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  1. Vbruun

    'lightest.bike' 1.7kg 1000w mid drive

    I somewhat agree. If you just want power, I think you should buy a qs mid mount motor and get it over with. What the lightest really brings for me is the promise of good torque sensing in a high quality drive that could be reliable. Still hoping it will end up like that one day :)
  2. Vbruun

    'lightest.bike' 1.7kg 1000w mid drive

    Great points. Buying the lightest ever motor to pair it with a heavy hub is kind of backwards. But honestly, I only think the lightness of this drive is relevant in eMTB applications. Otherwise, the massive battery needed for range at speed will outweigh the ligness gains anyways.
  3. Vbruun

    'lightest.bike' 1.7kg 1000w mid drive

    The nexus 5 only has overdrive ratios. 1:2,6 in 5th gear. https://www.bike-discount.de/en/shimano-nexus-sg-c7002-5cd-5-speed-internal-geared-hub
  4. Vbruun

    'lightest.bike' 1.7kg 1000w mid drive

    The 5 speed is probably strong enough. It is used with the big Shimano motor which pulls 5-700w peak and then geared for a top speed of about 18 mph. If you want to gear twice as steep for that sweet 36 mph top speed, you can use twice the motor power with the rear hub seeing the same torque.
  5. Vbruun

    Motor & Controller for Efficiency Racer!

    This is not true. A bldc motor still needs to have commutation via PWM even if run at full throttle/voltage. If the duty cycle is low and the motor is low inductance, some losses will increase, but I would need to see data to believe that this is a significant issue. Freeing yourself from...
  6. Vbruun

    Motor & Controller for Efficiency Racer!

    You can model the efficiency of a motor via Grin motor simulator if you can get the necessary information. Also, you can try playing around with the settings to get a feel for how things influence each other. Motors generally aren't most efficient when run at close to max power, so if you...
  7. Vbruun

    Motor & Controller for Efficiency Racer!

    Is weight a concern?
  8. Vbruun

    'lightest.bike' 1.7kg 1000w mid drive

    Good point!
  9. Vbruun

    KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

    This is the way the open source firmware works. the PID is a bit slow and you feel resistance when turning the wheel backwards because computation is never turned off. Stancecoke says that the PID is fine when moving fast and there is no extra resistance when coasting using this method. If...
  10. Vbruun

    'lightest.bike' 1.7kg 1000w mid drive

    I think they would not work that well. The motor torque would feed back into the bottom bracket i think.
  11. Vbruun

    Nervagon's Directionless, and Doomed Build

    Would a nursert in the frame be sufficient to hold the motor in stead of clamping around the downtube?
  12. Vbruun

    Optimizing DD motor and moped rim for 60km/h and 2.5kW (and other questions)

    Why do you want to use hub motors? Induction motors are way cheaper and run on the right voltage for grid use.
  13. Vbruun

    BionX motor giving a lot less power

    Probably the strain gauge has come loose. It can be fixed but it takes skill and patience
  14. Vbruun

    MT30 / MR30 as phase wire connector

    It does convert the voltage. That's why they don't
  15. Vbruun

    KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

    I have used a cheap st-link v2 copy dongle. I don't think it matters which controller you use the firmware on. I have no first hand experience with the 6-fet, but since it is rated for lower current by KT I would think that the 9-fet can take a bit more. The phase current is limited by the...
  16. Vbruun

    KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

    Good luck. I have had great luck with the firmware. Big thanks to stancecoke, casainho, Andrea_104 and all the other contributors.
  17. Vbruun

    KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

    I bought mine from topbikekit. I used the 22a battery limit like the original and twice that for phase amps. It was fine and didn't get hot. I don't think the stock plug can take more current than that, but I don't know the limit of the controller.
  18. Vbruun

    KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

    Actually both.
  19. Vbruun

    KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

    Yeah i've used it. It works great. Best fork is Andrea-104 or torque from x4. They're more stable.
  20. Vbruun

    Controller for constant speed application

    VESC can do that. Flipsky 75100 probably fits the bill.
  21. Vbruun

    New "TSDZ2 Torque Sensor Central Motor"

    I don't think that you need the current ramp in this application. The motor produces constant torque @ constant current. I believe the reason that the current ramps were beneficial the TSDZ2 project was because battery current and not phase current was controlled. Phase current (which determines...
  22. Vbruun

    GaN and IMS MESC controller boards

    Very impressive. I have been following with great interest, but I don't have much to contribute other than congratulations and well done!
  23. Vbruun

    DIY Toroidal Axial Flux PM

    Did you try the autodetect function?
  24. Vbruun

    tsdz2 48v with 36v battery OSF

    This is voltage related. You can try adding some field weakening, but it does not work all that well. You really need a 52 volt battery ideally.
  25. Vbruun

    BBS-FW: Open Source Firmware for BBSHD/BBS02 Controller

    Any plans to add support for torque sensing? Possibly by torque sensing crank arms and then via the throttle input? I want that so bad!
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