الفهرس 
الملخص العربي
GeneralOnly 14 pages are availabe for public view
 |  | from | 116 |  |  |
| | | from | 116 | | |
Abstract
This study presents a new method for the speed control of repulsion motors. The control strnlegy is based on a chopper fed motor control. The chopper is fired by one of the following methods:
1) Phase angle firing.
2) Integial cycle firing.
3) Modulated phase angle firing.
In the first method, the mathematical model of the chopper fed repulsion motor with phase angle control is introduced. Also, the experimental set-up and the motor performances are given. Furthermore, the harmonic analysis of the stator voltage and sinior are derived.
In the second technique, the model of the repulsion motor fed from a chopper controlled by integral cycle firing is given. The motor model in this case is analyzed theoretically. Also, the experimental vertifications has been carried out. Power factor calculation and harmonic analysis are also given.
In the third method the motor model has been analyzed, then the theoretically obtained results are verified experimentally. Comparisons with conventional control methods of speed control are given. Harmonic analysis of the motor current and voltage waveforms is also derived using adaptive methods. The harmonic analysis enables the calculation of power factors for different loading conditions.
The proposed methods yields a great improvements in both power factor and commucation of the repulsion motors.