variable capacitor FEA finite element analysis, electric field in the variable capacitor
Variable air capacitor consists of fixed stator plates and movable rotor. Capacitance between the stator plates depends on the position of the rotor.
Problem Type: electrostatics.
Geometry: 3D extrusion.
Relative permittivity of air ε = 1,
Potential difference ΔU = 1000 V
Find the mutual capacitance between two stators as a function of the rotor position.
QuickField simulation gives energy W and electric potential U distribution. The capacitance then can be calculated as C = 2W / ΔU².
|Rotating angle α||Energy W||Capacitance C|
|0°||1.29 uJ||2.58 pC|
|30°||2.25 uJ||4.50 pC|
|60°||2.97 uJ||5.94 pC|
|90°||3.22 uJ||6.44 pC|