The stray capacitance that occurs in the coil depends on its geometry. To obtain the stray capacitance that occurs in various types of coils, a magnetic analysis using FEM is effective. By modeling the entire coil, stray capacitance accounting for the distance between windings and differences in winding pattern can be obtained.
This document introduces target on the helical coil, changes the distance between windings, and obtains stray capacitance that occurs in each coil.
Electric potential distribution, Current density distribution
Each electric potential (intensity) distribution of when electric potential of 1(V) is supplied between terminals of the coil with coil distance of 1.5 (mm) is shown in Fig.1, and current density distribution (intensity) is shown in Fig.2. It can be confirmed that the electric potential distribution inside the coil is solved from the supplied electric potential boundary condition (amplitude: 1V, 0V). It can be confirmed that current flowing in the coil depending on the electric potential difference is solved, and current density distribution is obtained.