Calculation and comparison of electromechanical characteristics for SynRM and PMSynRM of the same frame size

This paper deals with comparison of electromechanical characteristics of SynRM and PMSynRM of the same mechanical size. First the constructions of SynRM and PMSynRM are described shortly. Then the field circuit method of PMSM parameters calculation, known as a loading method [3] divide [5], is described. This method after same changes has been used for calculation of electromechanical characteristics presented in the paper. It is shown, that inserting of permanent magnets into the rotor of a common SynRM results in a significant improvement of motor performance. Especially the maximal value of synchronous torque T_S.max can be two times higher in the PMSynRM, still having better power factor and efficiency. It is shown that electromechanical characteristics cosphi=f(P_m) and eta=f(P_m) of PMSynRM are better for the all range of loads comparing to SynRM.