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  1. V

    What is Startup Torque

    What is starup torque? I have used the STM32 FOC algorithm using digital hall sensors and the 3 phase current sensing. When ever the 2 wheeler vehicle starts the expectation is it shall accelerate very fast. My clarification is do i need to write a separate algorithm for very high starting...
  2. V

    STlink v2 doesn't connect

    Post in ST community you will get support. ST community
  3. V

    Difference between PWM OFF and Iq=0

    I am implementing the code for throttle in Torque control mode with varying Iq. My clarification is in case of throttle equal to 0%, should i implement the PWM off function or just make Iq=0. I tried both options when i make PWM off or StopMotor function and when throttle is 0% it is switching...
  4. V

    Start up issue in the vehicle FOC + BLDC motor + Digital Hall sensor

    One observation is the phase currents jerking and not pure sinusoidal during start up. The jerking is due to position information? The phase currents become sinusoidal after some time.
  5. V

    Start up issue in the vehicle FOC + BLDC motor + Digital Hall sensor

    It is not an ST dev kit it is our own customised board with ST micro but hardware design concept is based on ST evaluation board. But thankyou very much the reply. I will probe other parameters.
  6. V

    Start up issue in the vehicle FOC + BLDC motor + Digital Hall sensor

    startup issue is this the only way?
  7. V

    Start up issue in the vehicle FOC + BLDC motor + Digital Hall sensor

    I am using the STM32 source code and FOC, i am facing the issue of start up where the vehicle goes in steps and jerks and does not start smoothly when throttle applied. The position sensor is digital hall sensor. I plotted the hall angle and the Iq variable As you can see initially FOC is...
  8. V

    Hall Electrical Phase Shift

    Any help or any links to study about this?
  9. V

    Hall Electrical Phase Shift

    I am referring to the ST document about motor control, it is too complicated a subject to understand and remember. I am trying to understand the hall electrical phase shift as shown below My understanding of the importance of the phase shift parameter is below, please correct me if i am wrong...
  10. V

    Space Vector PWM

    The maximum is Vdc/sqrt(3) bus voltage, the rms voltage is Vdc/sqrt(6). The line to line RMS voltage is sqrt(3) * Vdc/sqrt(6) = Vdc/sqrt(2).
  11. V

    Space Vector PWM

    Do i need to take the resultant of the 3 sine vectors, then i get the following result The other method i understood from net using the clarke and park transformation is as below
  12. V

    Space Vector PWM

    I think it is VBus/2 the maximum vector of U.
  13. V

    Space Vector PWM

    This is what i tried but got stuck up. Could you please help me with next steps?
  14. V

    Space Vector PWM

    Ok thank you very much for the reply, i am really confused with 2 other questions, i don't get answers 1. When we apply FOC what is the maximum bus voltage applied on the phases (line voltage or phase voltage), if the applied voltage from the power supply is Vbus. I read it is 2/sqrt(3)*Vbus...
  15. V

    Space Vector PWM

    The document is nxp user guide page 48.
  16. V

    Space Vector PWM

    I had this doubt for very long time. I am referring to the NXP user guide and regarding the space vector modulation. and when it is plotted For 1,0,0 it is 2UDCBus/3 but in the space vector diagram it is 2/sqrt(3) UDCBus, there is factor sqrt(3). How is this additional factor derived?
  17. V

    Clarification on Id, Vd FOC

    The question is on FOC, when we are running the FOC without flux weakening then Iq = Torque component and Id = flux component, we have to keep Id=0 to produce maximum torque, does it also mean that Vd is also zero?
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