# Pulse Width Modulation Algorithm Using Matlab Project Report

## Introduction to Pulse Width Modulation Algorithm Using Matlab Project:

In present industry the induction motors are mostly used for its simplicity, robustness, low cost, high reliability, and efficiency, less maintenance, due this high performance applications these induction motors are predominantly used in industries, the speed of the induction motors are controlled by stator voltage control or rotor resistance control and frequency control, these are conventional methods resulting overheating, operates at low speeds with less accuracy, this paper addresses a new concept in speed control of induction motor by pulse width modulation control(PWM) technique.

It is most effective method in speed regulation of these asynchronous motors; they various types of pulse width modulation techniques like sinusoidal pulse width modulation, trapezoidal pulse width modulation, triangular, square wave pulse width modulation, in this we use  to generate pulses by carrier signal, in this paper we presented an prototype using MATLAB/SIMULINK is implemented in this paper, MATLAB is an real time work shop by implementing the SIMULINK module we can achieve the real time control parameters neglecting the fiction and wind-age losses .

The better way is to change the frequency for the control of speed in pulse width modulation technique we vary the speed by regulating the number of pulses, these pulses are the integral multiples of the supply frequency, for any electronic circuit we need to provide a regulated dc power supply so in our circuit we use  Insulated Gate Bipolar Transistor (IGBT)  for the conversion of  ac to controlled dc, the output control wave form of pulse width modulation is an stepped sinusoidal wave form which is nearly a sinusoidal wave form that means the speed control of the induction drive is smooth.

By implementing this pulse width modulation we can reduce the undesirable harmonics by using selective harmonic technique,  finally the results from the readings of the TACHOGENERATOR  we observed that the speed of the induction motion is  controlling with respect to the supply frequency.