Efficiency computation with values of a 2D variation curve

Frank_Mau_1
Frank_Mau_1 Altair Community Member
edited January 2022 in Community Q&A

Hi!

In general I want to calculate the motor efficiency in a transient magnetic flux simulation.

I have the output power and input power calculated in 2 different 2D curves:

F2D_TechTuto_BrushlessIPMMotor_overview.pdf -> Page 86 and before.

And I have found the information how to print the mean value of a 2D curve in the output area:

print (CurveVariation2D['OUTPUT_POWER'].y[0].meanValues

What I need is how to use the mean values of curves in a calculation:

Something like: CurveVariation2D['OUTPUT_POWER'].y[0].meanValues/CurveVariation2D['INPUT_POWER'].y[0].meanValues

I want to calculate the efficiency value and put it an I/O parameter or in a 2D curve to check it after postprocessing.

Thanks.

 

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Best Answer

  • C_Favre
    C_Favre
    Altair Employee
    edited January 2022 Answer ✓

    Hi,

    I propose you to use the following python command (in Bold) in order to compute the efficiency.

    Firstly you can store in a pyhton variable the output and input power with the following command:

    Output_power=CurveVariation2D['OUTPUT_POWER'].y[0].meanValues[0]

    Input_power=CurveVariation2D['INPUT_POWER'].y[0].meanValues[0]

    After that create a python variable to store the efficiency:

    Efficiency=Output_power/Input_power

    Then you can then display the efficiency  in the output area using the python command:

    print 'Efficiency='+str(Efficiency)

    The value obtained can be stored in a I/O parameter using the python command

    VariationParameterFormula['EFFICIENCY'].formula=str(Efficiency)

    Please note that in thise case the parameter efficicncy already exist so it will just updated its value if you want to create it with a refernce value of 0 you can use the command:

    VariationParameterFormula(name='EFFICIENCY',
                              formula='0.0')

    I hope this helps.

    Best regards.

    Cyril Favre

Answers

  • C_Favre
    C_Favre
    Altair Employee
    edited January 2022 Answer ✓

    Hi,

    I propose you to use the following python command (in Bold) in order to compute the efficiency.

    Firstly you can store in a pyhton variable the output and input power with the following command:

    Output_power=CurveVariation2D['OUTPUT_POWER'].y[0].meanValues[0]

    Input_power=CurveVariation2D['INPUT_POWER'].y[0].meanValues[0]

    After that create a python variable to store the efficiency:

    Efficiency=Output_power/Input_power

    Then you can then display the efficiency  in the output area using the python command:

    print 'Efficiency='+str(Efficiency)

    The value obtained can be stored in a I/O parameter using the python command

    VariationParameterFormula['EFFICIENCY'].formula=str(Efficiency)

    Please note that in thise case the parameter efficicncy already exist so it will just updated its value if you want to create it with a refernce value of 0 you can use the command:

    VariationParameterFormula(name='EFFICIENCY',
                              formula='0.0')

    I hope this helps.

    Best regards.

    Cyril Favre

  • Alexandru-Ionel Constantin
    Alexandru-Ionel Constantin Altair Community Member
    edited January 2022

    Hi,

    Another way is to use a macro, Analyse2DCurve.PFM, which can be loaded in the Extensions/Macros in the Data Tree, and then run for any 2D curve to compute the integral, max, mean, min, rectified mean and RMS values. The values are saved as I/O parameters that can be used in calculations.

    Best regards,

    Alexandru

  • Frank_Mau_1
    Frank_Mau_1 Altair Community Member
    edited January 2022
    Cyril Favre_21925 said:

    Hi,

    I propose you to use the following python command (in Bold) in order to compute the efficiency.

    Firstly you can store in a pyhton variable the output and input power with the following command:

    Output_power=CurveVariation2D['OUTPUT_POWER'].y[0].meanValues[0]

    Input_power=CurveVariation2D['INPUT_POWER'].y[0].meanValues[0]

    After that create a python variable to store the efficiency:

    Efficiency=Output_power/Input_power

    Then you can then display the efficiency  in the output area using the python command:

    print 'Efficiency='+str(Efficiency)

    The value obtained can be stored in a I/O parameter using the python command

    VariationParameterFormula['EFFICIENCY'].formula=str(Efficiency)

    Please note that in thise case the parameter efficicncy already exist so it will just updated its value if you want to create it with a refernce value of 0 you can use the command:

    VariationParameterFormula(name='EFFICIENCY',
                              formula='0.0')

    I hope this helps.

    Best regards.

    Cyril Favre

    Thank you very much. You were faster than light with your answer ;-) 

  • Frank_Mau_1
    Frank_Mau_1 Altair Community Member
    edited January 2022
    Alexandru-Ionel Constantin said:

    Hi,

    Another way is to use a macro, Analyse2DCurve.PFM, which can be loaded in the Extensions/Macros in the Data Tree, and then run for any 2D curve to compute the integral, max, mean, min, rectified mean and RMS values. The values are saved as I/O parameters that can be used in calculations.

    Best regards,

    Alexandru

    Thank you very much. This is a great work around. If I analyze the python script I get also my solution.

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