We developed a prototype of Fibre Bragg Grating (FBG) thermal sensor system and deployed it in a real-time radial thermal profiling of electric machine (EM) copper windings. Two EM duty type regimes were simulated using an experimental EM motorette framework. The thermal tests were performed using an experimental setup consisting of an FBG interrogator, FBG temperature sensors, a motorette frame with embedded windings, and a power supply. We constructed a lumped parameter thermal network (LPTN) model of the motorette and used it for the analysis of FBG measurement and compared them with the model results for performance validation. The comparison of experimental FBG measurements with the LPTN model results show a good agreement - all results were within the range of expected experimental error. The results suggest that our FBG sensor system can be used for thermal monitoring of multiple duty types of EM windings. The system achieved sensing spatial resolution of 8 mm, the maximum sensing frequency of 1kHz, and stable linear temperature sensitivity of 0.091 °C/pm.