Search found 93 matches

by stan.distortion
Dec 10 2019 6:14am
Forum: Large EV General Discussion
Topic: Ideas for EV farm machinery
Replies: 53
Views: 2005

Re: Ideas for EV farm machinery

In the former USSR The Agriculture Electrification Institute did some tests and trials with cable tractors from 1949 to 1950s. Tractors had a 3phase 42 kW induction motor and pulled a 5-shear plough. Average power consumption was 45 kW*h per 1 hectare. Operational and capital costs for the electric...
by stan.distortion
Dec 03 2019 6:37am
Forum: E-Vehicles General Discussion
Topic: 4 wheel drive ATV as utility vehicle
Replies: 8
Views: 326

Re: 4 wheel drive ATV as utility vehicle

the 4x4 golf buggy type things They're typically called UTVs, and several electric ones are available: Polaris Ranger EV, Hisun Sector E1, Textron Prowler EV, Intimidator Classic EV. Yep, that's them. The US military had a similar class of vehicle back in the 60s/70s called the Mechanical Mule that...
by stan.distortion
Dec 02 2019 9:05am
Forum: E-Vehicles General Discussion
Topic: 4 wheel drive ATV as utility vehicle
Replies: 8
Views: 326

Re: 4 wheel drive ATV as utility vehicle

Had you considered something other than an ATV? They're very popular but in most cases they're not the ideal platform, the 4x4 golf buggy type things would often be better suited or maybe a light tractor converted to electric when pulling/pushing power is far more important than top speed.
by stan.distortion
Nov 16 2019 7:33am
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 832
Views: 48331

Re: APL's DIY axial-flux motor

For threaded holes, there should be some way of doing it. Fusion likely has a built in option and parts libraries would work, import a threaded part (threaded bar, a bolt, etc.) and subtract it from the part you want threaded holes in. Failing that they're easy enough to do yourself, draw out thread...
by stan.distortion
Nov 16 2019 6:48am
Forum: General Discussion
Topic: Converted alternator on ebike controller
Replies: 39
Views: 2333

Re: Converted alternator on ebike controller

If you're planning to build solar storage then 18650s could be a better option than RC lipos for the kart, get some practise on a small pack for the kart before moving to the big pack and it doesn't matter if you go over the top with the spec on the kart pack as any extra can go into the house pack ...
by stan.distortion
Nov 15 2019 10:08am
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 832
Views: 48331

Re: APL's DIY axial-flux motor

Dang! looking good. Learning a CAD program is on my bucket list too, but I don't think I'll ever have time until I retire. There should be a way to export the view, but you could also use Ctrl+Print Screen to capture the screen (or Snipping Tool) and paste into a photo editing program. I usually do...
by stan.distortion
Nov 15 2019 9:57am
Forum: General Discussion
Topic: Converted alternator on ebike controller
Replies: 39
Views: 2333

Re: Converted alternator on ebike controller

I got the batteries on ebay, not going to link it though because I'm pretty sure the spec was overstated. There are plenty to choose from on ebay but it would be worth hunting out reputable suppliers as batteries on ebay are a minefield, $200 should get enough power for at least a few minutes of ful...
by stan.distortion
Nov 14 2019 12:50pm
Forum: Polls & Surveys
Topic: When Windows 7 is dead in 2020 what OS will you migrate to??
Replies: 70
Views: 5898

Re: When Windows 7 is dead in 2020 what OS will you migrate to??

Just keep in mind that the majority of Linux users still use Gnome and it's the default for most major Linux distributions. The more you stray into custom desktops and less common installations the more problems and more expertise you are going to need to be successful. I also don't really see much...
by stan.distortion
Nov 14 2019 9:45am
Forum: General Discussion
Topic: Converted alternator on ebike controller
Replies: 39
Views: 2333

Re: Converted alternator on ebike controller

Yes, there's way more variance from changing the field current than you'd expect. The first time I hooked an alternator up with a variable power supply on the field (LM317) I was almost afraid to run it up to full speed, they'll often run at over 20,000rpm under the bonnet but it's scary to see one ...
by stan.distortion
Nov 14 2019 9:08am
Forum: Motor Technology
Topic: More than3 phases
Replies: 9
Views: 790

Re: More than3 phases

Any number of phases is possible, stepper motors commonly use 2 but 3 is about the minimum for smooth torque. It should be possible to wind many 3 phase motors to use multiple ESCs and it should also be possible to rearrange slot/poll combinations for 6 or 9 phases (with 2 or 3 ESCs), possibly usefu...
by stan.distortion
Nov 13 2019 10:34am
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 832
Views: 48331

Re: APL's DIY axial-flux motor

Congrats, that's damn good progress! :) Don't worry about the non-intuitive stuff, that's just one approach to that problem and there are several to chose from, it doesn't take long before considering which option to go with for every part of a model. Personally I'd do 3 2d drawings for that one, th...
by stan.distortion
Nov 13 2019 9:38am
Forum: General Discussion
Topic: Converted alternator on ebike controller
Replies: 39
Views: 2333

Re: Converted alternator on ebike controller

I can't find the thread I'd mentioned earlier on using an alternator as a motor :/ It might be on a different forum but all my searches are coming up blank so far, hope it's not gone for good as there was some really good info in it. Here's some of the dyno charts from it, iirc he was running a stan...
by stan.distortion
Nov 13 2019 7:37am
Forum: E-Bike General Discussion
Topic: where can I find a steel front suspension fork?
Replies: 17
Views: 1074

Re: where can I find a steel front suspension fork?

As others have said, if you want to add strength and keep the front suspension then go for a set of downhill forks. They're designed to repeatedly take loads far greater than you'll ever see with road or light trail use even if you weighed twice as much. Aluminium isn't inherently weak, it all depen...
by stan.distortion
Nov 13 2019 7:17am
Forum: General Discussion
Topic: Converted alternator on ebike controller
Replies: 39
Views: 2333

Re: Converted alternator on ebike controller

Starter motors are no good, they're designed to work for short bursts only and even at that they're not particularly powerful. Car starters typically put out between 1kw and 2kw and will overheat if run for long, it would be possible to re-configure them for constant duty operation but it wouldn't b...
by stan.distortion
Nov 10 2019 10:33am
Forum: General Discussion
Topic: Converted alternator on ebike controller
Replies: 39
Views: 2333

Re: Converted alternator on ebike controller

The magnets in the alternator looked more trouble than they where worth when I looked into it, getting them between each pole on the rotor seems pretty common on those "energy assist" alternator/motor things some cars have, tricky to machine though, an engineering company might charge more than the ...
by stan.distortion
Nov 10 2019 7:25am
Forum: Battery Technology
Topic: Could someone be able to diagnose this problem?
Replies: 4
Views: 265

Re: Could someone be able to diagnose this problem?

... no bms on it i removed the casing for my ebike. another chinese no namer but i thought i could use it http://en.chilwee.com:8000/upload/BN7220LE.pdf At a guess it's burned out a tab on one of the pouches. Very unlikely it's repairable but it's probably only a single pouch, should be possible to...
by stan.distortion
Nov 10 2019 6:40am
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 832
Views: 48331

Re: APL's DIY axial-flux motor

That modular setup looks good, can you see how they're fixed in place? Can't make it out from the pics, guessing it's just a screw hole or clip moulded into the coil holder but it'd be interesting to see how strong they've made it as it doesn't look like much strength is needed. I wouldn't have thou...
by stan.distortion
Nov 10 2019 5:51am
Forum: Battery Technology
Topic: Could someone be able to diagnose this problem?
Replies: 4
Views: 265

Re: Could someone be able to diagnose this problem?

Firstly, do the batteries have a BMS? The BMS tripping from too much current is the most likely cause imo. What's the A/Hr and C rating and how many cells do you have in parallel? If they're all in series then you could be drawing way more current than they can handle, ideally you want to spec your ...
by stan.distortion
Nov 08 2019 11:28am
Forum: Battery Technology
Topic: Super Capacitors for "Burst Mode"?
Replies: 27
Views: 876

Re: Super Capacitors for "Burst Mode"?

Kind of makes sense for regen, most lithium batteries have a much higher discharge rate than charge rate but there are exceptions, there are extremely durable (10k cycle or more) batteries on the market now with very high values for both charge and discharge. Power density isn't great but they're id...
by stan.distortion
Nov 07 2019 7:01am
Forum: General Discussion
Topic: Converted alternator on ebike controller
Replies: 39
Views: 2333

Re: Converted alternator on ebike controller

Had you tried wiring for 24v? I'd played around with powering alternators a bit and for some reason the (cheap 6s RC) controller I was using was happy at 12v but would stutter with any kind of load at 24v. I never dug into why but it suggested a rewind would be needed for high voltages so got put on...
by stan.distortion
Nov 06 2019 8:08am
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 832
Views: 48331

Re: APL's DIY axial-flux motor

I've designed a 3700 Nm , 36cm diameter and 30 kg weight motor in my computer but who knows if a real prototype would work, I always read that FEM simulations reach 95% accuracy but it's all circumstantial. Albeit IMO a diy motor is for fun and you shouldn't bother with high efficiency or power den...
by stan.distortion
Nov 04 2019 5:36pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 832
Views: 48331

Re: APL's DIY axial-flux motor

If you're getting a printer the lowest price units on ebay are very hard to beat imho, usually around $100. It's easy enough to splash out on something higher priced later when you've a better idea what you need (multihead, bigger bed etc.). Some print jobs can take an entire day so a second unit wo...
by stan.distortion
Nov 03 2019 8:36am
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 832
Views: 48331

Re: APL's DIY axial-flux motor

Efficiency is a compromise. It's impossible to design a motor with high efficiency over its entire operating range, instead operating conditions must be adjusted to make the most of the motors characteristics and that's done with the control system. A well designed hub motor can be over 90% efficien...
by stan.distortion
Nov 01 2019 6:01am
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 832
Views: 48331

Re: APL's DIY axial-flux motor

Ok now i see why you're looking into external fan cooling :) Trial is a very specific use case but actually a very good match for an electric swap (loads of low torque needed). You're talking about aluminium conductor on a coreless build ? That's really interesting ! Have you found a way to limit E...
by stan.distortion
Oct 31 2019 9:11am
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 832
Views: 48331

Re: APL's DIY axial-flux motor

That's true. I've been aiming at minimum weight, coreless and enough space to use aluminium instead of copper for the windings so there's been almost nothing to absorb excess heat. Scaling up for use in a trials bike is also one of my main goals so cooling has been a big concern, lots of low speed h...