From the simulation results shown in the Figs. 19 to 30, it is observed that the stator current does not exhibit any overshoots nor undershoots. The response of the flux, slip, torque, terminal voltage, speed, currents, etc. takes lesser time to settle & reach the desired value compared to the results presented in [3], [4], [5].
Fig. 15 : ANFIS editor : Training the rules using backpropagation algorithm
Fig. 16 : Surface plot of the 3 parameters (2 inputs : change in error, speed error & 1 output)
Fig. 17 : Contour plot of the 3 parameters (2 inputs : change in error, speed error & 1 output)
It was observed from the simulation results that by using the neuro-fuzzy (ANFIS) control, for the set speed of 100 r / s & for the 49 rules, the speed reaches its desired set value at 0.44 seconds. This shows the effectiveness of the designed neurofuzzy controller & the designed neuro-fuzzy controller tries to speed up the performance of the drive, thus showing faster dynamism. It is also observed that with the designed neuro-fuzzy controller, the response characteristics curves take less time to settle & reach the final steady state value compared to that in [3],
[4], [5]. The motor speed increases like a linear curve upto the set speed of 955 rpm (100 r / s) in 0.44 secs as shown in Fig. 30.Further, it can also be observed that using the ANFIS control, the system stabilizes in a very less time compared to the other methods because of the training process of the ANN involved & the proper selection of the rule base.
Fig. 18 : ANFIS model structure with 2 inputs & 1 output showing all the 5 layers in the ANN architecture