3D Printed Brushless DC Motor 

Showing the output from manually spinning the motor is a brilliant demonstration.

I’d have worried about shrapnel flying off, considering how the metal parts are secured.

I think you have more skill then what you give yourself. Making a controller from scratch is remarkable .Can you show the circuit on paper next video

I had no idea I could use things I have laying around to make simple BLDCs. Such an eye opener.

It feels so good to see you back! Do more uploads pls. Great Vid as always🤩

The absolute clearest explanation of BLDC and controller design I've seen ... And it's axial flux. Thanks!

I have been trying for almost a year to wrap my head around the actual mechanisms that make a DC motor work. I’ve likely watched almost every video on RU-vid on this subject but wasn’t able to ever fully grasp it - that is until seeing your video. This video and your demonstration just made everything click so well - as another said - the best bldc video on the internet. Very simple and well-explained. Thank you for your work.

Nicely done! Cool little project. The motor shaking at around 10:18, was due to it hitting some resonant frequency.

It's really amazing to see someone wind a magnet and do their best to keep the lines parallel and the coil as tight as possible! There are so many people who just lazily wind magnets and it's infuriating!

You can use an odd number of permanent magnets if you have them all the same polarity and have the drive coils alternate polarity. Then you can drive it at half duty cycle to push it away from one and towards the other with one switching element. Then you could use a H bridge to make it 100% duty by reversing the polarity every other cycle. I've built a couple of motors like this with success.

This was the most educational motor video I’ve ever watched. Thank you. I loved it

props to you! what a cool project! Every step in this video depicts what I love about engineering

Awesome little motor, and one of the best narrated I've seen.

It’s so well balanced, even though I didn’t see anywhere n your build were you did anything to balance the rotor. Really nice build.

Great description on the sine wave and awesome results

Great work! I always enjoy whatching someone that really knows what they are doing!

Nice design. I have found that magnets will come out from friction fits over time, so I now slide them into a slot, rather than friction-fit. I make the slot have 1 layer of 3d printed plastic, like 0.1mm or 0.2mm between the bottom of the magnet surface to ensure the can't come out. I even found that crazy glue isn't even good enough as it won't stick to the nickel coating on the magnet that well.

first video ever that i've seen of yours, and i have to admit, you got me boy

That is nice how it functions without any ferrous cores! Designed a pancake coil PCB recently and it would only get hot when about 1A was running through it. Didn't magnetize much if at all so far.

Very nice, I never had all this technology available when I studied electrical engineering 50+ years ago!

Excellent work as always!

Custom controller is sick brah. Going to find another video that dives into that. You are a real G

Wowzers. Sounds like a spaceship. Good on you

Awesome project, well done!

You can also operate it with an electronic speed controller (ESC). I guess you have eddy current losses in the core screws of the coils. The coils should not be too long. You can use FEMM to have a look at the magnetic field distribution of the permanent magnet disks. You can use a magnetic manifold disk made of low carbon steel at the opposite site of the permanent magnets to the coils to increase the magnetic flux. FEMM shows that it helps a lot. The best ist to use a rotor with two permanent magnet rotor disks with magnetic manifolds at both sides of the coils. The coils should not be longer than the length of the permanent magnets. In order to get a good flux penetration, the inner diameter of the coils should not be smaller than the outer diameter of the permanent magnet disks. You can use FEMM for motor optimization. It is a trade-off between maximum flux through the coils and minimum coil resistance. Using more height for the coils will reduce the coil inner resistance but also drop the magnetic flux through the coils. I've found that 6 coils and 8 permanent magnets is a good number. If you need more motor speed, you can reduce to 3 coils and 4 permanent magnets. If you need more torque you can get to 12 coils and 16 permanent magnets. You can make two of these motors to use one as a generator for a dynamometer for power tests. You can break the generator by use of a 3-phase rectifier and an active constant voltage load to set the break operating point to a more or less constant motor speed. Until now you just operated the motor under idle conditions, not under a break load. You have to consider that not the motor speed is important but the power and the efficiency under a certain motor speed.

Super helpful and well presented. Thanks!

I adore the sound of it spinning up at low speed

Nice design most of the esc i see on youtube are very complicated but yours is easy and simple.

Great job pal. nice little motor...super fast. working on something similar.

Nice project. But DANGGGG!!! Love that scope!

Might try and build this one, been getting into 3D printing recently, boy is it a tinker. I feel like there are 20 puzzles to solve before getting consistently accurate durable prints. Last was bed adhesion, now I’m working on dimensional accuracy. Spent ten hours on an aerosol design and it was way off

Excellent! What a funn project

Great video! Miss a few more lectures and provide us with a few more videos please.

congrats on the 100% dude! you earned it!!

My god i love i can watch this type of content on demand

this was very useful and entertaining!

Great work-SUBSCRIBED !!! 😊

You should upload those sounds it made without the music, really beautiful stuff

I've had a lot of success with putting air core coils on both sides of the magnets. This eliminates hysteresis from metal cores. It also "pinches" the magnet between the two coil fields instead of thrusting against the bearing, eliminating lateral bearing loads. The smaller the coil/magnet gap, the more force realized. Hope these ideas help with your next version :)

I hope you got an A! I love how you use your fingers as temperature probes. Good job at adjusting for minimum smoke. 😃

Well done!

Wow those rigol visuals are like visuals at a rave party. Maybe better. So pretty.

Pretty dang impressive. 👌

Cool intro mate! And cool project!

that was so cool!

Mind Blowing! You pushed this thing to rotate! Now seriously. Some effectiveness measuring, or, may be, Hal sensors for feedback, or something not so childish. Nothing.

We need more.

You made an axial flux motor as extra credit?! That's both insane and awesome!

Pretty dang cool, but you might want to test things within some sort of lexan box or at least have a scatter shield up for yourself in case that thing grenades.

That motor is great 😃

Amazing

I wonder how much torque this little beauty could create with a small gearbox. It does have a lot of speed. Over 10k with a motor built from scratch is nothing to laugh at, that's fricking impressive at the very least.

A good scale up might be arranging your permanent magnets in a halbach array. This arrangement causes the magnetic field to focus toward your stator electromagnets. It might be interesting to see how much this enhances the motor efficiency. Field strength from the permanent magnets would be somewhat stronger for more mass in magnets. Then an identical arrangement on the othe side of the rotor to make full use of the stator magnetic field.

very very cool!!

You should modify the 3D print for the rotor and add fan blades, I wanna see what kind of CFM it can hit. You should also measure what torque it’s producing

I am so glade no magnet hit you

You can make your design more efficient by making your coils oblong/ovoid shaped, or triangular; And getting bar shaped magnets and pressing them into a drum shaped rotor, set inside the coils.

After your impressive explanation i can finally get rid of my combustion engine in my car and replace it with a DIY brushless motor. Future is now.

Wish I would’ve been recommended this channel before I invented the worlds most complicated esc lol. Nice video! Subbed

Классная работа!!!!

Thats amazing XD I wanna try tossing one of those on an rc plane and see how it does

I think you got your extra credit.

Amazing! But i really need the driver circuit now!

You make amazing videos From an engineer

You are brave sitting that close to spinning magnets that can fly out at 12k rpm with no shielding.

Wow, such RPM seems pretty remarkable for such design to me. I wonder if it could get even better if you added second plate with magnets on the opposite side.

It hurts, when i have to watch it to the end.

youd probably be able to go much faster if you had a feedback loop so that you can accelerate the fastest without loosing syncronization as with your open loop, all you need is 6 resistor and 3 ADC pins on your arduino.

Well, they weren't SAFETY glasses, but at least he kept going till it failed. 😀 Excellent work!

To limit the current at the start you should implement u/f=const

good I will subscribe to he's channel

I always wonder what is the efficiency of such motors and how does it compare to manufactured ones

Nice!! I think luck may have been A factor in the balancing. Still, Excellent!!!

It would be cool to se a version where the coils are on both sides of the rotor

Nice job! But if you're going for the "extra" in extra credit you should have built a charge pump for the high side gate drive and used all N-channel fets. We need over engineered not just working designs! haha

8:19 - Wow that is super quiet. Excellent explanation. Can you provide the mosfet switching circuit, why does it need P and N channel mosfets is it due to polarity?

Any faster and that motor would have become a claymore!

Awesome! I really love your videos, I meet you with those coil gun videos, are you going to work back on that one day? I really liked it 😅

Great Build! Would you mind sharing the BOM for the electrical parts and the code you used?

the sine wave is actually not the most efficcient way to drive a bldc motor. When the magnet is far away from the coil you want the maximum voltage thus torque on that coil.

Which course path are you in? Great video! Have a detailed walk through on entire project?

wow. next video, extracting materials from ores to build a car

Amazing job! I’d start looking into some kind of shielding or retention incase anything let’s loose. At 15k, assuming you have a 30mm diameter magnet circle, those magnets are doing 75 meters per second, enough to really break stuff if something happened. How does it work with a load? I’m not super familiar with motor design.

"i dont know what that was" *tinkers* "i turned her up lets send it" 😂this guy would do well racing cars.

Incredible work, this is so cool. I'd love to build this with my kid. Any chance you can share (or sell) the STLs or OnShape model and more detail about the build (coils, schematic, magnet sizes, etc). I love that you shared your cad model but it is "view only".

I hope you wear protective glases at 15.000 RPM, one of those magnets can come flying your way or a shattered plastic piece.

Hey dude, nice vid! Now add the second set of coils from upside! You'll double your power and usage of magnets! BTW 3d printing is mostly not strong enough for high performance motors.

That motor spinning up sounded so sci fi

That 2 magnet, 3 coil design has been shown to function? Seems the perm mags would maybe get stuck between 2 electromags.

It was great Can I ask what kind of metal is the metal part of the rotor of the BLdc motor, which has a magnet inside, that does not take the metal from the outside, even though it is not aluminum? Thank you in advance

Can you measure how much torque it produces throughout the range of RPMs?

lets advance that basic driving algorithm and run some foc. ;)

Kudos.. I give u an " A "

You just created a miniature version of mine! 😂 really cool to see! Awesome to see that you also made the driver with the arduino. On my motors I’m including hall sensors to have feedback for the startup. I encourage you to include hall sensors, I will be willing to help 👍

Looks good, but wouldn't it make sense to have a second set of coils above the permanent magnets?

Nice motor, now try addi g back emf regenx coils from Thane Heins quantum motor❤❤

Nice job! You ever watch any of lasersaber’s content? He does a lot of work with high efficiency motors and such

3:30 but... what happens when the motor spins fast enough to overwhelm the magnetism holding them together? Won't they fly off in all directions? 🤔

WHat gates did you use ? Im curious if the gate opening and closing delay has any impact on it trying to activate the motor if there is any delay at all

tem força que da para fazer algum projeto tipo bombinha dagua etc?