an investigation of dual stator winding induction machines

In section 10.2, the fundamentals of vector control and indirect rotor flux orientation
control are introduced based on the induction machine dynamic model. Then the
derivation of the indirect rotor flux orientation control scheme is presented in section
10.3. The design methods for current controllers, flux controller and speed controller are
discussed in section 10.4. In section 10.5, computer simulation results of indirect rotor
flux orientation control of the dual stator winding induction machine are shown. Full-
order flux observer design and determination of observer gains are the topics of section
10.6 and 10.7 respectively. The sensorless control scheme uses a flux observer and a
speed estimator instead of the encoder. The methodology for properly choosing the
observer gains is presented in section 10.7. A brief introduction of D-decomposition
method is given in section 10.8. Controller design methods for the speed estimator is the
topic of section 10.9. The speed controller design method is described in section 10.10.
Finally, the simulation results for sensorless control are given in section 10.11 and
conclusions can be found in section 10.12.
10.2 Indirect Flux Orientation Control
The original idea of vector control for induction machines comes from the model of
dc machines. In the dc machine, the electromagnetic torque results from the interaction
between excitation field and armature current, which can be controlled independently.
The excitation field is the result of field current or a permanent magnet. The torque
equation of dc machines is given as:
P
Te = λaf
ia
(10.1)
2
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