الفهرس Only 14 pages are availabe for public view
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Abstract
A phase-difference angle (PDA) controlled pulse width-modulated (PWM) inverter Instead of phase voltage modulation and/or frequency changing Is proposed to control the speed, and posItion of a two-phase induction motor. Several characteristics of a two-phase induction motor driven by the PDA ineverter are studied to verify the improvement of the motor performances. Also, speed, and position tracking are achieved using the proposed control technique.
A simple PDA inverter circuit is proposed for driving symmetrical and unsymmetrical two-phase induction motors. The inverter provides two-phase independently controlled frequency, voltages and PDA of the primary and auxiliary windings of an Induction motor. The dynamic model of two-phase induction motor driven by a PDA inverter expressed in stationary reference frame Is established.
This thesis covers In more details the main principles characteristics of the two-phase induction motor especially at voltage, frequency, PDA changing. The difference among them is studied carefully to reach the best control method.
For unbalanced operation of the two-phase induction motor when used either as a servomotor or single-phase applications. The method of symmetrical components transformation Is used to simplify the steady state analysis of the machine.
The linear model of the machine Is established, and a new controller called polynomial proportional-integral (PPI) controller is derived and used to improve the performance of the machine.
An experimental prototype, which consists of a PC computer based controller, a PDA inverter, and two phase induction motor Is used to verify the validity of the proposed control technique.
Both computer simulation and experimental are performed to show the effectiveness of changing PDA to achieve higher performance in speed and position control compared to other methods of control.