A Multipolarity-Coupling Composite Design for Enhancing Lateral and Rotational Misalignment Tolerance of Long-Track DWPT Systems

Lateral misalignment accompanied with rotational angle is unavoidable in the long-track dynamic wireless power transfer (DWPT) system. This results in an undesirable degradation in transmission performance. To address this vexing misalignment issue, a receiver (Rx) side topology based on multipolarity-coupling composite design is proposed in this article. The designed Rx composite assembly, consisting of a circular coil and three rectangular solenoid coils, effectively catches both vertical and horizontal magnetic fields, complementing each other to suppress mutual inductance variation during misalignment. Only two design variables are included for parameter optimization process, which features simple design flow and convenient implementation without resorting to changing the existing ground assembly configuration. Efficiency stability enhancement is unveiled through power loss analyses combined with theoretical calculation. A scaled-down long-track DWPT system with nearly 320 W output power is built as an example to validate the proposed design. The experimental results show that the system dc–dc efficiency variations remain below 10% with a 40 mm lateral misalignment (53% of the transmitter track width) across a full deflection angle range of [−90°, 90°].