Learning Forum

[Bingjian]

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

[Rahul Kumbhar]

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.n

[Bingjian]

Thank you very much. The problem is about thickness, n

[Bingjian]

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.n

[Bingjian]

Hi all, nI 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.nnAny ideas are welcome.nnRegards,nBingjia

[Bingjian]

Dear all,nThe problem is solved by changing motionsetup and analysis settings in EM.n

[Bingjian]

n

[Bingjian]

n

[Emmanuel001]

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 welcomen

[NuelWeta]

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 mechanicalnn

[NuelWeta]

my settings in maxwell are attached herenn

[NuelWeta]

convection BC and generated imported heatnn

[Rahul Kumbhar]

I would encourage you help the peers with similar issue. Feel free to add your comment.n

[NuelWeta]

Good morning all.nI 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 modelnnnnnnnnnnnnn. 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. Thanksnnn

[NuelWeta]

Good morning all.nI 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 modelnnnnnnnnnnnnn. 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. Thanksnnn