Negative loss imported into steady-state thermal
Bingjian
Member
Hi all,
I am a beginner of thermal analysis of induction machines. When I import load into steady-state thermal, I find some coil losses are negative which looks wrong. I am wondering why those losses are negative and how to fix it.
Then, I set 2 convections, one is the outer surface of the stator and another one is all edges of the air area. Ambient temperatures are both 22 degree, film coefficients are both 150 W/㎡·℃. After setting source end time of imported generation to 3000s, and also the analysis settings. Finally, I got a temperature plot which looks wrong, because the temperature is much lower than I thought. And another question is why the hotspots are always in same coils when I run the animation of temperature graph? Do you have any idea for the temperature plot?
Thanks in advance.
Kind regards,
Bing
Comments
Hi @Bingjian Can you try using linear mesh? Also in the thin bodies if the temperature gradient is high, you should have more number of elements in the thickness.
@rkumbhar Thank you very much. The problem is about thickness,
@rkumbhar Hi, I tried to set the thickness of this 2D model of motor, but some losses are still negative and they are still make negative temperature effects.
Hi all,
I set the thickness of this 2D model and made mesh much finer, but the losses are still negative and make negative influences on the temperature plot. I watched some tutorials where the motor losses are all positive. I am wondering why these losses in my model are negative and how to fix it. It is probably caused by some settings in EM but I am still geting stuck with it.
Any ideas are welcome.
Regards,
Bingjian
Dear all,
The problem is solved by changing motionsetup and analysis settings in EM.
Hello all, please I am interested on how you solved this issue cos I am currently facing the same problem. I saw where it is said that the problem will be solved by changing the motion setup and analysis settings. Please, can anyone explain this to me. Will the analysis be a parametric type? What exactly can be done to the analysis settings? I am really lost. Any help or suggestion is highly welcome
I have done all the instructions listed here but i am not yet satisfied with the temp results. I have attached the settings both in maxwell and ansys mechanical
my settings in maxwell are attached here
convection BC and generated imported heat
Hi @Bingjian I would encourage you help the peers with similar issue. Feel free to add your comment.
Good morning all.
I modeled my motor in maxwell, got the necessary losses. The analysis is on no load condition. I exported the model to Ansys for thermal analysis and applied a convective boundary condition on all the 68 edges of the model
. But temperature results i got from ansys isnt the true reflection of what i did in maxwell. The temperature variation is around 22 deg C which is wrong. Also, I couldnt see the imported loses(table) in ansys mechanical. I know something is wrong, please i need your help. i have attached series of images to further explain what i did both in ansys and maxwell. Thanks
Good morning all.
I modeled my motor in maxwell, got the necessary losses. The analysis is on no load condition. I exported the model to Ansys for thermal analysis and applied a convective boundary condition on all the 68 edges of the model
. But temperature results i got from ansys isnt the true reflection of what i did in maxwell. The temperature variation is around 22 deg C which is wrong. Also, I couldnt see the imported loses(table) in ansys mechanical. I know something is wrong, please i need your help. i have attached series of images to further explain what i did both in ansys and maxwell. Thanks