Search found 14428 matches

by fechter
May 26 2020 12:09am
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 1063
Views: 96351

Re: APL's DIY axial-flux motor

That should work.

Are the coils going to be a single layer?
by fechter
May 25 2020 9:48am
Forum: E-Vehicles General Discussion
Topic: C Cab Hot Rod Power Advice
Replies: 398
Views: 23685

Re: C Cab Hot Rod Power Advice

Interesting... It says:
The family firm's Invercargill branch, founded by Hayes' son Irving Hayes in 1934, still exists as a hardware store; memorabilia from Southland inventor and motorcyclist Burt Munro (depicted in The World's Fastest Indian) is displayed in the store's museum.
by fechter
May 24 2020 9:34pm
Forum: E-Vehicles General Discussion
Topic: C Cab Hot Rod Power Advice
Replies: 398
Views: 23685

Re: C Cab Hot Rod Power Advice

Those are some pretty interesting rims there. Never seen anything like that. Do you use a single inner tube? Yeah, not much clearance for the caliper. I guess you'll find out when they arrive. If the disks were a little bigger than the inner spoke flange, it would give you a lot more clearance. I've...
by fechter
May 24 2020 10:51am
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 1063
Views: 96351

Re: APL's DIY axial-flux motor

I like the kapton tape , and the epoxy ideas, I'll give them a try. :thumb: I could maybe try a piece of polypropylene bag as a barrier as well, and use it to pull the coil off when done. I don't think it will stick to anything. Plastic bags work well too. Epoxy won't stick to it. You just need the...
by fechter
May 23 2020 10:42am
Forum: General Discussion
Topic: Developing eLegs / exoskeleton for sports, an OpenSource project
Replies: 11
Views: 1762

Re: Developing eLegs / exoskeleton for sports, an OpenSource project

That's pretty cool.

Just from my bike riding experience, a shark sized battery pack can output several times more power than my (weak) leg muscles for over an hour. More than 10x for shorter bursts.
by fechter
May 23 2020 12:16am
Forum: Battery Technology
Topic: Common pack design mistakes, how to avoid?
Replies: 318
Views: 54549

Re: Common pack design mistakes, how to avoid?

Good point about the spacers. I used Nomex paper and fiberglass tape which won't melt or abrade too easily. My cells get pretty warm during discharge but one face of each brick is against the container wall so heat has a place to go.
by fechter
May 22 2020 12:36pm
Forum: Battery Technology
Topic: Common pack design mistakes, how to avoid?
Replies: 318
Views: 54549

Re: Common pack design mistakes, how to avoid?

Please correct me if im wrong, but in the case of a building a high capacity high discharge battery pack. Would this be the best way to build the pack to be able to handle the high current, deliver the high current, and keep the battery pack 'cool'. I used a similar approach and it has worked very ...
by fechter
May 22 2020 12:30pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 1063
Views: 96351

Re: APL's DIY axial-flux motor

Another approach might be to use a tapered form made of polyethylene or polypropylene that won't stick to epoxy, then wind the coil with some epoxy, let it cure, and slide it off the form. Silicone grease on the form will help keep it from sticking. Once the coil is cured, it will be like a solid pi...
by fechter
May 22 2020 12:18pm
Forum: E-Bike Non-hub Motor Drives
Topic: Sur-Ron - New Mid drive Bike
Replies: 4930
Views: 503724

Re: Sur-Ron - New Mid drive Bike

srapy wrote:
May 22 2020 10:50am

After changing to 16S, doing lots of experiments, upgrading to FW 5.0 I reached 15,4KW peak at 440 Phaseamps.
Heres an unspectacular video of the bike and a picture of it.
Nice. How is it on pavement? You get more traction.
by fechter
May 20 2020 1:50pm
Forum: E-Bike Non-hub Motor Drives
Topic: DIY Fix for BBS02/BBSHD Pedal/Throttle Issue
Replies: 136
Views: 30942

Re: DIY Fix for BBS02/BBSHD Pedal/Throttle Issue

Yes, that's the way it's going to work. If you slowly advance the throttle when it's motoring in PAS, there will be a dead spot until you bring the throttle up enough to make the motor spin. The real fix would be a firmware change but that's not an option at this point.
by fechter
May 19 2020 11:00am
Forum: General Discussion
Topic: la Nina rears her ugly head
Replies: 1744
Views: 126208

Re: la Nina rears her ugly head

Got another 0.3" here. Very unusual for this time of year, but it has cleared out now and looks like the rainy season will be over. I'll be interested to see if the grass turns green again. It all turned brown since the rains earlier in the season.
by fechter
May 19 2020 10:57am
Forum: E-Bike Non-hub Motor Drives
Topic: Sur-Ron - New Mid drive Bike
Replies: 4930
Views: 503724

Re: Sur-Ron - New Mid drive Bike

X-Nitro wrote:
May 19 2020 12:25am
Orlov got his hands on a nice looking e-moto a few weeks ago..
https://www.youtube.com/watch?v=_mhMqbLZ8zM
That looks like a pretty nice bike. I love the part at the end of the video where he goes to the gas station. :mrgreen:
by fechter
May 19 2020 10:48am
Forum: E-Bike Non-hub Motor Drives
Topic: DIY Fix for BBS02/BBSHD Pedal/Throttle Issue
Replies: 136
Views: 30942

Re: DIY Fix for BBS02/BBSHD Pedal/Throttle Issue

Keep in mind that if you slowly advance the throttle, at some point the transistor kicks in and disables PAS. Right at this point, the throttle setting may be lower than what is needed to make the motor spin, so power will drop out until you advance the throttle a little more. You could try raising ...
by fechter
May 18 2020 10:21pm
Forum: E-Bike Non-hub Motor Drives
Topic: DIY Fix for BBS02/BBSHD Pedal/Throttle Issue
Replies: 136
Views: 30942

Re: DIY Fix for BBS02/BBSHD Pedal/Throttle Issue

Can anybody tell me if I change the resistor to a lower value like 50K will my throttle take control before the PAS and give me smooth throttle control at low speed? Changing the resistor won't change the point where the throttle takes over by much. Changing the throttle low setting in the programm...
by fechter
May 14 2020 9:44am
Forum: Items for Sale - New
Topic: Sur-Ron - Belt upgrade KIT
Replies: 121
Views: 17784

Re: Sur-Ron - Belt upgrade KIT

If the belt comes off to the outside where the riders right leg is, well that can get dangerous. If the belt comes off either side it can get dangerous. Once the belt comes off, it will immediately stop moving. That said, as long as the sprockets are properly aligned and the axle doesn't come loose...
by fechter
May 13 2020 9:52pm
Forum: General Discussion
Topic: la Nina rears her ugly head
Replies: 1744
Views: 126208

Re: la Nina rears her ugly head

Picked up about 0.3" since yesterday. A few more waves are in the forecast. It's just enough to give the soil enough moisture so it's not dusty. Perfect riding conditions. :thumb:
by fechter
May 13 2020 8:58am
Forum: Items for Sale - New
Topic: Sur-Ron - Belt upgrade KIT
Replies: 121
Views: 17784

Re: Sur-Ron - Belt upgrade KIT

I'd recommend installing the rear sprocket so the flange is on the inside. This way if the belt decides to come off, at least it won't get caught on the spokes. It also makes it easier to inspect the teeth and makes it easier to take off the rear wheel.
by fechter
May 12 2020 9:22am
Forum: E-Vehicles General Discussion
Topic: C Cab Hot Rod Power Advice
Replies: 398
Views: 23685

Re: C Cab Hot Rod Power Advice

I've been noticing that burned-out feeling a lot lately and my projects are far less ambitious. I think it has to do with being locked down from the virus for so long. But I do feel better whenever I complete something. Once your brakes show up, you'll be on the verge of that first test drive. Looki...
by fechter
May 10 2020 10:32am
Forum: Alternative Energy
Topic: Inverter recommendations? 48V sine wave, no grid tie
Replies: 20
Views: 2404

Re: Inverter recommendations? 48V sine wave, no grid tie

With a resistive heater, the resistance is pretty low when it's cold so there will be an initial high current needed to get it glowing.

I got this one last year:
Img_1395.jpg
Img_1395.jpg (73.02 KiB) Viewed 209 times
It's able to run my 1750w microwave oven or a 1500w electric heater. So far it has worked well.
Img_1393.jpg
Img_1393.jpg (83.73 KiB) Viewed 209 times
by fechter
May 10 2020 10:22am
Forum: Battery Technology
Topic: BMS modding for more current
Replies: 32
Views: 5386

Re: BMS modding for more current

Hey there Electricgod, I see you haven't been online for a little while, I hope you are well. I have a BMS that failed; two of the mosfets cracked and are missing chunks. I was reading this thread in hopes to repair and mod my BMS but unfortunately all of the pictures are broken and as they say a p...
by fechter
May 10 2020 12:03am
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 1063
Views: 96351

Re: APL's DIY axial-flux motor

It probably won't make a really noticeable difference. Having more mechanical strength has a lot of advantages too. Motor design is all a bunch of trade-offs.
by fechter
May 09 2020 11:08am
Forum: E-Bike Technical
Topic: Thumb throttle won't stop when released
Replies: 7
Views: 288

Re: Thumb throttle won't stop when released

I'd be inclined to try re-flashing the software if you can figure out what the right version is. Possibly something in the file got corrupted. I've never seen a cruise control feature on the BBSxx.
by fechter
May 09 2020 11:03am
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 1063
Views: 96351

Re: APL's DIY axial-flux motor

Those are beautiful.

I forget, why did you not use a brim on the end turn area? From what I read before, that's a way to reduce copper losses and weight.
by fechter
May 07 2020 11:26am
Forum: E-Bike Technical
Topic: Thumb throttle won't stop when released
Replies: 7
Views: 288

Re: Thumb throttle won't stop when released

That's pretty bizarre. Never heard of that symptom before with a BBS02.
When you stop it with the brake lever switch, does it start going again when you release the brake?
by fechter
May 03 2020 10:18am
Forum: E-Bike General Discussion
Topic: Repairing a shunt on a mainboard
Replies: 44
Views: 931

Re: Repairing a shunt on a mainboard

Can those little jumper resistor blow? Probably not. It's just a piece of wire inside a resistor package. The next one in line going to the main chip could blow and would be worth checking. If a FET blew, you'd have other problems and they are generally obvious. This is pretty easy to check by disc...