change of the magnetic field, not to the magnetic field itself. Since the rate of change of the magnetic field is maximum when the magnet is horizontal, then the maximum voltage is produced when the magnet is horizontal, not vertical as shown in the video.
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Tornado
Can you explain me this paradox?
I don't understand enough, the power can't be raised if it's just passed through the coils!
You get energy from battery to the coil and transfer it (the same power) in the second coil where coming from the additional energy that supply other devices?
I see the alternator just passing power not producing energy (as electromagnetic from one to other coils!
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Can you explain me this paradox?
I don't understand enough, the power can't be raised if it's just passed through the coils!
You get energy from battery to the coil and transfer it (the same power) in the second coil where coming from the additional energy that supply other devices?
I see the alternator just passing power not producing energy (as electromagnetic from one to other coils!
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Teun
while using the transistor to adjust the current and voltage to the stator, would you need a capacitor inbetween the transistor and stator to smooth out the voltage too? seems like outherwise you'll just have a varying voltage and maybe even something similar to ac? or can the stator compensate for that? if using only a transistor you'd just get a very fast variaty in ac output strength right?
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while using the transistor to adjust the current and voltage to the stator, would you need a capacitor inbetween the transistor and stator to smooth out the voltage too? seems like outherwise you'll just have a varying voltage and maybe even something similar to ac? or can the stator compensate for that? if using only a transistor you'd just get a very fast variaty in ac output strength right?
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U8. ajd
My only curiosity is if a car uses direct current for its electric components, why use something that generates alternating current? It seems unnecessarily complex to use an alternator with extra components when a DC generator could just supply the direct current needed.
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My only curiosity is if a car uses direct current for its electric components, why use something that generates alternating current? It seems unnecessarily complex to use an alternator with extra components when a DC generator could just supply the direct current needed.
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Joe
I am very confused on the rectifier bridge. If DC voltage flows out to the battery via the top three diodes what is the purpose of the bottom three diodes? Are they only there to block current when going in reverse or does anything actually flow through the bottom three
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I am very confused on the rectifier bridge. If DC voltage flows out to the battery via the top three diodes what is the purpose of the bottom three diodes? Are they only there to block current when going in reverse or does anything actually flow through the bottom three
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k4_mi1
Very good video, although there is an error, at 11: 44 the animation is wrong because the current should now be flowing in the opposite direction. The current is at maximum when one of the poles is close to the wire like the animation at 11: 24 shows.
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Very good video, although there is an error, at 11: 44 the animation is wrong because the current should now be flowing in the opposite direction. The current is at maximum when one of the poles is close to the wire like the animation at 11: 24 shows.
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jack
At around the 12 min mark, you have the current wrong. As one of the N-S poles is closest to the coil AND moving away, the current will reverse at that point and not reverse direction again until the next pole is at the closest position to the coil.
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At around the 12 min mark, you have the current wrong. As one of the N-S poles is closest to the coil AND moving away, the current will reverse at that point and not reverse direction again until the next pole is at the closest position to the coil.
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Vahagn
This is brilliant. All these years I never understood how can a motor work without a magnet. Now I see, the engine generates enough torque to generate the energy for appliance pluse the energy to create its own magnet(magnetic field)
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This is brilliant. All these years I never understood how can a motor work without a magnet. Now I see, the engine generates enough torque to generate the energy for appliance pluse the energy to create its own magnet(magnetic field)
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Abhishek
What is the need for a diode trio when you have a rectifier circuit. The output from rectifier is also dc. You can take dc output from the rectifier and feed it to the field windings without a diode trio.
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What is the need for a diode trio when you have a rectifier circuit. The output from rectifier is also dc. You can take dc output from the rectifier and feed it to the field windings without a diode trio.
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SkillfulScott
Energy comes from the Tesla battery if anything the alternators would need a backup battery spinning from a belt or moving wheel really doesnt matter but yall do as your told it wont work
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Energy comes from the Tesla battery if anything the alternators would need a backup battery spinning from a belt or moving wheel really doesnt matter but yall do as your told it wont work
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Simon
At 7: 42 I'm confused as to why the slip rings turn different directions. Is that whats making it alternating current? If not, how is it generating alternating current, relyin on the rectifier?
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At 7: 42 I'm confused as to why the slip rings turn different directions. Is that whats making it alternating current? If not, how is it generating alternating current, relyin on the rectifier?
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Ville
So without the iron poles connected to the ends of the rotator's coil, it wouldn't work right? Because there'd be no shift in polarity, and so no AC, with just the coil spinning on it's axle?
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So without the iron poles connected to the ends of the rotator's coil, it wouldn't work right? Because there'd be no shift in polarity, and so no AC, with just the coil spinning on it's axle?
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Trevor
Will need to be jump started --? ? or you could fit a fully charged battery or you could connect the existing battery to a battery charger or you might even be able to 'push start' the car.
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Will need to be jump started --? ? or you could fit a fully charged battery or you could connect the existing battery to a battery charger or you might even be able to 'push start' the car.
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Gospodin
In an ideal world people would quit universities and instead of spending money on tuition costs, they would donate to creators such as this(these) behind such a wonderful video
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In an ideal world people would quit universities and instead of spending money on tuition costs, they would donate to creators such as this(these) behind such a wonderful video
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Simply
Can we use car alternator to generate electricity for home use. I shall use dc motor to rotate alternator, after initial battery power.
Can this setup output 14v dc
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Can we use car alternator to generate electricity for home use. I shall use dc motor to rotate alternator, after initial battery power.
Can this setup output 14v dc
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Gottlieb
Am familiar with what's in this but one thing I've always wondered is why they chose 3 phase in society and not four90, five72 degrees or more.
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Am familiar with what's in this but one thing I've always wondered is why they chose 3 phase in society and not four90, five72 degrees or more.
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Jt
I'm surprised that alternators don't use a brushless design, that seems like it should be quite intuitive. can someone explain if and why I'm wrong?
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I'm surprised that alternators don't use a brushless design, that seems like it should be quite intuitive. can someone explain if and why I'm wrong?
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The
Genius idea: put alternators on electric vehicles, and charge them while they run. BOOM infinite energy. Ill take my Nobel Prize now, thank you
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Genius idea: put alternators on electric vehicles, and charge them while they run. BOOM infinite energy. Ill take my Nobel Prize now, thank you
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Gregory
He said the diode smooths out the DC supply, does that mean current always leaves a diode as a DC signal even if an AC signal goes in?
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He said the diode smooths out the DC supply, does that mean current always leaves a diode as a DC signal even if an AC signal goes in?
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Pepperoni290
In theory, does producing electricity require to steal from the effectiveness of the engine or is it produced for free?
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In theory, does producing electricity require to steal from the effectiveness of the engine or is it produced for free?
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Crystol
Watching videos on electrons, atoms and car stuff has me like thats crazy. I actually understand whats being taught.
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Watching videos on electrons, atoms and car stuff has me like thats crazy. I actually understand whats being taught.
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Crystol
Watching videos on electrons, atoms and car stuff has me like thats crazy. I actually understand whats being taught.
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Watching videos on electrons, atoms and car stuff has me like thats crazy. I actually understand whats being taught.
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Dwaine
Thank you for this video it was very enlightening and thank you for the details the graphics and the explanation
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Thank you for this video it was very enlightening and thank you for the details the graphics and the explanation
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llnam12
Electricity is the flow of charge in a wire. The electrons stay with the protons, it doesn't flow any where.
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Electricity is the flow of charge in a wire. The electrons stay with the protons, it doesn't flow any where.
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Lemuel
I studied 4 years in college but I didn't understand how AC current and. magmetic field works until now.
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I studied 4 years in college but I didn't understand how AC current and. magmetic field works until now.
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Louisiana
I think my phone was listening to my class to suggest me this. Literally what we are doing in class.
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I think my phone was listening to my class to suggest me this. Literally what we are doing in class.
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