Learning Forum

[hani.sadek_i]

Hello,

When I plot the torque-speed characteristics for a certain motor that I am designing I am getting the curve below.

I don't know why I am getting that dip in the middle of the plot. I tried changing the increment and I still got that dip at a different location. Is that an error with my design or an error with the software itself ?

[HDLI]

Hello Hanisadek Could you share the setting on Model build and Calculation tabs in lab model?
In E-magnetic model, could you change to "FEA" in "Saturation Model" in Calculation? If it is an induction motor. Thanks.

[hani.sadek_i]

Hello,
here they are:


I always use FEA for the calculation of the saturation model (since results will be more accurate)
I am trying to replicate the design found in a paper to test the software and see if I can get the same results.
I am getting similar results for the steady-state operation, but not the same torque-speed curve for the flux weakening region.
your help will be highly appreciated! thank you

[HDLI]

Hello,
This issue could be caused by the solver failing to converge. Please review the manual and search "im slip" to find "Lab Problem ÔÇô IM Efficiency Map" page as below.
Please change initial slip to 0.07 in "setting" in the lab model to solve the issue.
Thanks.
HDLI

[hani.sadek_i]

Thank you !
That was very helpful!

[David_W]

If I just look at the figure, the value is zero. It seems that the calculation is not solved. May I ask how did you solve this problem at the end? Thanks.