well it's not exactly brushless since excitation in rotor is fed through brushes anyway. Hiding that fact PMSM or even async squirrel cage fed by inverter can be considered BLDC while not exactly being one (there ARE differences which you can google yourself).
OK I guess you don't call that background noise "music" but some people would. And I stopped the video after ads kept interrupting it. 6 minute video shouldn't have 3 ads in the middle of it, very distracting. And yes, you'll put your eye out kid, attaching a roach clip to an alternator pulley wheel.
When you change the field winding voltage, you change the field strength, and therefore the KV of the motor (KV is RPMs per volt at the armature). A low field winding voltage results in a high KV, which means the motor will turn very fast when the armature is operated at 12 volts, but there will be less torque available at the drive shaft. If you use a higher voltage on your field windings, you reduce the KV of the motor, so it will turn at a lower RPM but with greater torque. You can think of the field winding voltage as acting a lot like an adjustable gear ratio for the motor. If you were to use this on a go kart or something, then gradually reducing the voltage to the field as you accelerate would allow you to gain higher top speeds, without sacrificing the amount of torque available for accelerating from a stop or at low speed
@@londonnight937 there is a window in which it will be most efficient. Very high or very low field strength will lead to poor efficiency, but an alternator does not make an efficient motor in the first place (approx 50-60% compared to 80+% for a well designed brushless DC motor)
@@londonnight937 wish I could mate, but it's been some years since I went down that rabbit hole. It pretty much comes down to the alternator not really being optimised for motor use, in the same way a BLDC motor isn't optimised for use as an alternator. Those numbers are only ballpark figures. There's a few forums out there about using these as motors for gokarts and the like that go into a lot more detail and that's what I'm recalling but I don't have the links to them
ola amigo eu sou do Brasil, e gosto muito dos seus videos. Sempre com ideias inovadoras e muito interessante...Parabéns continuo sendo um dos seus inscritos..eu como técnico em eletrônica sempre renovo o meu conhecimento e você faz parte disto...obrigado.
Very interesting. I would like to see what kind of working loads it will drive. IE. A circular saw blade, a grinding wheel or even an electric vehicle of some description.
@@argue117 I'm exploring options for my frankienstein ebike I have its currently a 36v rear hub 350watt and a 36v 29.25amp battery I want to make some sort or boost on a belt drive to the rear so u are using most cruising power off hub ND boost with the belt drive system I'm thinking like a 23amp brushless controller At 36volt for the belt and the 350watt is a 14amp max controller I would keep on
@@argue117 bonjour suis très intéressée à vos expériences NB: comment avoir ce régulateur (contrôleur)et à combien merci Hodefroid Kayembe de Lubumbashi en RDC
In this video you are showing to run an alternator as a motor but this is not a brushless DC Motor. Instead brushes are there in an alternator. But I am sure You have made big changes in the alternator to run it like a motor. An ordinary alternator without changes can't run like this.
Big changes? The only change is that an alternator has an electromagnet in its rotor, it indirectly controls the voltage like this. If voltage is high, current decreases - induced voltage goes down, opposite if the voltage is low. By powering this rotor coil, it effectively becomes an BLDC motor. You can replace the electromagnet with a permanent magnet, but that is expensive.
*This is not brushless,* the rotor uses slip-rings that are still brushed, like all alternators. You are only running two phases of the stator windings with a two-phase controller, on an alternator that is obviously wound Wye with a center ground. This is incredibly inefficient and delivers far less power than using a three-phase controller with the hub-tap open, on a Delta-wound alternator. Alternators are 3-phase, not bi-polar. You also do not need the capacitor, a pair of neodymium magnets on the rotor, or otherwise magnetizing the rotor, will cause it to self-excite once the stator winding is energized and the "field" (rotor) begins to react with it magnetically. Remove the brushes and short the slip rings, give the stator 3-phase power, and you will have a 3-phase constant-torque repulsion-run motor that will behave similarly to a permanent-magnet DC power motor except that torque will remain the same at any speed, but speed will increase with more power applied. Alternators are generally insulated with class H insulation, meaning that they can run up to 180°C (356°F) [This includes ambient temperature, this is an absolute rating], so it's okay to get them a little hot. Just keep in mind that the amperage rating of the alternator is an absolute maximum, and if you are not using 3-phase sine, you will fry it before you hit 100 of those 120 amperes. If you want to convert alternators into motors, you MUST use the largest stator core possible. Look for Japanese luxury cars in the boneyard and find a LONG core, none of the A/C Delco or other American made crap. The Japanese make some of the best alternators for this kind of fun. You might want to pick up a Denso starter motor or three while you are at it, found in many if not most Japanese cars, they are the size of a beer can but deliver up to 7HP for up to 30 seconds (5 min cooldown), but can also be rewired easily for many different combinations. Brushless means that commutation of the rotating field is done externally, as opposed to using a commutator internally with the motor. *Alternators are NOT brushless.*
@@amitrajsingh38 Thank you. I experimented with this myself, and I am very knowledgeable on all types of motors (and I am an engineer), so I want to make sure people can have the correct knowledge to do it themselves, because these are fun projects to do, and inspire creativity.
I've enjoyed your series on converting an alternator to a motor. I do have a question, How long will this capacitor power the rotor in this motor in a continuous duty cycle? One hour? One day? One week? month? year? indefinitely? If anyone knows the answer to this question please send me a reply to this comment. Thanks again...
Neat, simple idea. I like it. It would make a great science experiment for my kids science class. My question; what is its power? Can it do any useful work or is it simply a demonstration exercise?
Depends on the type of load you want to put on the alternator... Power is good and its not just a demo exercise.. Although, a larger power controller should be used to run this alternator as a motor if you are planning on making an ebike or a go cart with it.
Nice experiment, but motor velocity without loading is meaningless. It would be helpful to post practical load, torque & efficincy data for this rig. Most of your test gear is already in place. Without useful data, the video gives low SNR, unfortunately.
Car alternator's rotor iron stays magnetized due to remanent magnetism, so, of course that you'll have some output from this effect. The other thing is that you charge capacitor, and it produces current in field winding until it's discharged. To really know how it behaves dynamically (time responses of voltage and current), you'd need to know a lot of circuit parameters. So, don't try to sell some mumbo-jumbo, or cumba yaa, and expect to praise your work.
This is really really cool, I have some questions that I would love to contact you about. I'm engineering an electric turbo/supercharger and I want to use supercapacitors and possibly a small alternator, I dont know much about electrical engineering though.
*Big scientists are also working on this type project of capacitor. They trying to use capacitors in place of battery 🔋... Seems in nearest future big inventions going to happen.*
One basic thing: ohm's law. for DC the field (rotor) is a resistor, less voltage = LESS field current! and this is correct, LESS field current = higher speed! Alternator runs at a speed where the voltage it generates = supply voltage (apart from losses). more field mean higher voltage generated so speed drops. If the battery voltage and the generated voltage are the same, what is the current value in a resistor in series with the battery? (i.e. the resistor in the current meter)? This means the voltage on both sides of the meter is the same, so NO current is flowing! But, of course, there are losses so it slows down enough to make the loss current flow.
congratulations for your job. two questions : how long does the capacitor charge last? to power the rotor can you use the battery that powers the stator?
that's why some early cars hade engine run one problem's those old alternator hade capacitor's on them,its directly related to magneto ignition,waste spark,dual ignition amd electric car's
You still need a battery to run all of your accessories in your vehicle. No capacitor is going to do that by itself. Something has to first charge that capacitor in order for it to release it's energy. In other words the capacitor has to see a load.
try to connect two cords from capacitor circuit in series to battery and controller, without paralel capasitor, alternater-"magnetcoil" can burn your controller
@@hamadaragabhamada correct but apparently it last a little while ,perhaps having a small rechargeable battery being part of this circuit would be more practical
I’m not sure about the role of the super capacitor. It is storing charge, which is what capacitors do, but what is the stored charge doing as it discharges into the motor? One would think any stored charge is dissipated into the amateur windings and once its discharged there’s no more charge left.
You could turn your car into a gas electric hybrid. Maybe with an alternator/motor, you can supplement 800 to 1200 watts of electrical power converted to mechanical horse power.
Nice work but have questions if you give load on alternator how many take Ampers? Please can you help me i want use this idea in project please reply and so thanks
What happen if you put 2 super capacitor in series? Because only one have 2.7 v, if you put two of these together, you make a super capacitor 5.4 v. It's possibile? Is the same like put together 2 batteries?
Hello If i connect for example a 36V battery pack to the controller and to the alternator. Can i use the same capacitor or do i need to use a different one? Regards
You claim it to be "Brushless DC Motor" In fact it is not. If you goto 3:27 in the video. You can clearly see the brushes with the wires hooked to them coming from the center. Those brushes are what you are connecting the capacitor to.
Would a 2000 watt 72-96v controller work better than a 48v1000 or 1500 watt controller, I may use 2 on my bike, of the 1500 watt, with 2 motors, and 64v battery, 16s liion near 4 hp, and the TQ of a 20 hp gas engine, I hope it is enough,
I'm struggling to understand the point here. OK, so you can make an alternator into a motor. The power seems to be around 24W, which is tiny for such a big motor. What sort of power and torque can you get when it's loaded? The whole super-capacitor thing seems to be a red herring - it's just a power source - you could use any other.
Hi I am following your reuse of alternator. I would like to run a racekart with an alternator. What do you think how much kw can you generator with a 50 A Generator in a conversed mode to motor. What voltage is proposed. 24V ???
@@nadirsiddiqui9559 Use a PWM to control the current flowing through the field. A high current will give you a lot of torque but low top speed, and a low current will give less torque but higher top speeds. With a PWM you could use a knob to adjust it to however you want.
I’m sorry, can someone explain to this Electrical Engineer (me) why this is at all noteworthy? Mr. Electron, you are confused, and confusing your viewers - perhaps intentionally, perhaps because you yourself have no clue - into thinking you are somehow powering the “alternator” with the capacitor. The capacitor isn’t running the motor. Notice the ammeter indicating the current being delivered by the 12V battery? Several amps? The capacitor is just “exciting” the “field” windings enough that the motor (barely) turns. How long does the capacitor last in this role? How much torque does the motor have with a rapidly decaying 2.7V field? I mean it’s interesting that he has managed to make the alternator run on 12V DC, though I notice three wires going from the Controller to the alternator, so I suspect it’s been modified (modified beyond simply removing the rectification and regulation.). The You are just confusing people, and encouraging them into thinking they can drive their electric bikes with capacitors... Like, even if this was all true, you could power your bike from that barely spinning (100 RPM) and undoubtedly low torque “motor”. In case you really have no clue, let fill you in. Low RPM, low torque equals low power (even though you’re drawing like 25W from your 12V battery). Last time I did the math, that super cap, fully charged, has about as much energy as ONE AA battery. And it’s hard to use that energy. Unlike the battery, which maintains an almost constant voltage until dead, the voltage of the capacitor quickly decays as it discharges. Sure, 500F capacitors were science fiction not too many years ago. But it will be quite a while before you can power your alternator without the assistance of that 12V battery Capacitors have advantages over batteries (you can charge them pretty much instantly and discharge them even faster) and there are legitimate uses for them, but powering your bike is not one of them. Learn some about electronics before your video and your comments get someone hurt. Your crazy alligator clips and bare wires are going to short out someday. And THEN you’ll see how quickly a capacitor can dump all its energy! Try shorting out your charged capacitor (the 2.7V one you charged with 4.x volts - don’t leave that unattended). Try a penny. If you’re lucky, it will spot weld itself to the capacitor. If you’re less lucky, the capacitor might explode. Oh, and be sure to wear jewelry, like a wedding ring, when you do this experiment. It’s surprising how hot a wedding ring can get (and how badly you can be burned). I’ve seen a wedding ring get so hot when it mistakenly shorted 110V that it literally exploded into a gaseous cloud of molten gold that gold plated the inside of the junction box. Stop fooling people, or yourself, into a dangerous, heavily flawed experiment. Oh, and one more thing. You can get some simple AC alternators to work as motors depending on the design. I’ve done it by just feeding a square wave pulse train into the (two) wires. Not all will set start, some have very limited range of RPM that they will run at. But most will run with a square wave, not even requiring a nice AC sine wave. Older alternators and some inexpensive AC generator have fixed magnets, so you would even need your silly capacitor to excite the field.
These alternators are 3 phase internally. The supercapacitor is just for field excitation. A lower field will allow a higher speed for a given running voltage. The fiels could inded be replaced by a permanent magnet - which uses no power at all. Which is proof the supercap is not what is powering this motor.
Thanks for your video! I'm having questions about Amps versus Volts. Here is High Amps but just 2.7 Volts. Would you get similar results with say 150 Volts and 5 Amps? Than You
Un brochazo por el alternador antes para limpiarlo y hubiera quedado más chip el video. Cuantas revoluciones puede dar el alternador? Y cuantos Amperios se come funcionando al 50 %
I understood when field winding was excited by a 3.3V cell as it will create a constant magnetic field just like a BLDC motor rotor. But how the super capacitor was not creating any problem in working of motor as capacitor with field winding will form a LRC circuit which will work as an oscillator, means magnetic field of the field winding will changes its direction!!! Can u please explain this??
is it possible to charge the battery and also a 12v1Farad capacitor but also from the same capacitor and battery to excite te alternator to run endles time?
