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  1. M

    Open Sensorless BLDC controller

    walls99, thanks for the reply. That method makes good sense. -Matt
  2. M

    Open Sensorless BLDC controller

    walls99, that's super cool! I think yours is the first controller I have seen that implements closed loop control for slow speed commutation. Do you have any references to your 6-position scanning method? Also, have you seen http://scolton.blogspot.com/? He has some interesting ideas on PMAC...
  3. M

    Rickys Keewee stealth RC bike buildlog

    Excellent thread Ricky, top notch! You may have stumbled on it already, but I think you may find this blog interesting: http://scolton.blogspot.com/search/label/3ph He is doing the most thorough work on BLDC and BLAC motor design/controller design that I have seen (granted, i don't have an...
  4. M

    Motobecane Cady with an RC drive

    The infinieon blew it's FET after I abused it :evil: The Turnigy has no built in current limiting, I am sure that it would have also blown. -Matt
  5. M

    Motobecane Cady with an RC drive

    gwhy, yeah I have been watching your thread. :D I can`t recall exactly what my ratio was, but it worked out to about 30 - 35mph no load based on kv of the motor at 48V. The 15mph was not the top speed, I did not get a chance to test that, the controller blew too soon. I think I was in the...
  6. M

    Infineon programming cable question (non Prolific chipset)

    Short answer: no you cannot long answer: the serial port on your computer uses the rs232 protocol which has signals from -12V to +12V, with a '1' bit being 3-12V, and '0' being -3 to -12V. Your ttl serial port on the infineon micro uses 0-5v signals, with a '0' being ~+5V and '1' being ~0V...
  7. M

    problem with bmsbattery 6Fet shunt mod

    When you say the controller was limiting to 40amps is this between the battery and the controller? The current between the controller and the motor is always equal or larger (can be much larger) than the current between the battery and controller. This means that at partial throttle you could...
  8. M

    Infineon programming cable question (non Prolific chipset)

    When you plug in the USB-TTL adapter, if it is properly installed it should create a new COM port This will show up under ports in the device manager. To get there go: Right–click My Computer, click Manage, and then click Device Manager If a new port is created, make note of it's number...
  9. M

    Please help! Need Turnigy 80-100 130kv

    and don't forget our British members propensity towards using words like Antipodean? :lol: Good post Jeremy, well said. -Matt
  10. M

    SOLVED! Infineon Cutting out Question

    Yeah, apparently :D to be fair I knew I was pushing it, and am not too surprised that it blew. Also, I was nowhere near 40A from the battery, more like 20A peak, I suspect it was hitting 75amp phase current limit which really hurt it. I have opened it up, and the fet that blew also melted it's...
  11. M

    Motobecane Cady with an RC drive

    Well, I thought it might be time for an update. The bike has moved under it's own power. I got the motor up and running as discussed using an RC speed controller, and also ordered a 6-fet infineon controller. I have mad a couple topics on the forum since then about trying to program the...
  12. M

    SOLVED! Infineon Cutting out Question

    Well... that was fun. I found 30amp phase to be a little anemic, and it was only drawing 8amps from the battery, so I upped the battery current to 40 amp ;-) and set the phase to 75 amp ( note this is with stock fets ;-) ) it was a lot better, and there was NO cutting out... except after a...
  13. M

    SOLVED! Infineon Cutting out Question

  14. M

    SOLVED! Infineon Cutting out Question

    OK, time for some more test results (this time with pictures :P ) I pulled out the usb scope and soldered some test leads to the positive sides of the shunt (after removing my previous shunt mod), C20, and C19. The following were done with my previous settings of 30A. Here is the first test...
  15. M

    SOLVED! Infineon Cutting out Question

    Awesome job guys! I for one am very excited, I think we may have just cracked this egg!! :lol: Now who was that testing the mini-monster 6-fet who was having high power cutting out problems, they may be interested in hearing about this? -Matt
  16. M

    SOLVED! Infineon Cutting out Question

    If my numbers were correct, adding a 1k resistor across C20 would double the cutout current to ~260A!! I wonder if your original idea of increasing R43 may be better? That way we can filter out the transient spikes, while still keeping our fets from turning to plasma if the motor phases short...
  17. M

    SOLVED! Infineon Cutting out Question

    As I think about this more, I think this makes alot of sence. I suspect that if we scope it we will find the RC time constant of C20 and R43 will be quite low. I suspect that the ADC current input is polled by firmware, mabye at around 100hz? This allows average current regulation, but is much...
  18. M

    SOLVED! Infineon Cutting out Question

    I'm sorry ZapPat, I think I still may be missing something. Assuming the 'brutal overcurrent cutoff ' is in the firmware, and assuming the only way the firmware has to measure the current is through the shunt... by changing my shunt from 4.5mohm to ~0.4mohm, I have increased all firmware based...
  19. M

    SOLVED! Infineon Cutting out Question

    My thought was to try to see if I could 'trick' the controller into allowing higher current. If I had lowered the current by 10X then I would have been the same ~30A true phase current as pre-mod. I have not yet added caps, but I think that ghwy has and it did not cure the problem. I think...
  20. M

    SOLVED! Infineon Cutting out Question

    OK, well that was fast... I just went ahead with my shunt mod.. and the results aren't good. I started by measuring the voltage drop across the stock shunt at a constant measured current. I repeated this for a few currents from 1A to 3.7A (I couldn't go higher without figuring some way to load...
  21. M

    SOLVED! Infineon Cutting out Question

    I thought I would try testing the effect of changing the phase current and rated current settings, I didn't expect to see much, but ran into some interesting results. All tests were done using 12S lipo and 20V LVC (to prevent accidentally tripping the LVC), and with motor on the bench unloaded...
  22. M

    SOLVED! Infineon Cutting out Question

    gwhy, I just want to say thanks for doing all these tests :D You seem to be consitently a step ahead of me, which means I get to sit back and wait for your results :mrgreen: -Matt
  23. M

    SOLVED! Infineon Cutting out Question

    Sorry for the lack of responses, I haven't gotten much done on the bike this week, I bought a new metal lathe to live at ENTS (Edmonton New Technology Society ENTS.ca) like this: so I have been spending my evenings welding up a stand for it. Hopefully this weekend I will get some more work...
  24. M

    Infineon programming cable question (non Prolific chipset)

    So, before I scoped my hall signals, I tried running the controller off of one of my 6S packs, and it works fine! I was able to ride the bike under its own power. The belt drive was slipping and I only got up to 15km/hr but it was still sweet! :D So, the issue seems to be with the controller...
  25. M

    SOLVED! Infineon Cutting out Question

    RESULTS!!! :D So, I managed to reprogram the controller to up the current and lower the LVC. This didn't help. I also made a bracket to mount the halls externally. This was cool, but also didn't help. With the lowered to LVC (to 20V??) I was able to run the controller off of one of my 6S...
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