Date of Publication :19th October 2023

Abstract: This paper presents a sensorless speed control technique for Brushless DC (BLDC) motors using back electromotive force (B-EMF) method. Traditional speed control methods for BLDC motors rely on position sensors, adding complexity and cost to the system. The proposed sensor less approach leverages the B-EMF signal which is generated by the motor to estimate rotor position and control the motor speed without need for additional sensors. The methodology involves acquiring the back EMF signal, processing it using signal processing techniques and implementing a suitable control algorithm. A controller-based platform is utilized for signal acquisition, processing, and generating control signals. The advantages of this sensor less speed control method include cost reduction, enhanced reliability and simplified design. Obtained results shows the effectiveness of proposed method, showcasing accurate speed control without use of the position sensors. This paper contributes in developing the sensor less control method of BLDC motors speed and opens avenues for further exploration in motor control applications.

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