الفهرس | Only 14 pages are availabe for public view |
Abstract In this thesis, various models of induction motors are presented; such as three-phase model, stationary reference frame model, rotor reference frame model, synchronously-rotating reference frame model, space-phasor model, and stationary reference frame model expressed in per unit. Phase-controlled induction motor is considered with a new method presented to determine the extinction angle of the AC voltage controller analytically. Frequency-controlled induction motor is also considered including its various methods of speed control such as constant (V/f) control, constant slip-speed control, constant air-gap flux control, closed-loop constant (V/f) speed control using PI controller, vector control (field-oriented control), whether it is direct or indirect, and direct torque control. Scalar control, indirect field-oriented control and direct torque control of induction motors using fuzzy-logic controller are investigated. In this thesis, the performance characteristics of the systems presented are obtained using Matlab programming language and Matlab/Simulink software package. |