What could be the possible reasons for negative torque in EESM machine?

- June 28, 2023 at 4:17 am
  
  Sree Ranjini
  Subscriber
  
  I am getting negative torque for EESM 3D simulation in Maxwell. How to rectify ?
- June 28, 2023 at 9:05 pm
  
  DELI
  Ansys Employee
  
  hi, could you provide more information of your machine? is this a synchronous machine?
- June 29, 2023 at 5:22 pm
  
  Viswanath Yenumula
  Subscriber
  
  Hello DELI,
  yes , we are using Externally excited synchronous machine(EESM). Initially, we simulate the model using- maxwell 2D. Now we are trying to compute same machine using 3D with same excitation patterm, same current values, same advance angle. in 2D i am getting positive torque, but in 3d i am getting negative torque for the same operating point condition
  - June 29, 2023 at 5:37 pm
    
    DELI
    Ansys Employee
    
    There might be some difference between 2D and 3D model, could you check the current direction, rotation direction and rotating axis?
- July 6, 2023 at 7:20 am
  
  Viswanath Yenumula
  Subscriber
  
  Hello Deli,
  Thanks for the reply. I have one more doubt. How to calculate the initial position angle of EESM. Is it similar to PMSM machine or different one

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