This work is deal with problems about PMSM. In the first part there is account working principle and design of PMSM. Below there is mathematic model of PMSM, which is used in calculation of behavior PMSM. The third part is deal with parameters influence on transient phenomenon, especially his starting and synchronization process. The last part observes parameters influence on the machine with help of simulator program PCSIM. There are four cases. The first case is Voltage Source Inverter applied to a PMSM, the second case is A Voltage Source Inverter controlled by a Pulse Width Modulation applied to a PMSM, third case is A Voltage Source Inverter with supply cable applied to a PMSM and the last case is Influence of quality of supplied electricity on the behaviour of PMSM