Search found 58 matches

by stan.distortion
Sep 18 2019 5:35am
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 580
Views: 27680

Re: APL's DIY axial-flux motor

... Stan.distortion what gain would you expect from a curved winding ? How I see it is that the closest it is to radial direction the more the force contribute to usefull torque. So the inscrease in infill may not be beneficial, since the more torque producing part (outer radius) is the less radial...
by stan.distortion
Sep 17 2019 10:58am
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 580
Views: 27680

Re: APL's DIY axial-flux motor

If you haven't already looked into 3d printing then I'd highly recommend it, incredible process and very useful but even more important imho, it gives a major change in perspective to anyone coming from a conventional engineering background. Many of those crazy "yeah, but how the hell am I going to ...
by stan.distortion
Aug 22 2019 6:23am
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 580
Views: 27680

Re: APL's DIY axial-flux motor

I'm looking into a coreless motor with a field wound rotor, a thin disc with the windings running at pretty much the same angle as the slots in that pic. Not sure if it will work though, aiming at something lightweight and 3d printable but just back of the envelope stuff for the mo, still have to g...
by stan.distortion
Aug 20 2019 1:57pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 580
Views: 27680

Re: APL's DIY axial-flux motor

Sand blasting or vibratory polishing should clean up machined surfaces ok. Sand blasting should be an easy one to source but it's likely to spread the laminations (get embedded between them). Vibratory polishing would be a bit harder to source but wouldn't cost a whole lot to get set up with and wou...
by stan.distortion
Aug 20 2019 12:14pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 580
Views: 27680

Re: APL's DIY axial-flux motor

Not a bad idea. I've seen some similar designs using a big roll of iron. Drilling might be a bit challenging and might short the laminations around the holes. In practice, these kinds of shorts don't seem to create large losses because they are very thin. Axial Flux Stator2.jpg Yeah, seemed like a ...
by stan.distortion
Aug 20 2019 8:50am
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 580
Views: 27680

Re: APL's DIY axial-flux motor

Cheers for the info, this thread is turning into a seriously useful resource for anyone interested in building their own motor :bigthumb: Another thought on a roll of strip as laminations. So individual rolls wont work (the blog linked above also has some diagrams relating to why in the most recent ...
by stan.distortion
Aug 15 2019 4:49am
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 580
Views: 27680

Re: APL's DIY axial-flux motor

Also, it's still unclear as to whether carbon fiber sheet would be eddy free,.. it's the strongest, and probably has good thermal transfer? Not sure what the cost might be though. I think I remember hearing carbon fibre has interesting magnetic properties and could be used as a lamination material ...
by stan.distortion
Aug 04 2019 5:36am
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 580
Views: 27680

Re: APL's DIY axial-flux motor

What pole count are you using, 21-26? Drew it out earlier and couldn't see how it could work with 3 phases, seemed like the only way it would work out was with a phase for every pole but I'm no expert, still trying to figure out the basics. Had you considered (or come across) using multiple controll...
by stan.distortion
Jul 30 2019 5:58am
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 580
Views: 27680

Re: APL's DIY axial-flux motor

I was afraid that people might get that impression from the photo. I tried to find a picture of Michale Faraday's induction furnace, but it's rare, and the print above is basically the same thing, a shorted out homopolar generator,.. or what we just call a shorted generator, which of course, is goi...
by stan.distortion
Jul 23 2019 4:47am
Forum: E-Scooter and Motorcycle General Discussion
Topic: torque steer
Replies: 8
Views: 243

Re: torque steer

Have you tried reversing things, swapping controller outputs (and sensors) or motors/controllers if cables are too short? If you can get a logging output from the controllers it should show what's happening but if not then swapping things over will tell you if the issue is with motor or controller (...
by stan.distortion
Jul 12 2019 7:25am
Forum: General Discussion
Topic: Delete facebook for the good of humanity!
Replies: 17
Views: 921

Re: Delete facebook for the good of humanity!

+1, they're getting into virtual currencies now too (banking licence was issued in 2016) so they'll have transaction data available to the highest bidder before long too. Rule of big business and social media, if you can't see what they're selling then what they're selling is YOU.
by stan.distortion
Jul 01 2019 5:42am
Forum: E-Vehicles General Discussion
Topic: Sinclaire c5?
Replies: 8
Views: 544

Re: Sinclaire c5?

Wierd, the forum search now appears to have a bug, where if you use a word that's too common, or too short, it doesnt' just ignore it (like it used to), or give a specific error about that term, it just fails to return any results at all. :roll: Leaving "of" out: https://endless-sphere.com/forums/s...
by stan.distortion
Jun 30 2019 5:01am
Forum: E-Vehicles General Discussion
Topic: Sinclaire c5?
Replies: 8
Views: 544

Re: Sinclaire c5?

Not really...just that in general people prefer big heavy gasoline-powered vehicles, because that's what they're used to having. EVs have been around for over a hundred years...probably closer to 150 by now. Check out the Horses of Iron thread, and other similar threads. Also, there's a few posts a...
by stan.distortion
Jun 29 2019 7:36am
Forum: E-Bike Non-hub Motor Drives
Topic: Dave's 80:1 RC mid drive kit build log
Replies: 1398
Views: 183322

Re: Dave's 80:1 RC mid drive kit build log

Thanks. Did some playing around with that afterwards, bearings as roller teeth would probably work but adds loads of weight so not much point. Some hydraulic pumps/motors use the same kind of thing and many have hardened rollers as the outer teeth. Tolerances are extremely tight on the hydraulic mot...
by stan.distortion
Jun 28 2019 4:25pm
Forum: Motor Technology
Topic: Ferrite as a stator material?
Replies: 20
Views: 2472

Re: Ferrite as a stator material?

I know i'm a little late to the conversation but I might be able to shed a little light on the topic. As was mentioned above, ferrite only makes sense for high frequency applications where minimising core losses are your main concern. This is because of its low saturation magnetisation, which is ty...
by stan.distortion
Jun 28 2019 8:54am
Forum: E-Bike General Discussion
Topic: fitting a motorcycle fork onto a bike?
Replies: 29
Views: 4390

Re: fitting a motorcycle fork onto a bike?

Some of the 50cc forks might be worth looking at but I doubt it, more or less all put cost before quality, heavy for what they are and poor damping. Girder forks are worth considering, kind of surprised they're not more common tbh, light, relatively simple, MTB rear shocks should work well with them...
by stan.distortion
Jun 27 2019 5:09am
Forum: Large EV General Discussion
Topic: Aussie EV Autocross Special
Replies: 333
Views: 34049

Re: Aussie EV Autocross Special

Cheers for the reply and sorry for the terse post, was rather drunk at the time and thinking out loud. Also read through kiwiev's Sonic thread earlier (hot damn, I'd sleep with that car!), dual motors on that one and had a mish mash of thoughts on the possibilities. Not sure how the "standard car" p...
by stan.distortion
Jun 27 2019 4:11am
Forum: Motor Technology
Topic: Power Spikes - Modifying Ninebot Controller
Replies: 9
Views: 529

Re: Power Spikes - Modifying Ninebot Controller

From what I gather it's largely rpm related, e-skateboard folks seem to get it a lot when going faster than the ESCs peak speed, ie. coasting downhill and often unexpected, like someone hit the brakes hard. Could be I'm on the wrong track entirely with that though, might be getting mixed up with VES...
by stan.distortion
Jun 27 2019 4:04am
Forum: E-Bike Non-hub Motor Drives
Topic: Dave's 80:1 RC mid drive kit build log
Replies: 1398
Views: 183322

Re: Dave's 80:1 RC mid drive kit build log

Beautiful work, subbed :) Mind if I pick your brains on something? I was thinking of this type of reduction for in-wheel drive on a very light 4 wheeler (trials car, space saver rims with motocross tyres). Seemed like it could be mounted on multiple cranks/eccentrics to leave the centre open for off...
by stan.distortion
Jun 26 2019 6:19pm
Forum: Large EV General Discussion
Topic: Aussie EV Autocross Special
Replies: 333
Views: 34049

Re: Aussie EV Autocross Special

Did you look into torque limiting/traction control? Makes the case for 4 independent motors and controllers, a leapfrog ahead of infernal combustion 4x4. The WRC cars are an example, the damn things can almost do ballet thanks to their traction control systems but they're limited to operating brakes...
by stan.distortion
Jun 26 2019 4:26am
Forum: Motor Technology
Topic: Power Spikes - Modifying Ninebot Controller
Replies: 9
Views: 529

Re: Power Spikes - Modifying Ninebot Controller

I'm no expert in circuit design but from what I gather ESCs blowing up under braking is a fairly common issue and as far as I can tell it's usually due to latch up, the gate voltages get high enough to turn themselves on. A "double pulse test" seems to be a good method of evaluating how well an ESC ...
by stan.distortion
Jun 25 2019 9:42am
Forum: E-Bike General Discussion
Topic: charging Li-On battery in winter - looking for heating element
Replies: 8
Views: 380

Re: charging Li-On battery in winter - looking for heating element

Beer warmer! Used for homebrew, usual very low wattage but maybe a little more pricey than other options as most home brewers use aquarium heaters instead. The more popular temperature controllers are well worth a look though, Inkbird ITC-308 is the model I'm using and very happy with them, plug in ...
by stan.distortion
Jun 24 2019 12:11pm
Forum: Alternative Energy
Topic: Liquid Fuels Made By Sunlight
Replies: 14
Views: 1611

Re: Liquid Fuels Made By Sunlight

.... Yep. The one big plus that ethanol has is that it works with a wide variety of plant material. But it's not very energy efficient. In energy terms it has a low EROEI. About the only time it makes sense is when it's used on plant matter or waste that would otherwise be discarded. For biofuel cr...
by stan.distortion
Jun 24 2019 11:35am
Forum: E-Vehicles General Discussion
Topic: Mercedes new ISG system, with 48V lithium battery
Replies: 7
Views: 635

Re: Mercedes new ISG system, with 48V lithium battery

The same thing was used very early on with hybrid designs, around 1910 to 1920 several used a generator/motor between engine and gearbox that also worked as a starter motor. The turbo spooling motor's interesting, was thinking of testing a motor driven turbo compressor section but it would need a hu...