Tiny 1kW Electric Bike Motor

this is a 1000 watt drone motor it weighs just 40 grams and this is a 1000 watt e-bike motor it weighs 6 kilograms but is it possible to drive an e-bike with a motor this small this video is sponsored by onshape more on them later now when i say these are both 1000 watt motors i'm using the data provided by the motor manufacturers so to be precise the drone motor is rated to 928 watts and the e-bike motor is probably rounded to the nearest kilowatts but there's more to the specification than just the power for example this tractor has the same horsepower as a nissan gt-r but the nissan has a top speed of 195 miles per hour and the tractor can barely reach 25 and this is very similar to the motors we are comparing the e-bike has a top speed of 28 miles per hour and has a wheel diameter of 26 inches this means that at top speed the e-bike motor spins at about 360 rpm but the drone motor can spin up to nearly 30 000 rpm this causes a bit of an issue because if we were to spin a 26 inch bike wheel at 30 000 rpm the bike would be going faster than the sr-71 blackbird so we need to gear it down a little to spin the wheel at a more reasonable speed an 11-tooth bike sprocket has a diameter of roughly 5 centimeters and to get a ratio of 80 to 1 which is what we roughly need to convert the 30 000 rpm down to 360 rpm means we would need a rear sprocket with a diameter of roughly 4 meters which obviously isn't possible but instead we can use a series of belts and pulleys to bring the rpm down on the motor side before attaching the chain for this specific application i'm going to use a 4 to 1 pulley ratio straight off of the motor and then another 4 to 1 ratio to the output shaft this means the output sprocket will spin just under 2000 rpm and because my previous super capacitor bike project required a large rear sprocket too when combined with the pulleys we should have a final wheel rpm of around 360 which matches the e-bike perfectly so let's start designing these pulleys using onshape which is a cloud native cad system if you're familiar with using cad software's already onshape is very intuitive to use with its labeled tool menu and clear parts list and also includes industry leading manufacturing specific features for sheet metal frame based design configurations and detailed drawings but unlike many other cad softwares onshape works in a browser and is accessible across all operating systems as well as ios or android devices and because it's cloud-based you no longer need an expensive computer to run it and all your work is backed up on the cloud so you won't lose anything if your computer freezes or crashes it also allows you to collaborate with teammates or vendors on the same project at the same time which is why engineering teams at companies like formlabs dhl and trek choose to use onshape and if your company uses a cad system i highly recommend you try onshape at onshape.pro forward slash tomstanton or click the link in the description down below the next step is to make the mounting plate for the motor and pulleys which i cut from aluminium on my cnc router this could then be clamped to the bike frame using a couple of 3d printed brackets and we can then start mounting the components starting with the output pulley which i've attached to sprocket to using a few bolts this can then be attached to the main mount with the shoulder bolts which is essentially a precision shaft bolt that the bearings will spin on i can then fit the bike chain and tension it accordingly by sliding the mount along the frame so with the belt fitted the center pulley can then be attached in a very similar way and can be tensioned using a small idler bearing in this slot and finally we can mount the drone motor and see how well it turns how does that look with the hardware complete it's time to fit the electronics that'll power the motor as well as a small arduino board to convert the analog throttle signal into a digital signal that the drone motor controller is designed for perfect man look how good wiring that is here we go [Music] that has some power though like i can feel the wheel there's some talk in there first test hey look at that [Music] just moaning oh dear oh the chain's coming off just look at it it's ridiculous how small that little motor is so baby oh no oh dead i can smell it it doesn't smell good i think we need a slightly bigger motor oh yeah that is yep you cook an egg on that smells but it smells really bad doesn't it so we obviously need a new motor with some more torque but also one that will fit the current motor mount so i found this motor which is also designed for drones and is only slightly larger than the previous motor however the difference is that it only spins to 15 000 rpm instead of 30 000 rpm in theory with half the amount of max rpm the motor should output double the amount of torque for the same power now i say in theory because the thousand watt ratings on these motors are actually for the electrical power and not the actual physical output power so the only way to find out is to give it a test i also move the motor and pulleys to a different part of the bike to shorten the chain as well as stopping it from rubbing on the frame which should hopefully reduce the chance of it coming off it's plagiary i think that's quite a bit more power now let's see how this goes good luck sir thank you oh she's going for it [Music] but the problem is the chains i need to tighten the chain let's have a look it's really loose because the chain's so loose it hits his pulley you see there it hits the pulley so it's actually like worn if you look at the belt here it seems like one right there you can see it just focus on obviously didn't design it to be mounted here you need one of those like little little bobbins there yeah hold it up just sit up there like that i reckon tension the chain a bit more though yeah be right for another run oh my god that was top speed that was it looked quick it was uh my watch was saying just over 20 miles an hour really it's pretty good that's really good just for a little baby do i have a go maybe warm is it warm uh yeah i just about can hold it without 40 or 50 degrees or 50 degrees or so yeah i mean that's still safe temperature for a motor yeah right pedal to get going uh you can use the motor you have to pedal just do a little bit oh this is crazy that's fantastic it's all right isn't it loads more talk than i expected i thought it would take you ages to get up to speed but just shoot straight off that's actually really impressive is it hot oh yeah that's warming is it really hot uh it's pretty warm don't grab it like i did yeah so would you uh ever buy a drone-powered e-bike maybe so i'm sure you're all wondering how does this compare to the e-bike motor well let's see with the drag race [Music] oh that's really hot ow oh wait i've i think i might have melted the coils yeah that's the absolute limit of that motor and the hub motor is feels cold same temperature as the bike frame absolutely freezing so to answer the question yes you can power an e-bike with a tiny drone motor but would i recommend it probably not thanks for watching

Channel: Tom Stanton

Views: 4,353,105

Keywords: electric, electric bike, bike, ebike, drone, motor, engineering, physics, 3D printing, speed, vehicle, cycle, bicycle, gear, chain, 1kw, 1000w, electronic, DIY, homemade, electricity, ebikes, e-bike, mountain bike, road bike, bikes, drones, fpv drone, best drone, electric motor, diy projects, do it yourself, motorbikes, motorbike, homemade inventions, inventions, invention, diy inventions, engine, engineer, mechanical, gearbox, mechanic, race, power, torque, battery, wiring, throttle, wheel, diameter, sprocket

Id: P5uUyUWpP_I

Length: 10min 37sec (637 seconds)

Published: Sun Jun 12 2022