SENSORLESS FIELD ORIENTED CONTROL OF BRUSHLESS ...

Figure 2.33 – Torque control of trapezoidal BPMS motor. ...........................................................58
Figure 2.34 – Torque control of sinusoidal BPMS motor..............................................................59
Figure 3.1 – Stator of three-phase sinusoidal synchronous machine. ............................................63
Figure 3.2 – Three phase wye-connected stator with three phase terminals..................................64
Figure 3.3 – Developed view showing sinusoidal stator MMF distribution..................................65
Figure 3.4 – Developed view showing superimposed MMF distributions of all phases. ..............66
Figure 3.5 – Stator MMF distribution of phase-A at various electrical positions in time. ............67
Figure 3.6 – One electrical cycle of unit-amplitude, balanced sinusoidal general quantities. .......68
Figure 3.7 – Developed view at zero electrical degrees.................................................................69
Figure 3.8 – Developed view at thirty electrical degrees...............................................................70
Figure 3.9 – Developed view showing stator MMF waves of Figure 3.7 and Figure 3.8..............71
Figure 3.10 – Observing MMF value at fixed position..................................................................73
Figure 3.11 – Instantaneous values of component and total MMFs; (c.f. Figure 3.7, Figure 3.8). 74
Figure 3.12 – Simplified developed view of a four pole motor. ....................................................76
Figure 3.13 – Developed view of two pole motor showing rotor flux density. .............................78
Figure 3.14 – Cross section of two pole motor. .............................................................................79
Figure 3.15 – Developed view showing rotor flux density and stator MMF.................................79
Figure 3.16 – Single-phase equivalent circuit................................................................................84
Figure 3.17 – Time phasor diagram of phase-A. ...........................................................................84
Figure 3.18 – Positive sequence phasor orientation.......................................................................84
Figure 3.19 – Time relationship between flux linkage due to rotor and bEMF.............................86
Figure 3.20 – Time relationship between phase current and stator-produced magnetic quantities.
...............................................................................................................................................86
Figure 3.21 – Time relationship between phase-A current and stator self flux linkage. ...............87
Figure 3.22 – Time relationships between electrical and magnetic quantities...............................87
Figure 3.23 – Time relationships between flux linkages and induced voltages; lagging PF. ........88
Figure 3.24 – Equivalent force produced by plates aligned with resultant force...........................96
Figure 3.25 – Instantaneous values of component and total MMF space vectors; (c.f. Figure 3.11).
.............................................................................................................................................100
Figure 3.26 – Addition of component MMF SVs to form total MMF SV (c.f. Figure 3.25). .....101
Figure 3.27 – Equivalent MMF produced by coil with axis aligned with resultant MMF (c.f.
Figure 3.24). ........................................................................................................................103
Figure 3.28 – Axis of rotating amp-turn distribution cophasal with current and MMF SVs.......114
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