
297Electric Machine and Electric Drive Simulation
certain extent, the resonance conditions can be diminished by a decrease in the com-
mutation frequency. So, for example, when F
c
= 800 Hz, THD decreases from 54%
to 24% (Figures 5.120d and 5.121d).
5.3.6 siMplifieD sM MoDel
The previously described SM model is rather complex and can demand much time dur-
ing simulation of the forked circuits with many SM. So a simplied SM model is included
in the folder Machines of SimPowerSystems. In this case, a round-rotor SM with equal-
axes inductances is modeled, the damper windings are excluded, and the stator circuit
consists of the stator resistance and ...