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ST FOC Library v3.3: state observer + PLL coeff. calculation

Question asked by JonPi on May 15, 2013
Latest reply on Aug 27, 2013 by Gigi


I’m using the state observer + PLL algorithm and am trying to understand how the coefficients are calculated by ST MC Workbench v2.1. I couldn’t find everything I wanted in the docs, so could anyone give me the equations for the following parameters:

  • F1 (scaling factor)
  • G1. This seems to be proportional to K1, but I couldn't find the equation anywhere in the docs. I only found the equation for K1 in the ST FOC library user manual and it yields the same result as ST Motor Control workbench.
  • F2 (scaling factor)
  • G2. Similar to G1, it seems to be proportional to K2;only the equation for K2 can be found in the user manual.

Many thanks for that.