4

4.2 SIMULATION RESULTS:
Table 4.1 simulated data for torque error experiment.
TORQUE ERROR (Nm) WITHDIRECT TORQUE CONTROL TORQUE ERROR (Nm) WITH FUZZY TIME (S)
0 0 0
0.2 0.025 1
0.15 0.018 2
0.16 0.02 3
0.15 0.0195 4
0.15 0.0195 10

Figure 4.1 Simulated result for torque error using DTC and fuzzy logic with duty ratio.
In the analysis, the data in the table abovewere used. The torque response of the motor using conventional DTC and fuzzy logic with duty ratio control respectively for a step torque command of 0.15Nm with the drive output updated at a rate of 5kHz were used. The flux ripple generated was 0.05wbapproximately (0.2-0.15)N-m maximum and minimum values

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respectively with the conventional DTC while with fuzzy logic with duty ratio control, the ripple was reduced further to 0.0055Nm approximately (0.025-0.00195)Nm maximum and minimum values respectively, neglecting the under shoot in the torque value at the beginning of each voltage vector.
Table 4.2 Simulated data for flux linkage error experiment
ERROR IN FLUX LINKAGE (Wb) WITH DTC ERROR IN FLUX LINKAGE (Wb) WITH FUZZY TIME
0 0 0
18 2.4 1
12 1.5 2
14 1.7 3
13.33 1.733 4
13.33 1.733 10

Figure 4.2 Simulated result for flux linkage error using DTC and fuzzy logic with duty ratio.
In the analysis, the data in table abovewere used. The flux response of the motor using conventional DTC and fuzzy logic with duty ratio control respectively for a step torque command of 2.4Wb with the drive output updated at a rate of 5kHz were used, the flux ripple generated was 4.67Wb approximately (18-13.33)Wb maximum and minimum values respectively with the conventional DTC while fuzzy logic with duty ratio control the ripple is reduced to 0.667Wb approximately (2.4-1.733)Wbmaximum and minimum values respectively, neglecting the under shoot in the flux value at the beginning of each voltage sector.
Table 4.3 Simulated data for position of the stator flux linkage space vector experiment.
ERROR IN THE POSITION OF FLUX LINKAGE WITH DTC ERROR IN THE POSITION OF FLUX LINKAGE WITH FUZZY TIME
0 0 0
3.3 0.9 1
2.2 0.06 2
2.5 0.07 3
2.45 0.0643 4
2.45 0.0643 10

Figure 43 Simulated result for position of stator flux linkage space vector using DTC and fuzzy logic with duty ratio.
In the analysis, the data in the table above were used. The position of the stator flux linkage space vector response of the motor using conventional DTC and fuzzy logic with duty ratio control respectively for a step angular command of 3.3 degree with the drive output updated at a rate of 5kHz were used, the position of the flux linkage space vector ripple was reduced to 0.85degree approximately (3.3-2.45)degreemaximum and minimum values respectively with the conventional DTC while fuzzy logic with duty ratio control the ripple wasreduced to 0.857 degree approximately (0.9-0.0643)degree maximum and minimum values respectively, neglecting the under shoot in the flux value at the beginning of each voltage sector.

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