Induction machine - Thermal Transient mode

GiovanniLogiodice
GiovanniLogiodice Altair Community Member

Hello everyone,

For induction motors, In thermal transient analysis, the losses imported from the working point power balance, specifically the stator and rotor joule losses, do they change with temperature variation or remain constant throughout the simulation ?

Thank you.

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Answers

  • fzidat
    fzidat
    Altair Employee

    Hello Giovanni;

    In the thermal test, the computation is on way, and the heat sources are the losses you imported.

    If you want to make the two way computation, then it is possible from the sine wave test, where you can specify one way or two ways.

    Regards

  • GiovanniLogiodice
    GiovanniLogiodice Altair Community Member

    Hi,

    Thank you for your reply. I have a question regarding the transient thermal mode. I would like to know if the losses imported from the working point - sine wave test (or imposed) change with the increased temperature during this mode, or if they remain constant.

    During the transient simulation, the temperature increases. Therefore, I believe that my winding and bar resistance should also increase. In addition, the stator joule losses and the rotor joule losses should increase proportionally to the temperature.

    To ensure accuracy in my simulation, should I insert the losses computed at ambient temperature or the losses computed at the thermal regime into the working point - sine wave test with the thermal solving mode with iterative process between electromagnetic and thermal computations till the convergency activated ?

    Thank you for your assistance.

    Best regards

  • fzidat
    fzidat
    Altair Employee
    edited January 21

    Hello Giovanni;

    You are welcome!

    Please find below my answers:

    1- I have a question regarding the transient thermal mode. I would like to know if the losses imported from the working point - sine wave test (or imposed) change with the increased temperature during this mode, or if they remain constant.

    ⇒ No, the losses remain constant and not dependent on the temperature if you import them. As indicated previously, you can make an U F N test with one way thermal coupling or two way thermal coupling.

    2- To ensure accuracy in my simulation, should I insert the losses computed at ambient temperature or the losses computed at the thermal regime into the working point - sine wave test with the thermal solving mode with iterative process between electromagnetic and thermal computations till the convergency activated ?

    ⇒ Please see answer on question 1

    Regards