Wirelessly powered motor operation in dynamic scenarios using non-Hermitian parity-time symmetry

Abstract Motors arise as a heart of the mobility society, and wirelessly operated motors may improve our standard of living. Wireless power transfer in the kilohertz and megahertz range has been extensively explored, finding various potential applications in consumer electronics, electric vehicles, and medical implantations. However, most of the experimental works on such wireless power transfer have only considered static loads. Wirelessly powered motors would fail to continuously operate in dynamic scenarios, e.g., the rotating speed of the motors is varied. Here, we theoretically and experimentally demonstrate the operation of a motor, where the power is wirelessly transferred to via coils, is robust against the rotating speed by employing the analogy with non-Hermitian parity-time (PT) symmetry. In addition, our system is robust for misalignment of the coils. Our results open up opportunities of robust operation of motors via wireless power transfer in dynamic scenarios towards autonomous vehicles.