الفهرس 
Chapter I : IntroductionOnly 14 pages are availabe for public view
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Abstract
In recent years the industrial application areas of the high performance AC drives
based on Direct Torque Controller (DTC) technique have gradually increased due to its
advantages over the field oriented control technique.
The main objectives of this thesis are to design and implement of a Microcontroller-based
Permanent Magnet Synchronous Motor (PMSM) drive. The linear model obtained from
application of DTC principle represents the base of the speed control system implemented using
a medium performance Microcontroller to solve some problems associated with PMSM. The
control algorithms, software programs and required hardware systems are included.
A DTC drive system, which is based on a hysteresis bands for both torque and flux
controllers to provide the performance of the system. Therefore, there will be minimizing
torque ripples and minimize distorted waveforms in currents and fluxes.
This thesis introduces a DTC that is expected to improve the dynamic performance.
The study will cover the possible ways to overcome disadvantages of the conventional control
methods. This DTC system is firstly designed and proved by means of simulations. The
complete dynamic model of the drive system and its dynamic performance is investigated
using MATLAB-SMULINK software package is given, together with the simulation results in
different operating cases. Implementation of an actual drive system based on the suggested
DTC including software and hardware, to validate its performance practically is presented.
The suggested control strategy guarantees very good dynamic and steady state characteristics
with low sampling rate and constant switching frequency. The practical and simulation results
show that the use DTC gives good dynamic performance and good tracking response, and they,
also indicates the superiority of the suggested system over the conventional control methods.
Such type of drives is an economical and low cost solution by using a single chip low cost
microcontroller and efficient for present variable speed drives.