Approximate Formulae for the Characteristic Values of Electrical Machines

Abstract In order to have a deep insight into the dynamics of the phenomena that occur in electrical machines the knowledge of the dependency of the modes on the parameters of the machine is required. In this note, approximate expressions are given for the characteristic values identifying the modes with reference to the case of machines equipped also with more than one winding system either on the stator or on the rotor. The results obtained allow a critical comparison with traditional formulae to be performed.