Maxwell, HFSS or Q3D?

    • bamdadslr

      Hi all,


      I want to know the general differences between Ansys HFSS, Maxwell and Q3D extractor, meaning that what are the important parameters of the simulation model that determine the module to be used between these three? 


      Maxwell eddy current module: Full-wave

      Q3D: quasi-static

      HFSS: More accurate for frequencies more than 1MHz for a structure of 50 m in dimension.

    • 3Asif

      Hi Bamdadslr:

      You got it right. 

      Also it is application dependent. 

      Maxwell: motor simulation, electromagnetic force from coils, wireless power transfer (wireless charging). It captures Eddy currents.

      Q3D: Low frequency situations where the EM equations are not 'tight'. If you are looking for DC values, Q3D is good.  Also, it can do something for capacitance calculation (capacitive touch screen). 
      Rule of thumb states that the structure should not be electrically larger (more than 1/10th lambda). If your frequency is low, you get reliable result in larger conductor. If your frequency is higher, your structure should be smaller accordingly.

      HFSS: All things high frequency. 
      HFSS can use Q3D solver (if Q3D solver license is available) to simulate DC points and combine it with higher frequency results.


    • bamdadslr

      Dear 3Asif,


      Thank you so much for the information, that solved my problem.

    • bamdadslr

      I read in one of the Ansys documents about Eddy current module of Maxwell saying that it is a full-wave solver (considering the PDE it is solving). So can we conclude that the rule of thumb for the accuracy of quasi static simulations (Electrical dimensions of the model not more than 1/10th lambda) does NOT need to be satisfied in the eddy current module to have accurate results? (I mean can the structure be bigger than 1/10th lambda?)

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