Learning Forum

[yildirimi19]

Hello esteemed Ansys users,

While trying to perform a multi-objective optimization in RMxprt, I have encountered an issue and would appreciate your support on this matter.

Within the RMxprt module in Ansys Electronics, I designed a motor by selecting the "IPM Synchronous Machine" type from the "Generic Rotating Machines" toolbox. I then created a setup from the "Analysis" tab, ran the necessary simulations, and viewed the results using the design sheet option.

Afterwards, I parametrized several motor parameters, such as the stator outer diameter and the stack length. I carefully defined the parameter ranges so that the motor geometry would not be distorted. Then, using the "Optimization" section under the Optimetrics tool, I selected the "Multi-Objective Genetic Algorithm (Random-search)" method. I defined the following objective functions:

• StatorSlotFillFactorParameter

• InducedVoltageperUnitParameter

• EfficiencyParameter

• FullLoadStatorTeethFluxDensityParameter

However, when I start the optimization, I receive the following error messages:

"Failed to extract solution data for ... $Yoke='19.15mm'' at '$D' with value '245mm', please exclude this sweep value from the calculation range. (3:33:01 PM Apr 08, 2025)"
"Failed to evaluate calculation 'StatorSlotFillFactorParameter'. (3:33:01 PM Apr 08, 2025)"

After these errors appear, the optimization process stops.

When I use only the EfficiencyParameter as the objective, the optimization completes without any issues. However, when I include the other parameters — or even try each of them individually without EfficiencyParameter — I still encounter the same errors. Similarly, when I use the "Parametric" tool instead of "Optimization" to perform a parametric sweep, I face similar issues.

I would be very grateful if you could inform me about the cause of this issue and share a possible solution.

Thank you in advance for your support.

[Timos]

Hi, this is an issue of the "Generic Rotating Machines" that has been already reported. Unfortunately, results such as StatorSlotFillFactorParameter cannot even be reported in a rectangular plot so this might be the issue. This cannot be reproduced with Adjust Speed Synchronous Machines so kindly use a different machine category. Apologies for the inconvenience.