Wireless Power Transfer Using A Halbach Array and A Magnetically Plucked Piezoelectric Transducer for Medical Implants

A wireless magnetic power transfer methodology for self-powered medical implants is proposed using a piezoelectric receiver along with the implant and a near-field magnetic transmitter as a wearable device. The transmitter includes a rotating magnetic Halbach array driven by a motor or human motion, capable of increasing the transmission distance to an implanted receiver by offering stronger magnetic coupling compared to a normal magnetic array. Transduction is achieved by utilising low frequency rotating magnetic fields to periodically excite a cantilevered piezoelectric beam (receiver). Simulations are carried out to examine the Halbach array performance. The established wireless power link delivers sufficient power (~0.28 mW) over relatively large transmission distances (18 mm) compared to existing techniques, demonstrating its potential for further miniaturization and self-sustained biosensing applications.