Comparative Study of Different Coil Geometries for Wireless Power Transfer Using Finite Element Method

Basic principles of inductive coupling of power transfer is based on the mutual
inductance and coupling coefficient. This mechanism consists of the primary coil
which is the transmitter and the secondary coil which is the receiver. This two coils
will create the system of magnetic coupled inductors which generate the magnetic field
and induces voltage to the receiver through an air gap. The larger the air gap will
affected the performance of mutual inductance and coupling coefficient between
inductors. The coupling coefficient is the current in one coil that link to the secondary
coil which is the receiver with the fraction of the magnetic flux usually denoted by (k).
Mutual inductance is when the current at the receiver is changing due to its mutual
electromagnetic field. In addition, consideration of coil geometries also need to be
taken for calculating the mutual inductance. In this project, the coupling coefficient
between two coaxial coils will be analyse based on the air gap between the two
coupling coils using finite element analysis.