# PMSM Simscape Block - Inertia mask parameter

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Giovanni Pizzolante le 12 Avr 2021
Déplacé(e) : Sabin le 24 Déc 2022
Hi all! :)
I have a doubt about a mask parameter to be set in the following Simscape block (https://it.mathworks.com/help/physmod/sps/powersys/ref/permanentmagnetsynchronousmachine.html). The parameter to be set is the Combined machine and load inertia coefficient J (kg.m2) and I was wondering if it should be set considering the size as motor side or load side? It is not specified anywhere.
In particular, the rotor has its own inertia J_rotor and also an Harmonic Drive (transmission ratio k> 1) is attached to the motor, which has its own inertia J_HarmonicDrive (defined at the harmonic drive input side). I was wondering how the J mask parameter should be set. Should I pass J = J_rotor + J_HarmonicDrive (i.e. sum of motor side inertias) or J = (J_rotor + J_HarmonicDrive) / k ^ 2 (i.e. sum of load side inertias)?
Thanks!
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### Réponse acceptée

Dakai Hu le 22 Avr 2021
Déplacé(e) : Sabin le 24 Déc 2022
Hi Giovanni,
In this case, if you can figure out what J_HarmonicDrive is, I'd use J = J_rotor + J_HarmonicDrive as the inertia parameter for the PMSM block.
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Dakai Hu le 17 Mai 2021
Déplacé(e) : Sabin le 24 Déc 2022
Torque constant and permanent magnet flux linkage are always evaluated by peak values, whether its phase-to-neutral current or or phase-to-neutral voltage. So to answer your question it should be (N.m / A_peak).
Giovanni Pizzolante le 18 Mai 2021
Déplacé(e) : Sabin le 24 Déc 2022
@Dakai Hu thank you very much.

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