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  1. district9prawn

    Neu 8057 6kW left hand drive hardtail with vesc and encoder

    The small tension wheel by the front sprocket isn't enough. It just helps the chainline clear the bottom bracket shaft. I ended up using a spring loaded chain tensioner. 25H chain should work fine for those rickshaw motors.
  2. district9prawn

    Neu 8057 6kW left hand drive hardtail with vesc and encoder

    I've also been playing with silent HFI for sensorless tracking at low/zero speed this week as this has recently been added to the vesc firmware. I have it configured to inject in d-axis at half the switching frequency so it isn't totally silent at 15kHz but not an issue on the road. It works...
  3. district9prawn

    Neu 8057 6kW left hand drive hardtail with vesc and encoder

    I blew the power board on the V2 controller this week. I'm pretty sure it was my fault. I disassembled the controller to check for water ingress as I had done a lot of riding during wet weather recently. I forgot a few screws and a week later, the mosfets under the missing screws blew :oops...
  4. district9prawn

    FLIPSKY new 20s 100A tiny controller (vesc based)

    This seems to be a pattern of behaviour with Flipsky. Very similar (but not identical) hardware emerges some time after they presumably get their hands on a design. Then they are not very forthcoming with firmware. A couple of years ago I asked them if they planned to sell something higher...
  5. district9prawn

    NEW QS 165 MOTOR

    Could send the encoder signal to a microcontroller and output emulated halls?
  6. district9prawn

    New ground-up ESC - MESC_FOC_ESC

    Should be ok to track rapid acceleration of a small motor with a reasonable loop freq. Haven't tried on real hardware though. Another problem is that it will track 180 degrees out of phase in the reverse direction so need some logic to check speed and adjust sign of the summer to ensure smooth...
  7. district9prawn

    New ground-up ESC - MESC_FOC_ESC

    A quadrature PLL like this seems to do the trick in simulation. Output is speed, which you can integrate to position. I would like to try sensorless foc on an stm32h7 and play around with some algorithms.
  8. district9prawn

    New ground-up ESC - MESC_FOC_ESC

    Nice work with sensorless foc and porting to the F405. I will definitely give it a go since it will work with existing hardware. Since you are integrating the bemf and calculating atan2 anyway, would it be worth implementing a quadrature PLL to track angle with better noise immunity.
  9. district9prawn

    A Small 6 fet Vesc 6 Design

    The formula to calculate flux linkage is 60 / (2*pi*sqrt(3)*p*kV) where p is pole pairs.
  10. district9prawn

    A Small 6 fet Vesc 6 Design

    If you enter in your correct flux linkage value manually are you able to spin the motor in foc?
  11. district9prawn

    FLIPSKY new 20s 100A tiny controller (vesc based)

    Due to the higher input voltage, it will most likely use low side current shunts and discrete gate drivers, as opposed to the DRV chip in the v4 and v6 hardware. The controller losses will not be different when running at say 25% and 50% duty, assuming phase current is the same. Switching...
  12. district9prawn

    FLIPSKY new 20s 100A tiny controller (vesc based)

    No way its capable of continuous 100A battery current. Curious to see if it is really 20s capable.
  13. district9prawn

    Direct Torque Control insights and examples?

    The literature seemed to be mostly 6 step commutation examples and simulations. I suppose it would be a useful technique if that was all your micro was capable of.
  14. district9prawn

    Neu 8057 6kW left hand drive hardtail with vesc and encoder

    I've been using it almost daily since July 2020 when I posted it so it seems ok for my setup at least. Benjamin recently put out a dev firmware with field weakening so probably best to give that a go.
  15. district9prawn

    Vesc hgltech 75v 200amps

    You should connect the throttle 5v to the vesc 3.3V supply. This way you will keep the signal value below the maximum of 3.3V.
  16. district9prawn

    Sin/Cos to quadrature encoding conversion? Has anyone tried?

    I found an example of a microcontroller based converter here. There is even an example firmware. An easier solution might be to simply buy an encoder and attach it to the shaft end.
  17. district9prawn

    Arduino Nano Cycle Analyst (and other) companion TidBits

    Looks like this is shaping up nicely now that you have a clear idea of how you want it to behave with different inputs and outputs. Check out the AnalogReadSerial or DigitalReadSerial example arduino sketches. Most (all?) arduino boards can send serial data through the usb port. So you can...
  18. district9prawn

    Adding hall sensors - Best positions?

    As long as they are 120 electrical degrees apart it will work. Between the stator poles (red dots) is probably easiest. Another way is to 3d print a ring that goes around the shaft and embed small magnets in the ring corresponding to the rotor magnet positions. Then you place your hall sensors...
  19. district9prawn

    Calling All Linux Users(who want to help a newb)

    I can get the iso from https://www.microsoft.com/en-au/software-download/windows10ISO after selecting my version and language. Does that not work? I was in a similar situation to you where I wanted to switch to Linux but did not want to give up all the games. I now game in a windows vm on qemu...
  20. district9prawn

    I'm looking for developers/engineers interested in high current (+1kA) controller development

    Did progress ever get made on this project? I've been playing around with instaspin recently for fun (strange idea of fun I know). I've been working towards getting a controller going with the 28004x.
  21. district9prawn

    Single stage RC left hand drive

    Nice parts, I really like the brake/sprocket adapter. Is regen or braking possible on the castle controller?
  22. district9prawn

    JBC CD Soldering Station Question

    I bet there's a tip that can do what you're after :lol: Doesn't it just use a resistive heating element like most other stations?
  23. district9prawn

    phaserunner error code 1-8

    Surely the controller is bad since you get normal values with the good PR on the same motor. You can try measure the voltage drop across the body diodes of the mosfets with the dmm diode tester and see if there is anything funny there.
  24. district9prawn

    phaserunner error code 1-8

    Sorry I meant measure the voltage with your multimeter and see if it agrees with what the controller reports.
  25. district9prawn

    phaserunner error code 1-8

    Of course the controller is not going to drive the mosfets if one phase is at a very low voltage. Have you actually measured the open circuit phase voltages with the controller powered on? I see you have measured the phase to supply negative resistance with a dmm and not found any shorts.
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