Learning Forum

[Johnny_Monorail]

[NKC]

Hi @Johnny_Monorail You need to make sure of two things.
Magnet should have defined non-zero conductivity in the Material properties.
Under Maxwell 3D>Design settings. The insulator value should be less than the conductivity defined in the Magnet Material properties.
Then it will show up in the eddy effect settings.
Regards Navya

[Johnny_Monorail]

Thanks a lot !
The solution works great. And I'm able to plot the eddy losses for rare-earth magnets. What about ferrite magnets though? Maxwell shows a default conductivity of 0 S/m (for grade 'Y30'). I understand ferrite material is supposed to have very low eddy loss, but 0 S/m seems a bit far-fetched. Any comments?

[NKC]

@Johnny_Monorail If you have manufacturer data for the Y30. You can always clone and edit the materials in Maxwell library.
Eidt and use the material if you know a more accurate value.
Regards Navya

[John Mushenya]

@Navya C I have two questions related to eddy losses in permanent magnet rotors:

 

1. Is there a way to model permanent magnets with a very thin coating of another conductive material, say Nickel, in Ansys Maxwell 2D and 3D transient simulations?
2. For a motor model such as the one shown below, in which Nickel coated spoke-type permanent magnets make contact with the exposed (non-insulated) cut-edge of the steel laminations (highlighted in orange), what is the best way to model these conductive surfaces in ansys maxwell? I believe the conductive magnets are in a way short-circuiting the steel laminations and I have proved this experimentally. Will Ansys Maxwell accurately capture the eddy-current losses in the magnets and steel if I simply set the steel composition as “lamination?” Please advise.