[Getdp] eddy current due to the rotation

[Blaise LAPOTRE]

Hello,

I want to include the eddy current due to the rotation of rotor in one active magnetic bearing in my simulation.

To find these currents I have chosen to modify the formulation in classical formulation
Curl(1/mu*curl(A))=-sigma*dA/dt+J_s
[cid:image005.png at 01D21296.2EC4CED0]

To take into account the rotation :
dA/dt= dA/dtheta*dtheta/dt
[cid:image006.png at 01D21296.2EC4CED0]


To integrate the derivative I use the curl and special tensor :

Omega=1000;
Angle[]=Atan2[$Y,$X];
r[]=Sqrt[$X^2+$Y^2];
Tchang[]=Tensor[0,0,0,0,0,0,r[]*Omega*Cos[Angle[]],r[]*Omega*Sin[Angle[]],0];

Galerkin{[-Sigma[]*Tchang[]*Dof{d a},{a}]; In Rotor; Jacobian JVol; Integration I1;}


My active magnetic bearing is symmetrical but when i change the direction of the rotation from 1000 to -1000 the result is different.

Can you explain why i have a different results ?

Sincerely,

Blaise LAPÔTRE

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