Wireless Power Transfer of Daisy Chain Structure on Rotating Spindle

This paper presents a system for powering diagnostic sensors on a rotating spindle using wireless power transfer (WPT) based on electromagnetic coupled resonance. The rectifiers attached to the receiving coils are connected in a daisy chain structure and connected to a voltage regulator attached to the spindle. The receiving coils are installed on the spindle at an interval of about 30cm to reliably pick up the wireless power. RF rectifier was developed to supply the received power to the diagnostic sensor of the spindle. The transmitting coil is installed on an external support fixed next to the spindle. The resonant frequency of WPT is 13.56MHz. The WPT systems for diagnosing a rotating spindle has been applied to industrial sites.