There has been followed the effect of the two excitation systems upon the dynamic stability of synchronous machine. The dynamic electromagnetic torques, the electrical angular speeds of the main rotating field, and that of the rotor are simulated in detail; the dynamic magnetic stresses are also specified. By simulation, the currents of all the machine windings can be determined, so on this basis, all the electromagnetic and mechanical stresses are specified. The qualitative and quantitative results are useful both in the design stage of synchronous machine and in the industrial practice.

Keywords: Permanent magnet, Synchronous motor, Transients, Modeling, Simulation