Anybody got a good source for BLDC Motor gearboxes?

There are two more ways to check which one is the best generator: - By shorting motor wires and manually spinning the shaft, the more resistance you have turning it, the more power it generates. - The electroboom way: just put motor wires in your mouth and spin the shaft, the more painful motor is the best generator : )

I hear 'Full bridge rectifier' as 'FOOL BRIDGE RECTIFIER' lol that too in caps :P thanks electro boom :D

As a mechanical engineer, I love your videos. Just simple enough to make sense to my little brain, but complicated enough to give me new ideas.

Just completed the break-in period and so far the unit is operating perfectly ukposts.infoUgkxOTeIs0vv4_9B5hsmnLsk9r930uDQLu_Y . I was amazed by just how quiet this little guy is. I kept having to walk down the driveway to the generator to make sure it was still running. In fact, the most annoying noise coming from the set-up is a high-pitched chirping coming from the pressure regulator on the propane line. I suppose it's possible my other propane-powered generator's pressure regulator is making the same noise, but the generator itself is so loud I've never noticed it. Build quality so far is excellent. My only nit is the service panel is a little tricky to remove. I feel like I might break off one of the plastic tabs when bending it back. I probably just need to work out the technique, so will not hold it against Champion.Next week I intend to fully load the unit to charge a large battery pack and will update this review if there's any problem (3000W continuous load vs a rated 3100W capacity while using propane). Absent any trouble there, I'm 100% pleased with this purchase.

4:12 FULL BRIDGE RECTIFIAA!!!!!!!!

The general conclusion might be right, but what the biggest flaw was in this analysis is that you did not use a variable load. All these motor types want to put out a certain voltage according to their speed and a certain current according to their torque. If you dont draw the appropriate current for a given rotation speed, you are either drawing too little current and not much of the available energy is really converted into electrical power whereas mechanical friction is not reduced. Or you are drawing too much current and your winding losses are bigger than they should be. Each motor has an optimal current draw depending on speed en motor constant, but if you use a power resistor you effectively fix the current for each voltage, meaning that this is partially an experiment testing what motor constant is best suited for using with the fixed resistor. Therefore you should ideally have a dc-dc converter in order to transform your load to that of the optimal value as seen by your generator.

Thanks Scott! Your explanations are clear, accurate and really help in understanding what's going on. Much appreciated! Love your channel.

Great Scott! I made some discoveries after watching your video and playing around with a DIY windmill for driving garden lights. The efficiency of a stepper as a generator, can be somewhat improved by using a three-phase rectifier instead of a double full diode bridge. This is because a three phase rectifier uses 6 diodes instead of 8! Other than that I found that DIY diode bridges do not perform as well as packaged ones, maybe im just using some bad diodes...

_FUULLLLL BRID..._ *sechspuls Brückenschaltung*

Enjoyable experiment, but I disagree with your conclusion. A gearbox is rarely a good option for a generator project, it wastes power and makes noise. The real answer is to disassemble and re-wind the BDLC motor for a much lower kV and this also opens the possibility of changing from star to delta winding, which may suit a charge controller for a wind turbine better. Idea for your next video perhaps..??!

you should do a whole vide on the Odrive. the things it is capable of are insane. The idea of using a BLDC motor as a stepper with the accuracy of a stepper and the torque of a BLDC is pretty cool.

Thanks for doing this, I don't have an oscilloscope. Looks like getting much energy out of these small motors is difficult. I will look to my solar panel for trying to generate DC power.

4:37 if you see as German an English video and hear there suddenly a German word :)

Its strange to see the BLDC having such a low efficiency, since they are basicly the same type of generators used in big power stations. They should be able to reach efficiencies up to 99%. Here are 2 Ideas what when wrong: 1) The rectifier diodes give a huge loss due to their forward bias voltage. Around 1.4V lost on the diodes. If we go with the 2V Output Voltage that means roughly 3.4V were at the input, which gives a huge efficiency boost. But its still relatively low. why? 2) The mechanical losses are huge in this system, especially with a gearbox. A good test to see how big these losses are is to disconnect the electrical load and then record the power consumed. If you put 6.8W in with the electric load attached, but say 4W without the load, you have mostly mechanical losses which needs to be taken into account. In principle most motors can be modelled to a good approximation with an a friction element which power loss is proportional to the shaft speed, an ideal generator which converts the rotational power to electrical power (to be precise: it generates an output voltage based in the input speed and generates an input breaking torque based on the output current) and an internal resistance to model the electrical losses, mostly only depending on current. If you vary the load while keeping the shaft speed constant you can estimate this internal resistance (by taking measurements at different currents and recording the voltage). Same goes for the mechanical losses by using a fixed electrical current sink (to keep the electric losses constant, even zero current aka open circuit works here) and looking at the input power. By performing all these steps in various configurations (with generator, without generator, with load, without load, etc) you should be able to get all parameters (mechanical losses P/w, motor constant k, electrical losses R) for both motors/generators. Also it might be possible to get a "dumb" esc (one which does not measure current but just uses the BEMF) to trick it into behaving as a generator-controller. So instead of taking current from the supply to turn the motor it would slow down the motor but feeding back current into the supply. That way you eleminate the diode losses and have a more reasonable DC voltage level.

Thanks for this!... I was just about to run the same kind of testing for my wind turbine project. Now I don't need to! One thing I have discovered about stepper motors (which I've been using... was considering a BLDC but after your video, no need) is that a NEMA23 generates a lot more power than a NEMA17 at low RPM's. I'm getting 9 watts from my wind turbine at the moment in field tests. I believe the reason that steppers work so well is because they have a kind of "magnetic gearing" because of the 'teeth' on the stator and poles that effectively multiplies the number of real coils. It's all about the dB/dt. (change in magnetic flux over time)

This is perfect just what I needed to see! I am putting a motor on a wind turbine I am designing and spinning the motor with the turbine will turn it into a generator and I wanted to know what motor to use! Perfect timing

Hey, I think that the DC motor is easiest to use in a beginner's project simply because it already outputs DC and that parts to couple the shaft are easy to find.

GreatScott! I would like an episode of DIY or buy generators.

Love these videos GreatScott. Keep up the good work 😀

I cant thank you enough, this is going to help me pass my DT gcse this is so helpful thank you sosososososooo much i love this video!

I use the Gimbal brushless motors as these range in the 30-50kV range. I use these on my Lenz2 3D printed wind turbine, and at 150rpm with a 5:1 belt drive I get something in the order of 30 Volts. I am currently using the Hobbyking 6508 Gimbal motor which is about 30 euros. If I want more it gets quite a bit more expensive at 50-90 euros for a 85 or 90mm stator. I also drive these with a full bridge rectifier for 3 phase into a grid tie inverter. The drawback of the gimbal motors is the high resistance of ~10 Ohm, so you need more then 20 Volts to get decent power out. So far I've seen a peak of 34Watts.

jaja, die sechs-puls-brückenschaltung. wer kenns sie nicht...😂👍 but as always: fantasic video!

I did some tests many years ago with brushed tape drive motors, and simply connecting one to the other allowed one to drive the other at better than 10:8 rpm, so ten turns of the generator gave 8 turns of the identical motor from close to zero rpm, higher than 100rpm it reached 9:1. Those motors were about as good a any brushed motor can get, and I didn't measure torque loss, but it still proved the efficiency to be close to perfect. I also made a small charger system for a stationary engine using a BLDC motor, and got surprisingly good current and voltage (~60 watts) with 3600 rpm speed.

This was something i was really curious about, thanks!

9:33 Yup, that is the right one!

Hi Scott, seeing this, btw a great video as always, I was wondering: how could you control the output of a generator in a DIY project? What if the load isn't constant?

Love the videos! Although I have no idea what's going on most of the time, you were still able to keep me interested and entertained! Good work!

Thank you for this great video. The shaft coupling made by 3D printing is not suitable cause it does not help when the two motors axes are not aligned, while the original metal one does because it has these cracks. Because of this the vibration happens when you connected the brushless motor.

Brother you are really greatman

Fantastic, dude! Hand crank project coming? 🤔

Exactly the type of video I was looking for! Thanks

Finally, a video that I've waiting for so long!!

I don’t know how I got here. I was a chemE major. I like physics. I like making things. Now all I do is watch videos on UKposts about electricity and motors.

"would have rotated with an rpm of around 7310" thats quite specific

Nice and informative. I'm really surprised to see how much power was generated from the stepper!

Nice gob. I always learn sooooooooooooo much from you! :-) Keep it up!

So basically, go big(in rpm) , or go home. The Stepper motor seems to be the best option simply due It's sheer number of poles.

Lol ich verstehe fast kaum was (nicht weil du Englisch redest) aber es ist interessant was du da machst :D

I had a little play with stepper motors as generators. The best circuit for a motor with 2 coils i figured out is one bridge rectifier with both the coils in series connected instead of one. At the middle node of the coils connect a relative big, low esr, low voltage loss capacitor and connect the other end of that capacitor to plus or minus of the battery, depending on what you prefer. Instead of a full bridge rectifier for one coil (and then maybe putting the outputs in series), now each coil has its own two seperate pair of half bridge rectifiers (Delon circuit), what is somehow paralleled to each other. A pair of half bridge rectifiers puts the positive and negative part of the ac input in series and creates a virtual mass, while a full bridge rectifier puts them in parallel. That also means, if seperate diodes are used,... two coils of a stepper, each with a pair of half bridge rectifiers and caps and that in series, we can even reach >=4 times the voltage of a single full bridge rectified coil, reduce losses and parts we need. by using 6 diodes and 3 caps, it is possible to have two Delon circuits in series and parallel at the same time to make maximum usage of the two coils of a stepper. something to draw...

Great video as always. I would love to see you make a cheap DIY Arduino based handheld console.

4:39 sorry, but I think you pronounced the full bridge rectifier wrong.. it‘s called „ *FUUUULL BRIDGE RECTIFIERRR* “. Anyways... great video!

I think a 2 phase AC motor would be the best. It is simple like a DC motor, but without mechanical losses or wear and tear.

Great info! I use bldc motors in my rc cars, and want to learn and understand electric motors. Thanks!

Great video sir! Informative and direct! Love it!

5:10 Dude, why not just enlarge the hole to 8mm in software lol

Nice video like always, but why you can not use the regenerative breaking of the vesc to calculate the power that produce?

Incredibly Helpful, Thanks

I've be so excited to see it when I was in school ^^

Gimme da meetaa Oh wait,wrong channel, by the way ,great and clear explanation ,thumbs up from me

Yeah! I love your videos! Keep up the good work dude

Hello scott I can ask you to make a controller for inverter motors of washing machine and if you could explain the operation of the controller and the hall sensor, they are very sensitive pieces to get in the trash and are very efficient engines for multiple uses, I dedicate myself to repair plates of washing machines and I'm trying to make a controller to test inverter engines but I do not come with the knowledge I follow you all the videos you are a genius !!! I admire you and I thank you for all the knowledge that you share from Argentina greetings

Thanks buddy. Very helpful as usual

"so I downloaded another shaft coupler" Future is really here guys

Loving the outro enthusiasm!

Your videos are the best!

Thank you electro boom;)

5:05 is me dealing with life problems

I don't understand some of these staff because i am commerce student. But i love your every video and your experiment. I have so much interest in electronics.

Man I LOVE your videos

How is this video 22 hours old and it only showed now on notifications I'M SHOOK

It is unfair to ignore the mechanical loss of the gearbox. Stepper motor looks like a winner because it operates at low speed and virtually no mechanical loss. Perhaps you can use 2 identical motors, one as motor and another one as generator. If both shares the same energy conversion efficiency, x/100 and x/100, the total efficiency will be like n = (x/100)*(x/100) and x = √(10000n), ignoring rectifier loss. That way will be much more accurate.

Thanks for a comparison test of the three kind of motor to find the most efficient generator

Top info. Many thanks 2U.

Love how we all also watch ElectroBoom.

Though I have learned a lot from your channel, love watching all of your videos but now your videos are becoming more about failures and less of completed projects. I appreciate the effort though. Good for beginner hobbyist though.

Many thanks for making this video..which motor works best for grinder & grass cutter?

Power measurement should have been done by using an optical tachometer and putting the motors on a reaction torque-arm with a scale to measure the torque. Otherwise, really appreciate the video and the work you put in here !

I agree with the conclusion, but your testing with a geared DC motor was a bad example, so the whole experiment was kinda unrelated to your final opinion...

Your videos safe me from the bordom of church 💯💯💯

Awesome. Informative. Great presentation.

Haha thank you so much great video and very informative!!! Thank you!!!

5:14 *uses a drill to enlarge the holes instead of doing it in Tinkercad *Me : NO GOD PLS NO NO.... NOOOOOOOOOOOOO

The motors, windings, magnets ate too dissimilar for comparison.

Hello Scott, nice and professionnal video ! for a 24v 10Amp wind turbine, which kind of motor would you recommand ? thanks.

This is really great video! Thanks!

What did you say at 4:36?

4:12 you pronounced it wrong, it is FFFUUUULL BRIDGE RECTIFAYAAAA!!!!

Hi Great Scott. Awesome video as always. Can you perhaps make a video explaining how to calculate power consumption of electronic devices using an arduino please.

Wow, thanks for sharing 😀👍

I always laugh when people think they discovered something, like attaching a motor to a generator and power back to motor for free energy.

Ich Habs mir schon bei deinem Akzent gedacht... German engeneer 🤗

I liked how you said "but of course that would fit the BLDC motor shaft."

Another Great Project😍😍😍

Gimme da scope plz

SECHS PULS BRÜCKENSCHALTUNG

Very informative video! Liked! Curious if you can answer a quick question. What is the significance of the stepper motor’s coil resistance rating? Does a higher number for resistance mean it’s harder to turn - for example a 32 Ohms motor would require more force to spin than one rated at 1.5 Ohms? Thanks!

Very informative Thanks

I alwayas like your openion Thanks for this knowledge

Thank you that was great information

Very nice Content as Always :) Could you imagine a E-Bike conversion with recharging by recouping all break energy? my guess would be stepper motor because you dont need a conversion in gears or BLDC with a plastic cover gearbox with a hidden GPS tracker that wouild be a dream against Thieves lol

It would have been quite interesting to see what happens if the BDLC Motor(Generator) was connected with the other motor more permanently, so that it would be possible to run it on higher speeds

Your an absolute savage with a highlighter pen... Nice video!

Can you do video about lamp types and their components like balasts starters and other stuff. Maybe compare lamps? Like Sodium vs Mercury or something similar?

Thank you 😊 sir . All videos are awesome

I love your videos, GreatScott!. I have to ask, why did you 3d print a coupler and enlarge its hole instead of just drilling the aluminum coupler?

This is a good introduction, THUMBS UP ! I want more information about making a usable generator. may I put a suggestion into the suggestion box ? I want to power my ESP8266 garden sensors. my thoughts are to use a cell phone power bank and charge that with solar and wind, then use it to power my ESP for weather data.

Awesome video, learned a lot

Hay! You have make my consept one step forward. Thanks

Great question and great video! I am fascinated with your penmanship. Thumbs up, as usual. Now out of the larger motors, such as an appliance universal motor, and a treadmill-size DC motor, which is more efficient as a DC generator and are they as different in efficiency from each other? I assume both would not have gears, only the motor.