SENSORLESS FIELD ORIENTED CONTROL OF BRUSHLESS ...

e je ), and (2) it was demonstrated that only the quadrature component of current contributed
q
to torque production. Both of these features are seen clearly in the figure.
To further explore this model, return to the steady-state SV diagram in the rotor reference frame
(presented in Figure 3.43 and Figure 3.44). The diagrams were split to improve clarity while
introducing the d- and q- components. Now the electrical quantities will be combined and the
components will be ignored in order to focus on circuit operation. The steady-state SV diagram of
a BPMS motor in the rotor frame is shown in Figure 3.49.
Figure 3.49 – Steady-state SV diagram in rotor frame.
In examining Figure 3.49 it becomes clear that the cross-coupling terms in Figure 3.48 are due to
the inductances; the SV diagram and simulation diagram viewpoints are easily reconciled by
comparing the two figures.
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