## General

#### How do I calculate inductance and resistance of a coil in post-processing phase?

• FAQ
Participant

In case you have forgotten to assign the Matrix-parameter before the simulation, you can also calculate inductance and resistance after the simulation. To calculate inductance of a coil in the post-processing phase: 1) Go to â€˜Maxwell 3D -> Results -> Solution Dataâ€™. On the convergence tab, note the â€˜TotalEnergy (J)â€™ of the last pass, and calculate the inductance with the formula L=4*TotalEnergy/I_peak^2, where I_peak is the peak current of your coil OR 2) In the Fields Calculator, integrate the â€˜energyâ€™ over the volume â€˜AllObjectsâ€™ to get the â€˜TotalEnergyâ€™, and calculate the inductance with the abovementioned formula. To calculate resistance of a coil in the post-processing phase: In the Fields Calculator, integrate the â€˜Ohmic-Lossâ€™ over the volume of your coil to get â€˜P_ohmicâ€™, and calculate the resistance with the formula R=2*P_ohmic/I_peak^2 Details about the formulas can be found in Maxwell-help: Maxwell 2D Technical Notes -> Eddy Current Field Simulation -> Impedance Matrix -> Computing an Impedance Matrix -> Matrix Resistance/Inductance.