Calculation of inductance matrix without return conductor and with return

    • hujun peng


      I am using Eddy current solver to calculate the frequency-dependent impedance for electrical motors.

      I want to calculate the inductance of each conductor and their coupling. 

      At first I use one pole simulation as follows. 

      Then, I excite two neighboring conductors as follows:

      Then, the inductance matrix will be set as 

      I run the simulation at 20 kHz,

      I get the results as follows:

      However,  they values are too small.


      Then, I run the simulation for a pole pair, and the model is 

      For the excitation this time, I uses winding and coils. 

      the first coil 

      the second coil 

      Then, the inductance matrix is set:

      afte Simulation, the results are

      The results are much larger than the result in the first case. 

      However, I suppose a factor of 2 between them because a turn consists of two conductors. 


      Therefore, my question is, why there is such a large difference. Which is one is correct for my application, i believe that the second results are more true. 

      Thank you. 

    • Navya C
      Ansys Employee

      Hi hujun peng,

      In the second case, the resistance seems very high(4.5 Ohm) for just one turn. I feel, may be, the first case makes sense and there is something wrong with the second case.



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