Recent content by sgds23

I'm pretty sure I'm doing exactly what you suggest for my throttle. I ripped the initial code off https://www.roboteq.com/index.php/applications/100-how-to/156-controlled-regen-braking And then modified for AWD (with different motor types, tires sizes), and a backoff of the zero point to get...

There has been a spurt of papers recently pointing out that cheap BLDC motors rarely have their hall sensors precisely aligned and that this has deleterious affects on commutation efficiency. Cf: https://www.iosrjen.org/Papers/vol3_issue1%20(part-1)/I03114955.pdf...

Not everybody loves the idea of using carbon fiber rims with hub motors, but I've had no problems as long as I use nipple washers. It's also -- relatively -- easy to get fat CF rims in 36H. My preferred supplier is Nextie, eg., https://www.nextie.net/premium-fatbike-wild-dragon-90mm-NXT90WD s.

Day late, dollar short.... nonetheless, here is how I did my thumb throttle (from a snowmobile)... https://endless-sphere.com/forums/viewtopic.php?f=6&t=44696&p=804385&hilit=awd+fatbike+throttle#p804385

(Seems unlikely that nobody else has brought this up, but I couldn't find a thing through ES or google search...) What is the verdict on the new(ish), 2017 update of the crystalyte HS/HT series, now called "UFO"? The covers are new (I assume in part to allow ferro fluid), aluminum stators...

Ha-- thanks for asking. I miss my knee stroller (allowed me to travel through airports very quickly), but I'll admit the metal plate in my ankle has limited motion a tiny bit when playing basketball or tennis. Fortunately, I already kinda sucked at both. I ended up rebuilding the ebike since I...

Thanks to some bystanders who saw what happened, the police report put the blame squarely on the driver. But given the shabbiness of his vehicle, driver's lack of english, and -- most importantly -- my ultimate culpability in driving like an idiot, I chose not to pursue... S.

I've been using a CF fork (and CF rims) with hub motors in both front and back for two to three years. 1) Clearly part of the appeal is fetishistic-- as others have noted, saving a small amount of weight doesn't matter much in terms of performance. (For a host of reasons, starting with you...

Newsflash: If you make enough dumb decisions in a row, something bad will likely result. In my case, that day's dumb decisions began with deciding to race a motorcycle from a stop light, on a damp evening, without any lights on my bike, and culminated with me deciding that the car at an...

Well, yes, but other than my method being apparently completely wrong, it should be significantly more accurate. After all, I'm accounting for voltage sag _at each time step_. and systematically measuring over power curve. For the completists, my controller code looks like: motor_channel =...

I'm clearly missing something obvious, but this used to work, and all I did was change from a BMC v2 to an eZee -- which I thought were roughly the same.. So I'm trying to empirically measure RPM/V. My program steps through 5 power levels (think of them as 25%, 50%, 75%, 100%), runs the wheel...

Going Backwards I continue to improve my bike, albeit at a much slower pace since I prefer to actually ride. Hardware: On the hardware side, probably the biggest improvement has been the wheels. I found 36H, 65mm carbon fiber (I know, I know..) rims from Nexie. After some struggles I've been...

I've built a new version of my fatbike -- slightly different motors, slightly different frame, a lot less spaghetti wiring. But the biggest improvement so far is the software. I stole Roboteq's clever method of using speed (rather than current) sensing to, essentially, calculate BEMF in order...

Thanks, Amberwolf-- I should have realized that about the phase wires. Whoops. I'm still scratching my head about what could be wrong, given that the tester seems to indicate both phase wiring and halls are ok. (And I've tried 3 different controllers..) I guess I'll try some more fiddling...

I recently hooked up a new Crystalyte HS4040. Initally, it ran, albeit poorly (I later discovered an intermittent connection on one of the Hall wires). But after riding it for a few blocks, the motor gave up the ghost, and now will only do a half-hearted jerk on startup. I took a multimeter to...