Search results

Date Relevance Most replies

  1. The7

    Question on FET driver stage for an BLDC controller

    The picture shows a typical FET driver stage for an BLDC controller. The C will be charged up once in one cycle during the conduction of the low-side FET. Assume IR2101 takes a contant 0.1 mA from C. C is initially charged to 12V. Find the time for C to discharge to 2 V. Charge at 12V = CV =...
  2. The7

    Hall Senor Location in PUMA/BMC motors

    The picture from Fechter shows that the Hall sensor is located at the gap between coil poles. BEMF and Hall signals http://endless-sphere.com/forums/viewtopic.php?f=2&t=4528 Re: Asymmetrical voltage in Puma. Why? http://endless-sphere.com/forums/viewtopic.php?f=2&t=4542 This Puma could be...
  3. The7

    Some improvement in Series/Paralle Switching

    The red wire could be added such that there is only one contact point in series connection.
  4. The7

    Asymmetrical voltage in Puma. Why?

    http://endless-sphere.com/forums/viewtopic.php?f=2&t=4528 In the picture of AL1020, the applied voltage is symmetrical because the applied voltage is in phase with the BEMF. Seems this is the common goal to be achieved by designers. In the picture for Puma (Fechter), the applied voltage is...
  5. The7

    BEMF and Hall signals

    Continued from http://endless-sphere.com/forums/viewtopic.php?f=2&t=4512 Crystalyte 4000: (Updated **) 1) It has 48 stator poles and 16 magnet poles (8 pole-pairs). This gives 3 stator poles per magnet pole (180 deg). 1 stator pole = 60 deg. There are 16 stator coils in one phase 2) Hall...
  6. The7

    Motor Frequency for various BLDC motors

    Frequency at hub speed of 300 rpm: A) Gearless Hub Motors 1)Crystalyte 4000: 300 x 8 /60 = 40 Hz 2)Crystalytle 5000: 300 x 12 /60 = 60 Hz 3)GL2 : 300 x 23 /60 = 115 Hz B) Geared Hub Motors 1) Puma : 300 x 5 x 16 / 60 = 400 Hz 2) P2 : 300 x 4 x...
  7. The7

    Li cell works in sub-zero?

    Will Li cell work at temperature below 0 deg C?
  8. The7

    E-Ride in Winter

    My first e-ride in Canada winter.
  9. The7

    Convert BCL to Pseudo MCL controller!

    For Xlyte BLDC controller. Add three diodes Da, Db and Dc as shown. Without diodes Da, Db and Dc (before mod): The shunt measures only the battery current. It is an BCL controller. With diodes Da, Db and Dc (after mod): Assume FET-Ah and FET-Bl are active. When FET-Ah is PWM(ON) and FET-Bl...
  10. The7

    Engine braking = regen braking in ebike !?

    Engine braking in car = regen braking in ebike!? Engine braking is not permitted for trucks (over a certain weight) for long decending downhill. Why? If so, should we use regen braking in ebike? Why?
  11. The7

    e-brake cut-off on RHS?

    I could connect the e-brake cut-off to RHS and/or LHS of the brake levels. I prefer that the e-brake cut-off is only on the RHS because I could apply throttle and apply the LHS brake at the same time while starting. When I feel the ebike moving, I release the LHS brake to let the ebike move...
  12. The7

    Turbo Mode for my AL1020

    Since upvolt from 24V to 48V for my AL1020 the throttle is Ok for open road. But it is a bit rough on slow paths and sidewalks where the max speed is less than 20 km/h. So added an DPDT switch to switch the batteries in parallel to get 24V 24Ah for "norma"l mode and in series to get 48V 12A...
  13. The7

    16" Mag Wheels with 350W motor.

    Seems this "16" Mag Wheels with 350W motor" is a good candidate for modification. The stock has an electronic speed limit to 32 km/h and has an motor size like an e-vespa. With 48V or 60V NiMh or Li it could fly over 50 km/h easily!?
  14. The7

    Half twist throttle

    Half twist throttle is used in many ebikes. I found it painful to use when comparing with full twist throttle. Whick do you like? Half twist or full twist throttle or thumb throttle?
  15. The7

    Balance 2 New SLA 12V batteries.

    Bought two new 12V 12Ah to add to the stock 12V 12Ah. The stock 12V are very balance at the end of usage, say 11.74V and 11.74V. Always within 0.01V different. They are charged and discharged in series. The two new 12V are very poor. At the end of the first usage. one read 11.58V and other...
  16. The7

    Coasting Downhill => Damaging Battery/Controller ! ?

    For non-freewheeling motors only: If you coasting downhill with an speed greater than the no-load top-speed, the motor becomes an generator which will generate an voltage greater than the battery voltage. Good point : 1) Charging your battery for free. Bad points: 1) Overcharging and damaging...
  17. The7

    New Controller has 3 Big cap. Why?

    The new version X-controller has 3 big capacitors. Ananda controller has also 3 big cap. Why they have 3 big cap? Old version controller was bench test OK and developed an faulty driver IR2101 during an road test (happened at current limit of 18A). All FETS remain OK. Reason unknown - But...
  18. The7

    Another Xlyte Controller for my AL1020 !

    The old version was faulty due an bad FET driver IR2101s. See the post: http://endless-sphere.com/forums/viewtopic.php?t=1659&start=15 I am reluctant to repair because it does not have the 3 big cap. This afternoon, bought another used one which is a newer version. This newer one has the 3 big...
  19. The7

    Color code for Crystalyte Controller plug?

    http://www.users.bigpond.com/solarbbq/crystalytecontrollers.htm shows a different color code for the plug from mine. Have the color code been changed?
  20. The7

    Simulator equation !?

    The simulator of ebike.ca uses: Imotor = Ibatt / D Vmotor = D*Vbatt - (1-D) Vdiode - Imotor Rcont where Imotor and Vmotor are the average values. They should use the effective values for these equations to estimate the effective torque and power at any speed and PWM duty cycle D as: I'motor...
  21. The7

    Pedal First Controller for Free-wheeling Motor ???

    Is there any PF (Pedal-First) controller for free-wheeling motor? PF controller uses the back emf for the switching the DC voltage into a 3-phase supply for the BLDC motor. For free-wheeling motor, the pedalling will not turn the motor, so no back emf => no 3-phase supply => no motor rotating...
  22. The7

    X5/Puma + 20" + Li => Fashsion??

    It seems that X5 + 20" + Li or Puma + 20" + Li is a new fashion in e-bike. X5 is quieter and robust. Puma is lighter with less drag in pedal-only. Which would you opt?
  23. The7

    Modify Instant Start Controller to Pedal First ??

    Is it possible to modify and Instant-Start controller to Pedal First externally? After observating the relatioship of the Hall signal and the output voltage waveforms, it seems it could be done with simple external modification.
  24. The7

    Compare Pedal-First and Self-Start Controllers?

    Use the same voltage and ampere Pedal-First and Self-Start Controllers for the same motor. After starting up, which controller will have a higher max speed and higher torque? Why? It will be great if you have personal experience on both type.
  25. The7

    Color and Phase Sequence of Xtyle and other motors?

    Xtlye motors use Yellow, Green and Blue (Y, G, B) to mark the phase winding and the Hall sensors wires. The motor of AL1020 uses the same color code and the phase-sequence is Y-B-G. The spacing of the Hall signals is 120 deg and the output voltage (V yb) leads Hall signal (Hy) by 60 deg. 1)...
Back
Top