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Abstract
This thesis presents the DTC concept & principles and studies
the dynamic behavior of a direct torque controlled three-phase
induction motor based on a simulation of the mathematical
model of the motor along with the inverter circuit and the
representation of the DTC main blocks in such a simple way.
For purpose of enhancing the DTC system, a suggested fuzzy
logic DTC is introduced. The simulation results of the FL- DTC
have already shown a significant torque ripple reduction.
This thesis also illustrates how the DTC can become a base for
speed control. A conventional (fixed gain) proportional plus
integral (PI) controller is used for closing the speed control loop.
The effect of changing the proportional gain, in the PI controller
is investigated. This has led to the introduction of a FL-PI
controller. The simulation results of the FL-PI controller show a
better speed dynamic response. Finally, the switching ability
between torque control & speed control is introduced and
illustrated by an explanatory example.