POLITECHNIKA WARSZAWSKA

7. Simulation and experimental results
7.3. Steady state behaviour
The simulation and experimental results obtained in steady state for the system
described in the previous chapter are presented in Fig. 7.3-Fig. 7.20.
The first part of these graphs (Fig. 7.3.-Fig. 7.11) corresponds to the system
with measured speed taken to the feedback and coordinate transformation. These
investigations have been performed to show the behaviour of the FOC system,
without influence of the speed estimation. In these graphs estimated speed, stator
phase current, rotor flux component and electromagnetic torque are shown, for
different values of the mechanical speed and load torque. Note that the bahaviour of
the system in steady state is correct and the simulation results are similar to the
experimental ones.
The second part of graphs (Fig. 7.12-Fig. 7.20) corresponds to the system with
estimated speed taken to the feedback and coordinate transformation. These results
confirm the good behaviour of neural network speed estimator.
Figure 7.3 Steady state for the induction motor controlled via FOC with the encoder
speed signal taken to feedback and transformation ( ω m = 0.1p.
u ; m L = 0 p.
u ).
Experimental and simulation results:
1) estimated speed, 2) stator phase current, 3) rotor flux component,
4) electromagnetic torque.
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