• MEGHA BHANGURE
• NAGABHUSHAN PATIL

This thesis focuses on an improved control scheme for a sensorless speed control technique of brushless DC motor (BLDC) by estimating speed from the hall sensor signals. Initially, speed is determined using precision speed encoders which cost almost entire half of drive system. In closed loop control system , state of the output directly affects the input condition. The conventional speed and current controllers are pi controllers, which obtain gains via a trial and error approach or extensive studies. Hence control parameters for the optimal performance at a given operating point may not be effective at a different operating point. paper proposed focus for a low cost speed estimation technique for closed loop control of bldc motor drive based on adaptive pi controller, which can self adjust the control gains. In the simulation, the adaptive pi control shows consistent excellence under various operating conditions such as different initial torque and speed levels. The proposed system is designed, modelled and performance of system is simulated in matlab/simulink and is analysed for different speed and torque references.

Brushless DC Motor (BLDC); speed estimation; hall sensors; current controlled PWM; inverter

"CLOSED LOOP SPEED CONTROL TECHNIQUE FOR BRUSHLESS DC MOTOR DRIVE", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.5, Issue 7, page no.373-379, July-2018, Available :http://www.jetir.org/papers/JETIR1807774.pdf

"CLOSED LOOP SPEED CONTROL TECHNIQUE FOR BRUSHLESS DC MOTOR DRIVE", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.5, Issue 7, page no. pp373-379, July-2018, Available at : http://www.jetir.org/papers/JETIR1807774.pdf