Hi, I'm a new user, sorry for my english. I need help in COMSOL 4.2 for making a rotating magnetic field.
This is the problem : I need to simulate a NDT (non destructive tesing) for search a defect in a metal square with eddy current. A 3 coil generate the magnetic filed trought the alternate current (sin(w*t) ). I'm not interested to simulate a entire coil and current, but only the magnetic filed (rotating).
I select AC/DC module, 2D, electric and magnetic filed (fem) and electric current (ec) sub-module. I make a 3 geometry, a first large square thath simulate the air; I selected material -> air. Then i make my geometry, 2 rectangle thath making a L figure. For this two figure I selected air and modified only the conductivity (0 for air, for this material I inserted the value 4.032e+6). I merge the 3 figure. I create the mesh with default value.
Now is the problem : Where I insert the module and the direction of magnetic filed? And how I can make this filed rotating? My idea is : insert a position of magnetic filed (x,y), the intensity and the direction (perpendicular to my geometry, so z component only) and then evalute the magnetic field on my geometry.
Thanks for help, and sorry for my bad english
EDIT : maybe I find wheere I should insert intensity and direction of field. In magnetic and electric filed-> ampere law -> equation I modified : mef.Bx=0, mef.By=0,mef.Bz=0.03 [T]. I simulate, but in entire geometry there are a uniforme magnetic filed of 0.03 T. The interaction of metallic geomtry don't applied.
This is the problem : I need to simulate a NDT (non destructive tesing) for search a defect in a metal square with eddy current. A 3 coil generate the magnetic filed trought the alternate current (sin(w*t) ). I'm not interested to simulate a entire coil and current, but only the magnetic filed (rotating).
I select AC/DC module, 2D, electric and magnetic filed (fem) and electric current (ec) sub-module. I make a 3 geometry, a first large square thath simulate the air; I selected material -> air. Then i make my geometry, 2 rectangle thath making a L figure. For this two figure I selected air and modified only the conductivity (0 for air, for this material I inserted the value 4.032e+6). I merge the 3 figure. I create the mesh with default value.
Now is the problem : Where I insert the module and the direction of magnetic filed? And how I can make this filed rotating? My idea is : insert a position of magnetic filed (x,y), the intensity and the direction (perpendicular to my geometry, so z component only) and then evalute the magnetic field on my geometry.
Thanks for help, and sorry for my bad english
EDIT : maybe I find wheere I should insert intensity and direction of field. In magnetic and electric filed-> ampere law -> equation I modified : mef.Bx=0, mef.By=0,mef.Bz=0.03 [T]. I simulate, but in entire geometry there are a uniforme magnetic filed of 0.03 T. The interaction of metallic geomtry don't applied.