The paper objective is the determination of dynamic characteristics of a permanent-magnet synchronous machine (PMSM). A dynamic d, q model of the PMSM elaborated in the circuit theory is used. On this basis, there is made a comparative detailed analysis of the dynamic processes for the asynchronous starting of a PMSM and of a correspondent induction motor (IM). The study offers, with high precision, qualitative and quantitative information regarding electrical, magnetic and mechanical stresses, useful in the design stage of a PMSM, which are difficult or almost impossible to be obtained other way. The simulations can be also valorized for the pre-determination of the behaviour of a given PMSM, in a particular dynamic operation.

Keywords: Permanent magnet synchronous motor (PMSM), Transients, Modelling, Simulation