Design and simulation of controller for sensored brushless DC motor

Abstract

ABSTRACT Brushless dc motor (BLDC) is very popular in wide variety of applications. In comparison to conventional dc motor, the brushless dc motor uses an electronic commutator rather than mechanical commutator, so it is more reliable than the dc motor. A BLDC motor has same torque-speed characteristic as a conventional dc motor even though the principle of operation is more complex. BLDC motors are commonly used in high end white goods (refrigerator, washing machine, dish washer etc.), high end pump applications which require higher reliability and efficiency. Another important and very common application of BLDC motor is fans. This document simulates the open loop control and closed loop control of BLDC motor drive for ceiling fan. In open loop speed regulation is possible by varying applied voltage or regulating duty cycle manually whereas in closed loop speed control is possible using various types of controllers like proportional integral controller, fuzzy logic controller which regulate the duty cycle on receiving an error signal. The aim of this thesis is to investigate and evaluate the performance of permanent magnet brushless dc motor driven by open loop and closed loop control system. The speed control by varying applied voltage in open loop system and by using proportional integral in closed loop system for permanent magnet brushless dc motor are simulated using MATLAB software package. Further, for practical implementation point of view open loop Controller has been designed, implemented for 24 V, 40W brushless dc motor based ceiling fan.