A small arduino circuit that would monitor the rectifier output voltage (~40v) and use a servo to actuate the throttle to automatically compensate for load.

Just goes to show you the incredible time and effort taken to design generators, and then they have to make them look like a package, and then generally reliable for the average not intelligent person to neglect. Cheers man this is an incredible feat.

Motorcycle voltage regulators usually work by shorting phases together when there is no 12V load so this is why your engine was loaded. If you want to go that way you may try using a so called series regulator that acts as a line switch instead but they are very expensive. Also it's better if you avoid running the regulator without a battery connected

Put a small 12V battery between the DC-DC converter and inverter. It acts as a capacitor and will both smooth the load on the motor and the voltage out to the inverter

you can get fiberglass based muffler packing material that should be a lot safer to use than steel wool. if the timing ever gets off and you backfire and shoot flames into that muffler, you could have a pretty high temp fire on your hands

Johnny takes big boy toys to a new level 😂

Wow that muffler sounds really nice! I mean, it's literally bigger than the engine so it has a big advantage but it totally transformed it

That knocking at the end got me laughing lol. I know its not a the engine breaking but it just reminds me when Jeremy blew up his Maserati V6 on the cheap supercars challenge.

The motorcycle voltage regulator used in your setup is a shunt type which basically shorted the output coil when there is no load. You need a series type voltage regular, for example, SH775A from Shindengen. You also need to connect a battery or a large electrolytic capacitor at the output to work properly.

I recommend adding a capacitor bank (something like 4700 micro farads and 50 volts at least) after the 3 phase rectifier because the output of a rectifier bridge isn't pure DC. It has a ripple, and that may be what is messing with the rest of the circuit. Also, you could get a cheaper DC-DC buck converter that can handle that kind of load (in case you blow it up).

Great job as always. 👏 I have an idea: Why not using a small car alternator? It usually comes with a built it voltage regulator, that handles high currents pretty well. I did the same thing with a two stroke chainsaw engine lol. You can also use my arduino based throttle / load controller. It is based on a P.I.D. controller so you can easily set it up for your needs 😉 let me know if you need anything and keep it up!

Really fancy would be using the generator BLDC motor as a starter as well.

The motorcycle "rectifier" is also a regulator utilizing the "shunt-regulator" principle. It shortens the generator coils outputs with thyristors when the voltage exceeds 14V at DC. This is a huge waste of energy, but within a MC engine, the stator coils are oil-cooled and so this cheap works and is used mostly.

Most motorcyle regulators work by just shorting the input (3 phase). So they are always drawing full load. Its inefficient, but simple and reliable.

Good work; you clearly put a LOT of work into this. It's about time someone took one of these model engines and actually put it to a practical use.

Sad too see it didn't work out. It was the coolest gen set I've seen, rotary (10A), which was half compressor half engine sounded weird but work good. As always love your work

V12 genset, not what I was expecting from a model engine channel!

That's really cool! hope you get it fixed and running

Cant wait for a V10, it must sound amazing

4:43 wow the brushless motor is louder than the exhaust coming out the muffler awesome!

hearing it on my headphones the exhaust sounds great and in my opinion it actually sounds like a generator

I really enjoyed your video, and it shows just how much work goes into making the generators that can be purchased ready to go. That said, I don't think you were too far off. Regulators as far as I'm aware always need smoothing prior to being fed into anything... I feel that was your problem, as the output converter probably hit a LV state, shut off (VERY briefly) the voltage skyrocketed, and in doing so would have damaged it's own circuitry, and if the output was somehow shorted to the input (MOSFETs probably), would have then blown your 12v inverter.

Finally a nice sounding model engine :)

YAY!! Epic! Love these videos Jonny!!

This is a stunning build brother!!👍👌

That is one very expensive yet very cool generator. I would be the king of the camping community if I rolled up with that beauty

You all should definitely look into building a replica Merlin. Theirs a major fan base for that engine from ww2. Great video as always!

Small car alternator from the wreckers. Should be pretty cheap. Then convert to direct drive with that bellows. You may also need an alternator regulator (modern alternators are often controlled by the ECU - so that function needs to be replaced). Then you'll have constant 14.4V output from an alternator that is fit for purpose (Air cooled) and is likely capable of delivering 1kW of constant electrical power (whether or not the engine can supply that much power is another question).

Johnny q followin that torque curve😂👍 This is great!! Nail down rpm, at all loads.😊

Finally a new video. And it looks really cool

Apart from the capacitor you blew up, that thing is hella quite, like more quiet than what we have in stores

Someone send this man the new CISON OHV v8. Looks better than any others I have seen besides the conleys

Nice bit of engineering mate engine sounds awesome

I would love to see some decibel ratings on that engine at full throttle. Great job.

make another rotary, but this time a 5 rotor, and put it on the same generator rig! Epic work by the way, keep it up we love watching it!

You could use VESC with your bldc motor as a smart rectifier. With it's LISP scripting it would be quite easy to add servo output for active load control.

You need a big capacitor efter the rectifier to stabilize the voltage, as it will fluctuate a lot with varying load, which the buck converter probably will struggle a lot with handling without a big capacitor. Also there are inverters supporting a wider range of inputs, that'll be better suited for your need.

ive always wanted one of those little engines.

Just amazing....every time! Thanks

Try adding a capacitor at the rectifiers output, to stabylise the dc voltage. Should be a pretty beefy one

This video is a fulfillment of my childhood engineering dreams. Literally, but my fun with electricity ended when I plugged a small engine from an RC car straight into a 230V socket, and then I blew up both the engine and the traffic jams halfway down the street hahah

YES! I was hoping for this ❤

I swear I said in a previous v4 or v8 video that making one of them a generator would be pretty damn awesome, a V12 genny would be pretty damn glorious to take to the RC park for field charging! Johnny - did you uncouple the electric motor and see how the engine ran with it uncoupled? The way the inverter crapped out, it may have borq'd the electric motor OR the electric motor borq'd everything? As for smooth power delivery maybe use a couple 12v UPS batteries in series(they are kinda small, 154mm x 94mm x 65mm) after a capacitor to help smooth out the numbers and handle surges? BTW I still want your PocketNC man! 🤣

An ordinary 12 volt generator from a car is ideal here. In addition, it is convenient to adjust the load with it. As a load for measuring power, you can take halogen lamps of 12 volts 65 watts (or more powerful).

I’ve never been so early, love your videos!!

Thanks. Great video, as always.

Alex, from the UKposts channel "2 stroke stuffing" took the small four cylinder engine that all the UKpostsrs had been receiving, and put it on small bike..... until the crankshaft broke. He has been very busy with his own engine lately, but still, I would love to see something like that with the 50cc v12. I am absolutely sure you could make that happen, I don't know if others would have the ability to adapt the crankshaft the same way you would.

Gert great Caps will solve all your problems! Great work....cheers.

You’ll need throttle control for the stable voltage, and a capacitor inline before your dc-dc converter. That should normalize the output voltage and add the arduino to control the throttle at a set voltage or current.

You engines are getting bigger and bigger xd

Really cool! Its better to use active rectifiers indeed. And why not simply use any cheap DC-DC buck converter with wide input voltage range for 12V stabilisation? You'll be able to rev the engine and get all the power.

Wow, thank you!

The engine should be installed in a go cart; it's fantastic. Using it to power a generator is wasting its greatness.

I would go for a car alternator and a pb battery as a buffer and to help regulate the voltage output.

The motorcycle regulator is doing what it should! You have a generator capable of putting out hundreds of watts of power, and in an unregulated state the voltage was around 40. The way that regulator works is that if the voltage is too high, it grounds it out through a resistor. So you push 40 volts in and the regulator just wastes away power as heat to force it down to 12-13 volts, pulling the full 150 watts that generator was able to produce in the process. If you connected up a load which could draw 150 watts, the regulator would do nothing, since the voltage would already sink down low enough.

probably exactly what the designer of this v12 thought his motor would end in;)))

Been waiting for another video from you 👍🏻👍🏻👍🏻👍🏻👍🏻

You can try an AC generator and use a PID controller to keep the engine speed stable through a servo connected to the throttle.

Alternator to diode rectifier to Solar charge controller to battery. Inverter from battery. Also might want to consider a governor to increase the torque when the load increases.

You should use a capcitor after the recifier to smooth the voltage and also you should use a fuse directly after the recitfier. Also everytime your engine will increase its throttle a little bit you will get little voltage spikes that will go over 40V without any problem.

You should add a bunch of 100+V rated caps on the rectifier output. Then have a small ish 12v battery on the buck converter output. This should make everything work much better

Those old school motorcycle regulators are designed to essentially dissipate excess energy as heat as opposed to reducing the output of the generator so it's essentially running at 100% all the time. More modern MOSFET style regulators are more efficient but neither one of them are really designed to be run without a battery as a buffer so I don't know if either will really work for this application.

What I would use is a small car or boat alternator, some versions have very efficient voltage regulation and could be easily used with a dc to dc inverter, you could also use a small 12v battery as ballast to help control the instant load on the inverter. My guess is that’s probably what killed your inverter capacitor. Also, consider some sort of governor to keep the engine at a fixed rpm

Connect small car alternator or motorcycle such from Yamaha FJ or FZR series, BMW R or GS series, older Triumph Tiger 1200. In this case, 12V lead acid battery is mandatory. But is highly efficient!

Nice build and all but what use would it be to the buyer ? Compared to a full sign gasoline generator🤔

Have caught 1 of JQ90's videos in a bit, man it's insane that he has nearly 2M subs now, I remember watch his vids year ago when he only had 100K+.

Your asking us your the genius lol I'm impressed with every video you'll fix it

Very creative of you, Jhonny. Very cool! If you can, try using an electronic governor to control the acceleration as the load increases on the generator. As for the inverter, I don't know if there is one for sale that works with an input of up to 60v. If one of those exists, it would be ideal for this application. I think that to choose a brushless motor as a generator, one must evaluate its maximum rotation while receiving the maximum tolerable voltage when it works as a motor, properly speaking. If, as a brushless motor, it has a very low rotation and is receiving a high voltage in the phases; So, as a generator, less rotation will be needed so that it, functioning as a generator, provides its maximum performance. This is because there are engines with lower speed ranges and others with lower speed ranges, but if the engine does not need to reach the red line to deliver the generator's maximum power, it means that in this type of application it is even better.

Fantastic performance

With the muffler exhaust ports facing upwards, are you worried about condensation forming and pooling inside the muffler? Great build btw!

The motorcycle rectifier has a scr which shorts the input to regulate 12v

The most important thing to do at this point is to use a motor controller as your rectifier and have a small battery to regulate your output voltage. One of those little Sealed Lead Acid (SLA) batteries for backup power supplies would be fine. Additionally, once you add a motor controller the motor's qualities need to be chosen to output no more than the desired voltage at the max RPM you'll run the generator if you use a BLDC motor. Finding something that outputs 12V in the size motor you have at 10krpm might be difficult, so finding equipment that runs on 48VDC nominal might be a better option. Alternatively, you can rewind the motor with fewer turns than stock to make a 12V motor for yourself. As long as the phase output voltage at the load RPM never goes above your target battery voltage, a motor controller can boost the output voltage to battery voltage under regenerative braking. A VESC6 or one of its larger variants would likely make a very good option for such duty.

You can also try a MPPT solar panel controller. It has a wide input voltage range and you can use it to charge a battery. You'll probably need more capacitance after your rectifier as well. Good luck!

The problem its when the engine gains load it tends to lower the rpm. You need something that accelerates the engine as the load is put on it so that the rpm is constant. In professional groups a pick-up is used that measures the rpm of the crankshaft and a solenoid that actuates the accelerator so that the rpm remains constant.

awesome job! do you modify the brushless motor? i try same differents methods as you. and with a wind turbine 3 phases charge controller and no good results. i try with a big condensator, and at the end i charge directly a 12v lead battery. and get the power from it.

This channel is the best.

@JohnnyQ90 the bldc motor/alternator is shortcircuited because it was overheated, meanwhile it probably produced voltage spikes (voltage exceeded 60v) that breaked the dc-dc convertor and the invertor. Your design is almost perfect except the bldc motor needs to be cooled. So i think you can use a "water cooled bldc motor" as alternator with exactly the same system and it should be fine. Or using a car alternator instead water cooled bldc motor + bridge rectifier + dc/dc convertor would be much easier. Additionally later maybe you can add an arduino for automatic throttle controlling for constant rpm

Motorcycle voltage regulators are shunt regulators, because the alternator is working like a current source and not like a voltage source. Inside the regulator are thyristors, shorting the phases until end of halfwave.

You should try putting a lithium motorcycle battery into it to smooth the voltage. Some sort of battery that is intended for direct automotive use of constant charging/discharging. I imagine the inverter and the DC to DC converter would be much happier with it though to have it before the DC to DC you would have to ensure you can control the output voltage to keep the battery happy though. On the other hand, a bank of capacitors is probably the most common solution to the problem of voltage smoothing, and depending on the capacitors chosen they wouldn't care quite as much about some voltage change. But they likely wouldn't have quite the added storage capacity built in that a lithium battery would.

you need a big capacitor on the output of the rectifier, its why its unstable

If you go for a higher KV brushless motor (or re-wind the one you have), maybe around 350KV, you should be able to lower the output voltage quite a bit so that it's around 12v, so you won't need a dc-dc converter. Or try using an inverter with a higher input voltage - you can get 24, 36 and 48v inverters, in addition to the 12v ones. That and a big capacitor to smooth out the ripple, and a governor to adjust the throttle to maintain a steady output voltage, and it should work a lot better!

that DC to DC converter has written as the 24input and 12v out put. you did input 40v+ from BL motor to that. may be that s why it blew up.

Nice work ! Awesome.

Super travail 😮utilisez une DIODE ZENER, a brancher entre le + et - , qui bloquera la tension a12volts, j'avais une moto débridée qui l'avait cramé un boîtier CDI, j ai donc installé cette diode pour protéger le boîtier et ça a fonctionné parfaitement

Try hooking a hydraulic pump to it and split some wood? That wood be cool! LOL

Use an alternator, a lead acid battery and a 12V inverter. The alternator contains circuitry that stabilizes the output voltage regardless of its rotation speed, the lead acid battery acts as a buffer, and the inverter can rely on a stable voltage.

Congratulations. It would be great if you add add-ons such as engine temperature, tachometer, oil pressure, exhaust temperature.

So the motorcycle rectifier is putting a heavy load on it because it's shorting it to ground. You don't have a 12 volt load on the system so it immediately gets up its 12 volt limit, And then it basically shorts to ground putting all the energy as heat. That's why you see the big load. What you want is a switching regulator that just disconnects when it goes high. For this to work really well what you want to do is use something similar to what solar panels use and take the variable voltage generated by the motor and feed it through a solar style switched regulator to the battery. Then you connect your power inverter and everything else to that battery. All of that stuff stay safe and never sees those voltage spikes. The battery kind of absorbs it along with the regulator. And it gives you a buffer so you can rev up the engine if the load is getting high to keep the battery charging or if there is a sudden current draw the battery can compensate until you change the speed of the motor again.

Most generators run at a set speed about 3000 rpm and contain an AVR to stabilize the load to engine rpm so that it remains constant and hence output stays the same. And as one guy says n Arduino could do that if you the skills to program it. You can buy AVRs but they are set for ac 120v or 230v.

The output (dc side) of the full bridge rectifier needs some beefy capacitors to equalize the voltage spikes and drops. All quality power supplies with fbr have big capacitors!

Use regular alternator. Kubota alternators are really small. However, the alternator requires a battery to stabilize the voltage and for excitation.

JohnnyQ90 better start a mini generator company LMAO

Maybe a Buck Converter ? Can go from your output voltage to your desired voltage .. Just a thought !

if you can get your hands on a small PV inverter you can skip the DC-DC converter. Maybe even one of those big battery bank with a PV input

Now I'm curious to see how the inline 6 would fair with something similar to this setup.

Needs an RPM governor and a non permanent magnet generator that the excitation current of the rotor can be adjusted like a small car alternator.

fascinating great intuitiveness🤙🔥💨

Hi, I'm a mechatronic engineer. I just speak based on my perception, first the BLDC motor is not design as a generator. Second, there are too many step of power conversion such as rectifier for converting 3 phase ac to dc passing through 12v regulator and step up to 120ac. Maybe you can try a generator direct charging 24v battery, then connected to inverter to produce 120v ac. Like this the battery acting as a buffer for the sudden draw of the current spike. Like this it is more practical ussage for daily life.

The EMD GP20C locomotive and that project in this video has something in common. They both have V12 engines and they both have a generator. I learned a while ago that the amperage decreases while the motor speed increases. Must be efficiency or something.

Motorcycles so not have large power requirements so they use simple shunt regulators which short out the output of the alternator to limit the voltage. The alternator output operates as a current source (high impedance) so this mode of operation is not destructive. Your DC brushless motor operates as a voltage source (low impedance), so shorting the output draws huge amounts of current putting a huge load on the engine. Vehicles that use alternators or generators adjust the much smaller field current to regulate the output. Since your DC brushless motor provides an output voltage proportional to RPM, a switching regulator like you were using is the best choice, but maybe get one which supports a larger input voltage range. The 3 phase rectifier produces an output which does not drop to zero like a single phase rectifier would, but a bank of capacitors is probably a good idea anyway. I would go with about 5000 microfarads per amp, but a large capacitor bank will make starting harder until the capacitors are charged.