Enhanced Performance in Inductive Wireless Energy Transfer Systems: A Study of Helical and Tubular Coils Configurations
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Keywords:
Wireless Energy Transfer, Inductive Coupling, Wireless Power Transfer, Ansys Maxwell 3D Simulation, Helical Coil, Tubular CoilAbstract
This paper presents the simulation and comparative analysis of different coil geometries used in
wireless power transfer systems, focusing on square and spiral coil configurations. Using the Ansys
Maxwell 3D simulation environment, key electromagnetic parameters such as self-inductance, mutual
inductance, and coupling coefficients were calculated to evaluate the performance of each design. This
study examines two coil geometries' inductive and magnetic coupling characteristics—helical and
tubular—across different separation lengths. Inductance and coupling coefficient values were derived via
simulations using self- and mutual-inductance matrices. The helical coil demonstrated a coupling
coefficient of around 0.086 and an inductance of 83.4 µH at a spacing of 135 mm. The self-inductance
values of the tubular coil exhibited slight fluctuation with distance, affirming that self-inductance is
primarily independent of coil separation. Conversely, mutual inductance and coupling coefficients
markedly decreased as the inter-coil distance rose, with the tubular coil's coupling coefficient declining
from 0.276 at 50 mm to 0.038 at 200 mm. These findings validate the susceptibility of magnetic coupling
to coil configuration and separation, offering valuable insights for wireless power transmission and
magnetic sensing applications.
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