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 above were used. The torque behavior of the motor using only DTC and fuzzy logic with duty ratio control 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 0.05wb (0.2-0.15)N-m greater and lesser values

with the only DTC while with fuzzy logic with duty ratio control, the ripple was reduced further to 0.0055Nm (0.025-0.00195)Nm greater and lesser value, 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 above were used. The flux behaviour of the motor using only DTC and fuzzy logic with duty ratio control 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 (18-13.33)Wb greater and lesser values with the only DTC while fuzzy logic with duty ratio control the ripple is reduced to 0.667Wb (2.4-1.733)Wb higher and lower 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

Figure 4.2 Simulated result for flux linkage error using DTC and fuzzy logic with duty ratio.

In the analysis, the data in table above were used. The flux behaviour of the motor using only DTC and fuzzy logic with duty ratio control 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 (18-13.33)Wb greater and lesser values with the ordinary DTC while fuzzy logic with duty ratio

Figure 4.2 Simulated result for flux linkage error using DTC and fuzzy logic with duty ratio.

In the analysis, the data in table were used. The flux behavior of the motor using only DTC and fuzzy logic with duty ratio control 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 (18-13.33)Wb greater and lesser values with the only DTC while fuzzy logic with duty ratio control the ripple is reduced to 0.667Wb (2.4-1.733)Wb higher and lower values respectively, assumed under shoot in the flux value at the starting point of each voltage sector were neglected.

Table 4.3 Simulated data for position of the stator flux linkage.

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

Figure 43 Simulated result for position of stator flux linkage using DTC and fuzzy logic with duty ratio.

In the analysis, the data in the table were used. The position where the stator flux linkage of the motor using ordinary 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 where the flux linkage ripple was reduced to 0.85degree (3.3-2.45) greater and lesser values with the ordinary DTC while in fuzzy logic with duty ratio control, the ripple was reduced to 0.857 degree (0.9-0.0643)degree greater and lesser values, assumed the under shoot in the flux value at the starting of each voltage sector. Were neglected.