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  1. rj7855

    2 Speed Xiongda hubmotor

    That it "hunts" going uphill was/is completely expected IMHO, switching gears is done by changing the motor direction ; I guess that takes a couple of seconds and during that time the motor does not provide any power to the wheel and your bike will slow down to below the lower threshold. I...
  2. rj7855

    Am I missing any other small geared hub motors?

    Apparently a very nice little hub motor the Xiongda 2 speed hub motor http://endless-sphere.com/forums/viewtopic.php?t=58490
  3. rj7855

    Commuter Booster - <1kg Friction Drive

    So the 170kV motor you order should max out at 40.4 kmh.... that sounds perfect for me
  4. rj7855

    Commuter Booster - <1kg Friction Drive

    Which is ofcourse not available here :-( What about UGLU? ( http://www.youtube.com/watch?v=e7vJHWDhiXo ) I think it was mentioned here in this thread... but not going to dig thru 50 pages
  5. rj7855

    Commuter Booster - <1kg Friction Drive

    Count me in ! then I can finaly getting to work on my current limiting solution
  6. rj7855

    Commuter Booster - <1kg Friction Drive

    great news Adrian!
  7. rj7855

    Commuter Booster - <1kg Friction Drive

    I got my first parts (a new logic analyzer and a 5 channel scope) this Saturday so I can start current limiter my project this week. Bad news on the sine wave controller front (that should ease/eliminate the RC whine); I´m unable to source a key component, there only exists a few sensorless...
  8. rj7855

    Commuter Booster - <1kg Friction Drive

    ç Ahhhh.. progress............... I like progress.... have a great (and fruitful) weekend
  9. rj7855

    Commuter Booster - <1kg Friction Drive

    to prevent the motor starts if you don't have the throttle corrected you need to add a resistor in the servo tester, between the throttle signal and ground. if the throttle input is left unconnected it can (slowly) build up voltage due to leak currents in the servo tester, this will make you...
  10. rj7855

    Commuter Booster - <1kg Friction Drive

    The bill of material would be one micro controller (eg, an simple atmel) a few (less then 10) pot´s, resistors & capacitors,5 small wires to connect it to the bike electronics ( +5, 0 and pwm to the ESC and an two additional wire the connected to 0V near to the batteries and near the ESC; the...
  11. rj7855

    Commuter Booster - <1kg Friction Drive

    The electronics to this are really simple and most of it are needed anyway to translate the throttle signal (0...5 v analog) to a PWM signal that the ESC uses as input. (normally done by the servo tester many people use) The current can be measured by looking at the voltage over a shunt resistor...
  12. rj7855

    Commuter Booster - <1kg Friction Drive

    Both Sinewave using a pwm at 96KHz, I hope to get some Toshiba tb6582fg soon (the only chip I could find that does sine wave on a sensorless motor) if I can't get those chips I will (try to) implement it in a existing controller. (in that case I might even try to change the motor to WYE for...
  13. rj7855

    Commuter Booster - <1kg Friction Drive

    Much of the noise produced is directly released to the way the motor is being controlled ( sensorless, square wave commutation & pwm ) while we using RC ESC´s there will be not much that can be done about it but with a custom ESC it would be possible to greatly enhance the acoustic properties...
  14. rj7855

    Commuter Booster - <1kg Friction Drive

    the problem is the 100A K-Force being on backorder at hobbyking. Did you test that 170KV motor yet, I´m very interested to know if that one would be the better option for me ( lower KV means less top but more torque and I have plenty of hills but no room for speeding on my commuter route )
  15. rj7855

    Commuter Booster - <1kg Friction Drive

    @Kepler, you were using the Turnigy Brushless ESC 85A w/ 5A SBEC with the same motor? @adrian, What is (+-) the amount of movement between the idle and engagement stops? I may be able to contribute a bit to the project, while I suck at metal working (and therefore probably unable to recreate...
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