SENSORLESS FIELD ORIENTED CONTROL OF BRUSHLESS ...

The four winding-rotor combinations studied are shown in Figure C.18. Keeping with the
directionality used in Figure C.1, Figure C.18 shows the rotor flux interacting with the winding
function (which is “represented” by the MMF) to produce the rotor-stator flux linkage for each
winding-rotor combination. Since there is a one-to-one relationship between the winding and its
MMF, the MMF can be used to graphically depict the “effect” of the winding rather than its
physical distribution.
Figure C.18 – Summary of MMF and rotor-stator flux linkage results.
Figure C.18 simply summarizes the qualitative observations so far, but a quantitative look is
required to gain a complete understanding. Figure C.19 shows the amplitudes of the components
of Figure C.18. Some shorthand notation is used:
1
1 represents
3
1
1cos( r) cos(3 r)
(the Fourier series of a squarewave); any single digit is thus
3
associated with the fundamental cos( r ) ; and only the numerical portion of the amplitude is
shown because the parameter constants are always the same ( NDY Bp).
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