High temperatures are considered one of the biggest threats to motor and generator life cycle.
In induction motors and generators, winding insulation is greatly damaged if temperatures are higher than rated values. In permanent magnets however, high temperatures will demagnetize the magnets to never recover this characteristic any more even after temperatures get back to lower values.
How it works
Wireless and battery-free temperature sensors are located in hot spots in the rotor. Reader antennas are set up in the stator in a configuration that allows the RFID system to continuously monitor the temperature of all tags embedded into the rotor.
By transmitting temperature data over the RFID system and processing this data, engineers and maintenance staff members can have a real time thermal image of the rotor. Moreover, by storing all data in a database, specific trends can be spotted using historical data and design preventive and automated actions based on that data. This will prevent rotor temperatures to go above recommended values.