Search found 153 matches

by Murfix
Sep 03 2014 12:55am
Forum: Stand-up E-scooters and E-skateboards
Topic: My finished electric skateboard
Replies: 10
Views: 1578

Re: My finished electric skateboard

Congratz on making the Instructables newsletter! =)

You're in my mailbox as well as in a kazillion others'!
by Murfix
Aug 28 2014 12:10am
Forum: Stand-up E-scooters and E-skateboards
Topic: Hall sensored setup: does it work properly?
Replies: 7
Views: 524

Re: Hall sensored setup: does it work properly?

Well the magic is definitely in the ESC since the sensors are just ... sensors. Yes, I'm using 50mm motors (dual rear). Maybe even more important than starting smoothly is doing a full stop much better. With Hall sensors, the brakes can be controlled much more efficiently as well. I'm investigating ...
by Murfix
Aug 27 2014 12:29am
Forum: Stand-up E-scooters and E-skateboards
Topic: Hall sensored setup: does it work properly?
Replies: 7
Views: 524

Hall sensored setup: does it work properly?

Hey guys,

Who is using a sensored setup and likes its performance?

I find mine disappointing. It doesn't seem to run any smoother than my regular setup. I was at least expecting for it to start from standstill in a smooth way.

Am I using bad components, or is this the case for everyone?
by Murfix
Jul 29 2014 11:46am
Forum: Stand-up E-scooters and E-skateboards
Topic: Circular clamp motor mount
Replies: 12
Views: 2242

Re: Circular clamp motor mount

I'm trying to build an electric longboard and I have a pair of 180mm paris v2 trucks on it. I'm wondering if anyone has a CAD file of a clamp type motor mount for circular trucks that they'd be willing to share so I don't have to re-invent the wheel. Thanks! I just updated my thread with some detai...
by Murfix
Jul 28 2014 4:26am
Forum: Stand-up E-scooters and E-skateboards
Topic: Circular clamp motor mount
Replies: 12
Views: 2242

Re: Circular clamp motor mount

Heya,

Yes I do! I've been on a holiday, but now I'm back. I got 2 versions of the clamping mount, for 50mm and 63mm motors, to make them as small and light as possible. They fit mountainboard's regular skate trucks AND Paris trucks. I will take some pictures this evening to show you.
by Murfix
Jun 26 2014 9:05am
Forum: Stand-up E-scooters and E-skateboards
Topic: from push scooter to EV: advice and comments welcome!
Replies: 46
Views: 11724

Re: from push scooter to EV: advice and comments welcome!

Congrats, those pieces look awesome, especially the large pulley! Where's that Hall sensor you're talking about? Is it used to measure the position of the thumb throttle? About the spring: maybe it's worth testing to see if you can use the same spring? By changing the standard tension on the spring,...
by Murfix
Jun 20 2014 7:12am
Forum: Stand-up E-scooters and E-skateboards
Topic: Drevious' E-Longboard
Replies: 62
Views: 7361

Re: Drevious' E-Longboard

Looking awesome!!

Why did you decide to go for chains? Did the belt underperform?
by Murfix
Jun 17 2014 4:33pm
Forum: Stand-up E-scooters and E-skateboards
Topic: GalWiii - software/hardware for controlling e-boards
Replies: 16
Views: 1067

Re: GalWiii - software/hardware for controlling e-boards

Dude, go for it! This would be really welcome for European ES'ers since shipping costs are still a pain for small packages over the seas. If you need help testing/sourcing/programming, I'd be happy to. I just got me an Arduino Uno and finished the 15 starter projects :D Trying to get into µcontroll...
by Murfix
Jun 17 2014 1:34am
Forum: Stand-up E-scooters and E-skateboards
Topic: GalWiii - software/hardware for controlling e-boards
Replies: 16
Views: 1067

Re: GalWiii - software/hardware for controlling e-boards

Dude, go for it! This would be really welcome for European ES'ers since shipping costs are still a pain for small packages over the seas. If you need help testing/sourcing/programming, I'd be happy to. I just got me an Arduino Uno and finished the 15 starter projects :D Trying to get into µcontrolle...
by Murfix
Jun 16 2014 3:56am
Forum: Stand-up E-scooters and E-skateboards
Topic: Roadster E-Board Build (videos added 15/06/14)
Replies: 159
Views: 38451

Re: Roadster E-Board Build (videos added 15/06/14)

Haha yeah, gotta make the most of the summer in the UK! I know it's not the nicest at all. I'm still to have a proper play with the ESC settings, don't think I have any timing adjustment but I can change the acceleration curve. Think I should have the curve start shallow or steep? :? Hard to tell. ...
by Murfix
Jun 16 2014 2:23am
Forum: Stand-up E-scooters and E-skateboards
Topic: It's not electric, not got wheels - but cool as hell!!
Replies: 6
Views: 580

Re: It's not electric, not got wheels - but cool as hell!!

Run this on batteries and you're a billionaire =D

Awesome thing!
by Murfix
Jun 16 2014 2:17am
Forum: Stand-up E-scooters and E-skateboards
Topic: Implementing regenerative braking on electric longboard
Replies: 27
Views: 5816

Re: Implementing regenerative braking on electric longboard

I hope you have also read my rectification of that post, because it was actually wrong. However, I think regen braking might be a useful addon, I haven't tested it yet and I can't tell you how to integrate it. I suggest looking up some documentation about ESC's that claim to have the regen braking o...
by Murfix
Jun 15 2014 4:22am
Forum: Battery Technology
Topic: LiFePo4 C-rating confusion: 1C or 20C?
Replies: 18
Views: 1410

Re: LiFePo4 C-rating confusion: 1C or 20C?

Thanks :) I think my best suitable pack would be 12s2p. It can deliver the amps I need and can still be small and light enough to be carried underneath an eboard. I will definitely be needing a BMS though. I don't want to hook 'em up on the balance charger every time I've been riding. I just want to...
by Murfix
Jun 15 2014 3:21am
Forum: Stand-up E-scooters and E-skateboards
Topic: Electric MBS Comp16 Mountainboard Build
Replies: 40
Views: 4197

Re: Electric MBS Comp16 Mountainboard Build

michaeliam wrote:I could also put a spacer between the motor and the mount to bring the shaft a bit to the right couldn't I?
Yes, that's the way to go!
by Murfix
Jun 14 2014 8:00am
Forum: Battery Technology
Topic: LiFePo4 C-rating confusion: 1C or 20C?
Replies: 18
Views: 1410

Re: LiFePo4 C-rating confusion: 1C or 20C?

Thanks for the explanations. It seems there is a lot more variety in lifepo cells than in lipo cells. Could you recommend a BMS that can handle 50A and peaks up to 100A (for use with 26650's, 40V) ? I'm in Europe if that helps. I've been reading about the characteristics and found tons of charts for...
by Murfix
Jun 13 2014 10:30am
Forum: Battery Technology
Topic: LiFePo4 C-rating confusion: 1C or 20C?
Replies: 18
Views: 1410

Re: LiFePo4 C-rating confusion: 1C or 20C?

Schlafmutze wrote:first one is very unlikely 20c

second one (a123) is.
Thanks for the quick reply.

Could you clarify why I've been reading claims of only 1C? My best guess would be because of a different cell type? For example 18650?
by Murfix
Jun 13 2014 9:40am
Forum: Battery Technology
Topic: LiFePo4 C-rating confusion: 1C or 20C?
Replies: 18
Views: 1410

LiFePo4 C-rating confusion: 1C or 20C?

Hello, I've been searching for appropriate LiFePo4 cells for an E-skateboard battery pack. However I read a lot about those cells having a C-rating of 1. On the other side, I've found cells that claim 20C on the internet. Here comes the nooby question: which is it? I'm looking into 26650 cells mainl...
by Murfix
Jun 04 2014 4:13am
Forum: Stand-up E-scooters and E-skateboards
Topic: Implementing regenerative braking on electric longboard
Replies: 27
Views: 5816

Re: Implementing regenerative braking on electric longboard

We brake by shorting motor phases at the correct timing. This allows current to flow. The generated power is dissipated through heating of the wires and mosfets. With regen, we don't have to dissipate the power because we now have a use for it --> battery. You can try this by connecting 2 motor wire...
by Murfix
Jun 04 2014 1:41am
Forum: Stand-up E-scooters and E-skateboards
Topic: Implementing regenerative braking on electric longboard
Replies: 27
Views: 5816

Re: Implementing regenerative braking on electric longboard

I have to revise my statement. It was wrong. A generator supplies power when an electrical load is connected. Normal braking is applying an electrical load by the ESC. The generated power can't be used so it has to be dissipated into heat. that's why braking is tough on ESC's. When regen braking, th...
by Murfix
Jun 02 2014 3:59am
Forum: Stand-up E-scooters and E-skateboards
Topic: stuff
Replies: 197
Views: 4946

Re: Whys evolve's board so fast?

That being said, a 700W motor can go just as fast as a 2000W motor if they take the same input voltages and have the same kv (ignoring the difference in efficiency is justified IMO). A condition is the load, if the load gets higher, a 700W won't be able to pull it off. For our application, riding at...
by Murfix
Jun 02 2014 3:49am
Forum: Stand-up E-scooters and E-skateboards
Topic: E-GO by Yuneec Internationl
Replies: 284
Views: 57434

Re: E-GO by Yuneec Internationl

Injection molding? What would be the price tag? :o
by Murfix
Jun 02 2014 3:46am
Forum: Stand-up E-scooters and E-skateboards
Topic: Implementing regenerative braking on electric longboard
Replies: 27
Views: 5816

Re: Implementing regenerative braking on electric longboard

As furp said, it's actually regen coasting instead of regen braking. When the motor is forced to spin (ie. coasting) it acts as a generator. We coast a lot so we can regen a lot. The esc has to be able to send the current in the opposite direction and you can only store the amount of current into yo...
by Murfix
Jun 02 2014 2:51am
Forum: Stand-up E-scooters and E-skateboards
Topic: 6" pneumatic tyre and MBS mounts -ALIEN...
Replies: 51
Views: 8534

Re: 6" pneumatic tyre and MBS mounts -ALIEN...

Andres wrote:I think 25 bucks is a fair price for the rims+tyre combo.Cheers
Except that it's 25£, about 42$. Sorry, couldn't resist :p
by Murfix
Jun 02 2014 2:44am
Forum: Stand-up E-scooters and E-skateboards
Topic: Compact Motor Mount and Longbuild build
Replies: 72
Views: 8900

Re: Compact Motor Mount and Longbuild build

Great job!

Was that stone heavy enough to get a curve? I can't really tell from the pictures.
by Murfix
Jun 02 2014 2:27am
Forum: Stand-up E-scooters and E-skateboards
Topic: Marbel carbon eboard
Replies: 38
Views: 6379

Re: Marbel carbon eboard

Beets, Have you tried a sensored setup? Curious as to any difference it makes. My interest would be for other uses, but would be nice to learn more about it. I don't feel a real need for sensors, but it would nice to know there is that option. I guess there were a few posts about it here, must of m...