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  1. fourbanger

    Stator/magnet swept area

    Oh yea! I definitely almost understood half of that last paragraph. :) I still have a LOT of reading to do concerning magnetic fields and lines of flux and, well, everything really. Would it be too presumptuous of me to speculate that it is all of those last issues mentioned that leads people...
  2. fourbanger

    Stator/magnet swept area

    Trying to figure out the relation between the amount of surface area passing a magnet and the amount of power a motor can reasonably be expected to produce. These figures are derived by calculating the stator diameter * 3.14 * stator width. Here are some examples [numbers are in centimetres...
  3. fourbanger

    Motor recommendations for mid-mount

    @amberwolf I had thought about doing something similar with the ram air intake + paper filter - fan. I like the idea of having a fan pulling air through the motor, especially one wired up to a thermostat. That's pretty clever. It's starting to add to the complication of the build a bit, but I...
  4. fourbanger

    Motor recommendations for mid-mount

    Mmm hmmm. Food for thought as always, AW, thank you. What stands out most to me is the point you raise about the possibility of increased drag (cogging effect) of a DD hub hardlinked to the rear wheel with a high ratio. This is something I'd been thinking about for some time without ever REALLY...
  5. fourbanger

    Motor recommendations for mid-mount

    Thought I'd try something different here and ask for a bit of advice... HA! Basically I'd like to keep both the battery and motor, maybe controller (as much stuff as I can, really) INSIDE the triangle. To accommodate this (and because I like the way they look) I'll be using an old school...
  6. fourbanger

    Hub motor mid drive full suspension chopper

    So much awesome here I'm going to comment before even taking the time to read this thread. Been thinking about doing something along the same lines for a while now so it's nice to watch someone else struggle with it first. Keep going! I think you're on the right track. [EDIT] OK I've read...
  7. fourbanger

    Run a 3 phase generator as motor.

    "a) \$I^2 R\$ losses in the copper windings" Ah yes, it's all perfectly clear to me now. :) As usual you have penetrated the heart of the matter: The best kind of motor to drive an electric bike is (in fact) an ebike motor. Surprise! I was looking at ceiling fan motors and humming and...
  8. fourbanger

    Run a 3 phase generator as motor.

    What the hell happened to the draft I thought I saved? Holy cow, that is really irritating! Oooookay. Well anyway, thank you Amberwolf for your response. I'm still really unclear as to why a generator of a given efficiency wouldn't make an equally efficient motor all else being equal...
  9. fourbanger

    Run a 3 phase generator as motor.

    Can it be done? Thinking about it I see absolutely no reason why not, but then again my ignorance in the field of electric motors is profound--get it? Field? I'm looking at this and wondering if it might be just the thing to mount in the frame of a bicycle to drive the left side of the rear...
  10. fourbanger

    Deal on motors/wheels

    He's dropped off my radar as well. Last I heard about a month ago was that he was hoping to get things listed again soon. I assume that would be on the battery clearing house site.. maybe not. I also assume he's a busy guy, and I suspect he might be in the process of sourcing out controllers and...
  11. fourbanger

    mxus xf15 gear hub motor teardown

    Me again. Did you ever figure out how fast you can spin this thing? I'm thinking of mounting one in the triangle and revving the snot out of it then gearing down to drive the left side back wheel. If I could get away with reterminating in delta, that would be pretty cool. My understanding is...
  12. fourbanger

    What if motor watt ratings..

    Thanks dogs. I'm finding it increasingly frustrating dealing with sellers who don't know their own products... an ordeal that I feel could easily be avoided. Ex: Motor A is sold in three versions - 36v 350w, 48v 350w, and 48v 500w. After MUCH probing (almost more like a full on cavity search...
  13. fourbanger

    What if motor watt ratings..

    Burb, excuse me. What if manufacturer's advertised motor wattage was representative of how much heat it could shed rather than produce? Would that make sense? Do the lower wattage motors actually overheat more easily? Less copper? That would account for the slightly lower price between a 1000w...
  14. fourbanger

    Stolen Ebike North Vancouver

    Duly noted.
  15. fourbanger

    Deal on motors/wheels

    Well hey, if it walks like a duck.....
  16. fourbanger

    Deal on motors/wheels

    This has been an interesting thread to keep an eye on. Just out of curiosity, has anyone been able to confirm that this is a BPM code 10? For the record I've never seen a photo of a Bafang anything front motor that has the number 10 in brackets. Rear yes, front no. And what's with the 1 at...
  17. fourbanger

    hub motor stutter/judder doesn't move

    Good call on folks not wanting to fess up to... incidents. Just went out there this morning to have another *closer* look. Axle spinout occurred at some point (front hub). Lock washers were in fact on backwards... *sigh*. I'll take part of the blame for not making a thorough enough examination...
  18. fourbanger

    throttle wiring question

    Hmmm. Sounds like I'd better just try it and see for myself. Thanks!
  19. fourbanger

    throttle wiring question

    @fetcher Good for you if you can pull that off. I haven't built anything powerful enough that can't be controlled with a steady hand (yet) but I could see that being a thing for some people. I have a question about your original mod that brings up the bottom end. I'm looking at the pros and...
  20. fourbanger

    hub motor stutter/judder doesn't move

    Amberwolf, what you say sounds like..... something someone who fixes things for a living would say. It's been damn near a week now and I haven't heard boo from the guy by phone or by email. Not sure what that means exactly; maybe he took it somewhere expensive and doesn't want to tell me so...
  21. fourbanger

    GMAC vs MAC and Infineon vs Phaserunner

    Just out of curiosity, would this mod be able to simulate freewheeling in the GMAC? http://endless-sphere.com/forums/viewtopic.php?f=2&t=37190&p=582952#p546409
  22. fourbanger

    hub motor stutter/judder doesn't move

    Hey, thanks for asking! I'm actually trying to troubleshoot a problem for a fellow down the road who put together his own bike. Motor makes a quick ka-tunk back and forth when throttle is applied then nothing. It will do this repeatedly as many times as you like without disconnecting the...
  23. fourbanger

    hub motor stutter/judder doesn't move

    Mea culpa. I'll have to re-read; I thought he ended up just getting a new controller. For my own part, I must admit I find the search functions here a little cumbersome to use. The php search seems somewhat.. I'll say selective about the criteria offered, and google tends to do the opposite...
  24. fourbanger

    hub motor stutter/judder doesn't move

    So... all these years later this issue has never really been resolved?
  25. fourbanger

    New controller for old bmc v2 motor (like mac)

    I believe I heard somewhere (probably on this forum) that the older BMC motors were a bit picky about which controllers they'd talk to. Something about the hall sensors running at too high a frequency for a lot of controllers. You might do well to get yourself a dual mode controller just in...
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