Clarification on BLDC Motor Model Parameters in PSIM

Toto123
Toto123 Altair Community Member
in Community Q&A

Dear Altair Support Team,

I am a student currently working with the BLDC motor model in PSIM, and I have encountered a few aspects that I find challenging to understand (Images below) :

  1. Alpha (α) Parameter: I initially thought that the alpha parameter represented the phase commutation delay which impacts directly the touque smoothness. However, upon adjusting its values, I observed changes in the slope of the phase voltage waveforms rather than in the torque smoothness (for alpha beetwen 0 and 30. Could you please clarify the exact role and physical significance of the alpha parameter in the BLDC motor model?​
  2. Vrms/Vpk ratio and the angle alpha Datasheet Table: I am curious about how this table was constructed. Specifically, were these parameters obtained through experimental measurements, simulations, or calculations?
  3. Relationship Between Shaft Time Constant, Friction Coefficient, and Moment of Inertia: I am trying to grasp the physical interpretation of the relationship among these three parameters.

Thank you very much for your assistance.

Best regards,

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