Machine performance for given maximum line current and maximum line-to-line voltage

Melih Ayyildiz_22506
Melih Ayyildiz_22506 Altair Community Member
edited March 1 in Community Q&A

Hello,

I want to design an electric motor for the use inside an electric vehicle. The motor can only be run at a maximum line current and maximum line-to-line voltage.

Within FluxMotor I could run the Efficiency map test and define the maximum electric values as input parameters. At the end, I got the machine performance. Right now I am mostly interested in the base point.

For a deeper understanding of the motor I used the the workingpoint - sine wave test with the accurate mode since it will calculate the machine performance with the help of a FEM Flux Model. For this, I have to define different input parameters.

For the workingpoint test I have to define the following input values

  • maximum line current
  • control angle
  • speed

I used the data given from the efficiency map test calculation for this test. The data was according to the base point. The thermal conditions were same for each test. At the end of the working point test, I could see that the line-to-line voltage is now exceeding my initial line-to-line voltage which is given for the performance mapping test.

My questions:

  • Which test accurately give me information about the base point performance for a maximum line current and line-to-line voltage? Is it the data sheet test?
  • Why is the line-to-line voltage different between the performance mapping test and working point test?
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Answers

  • Letizia_Ferrara
    Letizia_Ferrara
    Altair Employee
    edited March 1

    Hello Melih,

    Yes normally the test is the Datasheet, you can find more information at this page:

    https://help.altair.com/fluxmotor/topics/4042-DatasheetMotorIU.htm

    How big the difference you found between the performance mapping and the working point? Are the parameters you used the same?

    It may normally depend on the settings used in the work point test, as some additional options are available there like the computation of the AC losses and the first option "Computation mode"; to have accurate results you have to set as "Accurate" this option and consider the AC losses.

    Also in the performance mapping you can add the user working point that ensure you that the computation is done in that specific point and the results are not extrapolated to build the maps.

    Best regards,

    Letizia

  • Melih Ayyildiz_22506
    Melih Ayyildiz_22506 Altair Community Member
    edited March 1
    Letizia Ferrara_21767 said:

    Hello Melih,

    Yes normally the test is the Datasheet, you can find more information at this page:

    https://help.altair.com/fluxmotor/topics/4042-DatasheetMotorIU.htm

    How big the difference you found between the performance mapping and the working point? Are the parameters you used the same?

    It may normally depend on the settings used in the work point test, as some additional options are available there like the computation of the AC losses and the first option "Computation mode"; to have accurate results you have to set as "Accurate" this option and consider the AC losses.

    Also in the performance mapping you can add the user working point that ensure you that the computation is done in that specific point and the results are not extrapolated to build the maps.

    Best regards,

    Letizia

    Hi Letizia,

    the voltage difference lies somewhere near 10% of the initial rated max. L-L voltage. It seems quite high to me. The parameters (thermal,mechanical) were the same. And during the working point analysis, the accurate mode with AC losses for all phases were enabled.

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