Search found 168 matches

by sketchism
Aug 24 2016 5:53am
Forum: E-Bike Technical
Topic: Definitive Tests on the Heating and Cooling of Hub Motors
Replies: 2101
Views: 396503

Re: Definitive Tests on the Heating and Cooling of Hub Motor

how much will a layer of black paint take away from the cooling effectiveness any beta tester gonna try and paint theirs? Flat black/matt black would actually better the heat shedding capacity. Search this thread and see why. yeppers final ones are anodised black for improved emissivity without add...
by sketchism
Aug 23 2016 11:52pm
Forum: Items for Sale - New
Topic: Vector e-bike and Parts / WORLDWIDE
Replies: 2366
Views: 376076

Re: Vector e-bike Frame 599$ /Adaptto/Parts WORLDWIDE

To Sketchism: A data point that would be interesting is to see the difference between using just ferofluid, and using both ferofluid and the heat sink. We've done prelim bench testing on the FLIR with multiple configurations using the prototypes and will replicate with the finished versions A) Hub ...
by sketchism
Aug 23 2016 11:35pm
Forum: E-Bike Technical
Topic: Definitive Tests on the Heating and Cooling of Hub Motors
Replies: 2101
Views: 396503

Re: Definitive Tests on the Heating and Cooling of Hub Motor

Under $40 i would say, it cost me more than this to buy cheap computer heatsinks and epoxy to do the DIY prototypes, my goal is to make these the cheapest and most effective way to do it and just get my development costs back over time. Good question, today I just received word that the complete hea...
by sketchism
Aug 23 2016 10:56pm
Forum: E-Bike Technical
Topic: Definitive Tests on the Heating and Cooling of Hub Motors
Replies: 2101
Views: 396503

Re: Definitive Tests on the Heating and Cooling of Hub Motor

quick little update for those following along! We are still in Beta testing and production but guys like Liveforphysics and Spinningmagnets and a few other well known names in the community have generously agreed to be involved in independent testing, so before i make them publicly available i wante...
by sketchism
Aug 23 2016 10:18pm
Forum: Items for Sale - New
Topic: Vector e-bike and Parts / WORLDWIDE
Replies: 2366
Views: 376076

Re: Vector e-bike Frame 599$ /Adaptto/Parts WORLDWIDE

Sorry dude, I don't want to sound evil or something, but where is the big investment then just to put some head shrinks on that hubi? Maybe my English is not good enough to understand everything he was talking about in his video. Once again, this is just a nice question, no hate. ~Regards Just to w...
by sketchism
Aug 16 2016 7:55pm
Forum: E-Bike Technical
Topic: Definitive Tests on the Heating and Cooling of Hub Motors
Replies: 2101
Views: 396503

Re: Definitive Tests on the Heating and Cooling of Hub Motor

Sorry for the radio silence! We actually stripped and rebuilt the two prototype bikes with the sinks fitted into road configs for some real world testing, and entered them in the TT1500 Moto Class over the weekend to see if i could put my money where my mouth is and prove them in a practical setting...
by sketchism
Aug 02 2016 4:13am
Forum: Battery Technology
Topic: Turnigy Multistar - lightweight 10C cells
Replies: 514
Views: 76480

Re: Turnigy Multistar - lightweight 10C cells

I know i probably seem like a huge Multistar fan but i wanted to share some real world results, i've been running a Sabvoton and MXUS and QS205 with 26S 2P 32Ah multis for a while now, at between 130 and 160 Batt Amps, mostly offroad, jumps and some pretty intense hill climbs with Joe Bonner The las...
by sketchism
Aug 01 2016 11:30pm
Forum: E-Bike Technical
Topic: Definitive Tests on the Heating and Cooling of Hub Motors
Replies: 2101
Views: 396503

Re: Definitive Tests on the Heating and Cooling of Hub Motor

CNC machined mounting holes, M5 Nylock nut/bolt fixings I like that your objective is a premium product. Head clearance to fit with Nord-loc washers? Nylocks are generally ineffectual in my experience. Thank you for making these. I would love to help you beta, and have access to a motorcycle chassi...
by sketchism
Aug 01 2016 12:23am
Forum: E-Bike Technical
Topic: Definitive Tests on the Heating and Cooling of Hub Motors
Replies: 2101
Views: 396503

Re: Definitive Tests on the Heating and Cooling of Hub Motor

I'm kind of surprised that over 15 years of ebike hub manufacturing have passed and yet this simple heatsink part hasn't been made until now.... It's kind of sad. i think the fact that i come from a computer science and automotive background helps a bit, heatsinks and radiators lol, the idea isn't ...
by sketchism
Jul 31 2016 10:05am
Forum: E-Bike Technical
Topic: Definitive Tests on the Heating and Cooling of Hub Motors
Replies: 2101
Views: 396503

Re: Definitive Tests on the Heating and Cooling of Hub Motor

Assuming they fit I'd be interested in being a beta tester. Let me know where this goes. Tom They will fit all hubs with the 'standard' 222mm OD (MXUS, Leaf, QS, Crystalyte etc) can be run single or in pairs http://i.imgur.com/z4TnUS1.png?1 I've been doing further computer modelling and in (very ro...
by sketchism
Jul 28 2016 11:07pm
Forum: E-Bike Technical
Topic: Definitive Tests on the Heating and Cooling of Hub Motors
Replies: 2101
Views: 396503

Re: Definitive Tests on the Heating and Cooling of Hub Motor

Well, its official, the factory is paid and the first run is on its way, expected to arrive within 18 days They worked out more expensive than i had hoped but they will still be cheaper than buying computer heatsinks and mucking around getting them to fit which was my goal for the project, for the p...
by sketchism
Jul 26 2016 3:26am
Forum: E-Bike Technical
Topic: Definitive Tests on the Heating and Cooling of Hub Motors
Replies: 2101
Views: 396503

Re: Definitive Tests on the Heating and Cooling of Hub Motor

Awesome work sketch, looking forward to seeing the samples. Definitely the right call on segmenting to make installation possible without lacing changes, if you can snake a three piece through the spokes I think that would be optimal. Worth testing on some smaller diameter rims with large spokes to...
by sketchism
Jul 25 2016 6:06am
Forum: E-Bike Technical
Topic: Definitive Tests on the Heating and Cooling of Hub Motors
Replies: 2101
Views: 396503

Re: Definitive Tests on the Heating and Cooling of Hub Motor

Having four pieces will be easier to ship. Since it only has to be installed once, I wouldn't be bothered if there were eight or twelve pieces, especially if it made it easier to mount without removing spokes. I have a 205/H35 hub with one-cross 12-ga spokes in a 19-inch moped rim. The QS 205, Crom...
by sketchism
Jul 23 2016 2:54am
Forum: E-Bike Technical
Topic: Definitive Tests on the Heating and Cooling of Hub Motors
Replies: 2101
Views: 396503

Re: Definitive Tests on the Heating and Cooling of Hub Motor

I mounted the prototypes through the spokes but had a bit of trouble, i think simply 2 spokes and letting them sit loose will give you enough clearance to slide them in and position them version 5 below, i added a little more space between the fins for more efficient stationary radiation Based on m...
by sketchism
Jul 19 2016 6:43am
Forum: E-Bike Technical
Topic: Definitive Tests on the Heating and Cooling of Hub Motors
Replies: 2101
Views: 396503

Re: Definitive Tests on the Heating and Cooling of Hub Motor

I'll definitely be in for a set for my QS 205. So I wonder if using two 15mm spread apart would be more efficient as one single 30mm in the middle? Is this something your thinking of doing soon? I'd rather go this route than epoxy a bunch of smaller non removable ones around the hub. Super cool. To...
by sketchism
Jul 19 2016 5:46am
Forum: E-Bike Technical
Topic: Definitive Tests on the Heating and Cooling of Hub Motors
Replies: 2101
Views: 396503

Re: Definitive Tests on the Heating and Cooling of Hub Motor

Nice word combination: Porcupine on Statorade ;-) Interesting work sketchism, if Justin would jump in and test the combo on the stand.... Question: Can the fins be mounted through the spokes? More than happy to send as many to Justin as he wants if he finds them interesting enough to do the testing...
by sketchism
Jul 19 2016 4:22am
Forum: E-Bike Technical
Topic: Definitive Tests on the Heating and Cooling of Hub Motors
Replies: 2101
Views: 396503

Re: Definitive Tests on the Heating and Cooling of Hub Motor

Quality work sketch! Have you tried playing with the height of the fins ? Giving the motor a big mohawk is cool but if you can get decent results from something lower profile that may appeal to some. I wonder if you'd get the same ~70% efficiency with a 30mm fin that's around half the height? Possi...
by sketchism
Jul 18 2016 10:28pm
Forum: E-Bike Technical
Topic: Definitive Tests on the Heating and Cooling of Hub Motors
Replies: 2101
Views: 396503

Re: Definitive Tests on the Heating and Cooling of Hub Motor

Interestingly during modelling, the thinner version (15mm) is still 72% as effective as the 30mm with 50% of the mass, because it's smaller and stays hotter while under the same thermal load it has a higher Delta T between its fins and the air at all times and can dump its thermal load faster for a ...
by sketchism
Jul 18 2016 10:17pm
Forum: E-Bike Technical
Topic: Definitive Tests on the Heating and Cooling of Hub Motors
Replies: 2101
Views: 396503

Re: Definitive Tests on the Heating and Cooling of Hub Motor

and it would not be good tilt a bit all fins to fan mode ?? (It's just an idea) :roll: . I did look at having angled fins as well as Pin Fins and axial, notched and solid fins, but the manufacturing method of extrusion makes this radial design less expensive to produce by a factor of two over the n...
by sketchism
Jul 18 2016 9:41am
Forum: E-Bike Technical
Topic: Definitive Tests on the Heating and Cooling of Hub Motors
Replies: 2101
Views: 396503

Re: Definitive Tests on the Heating and Cooling of Hub Motor

They have a tab on each side and short M5 bolt with a nylock nut to apply clamping pressure around the hub allowing much cheaper CPU thermal paste to be used and making them removable. (i still may have to shorten the fins behind the tab for easier access) Thanks. Yea, removing 2 fins and 8mm wrenc...
by sketchism
Jul 18 2016 7:46am
Forum: E-Bike Technical
Topic: Definitive Tests on the Heating and Cooling of Hub Motors
Replies: 2101
Views: 396503

Re: Definitive Tests on the Heating and Cooling of Hub Motor

@ sketchism Cool sinks! What is the hub diameter they work on? How do you fix them to the hub using thermal paste? Is there some fancy clamp not present on the picture or screws? If screws, how do you manage to insert and tighten them? At the moment i'm still finalising the design, i played with ha...
by sketchism
Jul 18 2016 7:15am
Forum: E-Bike Technical
Topic: Definitive Tests on the Heating and Cooling of Hub Motors
Replies: 2101
Views: 396503

Re: Definitive Tests on the Heating and Cooling of Hub Motor

Good stuff Sketch. I'm glad I'm not the only one who's trying something out with these heat-sinks. Because I'm just adding them to all my other pre-existing cooling mods, it's hard for me to quantify there effectiveness, but it seems like they are pretty dam effective, even just arbitrarily. Cheers...
by sketchism
Jul 18 2016 7:01am
Forum: E-Bike Technical
Topic: Definitive Tests on the Heating and Cooling of Hub Motors
Replies: 2101
Views: 396503

Re: Definitive Tests on the Heating and Cooling of Hub Motor

I'm doing some testing on these hub heatsinks and ill be able to post some meaningful conclusive results shortly, but so far adding a heatsink/radiator been amazingly effective, in ride tests on the prototypes we've been seeing up to 70-80% improvement in thermal handling & even greater shedding at ...
by sketchism
Apr 23 2016 6:19am
Forum: Items for Sale - New
Topic: QS MOTOR,0.5-14kW Electric Hub Motor Manufacture China
Replies: 1340
Views: 268995

Re: Cheap BLDC controller, 200A, suitable for 96v 8000w moto

so yep its a passthrough for the CA to pull a hall signal from for speed, i'd already tapped one of the halls but thats handy to know
by sketchism
Apr 20 2016 10:07am
Forum: Items for Sale - New
Topic: QS MOTOR,0.5-14kW Electric Hub Motor Manufacture China
Replies: 1340
Views: 268995

Re: Cheap BLDC controller, 200A, suitable for 96v 8000w moto

What specifically, does the "hall speedometer" wire do on the sabvotons?

is it a hall passthrough to pull a signal from for a CA?