Harsh environment with very low harmonics distortion

Dissertant

Hamad, Karim A.

University

University of Technology

Faculty

-

Department

Department of Electrical Engineering

University Country

Iraq

Degree

Ph.D.

Degree Date

2004

English Abstract

The design and implementation of a new speed control system for three - phase squirrel - cage induction motor are presented in this research.

The system uses a microcontroller for inverter control, and this : speed controller is designed by employing an IGBT- type power electronic switch.

The IGBTs are controlled by pulses based on sinusoidal pulse width modulation (SPWM) technique which satisfies the main requirement of wide range, variable-speed control at which the magnitude and frequency of the control voltage applied to the stator windings, be dependency variable.

This allows the torque-speed characteristics of the induction motor to match most required characteristics.

The PWM are generated by comparing a reference sine wave with carrier triangular wave.

The first wave is obtained from an output filter, designed to convert a square wave reference signal into sine wave signal.

The square wave reference signal is obtained from the microcontroller through specially designed program ; this program also checks the system state initially then generates three phase reference waves possessing frequency control ability.

Additional designed circuits are to assist this control operation in second wave is obtained by an external oscillator with a frequency of 13.2KH2, the high range of carrier frequency is used to eliminate low order harmonics, torque pulsation.

And ensure reliable control operation.

Main Subjects

Electronic engineering

Topics

• Computing

• APA
• MLA
• AMA

Language

English

Data Type

Arab Theses

Record ID

BIM-305839