Search found 14433 matches

by fechter
Jun 01 2020 9:09am
Forum: Motor Technology
Topic: 5v on all hall sensor wires
Replies: 8
Views: 113

Re: 5v on all hall sensor wires

A typical motor hall sensor is a SS41. These are available from many sources such as Mouser or DigiKey (in the US). Each hall sensor has +5v and ground for power. The little hall circuit board sends the 5v and ground to each sensor. The signal output will be near zero or near 5v depending on the mag...
by fechter
May 31 2020 8:06pm
Forum: Motor Technology
Topic: 5v on all hall sensor wires
Replies: 8
Views: 113

Re: 5v on all hall sensor wires

It sounds like possibly the ground wire is broken somewhere. 4.3v is pretty common.
Try to trace the cable and double check any connections.
by fechter
May 31 2020 11:37am
Forum: General Discussion
Topic: la Nina rears her ugly head
Replies: 1746
Views: 126458

Re: la Nina rears her ugly head

Actually had some lightning and thunder yesterday. Woke me up at around 4:00am. By the time I got out of bed, the ground was dry and there was nothing in the rain gauge. Glad the lightning didn't start any fires.
by fechter
May 30 2020 9:30pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 1077
Views: 97252

Re: APL's DIY axial-flux motor

For measuring kV, it will be the number of turns regardless of length. The air gap will make a difference. The closer the gap, the more voltage you'll generate, but for typical motor gap sizes, I don't think it will make a huge difference. You will need both rotors to get a good measurement. The ide...
by fechter
May 30 2020 12:11pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 1077
Views: 97252

Re: APL's DIY axial-flux motor

For just testing the kV, you could use any wire. Something skinny and easy to wind.
by fechter
May 26 2020 2:27pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 1077
Views: 97252

Re: APL's DIY axial-flux motor

The no-load rpm will be nearly inversely proportional to the number of turns. Most motors run peak efficiency at around 90% of the no-load speed. You might want to consider even more turns.
by fechter
May 26 2020 9:57am
Forum: General Discussion
Topic: la Nina rears her ugly head
Replies: 1746
Views: 126458

Re: la Nina rears her ugly head

-Only- 98F here. I took the Sur-ron out for a ride along the SF bay shoreline and it was a little cooler there but still pretty warm.
by fechter
May 26 2020 12:09am
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 1077
Views: 97252

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: 400
Views: 23888

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: 400
Views: 23888

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: 1077
Views: 97252

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: 1810

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: 54762

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: 54762

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: 1077
Views: 97252

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: 4935
Views: 505743

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: 31163

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: 1746
Views: 126458

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: 4935
Views: 505743

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: 31163

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: 31163

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: 17936

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: 1746
Views: 126458

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: 17936

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: 400
Views: 23888

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...