Search found 1848 matches

by larsb
Aug 06 2020 6:57am
Forum: Items for Sale - New
Topic: QSMOTOR,0.5-12kW Electric Hub Motor & Mid Drive Motor Manufacture China
Replies: 1367
Views: 275323

Re: QSMOTOR,0.5-12kW Electric Hub Motor & Mid Drive Motor Manufacture China

That three wheeler and that motor with those small wheels - it will be crazy to the point of not being driveable :wink:
by larsb
Aug 04 2020 8:26am
Forum: General Discussion
Topic: Higher temperature hall-effect sensors
Replies: 7
Views: 230

Re: Higher temperature hall-effect sensors

Although it might seem like an easy fix at this point your hall sensors are telling you that you need to change your system. Just get a bigger motor or a smaller rear wheel or a geared setup and use it for years without hickups. Motors shouldn’t be hall sensor cooking hot in everyday use 8)
by larsb
Aug 03 2020 8:43am
Forum: E-Bike Non-hub Motor Drives
Topic: qs 1000w builds
Replies: 54
Views: 4144

Re: qs 1000w builds

That's possibly not an issue if you cut the original sprocket down enough in diameter. I doubt it will fit on the inside though, isn't it pretty tight already?
by larsb
Aug 03 2020 8:08am
Forum: E-Bike Non-hub Motor Drives
Topic: qs 1000w builds
Replies: 54
Views: 4144

Re: qs 1000w builds

just buy a hubless sprocket and make the hole oversize, they are called platewheels or sprocket "type A".
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by larsb
Aug 03 2020 7:51am
Forum: E-Bike Non-hub Motor Drives
Topic: qs 1000w builds
Replies: 54
Views: 4144

Re: qs 1000w builds

It’s a bad idea for long term. Bolt the sprocket you want to the outside of the sprocket that fits, if needed cut it down with an angle grinder. 1 hour job at the most :D
by larsb
Aug 03 2020 5:34am
Forum: Electric Watercraft
Topic: ”The barge” efoil build
Replies: 64
Views: 2293

Re: ”The barge” efoil build

Made a cradle for the controller with some angle brackets, to keep it in place during riding and maintain heat exchange to the outside of the box.
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by larsb
Aug 03 2020 2:08am
Forum: E-Bike General Discussion
Topic: Show Us Your Homemade Battery Housing
Replies: 577
Views: 175233

Re: Show Us Your Homemade Battery Housing

Ultra clean build there :thumb:
by larsb
Aug 01 2020 1:52pm
Forum: Electric Watercraft
Topic: ”The barge” efoil build
Replies: 64
Views: 2293

Re: ”The barge” efoil build

Block will be connected to the outside water through an alu plate so the heat has somehere to go, if that doesn’t work i’ll get active water cooling. I like simple systems so it will have to evolve only as needed :wink: 5FE6D682-6153-4A97-B2A4-574B4ADB8061.jpeg And.. I’ll post videos when i’m at pro...
by larsb
Aug 01 2020 12:57pm
Forum: Electric Watercraft
Topic: ”The barge” efoil build
Replies: 64
Views: 2293

Re: ”The barge” efoil build

Improving the heat management of the controller: mounting a 400g alu block with heat paste between the two. Simple, crude but effective for a while :D
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by larsb
Jul 30 2020 1:11pm
Forum: Electric Watercraft
Topic: ”The barge” efoil build
Replies: 64
Views: 2293

Re: ”The barge” efoil build

I don’t think it’s really so hard that it’s needed, i just need some practise :D I think the key is to have the board planing and just do small lifts/flights at first, then the water just catches you without a crash instead of smacks you and you get a lot more done :D Btw, i saw a video where the su...
by larsb
Jul 30 2020 7:10am
Forum: Motor Technology
Topic: Is BLDC motor field weakening bad for the magnets?
Replies: 3
Views: 739

Re: Is BLDC motor field weakening bad for the magnets?

Is this bad for the permanent magnets? Should I be judicious with the flux weakening settings on my controller? The field weakening leads to lower efficiency/higher temperature in most ebike motors and can demagnetize neodym during these conditions. Yes, you should be careful with field weakening s...
by larsb
Jul 29 2020 1:31am
Forum: Electric Watercraft
Topic: ”The barge” efoil build
Replies: 64
Views: 2293

Re: ”The barge” efoil build

Some things will be updated on the efoil when i’m back home: -Arming switch to be moved to where it doesn’t get knocked off - Heat exchanger plate for controller in side of enclosure - Small wall (hot glue) on bottom of enclosure for stopping battery from shifting during splash Motor updates - filli...
by larsb
Jul 27 2020 2:23pm
Forum: Electric Watercraft
Topic: ”The barge” efoil build
Replies: 64
Views: 2293

Re: ”The barge” efoil build

Checked efoil weight: 31.5 kg (ready to go with everything on it)

The gong wing, fuselage and stab alone is 3.5 kg, a lot could be saved by going to a different foil.
by larsb
Jul 27 2020 1:52pm
Forum: Electric Watercraft
Topic: ”The barge” efoil build
Replies: 64
Views: 2293

Re: ”The barge” efoil build

I’ll weigh it, good idea! I can already find some optimization points, cutting some kilos won’t be difficult. It’s a bit overbuilt now. I think the foil could be placed more rearwards and board be shorted from 180cm to 150 or so. It should be a bit more rounded off course, now the wind gets it. I’d ...
by larsb
Jul 26 2020 1:46pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: Rieju 50cc conversion
Replies: 233
Views: 27764

Re: Rieju 50cc conversion

Back on track! My Efoil is now built and finished and the 32S BMS just arrived at my door. I won't be home until next week so it's still some days until progress on the moped.
by larsb
Jul 26 2020 1:32pm
Forum: Electric Watercraft
Topic: ”The barge” efoil build
Replies: 64
Views: 2293

Re: ”The barge” efoil build

It's time to summarize this build :D Costs: wing assy 400 eur epoxy 100 eur glassfibre 50 eur XPS 30 eur 3d print thread 30 eur cables 15 eur throttle 20 eur resistance wire 10 eur dimmer 25 eur PSU 75 eur Plywood 20 eur enclosure 80 eur connectors 10 eur battery module 150 eur 80100 motor 150 eur c...
by larsb
Jul 26 2020 3:00am
Forum: Items for Sale - New
Topic: QSMOTOR,0.5-12kW Electric Hub Motor & Mid Drive Motor Manufacture China
Replies: 1367
Views: 275323

Re: QS MOTOR,0.5-14kW Electric Hub Motor Manufacture China

Thank you for your interest, the 180 90H motor is ready, we are testing it with VOTOL and APT controller. It seems VOTOL EM300 is not good, we are building e-tricyle to mount 180 mid drive motor with APT 72600 controller. It's in test process... What are the specifications for the APT 72600? Phase ...
by larsb
Jul 25 2020 9:33am
Forum: Electric Watercraft
Topic: ”The barge” efoil build
Replies: 64
Views: 2293

Re: ”The barge” efoil build

first flight today :D :D :D
Once up on the wing it's a lot harder to balance and it speeds up quite a bit :D

I smacked into the water like 50 times so i feel quite beat up but still extremely happy with this build, three weeks to build a functioning efoil from scratch is not bad :thumb:
by larsb
Jul 25 2020 3:20am
Forum: Electric Watercraft
Topic: ”The barge” efoil build
Replies: 64
Views: 2293

Re: ”The barge” efoil build

ugh, i was using what was on the controller when i got it :wink:
don't ask what it was but i can say it was a bit underspeced (i'm SFOCing) :D

i've soldered on fresh 8awg wires and xt150s now
by larsb
Jul 24 2020 4:52pm
Forum: Motor Technology
Topic: Neumotor 8057/75 middrive project, belt drive, adding halls, 10kW+
Replies: 173
Views: 34694

Re: Neumotor 8057/75 middrive project, belt drive, adding halls, 10kW+

one could 3d-print a cover for it, would look nice if done well :thumb:
by larsb
Jul 24 2020 3:43pm
Forum: Motor Technology
Topic: Neumotor 8057/75 middrive project, belt drive, adding halls, 10kW+
Replies: 173
Views: 34694

Re: Neumotor 8057/75 middrive project, belt drive, adding halls, 10kW+

that's a lot better looking up close, still easy to crack with only a slight bump. did they charge extra for the hall option?
by larsb
Jul 24 2020 10:32am
Forum: Electric Watercraft
Topic: ”The barge” efoil build
Replies: 64
Views: 2293

Re: ”The barge” efoil build

Got standing today, it doesn't lift yet but it was very close. I'll try some different props and higher current :D

The connectors melted in the box so there's some heat to take care of already now :wink:
by larsb
Jul 23 2020 2:22pm
Forum: Electric Watercraft
Topic: ”The barge” efoil build
Replies: 64
Views: 2293

Re: ”The barge” efoil build

I set some new parameters on the controller, it runs so much better now that i am really looking forward to tomorrows trials :D
by larsb
Jul 23 2020 10:12am
Forum: Battery Technology
Topic: mega copper battery spotwelder
Replies: 21
Views: 1834

Re: mega copper battery spotwelder

This'll be interesting 8)
sub'ed
by larsb
Jul 23 2020 6:13am
Forum: Electric Watercraft
Topic: ”The barge” efoil build
Replies: 64
Views: 2293

Re: ”The barge” efoil build

first runs done, total success! :D :D :D The board barely floats with me but it was no problem to stay on it or get on my knees. Enclosure stayed completely dry. There was a bit of power lacking from the drive to reach flying, i need to set the controller parameters better. I'll do some readouts, ch...