Comparative Analysis of Square and Spiral Coils for Efficient Inductive Wireless Power Transfer
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Keywords:
Wireless Energy Transfer, Inductive Coupling, Wireless Power Transfer, Ansys Maxwell 3D Simulation, Square Coil, Spiral 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. For the
square coil, the simulation results demonstrated a consistent self-inductance and a varying coupling
coefficient depending on the distance between the coils. As the separation distance increased, the mutual
inductance and coupling coefficient values decreased, confirming the distance-sensitive nature of inductive
coupling. The spiral coil, formed by side-by-side winding of copper tubing, showed the highest efficiency
in magnetic field distribution and inductive characteristics. Visual representations revealed that the
magnetic field intensity was most concentrated near the inner diameter of the spiral coil due to the denser
turn count and reduced inter-turn spacing. These findings suggest that geometric parameters significantly
influence coil efficiency and coupling behavior in inductive wireless power systems. The study offers
practical insights into coil design optimization for improved power transfer efficiency and system reliability
in real-world applications.
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