Application of ball bearing cage RF temperature sensor in high speed turbocharger

The application of a radio frequency ball bearing cage temperature telemeter in a high speed turbocharger is demonstrated. A temperature dependent LC tank circuit is adhered to the bearing cage and wirelessly monitored using an axially displaced stationary receiver coil. The cage sensor is installed in a turbocharger rotor-bearing system and is able to withstand the harsh conditions of being tested at speeds up to 77,000 r/min. The sensor tracks the transient temperature response within the bearing due to mechanical losses and external heating. This sensor concept may be utilized to monitor bearing performance at high speeds, detect loss of lubricant and impending failure, and implement predictive analytics using measured data.