Method for measuring temperature of rotor of brushless exciting generator

The invention provides a method for measuring the temperature of a rotor of a brushless exciting generator. The method is characterized by comprising the following steps of: evaluating the actual current value If of the rotor first; then evaluating the resistance value Rf of a winding of a thermal rotor of the generator by using an interpolation method; evaluating the voltage value Uf of the rotor according to the resistance value Rf of the winding of the thermal rotor of the generator; calculating the temperature value Tf of the thermal rotor of the generator; then modifying the obtained values above by using the boundary conditions of the generator; finally, displaying the modified values. The method for measuring the temperature of the rotor of the brushless exciting generator based on calculation, which is provided by the invention, solves the problem that the current and voltage of the rotor of the brushless rotary exciting generator are difficult to measure, and additional devices including coils for measuring current and slip rings for measuring the voltage of the rotor are not required, so that the operating failure rate of the generator can be reduced, the reliability of the normal operation of the generator is improved, and the daily maintenance and repair burden is reduced.