الفهرس يوجد فقط 14 صفحة متاحة للعرض العام
 |  | from | 108 |  |  |
| | | from | 108 | | |
المستخلص
The switched reluctance motor (SRM) has been paid a great attention as one of the most recent types of electric motors, which combines the dc series motors in a rigid brushless configuration. Among all types of SRMs, a substantial investigation has been paid to the three-phase SRM. That is because it has the minimum number of phases required for inherent self-starting and also combines all features of simplicity of both the motor construction and its corresponding power converter. Some recent studies have been introduced alternative design configuration for this motor attempting to reduce its inherent drawbacks such as torque pulsations and acoustic noise. However, the interactions of these designs on the developed torque and torque per ampere ratio of the machine have been overlooked and needs more investigation
The primary objective of the present thesis is to carry-out an analytical and experimental comparative study for three different configurations of three-phase SRM. These configuration are the 6/4 doubly-salient structure of two poles per phase, the 12/8 doubly-salient structure of four poles per phase and the singly-salient structure of fully-pitched distributed winding. A common frame size and similar number of urns per phase are considered for the three different motor configuration. This comparison is based on a two-dimension finite element numerical solution for the nagnetic circuit of the different motor design structures. The second objective of the present hesis is establish the switching parameters for the excitation pulses, which naximize the developed torque per ampere. The excitation pulses are specified in their uty ratio and trigger angle with respect to phase inductance waveform