• P-ISSN 0974-6846 E-ISSN 0974-5645

Indian Journal of Science and Technology

Article

Indian Journal of Science and Technology

Year: 2015, Volume: 8, Issue: 32, Pages: 1-5

Original Article

Sensorless Control of Brushless DC Motor using Modified back-EMF Detection

Abstract

This paper proposes a modified Back-EMF Detection sensorless control scheme for Brushless DC motor drive system. Even though several methods are available for sensorless control, they are found to be unsuitable for closed loop systems controlled by Pulse Width Modulation (PWM) technique. The proposed is well suited for the systems controlled by pulse width modulation technique and can be easily realized through inexpensive PIC microcontrollers. The simulink model of the proposed system is developed using MATLAB to investigate the performance of the proposed sensorless control technique. In the proposed method, a speed dependent time delay unit is developed to produce virtual hall sensor signals. Simulation results are presented to validate the performance of the proposed sensorless control scheme for different reference speeds and load torques.
Keywords: Back-EMF Detection, Brushless DC Motor, MATLAB/Simulink, Speed Dependent Time Delay

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