FEA uses different methods to calculate and get voltage*current and torque*speed, so we would not get the same values on the input and output power in the simulation. Additionally, we could not consider any mechanical losses such as windage and friction loss, core loss or stray loss in the input power calculation too.
My suggestion is
Output power = torque*speed*stacking factor - core loss - other mechanical/stary loss
Input power = output power + all losses
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