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  1. S

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

    Hi, I'm a bit lost... the max speed I get with the BluOSEC app or in diagnostics mode is 66km/h and the max speed is 37km/h with the KT-LCD3... as if the display interferes with the controller. I spent days trying to find a solution but I didn't find anything... Does anyone have an idea? Have...
  2. S

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

    Hi, the speed when unloaded is the same (35km/h). When I reach 35km/h the current decreases and I have no power anymore. The max current doesn't change anything.
  3. S

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

    Hi, I have a problem with my fatbike. The max speed I got with a 48V battery was 35km/h. I decided to get a 72V controller with a 72V battery to increase the max speed, but it doesn't work at all. The max speed remains at 35km/h. Does anyone have an idea? Here is my config.h Another problem ...
  4. S

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

    I have read it for a long time and I don't want to bother you stancecoke. Thanks a lot.
  5. S

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

    Thank you stancecoke for your patience... and for sharing your experience. I can't change the duty cycle of the PAS signal. Do I have to create an additional circuit? That's weird. I'm going to put a non-inverter follower circuit between the controller and the torquesensor. Regards.
  6. S

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

    Hi, how to activate this driving mode? PAS sensor with torque simulation and reverse step detection In this mode, I just need a PAS. No Torque sensor, no Thumb Throttle. Am I wrong? What are the most important parameters in this mode? Regards
  7. S

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

    Hi, is there a way to use the firmware without a throttle and without a torque sensor? My torque sensor is the problem of my system. The PAS works well but the torque sensor signal is dead. I don't want to use a thumb throttle. I'd like to know if it's possible to use my bike without a thumb...
  8. S

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

    I got it. You can limit you battery current to 50 amps, it's no matter for the 18fet KT. Each mosfet supports 150 amps and there are 3 mosfets in parallel. But it could be damaging to your motor. Regards
  9. S

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

    There are something wrong with your table : speed = radius times angular velocity (speed in m/s radius in meter and angular velocity in rad/s) With your values : 26 inch wheel : speed = 27.4 m/s = 98 km/h !!! Mechanical power = torque times angular velocity (power in W, torque in N.m and...
  10. S

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

    Hi, I don't know what kind of motor you have, but 20 amps in a motor winding is already a lot. If your motor is a 1000W, a 16S battery provides 60V power = voltage times current => current = power / voltage = 1000/60 = 16.7A I would start testing 15 amps max for the battery current. If the...
  11. S

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

    Hi, I had the same issue : ui32_SPEED_km_h and ui8_control_state don't exist. Have a good day.
  12. S

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

    Yes I did. I think I was pretty accurate. Ok. I thought the firmware used the current sensor because the value is read in the program. It's only used for the zero crossing. Thank you. Have a great day.
  13. S

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

    Thanks stancecoke, I measured currents and printed out their adc values. For ui16_BatteryCurrent I obtain the equation: ui16_BatteryCurrent = 2.68 x I_batt + 315 For ui16_adc_read_phase_B_current I obtain the equation: ui16_adc_read_phase_B_current = 2 x I_phase_B + 511 I'd like to limit the...
  14. S

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

    Hello, in diagnostic mode, when I print out ui16_control_state, ui16_BatteryCurrent, ui16_current_cal_b I get : 28 316 315 without pedalling, weird??? when I pedal and brake, only ui16_BatteryCurrent increases. Is that normal? It doesn't seem correct. To tell the truth, I'm a bit lost... I...
  15. S

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

    Thank you stancecoke.
  16. S

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

    Hello, I still have problems : - When I stop pedaling, the motor takes time to stop... too much time. Can we change this? - I'd like to limit the motor current to 20 amps, how can I be sure it's 20 amps? Does anyone know how to solve these problems? Have a good day.
  17. S

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

    Here are the VGS signals with the 90V/12V.
  18. S

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

    My board is dead!! While measuring VGS, I made a shortcut!! 3 MOSFETs are dead.It's not that bad. I have now an arm with only two transistors instead of six. I'll send you scopes later.
  19. S

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

    The MOSFET for this board is an IRFB4110 (instead of a TK150E09NE for KT 48V) You are right, the output voltage of the second LM317 is Vout=15V. But the Gate Threshold Voltage of the MOSFET is less than 4V. So there are chances that VGS is enough to saturate the transistor : there is no need...
  20. S

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

    The bluetooth communication is now perfect. I got rid of the two LM317s and the two resistors. I used instead a DC/DC converter 90V/12V. It doesn't heat up anymore. And the system is stable. I can now study the behavior of my bike with the bluetooth diagnostic. Everything works now. The motor...
  21. S

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

    I think you're right, there must be a problem with the 5V. I tried to supply my controller with another power supply, the bluetooth communication works well until 40V. Beyond 40V, the communication is really bad. The two LM317 are maybe the cause of the problem.
  22. S

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

    I unsoldered a wire that I assumed was the input to the SPEED sensor and soldered it to the pin X5 of my KT controller and now the speed is read on pin 30 of the microcontroller. The speed is displayed on my KT LCD3 ... Small steps .... Now the motor spins !!! Always ... and the speed is 62km/h...
  23. S

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

    I don't know why, but the throttle is reading now and I have 37 min and 180 max....
  24. S

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

    I tried but t doesn't change anything. Thanks
  25. S

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

    Here you are : I'm starting to wonder if the problem isn't the controller itself ... maybe? The resistors that heat up a lot (200°C!!) that's weird... the ADC that doesn't work... I'll try to check the PCB. Thanks
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