Estimation of Torque vs Speed curve of motors

[carno44]

HI All,

I am trying to calculate the Torque Vs Speed plot of a IPMSM motor. I started with the Pyleecan tutorials. The no-8 tutorial (Multi simulations) is for the variable speed calculations. I took that as a starting point and modified for variable speed. (The tutorial uses single speed for all the simulations). The reason could be the results are independent of speed or if you vary the input speed the results do not change. I guess this is because back-emf effects are not taken into account and currents are taken as inputs. In my understanding the current is the result of supply voltage and back-emf. I have done the following modifications in the code.

# Added a function to get peak emf
def fun_emf(output):
output.mag.comp_emf()
return max(abs(output.mag.emf.values[:,0]))

emf_dk = DataKeeper(
name="Stator Winding Electromotive Force",
symbol="EMF",
unit="V",
keeper=fun_emf,
)

Above lines helped me to plot the Speed vs emf plots. Pyleecan also gives emag torque values for each speed. I understand that the values are without back emf effects, as I tested, the values do not change with speed. Now I am stuck. How to update the torque values for emf effects. In my thinking, we need to modify the input current equation as function of (supply voltage - back-emf). How to do that?

Another thing, am I reinventing the wheel? It is almost impossible that, Pyleecan has not done it before. I am not able to find the way.

Thanks in advance.

Best regards,
Carno

[carno44]

Has Anyone found the way, how to plot Torque vs Speed curve for motor?

[carno44]

I managed to plot this. For those who want to do the same thing.

I used following script to do it. On the link it is explained pretty well.

https://github.com/Eomys/pyleecan/blob/master/Tutorials/tuto_Efficiency_map.ipynb