A Three-Phase Rotating Magnet Electrodynamic Wireless Power Transmission Receiver

This paper presents a highly efficient synchronously rotating three-phase electrodynamic wireless power transmission (EWPT) receiver that operates at frequencies below 1 kHz and transmission distances up to 30 cm. The 53 cm
³
rotating magnet receiver demonstrates 10 W at 10 cm with an efficiency of 72% and 975 mW at 30 cm with 7.6% efficiency. The latter result corresponds to a normalized power density of 247 mW/cm
³
/mT
²
at 30 cm, 40% more than the highest previous reported value. The wireless power transfer (WPT) efficiencies and normalized power densities are the highest reported for an EWPT receiver using a coil-based transmitter.