different results from 2D and 3D simulation

- February 15, 2021 at 12:19 pm
  
  M_reda
  Subscriber
- February 16, 2021 at 2:30 am
  
  Navya C
  Ansys Employee
  
  Hi @M_reda
  The assumption when using 2D cross-section to represent a 3D model is that the fields are evenly distributed along the axial direction. This assumption is reasonable when the stack length of the machine is long enough such that the end effect of 3D model can be neglected. However, if your machine has a short stack length the assumption does not match the actual model well so you will get that amount of difference. You will see the difference drops as the stack length increases.
  The difference between 3D and 2D model are mainly the end winding effect and the fringe effect in stator/rotor cores. If you have a short stack length it is likely that the difference can not be ignored. The difference is the result of the base assumption of 2D rather than the result of your settings.
  So I would suggest just use 2D simulation for rough calculation and use 3D for fine-tuning
  For your second Question: Select 3D model design, and in the properties window make half Axial value to zero, to get a full machine model in 3D.
  
  Regards
  Navya
- February 17, 2021 at 1:31 pm
  
  M_reda
  Subscriber
  
  Thanks Mr nchode your answer really helped me a lot.

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