Research on a high-accuracy dynamic test method of the rotor temperature field of an explosion-proof motor

To achieve high-accuracy dynamic rotor temperature measurement of an explosion-proof motor during operation, a novel measurement method with a new-type FBG (Fiber Bragg Grating) sensor, is proposed in this paper. First, a new kind of FBG temperature sensors which could be employed in the narrow and small spaces of a motor�s air-gap with microsize sealing was developed. Experiments have shown that the designed sensor has a linearity of 0.999, and a repeatability of greater than 274.5 K within the range of 323 K�443 K. Second, a rotor temperature test system with designed sensor was built; the test results showed that the error between the test results and simulation results was less than 8%, which verified the feasibility and validity of the presented method. Furthermore, introducing an all-optical signal into the motor�s measurement field, this method was characterized by good fitness, immunity to electromagnetic interference, good explosion-proof performance, high accuracy, dynamic measurement, etc. Therefore, this method could be widely applied to the motor measurement field.