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  1. johnrobholmes

    75-5 ZERO MOTOR REWIND

    Ive wondered if the inductance of the motor would always block the pwm frequency , but haven't measured enough motors to make the concrete assertion. If that's always the case, then just wind it with the 14ga and watch the force and sharpness while bending around the stator edges. Game on!
  2. johnrobholmes

    Long time no see!

    Not quite, but the rotor will allow for some insane field weakening and zero cog force. Will use a 32 bit mcu and rotory hall for encoder style FOC
  3. johnrobholmes

    Long time no see!

    I've still got lots of 12 and 13ga nipples, probably 14ga too. I did some eco race quad wheels a while, along with non leaning trikes. Radial outer and 2 or 3x inner was the magic bullet for us. Nothing new since the model T, lol!
  4. johnrobholmes

    Long time no see!

    Yep , still in the RC realm. Although I don't get to design cool stuff as much as possible right now, as the low price point stuff is far more demanded than high price point. Working on a something right now though that will be a first for the RC industry, although nothing new for EV.
  5. johnrobholmes

    Long time no see!

    I'm glad to report that I've yet to have a single wheel build come back for repair in all these years.
  6. johnrobholmes

    75-5 ZERO MOTOR REWIND

    22ga would be 6 parallel strands to equal 14ga. Not impossible to manage.
  7. johnrobholmes

    Long time no see!

    Well, its been a while gents! I had to step away from spokes and wheelbuilding except for my own projects and local customs, and ended up being sucked into facebook in efforts of business marketing for the "day job". Got a big ass CnC machine, wore my ass out working overtime for years, sold...
  8. johnrobholmes

    75-5 ZERO MOTOR REWIND

    Assuming you can get the same copper fill with thicker wire, the disadvantages of thicker are difficulty of winding, greater chance of stator insulation damage, and possibility of your end turns being taller and contacting the housing. high pwm frequency favors thinner conductors due to skin...
  9. johnrobholmes

    what's the best nipples to use when rebuilding a hub motor?

    Sounds like a vendor that is just flipping parts. They would be brass. There are many grades of brass though. Cheap nipples will be cheap materials.
  10. johnrobholmes

    what's the best nipples to use when rebuilding a hub motor?

    Name brand. The ones from Dan's competition aren't too bad, but they aren't great either. Anything ebay or amazon is bottom of the barrel unless it's a trusted vendor selling name brand. Plenty of fakes from shady vendors though.
  11. johnrobholmes

    Open loop regen braking

    My Google fu of ES finally resulted in this thread from Justin which suggests that bouncing the low side fets will get my result without knowing motor or current direction. Only half the strength of a full brake, but I'm attempting to do this blindly without feedback or modeled motor...
  12. johnrobholmes

    Open loop regen braking

    I'm doing some thinking about how regen braking can be implemented without a current sensor. For simplicity, i consider an h bridge. Typically, it seems that regen braking is done by reversing the bridge from state A to B, but without a current sensor it will reverse motor direction once bemf is...
  13. johnrobholmes

    XPD: open-source keywin e-bike lab replacement

    figured it out. pyserial wasn't installed. Also is no longer listed in the sourceforge downloads so I found it here https://sourceforge.net/projects/pyserial/
  14. johnrobholmes

    XPD: open-source keywin e-bike lab replacement

    I'm getting no traction with a fresh install on a newer computer, win7. Seems the xpd.pyw file isn't doing anything. Did the python and gtk install, ive got the idle and command line working. pyw file does nothing, no gui now. what gives? Been a while since I had to trudge through this...
  15. johnrobholmes

    Sur-Ron - New Mid drive Bike

    What brakes did you choose?
  16. johnrobholmes

    Sur-Ron - New Mid drive Bike

    I was heavily considering getting an X . Saw the Ludi R version and broke down and got it instead. I blame getting 1 million views on my first Sur Ron vid for this decision :lol: I know this forum doesn't moan and groan too much over the prices, especially since most of us have been...
  17. johnrobholmes

    Yuyang king controller wiring

    Well, it worked. For about 5 minutes. As I was going through all the phase/ sensor combinations the ESC quit responding. Hooked up another ESC and the motor, batt, and throttle are fine. Bummer! Took the controller apart and no damaged or smoked components to be seen. Time to...
  18. johnrobholmes

    Serious FOCer (84V VESC 6 based controller)

    Nice work! Subbed 8)
  19. johnrobholmes

    Yuyang king controller wiring

    Excellent, thank you. I didn't want to assume it was batt + and fry it. Seems just as plausible that it could have been a 5v+ enable circuit. Thanks again! Anybody know the quiescent current of these controllers when it's not turned on?
  20. johnrobholmes

    Yuyang king controller wiring

    A buddy got a yuyang from Luna cycle. Bluetooth 60a 72v one. I'm guessing we need to connect the "power switch" wire to batt positive like the old xie chang, cause it ain't booting up. Confirmation before I crack open the case to trace it and pretend I know what I'm doing? :lol:
  21. johnrobholmes

    Sur-Ron - New Mid drive Bike

    I can report that the BMS has extremely low quiescent current. Broke my leg 4 months ago (so no riding lately) and the battery has been sitting for at least 6 months total now with hardly a drop to the voltage or % on the display. I've been monitoring monthly. Very pleased.
  22. johnrobholmes

    Alta Motors Redshift

    Excellent observations, thank you for sharing. Sounds like I would be a map2 sort of rider. I'm considering one of them now :lol: How loud is the electronic switching noise compared to the Sur Ron? Chain noise?
  23. johnrobholmes

    Sur-Ron - New Mid drive Bike

    STock controller. The supermoto wheelset with a 48t was perfect . No real loss in top speed but certainly was a 12% boost to torque through the whole throttle range.
  24. johnrobholmes

    Sur-Ron - New Mid drive Bike

    I put the 58t rear sprocket on my bike with the stock rear wheel. Same story other people have, it has great low end but feels gutless past 15mph since there isn't enough load now. The 17" wheel with the 48t was perfect. I think between 55 and 52t would be a much better spot for the...
  25. johnrobholmes

    Sur-Ron - New Mid drive Bike

    I got sick of the first gen air shock needing constant work. m-YnR1SfNJk
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