JEE_V7_N4_RP5 Nimain Charan Nayak Journal on Electrical Engineering 2230 – 7176 7 4 29 33 BLDC Motor, Hysteresis Comparator, Sensorless Control This paper presents the BrushLess Dc (BLDC) motor sensorless control system. The sensorless techniques are based on a hysteresis comparator, and a potential start-up method with a high starting torque which is suggested. The hysteresis comparator is used to compensate for the phase delay of the back-EMFs due to a Low-Pass Filter (LPF) and also prevent multiple output transitions from noise or ripple in the terminal voltages. The rotor position is aligned at standstill for maximum starting torque without an additional sensor and any information of motor parameters. Also, the stator current can be easily adjusted by modulating the pulse width of the switching devices during the alignment. The life time of the motor is improved by using the sensorless technique. April - June 2014 Copyright © 2014 i-manager publications. All rights reserved. i-manager Publications http://www.imanagerpublications.com/Article.aspx?ArticleId=2871