Wireless power transfer system for diagnostic sensor on rotating spindle

This paper presents a system that supplies power to a rotating spindle's diagnostic sensor using wireless power transfer technology based on electromagnetic coupled resonance and gauges strain experienced by the spindle. In order to transfer power to the spindle's sensor through the wireless power system, we attached power receiving coils to the spindle at 120 degree intervals and fixed the power transmitting coils to the ground at 60 degree intervals. We used a resonance frequency of 14.32MHz for wireless power transfer; and an interval of 30cm was maintained between the transmitting and receiving coils. The wireless power transfer system to diagnose a rotating spindle was applied at an industrial site, and demonstrated its applicability.