About the PM motor applied three-phase sinusoidal
voltage of 500 Hz and 1.4 V, the estimation results are shown
in Fig. 5 and Fig. 6. Fig. 5 shows the vector locus of the
stator winding current. This is drawn by observing the
process of change of the stator self-inductance shown in
Fig. 4. According to the rotor position, the center of gravity
of the vector locus is moved in the d-axis direction and
extended. It is observed that the vector locus with
movement of the rotor position is moved. Fig. 6 shows the