Method and internal temperature determination system of a synchronous electrical machine to the state observers means

The invention relates to a method for determining the temperature (2) internal (temperatures of the coils and the magnet) of a synchronous electrical machine (4) by means of state observers of the coil resistance and the magnetic flux the magnet. The invention further relates to a diagnostic method, a method and a control system (3) of a synchronous electrical machine from determined internal temperatures.