Research on Simultaneous Wireless Power and Data Transfer With Separated Channel Design for Contactless Slip Rings

Contactless slip rings often require relative rotation between primary and secondary coils due to operational demands in industrial applications. Theoretical and experimental studies reveal that rotational misalignment induces mutual inductance fluctuations, consequently degrading system output characteristics. This paper proposes a rotation-tolerant contactless slip ring system based on simultaneous wireless power and data transfer (SWPDT) technology. An optimized coupling mechanism featuring a rotation-insensitive coil design is developed to maintain stable mutual inductance during rotation, while orthogonal magnetic field decoupling between power and data transfer channels is achieved through directional current configuration in respective coil branches. For circuit topology, the power transfer loop employs an LCC-S compensated network, whereas the data loop adopts an S-S topology, with parameter optimization ensuring robust output performance under rotational misalignment. A 360-W experimental prototype is constructed for validation. Test results demonstrate stable 60-V constant voltage output with less than 2.33% fluctuation throughout 360° rotation, peak transfer efficiency of 88.9% maintained within 2.5% variation, and reliable 19.2-kbps data transfer, confirming the system’s stable operation under continuous rotation conditions.