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  1. N

    Controller shunt mods

    Oh I see, thanks
  2. N

    Controller shunt mods

    so if the voltage is very low, then a pot can be used? in the other post, it was mentioned that I would need a huge pot or rheostat to control the current. here we are not controlling the current (fixed) but instead the voltage so a large current can still move across the pot?
  3. N

    Controller shunt mods

    oh ok cool, got it
  4. N

    Controller shunt mods

    for the pot in parallel, how does it not take on the a large current, like the shunt is doing?
  5. N

    Controller shunt mods

    oh ok cool got it about the shunt resistor, but I still need to break the trace for the wiper connect, correct? Ive seen complicated work arounds for measuring current with an arduino, seems this type of shunt could do the same thing?
  6. N

    Controller shunt mods

    yes i figured it was the holidays :D the shunt resistor goes right across the board solder shunt? then the pot in parallel to the shunt resistor? so the stock shunt is basically providing a reference for a comparator to limit current? How does that circuit work, if I may ask?
  7. N

    Controller shunt mods

    so I put the trim pot across the shunt then the wiper is connected past the trace cut? as shown here?
  8. N

    Controller shunt mods

    so i dremel tool off some of the trace, then put a pot in between? if its a 3 terminal pot, how do I connect the terminals?
  9. N

    Controller shunt mods

    I have outlined the trace in black, it seems to be on the opposite side of the board, this is coming from the underside of the shunt, opposite of the black wire side; seems to be going under the gate driver, or to a pin on it, then onwards to the comparator? then to the MCU
  10. N

    Controller shunt mods

    using a cont. tester, I traced on the opposite side of the board and the trace from the shunt opposite of the black wire, goes under a 2101 gate driver onto a pin of a LM 339, will post a pic later
  11. N

    Controller shunt mods

    :thumb:
  12. N

    Controller shunt mods

    The picture is not the best, but the shunt is there, hard to see the traces though
  13. N

    Controller shunt mods

    for example, on a display panel,where I have my arduino nano display, could a variable pot be used instead of a solder shunt? I guess the resistor values would have to be very small for this to work
  14. N

    Controller shunt mods

    I see the drain current for the IRF 3805 is 98 amps so I think Im good as you said, no need to parallel any more mosfets just heat sink them or open air it
  15. N

    Controller shunt mods

    IRF 3205 Yes I have some heat sinks out of old PC, was thinking about putting the 6 mosfets on it, but dont know if the leads to the gates etc will be too long. maybe use the PTC or NTC sensor with the arduino or nano to sense when the temp gets too high and power the fan on the heat sink, its...
  16. N

    Controller shunt mods

    My controller has 6 mosfets, so if I increase the amp capacity of the shunt, I think i must add more mosfets. If I added 6 more mosfets, could I add them in parallel, or does this mod require a new board and controller?
  17. N

    Controller shunt mods

    thanks very much, I will hack the solder bridge shunt off a damaged controller and try that, for the voltage divider, I am lost trying to find it. i see a trace coming from the shunt towards a gate driver, but seems to be going under the driver to where, difficult to tell
  18. N

    Controller shunt mods

    very informative thanks very much :thumb:
  19. N

    Controller shunt mods

    Yeah I think I found it, but its going to the chip that controls the Motor, maybe that chip has that capabilty built in as well. If it was going to an op amp, that means the amps across the shunt are at the micro level?
  20. N

    Controller shunt mods

    yes but Im asking how does the shunt work? Is it the same principle as a current meter that uses a shunt? what part of the controller senses the current, or what is the shunt connected to?
  21. N

    Controller shunt mods

    thank you for your reply. So there is a dedicated chip to monitor the current? I cant see any traces on my controller to a chip, only the shunt from the black power wire to source lead of a Mosfet. Are you saying that any modification to the shunt, like a small amount of extra solder, will...
  22. N

    Controller shunt mods

    If I may ask, how do these two solder pieces limit or increase current limits?
  23. N

    Phase voltage polarity and mosfets

    I understand that the ebike motor winding config is in a Wye configuration, with 6 mosfet power transistors switching the polarity of the poles to repel the rotor magnets, but would like to ask the following; 1. my controller is rated at 36 volts, does that mean that for one phase wire, there...
  24. N

    Halls sensors giving strange voltage reading across blk to signal wires

    Thanks for your reply for the voltage on the MOSFET gates, normally I see Vgs at 5 volts, for a digital gate input, say for example an arduino digital pin is driving a MOSFET for motor control speed, but for brushless motor MOSFETS, I see allot of examples where the gate is at the same voltage...
  25. N

    Halls sensors giving strange voltage reading across blk to signal wires

    yes new controllers are an option when I get the money so what limits the speed, the controller or the voltage? I topped out at about 30 KPH, also, can the arduino be used as a controller? I has several PWM outputs and an ADC, Im guessing its allot more complex than that, for ex. commutation...
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