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Iron losses over simulation time
Posted 14.04.2025, 02:46 GMT-4 Electromagnetics, Results & Visualization Version 6.3 2 Replies
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Hello everyone, I'd like to analyze the transient behavior of iron losses in order to determine the duration of the settling process. Coming from an ANSYS Maxwell background, I'm still getting used to COMSOL. I'm currently modeling a motor similar to the one shown in the following example: https://www.comsol.com/model/analyzing-electric-motor-and-generator-designs-97091
My first study is a stationary analysis that provides me with the magnetic flux density and torque values. This is followed by a "Time to Frequency Losses" study using the "Rotating Machinery, Magnetic" physics interface. From this, I obtain the parameter rmm.Qh, which represents the volumetric loss density in W/m³. By integrating this quantity and multiplying by the length, I calculate the total iron losses in watts. The file is in the attachment.
Am I correct in assuming that this value represents an average over all computed time steps? When I look at the dataset from the "Time to Frequency Losses" study and export the rmm.Qh value, I only see X, Y, rmm.Qh (see attachment). Which leads me to conclude that rmm.Qh is only a one-dimensional vector. This leads me to believe that the iron losses calculated in this study are not time-dependent—is that correct?
That brings me to my question, how do I plot the iron losses over the simulation time?
Another question that comes to mind: when calculating losses using the Steinmetz equation, are the results already based on a steady-state condition? In other words, do I even need to consider the transient behavior or settling time in that case?
Best regards
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