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C2000WARE-MOTORCONTROL-SDK: several questions about motor driving

Nicolas Grangier
Prodigy 140 points
Part Number: C2000WARE-MOTORCONTROL-SDK

Hello,

I work with the 10st version of code composer studio (often with the is07 lab) to drive some motor.

I have questions about it, I couldn't answer even with the documentation.

How sensitive the actual algorithm is to the R and L variations ?

What is the ideal sampling frequency for high speed like 10kRPM and more ?

What is the linearization method used ?

Are 3 shunts really better than 2 ? at high speed ? 

How to chose well the Bandwidth ?

  • 0
    TI__Guru** 111020 points
    Nicolas Grangier said:
    How sensitive the actual algorithm is to the R and L variations ?

    There is no exact value about this which depends on the motor specification, hardware board, and control requirements, more accuracy much better performance.

    Nicolas Grangier said:
    What is the ideal sampling frequency for high speed like 10kRPM and more ?

    Also depends on the motor spec like inductance, pole pairs. Low inductance motor and high pole pairs need a higher PWM frequency. The sampling and PWM frequency should be higher than 18 times the maximum electrical frequency of the motor.

    Nicolas Grangier said:
    What is the linearization method used ?

    This estimator algorithm is based on the motor model, and the controllers are PI.

    Nicolas Grangier said:
    Are 3 shunts really better than 2 ? at high speed ? 

    Yes, especially at over modulation.

    Nicolas Grangier said:
    How to chose well the Bandwidth ?

    That depends on the system control requirements, it could be a generic control topic and found some descriptions in the related textbooks.