Demonstration of multiple orbit jumps in nonlinear dual-mode electrodynamic receiver for wireless power transfer

• Dual-mode receiver operates under both weak and strong magnetic fields. • High power density is achieved without cold-start limitations. • Orbit-jump strategy enables transitions to high-energy states. • Subharmonic orbit-jumps accelerate access to these states. • Experimental results and a nonlinear model validate the concept. This paper introduces a rotating-magnet based electrodynamic receiver for low-frequency wireless power transfer, capable of operating in two distinct modes: an oscillating mode and a continuous rotation mode. This dual-mode capability, never demonstrated previously in similar systems, enables seamless adaptation to a wide range of input magnetic field characteristics, addressing limitations of existing systems. An analytical model is developed to characterize the system’s behavior and predict its performance. Based on this model, an orbit jump strategy to force the transition between modes has been developed, simulated, and experimentally validated. Experimental validation shows that the receiver, within a bounding box of 810 mm3, achieves 16.7 mW at 135 Hz in continuous rotation mode and 4.4 mW at 47 Hz under a 1 mT field in oscillating mode.