Search found 250 matches

by stan.distortion
Jul 24 2021 3:35pm
Forum: General Discussion
Topic: how about a 3d printer section?
Replies: 30
Views: 356

Re: how about a 3d printer section?

Could be tempratures, would certainly benefit from a little lower on the nozzle imo but at a guess you'll see a big improvement if you put on a new nozzle. There's no black and white figure for nozzle wear, some folks change the cheap brass ones more regularly than they change rolls of filament, oth...
by stan.distortion
Jul 23 2021 10:29am
Forum: Battery Technology
Topic: Single cell voltage isolated chargers?
Replies: 3
Views: 85

Re: Single cell voltage isolated chargers?

Thanks. Never come across it before and thought I might have been missing something, good to know it's viable :) The wall wort one could be really good, wouldn't imagine it's hard to find them at the right voltage for next to nothing. Was wondering about it after seeing the prices on high current ch...
by stan.distortion
Jul 23 2021 6:00am
Forum: Battery Technology
Topic: Single cell voltage isolated chargers?
Replies: 3
Views: 85

Single cell voltage isolated chargers?

Does such a thing exist? It would seem to make some sense to use a single charger for each parallel group rather than one big charger for the whole pack, costs don't seem much different, the inputs could be wired in series (or parallel groups in series) to get input/output voltages as close as possi...
by stan.distortion
Jul 22 2021 4:18am
Forum: Items for Sale - New
Topic: QSMOTOR,0.5-12kW Electric Hub Motor & Mid Drive Motor Manufacture China
Replies: 1431
Views: 316798

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

Sweet! :bigthumb: EDIT: Great news on the European warehouse too, shipping and duty charges are the painful part of otherwise great price and performance! Any updates on controllers? The EM150s and lower seem like the only viable options at the mo, great price and performance but the lack of informa...
by stan.distortion
Jul 21 2021 3:41am
Forum: General Discussion
Topic: how about a 3d printer section?
Replies: 30
Views: 356

Re: how about a 3d printer section?

Thanks for the info. I am a total newbie at 3D printing, so everything is useful info to me. I was wondering if I should even mess with ABS.I have a spool of nylon on the way to try, but was wondering if the carbon fiber infused stuff is worth messing with. I will mostly be using the printer for br...
by stan.distortion
Jul 17 2021 5:49am
Forum: EScooter/EMotorcycle Build Threads
Topic: Yamaha YZF250F
Replies: 168
Views: 10365

Re: Yamaha YZF250F

Hmm... that seems to be the best solution (making sprockets yourself resp. have them custom made). After my first spinning tests, I am afraid that neither my sprockets from QS nor those bought from AliExpress are really useable... But my measures are different from yours. Does QS put different driv...
by stan.distortion
Jul 17 2021 3:53am
Forum: General Discussion
Topic: how about a 3d printer section?
Replies: 30
Views: 356

Re: how about a 3d printer section?

Also for anybody printing mechanical parts a heated chamber is the number one upgrade by far. All my FDM printers run heated chambers, normally around 70C and it makes printing strong parts from warpy materials easy. I'm curious how you keep your enclosure at 70C. Is it as simple as keeping an 60W ...
by stan.distortion
Jul 17 2021 2:54am
Forum: Motor Technology
Topic: DIY Toroidal Axial Flux PM
Replies: 161
Views: 5736

Re: DIY Toroidal Axial Flux PM

Sorry, I meant speed up hand-finishing the parts to get them parallel, not increase rpm. Any thoughts on balancing? Getting up to 4k rpm without balancing is impressive, it will be interesting to see how well it can hold together at higher revs. I've had a 100mm drum fan close to 10k rpm, over 100 h...
by stan.distortion
Jul 14 2021 5:42am
Forum: EScooter/EMotorcycle Build Threads
Topic: Conversion of a Bultaco Sherpa
Replies: 93
Views: 4377

Re: Conversion of a Bultaco Sherpa

It feels like they're the winding's, just continued out as the cable rather than joined to a regular cable before leaving the motor. In the em100/150 thread there are some pictures from an unfortunate scooter fire with the same motor, fairly sure the bare cables are clearly visible in them (somewher...
by stan.distortion
Jul 12 2021 4:44am
Forum: Motor Technology
Topic: DIY Toroidal Axial Flux PM
Replies: 161
Views: 5736

Re: DIY Toroidal Axial Flux PM

Gearing losses are very high with printed gears too, a 3d printed hob to get them more accurate should be a doable and oil immersion would help with wear but it's a very long-winded approach. Cycloidal is an absolute no-go imo, you're basically running full sized high torque output gears at full spe...
by stan.distortion
Jul 12 2021 4:15am
Forum: Battery Technology
Topic: LIFEPO4 and Lithium ion in parallel ?????????
Replies: 7
Views: 211

Re: LIFEPO4 and Lithium ion in parallel ?????????

I'd asked a similar question recently, along with suggesting various elaborate schemes in a attempt to match the characteristics of the different chemistries and keep within the limitations of each and the answers boil down to "hook them up together and try it". However! That was with new ...
by stan.distortion
Jul 11 2021 4:24am
Forum: Motor Technology
Topic: DIY Toroidal Axial Flux PM
Replies: 161
Views: 5736

Re: DIY Toroidal Axial Flux PM

Impressive! Congrats :)
by stan.distortion
Jul 10 2021 12:40am
Forum: EScooters/EMotorcycles
Topic: Early advice for a new build
Replies: 9
Views: 365

Re: Early advice for a new build

Thanks again for the information. Funnily enough while I thought I'd be just browsing and speccing parts for a long while I've just came across a 1999 Aprilia RS125 with a bad engine going for practically nothing so I am very tempted to go have a look. Looking on the forum there seems to have been ...
by stan.distortion
Jul 09 2021 1:25pm
Forum: EScooters/EMotorcycles
Topic: Early advice for a new build
Replies: 9
Views: 365

Re: Early advice for a new build

Something maybe worth considering are older aircooled twinshock bikes. It's way easier to make a fully faired bike look right but twinshock means there's extra space that's usually taken up by a monoshock, swinging arms are often shorter which can add up to a bit more space and air cooled engines us...
by stan.distortion
Jul 08 2021 8:41am
Forum: EScooters/EMotorcycles
Topic: Early advice for a new build
Replies: 9
Views: 365

Re: Early advice for a new build

Just a couple of points, the 3kw unit mentioned will fit your needs just fine, I'm using one on a much heavier bike and 60mph with 50mph on steep hills is no problem at all. A hub motor may work out better for you and for the mid, I'd inquire with QS on when they'll have the 4kw available with a red...
by stan.distortion
Jul 08 2021 8:23am
Forum: Battery Technology
Topic: Charging a 72v pack from a 96v pack?
Replies: 22
Views: 554

Re: Charging a 72v pack from a 96v pack?

Once EVs are as readily available as FF I think we'll see countries steadily hike up fuel taxes to unaffordable levels, maybe with exemptions in places where FF is the only viable option unless battery tech takes a big jump in capacity. LFP and LTO is possibly one area where Tesla can stay relevant,...
by stan.distortion
Jul 08 2021 7:49am
Forum: EV Business World
Topic: real car companies are finally coming for Tesla
Replies: 28
Views: 625

Re: real car companies are finally coming for Tesla

Tesla never stood a chance, major manufacturers where quite happy to sit back and do their R&D while Tesla carved out a new market for them and now that market is on the brink of booming they'll wipe the floor with Tesla. They where never a serious threat, there was no way they could even come c...
by stan.distortion
Jul 08 2021 5:26am
Forum: EScooter/EMotorcycle Build Threads
Topic: Conversion of a Bultaco Sherpa
Replies: 93
Views: 4377

Re: Conversion of a Bultaco Sherpa

You have to push those motors very hard before they get more than warn to the touch so I'd say battery but it should be easy enough to add a 2 position switch and have both.
by stan.distortion
Jul 07 2021 11:43am
Forum: Battery Technology
Topic: Using a high rating charger
Replies: 12
Views: 331

Re: Using a high rating charger

You could drop the voltage using diodes, but they will get really hot and need a huge heat sink. For just a few amps, it's not too bad. Unless your charger is fully potted, you should be able to adjust the voltage. Many times there is a trimmer pot on the board that allows some range of adjustment....
by stan.distortion
Jul 07 2021 4:09am
Forum: Battery Technology
Topic: Using a high rating charger
Replies: 12
Views: 331

Re: Using a high rating charger

Would it be ok to bring the voltage down with diodes in a case like this? I'm kind of in the same situation with a 10a 84v charger and an 18s2p lipo pack( 6x 5ah 6s packs), using a hobby balance charger to charge each pack individually at the mo but it's a full day job and I have a dozen 30a bridge ...
by stan.distortion
Jul 06 2021 10:32am
Forum: Battery Technology
Topic: Charging a 72v pack from a 96v pack?
Replies: 22
Views: 554

Re: Charging a 72v pack from a 96v pack?

... There's nothing even remotely close. The 21700s are 230Wh/kg; automotive LFP stalled with the AMP20M1HD-A at 130Wh/kg. This is a pretty common design requirement, and the standard solution is to spec the auxiliary pack(s) to the same nominal voltage as the primary pack and then just parallel th...
by stan.distortion
Jul 05 2021 10:19am
Forum: Battery Technology
Topic: Balancing question
Replies: 7
Views: 327

Re: Balancing question

Do you have a pic showing how they're connected? Somewhere there's a really good thread on battery building, well worth a read as there are lots of potential pitfalls that aren't really obvious until explained and many can be easily avoided. At a guess, you're pulling power from one end of a paralle...
by stan.distortion
Jul 05 2021 6:46am
Forum: Battery Technology
Topic: Charging a 72v pack from a 96v pack?
Replies: 22
Views: 554

Re: Charging a 72v pack from a 96v pack?

So what are the energy inputs? Be very wary of the non-LFP packs if you are talking a mobile living space for humans. Why not just use LFP throughout? If you do mix chemistries, and you say any voltage, then simplest is build them the same charging voltage and charge them both the same time from th...
by stan.distortion
Jul 05 2021 6:11am
Forum: Battery Technology
Topic: Charging a 72v pack from a 96v pack?
Replies: 22
Views: 554

Re: Charging a 72v pack from a 96v pack?

I had a plan to do a similar thing, but from 12s modules to my 22s battery. I dont know if there is something of interest for you in that thread: https://endless-sphere.com/forums/viewtopic.php?f=14&t=109850 I havent tried it, there are very few times that I actually need more battery. Thanks, ...
by stan.distortion
Jul 05 2021 5:42am
Forum: Battery Technology
Topic: Charging a 72v pack from a 96v pack?
Replies: 22
Views: 554

Re: Charging a 72v pack from a 96v pack?

... Give details as to your use case Thanks. All mobile, about 3kw/hr of lifepo4 pretty much built-in that covers 90% of use cases and power needs with plenty of headroom and then anything up to about 20kw/hr of li-ion that's easily removable and only attached when extra range is needed. Voltages f...