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TMS320F28069M: Estimation Accuracy of Fast Observer

Brian Wang0
Expert 5240 points
Part Number: TMS320F28069M

Hi team,

We are trying to help customer using Instaspin solution for sensorless motor control on delivery robot(like AGV).

The robot need to avoid obstacles so they need speed control.

We hope to know about the speed estimate accuracy of fast observer, to evaluate whether we can use sensorless control to replace their hall based solution.

Do you have a data about the accuracy or the performance is equal to a encoder of how many bits? 

Thanks a lot.

  • 0
    TI__Guru** 114520 points
    The resolution of speed and position is related to the current&voltage feedback signal of the h/w board, target speed, load, and motor parameters, it's difficult to have absolute data compare to an encoder. The speed error is less than 0.5Hz or 0.5% of reference speed if the current/voltage feedback error is less than 1%.
  • 0 in reply to Yanming Luo
    TI__Expert 5240 points
    Hi Luo,

    Could you please tell is this our best performance? And what is the lowest running speed that we can achieve this performance?

    Thanks
  • 0 in reply to Brian Wang0
    TI__Guru** 114520 points
    It's a simulation data that assume the resolution of the current/voltage feedback signal is less than 1%. The real performance depends on load, target speed, the signal quality on h/w board. Sensorless-FOC is difficult to achieve better performance during low speed under heavy load, especially below 5% of the rated frequency of the motor.